Header Protection for Cryptographically Protected E-mail

Internet-Draft	Cryptographic MIME Header Protection	July 2024
Gillmor, et al.	Expires 25 January 2025	[Page]

Abstract

S/MIME version 3.1 introduced a mechanism to provide end-to-end cryptographic protection of e-mail message headers. However, few implementations generate messages using this mechanism, and several legacy implementations have revealed rendering or security issues when handling such a message.¶

This document updates the S/MIME specification (RFC8551) to offer a different mechanism that provides the same cryptographic protections but with fewer downsides when handled by legacy clients. Furthermore, it offers more explicit usability, privacy, and security guidance for clients when generating or handling e-mail messages with cryptographic protection of message headers.¶

The Header Protection scheme defined here is also applicable to messages with PGP/MIME cryptographic protections.¶

Table 1: hp parameter for Content-Type Header Field
hp Value	Authenticity	Integrity	Confidentiality	Description
`"clear"`	yes	yes	no	This message has been signed by the sender with Header Protection
`"cipher"`	yes	yes	yes	This message has been signed by the sender, with Header Protection, and is encrypted to the recipients

4. Receiving Guidance

An MUA that receives a cryptographically protected e-mail will render it for the user.¶

The receiving MUA will render the message body, a selected subset of Header Fields, and (as described in Section 3 of [I-D.ietf-lamps-e2e-mail-guidance]) provide a summary of the cryptographic properties of the message.¶

Most MUAs only render a subset of Header Fields by default. For example, most MUAs render From, To, Cc, Date, and Subject to the user, but few render Message-Id or Received.¶

An MUA that knows how to handle a message with Header Protection makes the following four changes to its behavior when rendering a message:¶

If the MUA detects that an incoming message has protected Header Fields:¶
- For a Header Field that is present in the protected Header Section, the MUA MUST render the protected value, and ignore any unprotected counterparts that may be present (with a special exception for the From Header Field, see Section 4.4).¶
- For a Header Field that is present only in the unprotected Header Section, the MUA SHOULD NOT render that value. If it does render the value, the MUA SHOULD indicate that the rendered value is unprotected. For an exception to this, see Section 7 for a discussion of some specific Header Fields that are known to be added in transit, and therefore are not expected to have end-to-end cryptographic protections.¶
The MUA SHOULD include information in the message's Cryptographic Summary to indicate the types of protection that applied to each rendered Header Field (if any).¶
If any Legacy Display Elements are present in the body of the message, it does not render them.¶
When replying to a message with confidential Header Fields, the replying MUA avoids leaking into the cleartext of the reply any Header Fields which were confidential in the original. It does this even if its own Header Confidentiality Policy would not have treated those Header Fields as confidential. See Section 6 for more details.¶

Note that an MUA that handles a message with Header Protection does not need to render any new Header Fields that it did not render before.¶

4.1. Identifying that a Message has Header Protection

An incoming message can be identified as having Header Protection using the following test:¶

The Cryptographic Payload has parameter hp set to "clear" or "cipher". See Section 4.6 for rendering guidance.¶

When consuming a message, an MUA MUST ignore the hp parameter to Content-Type when it encounters it anywhere other than the root of the message's Cryptographic Payload.¶

4.2. Extracting Protected and Unprotected ("Outer") Header Fields

When a message is encrypted and it uses Header Protection, an MUA extracts a list of protected Header Fields (names and values), as well as a list of Header Fields that were added by the original message sender in unprotected form to the outside of the message's Cryptographic Envelope.¶

The following algorithm takes a reference message refmsg as input, which is encrypted with Header Protection as described in this document (that is, the Cryptographic Envelope includes a Cryptographic Layer that provides encryption, and the hp parameter for the Content-Type Header Field of the Cryptographic Payload is cipher). It produces as output a pair of lists of (h,v) Header Fields.¶

4.2.1. HeaderSetsFromMessage

Method Signature:¶

HeaderSetsFromMessage(refmsg) → (refouter, refprotected)¶

Procedure:¶

Let refheaders be the list of (h,v) protected Header Fields found in the root of the Cryptographic Payload¶
Let refouter be an empty list of Header Field names and values¶
Let refprotected be an empty list of Header Field names and values¶
For each (h,v) in refheaders:¶
1. If h is HP-Outer:¶
  1. Split v into (h1,v1) on the first colon (:) followed by any amount of whitespace.¶
  2. Append (h1,v1) to refouter¶
2. Else:¶
  1. Append (h,v) to refprotected¶
Return refouter, refprotected¶

Note that this algorithm is independent of the unprotected Header Fields. It derives its output only from the normal Header Fields and the HP-Outer Header Fields, both contained inside the Cryptographic Payload.¶

4.3. Updating the Cryptographic Summary

Regardless of whether a cryptographically protected message has protected Header Fields, the Cryptographic Summary of the message should be modified to indicate what protections the Header Fields have. This field-by-field status is complex and isn't necessarily intended to be presented in full to the user. Rather, it represents the state of the message internally within the MUA, and may be used to influence behavior like replying to the message (see Section 6.1).¶

Each Header Field individually has exactly one of the following protection states:¶

unprotected (has no Header Protection)¶
signed-only (bound into the same validated signature as the enclosing message, but also visible in transit)¶
encrypted-only (only appears within the Cryptographic Payload; the corresponding external Header Field was either removed or obscured)¶
signed-and-encrypted (same as encrypted-only, but additionally is under a validated signature)¶

If the message does not have Header Protection (as determined by Section 4.1), then all of the Header Fields are by definition unprotected.¶

If the message has Header Protection, an MUA SHOULD use the following algorithm to compute the protection state of a protected Header Field (h,v) (that is, an element of refprotected from Section 4.2):¶

4.3.1. HeaderFieldProtection

Method signature:¶

HeaderFieldProtection(msg, h, v) → protection_state¶

Procedure:¶

Let ct be the Content-Type of the root of the Cryptographic Payload of msg.¶
Compute (refouter, refprotected) from HeaderSetsFromMessage(msg).¶
If (h, v) is not in refprotected):¶
1. Abort, v is not a valid value for header h¶
Let is_sig_valid be false¶
If the message is signed:¶
1. Let is_sig_valid be the result of validating the signature¶
If the message is encrypted, and if ct has a parameter hp="cipher", and if (h,v) is not in refouter:¶
1. Return signed-and-encrypted if is_sig_valid otherwise encrypted-only¶
Return signed-only if is_sig_valid otherwise unprotected¶

Note that:¶

This algorithm is independent of the unprotected Header Fields. It derives the protection state only from (h,v) and the set of HP-Outer Header Fields, both of which are inside the Cryptographic Envelope.¶
If the signature fails validation, the MUA lowers the affected state to unprotected or encrypted-only without warning the user, as specified by Section 3.1 of [I-D.ietf-lamps-e2e-mail-guidance].¶
Data from signed-and-encrypted and encrypted-only Header Fields may still not be fully private (see Section 11.2).¶
Encryption may have been added in transit to an originally signed-only message. Thus only consider Header Fields to be confidential if the sender indicates it with the hp="cipher" parameter.¶
The protection state of a Header Field may be weaker than that of the message body. For example, a message body can be signed-and-encrypted, but a Header Field that is copied unmodified to the unprotected Header Section is signed-only.¶

If the message has Header Protection, Header Fields that are not in refprotected (e.g., because they were added in transit), are unprotected.¶

Rendering the cryptographic status of each Header Field is likely to be complex and messy --- users may not understand it. It is beyond the scope of this document to suggest any specific graphical affordances or user experience. Future work should include examples of successful rendering of this information.¶

4.4. Handling the Protected From Header Field

End-to-end (MUA-to-MUA) Header Protection is good for authenticity, ingtegrity, and confidentiality, but it potentially introduces new issues when an MUA depends on its MTA to authenticate any Header Field. In particular, when an MUA depends in its MTA to ensure that the From e-mail address is authentic, but the MUA renders a protected From e-mail address that differs from the address visible to the MTA, this could create a risk of sender address spoofing (see Section 10.1).¶

An MUA MUST render the protected From Header Field if the addr-spec of the protected From matches the addr-spec of the unprotected From (see Section 4.4.1). (Note that the unprotected From Header Field used in this comparison is the actual outer Header Field (as seen by the MTA), not the value indicated by any potential inner HP-Outer.)¶

Otherwise, an MUA SHOULD render the protected From Header Field if:¶

The message has a valid signature, and¶
the signature is made by a certificate for which the MUA has a valid binding to the protected From address (see Section 4.4.1)¶

There are many possible ways that an MUA could choose to validate a certificate-to-address binding. For example, the MUA could ensure the certificate is issued by one of a set of trusted certification authorities, it could rely on the user to do a manual out-of-band comparison, it could rely on a DNSSEC signal ([RFC7929] or [RFC8162]), and so on. It is beyond the scope of this document to describe all possible ways an MUA might validate the certificate-to-address binding, or to choose among them.¶

Otherwise (that is, when the addr-specs don't match and there is no valid signature from a certificate valid for the protected From), an MUA SHOULD render the unprotected From Header Field. Note that these conditions reflect the idea of end-to-end, MUA-to-MUA protections. Only if the MUA has a validated certificate for the sender's address, and the message has a valid signature from that certificate, is there MUA-to-MUA authenticity. In all other cases (having a not-fully-trusted certificate, or the signature failing to validate, or no signature being present) we cannot have MUA-to-MUA authenticity. Therefore, in these cases we fall back to the outer unprotected From header (to avoid introducing new ways to do sender address spoofing).¶

In these failure cases of missing or invalid signature and mismatched From addresses, the MUA MAY also warn the user.¶

This safety measure needs to be applied to signed-only messages as well as signed-and-encrypted messages.¶

4.4.1. Matching addr-specs for Safe Handling of the From Header Field

When generating (Section 3.1.1) or consuming (Section 4.4) a protected From Header Field, the MUA considers the equivalence of two different addr-spec values.¶

First, the MUA MUST compare the domain part of the two addr-specs by standard DNS comparison: assume ASCII text, and compare alphabetic characters case-insensitively, as described in Section 3.1 of [RFC1035]. If the domain parts match, then the two local-parts are matched against each other. The simplest and most common comparison for the local-part is also an ASCII-based, case-insensitive match. If the MUA has special knowledge about the domain and, when composing, it can reasonably expect the receiving MUAs to have the same information, it MAY match the local-part using a more sophisticated and inclusive matching algorithm.¶

It is beyond the scope of this document to recommend a more sophisticated and inclusive matching algorithm.¶

4.5. Header Confidentiality for Referenced Encrypted Messages (Replies, Forwarding)

An MUA might create a new message in response to another message. For example, the user of an MUA viewing any given message might take an action like "Reply", "Reply All", "Forward", or some comparable action to start the composition of a new message. The new message created this way effectively references the original message that was viewed at the time.¶

When the referenced message was itself encrypted with Header Protection, and some of its Header Fields had been obscured or removed, the replying MUA needs to make sure that the new message does not leak previously confidential header material. This section describes a method to produce a list of Header Fields that should be obscured or removed in the new message even if the sender's choice of Header Confidentiality Policy wouldn't normally remove or obscure the Header Field in question.¶

It takes two items as input:¶

A single referenced message refmsg, and¶
A built-in MUA function respond associated with the user's action. respond takes as input a list of headers from a referenced message and generates a list of initial candidate message Header Field names and values that are used to populate the message composition interface. Something like this function already exists in most MUAs, though it may differ across responsive actions. For example, the respond function that implements "Reply All" is likely to be a different from the respond that implements "Reply".¶

As output, we produce an ephemeral single-use Header Confidentiality Policy, specific to this kind of response to this specific message.¶

4.5.1. ReferenceHCP

Method signature:¶

ReferenceHCP(refmsg, respond) → ephemeral_hcp¶

Procedure:¶

If refmsg is not encrypted with Header Protection:¶
1. Return hcp_no_confidentiality (there is no header confidentiality in the reference message that needs protection)¶
Extract refouter, refprotected from refmsg as described in Section 4.2 ¶
Let genprotected be a list of (h,v) pairs generated by respond(refprotected)¶
Let genouter be a list of (h,v) pairs generated by respond(refouter)¶
For each (h,v) in genprotected:¶
1. If (h,v) is in genouter:¶
  1. Remove (h,v) from both genprotected and genouter (this Header Field does not need additional confidentiality)¶
Let confmap be a mapping from a Header Field name and value (h,v) to either a string or the special value null (this mapping is initially empty)¶
For each (h,v) remaining in genprotected:¶
1. Set result to the special value null¶
2. For each (h1,v1) in genouter:¶
  1. If h1 is h:¶
    1. Set result to v1¶
3. Insert (h,v) -> result into confmap¶
Return a new HCP from confmap that tests whether (name,val_in) are in confmap; if so, return confmap[(name,val_in)]; otherwise, return val_in¶

Note that the key idea here is to reuse the MUA's existing respond function. The algorithm simulates how the MUA would pre-populate a reply to two traditional messages whose Header Fields have the values refouter and refprotected respectively (independent of any cryptographic protections). Then it uses the difference to derive a one-time HCP. This HCP takes into account both the referenced message's sender's preferences and the derivations that can happen to Header Field values when responding. Note that while some of these derivations are straight forward (e.g., In-Reply-To is usually derived from Message-ID), others are non-trivial. For example, From may be derived from To, Cc, or from the MUA's local address preference (especially when the MUA received the referenced message via Bcc). Similarly, To may be derived from To, From, and/or Cc depending on the MUA implementation and depending on whether the user clicked "Reply", "Reply All", "Forward", or any other action that generates a response to a message. Reusing the MUA's existing respond function incorporates these nuances without requiring any extra configuration choices or additional maintenance burden.¶

4.6. Rendering a Message with Header Protection

When the Cryptographic Payload's Content-Type has the parameter hp set to "clear" or "cipher", the values of the protected Header Fields are drawn from the Header Fields of the Cryptographic Payload, and the body that is rendered is the Cryptographic Payload itself.¶

4.6.1. Example Signed-only Message

Consider a message with this structure, where the MUA is able to validate the cryptographic signature:¶

A └─╴application/pkcs7-mime; smime-type="signed-data"
   ⇩ (unwraps to)
B  └┬╴multipart/alternative [Cryptographic Payload + Rendered Body]
C   ├─╴text/plain
D   └─╴text/html

The message body should be rendered the same way as this message:¶

B └┬╴multipart/alternative
C  ├─╴text/plain
D  └─╴text/html

The MUA should render Header Fields taken from part B.¶

Its Cryptographic Summary should indicate that the message was signed and all rendered Header Fields were included in the signature.¶

Because this message is signed-only, none of its parts will have a Legacy Display Element.¶

The MUA should ignore Header Fields from part A for the purposes of rendering.¶

4.6.2. Example Signed-and-Encrypted Message

Consider a message with this structure, where the MUA is able to validate the cryptographic signature:¶

E └─╴application/pkcs7-mime; smime-type="enveloped-data"
   ↧ (decrypts to)
F  └─╴application/pkcs7-mime; smime-type="signed-data"
    ⇩ (unwraps to)
G   └┬╴multipart/alternative [Cryptographic Payload + Rendered Body]
H    ├─╴text/plain
I    └─╴text/html

The message body should be rendered the same way as this message:¶

G └┬╴multipart/alternative
H  ├─╴text/plain
I  └─╴text/html

It should render Header Fields taken from part G.¶

Its Cryptographic Summary should indicate that the message is signed-and-encrypted.¶

