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Authenticated Encryption with AES-CBC and HMAC-SHA
draft-mcgrew-aead-aes-cbc-hmac-sha2-05

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Last updated: 2014-07-04
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Network Working Group                                          D. McGrew
Internet-Draft                                                  J. Foley
Intended status: Standards Track                           Cisco Systems
Expires: January 5, 2015                                     K. Paterson
                                           Royal Holloway, University of
                                                                  London
                                                            July 4, 2014

           Authenticated Encryption with AES-CBC and HMAC-SHA
               draft-mcgrew-aead-aes-cbc-hmac-sha2-05.txt

Abstract

   This document specifies algorithms for authenticated encryption with
   associated data (AEAD) that are based on the composition of the
   Advanced Encryption Standard (AES) in the Cipher Block Chaining (CBC)
   mode of operation for encryption, and the HMAC-SHA message
   authentication code (MAC).

   These are randomized encryption algorithms, and thus are suitable for
   use with applications that cannot provide distinct nonces to each
   invocation of the AEAD encrypt operation.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on January 5, 2015.

Copyright Notice

   Copyright (c) 2014 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

McGrew, et al.           Expires January 5, 2015                [Page 1]
Internet-Draft            AEAD-AES-CBC-HMAC-SHA                July 2014

   (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
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  History  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.2.  Conventions Used In This Document  . . . . . . . . . . . .  4
   2.  CBC-HMAC algorithms  . . . . . . . . . . . . . . . . . . . . .  5
     2.1.  Encryption . . . . . . . . . . . . . . . . . . . . . . . .  5
     2.2.  Decryption . . . . . . . . . . . . . . . . . . . . . . . .  7
     2.3.  Length . . . . . . . . . . . . . . . . . . . . . . . . . .  8
     2.4.  AEAD_AES_128_CBC_HMAC_SHA_256  . . . . . . . . . . . . . .  8
     2.5.  AEAD_AES_192_CBC_HMAC_SHA_384  . . . . . . . . . . . . . .  9
     2.6.  AEAD_AES_256_CBC_HMAC_SHA_384  . . . . . . . . . . . . . .  9
     2.7.  AEAD_AES_256_CBC_HMAC_SHA_512  . . . . . . . . . . . . . . 10
     2.8.  Summary  . . . . . . . . . . . . . . . . . . . . . . . . . 10
   3.  Randomness Requirements  . . . . . . . . . . . . . . . . . . . 11
   4.  Rationale  . . . . . . . . . . . . . . . . . . . . . . . . . . 12
   5.  Test Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     5.1.  AEAD_AES_128_CBC_HMAC_SHA256 . . . . . . . . . . . . . . . 14
     5.2.  AEAD_AES_192_CBC_HMAC_SHA384 . . . . . . . . . . . . . . . 16
     5.3.  AEAD_AES_256_CBC_HMAC_SHA384 . . . . . . . . . . . . . . . 18
     5.4.  AEAD_AES_256_CBC_HMAC_SHA512 . . . . . . . . . . . . . . . 20
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 22
   7.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 24
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 25
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 25
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 25
   Appendix A.  CBC Encryption and Decryption . . . . . . . . . . . . 28
   Appendix B.  Alternative Interface for Legacy Encoding . . . . . . 30
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 31

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