Camellia Cipher Suites for TLS
draft-kato-tls-rfc4132bis-04

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Abstract

This document specifies a set of cipher suites for the Transport Security Layer (TLS) protocol to support the Camellia encryption algorithm as a block cipher. It amends the ciphersuites originally specifed in RFC 4132 by counterparts using the newer cryptographic hash algorithms from the SHA-2 familiy. This document obsoletes RFC 4132.

1.  Introduction

This document proposes the addition of new cipher suites to the Transport Layer Security (TLS) [RFC5246] (Dierks, T. and E. Rescorla, “The Transport Layer Security (TLS) Protocol Version 1.2,” August 2008.) protocol to support the Camellia [RFC3713] (Matsui, M., Nakajima, J., and S. Moriai, “A Description of the Camellia Encryption Algorithm,” April 2004.) encryption algorithm as a block cipher algorithm, adding variants using the SHA-2 family of cryptographic hash algorithms [FIPS180‑3] (National Institute of Standards and Technology, “Secure Hash Standard (SHS),” October 2008.) to the TLS cipher suite portfolio originally specified in RFC 4132 [RFC4132] (Moriai, S., Kato, A., and M. Kanda, “Addition of Camellia Cipher Suites to Transport Layer Security (TLS),” July 2005.). This document obsoletes RFC 4132.

The algorithm specification and object identifiers are described in [RFC3713] (Matsui, M., Nakajima, J., and S. Moriai, “A Description of the Camellia Encryption Algorithm,” April 2004.).

1.1.  Terminology

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119] (Bradner, S., “Key words for use in RFCs to Indicate Requirement Levels,” March 1997.).

2.  Proposed Cipher Suites

The cipher suites defined here have the following identifiers:

  CipherSuite TLS_RSA_WITH_CAMELLIA_128_CBC_SHA         = { 0x00,0x41 };
  CipherSuite TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA      = { 0x00,0x42 };
  CipherSuite TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA      = { 0x00,0x43 };
  CipherSuite TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA     = { 0x00,0x44 };
  CipherSuite TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA     = { 0x00,0x45 };
  CipherSuite TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA     = { 0x00,0x46 };

  CipherSuite TLS_RSA_WITH_CAMELLIA_256_CBC_SHA         = { 0x00,0x84 };
  CipherSuite TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA      = { 0x00,0x85 };
  CipherSuite TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA      = { 0x00,0x86 };
  CipherSuite TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA     = { 0x00,0x87 };
  CipherSuite TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA     = { 0x00,0x88 };
  CipherSuite TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA     = { 0x00,0x89 };

  CipherSuite TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256      = { TBD,TBD };
  CipherSuite TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA256   = { TBD,TBD };
  CipherSuite TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA256   = { TBD,TBD };
  CipherSuite TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA256  = { TBD,TBD };
  CipherSuite TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256  = { TBD,TBD };
  CipherSuite TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA256  = { TBD,TBD };

  CipherSuite TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256      = { TBD,TBD };
  CipherSuite TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA256   = { TBD,TBD };
  CipherSuite TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA256   = { TBD,TBD };
  CipherSuite TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA256  = { TBD,TBD };
  CipherSuite TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256  = { TBD,TBD };
  CipherSuite TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA256  = { TBD,TBD };

3.  Cipher Suite Definitions

3.1.  Key Exchange

The RSA, DHE_RSA, DH_RSA, DHE_DSS, DH_DSS, and DH_anon key exchanges are performed as defined in [RFC5246] (Dierks, T. and E. Rescorla, “The Transport Layer Security (TLS) Protocol Version 1.2,” August 2008.).

3.2.  Cipher

The CAMELLIA_128_CBC cipher suites use Camellia [RFC3713] (Matsui, M., Nakajima, J., and S. Moriai, “A Description of the Camellia Encryption Algorithm,” April 2004.) in CBC mode with a 128-bit key and 128-bit IV; the CAMELLIA_256_CBC cipher suites use a 256-bit key and 128-bit IV.

3.3.  Hash and Pseudorandom Function

3.3.1.  Hash and Pseudorandom Function for TLS 1.1

The cipher suites ending with _SHA use HMAC-SHA1 as the MAC algorithm.

When used with TLS versions prior to 1.2, the PRF is calculated as specified in the appropriate version of the TLS specification.

3.3.2.  Hash and Pseudorandom Function for TLS 1.2

The cipher suites ending with _SHA256 use HMAC-SHA-256 as the MAC algorithm.

For TLS version 1.2, the PRF is the TLS PRF [RFC5246] (Dierks, T. and E. Rescorla, “The Transport Layer Security (TLS) Protocol Version 1.2,” August 2008.) with SHA-256 as the hash function.

The cipher suites ending with _SHA256 use HMAC-SHA-256 as the MAC algorithm. The PRF is the TLS PRF [RFC5246] (Dierks, T. and E. Rescorla, “The Transport Layer Security (TLS) Protocol Version 1.2,” August 2008.) with SHA-256 as the hash function. These cipher suites MUST NOT be negotiated by TLS 1.1 or earlier versions. Clients MUST NOT offer these cipher suites if they do not offer TLS 1.2 or later. Servers which select an earlier version of TLS MUST NOT select one of thse cipher suites.

4.  IANA Considerations

IANA has already allocated the following numbers for RFC 4132, and is requested to update them to reference this document:

  CipherSuite TLS_RSA_WITH_CAMELLIA_128_CBC_SHA         = { 0x00,0x41 };
  CipherSuite TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA      = { 0x00,0x42 };
  CipherSuite TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA      = { 0x00,0x43 };
  CipherSuite TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA     = { 0x00,0x44 };
  CipherSuite TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA     = { 0x00,0x45 };
  CipherSuite TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA     = { 0x00,0x46 };

  CipherSuite TLS_RSA_WITH_CAMELLIA_256_CBC_SHA         = { 0x00,0x84 };
  CipherSuite TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA      = { 0x00,0x85 };
  CipherSuite TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA      = { 0x00,0x86 };
  CipherSuite TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA     = { 0x00,0x87 };
  CipherSuite TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA     = { 0x00,0x88 };
  CipherSuite TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA     = { 0x00,0x89 };

IANA is requested to allocate (has allocated) the following numbers in the TLS Cipher Suite Registry:

 CipherSuite TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256      = { TBD,TBD };
 CipherSuite TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA256   = { TBD,TBD };
 CipherSuite TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA256   = { TBD,TBD };
 CipherSuite TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA256  = { TBD,TBD };
 CipherSuite TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256  = { TBD,TBD };
 CipherSuite TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA256  = { TBD,TBD };

 CipherSuite TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256      = { TBD,TBD };
 CipherSuite TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA256   = { TBD,TBD };
 CipherSuite TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA256   = { TBD,TBD };
 CipherSuite TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA256  = { TBD,TBD };
 CipherSuite TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256  = { TBD,TBD };
 CipherSuite TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA256  = { TBD,TBD };

5.  Security Considerations

At the time of writing this document, there are no known weak keys for Camellia.

Also, Security issues are discussed throughout RFC 5246 [RFC5246] (Dierks, T. and E. Rescorla, “The Transport Layer Security (TLS) Protocol Version 1.2,” August 2008.), especially in Appendices D, E, and F of [RFC5246] (Dierks, T. and E. Rescorla, “The Transport Layer Security (TLS) Protocol Version 1.2,” August 2008.).

6.  References

6.1. Normative References

6.2. Informative References

Authors' Addresses