When rendering the Cryptographic Status of a Header Field and when composing a reply, each Header Field found in G should be considered against all HP-Outer Header Fields found in G. If an HP-Outer Header Field is found that matches both the name and value, the Header Field's Cryptographic Status is just signed-only, even though the message itself is signed-and-encrypted. If no matching HP-Outer Header Field is found, the Header Field's Cryptographic Status is signed-and-encrypted, like the rest of the message.¶

If any of the User-Facing Header Fields are removed or obscured, the composer of this message may have placed Legacy Display Elements in parts H and I.¶

The MUA should ignore Header Fields from part E for the purposes of rendering.¶

4.6.3. Do Not Render Legacy Display Elements

As described in Section 2.1.2, a message with cryptographic confidentiality protection MAY include Legacy Display Elements for backward-compatibility with Legacy MUAs. These Legacy Display Elements are strictly decorative, unambiguously identifiable, and will be discarded by compliant implementations.¶

The receiving MUA MUST avoid rendering the identified Legacy Display Elements to the user at all, since it is aware of Header Protection and can render the actual protected Header Fields.¶

If a text/html or text/plain part within the Cryptographic Envelope is identified as containing Legacy Display Elements, those elements MUST be hidden when rendering and MUST be dropped when generating a draft reply or inline forwarded message. Whenever a Message or MIME subtree is exported, downloaded, or otherwise further processed, if there is no need to retain a valid cryptographic signature, the implementer MAY drop the Legacy Display Elements.¶

4.6.3.1. Identifying a Part with Legacy Display Elements

A receiving MUA acting on a message that contains an encrypting Cryptographic Layer identifies a MIME subpart within the Cryptographic Payload as containing Legacy Display Elements based on the Content-Type of the subpart. The subpart's Content-Type:¶

contains a parameter hp-legacy-display with value set to 1, and¶
is either text/html (see Section 4.6.3.3) or text/plain (see Section 4.6.3.2).¶

Note that the term "subpart" above is used in the general sense: if the Cryptographic Payload is a single part, that part itself may contain a Legacy Display Element if it is marked with the hp-legacy-display=1 parameter.¶

4.6.3.2. Omitting Legacy Display Elements from text/plain

If a text/plain part within the Cryptographic Payload has the Content-Type parameter hp-legacy-display="1", it should be processed before rendering in the following fashion:¶

Discard the leading lines of the body of the part up to and including the first entirely blank line.¶

Note that implementing this strategy is dependent on the charset used by the MIME part.¶

See Appendix E.1 for an example.¶

4.6.3.3. Omitting Legacy Display Elements from text/html

If a text/html part within the Cryptographic Payload has the Content-Type parameter hp-legacy-display="1", it should be processed before rendering in the following fashion:¶

If any element of the HTML <body> is a <div> with class attribute header-protection-legacy-display, that entire element should be omitted.¶

This cleanup could be done, for example, as a custom rule in the MUA's HTML sanitizer, if one exists. Another implementation strategy for an HTML-capable MUA would be to add an entry to the [CSS] stylesheet for such a part:¶

body div.header-protection-legacy-display { display: none; }

4.7. Implicitly rendered Header Fields

While From, To, Cc, Subject, and Date are often explicitly rendered to the user, some Header Fields do affect message display, without being explicitly rendered.¶

For example, Message-Id, References, and In-Reply-To Header Fields may collectively be used to place a message in a "thread" or series of messages.¶

In another example, Section 6.2 observes that the value of the Reply-To field can influence the draft reply message. So while the user may never see the Reply-To Header Field directly, it is implicitly "rendered" when the user interacts with the message by replying to it.¶

An MUA that depends on any implicitly rendered Header Field in a message with Header Protection MUST use the value from the protected Header Field, and SHOULD NOT use any value found outside the cryptographic protection unless it is known to be a Header Field added in transit, as specified in Section 7.¶

4.8. Handling Undecryptable Messages

An MUA might receive an apparently encrypted message that it cannot currently decrypt. For example, when an MUA does not have regular access to the secret key material needed for decryption, it cannot know the cryptographically protected Header Fields or even whether the message has any cryptographically protected Header Fields.¶

Such an undecrypted message will be rendered by the MUA as a message without any Header Protection. This means that the message summary may well change how it is rendered when the user is finally able to supply the secret key.¶

For example, the rendering of the Subject Header Field in a mailbox summary might change from [...] to the real message subject when the message is decrypted. Or the message's placement in a message thread might change if, say, References or In-Reply-To have been removed or obscured (see Section 4.7).¶

Additionally, if the MUA does not retain access to the decrypting secret key, and it drops the decrypted form of a message, the message's rendering may revert to the encrypted form. For example, if an MUA follows this behavior, the Subject Header Field in a mailbox summary might change from the real message subject back to [...]. Or the message might be displayed outside of its current thread if the MUA loses access to a removed References or In-Reply-To header.¶

These behaviors are likely to surprise the user. However, an MUA has several possible ways of reducing or avoiding all of these surprises, including:¶

Ensuring that the MUA always has access to decryption-capable secret key material.¶
Rendering undecrypted messages in a special quarantine view until the decryption-capable secret key material is available.¶

To reduce or avoid the surprises associated with a decrypted message with removed or obscured Header Fields becoming undecryptable, the MUA could also:¶

Securely cache metadata from a decrypted message's protected Header Fields so that its rendering doesn't change after the first decryption.¶
Securely store the session key associated with a decrypted message, so that attempts to read the message when the long-term secret key are unavailable can proceed using only the session key itself. See, for example, the discussion about stashing session keys in Section 9.1 of [I-D.ietf-lamps-e2e-mail-guidance].¶

4.9. Guidance for Automated Message Handling

Some automated systems have a control channel that is operated by e-mail. For example, an incoming e-mail message could subscribe someone to a mailing list, initiate the purchase of a specific product, approve another message for redistribution, or adjust the state of some shared object.¶

To the extent that such a system depends on end-to-end cryptographic guarantees about the e-mail control message, Header Protection as defined in this document should improve the system's security. This section provides some specific guidance for systems that use e-mail messages as a control channel that want to benefit from these security improvements.¶

4.9.1. Interpret Only Protected Header Fields

Consider the situation where an e-mail-based control channel depends on the message's cryptographic signature and the action taken depends on some Header Field of the message.¶

In this case, the automated system MUST rely on information from the Header Field that is protected by the mechanism defined in this document. It MUST NOT rely on any Header Field found outside the Cryptographic Payload.¶

For example, consider an administrative interface for a mailing list manager that only accepts control messages that are signed by one of its administrators. When an inbound message for the list arrives, it is queued (waiting for administrative approval) and the system generates and listens for two distinct e-mail addresses related to the queued message -- one that approves the message, and one that rejects it. If an administrator sends a signed control message to the approval address, the mailing list verifies that the protected To Header Field of the signed control message contains the approval address before approving the queued message for redistribution. If the protected To Header Field does not contain that address, or there is no protected To Header Field, then the mailing list logs or reports the error and does not act on that control message.¶

4.9.2. Ignore Legacy Display Elements

Consider the situation where an e-mail-based control channel expects to receive an end-to-end encrypted message -- for example, where the control messages need confidentiality guarantees -- and where the action taken depends on the contents of some MIME part within the message body.¶

In this case, the automated system that decrypts the incoming messages and scans the relevant MIME part MUST identify when the MIME part contains a Legacy Display Element (see Section 4.6.3.1), and it MUST parse the relevant MIME part with the Legacy Display Element removed.¶

For example, consider an administrative interface of a confidential issue tracking software. An authorized user can confidentially adjust the status of a tracked issue by a specially formatted first line of the message body (for example, severity #183 serious). When the user's MUA encrypts a plain text control message to this issue tracker, depending on the MUA's HCP and its choice of legacy value, it may add a Legacy Display Element. If it does so, then the first line of the message body will contain a decorative copy of the confidential Subject Header Field. The issue tracking software decrypts the incoming control message, identifies that there is a Legacy Display Element in the part (see Section 4.6.3.1), strips the lines comprising the Legacy Display Element (including the first blank line), and only then parses the remaining top line to look for the expected special formatting.¶

4.10. Affordances for Debugging and Troubleshooting

Note that advanced users of an MUA may need access to the original message, for example to troubleshoot problems with the rendering MUA itself, or problems with the SMTP transport path taken by the message.¶

An MUA that applies these rendering guidelines SHOULD ensure that the full original source of the message as it was received remains available to such a user for debugging and troubleshooting.¶

If a troubleshooting scenario demands information about the cryptographically protected values of Header Fields, and the message is encrypted, the debugging interface SHOULD also provide a "source" view of the Cryptographic Payload itself, alongside the full original source of the message as received.¶

4.11. Rendering Other Schemes

Other MUAs may have generated different structures of messages that aim to offer end-to-end cryptographic protections that include Header Protection. This document is not normative for those schemes, and it is NOT RECOMMENDED to generate these other schemes, as they can either have structural flaws or simply render poorly on Legacy MUAs. A conformant MUA MAY attempt to infer Header Protection when rendering an existing message that appears to use some other scheme not documented here. Pointers to some known other schemes can be found in Appendix F.¶

4.11.1. Handling RFC8551HP Messages

Section 1.1.1 describes some drawbacks to the Header Protection scheme defined in [RFC8551], referred to here as RFC8551HP. An MUA MUST NOT generate an RFC8551HP message, but MAY try to render or respond to such a message as though the message has standard Header Protection.¶

4.11.1.1. Identifying an RFC8551HP Message

An RFC8551HP Message can be identified by its MIME structure, given that all of the following conditions are met:¶

It has a well-formed Cryptographic Envelope consisting of at least one Cryptographic Layer as the outermost MIME object.¶
The Cryptographic Payload is a single message/rfc822 object¶
The message that constitutes the Cryptographic Payload does not itself have a well-formed Cryptographic Envelope; that is, its outermost MIME object is not a Cryptographic Layer.¶
No Content-Type parameter of hp= is set on either the Cryptographic Payload, or its immediate MIME child.¶

Here is the MIME structure of an example signed-and-encrypted RFC8551HP message:¶

A └─╴application/pkcs7-mime; smime-type="enveloped-data"
   ↧ (decrypts to)
B  └─╴application/pkcs7-mime; smime-type="signed-data"
    ⇩ (unwraps to)
C   └┬╴message/rfc822 [Cryptographic Payload]
D    └┬╴multipart/alternative [Rendered Body]
E     ├─╴text/plain
F     └─╴text/html

This meets the definition of an RFC8551HP message because:¶

Cryptographic Layers A and B form the Cryptographic Envelope.¶
The Cryptographic Payload, rooted in part C has Content-Type: message/rfc822.¶
Part D (the MIME root of the message at C) is itself not a Cryptographic Layer.¶
Neither part C nor part D have any hp parameter set on their Content-Type.¶

4.11.1.2. Rendering or Responding to an RFC8551HP message

When it has precisely identified a message as an RFC8551HP message, an MUA MAY render or respond to that message as though it were a message with Header Protection as defined in this document by making the following adjustments:¶

Rather than rendering the message body as the Cryptographic Payload itself (part C in the example above), render the RFC8551HP message's body as the MIME subtree that is the Cryptographic Payload's immediate child (part D).¶
Make a comparable modification to HeaderSetsFromMessage (Section 4.2.1) and HeaderFieldProtection (Section 4.3.1): both algorithms currently look for the protected Header Fields on the Cryptographic Payload (part C), but they should instead look at the Cryptographic Payload's immediate child (part D).¶
If the Cryptographic Envelope is signed-only, behave as though there is an hp="clear" parameter for the Cryptographic Payload; if the Envelope contains encryption, behave as though there is an hp="cipher" parameter. That is, infer the sender's cryptographic intent from the structure of the message.¶
If the Cryptographic Envelope contains encryption, further modify HeaderSetsFromMessage to derive refouter from the actual outer message Header Fields (those found in part A in the example above), rather than looking for HP-Outer Header Fields with the other protected Header Fields. That is, infer Header Field confidentiality based on the unprotected headers.¶

The inferences in the above modifications are not based on any strong end-to-end guarantees. An intervening MTA may tamper with the message's outer Header Section or wrap the message in an encryption layer to undetectably change the recipient's understanding of the confidentiality of the message's Header Fields or the message body itself.¶

Table 2: Additions to 'Permanent Message Header Field Names' registry
Header Field Name	Template	Protocol	Status	Reference
`HP-Outer`		mail	standard	Section 2.2.1 of RFCXXXX

Table 3: Existing row in 'Permanent Message Header Field Names' registry
Header Field Name	Template	Protocol	Status	Reference
`Content-Type`		MIME		[RFC4021]

Table 4: Replacement row in 'Permanent Message Header Field Names' registry
Header Field Name	Template	Protocol	Status	Reference
`Content-Type`		MIME		[RFC4021] [RFCXXXX]

Table 5: Mail Header Confidentiality Policies registry
Header Confidentiality Policy Name	Description	Reference	Recommended
`hcp_no_confidentiality`	No header confidentiality	Section 3.2.3 of RFCXXX (this document)	N
`hcp_baseline`	Confidentiality for Informational Header Fields: `Subject` Header Field is obscured, `Keywords` and `Comments` are removed	Section 3.2.1 of RFCXXX (this document)	Y
`hcp_shy`	Obscure `Subject`, remove `Keywords` and `Comments`, remove the time zone from `Date`, and obscure `display-name`s	Section 3.2.2 of RFCXXX (this document)	N

Table 6: Table of Pseudocode Listings
Method Name	Description	Reference
HeaderSetsFromMessage	Derive "outer" and "protected" sets of Header Fields from a given message	Section 4.2.1
HeaderFieldProtection	Calculate cryptographic protections for a Header Field in a given message	Section 4.3.1
ReferenceHCP	Produce an ephemeral HCP to use when responding to a given message	Section 4.5.1
ComposeNoHeaderProtection	Legacy message composition with end-to-end cryptographic protections (but no header protection)	Section 5.1.1
Compose	Compose a message with end-to-end cryptographic protections including header protection	Section 5.2.1

Appendix C. Test Vectors

This section contains sample messages using the specification defined above. Each sample contains a MIME object, a textual and diagrammatic view of its structure, and examples of how an MUA might render it.¶

The cryptographic protections used in this document use the S/MIME standard, and keying material and certificates come from [RFC9216].¶

These messages should be accessible to any IMAP client at imap://bob@header-protection.cmrg.net/ (any password should authenticate to this read-only IMAP mailbox).¶

You can also download copies of these test vectors separately at https://header-protection.cmrg.net.¶

If any of the messages downloaded differ from those offered here, this document is the canonical source.¶

C.1. Baseline Messages

These messages offer no header protection at all, and can be used as a baseline. They are provided in this document as a counterexample. An MUA implementer can use these messages to verify that the reported cryptographic summary of the message indicates no header protection.¶

C.1.1. No Cryptographic Protections Over a Simple Message

This message uses no cryptographic protection at all. Its body is a text/plain message.¶

It has the following structure:¶

└─╴text/plain 152 bytes

Its contents are:¶

MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
Subject: no-crypto
Message-ID: <no-crypto@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:00:02 -0500
User-Agent: Sample MUA Version 1.0

This is the
no-crypto
message.

This message uses no cryptographic protection at all.  Its body
is a text/plain message.

--
Alice
alice@smime.example

C.1.2. S/MIME Signed-only signedData Over a Simple Message, No Header Protection

This is a signed-only S/MIME message via PKCS#7 signedData. The payload is a text/plain message. It uses no header protection.¶

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 3856 bytes
 ⇩ (unwraps to)
 └─╴text/plain 206 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"
Subject: smime-one-part
Message-ID: <smime-one-part@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:01:02 -0500
User-Agent: Sample MUA Version 1.0
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bqYT1i46156CSOqyxA==

C.1.2.1. S/MIME Signed-only signedData Over a Simple Message, No Header Protection, Unwrapped

The S/MIME signed-data layer unwraps to:¶

MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit

This is the
smime-one-part
message.

