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+Network Working Group                                        E. Rescorla
+Internet-Draft                                                RTFM, Inc.
+Intended status:  Informational                              May 9, 2008
+Expires:  November 10, 2008
+
+
+TLS Elliptic Curve Cipher Suites with SHA-256/384 and AES Galois Counter
+                                  Mode
+                   draft-ietf-tls-ecc-new-mac-07.txt
+
+Status of this Memo
+
+   By submitting this Internet-Draft, each author represents that any
+   applicable patent or other IPR claims of which he or she is aware
+   have been or will be disclosed, and any of which he or she becomes
+   aware will be disclosed, in accordance with Section 6 of BCP 79.
+
+   Internet-Drafts are working documents of the Internet Engineering
+   Task Force (IETF), its areas, and its working groups.  Note that
+   other groups may also distribute working documents as Internet-
+   Drafts.
+
+   Internet-Drafts are draft documents valid for a maximum of six months
+   and may be updated, replaced, or obsoleted by other documents at any
+   time.  It is inappropriate to use Internet-Drafts as reference
+   material or to cite them other than as "work in progress."
+
+   The list of current Internet-Drafts can be accessed at
+   http://www.ietf.org/ietf/1id-abstracts.txt.
+
+   The list of Internet-Draft Shadow Directories can be accessed at
+   http://www.ietf.org/shadow.html.
+
+   This Internet-Draft will expire on November 10, 2008.
+
+Copyright Notice
+
+   Copyright (C) The IETF Trust (2008).
+
+Abstract
+
+   RFC 4492 describes elliptic curve cipher suites for Transport Layer
+   Security (TLS).  However, all those cipher suites use SHA-1 as their
+   MAC algorithm.  This document describes sixteen new cipher suites for
+   TLS which specify stronger digest algorithms.  Eight use HMAC with
+   SHA-256 or SHA-384 and eight use AES in Galois Counter Mode (GCM).
+
+
+
+
+
+Rescorla                Expires November 10, 2008               [Page 1]
+
+Internet-Draft               TLS ECC New MAC                    May 2008
+
+
+Table of Contents
+
+   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
+   2.  Conventions Used In This Document . . . . . . . . . . . . . . . 3
+   3.  Cipher Suites . . . . . . . . . . . . . . . . . . . . . . . . . 3
+     3.1.  HMAC-based Cipher Suites  . . . . . . . . . . . . . . . . . 3
+     3.2.  Galois Counter Mode-based Cipher Suites . . . . . . . . . . 4
+   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
+   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
+   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 5
+   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 5
+     7.1.  Normative References  . . . . . . . . . . . . . . . . . . . 5
+     7.2.  Informative References  . . . . . . . . . . . . . . . . . . 6
+   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 6
+   Intellectual Property and Copyright Statements  . . . . . . . . . . 7
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+Rescorla                Expires November 10, 2008               [Page 2]
+
+Internet-Draft               TLS ECC New MAC                    May 2008
+
+
+1.  Introduction
+
+   RFC 4492 [RFC4492] describes Elliptic Curve Cryptography (ECC) cipher
+   suites for Transport Layer Security (TLS).  However, all of the RFC
+   4492 suites use HMAC-SHA1 as their MAC algorithm.  Due to recent
+   analytic work on SHA-1 [Wang05], the IETF is gradually moving away
+   from SHA-1 and towards stronger hash algorithms.  This document
+   specifies TLS ECC cipher suites which use SHA-256 and SHA-384 [SHS]
+   rather than SHA-1.
+
+   TLS 1.2 [I-D.ietf-tls-rfc4346-bis], adds support for authenticated
+   encryption with additional data (AEAD) cipher modes [RFC5116].  This
+   document also specifies a set of ECC cipher suites using one such
+   mode, Galois Counter Mode (GCM) [GCM].  Another document
+   [I-D.ietf-tls-rsa-aes-gcm], provides support for GCM with other key
+   establishment methods.
+
+
+2.  Conventions Used In This Document
+
+   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].
+
+
+3.  Cipher Suites
+
+   This document defines 16 new cipher suites to be added to TLS.  All
+   use Elliptic Curve Cryptography for key exchange and digital
+   signature, as defined in RFC 4492.
+
+3.1.  HMAC-based Cipher Suites
+
+   The first eight cipher suites use AES [AES] in CBC [CBC] mode with an
+   HMAC-based MAC:
+
+       CipherSuite TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256  = {0xXX,XX};
+       CipherSuite TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384  = {0xXX,XX};
+       CipherSuite TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256   = {0xXX,XX};
+       CipherSuite TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384   = {0xXX,XX};
+       CipherSuite TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256    = {0xXX,XX};
+       CipherSuite TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384    = {0xXX,XX};
+       CipherSuite TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256     = {0xXX,XX};
+       CipherSuite TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384     = {0xXX,XX};
+
+   These eight cipher suites are the same as the corresponding cipher
+   suites in RFC 4492 (with names ending in "_SHA" in place of "_SHA256"
+   or "_SHA384"), except for the hash and PRF algorithms.
+
+
+
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+
+
+   These SHALL be as follows:
+
+   o  For cipher suites ending with _SHA256, the PRF is the TLS PRF
+      [I-D.ietf-tls-rfc4346-bis] with SHA-256 as the hash function.  The
+      MAC is HMAC [RFC2104] with SHA-256 as the hash function.
+   o  For cipher suites ending with _SHA384, the PRF is the TLS PRF
+      [I-D.ietf-tls-rfc4346-bis] with SHA-384 as the hash function.  The
+      MAC is HMAC [RFC2104] with SHA-384 as the hash function.
