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
  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.





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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].






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1.2.  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

2.1.  HMAC-Based Cipher Suites

  The first twenty cipher suites use ARIA [RFC5794] in Cipher Block
  Chaining (CBC) mode with a SHA-2 family Hashed Message Authentication
  Code (HMAC).  Eight out of twenty use elliptic curves.

  CipherSuite TLS_RSA_WITH_ARIA_128_CBC_SHA256         = { 0xC0,0x3C };
  CipherSuite TLS_RSA_WITH_ARIA_256_CBC_SHA384         = { 0xC0,0x3D };
  CipherSuite TLS_DH_DSS_WITH_ARIA_128_CBC_SHA256      = { 0xC0,0x3E };
  CipherSuite TLS_DH_DSS_WITH_ARIA_256_CBC_SHA384      = { 0xC0,0x3F };
  CipherSuite TLS_DH_RSA_WITH_ARIA_128_CBC_SHA256      = { 0xC0,0x40 };
  CipherSuite TLS_DH_RSA_WITH_ARIA_256_CBC_SHA384      = { 0xC0,0x41 };
  CipherSuite TLS_DHE_DSS_WITH_ARIA_128_CBC_SHA256     = { 0xC0,0x42 };
  CipherSuite TLS_DHE_DSS_WITH_ARIA_256_CBC_SHA384     = { 0xC0,0x43 };
  CipherSuite TLS_DHE_RSA_WITH_ARIA_128_CBC_SHA256     = { 0xC0,0x44 };
  CipherSuite TLS_DHE_RSA_WITH_ARIA_256_CBC_SHA384     = { 0xC0,0x45 };
  CipherSuite TLS_DH_anon_WITH_ARIA_128_CBC_SHA256     = { 0xC0,0x46 };
  CipherSuite TLS_DH_anon_WITH_ARIA_256_CBC_SHA384     = { 0xC0,0x47 };

  CipherSuite TLS_ECDHE_ECDSA_WITH_ARIA_128_CBC_SHA256 = { 0xC0,0x48 };
  CipherSuite TLS_ECDHE_ECDSA_WITH_ARIA_256_CBC_SHA384 = { 0xC0,0x49 };
  CipherSuite TLS_ECDH_ECDSA_WITH_ARIA_128_CBC_SHA256  = { 0xC0,0x4A };
  CipherSuite TLS_ECDH_ECDSA_WITH_ARIA_256_CBC_SHA384  = { 0xC0,0x4B };
  CipherSuite TLS_ECDHE_RSA_WITH_ARIA_128_CBC_SHA256   = { 0xC0,0x4C };
  CipherSuite TLS_ECDHE_RSA_WITH_ARIA_256_CBC_SHA384   = { 0xC0,0x4D };
  CipherSuite TLS_ECDH_RSA_WITH_ARIA_128_CBC_SHA256    = { 0xC0,0x4E };
  CipherSuite TLS_ECDH_RSA_WITH_ARIA_256_CBC_SHA384    = { 0xC0,0x4F };

2.2.  GCM-Based Cipher Suites

  The next twenty cipher suites use the same asymmetric algorithms as
  those in the previous section but use the authenticated encryption
  modes defined in TLS 1.2 with the ARIA in Galois Counter Mode (GCM)
  [GCM].









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  CipherSuite TLS_RSA_WITH_ARIA_128_GCM_SHA256         = { 0xC0,0x50 };
  CipherSuite TLS_RSA_WITH_ARIA_256_GCM_SHA384         = { 0xC0,0x51 };
  CipherSuite TLS_DHE_RSA_WITH_ARIA_128_GCM_SHA256     = { 0xC0,0x52 };
  CipherSuite TLS_DHE_RSA_WITH_ARIA_256_GCM_SHA384     = { 0xC0,0x53 };
  CipherSuite TLS_DH_RSA_WITH_ARIA_128_GCM_SHA256      = { 0xC0,0x54 };
  CipherSuite TLS_DH_RSA_WITH_ARIA_256_GCM_SHA384      = { 0xC0,0x55 };
  CipherSuite TLS_DHE_DSS_WITH_ARIA_128_GCM_SHA256     = { 0xC0,0x56 };
  CipherSuite TLS_DHE_DSS_WITH_ARIA_256_GCM_SHA384     = { 0xC0,0x57 };
  CipherSuite TLS_DH_DSS_WITH_ARIA_128_GCM_SHA256      = { 0xC0,0x58 };
  CipherSuite TLS_DH_DSS_WITH_ARIA_256_GCM_SHA384      = { 0xC0,0x59 };
  CipherSuite TLS_DH_anon_WITH_ARIA_128_GCM_SHA256     = { 0xC0,0x5A };
  CipherSuite TLS_DH_anon_WITH_ARIA_256_GCM_SHA384     = { 0xC0,0x5B };

