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Addition of the Camellia Cipher Suites to Transport Layer Security (TLS)
RFC 6367

Internet Engineering Task Force (IETF)                          S. Kanno
Request for Comments: 6367                      NTT Software Corporation
Category: Informational                                         M. Kanda
ISSN: 2070-1721                                                      NTT
                                                          September 2011

               Addition of the Camellia Cipher Suites to
                     Transport Layer Security (TLS)

Abstract

   This document specifies forty-two cipher suites for the Transport
   Security Layer (TLS) protocol to support the Camellia encryption
   algorithm as a block cipher.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc6367.

Copyright Notice

   Copyright (c) 2011 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.

Kanno & Kanda                 Informational                     [Page 1]
RFC 6367             Camellia Cipher Suites for TLS       September 2011

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . 2
   2.  Proposed Cipher Suites  . . . . . . . . . . . . . . . . . . . . 3
     2.1.  HMAC-Based Cipher Suites  . . . . . . . . . . . . . . . . . 3
     2.2.  GCM-Based Cipher Suites . . . . . . . . . . . . . . . . . . 3
     2.3.  PSK-Based Cipher Suites . . . . . . . . . . . . . . . . . . 4
   3.  Cipher Suite Definitions  . . . . . . . . . . . . . . . . . . . 4
     3.1.  Key Exchange  . . . . . . . . . . . . . . . . . . . . . . . 4
     3.2.  Cipher  . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     3.3.  PRFs  . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     3.4.  PSK Cipher Suites . . . . . . . . . . . . . . . . . . . . . 5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     6.1.  Normative References  . . . . . . . . . . . . . . . . . . . 6
     6.2.  Informative References  . . . . . . . . . . . . . . . . . . 7

1.  Introduction

   The Camellia cipher suites are already specified in RFC 5932 [15]
   with SHA-256-based Hashed Message Authentication Code (HMAC) using
   asymmetric key encryption.  This document proposes the addition of
   new cipher suites to the Transport Layer Security (TLS) [8] protocol
   to support the Camellia [4] cipher algorithm as a block cipher
   algorithm.  The proposed cipher suites include variants using the
   SHA-2 family of cryptographic hash functions [13] and Galois Counter
   Mode (GCM) [14].  Elliptic curve cipher suites and pre-shared key
   (PSK) [5] cipher suites are also included.

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 RFC 2119 [3].

Kanno & Kanda                 Informational                     [Page 2]
RFC 6367             Camellia Cipher Suites for TLS       September 2011

2.  Proposed Cipher Suites

2.1.  HMAC-Based Cipher Suites

   The eight cipher suites use Camellia [4] in Cipher Block Chaining
   (CBC) [4] mode with a SHA-2 family HMAC using the elliptic curve
   cryptosystem:

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