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rfc:rfc5932

Internet Engineering Task Force (IETF) A. Kato Request for Comments: 5932 NTT Software Corporation Obsoletes: 4132 M. Kanda Category: Standards Track NTT ISSN: 2070-1721 S. Kanno

                                              NTT Software Corporation
                                                             June 2010
                   Camellia Cipher Suites for TLS

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 cipher suites originally
 specified in RFC 4132 by introducing counterparts using the newer
 cryptographic hash algorithms from the SHA-2 family.  This document
 obsoletes RFC 4132.

Status of This Memo

 This is an Internet Standards Track document.
 This document is a product of the Internet Engineering Task Force
 (IETF).  It represents the consensus of the IETF community.  It has
 received public review and has been approved for publication by the
 Internet Engineering Steering Group (IESG).  Further information on
 Internet Standards is available in Section 2 of RFC 5741.
 Information about the current status of this document, any errata,
 and how to provide feedback on it may be obtained at
 http://www.rfc-editor.org/info/rfc5932.

Copyright Notice

 Copyright (c) 2010 IETF Trust and the persons identified as the
 document authors.  All rights reserved.
 This document is subject to BCP 78 and the IETF Trust's Legal
 Provisions Relating to IETF Documents
 (http://trustee.ietf.org/license-info) in effect on the date of
 publication of this document.  Please review these documents
 carefully, as they describe your rights and restrictions with respect
 to this document.  Code Components extracted from this document must
 include Simplified BSD License text as described in Section 4.e of
 the Trust Legal Provisions and are provided without warranty as
 described in the Simplified BSD License.

Kato, et al. Standards Track [Page 1] RFC 5932 Camellia Cipher Suites for TLS June 2010

 This document may contain material from IETF Documents or IETF
 Contributions published or made publicly available before November
 10, 2008.  The person(s) controlling the copyright in some of this
 material may not have granted the IETF Trust the right to allow
 modifications of such material outside the IETF Standards Process.
 Without obtaining an adequate license from the person(s) controlling
 the copyright in such materials, this document may not be modified
 outside the IETF Standards Process, and derivative works of it may
 not be created outside the IETF Standards Process, except to format
 it for publication as an RFC or to translate it into languages other
 than English.

1. Introduction

 This document proposes the addition of new cipher suites to the
 Transport Layer Security (TLS) [RFC5246] protocol to support the
 Camellia [RFC3713] encryption algorithm as a block cipher algorithm,
 adding variants using the SHA-2 family of cryptographic hash
 algorithms [FIPS180-3] to the TLS cipher suite portfolio originally
 specified in RFC 4132 [RFC4132].  This document obsoletes RFC 4132.
 The Camellia algorithm and its properties are described in [RFC3713].

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].

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 };

Kato, et al. Standards Track [Page 2] RFC 5932 Camellia Cipher Suites for TLS June 2010

CipherSuite TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256      = { 0x00,0xBA };
CipherSuite TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA256   = { 0x00,0xBB };
CipherSuite TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA256   = { 0x00,0xBC };
CipherSuite TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA256  = { 0x00,0xBD };
CipherSuite TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256  = { 0x00,0xBE };
CipherSuite TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA256  = { 0x00,0xBF };
CipherSuite TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256      = { 0x00,0xC0 };
CipherSuite TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA256   = { 0x00,0xC1 };
CipherSuite TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA256   = { 0x00,0xC2 };
CipherSuite TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA256  = { 0x00,0xC3 };
CipherSuite TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256  = { 0x00,0xC4 };
CipherSuite TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA256  = { 0x00,0xC5 };

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].

3.2. Cipher

 The CAMELLIA_128_CBC cipher suites use Camellia [RFC3713] in Cipher
 Block Chaining (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 pseudorandom function
 (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.  The PRF is the TLS PRF [RFC5246] 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 that select an earlier
 version of TLS MUST NOT select one of these cipher suites.

Kato, et al. Standards Track [Page 3] RFC 5932 Camellia Cipher Suites for TLS June 2010

4. IANA Considerations

 IANA has updated the entries for the following numbers that were
 allocated in RFC 4132 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 has allocated the following numbers in the TLS Cipher Suite
 Registry:
CipherSuite TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256      = { 0x00,0xBA };
CipherSuite TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA256   = { 0x00,0xBB };
CipherSuite TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA256   = { 0x00,0xBC };
CipherSuite TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA256  = { 0x00,0xBD };
CipherSuite TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256  = { 0x00,0xBE };
CipherSuite TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA256  = { 0x00,0xBF };
CipherSuite TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256      = { 0x00,0xC0 };
CipherSuite TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA256   = { 0x00,0xC1 };
CipherSuite TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA256   = { 0x00,0xC2 };
CipherSuite TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA256  = { 0x00,0xC3 };
CipherSuite TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256  = { 0x00,0xC4 };
CipherSuite TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA256  = { 0x00,0xC5 };

Kato, et al. Standards Track [Page 4] RFC 5932 Camellia Cipher Suites for TLS June 2010

5. Security Considerations

 At the time of writing this document, there are no known weak keys
 for Camellia, and no security problem has been found on Camellia (see
 [NESSIE], [CRYPTREC], and [LNCS]).
 Also, security issues are discussed throughout RFC 5246 [RFC5246],
 especially in Appendices D, E, and F.

6. References

6.1. Normative References

 [FIPS180-3]  National Institute of Standards and Technology, "Secure
              Hash Standard (SHS)", FIPS PUB 180, October 2008,
              <http://csrc.nist.gov/publications/fips/fips180-3/
              fips180-3_final.pdf>.
 [RFC2119]    Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.
 [RFC3713]    Matsui, M., Nakajima, J., and S. Moriai, "A Description
              of the Camellia Encryption Algorithm", RFC 3713,
              April 2004.
 [RFC5246]    Dierks, T. and E. Rescorla, "The Transport Layer
              Security (TLS) Protocol Version 1.2", RFC 5246,
              August 2008.

6.2. Informative References

 [CRYPTREC]   Information-technology Promotion Agency (IPA),
              "Cryptography Research and Evaluation Committees",
              <http://www.ipa.go.jp/security/enc/CRYPTREC/
              index-e.html>.
 [LNCS]       Mala, H., Shakiba, M., and M. Dakhil-alian, "New Results
              on Impossible Differential Cryptanalysis of Reduced
              Round Camellia-128", LNCS 5867, November 2009,
              <http://www.springerlink.com/content/e55783u422436g77/>.
 [NESSIE]     "The NESSIE project (New European Schemes for
              Signatures, Integrity and Encryption)",
              <http://www.cosic.esat.kuleuven.be/nessie/>.
 [RFC4132]    Moriai, S., Kato, A., and M. Kanda, "Addition of
              Camellia Cipher Suites to Transport Layer Security
              (TLS)", RFC 4132, July 2005.

Kato, et al. Standards Track [Page 5] RFC 5932 Camellia Cipher Suites for TLS June 2010

Authors' Addresses

 Akihiro Kato
 NTT Software Corporation
 Phone: +81-45-212-9803
 Fax:   +81-45-212-9800
 EMail: kato.akihiro@po.ntts.co.jp
 Masayuki Kanda
 NTT
 Phone: +81-422-59-3456
 Fax:   +81-422-59-4015
 EMail: kanda.masayuki@lab.ntt.co.jp
 Satoru Kanno
 NTT Software Corporation
 Phone: +81-45-212-9803
 Fax:   +81-45-212-9800
 EMail: kanno.satoru@po.ntts.co.jp

Kato, et al. Standards Track [Page 6]

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