  CipherSuite TLS_ECDHE_ECDSA_WITH_ARIA_128_GCM_SHA256 = { 0xC0,0x5C };
  CipherSuite TLS_ECDHE_ECDSA_WITH_ARIA_256_GCM_SHA384 = { 0xC0,0x5D };
  CipherSuite TLS_ECDH_ECDSA_WITH_ARIA_128_GCM_SHA256  = { 0xC0,0x5E };
  CipherSuite TLS_ECDH_ECDSA_WITH_ARIA_256_GCM_SHA384  = { 0xC0,0x5F };
  CipherSuite TLS_ECDHE_RSA_WITH_ARIA_128_GCM_SHA256   = { 0xC0,0x60 };
  CipherSuite TLS_ECDHE_RSA_WITH_ARIA_256_GCM_SHA384   = { 0xC0,0x61 };
  CipherSuite TLS_ECDH_RSA_WITH_ARIA_128_GCM_SHA256    = { 0xC0,0x62 };
  CipherSuite TLS_ECDH_RSA_WITH_ARIA_256_GCM_SHA384    = { 0xC0,0x63 };

2.3.  PSK Cipher Suites

  The next fourteen cipher suites describe PSK cipher suites.  Eight
  cipher suites use an HMAC and six cipher suites use the ARIA Galois
  Counter Mode.

  CipherSuite TLS_PSK_WITH_ARIA_128_CBC_SHA256         = { 0xC0,0x64 };
  CipherSuite TLS_PSK_WITH_ARIA_256_CBC_SHA384         = { 0xC0,0x65 };
  CipherSuite TLS_DHE_PSK_WITH_ARIA_128_CBC_SHA256     = { 0xC0,0x66 };
  CipherSuite TLS_DHE_PSK_WITH_ARIA_256_CBC_SHA384     = { 0xC0,0x67 };
  CipherSuite TLS_RSA_PSK_WITH_ARIA_128_CBC_SHA256     = { 0xC0,0x68 };
  CipherSuite TLS_RSA_PSK_WITH_ARIA_256_CBC_SHA384     = { 0xC0,0x69 };
  CipherSuite TLS_PSK_WITH_ARIA_128_GCM_SHA256         = { 0xC0,0x6A };
  CipherSuite TLS_PSK_WITH_ARIA_256_GCM_SHA384         = { 0xC0,0x6B };
  CipherSuite TLS_DHE_PSK_WITH_ARIA_128_GCM_SHA256     = { 0xC0,0x6C };
  CipherSuite TLS_DHE_PSK_WITH_ARIA_256_GCM_SHA384     = { 0xC0,0x6D };
  CipherSuite TLS_RSA_PSK_WITH_ARIA_128_GCM_SHA256     = { 0xC0,0x6E };
  CipherSuite TLS_RSA_PSK_WITH_ARIA_256_GCM_SHA384     = { 0xC0,0x6F };
  CipherSuite TLS_ECDHE_PSK_WITH_ARIA_128_CBC_SHA256   = { 0xC0,0x70 };
  CipherSuite TLS_ECDHE_PSK_WITH_ARIA_256_CBC_SHA384   = { 0xC0,0x71 };









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3.  Cipher Suite Definitions

3.1.  Key Exchange

  The RSA, DHE_RSA, DH_RSA, DHE_DSS, DH_DSS, DH_anon, ECDH, and ECDHE
  key exchanges are performed as defined in [RFC5246].

