Addition of the ARIA Cipher Suites to Transport Layer Security (TLS)
RFC 6209

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Internet Engineering Task Force (IETF)                            W. Kim
Request for Comments: 6209                                        J. Lee
Category: Informational                                          J. Park
ISSN: 2070-1721                                                  D. Kwon
                                                                    NSRI
                                                              April 2011

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

Abstract

   This document specifies a set of cipher suites for the Transport
   Layer Security (TLS) protocol to support the ARIA 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/rfc6209.

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
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   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.

Kim, et al.                   Informational                     [Page 1]
RFC 6209               ARIA Cipher Suites for TLS             April 2011

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 2
     1.1.  ARIA  . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Proposed Cipher Suites  . . . . . . . . . . . . . . . . . . . . 3
     2.1.  HMAC-Based Cipher Suites  . . . . . . . . . . . . . . . . . 3
     2.2.  GCM-Based Cipher Suites . . . . . . . . . . . . . . . . . . 3
     2.3.  PSK Cipher Suites . . . . . . . . . . . . . . . . . . . . . 4
   3.  Cipher Suite Definitions  . . . . . . . . . . . . . . . . . . . 5
     3.1.  Key Exchange  . . . . . . . . . . . . . . . . . . . . . . . 5
     3.2.  Cipher  . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     3.3.  PRFs  . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     3.4.  PSK Cipher Suites . . . . . . . . . . . . . . . . . . . . . 5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     6.1.  Normative References  . . . . . . . . . . . . . . . . . . . 7
     6.2.  Informative References  . . . . . . . . . . . . . . . . . . 8

1.  Introduction

   This document specifies cipher suites for the Transport Layer
   Security (TLS) [RFC5246] protocol to support the ARIA [RFC5794]
   encryption algorithm as a block cipher algorithm.  The cipher suites
   include variants using the SHA-2 family of cryptographic hash
   functions and ARIA Galois counter mode.  Elliptic curve cipher suites
   and pre-shared key (PSK) cipher suites are also defined.

   The cipher suites with SHA-1 are not included in this document.  Due
   to recent analytic work on SHA-1 [Wang05], the IETF is gradually
   moving away from SHA-1 and towards stronger hash algorithms.

1.1.  ARIA

   ARIA is a general-purpose block cipher algorithm developed by Korean
   cryptographers in 2003.  It is an iterated block cipher with 128-,
   192-, and 256-bit keys and encrypts 128-bit blocks in 12, 14, and 16
   rounds, depending on the key size.  It is secure and suitable for
   most software and hardware implementations on 32-bit and 8-bit
   processors.  It was established as a Korean standard block cipher
   algorithm in 2004 [ARIAKS] and has been widely used in Korea,
   especially for government-to-public services.  It was included in
   PKCS #11 in 2007 [ARIAPKCS].  The algorithm specification and object
   identifiers are described in [RFC5794].

Kim, et al.                   Informational                     [Page 2]
RFC 6209               ARIA Cipher Suites for TLS             April 2011

1.2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",