This is a signed-only S/MIME message via PKCS#7 signedData.  The
payload is a text/plain message. It uses no header protection.

--
Alice
alice@smime.example

C.1.3. S/MIME Signed-only multipart/signed Over a Simple Message, No Header Protection

This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a text/plain message. It uses no header protection.¶

It has the following structure:¶

└┬╴multipart/signed 4187 bytes
 ├─╴text/plain 224 bytes
 └─╴application/pkcs7-signature [smime.p7s] 3429 bytes

Its contents are:¶

MIME-Version: 1.0
Content-Type: multipart/signed;
 protocol="application/pkcs7-signature"; boundary="253";
 micalg="sha-256"
Subject: smime-multipart
Message-ID: <smime-multipart@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:02:02 -0500
User-Agent: Sample MUA Version 1.0

--253
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit

This is the
smime-multipart
message.

This is a signed-only S/MIME message via PKCS#7 detached
signature (multipart/signed).  The payload is a text/plain
message. It uses no header protection.

--
Alice
alice@smime.example

--253
Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-signature; name="smime.p7s"
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Gdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXC
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CCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj
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hvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4F
zkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMt
jH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZR
zWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8
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ETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENl
cnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3
MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUG
A1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK
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2LYdIHPLmq8KGrzcgjkjP+Y58hf9U+6gp0KPuS8DAGOvxYs0

--253--

C.1.4. S/MIME Signed and Encrypted Over a Simple Message, No Header Protection

This is a signed-and-encrypted S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses no header protection.¶

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 6720 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 3960 bytes
  ⇩ (unwraps to)
  └─╴text/plain 241 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: smime-signed-enc
Message-ID: <smime-signed-enc@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:03:02 -0500
User-Agent: Sample MUA Version 1.0

MIITXAYJKoZIhvcNAQcDoIITTTCCE0kCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV
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tvuGXDdfN2Hu5Yfnu6CdTqrovkbEzYt2kEzCXKvNZGcp58Nhbybt6Pw4Iju5XsA+
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TDPgBaI8twdD5UfxnlglmM88304Rt4JsraLb3YtX8SD2p0g4GFfkEVKMJXYjWz6M
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1OtoJc+0XZ617xSFoKWnyA==

C.1.4.1. S/MIME Signed and Encrypted Over a Simple Message, No Header Protection, Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"
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eBAuDLsatbtKtl4FzkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLv
Lir3hEUV2Z3MRsMtjH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLro
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WHUz1F00juyuOfQsqm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIIC
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MBaAFJEwjnwHFwyn8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2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C.1.4.2. S/MIME Signed and Encrypted Over a Simple Message, No Header Protection, Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit

This is the
smime-signed-enc
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a text/plain
message. It uses no header protection.

--
Alice
alice@smime.example

C.1.5. No Cryptographic Protections Over a Complex Message

This message uses no cryptographic protection at all. Its body is a multipart/alternative message with an inline image/png attachment.¶

It has the following structure:¶

└┬╴multipart/mixed 1402 bytes
 ├┬╴multipart/alternative 794 bytes
 │├─╴text/plain 206 bytes
 │└─╴text/html 304 bytes
 └─╴image/png inline 232 bytes

Its contents are:¶

MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="e68"
Subject: no-crypto-complex
Message-ID: <no-crypto-complex@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:00:02 -0500
User-Agent: Sample MUA Version 1.0

--e68
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="f70"

--f70
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

This is the
no-crypto-complex
message.

This message uses no cryptographic protection at all.  Its body
is a multipart/alternative message with an inline image/png
attachment.

--
Alice
alice@smime.example
--f70
Content-Type: text/html; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

<html><head><title></title></head><body>
<p>This is the
<b>no-crypto-complex</b>
message.</p>
<p>This message uses no cryptographic protection at all.  Its body
is a multipart/alternative message with an inline image/png
attachment.</p>
<p><tt>-- <br/>Alice<br/>alice@smime.example</tt></p></body></html>
--f70--

--e68
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: inline

iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA
MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ
sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli
vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg==

--e68--

C.1.6. S/MIME Signed-only signedData Over a Complex Message, No Header Protection

This is a signed-only S/MIME message via PKCS#7 signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses no header protection.¶

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 5253 bytes
 ⇩ (unwraps to)
 └┬╴multipart/mixed 1288 bytes
  ├┬╴multipart/alternative 882 bytes
  │├─╴text/plain 260 bytes
  │└─╴text/html 355 bytes
  └─╴image/png inline 236 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"
Subject: smime-one-part-complex
Message-ID: <smime-one-part-complex@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:01:02 -0500
User-Agent: Sample MUA Version 1.0

MIIPIwYJKoZIhvcNAQcCoIIPFDCCDxACAQExDTALBglghkgBZQMEAgEwggVMBgkq
hkiG9w0BBwGgggU9BIIFOU1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6
IG11bHRpcGFydC9taXhlZDsgYm91bmRhcnk9IjUzMyINCg0KLS01MzMNCk1JTUUt
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bGFpbjsgY2hhcnNldD0idXMtYXNjaWkiDQpNSU1FLVZlcnNpb246IDEuMA0KQ29u
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bWUtb25lLXBhcnQtY29tcGxleA0KbWVzc2FnZS4NCg0KVGhpcyBpcyBhIHNpZ25l
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DQYJKoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMg
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yrZlRAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HV
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S9MtDUy34GTkdUQ7OXFlLa5kpQfUFBbQ5qflKUvIrBsYX6qjWAVs

C.1.6.1. S/MIME Signed-only signedData Over a Complex Message, No Header Protection, Unwrapped

The S/MIME signed-data layer unwraps to:¶

MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="533"

--533
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="931"

--931
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

This is the
smime-one-part-complex
message.

This is a signed-only S/MIME message via PKCS#7 signedData.  The
payload is a multipart/alternative message with an inline
image/png attachment. It uses no header protection.

--
Alice
alice@smime.example
--931
Content-Type: text/html; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

<html><head><title></title></head><body>
<p>This is the
<b>smime-one-part-complex</b>
message.</p>
<p>This is a signed-only S/MIME message via PKCS#7 signedData.  The
payload is a multipart/alternative message with an inline
image/png attachment. It uses no header protection.</p>
<p><tt>-- <br/>Alice<br/>alice@smime.example</tt></p></body></html>
--931--

--533
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: inline

iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA
MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ
sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli
vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg==

--533--

C.1.7. S/MIME Signed-only multipart/signed Over a Complex Message, No Header Protection

This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a multipart/alternative message with an inline image/png attachment. It uses no header protection.¶

It has the following structure:¶

└┬╴multipart/signed 5230 bytes
 ├┬╴multipart/mixed 1344 bytes
 │├┬╴multipart/alternative 938 bytes
 ││├─╴text/plain 278 bytes
 ││└─╴text/html 376 bytes
 │└─╴image/png inline 232 bytes
 └─╴application/pkcs7-signature [smime.p7s] 3429 bytes

Its contents are:¶

MIME-Version: 1.0
Content-Type: multipart/signed;
 protocol="application/pkcs7-signature"; boundary="4e5";
 micalg="sha-256"
Subject: smime-multipart-complex
Message-ID: <smime-multipart-complex@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:02:02 -0500
User-Agent: Sample MUA Version 1.0

--4e5
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="0be"

--0be
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="cb6"

--cb6
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

This is the
smime-multipart-complex
message.

This is a signed-only S/MIME message via PKCS#7 detached
signature (multipart/signed).  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses no header protection.

--
Alice
alice@smime.example
--cb6
Content-Type: text/html; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

<html><head><title></title></head><body>
<p>This is the
<b>smime-multipart-complex</b>
message.</p>
<p>This is a signed-only S/MIME message via PKCS#7 detached
signature (multipart/signed).  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses no header protection.</p>
<p><tt>-- <br/>Alice<br/>alice@smime.example</tt></p></body></html>
--cb6--

--0be
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: inline

iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA
MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ
sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli
vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg==

--0be--

--4e5
Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-signature; name="smime.p7s"

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6NdLvgw4mZmSSiOyOlfKo3cgo4rZuN6CeLCgqZ0GjIJS43v+

--4e5--

C.1.8. S/MIME Signed and Encrypted Over a Complex Message, No Header Protection

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 8710 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 5434 bytes
  ⇩ (unwraps to)
  └┬╴multipart/mixed 1356 bytes
   ├┬╴multipart/alternative 950 bytes
   │├─╴text/plain 295 bytes
   │└─╴text/html 390 bytes
   └─╴image/png inline 236 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: smime-signed-enc-complex
Message-ID: <smime-signed-enc-complex@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:03:02 -0500
User-Agent: Sample MUA Version 1.0

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C.1.8.1. S/MIME Signed and Encrypted Over a Complex Message, No Header Protection, Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

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So27PmhKE1oAJKKhDbdbEcZXL2+x1V+duGymWtaD01DZZukKYr7agyHahiXRn/C9
cy31wbqNsy9x0fjPQg6+DqatiQpMz9EIae6aCHHBhOiPU7IPkazgPYgkLD59fk4P
GHnYxs1FhdO6zZk9E8zwlc1ALgZa/iSbczisqckN3qGehD2s16jMhwFXLJtBiN+u
CDgNG/D0qyTbY4fgKieUHx/tHuzUszZxJjGCAgAwggH8AgEBMGwwVTENMAsGA1UE
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YbD1RRyrYjMaj8vm0wJceMeGDm9qv/JsQlgwDQYJKoZIhvcNAQEBBQAEggEAbtxK
BK0ie88UC9KGR0/nHIWpXJOnN1/tXtEWsLoypwYiw8XKgcN8zgZ06RikcGX12ijW
Gz2wgA2yIRfnzWBvS6zmBc9r37klP8uhB0GgPrPFTtq+GeLn9hUApYQTb20HlSKM
e34oCU7qv0lYFfN0sDlwxkha1X3AAg4QFcUrnLJRkYFWDH6XvxsHNiLznwsF/+B1
uNiPIi7rhKgG3oLYu4H8qGolM5H+gyl7+h4t8hUHZVTxZ6QyTO0K+D2JO8aazcor
PgJsa85BUfcx0JXsixcqtLzTAfsPOAQBl1CUHEied1qX6nlMb2gCxP6psFEXPRGM
rxSLzwv5QtKJCaDfYw==

C.1.8.2. S/MIME Signed and Encrypted Over a Complex Message, No Header Protection, Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="508"

--508
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="804"

--804
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

This is the
smime-signed-enc-complex
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses no header protection.

--
Alice
alice@smime.example
--804
Content-Type: text/html; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

<html><head><title></title></head><body>
<p>This is the
<b>smime-signed-enc-complex</b>
message.</p>
<p>This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses no header protection.</p>
<p><tt>-- <br/>Alice<br/>alice@smime.example</tt></p></body></html>
--804--

--508
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: inline

iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA
MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ
sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli
vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg==

--508--

C.2. Signed-only Messages

These messages are signed-only, using different schemes of header protection and different S/MIME structure. The use no Header Confidentiality Policy because the hcp is only relevant when a message is encrypted.¶

C.2.1. S/MIME Signed-only signedData Over a Simple Message, Header Protection

This is a signed-only S/MIME message via PKCS#7 signedData. The payload is a text/plain message. It uses the Header Protection scheme from the draft.¶

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 4189 bytes
 ⇩ (unwraps to)
 └─╴text/plain 233 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"
Subject: smime-one-part-hp
Message-ID: <smime-one-part-hp@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:06:02 -0500
User-Agent: Sample MUA Version 1.0

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cyBpcyB0aGUNCnNtaW1lLW9uZS1wYXJ0LWhwDQptZXNzYWdlLg0KDQpUaGlzIGlz
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Lg0KDQotLSANCkFsaWNlDQphbGljZUBzbWltZS5leGFtcGxlDQqgggemMIIDzzCC
AregAwIBAgITDy0lvRE5l0rOQlSHoe49NAaKtDANBgkqhkiG9w0BAQ0FADBVMQ0w
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SiJlWkwtw/cxQq0t4uD2vWYB8gOUH/CVt2Zp1c+auzPKJ2Zu5mY6kHm+hVB+Ithj
LeI7Htg6rNeuXq50/TuTSxX5R1I1EXGt8p6hAQVeA5oZ2afHg4b97enV8gozR0/N
kug4AkXmbk7THNc8vvjMUJanZ/VmS4TgDqXjWShplcI3lcvvBZMswt41/0HJvmSw
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ury/zxnlsukgn+fHbqvwDhJLAgFpW/jA/EB/WI+whUpqtQIDAQABo4GvMIGsMAwG
A1UdEwEB/wQCMAAwFwYDVR0gBBAwDjAMBgpghkgBZQMCATABMB4GA1UdEQQXMBWB
E2FsaWNlQHNtaW1lLmV4YW1wbGUwEwYDVR0lBAwwCgYIKwYBBQUHAwQwDgYDVR0P
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GDAWgBSRMI58BxcMp/EJKGU2GmccaHb0WTANBgkqhkiG9w0BAQ0FAAOCAQEAgUl4
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s8gWVY3WqMeuOA7IizkBD+GDEu8uKveERRXZncxGwy2MfbH1Ib3U8QzTjqB8+dz2
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lVh4OHhyI0qNuz5oShNaACSioQ23WxHGVy9vsdVfnbhsplrWg9NQ2WbpCmK+2oMh
2oYl0Z/wvXMt9cG6jbMvcdH4z0IOvg6mrYkKTM/RCGnumghxwYToj1OyD5Gs4D2I
JCw+fX5ODxh52MbNRYXTus2ZPRPM8JXNQC4GWv4km3M4rKnJDd6hnoQ9rNeozIcB
VyybQYjfrgg4DRvw9Ksk22OH4ConlB8f7R7s1LM2cSYxggIAMIIB/AIBATBsMFUx
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XDr0+GrOmqnXMAsGCWCGSAFlAwQCAaBpMBgGCSqGSIb3DQEJAzELBgkqhkiG9w0B
BwEwHAYJKoZIhvcNAQkFMQ8XDTIxMDIyMDE1MDYwMlowLwYJKoZIhvcNAQkEMSIE
IHBk91pcJj0zJrTyROHOdfUnQMoctIHVb6WXTpS3gYxlMA0GCSqGSIb3DQEBAQUA
BIIBABWhy/yIy9RLS3OdZZTlUNChBhzNHjpSSoL3v0JmzOHeYJVblzBgpyPU33Tu
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FeLYNUvUvFXvV9YCb/0R0pgp9Aw=

C.2.1.1. S/MIME Signed-only signedData Over a Simple Message, Header Protection, Unwrapped

The S/MIME signed-data layer unwraps to:¶

MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: smime-one-part-hp
Message-ID: <smime-one-part-hp@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:06:02 -0500
User-Agent: Sample MUA Version 1.0
Content-Type: text/plain; charset="utf-8"; hp="clear"

This is the
smime-one-part-hp
message.

This is a signed-only S/MIME message via PKCS#7 signedData.  The
payload is a text/plain message. It uses the Header Protection
scheme from the draft.