3.2.  Cipher

  The ARIA_128_CBC cipher suites use ARIA [RFC5794] in CBC mode with a
  128-bit key and 128-bit Initialization Vector (IV); the ARIA_256_CBC
  cipher suites use a 256-bit key and 128-bit IV.

  AES-authenticated encryption with additional data algorithms,
  AEAD_AES_128_GCM, and AEAD_AES_256_GCM are described in [RFC5116].
  AES GCM cipher suites for TLS are described in [RFC5288].  AES and
  ARIA share common characteristics, including key sizes and block
  length.  ARIA_128_GCM and ARIA_256_GCM are defined according to those
  characteristics of AES.

3.3.  PRFs

  The pseudorandom functions (PRFs) SHALL be as follows:

  a.  For cipher suites ending with _SHA256, the PRF is the TLS PRF
      [RFC5246] using SHA-256 as the hash function.

  b.  For cipher suites ending with _SHA384, the PRF is the TLS PRF
      [RFC5246] using SHA-384 as the hash function.

3.4.  PSK Cipher Suites

  Pre-shared key cipher suites for TLS are described in [RFC4279],
  [RFC4785], [RFC5487], and [RFC5489].

4.  Security Considerations

  At the time of writing this document, no security problems have been
  found on ARIA (see [YWL]).

  The security considerations in the following RFCs apply to this
  document as well: [RFC4279] [RFC4785] [RFC5116] [RFC5288] [RFC5289]
  [RFC5487] and [GCM].








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5.  IANA Considerations

  IANA has allocated the following numbers in the TLS Cipher Suite
  Registry:

  CipherSuite TLS_RSA_WITH_ARIA_128_CBC_SHA256         = { 0xC0,0x3C };
  CipherSuite TLS_RSA_WITH_ARIA_256_CBC_SHA384         = { 0xC0,0x3D };
  CipherSuite TLS_DH_DSS_WITH_ARIA_128_CBC_SHA256      = { 0xC0,0x3E };
  CipherSuite TLS_DH_DSS_WITH_ARIA_256_CBC_SHA384      = { 0xC0,0x3F };
  CipherSuite TLS_DH_RSA_WITH_ARIA_128_CBC_SHA256      = { 0xC0,0x40 };
  CipherSuite TLS_DH_RSA_WITH_ARIA_256_CBC_SHA384      = { 0xC0,0x41 };
  CipherSuite TLS_DHE_DSS_WITH_ARIA_128_CBC_SHA256     = { 0xC0,0x42 };
  CipherSuite TLS_DHE_DSS_WITH_ARIA_256_CBC_SHA384     = { 0xC0,0x43 };
  CipherSuite TLS_DHE_RSA_WITH_ARIA_128_CBC_SHA256     = { 0xC0,0x44 };
  CipherSuite TLS_DHE_RSA_WITH_ARIA_256_CBC_SHA384     = { 0xC0,0x45 };
  CipherSuite TLS_DH_anon_WITH_ARIA_128_CBC_SHA256     = { 0xC0,0x46 };
  CipherSuite TLS_DH_anon_WITH_ARIA_256_CBC_SHA384     = { 0xC0,0x47 };

  CipherSuite TLS_ECDHE_ECDSA_WITH_ARIA_128_CBC_SHA256 = { 0xC0,0x48 };
  CipherSuite TLS_ECDHE_ECDSA_WITH_ARIA_256_CBC_SHA384 = { 0xC0,0x49 };
  CipherSuite TLS_ECDH_ECDSA_WITH_ARIA_128_CBC_SHA256  = { 0xC0,0x4A };
  CipherSuite TLS_ECDH_ECDSA_WITH_ARIA_256_CBC_SHA384  = { 0xC0,0x4B };
  CipherSuite TLS_ECDHE_RSA_WITH_ARIA_128_CBC_SHA256   = { 0xC0,0x4C };
  CipherSuite TLS_ECDHE_RSA_WITH_ARIA_256_CBC_SHA384   = { 0xC0,0x4D };
  CipherSuite TLS_ECDH_RSA_WITH_ARIA_128_CBC_SHA256    = { 0xC0,0x4E };
  CipherSuite TLS_ECDH_RSA_WITH_ARIA_256_CBC_SHA384    = { 0xC0,0x4F };

