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Obsoletes:
Keywords: [--------], block cipher, security, camellia, tls, cbc, sha2, camellia encryption algorithm
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]