--
Alice
alice@smime.example

C.2.2. S/MIME Signed-only multipart/signed Over a Simple Message, Header Protection

This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a text/plain message. It uses the Header Protection scheme from the draft.¶

It has the following structure:¶

└┬╴multipart/signed 4435 bytes
 ├─╴text/plain 250 bytes
 └─╴application/pkcs7-signature [smime.p7s] 3429 bytes

Its contents are:¶

MIME-Version: 1.0
Content-Type: multipart/signed;
 protocol="application/pkcs7-signature"; boundary="78f";
 micalg="sha-256"
Subject: smime-multipart-hp
Message-ID: <smime-multipart-hp@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:07:02 -0500
User-Agent: Sample MUA Version 1.0

--78f
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: smime-multipart-hp
Message-ID: <smime-multipart-hp@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:07:02 -0500
User-Agent: Sample MUA Version 1.0
Content-Type: text/plain; charset="utf-8"; hp="clear"

This is the
smime-multipart-hp
message.

This is a signed-only S/MIME message via PKCS#7 detached
signature (multipart/signed).  The payload is a text/plain
message. It uses the Header Protection scheme from the draft.

--
Alice
alice@smime.example

--78f
Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-signature; name="smime.p7s"

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--78f--

C.2.3. S/MIME Signed-only signedData Over a Complex Message, Header Protection

This is a signed-only S/MIME message via PKCS#7 signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Header Protection scheme from the draft.¶

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 5647 bytes
 ⇩ (unwraps to)
 └┬╴multipart/mixed 1570 bytes
  ├┬╴multipart/alternative 934 bytes
  │├─╴text/plain 287 bytes
  │└─╴text/html 382 bytes
  └─╴image/png inline 236 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"
Subject: smime-one-part-complex-hp
Message-ID: <smime-one-part-complex-hp@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:06:02 -0500
User-Agent: Sample MUA Version 1.0

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C.2.3.1. S/MIME Signed-only signedData Over a Complex Message, Header Protection, Unwrapped

The S/MIME signed-data layer unwraps to:¶

MIME-Version: 1.0
Subject: smime-one-part-complex-hp
Message-ID: <smime-one-part-complex-hp@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:06:02 -0500
User-Agent: Sample MUA Version 1.0
Content-Type: multipart/mixed; boundary="e2e"; hp="clear"

--e2e
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="200"

--200
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

This is the
smime-one-part-complex-hp
message.

This is a signed-only S/MIME message via PKCS#7 signedData.  The
payload is a multipart/alternative message with an inline
image/png attachment. It uses the Header Protection scheme from
the draft.

--
Alice
alice@smime.example
--200
Content-Type: text/html; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

<html><head><title></title></head><body>
<p>This is the
<b>smime-one-part-complex-hp</b>
message.</p>
<p>This is a signed-only S/MIME message via PKCS#7 signedData.  The
payload is a multipart/alternative message with an inline
image/png attachment. It uses the Header Protection scheme from
the draft.</p>
<p><tt>-- <br/>Alice<br/>alice@smime.example</tt></p></body></html>
--200--

--e2e
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: inline

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sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli
vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg==

--e2e--

C.2.4. S/MIME Signed-only multipart/signed Over a Complex Message, Header Protection

It has the following structure:¶

└┬╴multipart/signed 5520 bytes
 ├┬╴multipart/mixed 1628 bytes
 │├┬╴multipart/alternative 990 bytes
 ││├─╴text/plain 304 bytes
 ││└─╴text/html 402 bytes
 │└─╴image/png inline 232 bytes
 └─╴application/pkcs7-signature [smime.p7s] 3429 bytes

Its contents are:¶

MIME-Version: 1.0
Content-Type: multipart/signed;
 protocol="application/pkcs7-signature"; boundary="ba4";
 micalg="sha-256"
Subject: smime-multipart-complex-hp
Message-ID: <smime-multipart-complex-hp@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:07:02 -0500
User-Agent: Sample MUA Version 1.0

--ba4
MIME-Version: 1.0
Subject: smime-multipart-complex-hp
Message-ID: <smime-multipart-complex-hp@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:07:02 -0500
User-Agent: Sample MUA Version 1.0
Content-Type: multipart/mixed; boundary="b14"; hp="clear"

--b14
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="f1a"

--f1a
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

This is the
smime-multipart-complex-hp
message.

This is a signed-only S/MIME message via PKCS#7 detached
signature (multipart/signed).  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft.

--
Alice
alice@smime.example
--f1a
Content-Type: text/html; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

<html><head><title></title></head><body>
<p>This is the
<b>smime-multipart-complex-hp</b>
message.</p>
<p>This is a signed-only S/MIME message via PKCS#7 detached
signature (multipart/signed).  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft.</p>
<p><tt>-- <br/>Alice<br/>alice@smime.example</tt></p></body></html>
--f1a--

--b14
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: inline

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--b14--

--ba4
Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-signature; name="smime.p7s"

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--ba4--

C.3. Signed-and-Encrypted Messages

These messages are signed and encrypted. They use PKCS#7 signedData inside envelopedData, with different header protection schemes and different Header Confidentiality Policies.¶

C.3.1. S/MIME Signed and Encrypted Over a Simple Message, Header Protection With hcp_baseline

This is a signed-and-encrypted S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses the Header Protection scheme from the draft with the hcp_baseline Header Confidentiality Policy.¶

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 7825 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 4786 bytes
  ⇩ (unwraps to)
  └─╴text/plain 329 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID: <smime-signed-enc-hp-baseline@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:09:02 -0500
User-Agent: Sample MUA Version 1.0

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1JfP5SOK8BtM08pdiPqycmf23sEkQVVI+EhPZNbmQUVrYZmYSHeaJPcrXjDK2gIE
997lSp8Iw9bZuQHg6E4Zb3AgIwQlkAJM7Li/VFnh31x5PivT9om1DDqQEUlQshZH
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5gFhER4dG8cKiO0NGuL08m74UKgA6vsSz3rJJ5NyXvTGt1vP3j/EuWOUbOFzOSv3
Tq7q4N3yEgLSayg0YEvO8JY+0R2+1EQMTu9I9sv8dCRw+ALR+JI6vJ0gYTLM7A22
l3v7b1FlDWouT+RGrokL//Pnt99uYolCKnRte+LsGZ1/zk87Wx3jxdPHyrWXPzqt
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gCkMyScHvy0iGrk+VAaarrdSwpMT5poPZbudr0K+K3MD7Y1Cp9o7ZBT1rjvKCNIW
vpwQdfVSZV+1Ji5sfyC2RLy7+2vwRU72yB3DJs9rFLk9XfjLHiv+BmVW6Ql4tovY
mn45thtn4zYQEtdANkR8aufQg0A+BDQg3XAQicCb2hhyH6j5VFACh3MPDj1tjy+r
YNi5VcHj1ccnXsk2EaYW2y+SkgcGg/ywmPZ50B/I8GLJWNeb7Ai5VBXCWfMeCIz0
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PcL0faa1xbpEUTfWv6Vviq9VCVkc5q/wxdL1irkqLNR5Ht8PyZUjCH9GsVntgPu+
UDswKkNICxi0rUppHp0Nzr7HRH1Y76htABrX+wyFVtA6ttwbm8nNqSVof7wb0pYa
cHYMfJDCVJvCLCLy/sePxzwGbH8bW/Va4ebVQfNBgS49ATHNbv2HfjROYqgWAINJ
l8L3IqyUROBveA+3+a0wEZ/kJnlIJppNGqIhuS7SiKUBXN+lHvxoGAfeJFN8uQ2B
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VauRPmbhrasLdiZwGyQ65shkUaJMwkjY+BpTK40M5KUV4yLr0ddkzbmKWo4Q50FY
NMc2AtCg1A8e9ziRU4Y2MD8abcs5S8rOKk5/R7o5gJGNHjlHpn9Xz+7fTpqtYqIf
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n5+AmwDhDdpWKXih4nxFgQ==

C.3.1.1. S/MIME Signed and Encrypted Over a Simple Message, Header Protection With hcp_baseline, Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

MIINkgYJKoZIhvcNAQcCoIINgzCCDX8CAQExDTALBglghkgBZQMEAgEwggO7Bgkq
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IFVzZXItQWdlbnQ6IFNhbXBsZSBNVUEgVmVyc2lvbiAxLjANCkNvbnRlbnQtVHlw
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A1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxFzAVBgNVBAMTDkFsaWNlIExv
dmVsYWNlMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtPSJ6Fg4Fj5N
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gyHahiXRn/C9cy31wbqNsy9x0fjPQg6+DqatiQpMz9EIae6aCHHBhOiPU7IPkazg
PYgkLD59fk4PGHnYxs1FhdO6zZk9E8zwlc1ALgZa/iSbczisqckN3qGehD2s16jM
hwFXLJtBiN+uCDgNG/D0qyTbY4fgKieUHx/tHuzUszZxJjGCAgAwggH8AgEBMGww
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BQAEggEASC6sf2ioO3Y7yVOzy/6sbjR6suLfigryPkvaOvuh1aHCP/I071/j3LYL
nER9aCGoEFXzxXzI1aiTjwlQp+Fg6qNz8avFRbSvecUpAsbihlRbbOSirvNwW6F4
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G5uhNtW6SURCQjN+d6PNa182OqCW3w==

C.3.1.2. S/MIME Signed and Encrypted Over a Simple Message, Header Protection With hcp_baseline, Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: smime-signed-enc-hp-baseline
Message-ID: <smime-signed-enc-hp-baseline@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:09:02 -0500
User-Agent: Sample MUA Version 1.0
HP-Outer: Subject: [...]
HP-Outer: Message-ID: <smime-signed-enc-hp-baseline@example>
HP-Outer: From: Alice <alice@smime.example>
HP-Outer: To: Bob <bob@smime.example>
HP-Outer: Date: Sat, 20 Feb 2021 10:09:02 -0500
HP-Outer: User-Agent: Sample MUA Version 1.0
Content-Type: text/plain; charset="utf-8"; hp="cipher"

This is the
smime-signed-enc-hp-baseline
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a text/plain
message. It uses the Header Protection scheme from the draft
with the hcp_baseline Header Confidentiality Policy.

--
Alice
alice@smime.example

C.3.2. S/MIME Signed and Encrypted Over a Simple Message, Header Protection With hcp_baseline (+ Legacy Display)

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 8085 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 4968 bytes
  ⇩ (unwraps to)
  └─╴text/plain 414 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID: <smime-signed-enc-hp-baseline-legacy@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:10:02 -0500
User-Agent: Sample MUA Version 1.0

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pncS4Tc1dVGyddkDXyAZ1JvfFzsXnoX+38R5lI25aYHAbfij582/hv48FU1I3XoB
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lRXXfx7senJDd2tXmXvYkA==

C.3.2.1. S/MIME Signed and Encrypted Over a Simple Message, Header Protection With hcp_baseline (+ Legacy Display), Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

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ag0yCNj1V9V9yu/3DjcYbwW2lJf5NbMHbM1LY4X5chWfNEbkN6hQury/zxnlsukg
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OA7IizkBD+GDEu8uKveERRXZncxGwy2MfbH1Ib3U8QzTjqB8+dz2AwYeMxODWq9o
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ETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFjZTCCASIw
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AaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUDAgEwATAe
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ZnMwHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZIhvcNAQEN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2Y6t9DI4EmJJhay+P4EJwiggTjH9mJeeXIHyKpyELVSC5KCaIghQpTHV/pIH+fNs
WxxyPU2C+RwECSI=

C.3.2.2. S/MIME Signed and Encrypted Over a Simple Message, Header Protection With hcp_baseline (+ Legacy Display), Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: smime-signed-enc-hp-baseline-legacy
Message-ID: <smime-signed-enc-hp-baseline-legacy@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:10:02 -0500
User-Agent: Sample MUA Version 1.0
HP-Outer: Subject: [...]
HP-Outer:
 Message-ID: <smime-signed-enc-hp-baseline-legacy@example>
HP-Outer: From: Alice <alice@smime.example>
HP-Outer: To: Bob <bob@smime.example>
HP-Outer: Date: Sat, 20 Feb 2021 10:10:02 -0500
HP-Outer: User-Agent: Sample MUA Version 1.0
Content-Type: text/plain; charset="utf-8";
 hp-legacy-display="1"; hp="cipher"

Subject: smime-signed-enc-hp-baseline-legacy

This is the
smime-signed-enc-hp-baseline-legacy
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a text/plain
message. It uses the Header Protection scheme from the draft
with the hcp_baseline Header Confidentiality Policy with a
"Legacy Display" part.

--
Alice
alice@smime.example

C.3.3. S/MIME Signed and Encrypted Over a Simple Message, Header Protection With hcp_shy

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 7760 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 4732 bytes
  ⇩ (unwraps to)
  └─╴text/plain 319 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID: <smime-signed-enc-hp-shy@example>
From: alice@smime.example
To: bob@smime.example
Date: Sat, 20 Feb 2021 15:12:02 +0000
User-Agent: Sample MUA Version 1.0

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C.3.3.1. S/MIME Signed and Encrypted Over a Simple Message, Header Protection With hcp_shy, Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

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C.3.3.2. S/MIME Signed and Encrypted Over a Simple Message, Header Protection With hcp_shy, Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: smime-signed-enc-hp-shy
Message-ID: <smime-signed-enc-hp-shy@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:12:02 -0500
User-Agent: Sample MUA Version 1.0
HP-Outer: Subject: [...]
HP-Outer: Message-ID: <smime-signed-enc-hp-shy@example>
HP-Outer: From: alice@smime.example
HP-Outer: To: bob@smime.example
HP-Outer: Date: Sat, 20 Feb 2021 15:12:02 +0000
HP-Outer: User-Agent: Sample MUA Version 1.0
Content-Type: text/plain; charset="utf-8"; hp="cipher"

This is the
smime-signed-enc-hp-shy
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a text/plain
message. It uses the Header Protection scheme from the draft
with the hcp_shy Header Confidentiality Policy.

--
Alice
alice@smime.example

C.3.4. S/MIME Signed and Encrypted Over a Simple Message, Header Protection With hcp_shy (+ Legacy Display)

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 8170 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 5046 bytes
  ⇩ (unwraps to)
  └─╴text/plain 502 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID: <smime-signed-enc-hp-shy-legacy@example>
From: alice@smime.example
To: bob@smime.example
Date: Sat, 20 Feb 2021 15:13:02 +0000
User-Agent: Sample MUA Version 1.0

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m5kyP5p5DST0+cko42Ae0yjn05T75MdYP0/l/I8YBes=

C.3.4.1. S/MIME Signed and Encrypted Over a Simple Message, Header Protection With hcp_shy (+ Legacy Display), Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

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bgcHQNhfe0MXoJHKqYrnG++22tA=

C.3.4.2. S/MIME Signed and Encrypted Over a Simple Message, Header Protection With hcp_shy (+ Legacy Display), Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: smime-signed-enc-hp-shy-legacy
Message-ID: <smime-signed-enc-hp-shy-legacy@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:13:02 -0500
User-Agent: Sample MUA Version 1.0
HP-Outer: Subject: [...]
HP-Outer: Message-ID: <smime-signed-enc-hp-shy-legacy@example>
HP-Outer: From: alice@smime.example
HP-Outer: To: bob@smime.example
HP-Outer: Date: Sat, 20 Feb 2021 15:13:02 +0000
HP-Outer: User-Agent: Sample MUA Version 1.0
Content-Type: text/plain; charset="utf-8";
 hp-legacy-display="1"; hp="cipher"

Subject: smime-signed-enc-hp-shy-legacy
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:13:02 -0500

This is the
smime-signed-enc-hp-shy-legacy
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a text/plain
message. It uses the Header Protection scheme from the draft
with the hcp_shy Header Confidentiality Policy with a "Legacy
Display" part.