+
+3.2.  Galois Counter Mode-based Cipher Suites
+
+   The second eight cipher suites use the same asymmetric algorithms as
+   those in the previous section but use the new authenticated
+   encryption modes defined in TLS 1.2 with AES in Galois Counter Mode
+   (GCM) [GCM]:
+
+       CipherSuite TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256  = {0xXX,XX};
+       CipherSuite TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384  = {0xXX,XX};
+       CipherSuite TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256   = {0xXX,XX};
+       CipherSuite TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384   = {0xXX,XX};
+       CipherSuite TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256    = {0xXX,XX};
+       CipherSuite TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384    = {0xXX,XX};
+       CipherSuite TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256     = {0xXX,XX};
+       CipherSuite TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384     = {0xXX,XX};
+
+   These cipher suites use authenticated encryption with additional data
+   algorithms AEAD_AES_128_GCM and AEAD_AES_256_GCM described in
+   [RFC5116].  GCM is used as described in [I-D.ietf-tls-rsa-aes-gcm].
+
+   The PRFs SHALL be as follows:
+
+   o  For cipher suites ending with _SHA256, the PRF is the TLS PRF
+      [I-D.ietf-tls-rfc4346-bis] with SHA-256 as the hash function.
+   o  For cipher suites ending with _SHA384, the PRF is the TLS PRF
+      [I-D.ietf-tls-rfc4346-bis] with SHA-384 as the hash function.
+
+
+4.  Security Considerations
+
+   The security considerations in RFC 4346, RFC 4492, and
+   [I-D.ietf-tls-rsa-aes-gcm] apply to this document as well.  In
+   addition, as described in [I-D.ietf-tls-rsa-aes-gcm], these cipher
+   suites may only be used with TLS 1.2 or greater.
+
+
+5.  IANA Considerations
+
+   IANA has assigned the following values for these cipher suites:
+
+
+
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+
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+       CipherSuite TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256  = {0xXX,XX};
+       CipherSuite TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384  = {0xXX,XX};
+       CipherSuite TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256   = {0xXX,XX};
+       CipherSuite TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384   = {0xXX,XX};
+       CipherSuite TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256    = {0xXX,XX};
+       CipherSuite TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384    = {0xXX,XX};
+       CipherSuite TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256     = {0xXX,XX};
+       CipherSuite TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384     = {0xXX,XX};
+       CipherSuite TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256  = {0xXX,XX};
+       CipherSuite TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384  = {0xXX,XX};
+       CipherSuite TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256   = {0xXX,XX};
+       CipherSuite TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384   = {0xXX,XX};
+       CipherSuite TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256    = {0xXX,XX};
+       CipherSuite TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384    = {0xXX,XX};
+       CipherSuite TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256     = {0xXX,XX};
+       CipherSuite TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384     = {0xXX,XX};
+
+
+6.  Acknowledgements
+
+   This work was supported by the US Department of Defense.
+
+   David McGrew, Pasi Eronen, and Alfred Hoenes provided reviews of this
+   document.
+
+
+7.  References
+
+7.1.  Normative References
+
+   [RFC2104]  Krawczyk, H., Bellare, M., and R. Canetti, "HMAC: Keyed-
+              Hashing for Message Authentication", RFC 2104,
+              February 1997.
+
+   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
+              Requirement Levels", BCP 14, RFC 2119, March 1997.
+
+   [RFC4492]  Blake-Wilson, S., Bolyard, N., Gupta, V., Hawk, C., and B.
+              Moeller, "Elliptic Curve Cryptography (ECC) Cipher Suites
+              for Transport Layer Security (TLS)", RFC 4492, May 2006.
+
+   [RFC5116]  McGrew, D., "An Interface and Algorithms for Authenticated
+              Encryption", RFC 5116, January 2008.
+
+   [I-D.ietf-tls-rfc4346-bis]
+              Dierks, T. and E. Rescorla, "The Transport Layer Security
+              (TLS) Protocol Version 1.2", draft-ietf-tls-rfc4346-bis-10
+              (work in progress), March 2008.
+
+
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+
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+   [I-D.ietf-tls-rsa-aes-gcm]
+              Salowey, J., Choudhury, A., and D. McGrew, "AES-GCM Cipher
+              Suites for TLS", draft-ietf-tls-rsa-aes-gcm-03 (work in
+              progress), April 2008.
+
+   [AES]      National Institute of Standards and Technology,
+              "Specification for the Advanced Encryption Standard
+              (AES)", FIPS 197, November 2001.
+
+   [SHS]      National Institute of Standards and Technology, "Secure
+              Hash Standard", FIPS 180-2, August 2002.
+
+   [CBC]      National Institute of Standards and Technology,
+              "Recommendation for Block Cipher Modes of Operation -
+              Methods and Techniques", SP 800-38A, December 2001.
+
+   [GCM]      National Institute of Standards and Technology,
+              "Recommendation for Block Cipher Modes of Operation:
+              Galois/Counter Mode (GCM) for Confidentiality and
+              Authentication", SP 800-38D, November 2007.
+
+7.2.  Informative References
+
+   [Wang05]   Wang, X., Yin, Y., and H. Yu, "Finding Collisions in the
+              Full SHA-1", CRYPTO 2005, August 2005.
+
+
+Author's Address
+
+   Eric Rescorla
+   RTFM, Inc.
+   2064 Edgewood Drive
+   Palo Alto  94303
+   USA
+
+   Email:  ekr@rtfm.com
+
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+Rescorla                Expires November 10, 2008               [Page 6]
+
+Internet-Draft               TLS ECC New MAC                    May 2008
+
+
+Full Copyright Statement
+
+   Copyright (C) The IETF Trust (2008).
+
+   This document is subject to the rights, licenses and restrictions
+   contained in BCP 78, and except as set forth therein, the authors
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+Acknowledgment
+
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+Rescorla                Expires November 10, 2008               [Page 7]
+