  CipherSuite TLS_RSA_WITH_ARIA_128_GCM_SHA256         = { 0xC0,0x50 };
  CipherSuite TLS_RSA_WITH_ARIA_256_GCM_SHA384         = { 0xC0,0x51 };
  CipherSuite TLS_DHE_RSA_WITH_ARIA_128_GCM_SHA256     = { 0xC0,0x52 };
  CipherSuite TLS_DHE_RSA_WITH_ARIA_256_GCM_SHA384     = { 0xC0,0x53 };
  CipherSuite TLS_DH_RSA_WITH_ARIA_128_GCM_SHA256      = { 0xC0,0x54 };
  CipherSuite TLS_DH_RSA_WITH_ARIA_256_GCM_SHA384      = { 0xC0,0x55 };
  CipherSuite TLS_DHE_DSS_WITH_ARIA_128_GCM_SHA256     = { 0xC0,0x56 };
  CipherSuite TLS_DHE_DSS_WITH_ARIA_256_GCM_SHA384     = { 0xC0,0x57 };
  CipherSuite TLS_DH_DSS_WITH_ARIA_128_GCM_SHA256      = { 0xC0,0x58 };
  CipherSuite TLS_DH_DSS_WITH_ARIA_256_GCM_SHA384      = { 0xC0,0x59 };
  CipherSuite TLS_DH_anon_WITH_ARIA_128_GCM_SHA256     = { 0xC0,0x5A };
  CipherSuite TLS_DH_anon_WITH_ARIA_256_GCM_SHA384     = { 0xC0,0x5B };

  CipherSuite TLS_ECDHE_ECDSA_WITH_ARIA_128_GCM_SHA256 = { 0xC0,0x5C };
  CipherSuite TLS_ECDHE_ECDSA_WITH_ARIA_256_GCM_SHA384 = { 0xC0,0x5D };
  CipherSuite TLS_ECDH_ECDSA_WITH_ARIA_128_GCM_SHA256  = { 0xC0,0x5E };
  CipherSuite TLS_ECDH_ECDSA_WITH_ARIA_256_GCM_SHA384  = { 0xC0,0x5F };
  CipherSuite TLS_ECDHE_RSA_WITH_ARIA_128_GCM_SHA256   = { 0xC0,0x60 };
  CipherSuite TLS_ECDHE_RSA_WITH_ARIA_256_GCM_SHA384   = { 0xC0,0x61 };
  CipherSuite TLS_ECDH_RSA_WITH_ARIA_128_GCM_SHA256    = { 0xC0,0x62 };
  CipherSuite TLS_ECDH_RSA_WITH_ARIA_256_GCM_SHA384    = { 0xC0,0x63 };



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  CipherSuite TLS_PSK_WITH_ARIA_128_CBC_SHA256         = { 0xC0,0x64 };
  CipherSuite TLS_PSK_WITH_ARIA_256_CBC_SHA384         = { 0xC0,0x65 };
  CipherSuite TLS_DHE_PSK_WITH_ARIA_128_CBC_SHA256     = { 0xC0,0x66 };
  CipherSuite TLS_DHE_PSK_WITH_ARIA_256_CBC_SHA384     = { 0xC0,0x67 };
  CipherSuite TLS_RSA_PSK_WITH_ARIA_128_CBC_SHA256     = { 0xC0,0x68 };
  CipherSuite TLS_RSA_PSK_WITH_ARIA_256_CBC_SHA384     = { 0xC0,0x69 };
  CipherSuite TLS_PSK_WITH_ARIA_128_GCM_SHA256         = { 0xC0,0x6A };
  CipherSuite TLS_PSK_WITH_ARIA_256_GCM_SHA384         = { 0xC0,0x6B };
  CipherSuite TLS_DHE_PSK_WITH_ARIA_128_GCM_SHA256     = { 0xC0,0x6C };
  CipherSuite TLS_DHE_PSK_WITH_ARIA_256_GCM_SHA384     = { 0xC0,0x6D };
  CipherSuite TLS_RSA_PSK_WITH_ARIA_128_GCM_SHA256     = { 0xC0,0x6E };
  CipherSuite TLS_RSA_PSK_WITH_ARIA_256_GCM_SHA384     = { 0xC0,0x6F };
  CipherSuite TLS_ECDHE_PSK_WITH_ARIA_128_CBC_SHA256   = { 0xC0,0x70 };
  CipherSuite TLS_ECDHE_PSK_WITH_ARIA_256_CBC_SHA384   = { 0xC0,0x71 };