--
Alice
alice@smime.example

C.3.5. S/MIME Signed and Encrypted Reply Over a Simple Message, Header Protection With hcp_baseline

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 8300 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 5136 bytes
  ⇩ (unwraps to)
  └─╴text/plain 335 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID: <smime-signed-enc-hp-baseline-reply@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:15:02 -0500
User-Agent: Sample MUA Version 1.0
In-Reply-To: <smime-signed-enc-hp-baseline@example>
References: <smime-signed-enc-hp-baseline@example>

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C.3.5.1. S/MIME Signed and Encrypted Reply Over a Simple Message, Header Protection With hcp_baseline, Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

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a23tU+PDSpfcpG5MJPe9DBzExWII7Z50Om8g6tZETD0+pOjNTAg=

C.3.5.2. S/MIME Signed and Encrypted Reply Over a Simple Message, Header Protection With hcp_baseline, Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: smime-signed-enc-hp-baseline-reply
Message-ID: <smime-signed-enc-hp-baseline-reply@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:15:02 -0500
User-Agent: Sample MUA Version 1.0
In-Reply-To: <smime-signed-enc-hp-baseline@example>
References: <smime-signed-enc-hp-baseline@example>
HP-Outer: Subject: [...]
HP-Outer:
 Message-ID: <smime-signed-enc-hp-baseline-reply@example>
HP-Outer: From: Alice <alice@smime.example>
HP-Outer: To: Bob <bob@smime.example>
HP-Outer: Date: Sat, 20 Feb 2021 10:15:02 -0500
HP-Outer: User-Agent: Sample MUA Version 1.0
HP-Outer: In-Reply-To: <smime-signed-enc-hp-baseline@example>
HP-Outer: References: <smime-signed-enc-hp-baseline@example>
Content-Type: text/plain; charset="utf-8"; hp="cipher"

This is the
smime-signed-enc-hp-baseline-reply
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a text/plain
message. It uses the Header Protection scheme from the draft
with the hcp_baseline Header Confidentiality Policy.

--
Alice
alice@smime.example

C.3.6. S/MIME Signed and Encrypted Reply Over a Simple Message, Header Protection With hcp_baseline (+ Legacy Display)

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 8625 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 5368 bytes
  ⇩ (unwraps to)
  └─╴text/plain 426 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID: <smime-signed-enc-hp-baseline-legacy-reply@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:16:02 -0500
User-Agent: Sample MUA Version 1.0
In-Reply-To: <smime-signed-enc-hp-baseline-legacy@example>
References: <smime-signed-enc-hp-baseline-legacy@example>

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C.3.6.1. S/MIME Signed and Encrypted Reply Over a Simple Message, Header Protection With hcp_baseline (+ Legacy Display), Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

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C.3.6.2. S/MIME Signed and Encrypted Reply Over a Simple Message, Header Protection With hcp_baseline (+ Legacy Display), Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: smime-signed-enc-hp-baseline-legacy-reply
Message-ID: <smime-signed-enc-hp-baseline-legacy-reply@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:16:02 -0500
User-Agent: Sample MUA Version 1.0
In-Reply-To: <smime-signed-enc-hp-baseline-legacy@example>
References: <smime-signed-enc-hp-baseline-legacy@example>
HP-Outer: Subject: [...]
HP-Outer:
 Message-ID: <smime-signed-enc-hp-baseline-legacy-reply@example>
HP-Outer: From: Alice <alice@smime.example>
HP-Outer: To: Bob <bob@smime.example>
HP-Outer: Date: Sat, 20 Feb 2021 10:16:02 -0500
HP-Outer: User-Agent: Sample MUA Version 1.0
HP-Outer:
 In-Reply-To: <smime-signed-enc-hp-baseline-legacy@example>
HP-Outer:
 References: <smime-signed-enc-hp-baseline-legacy@example>
Content-Type: text/plain; charset="utf-8";
 hp-legacy-display="1"; hp="cipher"

Subject: smime-signed-enc-hp-baseline-legacy-reply

This is the
smime-signed-enc-hp-baseline-legacy-reply
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a text/plain
message. It uses the Header Protection scheme from the draft
with the hcp_baseline Header Confidentiality Policy with a
"Legacy Display" part.

--
Alice
alice@smime.example

C.3.7. S/MIME Signed and Encrypted Reply Over a Simple Message, Header Protection With hcp_shy

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 8190 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 5054 bytes
  ⇩ (unwraps to)
  └─╴text/plain 325 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID: <smime-signed-enc-hp-shy-reply@example>
From: alice@smime.example
To: bob@smime.example
Date: Sat, 20 Feb 2021 15:18:02 +0000
User-Agent: Sample MUA Version 1.0
In-Reply-To: <smime-signed-enc-hp-shy@example>
References: <smime-signed-enc-hp-shy@example>

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C.3.7.1. S/MIME Signed and Encrypted Reply Over a Simple Message, Header Protection With hcp_shy, Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

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C.3.7.2. S/MIME Signed and Encrypted Reply Over a Simple Message, Header Protection With hcp_shy, Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: smime-signed-enc-hp-shy-reply
Message-ID: <smime-signed-enc-hp-shy-reply@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:18:02 -0500
User-Agent: Sample MUA Version 1.0
In-Reply-To: <smime-signed-enc-hp-shy@example>
References: <smime-signed-enc-hp-shy@example>
HP-Outer: Subject: [...]
HP-Outer: Message-ID: <smime-signed-enc-hp-shy-reply@example>
HP-Outer: From: alice@smime.example
HP-Outer: To: bob@smime.example
HP-Outer: Date: Sat, 20 Feb 2021 15:18:02 +0000
HP-Outer: User-Agent: Sample MUA Version 1.0
HP-Outer: In-Reply-To: <smime-signed-enc-hp-shy@example>
HP-Outer: References: <smime-signed-enc-hp-shy@example>
Content-Type: text/plain; charset="utf-8"; hp="cipher"

This is the
smime-signed-enc-hp-shy-reply
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a text/plain
message. It uses the Header Protection scheme from the draft
with the hcp_shy Header Confidentiality Policy.

--
Alice
alice@smime.example

C.3.8. S/MIME Signed and Encrypted Reply Over a Simple Message, Header Protection With hcp_shy (+ Legacy Display)

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 8690 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 5418 bytes
  ⇩ (unwraps to)
  └─╴text/plain 514 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID: <smime-signed-enc-hp-shy-legacy-reply@example>
From: alice@smime.example
To: bob@smime.example
Date: Sat, 20 Feb 2021 15:19:02 +0000
User-Agent: Sample MUA Version 1.0
In-Reply-To: <smime-signed-enc-hp-shy-legacy@example>
References: <smime-signed-enc-hp-shy-legacy@example>

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C.3.8.1. S/MIME Signed and Encrypted Reply Over a Simple Message, Header Protection With hcp_shy (+ Legacy Display), Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

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lIw=

C.3.8.2. S/MIME Signed and Encrypted Reply Over a Simple Message, Header Protection With hcp_shy (+ Legacy Display), Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: smime-signed-enc-hp-shy-legacy-reply
Message-ID: <smime-signed-enc-hp-shy-legacy-reply@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:19:02 -0500
User-Agent: Sample MUA Version 1.0
In-Reply-To: <smime-signed-enc-hp-shy-legacy@example>
References: <smime-signed-enc-hp-shy-legacy@example>
HP-Outer: Subject: [...]
HP-Outer:
 Message-ID: <smime-signed-enc-hp-shy-legacy-reply@example>
HP-Outer: From: alice@smime.example
HP-Outer: To: bob@smime.example
HP-Outer: Date: Sat, 20 Feb 2021 15:19:02 +0000
HP-Outer: User-Agent: Sample MUA Version 1.0
HP-Outer: In-Reply-To: <smime-signed-enc-hp-shy-legacy@example>
HP-Outer: References: <smime-signed-enc-hp-shy-legacy@example>
Content-Type: text/plain; charset="utf-8";
 hp-legacy-display="1"; hp="cipher"

Subject: smime-signed-enc-hp-shy-legacy-reply
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 10:19:02 -0500

This is the
smime-signed-enc-hp-shy-legacy-reply
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a text/plain
message. It uses the Header Protection scheme from the draft
with the hcp_shy Header Confidentiality Policy with a "Legacy
Display" part.

--
Alice
alice@smime.example

C.3.9. S/MIME Signed and Encrypted Over a Complex Message, Header Protection With hcp_baseline

This is a signed-and-encrypted S/MIME message using PKCS#7 envelopedData around signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Header Protection scheme from the draft with the hcp_baseline Header Confidentiality Policy.¶

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 10035 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 6412 bytes
  ⇩ (unwraps to)
  └┬╴multipart/mixed 2054 bytes
   ├┬╴multipart/alternative 1124 bytes
   │├─╴text/plain 383 bytes
   │└─╴text/html 478 bytes
   └─╴image/png inline 236 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID: <smime-signed-enc-complex-hp-baseline@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:09:02 -0500
User-Agent: Sample MUA Version 1.0

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6IEfM6Jo8HvcZGPqO0Ra5HSOBPcQ/rEr5GiEtbEUqkJ3PonMEYelK2buI5Lw5sUt
W8/wt9YLuXap2OL4jnVAJrfLf5n3fOPm4F9mCPCzBCNzBv2U+cuASVh9HA4E8+dG
KqR4FEqqv7Mo5DONHdfYk8Sdw5IYx+XGahqk/qvrqR+QXPBbO6oeXLmbIl7TZKus
nqAg6PoENnxf86R3jPwrZOc11jasz0L6zQ6yVQTxlx/Jj3CbzhkYEHh6sU5EPkWu
H2B8lFifdxkn8CIs+cdWcSyVxJlYRU8qwqdUudsXbCfN6bW41/V43yrz4BozVuB8
N3vOTqoDZeLRRAebCaFGRmUGWW03/WvOqqdzMc3UFxBiMDol0Gyr/3tKff2kf/dY
KaHssQYIIC2hh+f5l+Ekp3XjaX6GFtAjM/scJlC0ftupzk9tJG3scEUTbK8MwUxT
pJ59+cj3CtdJHxMVIc904PlPqsocHzK5CpqQD5Clvqj1jFc+eZ9BICZ+s880Ie9B
bFpW1S8AN9UyHl6nCbllDOazUIhdRh5goDv1FRv47Wtr+zZCseGzIJ7oCAE38KDZ
u6QdAe2a16qibKGeOKaZEVm1DDIae6YCIUUJZw/PDmO5Bf8NkRSz2atY8UzyxSxi
K9HYKPDly0ILMF+aQzqvy36IttNYQ22nqN1XVCmYF0HFPnS6RFyDXU+Wa9RATL1p
u/kW8TwMOBveXstkJUm8TBhX5TDEFtg+Y+tyDNb4n4xwpuishLd/pMck6LNK3fO3
cOaqQssUWkpjJSzSeedcA4oonnq833DXP6SPF1ksXlArsDVWB4atlFRqbaUKKrpv
Hinhb+MUjANUW+TcAEznbTyHFvEuNCIX7WU7SlOglcrEjJzGnJZC24+l0KzxF3ed
7PndgDslLmJc4ExhALrKGFw57Muvy1UNd4f6W7AEraj/54FIoZzDRH+R/owcjuiK
Pza8vs8W8792ds1ewGcLs+B1g+l79IbO0+zR4eio1f+6kSsRf+EucrH4RF+lU+ba
w56nBq1EMoBJFuzPrLdAOD9vRVwi8cmKYYf/VgriDvZxqsDsdjC81fUEesG8/iVS
axpAOFhCp8oUQZVg8yRsR7x/m0EjFWZPu9JZwAge76HhwpSu+yg55m5ndeXEy55p
ss6t9jHwuFu7F8q75xTTVE+jBZomyxfYQV0qFvvelF86Hrc+FTobS2AzPRzhwj+p
Wfh8ORVoQaHb/BuAREB/xXCLhzDsirqoUKDcVATLnBUvZIawptgC1OjIaAX3Xgn0
VQXDSeABdtUDVBgI67OgFw==

C.3.9.1. S/MIME Signed and Encrypted Over a Complex Message, Header Protection With hcp_baseline, Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

