AES Encryption with HMAC-SHA2 for Kerberos 5
draft-ietf-kitten-aes-cts-hmac-sha2-09

The information below is for an old version of the document
Document Type Active Internet-Draft (kitten WG)
Authors Michael Jenkins  , Michael Peck  , Kelley Burgin 
Last updated 2016-07-03 (latest revision 2016-01-26)
Replaces draft-ietf-kitten-aes-cbc-hmac-sha2
Stream IETF
Intended RFC status Informational
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Stream WG state Submitted to IESG for Publication
Document shepherd Benjamin Kaduk
Shepherd write-up Show (last changed 2016-06-26)
IESG IESG state Publication Requested
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Responsible AD Stephen Farrell
Send notices to "Benjamin Kaduk" <kaduk@mit.edu>
Network Working Group                                         M. Jenkins
Internet Draft                                  National Security Agency
Intended Status: Informational                                   M. Peck
Expires: July 28, 2016                             The MITRE Corporation
                                                               K. Burgin
                                                        January 25, 2016

              AES Encryption with HMAC-SHA2 for Kerberos 5
                 draft-ietf-kitten-aes-cts-hmac-sha2-09

Abstract

   This document specifies two encryption types and two corresponding
   checksum types for Kerberos 5.  The new types use AES in CTS mode
   (CBC mode with ciphertext stealing) for confidentiality and HMAC with
   a SHA-2 hash for integrity.

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
   Task Force (IETF).  Note that other groups may also distribute
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   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."

   This Internet-Draft will expire on July 28, 2016.

Copyright and License Notice

   Copyright (c) 2016 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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Internet-Draft      AES-CTS HMAC-SHA2 For Kerberos 5    January 25, 2016

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Protocol Key Representation  . . . . . . . . . . . . . . . . .  3
   3.  Key Derivation Function  . . . . . . . . . . . . . . . . . . .  3
   4.  Key Generation from Pass Phrases . . . . . . . . . . . . . . .  4
   5.  Kerberos Algorithm Protocol Parameters . . . . . . . . . . . .  5
   6.  Checksum Parameters  . . . . . . . . . . . . . . . . . . . . .  7
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  7
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . .  8
     8.1.  Random Values in Salt Strings  . . . . . . . . . . . . . .  8
     8.2.  Algorithm Rationale  . . . . . . . . . . . . . . . . . . .  9
   9.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  9
   10.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  9
     10.1.  Normative References  . . . . . . . . . . . . . . . . . .  9
     10.2.  Informative References  . . . . . . . . . . . . . . . . .  9
   Appendix A.  Test Vectors  . . . . . . . . . . . . . . . . . . . . 10
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 17

 

Jenkins, et al.          Expires July 28, 2016                  [Page 2]
Internet-Draft      AES-CTS HMAC-SHA2 For Kerberos 5    January 25, 2016

1.  Introduction

   This document defines two encryption types and two corresponding
   checksum types for Kerberos 5 using AES with 128-bit or 256-bit keys.

   To avoid ciphertext expansion, we use a variation of the CBC-CS3 mode
   defined in [SP800-38A+], also referred to as ciphertext stealing or
   CTS mode.  The new types conform to the framework specified in
   [RFC3961], but do not use the simplified profile.

   The encryption and checksum types defined in this document are
   intended to support environments that desire to use SHA-256 or SHA-
   384 as the hash algorithm.  Differences between the encryption and
   checksum types defined in this document and the pre-existing Kerberos
   AES encryption and checksum types specified in [RFC3962] are:

   *  The pseudorandom function used by PBKDF2 is HMAC-SHA-256 or HMAC-
      SHA-384.

   *  A key derivation function from [SP800-108] using the SHA-256 or
      SHA-384 hash algorithm is used to produce keys for encryption,
      integrity protection, and checksum operations.

   *  The HMAC is calculated over the cipherstate concatenated with the
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