6.  References

6.1.  Normative References

  [GCM]       Dworkin, M., "Recommendation for Block Cipher Modes of
              Operation: Galois/Counter Mode (GCM) and GMAC", NIST
              SP 800-38D, November 2007.

  [RFC2119]   Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

  [RFC4279]   Eronen, P. and H. Tschofenig, "Pre-Shared Key
              Ciphersuites for Transport Layer Security (TLS)",
              RFC 4279, December 2005.

  [RFC4785]   Blumenthal, U. and P. Goel, "Pre-Shared Key (PSK)
              Ciphersuites with NULL Encryption for Transport Layer
              Security (TLS)", RFC 4785, January 2007.

  [RFC5116]   McGrew, D., "An Interface and Algorithms for
              Authenticated Encryption", RFC 5116, January 2008.

  [RFC5246]   Dierks, T. and E. Rescorla, "The Transport Layer Security
              (TLS) Protocol Version 1.2", RFC 5246, August 2008.

  [RFC5288]   Salowey, J., Choudhury, A., and D. McGrew, "AES Galois
              Counter Mode (GCM) Cipher Suites for TLS", RFC 5288,
              August 2008.

  [RFC5289]   Rescorla, E., "TLS Elliptic Curve Cipher Suites with SHA-
              256/384 and AES Galois Counter Mode (GCM)", RFC 5289,
              August 2008.




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  [RFC5487]   Badra, M., "Pre-Shared Key Cipher Suites for TLS with
              SHA-256/384 and AES Galois Counter Mode", RFC 5487,
              March 2009.

  [RFC5489]   Badra, M. and I. Hajjeh, "ECDHE_PSK Cipher Suites for
              Transport Layer Security (TLS)", RFC 5489, March 2009.

  [RFC5794]   Lee, J., Lee, J., Kim, J., Kwon, D., and C. Kim, "A
              Description of the ARIA Encryption Algorithm", RFC 5794,
              March 2010.

6.2.  Informative References

  [ARIAKS]    Korean Agency for Technology and Standards, "128 bit
              block encryption algorithm ARIA - Part 1: General (in
              Korean)", KS X 1213-1:2009, December 2009.

  [ARIAPKCS]  RSA Laboratories, "Additional PKCS #11 Mechanisms",
              PKCS #11 v2.20 Amendment 3 Revision 1, January 2007.

  [Wang05]    Wang, X., Yin, Y., and H. Yu, "Finding Collisions in the
              Full SHA-1", CRYPTO 2005, LNCS vol.3621, pp.17-36,
              August 2005.

  [YWL]       Li, Y., Wu, W., and L. Zhang, "Integral attacks on
              reduced-round ARIA block cipher", ISPEC 2010,
              LNCS Vol.6047, pp. 19-29, May 2010.
























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Authors' Addresses

  Woo-Hwan Kim
  National Security Research Institute
  P.O.Box 1, Yuseong
  Daejeon  305-350
  Korea

  EMail: [email protected]


  Jungkeun Lee
  National Security Research Institute
  P.O.Box 1, Yuseong
  Daejeon  305-350
  Korea

  EMail: [email protected]


  Je-Hong Park
  National Security Research Institute
  P.O.Box 1, Yuseong
  Daejeon  305-350
  Korea

  EMail: [email protected]


  Daesung Kwon
  National Security Research Institute
  P.O.Box 1, Yuseong
  Daejeon  305-350
  Korea

  EMail: [email protected]















Kim, et al.                   Informational                     [Page 9]


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