MIISMQYJKoZIhvcNAQcCoIISIjCCEh4CAQExDTALBglghkgBZQMEAgEwgghaBgkq
hkiG9w0BBwGggghLBIIIR01JTUUtVmVyc2lvbjogMS4wDQpTdWJqZWN0OiBzbWlt
ZS1zaWduZWQtZW5jLWNvbXBsZXgtaHAtYmFzZWxpbmUNCk1lc3NhZ2UtSUQ6IDxz
bWltZS1zaWduZWQtZW5jLWNvbXBsZXgtaHAtYmFzZWxpbmVAZXhhbXBsZT4NCkZy
b206IEFsaWNlIDxhbGljZUBzbWltZS5leGFtcGxlPg0KVG86IEJvYiA8Ym9iQHNt
aW1lLmV4YW1wbGU+DQpEYXRlOiBTYXQsIDIwIEZlYiAyMDIxIDEyOjA5OjAyIC0w
NTAwDQpVc2VyLUFnZW50OiBTYW1wbGUgTVVBIFZlcnNpb24gMS4wDQpIUC1PdXRl
cjogU3ViamVjdDogWy4uLl0NCkhQLU91dGVyOg0KIE1lc3NhZ2UtSUQ6IDxzbWlt
ZS1zaWduZWQtZW5jLWNvbXBsZXgtaHAtYmFzZWxpbmVAZXhhbXBsZT4NCkhQLU91
dGVyOiBGcm9tOiBBbGljZSA8YWxpY2VAc21pbWUuZXhhbXBsZT4NCkhQLU91dGVy
OiBUbzogQm9iIDxib2JAc21pbWUuZXhhbXBsZT4NCkhQLU91dGVyOiBEYXRlOiBT
YXQsIDIwIEZlYiAyMDIxIDEyOjA5OjAyIC0wNTAwDQpIUC1PdXRlcjogVXNlci1B
Z2VudDogU2FtcGxlIE1VQSBWZXJzaW9uIDEuMA0KQ29udGVudC1UeXBlOiBtdWx0
aXBhcnQvbWl4ZWQ7IGJvdW5kYXJ5PSJlMDMiOyBocD0iY2lwaGVyIg0KDQotLWUw
Mw0KTUlNRS1WZXJzaW9uOiAxLjANCkNvbnRlbnQtVHlwZTogbXVsdGlwYXJ0L2Fs
dGVybmF0aXZlOyBib3VuZGFyeT0iNzk5Ig0KDQotLTc5OQ0KQ29udGVudC1UeXBl
OiB0ZXh0L3BsYWluOyBjaGFyc2V0PSJ1cy1hc2NpaSINCk1JTUUtVmVyc2lvbjog
MS4wDQpDb250ZW50LVRyYW5zZmVyLUVuY29kaW5nOiA3Yml0DQoNClRoaXMgaXMg
dGhlDQpzbWltZS1zaWduZWQtZW5jLWNvbXBsZXgtaHAtYmFzZWxpbmUNCm1lc3Nh
Z2UuDQoNClRoaXMgaXMgYSBzaWduZWQtYW5kLWVuY3J5cHRlZCBTL01JTUUgbWVz
c2FnZSB1c2luZyBQS0NTIzcNCmVudmVsb3BlZERhdGEgYXJvdW5kIHNpZ25lZERh
dGEuICBUaGUgcGF5bG9hZCBpcyBhDQptdWx0aXBhcnQvYWx0ZXJuYXRpdmUgbWVz
c2FnZSB3aXRoIGFuIGlubGluZSBpbWFnZS9wbmcNCmF0dGFjaG1lbnQuIEl0IHVz
ZXMgdGhlIEhlYWRlciBQcm90ZWN0aW9uIHNjaGVtZSBmcm9tIHRoZSBkcmFmdA0K
d2l0aCB0aGUgaGNwX2Jhc2VsaW5lIEhlYWRlciBDb25maWRlbnRpYWxpdHkgUG9s
aWN5Lg0KDQotLSANCkFsaWNlDQphbGljZUBzbWltZS5leGFtcGxlDQotLTc5OQ0K
Q29udGVudC1UeXBlOiB0ZXh0L2h0bWw7IGNoYXJzZXQ9InVzLWFzY2lpIg0KTUlN
RS1WZXJzaW9uOiAxLjANCkNvbnRlbnQtVHJhbnNmZXItRW5jb2Rpbmc6IDdiaXQN
Cg0KPGh0bWw+PGhlYWQ+PHRpdGxlPjwvdGl0bGU+PC9oZWFkPjxib2R5Pg0KPHA+
VGhpcyBpcyB0aGUNCjxiPnNtaW1lLXNpZ25lZC1lbmMtY29tcGxleC1ocC1iYXNl
bGluZTwvYj4NCm1lc3NhZ2UuPC9wPg0KPHA+VGhpcyBpcyBhIHNpZ25lZC1hbmQt
ZW5jcnlwdGVkIFMvTUlNRSBtZXNzYWdlIHVzaW5nIFBLQ1MjNw0KZW52ZWxvcGVk
RGF0YSBhcm91bmQgc2lnbmVkRGF0YS4gIFRoZSBwYXlsb2FkIGlzIGENCm11bHRp
cGFydC9hbHRlcm5hdGl2ZSBtZXNzYWdlIHdpdGggYW4gaW5saW5lIGltYWdlL3Bu
Zw0KYXR0YWNobWVudC4gSXQgdXNlcyB0aGUgSGVhZGVyIFByb3RlY3Rpb24gc2No
ZW1lIGZyb20gdGhlIGRyYWZ0DQp3aXRoIHRoZSBoY3BfYmFzZWxpbmUgSGVhZGVy
IENvbmZpZGVudGlhbGl0eSBQb2xpY3kuPC9wPg0KPHA+PHR0Pi0tIDxici8+QWxp
Y2U8YnIvPmFsaWNlQHNtaW1lLmV4YW1wbGU8L3R0PjwvcD48L2JvZHk+PC9odG1s
Pg0KLS03OTktLQ0KDQotLWUwMw0KQ29udGVudC1UeXBlOiBpbWFnZS9wbmcNCkNv
bnRlbnQtVHJhbnNmZXItRW5jb2Rpbmc6IGJhc2U2NA0KQ29udGVudC1EaXNwb3Np
dGlvbjogaW5saW5lDQoNCmlWQk9SdzBLR2dvQUFBQU5TVWhFVWdBQUFCUUFBQUFV
Q0FZQUFBQ05pUjBOQUFBQWNFbEVRVlI0MnVWVE94YkENCk1BZ1M3MzluTzNUcFJ3
MjBkcXBiZkFSUUVqT3l3aXdZbkN0a0RLbmJjTGs2NnNxbFQrenQ5Y2lka0UrNkt3
a1oNCnNncnpmY3FWTXBMMmpvMDQ0N2dZRHBlQXJrK09uSkhrSWhBZlRQUmljaWhB
ZjVZSnJ3N3ZqdjBaV1JXTS91bGkNCnZkUGYxUVoya0REOXhwcGQ4d0FBQUFCSlJV
NUVya0pnZ2c9PQ0KDQotLWUwMy0tDQqgggemMIIDzzCCAregAwIBAgITDy0lvRE5
l0rOQlSHoe49NAaKtDANBgkqhkiG9w0BAQ0FADBVMQ0wCwYDVQQKEwRJRVRGMREw
DwYDVQQLEwhMQU1QUyBXRzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0
aWZpY2F0aW9uIEF1dGhvcml0eTAgFw0xOTExMjAwNjU0MThaGA8yMDUyMDkyNzA2
NTQxOFowOzENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxFzAVBgNV
BAMTDkFsaWNlIExvdmVsYWNlMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC
AQEAmpUp+ovBouOP6AFQJ+RpwpODxxzY60n1lJ53pTeNSiJlWkwtw/cxQq0t4uD2
vWYB8gOUH/CVt2Zp1c+auzPKJ2Zu5mY6kHm+hVB+IthjLeI7Htg6rNeuXq50/TuT
SxX5R1I1EXGt8p6hAQVeA5oZ2afHg4b97enV8gozR0/Nkug4AkXmbk7THNc8vvjM
UJanZ/VmS4TgDqXjWShplcI3lcvvBZMswt41/0HJvmSwqpS6oQcAx3Weag0yCNj1
V9V9yu/3DjcYbwW2lJf5NbMHbM1LY4X5chWfNEbkN6hQury/zxnlsukgn+fHbqvw
DhJLAgFpW/jA/EB/WI+whUpqtQIDAQABo4GvMIGsMAwGA1UdEwEB/wQCMAAwFwYD
VR0gBBAwDjAMBgpghkgBZQMCATABMB4GA1UdEQQXMBWBE2FsaWNlQHNtaW1lLmV4
YW1wbGUwEwYDVR0lBAwwCgYIKwYBBQUHAwQwDgYDVR0PAQH/BAQDAgUgMB0GA1Ud
DgQWBBSiU0HVRDyAKRV8ASPw546vzfN3DzAfBgNVHSMEGDAWgBSRMI58BxcMp/EJ
KGU2GmccaHb0WTANBgkqhkiG9w0BAQ0FAAOCAQEAgUl4oJyxMpwWpAylOvK6NEbM
l1gD5H14EC4Muxq1u0q2XgXOSBHI6DfX/4LDsfx7fSIus8gWVY3WqMeuOA7IizkB
D+GDEu8uKveERRXZncxGwy2MfbH1Ib3U8QzTjqB8+dz2AwYeMxODWq9opwtA/lTO
kRg8uuivZfg/m5fFo/QshlHNaaTDVEXsU4Ps98Hm/3gznbvhdjFbZbi4oZ3tAadR
lE5K9JiQaJYOnUmGpfB8PPwDR6chMZeegSQAW++OIKqHrg/WEh4yiuPfqmAvX2hZ
kPpivNJYdTPUXTSO7K459CyqbqG+sNOo2kc1nTXl85RHNrVKQK+L0YWY1Q+hWDCC
A88wggK3oAMCAQICEzdBBXntdX9CqaJcOvT4as6aqdcwDQYJKoZIhvcNAQENBQAw
VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh
bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkwIBcNMTkxMTIw
MDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoTBElFVEYxETAPBgNV
BAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFjZTCCASIwDQYJKoZI
hvcNAQEBBQADggEPADCCAQoCggEBALT0iehYOBY+TZp/T5K2KNI05Hwr+E3wP6XT
vyi6WWyTgBK9LCOwI2juwdRrjFBSXkk7pWpjXwsA3A5GOtz0FpfgyC7OxsVcF7q4
WHWZWleYXFKlQHJD73nQwXP968+A/3rBX7PhO0DBbZnfitOLPgPEwjTtdg0VQQ6W
z+CRQ/YbHPKaw7aRphZO63dKvIKp4cQVtkWQHi6syTjGsgkLcLNau5LZDQUdsGV+
SAo3nBdWCRYV+I65x8Kf4hCxqqmjV3d/2NKRu0BXnDe/N+iDz3X0zEoj0fqXgq4S
WcC0nsG1lyyXt1TL270I6ATKRGJWiQVCCpDtc0NT6vdJ45bCSzsCAwEAAaOBrzCB
rDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUDAgEwATAeBgNVHREE
FzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoGCCsGAQUFBwMEMA4G
A1UdDwEB/wQEAwIGwDAdBgNVHQ4EFgQUu/bMsi0dBhIcl64papAQ0yBmZnMwHwYD
VR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZIhvcNAQENBQADggEB
AHOJojanzqmgaSN3/gqSQ4cbbmdj/R40BEPr+gXT+xiidfZ2iLNwYyTneuK6AChw
KfnNvOFb8lV1iffRTF/KtmVEDMR/sYeqAH83KM5p3el2lVh4OHhyI0qNuz5oShNa
ACSioQ23WxHGVy9vsdVfnbhsplrWg9NQ2WbpCmK+2oMh2oYl0Z/wvXMt9cG6jbMv
cdH4z0IOvg6mrYkKTM/RCGnumghxwYToj1OyD5Gs4D2IJCw+fX5ODxh52MbNRYXT
us2ZPRPM8JXNQC4GWv4km3M4rKnJDd6hnoQ9rNeozIcBVyybQYjfrgg4DRvw9Ksk
22OH4ConlB8f7R7s1LM2cSYxggIAMIIB/AIBATBsMFUxDTALBgNVBAoTBElFVEYx
ETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENl
cnRpZmljYXRpb24gQXV0aG9yaXR5AhM3QQV57XV/QqmiXDr0+GrOmqnXMAsGCWCG
SAFlAwQCAaBpMBgGCSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkF
MQ8XDTIxMDIyMDE3MDkwMlowLwYJKoZIhvcNAQkEMSIEIFPOmRBiI1gpSbRbrEhT
xW8uQ+V/G/cmOB6495mnsKVeMA0GCSqGSIb3DQEBAQUABIIBADgh7UBYrX+esUzQ
I9zNqk4LnbgdQoUdeJtdY2Jvyl6dlV8cfIFNgng8IluuuJI48a5yJwYG3060AkvF
JC/hq7sSBCLzNVb9UioTixGi+4nGB2iRb7TKsfamuyh5Zdjg4OrN8N1H4rwUQ1K4
Sis2TCi5/TSc+UYG7rH+YyIRSeVxNCII3rEA8E+dDRg6R5bqOTHxInQbBvG9q19e
pelntJeSxvRSOSYwcoNGXenZ6S7eqfB3iln65d0gURSV7hPSfZwh1QSZa47egE7V
9Dgce5pbZYQgeB27mLBCpsgRgYKbQ/+NBPBexT6Kxixd4sND++AZ6kUie+AvUpXo
+kGun/Q=

C.3.9.2. S/MIME Signed and Encrypted Over a Complex Message, Header Protection With hcp_baseline, Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Subject: smime-signed-enc-complex-hp-baseline
Message-ID: <smime-signed-enc-complex-hp-baseline@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:09:02 -0500
User-Agent: Sample MUA Version 1.0
HP-Outer: Subject: [...]
HP-Outer:
 Message-ID: <smime-signed-enc-complex-hp-baseline@example>
HP-Outer: From: Alice <alice@smime.example>
HP-Outer: To: Bob <bob@smime.example>
HP-Outer: Date: Sat, 20 Feb 2021 12:09:02 -0500
HP-Outer: User-Agent: Sample MUA Version 1.0
Content-Type: multipart/mixed; boundary="e03"; hp="cipher"

--e03
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="799"

--799
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

This is the
smime-signed-enc-complex-hp-baseline
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_baseline Header Confidentiality Policy.

--
Alice
alice@smime.example
--799
Content-Type: text/html; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

<html><head><title></title></head><body>
<p>This is the
<b>smime-signed-enc-complex-hp-baseline</b>
message.</p>
<p>This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_baseline Header Confidentiality Policy.</p>
<p><tt>-- <br/>Alice<br/>alice@smime.example</tt></p></body></html>
--799--

--e03
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: inline

iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA
MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ
sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli
vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg==

--e03--

C.3.10. S/MIME Signed and Encrypted Over a Complex Message, Header Protection With hcp_baseline (+ Legacy Display)

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 10640 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 6856 bytes
  ⇩ (unwraps to)
  └┬╴multipart/mixed 2367 bytes
   ├┬╴multipart/alternative 1415 bytes
   │├─╴text/plain 476 bytes
   │└─╴text/html 636 bytes
   └─╴image/png inline 236 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID:
 <smime-signed-enc-complex-hp-baseline-legacy@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:10:02 -0500
User-Agent: Sample MUA Version 1.0

MIIerAYJKoZIhvcNAQcDoIIenTCCHpkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV
BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN
UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00
Boq0MA0GCSqGSIb3DQEBAQUABIIBACLgXflY746FTqdLnYLWQE/uY53acAbSNoGw
OY86dFVtfd4kmtKoF6bqyRom13sRj228BwPm4P/SiMKTt40967XTuuuYFzWYOIl5
QV1W+59RRrZnNMD71rG6Cy/t2jcn55iGjpFhVUgD9LMD4YgO2LJfvOoQLFDDvI0w
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CsaVp7atHrCNZmUSb0wrcfdXkRYmMYu8Tws/+Ck/5LBKc6FRRv478oqZLpP88Bkh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C.3.10.1. S/MIME Signed and Encrypted Over a Complex Message, Header Protection With hcp_baseline (+ Legacy Display), Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

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C.3.10.2. S/MIME Signed and Encrypted Over a Complex Message, Header Protection With hcp_baseline (+ Legacy Display), Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Subject: smime-signed-enc-complex-hp-baseline-legacy
Message-ID:
 <smime-signed-enc-complex-hp-baseline-legacy@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:10:02 -0500
User-Agent: Sample MUA Version 1.0
HP-Outer: Subject: [...]
HP-Outer: Message-ID:
 <smime-signed-enc-complex-hp-baseline-legacy@example>
HP-Outer: From: Alice <alice@smime.example>
HP-Outer: To: Bob <bob@smime.example>
HP-Outer: Date: Sat, 20 Feb 2021 12:10:02 -0500
HP-Outer: User-Agent: Sample MUA Version 1.0
Content-Type: multipart/mixed; boundary="308"; hp="cipher"

--308
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="fff"

--fff
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="us-ascii";
 hp-legacy-display="1"

Subject: smime-signed-enc-complex-hp-baseline-legacy

This is the
smime-signed-enc-complex-hp-baseline-legacy
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_baseline Header Confidentiality Policy with a
"Legacy Display" part.

--
Alice
alice@smime.example
--fff
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/html; charset="us-ascii";
 hp-legacy-display="1"

<html><head><title></title></head><body>
<div class="header-protection-legacy-display">
<pre>
Subject: smime-signed-enc-complex-hp-baseline-legacy
</pre>
</div><p>This is the
<b>smime-signed-enc-complex-hp-baseline-legacy</b>
message.</p>
<p>This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_baseline Header Confidentiality Policy with a
"Legacy Display" part.</p>
<p><tt>-- <br>Alice<br>alice@smime.example</tt></p></body></html>
--fff--

--308
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: inline

iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA
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vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg==

--308--

C.3.11. S/MIME Signed and Encrypted Over a Complex Message, Header Protection With hcp_shy

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 9925 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 6342 bytes
  ⇩ (unwraps to)
  └┬╴multipart/mixed 2003 bytes
   ├┬╴multipart/alternative 1104 bytes
   │├─╴text/plain 373 bytes
   │└─╴text/html 468 bytes
   └─╴image/png inline 236 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID: <smime-signed-enc-complex-hp-shy@example>
From: alice@smime.example
To: bob@smime.example
Date: Sat, 20 Feb 2021 17:12:02 +0000
User-Agent: Sample MUA Version 1.0

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C.3.11.1. S/MIME Signed and Encrypted Over a Complex Message, Header Protection With hcp_shy, Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

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nzc=

C.3.11.2. S/MIME Signed and Encrypted Over a Complex Message, Header Protection With hcp_shy, Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Subject: smime-signed-enc-complex-hp-shy
Message-ID: <smime-signed-enc-complex-hp-shy@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:12:02 -0500
User-Agent: Sample MUA Version 1.0
HP-Outer: Subject: [...]
HP-Outer: Message-ID: <smime-signed-enc-complex-hp-shy@example>
HP-Outer: From: alice@smime.example
HP-Outer: To: bob@smime.example
HP-Outer: Date: Sat, 20 Feb 2021 17:12:02 +0000
HP-Outer: User-Agent: Sample MUA Version 1.0
Content-Type: multipart/mixed; boundary="1fa"; hp="cipher"

--1fa
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="601"

--601
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

This is the
smime-signed-enc-complex-hp-shy
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_shy Header Confidentiality Policy.

--
Alice
alice@smime.example
--601
Content-Type: text/html; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

<html><head><title></title></head><body>
<p>This is the
<b>smime-signed-enc-complex-hp-shy</b>
message.</p>
<p>This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_shy Header Confidentiality Policy.</p>
<p><tt>-- <br/>Alice<br/>alice@smime.example</tt></p></body></html>
--601--

--1fa
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: inline

iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA
MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ
sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli
vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg==

--1fa--

C.3.12. S/MIME Signed and Encrypted Over a Complex Message, Header Protection With hcp_shy (+ Legacy Display)

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 10920 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 7072 bytes
  ⇩ (unwraps to)
  └┬╴multipart/mixed 2519 bytes
   ├┬╴multipart/alternative 1597 bytes
   │├─╴text/plain 564 bytes
   │└─╴text/html 736 bytes
   └─╴image/png inline 236 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID: <smime-signed-enc-complex-hp-shy-legacy@example>
From: alice@smime.example
To: bob@smime.example
Date: Sat, 20 Feb 2021 17:13:02 +0000
User-Agent: Sample MUA Version 1.0

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C.3.12.1. S/MIME Signed and Encrypted Over a Complex Message, Header Protection With hcp_shy (+ Legacy Display), Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

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U3Zqnl/G

C.3.12.2. S/MIME Signed and Encrypted Over a Complex Message, Header Protection With hcp_shy (+ Legacy Display), Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Subject: smime-signed-enc-complex-hp-shy-legacy
Message-ID: <smime-signed-enc-complex-hp-shy-legacy@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:13:02 -0500
User-Agent: Sample MUA Version 1.0
HP-Outer: Subject: [...]
HP-Outer:
 Message-ID: <smime-signed-enc-complex-hp-shy-legacy@example>
HP-Outer: From: alice@smime.example
HP-Outer: To: bob@smime.example
HP-Outer: Date: Sat, 20 Feb 2021 17:13:02 +0000
HP-Outer: User-Agent: Sample MUA Version 1.0
Content-Type: multipart/mixed; boundary="cd5"; hp="cipher"

--cd5
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="582"

--582
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="us-ascii";
 hp-legacy-display="1"

Subject: smime-signed-enc-complex-hp-shy-legacy
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:13:02 -0500

This is the
smime-signed-enc-complex-hp-shy-legacy
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_shy Header Confidentiality Policy with a "Legacy
Display" part.

--
Alice
alice@smime.example
--582
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/html; charset="us-ascii";
 hp-legacy-display="1"

<html><head><title></title></head><body>
<div class="header-protection-legacy-display">
<pre>
Subject: smime-signed-enc-complex-hp-shy-legacy
From: Alice &lt;alice@smime.example&gt;
To: Bob &lt;bob@smime.example&gt;
Date: Sat, 20 Feb 2021 12:13:02 -0500
</pre>
</div><p>This is the
<b>smime-signed-enc-complex-hp-shy-legacy</b>
message.</p>
<p>This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_shy Header Confidentiality Policy with a "Legacy
Display" part.</p>
<p><tt>-- <br>Alice<br>alice@smime.example</tt></p></body></html>
--582--

--cd5
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: inline

iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA
MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ
sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli
vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg==

--cd5--

C.3.13. S/MIME Signed and Encrypted Reply Over a Complex Message, Header Protection With hcp_baseline

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 10575 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 6820 bytes
  ⇩ (unwraps to)
  └┬╴multipart/mixed 2345 bytes
   ├┬╴multipart/alternative 1136 bytes
   │├─╴text/plain 389 bytes
   │└─╴text/html 484 bytes
   └─╴image/png inline 236 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID: <smime-signed-enc-complex-hp-baseline-reply@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:15:02 -0500
User-Agent: Sample MUA Version 1.0
In-Reply-To: <smime-signed-enc-complex-hp-baseline@example>
References: <smime-signed-enc-complex-hp-baseline@example>

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Ei0bjuKJAlaUpBfosaw/f+Ft/PUYlpJ5hXPFv8qJ+bpmHF2ACNPyrmYDJ0lTzvMs
Q0zDJUZsMSENb24FCR6eMLMBgA+Uh2ix7FafPTqx1p7B80F/f3royH0NgIHzkm38
SYvwLs6MYKlioM7+wMU8qDOYweh1IgR6oBDqaeC8lrFHai7c6h67QgV2qDlajIyO
ejoTbnWuRDmTrRdINTRpne3SQoKalSzUfARcbuWoVC5cmxdL+wlYT3PM1mWZ94cW
XNhGFb6qcwBtK5PWxxwIj6RxrwEK2Z/+EfWHHiqtHT8Ft73gILqMYMce0ve+8Adx
g4JBn/pKvTaEt+n0/cUJlN1zk9Cpf19ug8y798vMD4vQJ8Iv9xk+zaNZ4SrRVvZC
jbiEXAVuwkGzIRobUDC4gE/PnnPB6hbhJM3dSbHhf+LaZfR2lh3f4anQbunn/sDh
ohLXkzDz9K+9RN2P0uS+0M1IHnBqX7vHlSUXpw3s0l8JVEF8gigXF5GV7F/EXWlM
2LEvrVjXI3OlVHSbhPogCD+98smaAnIUuBQ7Tr+0nSIMKZ4Bct8jyx3C1dlZk31x
X4VrEMLatemExIVkIqk7VC9a+U8zV5vpyJO1SDJo9Bm/mbxi0M7DwSbaxJrOURPI
gFJveIetLrwTNeq0auBcuGXjyQVdNQtLIXydBGTzg6Rj9W0/yeHQYZh8IUlQB4It
TBTniPTYpfUiVe6acfDDKeESd+S6SH9ZNaXnZBTqxpJHeVUBtFnplZagjlZiKP9M
0CRAycswHBfIT9BGIr4odnvOk9aWifBHDqjGJ4XGaiKSQZ0xuZRZdEPyoRg9FsAA
mlyMF+JdANy9hGdbStDS3ok2tKiRPzArphUass9P30Mrp+hphehljDw58vQxyIj2
rTBdv9G4A8gE37hn1A9wo1mW0E0K2nLl/CVPNZDlavLTWcx/RCLUgTtgTvQsERVa
CktsA9Fd6jUK2bqZIcvS4lRXRHyWtLRQD/WbNR6iGFq3ou6iKSWiOAuwmMgfcnsT
yREWaTY3gs1eIHCRMU1qfxz6WecCM2DpgEQVL0cZBDJNB6d2MsDjkcGCrsi9hPda
vPDNKMsxAAfkeUT4nQ1FbkGFN19wfMvHzZdj3t2nv28ORyarOMR7JdZy8uH9ZC2x
MBUUpa8dcLqfCsIwfMqHSmHwoE7avo4B+j9gaFbONyUrpS9XivPaR4C/VdpvmEx4
uPCQcON3hnxts4H0Bbnxr567VRLH9M2lh95uURXg2QroDNXBKibYNLEXrGnsuR6e
G1+GPxXVk5LB3QavktPU9UUnCTU/yh7OJUUJC7LAIcOkuQfG8W/cVWa92dXoGFIc
sePH1GM5AmG3EkaeXItR5gT2gG6S2J6WfarVJSkvK2DL962V5btA9qFvu85hxjC+
/XcucUlbcEPixrv0ZfXeKeykOk1NKKiJ3bVnGZpQIql/dT1LxPFF9pEDQMOtucec
cuDbVmh691nt5Wx8Emk09BXRWOsxqgS9Rp0ZnYl9/0CYwJWH178sfRfuZvCG4Lv6
bd1a+A80hEshOhqZxXEZlrSGNSVw7jIN5CIXX0cs62UKsx/+PQQIV8RQZafy2vbz
N7PN501YdbE7nRjIMGMRcs5tibuukn9/HRY4+NsaLik+olW74q1EHp1N0gtRBiYM
wvFTWnTqguogKEWb1RAysycPUuTV8RvnGN95y58c4pnpTwZRFw8rhGnE0VHSTVq8
6796GuKYcExa3RoX2PUU4FDpufq0kfCRlWxvuUM5m2lr73TA2hb6icXhsNJ8OEGa
AfufQi+RH93+6UFTrmWlsxMhRxR2NpWxXNEB/7tkyjpK5jh+oN0f279PapJ3FfLO
AV7phEbm4W0BSBdNJmnzLQipGKzszyTd4XlgaXB2HqxFlWbKWJdAdHkFK8faN4SK
ztxxOBngAlBMdPtxEi4tev7S93SFKoqMwY18vHlLOHi/oFpaWMjJsE4uxdqvtz/x
aeZMmgstD1ZYRykBqGzjm8cMeoQawJ9HF6AkNFPo9+AsgXCuPNhutGZuCv3vAWTg
yXAiMHDuzahSggfr7r2ixkDUxD12/5RSeSDvCkeCWsjBKVpyzoWn2QksAMBoETyN
F2gcjouX2Cp+OkOQV0e8Y6zIOWE/SGUkFkUDRJUSA8gkpfXWDPV8MN6rAMULWUGP
jYcRtabSgnlXKn6VivRiBlGXvp7iOXpsoGtMwof9hUcoo/HYMAvdsd5anaIZU8tA
g+c+8OHky2OJ5mzUWmk1CcBIWO9yyAHsy7ivSVzJtxDuTrQAuuH92MZgyvGnoioM
uaKOwNzrmhAAhBruv0XpMd/RBIu5+e8EM+fIuYwwwYDWIpn9vMbkKiBv4h5PQ8+T
cunAwgNdg0qVFeZ96Gu1sIHttbexEvSADg9fplx7TG+DZgSrDkxhnJ80a0hZhZ2F
CYJJrvEcQn+/ItTftmmV5tpG2r/LCufYFL26h0RXdD8=

C.3.13.1. S/MIME Signed and Encrypted Reply Over a Complex Message, Header Protection With hcp_baseline, Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"
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aW1hZ2UvcG5nDQphdHRhY2htZW50LiBJdCB1c2VzIHRoZSBIZWFkZXIgUHJvdGVj
dGlvbiBzY2hlbWUgZnJvbSB0aGUgZHJhZnQNCndpdGggdGhlIGhjcF9iYXNlbGlu
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PGJyLz5BbGljZTxici8+YWxpY2VAc21pbWUuZXhhbXBsZTwvdHQ+PC9wPjwvYm9k
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L3BuZw0KQ29udGVudC1UcmFuc2Zlci1FbmNvZGluZzogYmFzZTY0DQpDb250ZW50
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OW5PM1RwUncyMGRxcGJmQVJRRWpPeXdpd1luQ3RrREtuYmNMazY2c3FsVCt6dDlj
aWRrRSs2S3drWg0Kc2dyemZjcVZNcEwyam8wNDQ3Z1lEcGVBcmsrT25KSGtJaEFm
VFBSaWNpaEFmNVlKcnc3dmp2MFpXUldNL3VsaQ0KdmRQZjFRWjJrREQ5eHBwZDh3
QUFBQUJKUlU1RXJrSmdnZz09DQoNCi0tYjJmLS0NCqCCB6YwggPPMIICt6ADAgEC
AhMPLSW9ETmXSs5CVIeh7j00Boq0MA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoT
BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMg
UlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIw
NTIwOTI3MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBX
RzEXMBUGA1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IB
DwAwggEKAoIBAQCalSn6i8Gi44/oAVAn5GnCk4PHHNjrSfWUnnelN41KImVaTC3D
9zFCrS3i4Pa9ZgHyA5Qf8JW3ZmnVz5q7M8onZm7mZjqQeb6FUH4i2GMt4jse2Dqs
165ernT9O5NLFflHUjURca3ynqEBBV4DmhnZp8eDhv3t6dXyCjNHT82S6DgCReZu
TtMc1zy++MxQlqdn9WZLhOAOpeNZKGmVwjeVy+8FkyzC3jX/Qcm+ZLCqlLqhBwDH
dZ5qDTII2PVX1X3K7/cONxhvBbaUl/k1swdszUtjhflyFZ80RuQ3qFC6vL/PGeWy
6SCf58duq/AOEksCAWlb+MD8QH9Yj7CFSmq1AgMBAAGjga8wgawwDAYDVR0TAQH/
BAIwADAXBgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VA
c21pbWUuZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMC
BSAwHQYDVR0OBBYEFKJTQdVEPIApFXwBI/Dnjq/N83cPMB8GA1UdIwQYMBaAFJEw
jnwHFwyn8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQCBSXignLEynBak
DKU68ro0RsyXWAPkfXgQLgy7GrW7SrZeBc5IEcjoN9f/gsOx/Ht9Ii6zyBZVjdao
x644DsiLOQEP4YMS7y4q94RFFdmdzEbDLYx9sfUhvdTxDNOOoHz53PYDBh4zE4Na
r2inC0D+VM6RGDy66K9l+D+bl8Wj9CyGUc1ppMNURexTg+z3web/eDOdu+F2MVtl
uLihne0Bp1GUTkr0mJBolg6dSYal8Hw8/ANHpyExl56BJABb744gqoeuD9YSHjKK
49+qYC9faFmQ+mK80lh1M9RdNI7srjn0LKpuob6w06jaRzWdNeXzlEc2tUpAr4vR
hZjVD6FYMIIDzzCCAregAwIBAgITN0EFee11f0Kpolw69Phqzpqp1zANBgkqhkiG
9w0BAQ0FADBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzExMC8G
A1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTAg
Fw0xOTExMjAwNjU0MThaGA8yMDUyMDkyNzA2NTQxOFowOzENMAsGA1UEChMESUVU
RjERMA8GA1UECxMITEFNUFMgV0cxFzAVBgNVBAMTDkFsaWNlIExvdmVsYWNlMIIB
IjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtPSJ6Fg4Fj5Nmn9PkrYo0jTk
fCv4TfA/pdO/KLpZbJOAEr0sI7AjaO7B1GuMUFJeSTulamNfCwDcDkY63PQWl+DI
Ls7GxVwXurhYdZlaV5hcUqVAckPvedDBc/3rz4D/esFfs+E7QMFtmd+K04s+A8TC
NO12DRVBDpbP4JFD9hsc8prDtpGmFk7rd0q8gqnhxBW2RZAeLqzJOMayCQtws1q7
ktkNBR2wZX5ICjecF1YJFhX4jrnHwp/iELGqqaNXd3/Y0pG7QFecN7836IPPdfTM
SiPR+peCrhJZwLSewbWXLJe3VMvbvQjoBMpEYlaJBUIKkO1zQ1Pq90njlsJLOwID
AQABo4GvMIGsMAwGA1UdEwEB/wQCMAAwFwYDVR0gBBAwDjAMBgpghkgBZQMCATAB
MB4GA1UdEQQXMBWBE2FsaWNlQHNtaW1lLmV4YW1wbGUwEwYDVR0lBAwwCgYIKwYB
BQUHAwQwDgYDVR0PAQH/BAQDAgbAMB0GA1UdDgQWBBS79syyLR0GEhyXrilqkBDT
IGZmczAfBgNVHSMEGDAWgBSRMI58BxcMp/EJKGU2GmccaHb0WTANBgkqhkiG9w0B
AQ0FAAOCAQEAc4miNqfOqaBpI3f+CpJDhxtuZ2P9HjQEQ+v6BdP7GKJ19naIs3Bj
JOd64roAKHAp+c284VvyVXWJ99FMX8q2ZUQMxH+xh6oAfzcozmnd6XaVWHg4eHIj
So27PmhKE1oAJKKhDbdbEcZXL2+x1V+duGymWtaD01DZZukKYr7agyHahiXRn/C9
cy31wbqNsy9x0fjPQg6+DqatiQpMz9EIae6aCHHBhOiPU7IPkazgPYgkLD59fk4P
GHnYxs1FhdO6zZk9E8zwlc1ALgZa/iSbczisqckN3qGehD2s16jMhwFXLJtBiN+u
CDgNG/D0qyTbY4fgKieUHx/tHuzUszZxJjGCAgAwggH8AgEBMGwwVTENMAsGA1UE
ChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNhbXBsZSBMQU1Q
UyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzdBBXntdX9CqaJcOvT4as6a
qdcwCwYJYIZIAWUDBAIBoGkwGAYJKoZIhvcNAQkDMQsGCSqGSIb3DQEHATAcBgkq
hkiG9w0BCQUxDxcNMjEwMjIwMTcxNTAyWjAvBgkqhkiG9w0BCQQxIgQgzz6zrLzs
Pn86IlgrGm7Fheev5QucTU+VJZWxIIrBFk8wDQYJKoZIhvcNAQEBBQAEggEASITl
JnQGy7Cb5U6BdSMX3mnksCOX8mvaxy3o0QqNUbUGhNNPKI0LIWOdjHUL2Eq8+99Y
2+WvVn3ZkAJ7KF/89ja3u4NTiwu30wWsd7DL7t1z8DJBK6JuyaY4xtohUPVa2gL2
1atPowCt0X5RF7lmihqZnDGGUAzjfLpVsFnyIVAL3QG4/vW609d+aeO+ccdwzzUh
lE03h3qpHK9wX5pWBNZCfdmjdXUFacU+fMe1mG9I8A1HMY09zj+rNz3onoIHJWJ2
FBWS2tqK2eW8yCf/LSq9M5k86VbTjPjvjPz8FqupzugC5sUAx2JMUfUOq4A9hW+j
g8PEOcwaEeYOMdSeKw==

C.3.13.2. S/MIME Signed and Encrypted Reply Over a Complex Message, Header Protection With hcp_baseline, Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Subject: smime-signed-enc-complex-hp-baseline-reply
Message-ID: <smime-signed-enc-complex-hp-baseline-reply@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:15:02 -0500
User-Agent: Sample MUA Version 1.0
In-Reply-To: <smime-signed-enc-complex-hp-baseline@example>
References: <smime-signed-enc-complex-hp-baseline@example>
HP-Outer: Subject: [...]
HP-Outer: Message-ID:
 <smime-signed-enc-complex-hp-baseline-reply@example>
HP-Outer: From: Alice <alice@smime.example>
HP-Outer: To: Bob <bob@smime.example>
HP-Outer: Date: Sat, 20 Feb 2021 12:15:02 -0500
HP-Outer: User-Agent: Sample MUA Version 1.0
HP-Outer:
 In-Reply-To: <smime-signed-enc-complex-hp-baseline@example>
HP-Outer:
 References: <smime-signed-enc-complex-hp-baseline@example>
Content-Type: multipart/mixed; boundary="b2f"; hp="cipher"

--b2f
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="6e8"

--6e8
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

This is the
smime-signed-enc-complex-hp-baseline-reply
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_baseline Header Confidentiality Policy.

--
Alice
alice@smime.example
--6e8
Content-Type: text/html; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

<html><head><title></title></head><body>
<p>This is the
<b>smime-signed-enc-complex-hp-baseline-reply</b>
message.</p>
<p>This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_baseline Header Confidentiality Policy.</p>
<p><tt>-- <br/>Alice<br/>alice@smime.example</tt></p></body></html>
--6e8--

--b2f
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: inline

iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA
MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ
sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli
vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg==

--b2f--

C.3.14. S/MIME Signed and Encrypted Reply Over a Complex Message, Header Protection With hcp_baseline (+ Legacy Display)

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 11205 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 7278 bytes
  ⇩ (unwraps to)
  └┬╴multipart/mixed 2666 bytes
   ├┬╴multipart/alternative 1419 bytes
   │├─╴text/plain 478 bytes
   │└─╴text/html 638 bytes
   └─╴image/png inline 236 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID:
 <smime-signed-enc-complex-hp-baseline-lgc-rpl@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:16:02 -0500
User-Agent: Sample MUA Version 1.0
In-Reply-To:
 <smime-signed-enc-complex-hp-baseline-legacy@example>
References:
 <smime-signed-enc-complex-hp-baseline-legacy@example>

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lix5u2oy+nSU/EHwbayAtiLeSm6FVNxzr1AO99xgTDkm8OWxCpSjqznzWffI+uPq
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ZyE19pnIaF/p7tczePNgug==

C.3.14.1. S/MIME Signed and Encrypted Reply Over a Complex Message, Header Protection With hcp_baseline (+ Legacy Display), Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

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DsiLOQEP4YMS7y4q94RFFdmdzEbDLYx9sfUhvdTxDNOOoHz53PYDBh4zE4Nar2in
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czAfBgNVHSMEGDAWgBSRMI58BxcMp/EJKGU2GmccaHb0WTANBgkqhkiG9w0BAQ0F
AAOCAQEAc4miNqfOqaBpI3f+CpJDhxtuZ2P9HjQEQ+v6BdP7GKJ19naIs3BjJOd6
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wbqNsy9x0fjPQg6+DqatiQpMz9EIae6aCHHBhOiPU7IPkazgPYgkLD59fk4PGHnY
xs1FhdO6zZk9E8zwlc1ALgZa/iSbczisqckN3qGehD2s16jMhwFXLJtBiN+uCDgN
G/D0qyTbY4fgKieUHx/tHuzUszZxJjGCAgAwggH8AgEBMGwwVTENMAsGA1UEChME
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bEsl5q6WUySCAbgxotWkN7Ci2/Q7J9cwDQYJKoZIhvcNAQEBBQAEggEAiUGuCHAe
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aq6nGVcsoVTMIrH8nJv54eHQtWtYFBJI855oDbkIS4DxH0wR5121BayRN7MgC6q+
H+cJTAZUD2IF7Q==

C.3.14.2. S/MIME Signed and Encrypted Reply Over a Complex Message, Header Protection With hcp_baseline (+ Legacy Display), Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Subject: smime-signed-enc-complex-hp-baseline-lgc-rpl
Message-ID:
 <smime-signed-enc-complex-hp-baseline-lgc-rpl@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:16:02 -0500
User-Agent: Sample MUA Version 1.0
In-Reply-To:
 <smime-signed-enc-complex-hp-baseline-legacy@example>
References:
 <smime-signed-enc-complex-hp-baseline-legacy@example>
HP-Outer: Subject: [...]
HP-Outer: Message-ID:
 <smime-signed-enc-complex-hp-baseline-lgc-rpl@example>
HP-Outer: From: Alice <alice@smime.example>
HP-Outer: To: Bob <bob@smime.example>
HP-Outer: Date: Sat, 20 Feb 2021 12:16:02 -0500
HP-Outer: User-Agent: Sample MUA Version 1.0
HP-Outer: In-Reply-To:
 <smime-signed-enc-complex-hp-baseline-legacy@example>
HP-Outer: References:
 <smime-signed-enc-complex-hp-baseline-legacy@example>
Content-Type: multipart/mixed; boundary="63c"; hp="cipher"

--63c
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="802"

--802
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="us-ascii";
 hp-legacy-display="1"

Subject: smime-signed-enc-complex-hp-baseline-lgc-rpl

This is the
smime-signed-enc-complex-hp-baseline-lgc-rpl
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_baseline Header Confidentiality Policy with a
"Legacy Display" part.

--
Alice
alice@smime.example
--802
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/html; charset="us-ascii";
 hp-legacy-display="1"

<html><head><title></title></head><body>
<div class="header-protection-legacy-display">
<pre>
Subject: smime-signed-enc-complex-hp-baseline-lgc-rpl
</pre>
</div><p>This is the
<b>smime-signed-enc-complex-hp-baseline-lgc-rpl</b>
message.</p>
<p>This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_baseline Header Confidentiality Policy with a
"Legacy Display" part.</p>
<p><tt>-- <br>Alice<br>alice@smime.example</tt></p></body></html>
--802--

--63c
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: inline

iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA
MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ
sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli
vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg==

--63c--

C.3.15. S/MIME Signed and Encrypted Reply Over a Complex Message, Header Protection With hcp_shy

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 10445 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 6716 bytes
  ⇩ (unwraps to)
  └┬╴multipart/mixed 2273 bytes
   ├┬╴multipart/alternative 1116 bytes
   │├─╴text/plain 379 bytes
   │└─╴text/html 474 bytes
   └─╴image/png inline 236 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID: <smime-signed-enc-complex-hp-shy-reply@example>
From: alice@smime.example
To: bob@smime.example
Date: Sat, 20 Feb 2021 17:18:02 +0000
User-Agent: Sample MUA Version 1.0
In-Reply-To: <smime-signed-enc-complex-hp-shy@example>
References: <smime-signed-enc-complex-hp-shy@example>

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C.3.15.1. S/MIME Signed and Encrypted Reply Over a Complex Message, Header Protection With hcp_shy, Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

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C.3.15.2. S/MIME Signed and Encrypted Reply Over a Complex Message, Header Protection With hcp_shy, Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Subject: smime-signed-enc-complex-hp-shy-reply
Message-ID: <smime-signed-enc-complex-hp-shy-reply@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:18:02 -0500
User-Agent: Sample MUA Version 1.0
In-Reply-To: <smime-signed-enc-complex-hp-shy@example>
References: <smime-signed-enc-complex-hp-shy@example>
HP-Outer: Subject: [...]
HP-Outer:
 Message-ID: <smime-signed-enc-complex-hp-shy-reply@example>
HP-Outer: From: alice@smime.example
HP-Outer: To: bob@smime.example
HP-Outer: Date: Sat, 20 Feb 2021 17:18:02 +0000
HP-Outer: User-Agent: Sample MUA Version 1.0
HP-Outer: In-Reply-To: <smime-signed-enc-complex-hp-shy@example>
HP-Outer: References: <smime-signed-enc-complex-hp-shy@example>
Content-Type: multipart/mixed; boundary="46f"; hp="cipher"

--46f
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="fa5"

--fa5
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

This is the
smime-signed-enc-complex-hp-shy-reply
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_shy Header Confidentiality Policy.

--
Alice
alice@smime.example
--fa5
Content-Type: text/html; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

<html><head><title></title></head><body>
<p>This is the
<b>smime-signed-enc-complex-hp-shy-reply</b>
message.</p>
<p>This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_shy Header Confidentiality Policy.</p>
<p><tt>-- <br/>Alice<br/>alice@smime.example</tt></p></body></html>
--fa5--

--46f
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: inline

iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA
MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ
sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli
vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg==

--46f--

C.3.16. S/MIME Signed and Encrypted Reply Over a Complex Message, Header Protection With hcp_shy (+ Legacy Display)

It has the following structure:¶

└─╴application/pkcs7-mime [smime.p7m] 11505 bytes
 ↧ (decrypts to)
 └─╴application/pkcs7-mime [smime.p7m] 7508 bytes
  ⇩ (unwraps to)
  └┬╴multipart/mixed 2832 bytes
   ├┬╴multipart/alternative 1621 bytes
   │├─╴text/plain 576 bytes
   │└─╴text/html 748 bytes
   └─╴image/png inline 236 bytes

Its contents are:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="enveloped-data"
Subject: [...]
Message-ID:
 <smime-signed-enc-complex-hp-shy-legacy-reply@example>
From: alice@smime.example
To: bob@smime.example
Date: Sat, 20 Feb 2021 17:19:02 +0000
User-Agent: Sample MUA Version 1.0
In-Reply-To: <smime-signed-enc-complex-hp-shy-legacy@example>
References: <smime-signed-enc-complex-hp-shy-legacy@example>

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C.3.16.1. S/MIME Signed and Encrypted Reply Over a Complex Message, Header Protection With hcp_shy (+ Legacy Display), Decrypted

The S/MIME enveloped-data layer unwraps to this signed-data part:¶

Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-mime; name="smime.p7m";
 smime-type="signed-data"

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C.3.16.2. S/MIME Signed and Encrypted Reply Over a Complex Message, Header Protection With hcp_shy (+ Legacy Display), Decrypted and Unwrapped

The inner signed-data layer unwraps to:¶

MIME-Version: 1.0
Subject: smime-signed-enc-complex-hp-shy-legacy-reply
Message-ID:
 <smime-signed-enc-complex-hp-shy-legacy-reply@example>
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:19:02 -0500
User-Agent: Sample MUA Version 1.0
In-Reply-To: <smime-signed-enc-complex-hp-shy-legacy@example>
References: <smime-signed-enc-complex-hp-shy-legacy@example>
HP-Outer: Subject: [...]
HP-Outer: Message-ID:
 <smime-signed-enc-complex-hp-shy-legacy-reply@example>
HP-Outer: From: alice@smime.example
HP-Outer: To: bob@smime.example
HP-Outer: Date: Sat, 20 Feb 2021 17:19:02 +0000
HP-Outer: User-Agent: Sample MUA Version 1.0
HP-Outer:
 In-Reply-To: <smime-signed-enc-complex-hp-shy-legacy@example>
HP-Outer:
 References: <smime-signed-enc-complex-hp-shy-legacy@example>
Content-Type: multipart/mixed; boundary="d37"; hp="cipher"

--d37
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="d3e"

--d3e
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="us-ascii";
 hp-legacy-display="1"

Subject: smime-signed-enc-complex-hp-shy-legacy-reply
From: Alice <alice@smime.example>
To: Bob <bob@smime.example>
Date: Sat, 20 Feb 2021 12:19:02 -0500

This is the
smime-signed-enc-complex-hp-shy-legacy-reply
message.

This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_shy Header Confidentiality Policy with a "Legacy
Display" part.

--
Alice
alice@smime.example
--d3e
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/html; charset="us-ascii";
 hp-legacy-display="1"

<html><head><title></title></head><body>
<div class="header-protection-legacy-display">
<pre>
Subject: smime-signed-enc-complex-hp-shy-legacy-reply
From: Alice &lt;alice@smime.example&gt;
To: Bob &lt;bob@smime.example&gt;
Date: Sat, 20 Feb 2021 12:19:02 -0500
</pre>
</div><p>This is the
<b>smime-signed-enc-complex-hp-shy-legacy-reply</b>
message.</p>
<p>This is a signed-and-encrypted S/MIME message using PKCS#7
envelopedData around signedData.  The payload is a
multipart/alternative message with an inline image/png
attachment. It uses the Header Protection scheme from the draft
with the hcp_shy Header Confidentiality Policy with a "Legacy
Display" part.</p>
<p><tt>-- <br>Alice<br>alice@smime.example</tt></p></body></html>
--d3e--

--d37
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: inline

iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA
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vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg==

--d37--