SHA-2 Data Integrity Verification for the Secure Shell (SSH) Transport Layer Protocol
draft-dbider-sha2-mac-for-ssh-05

The information below is for an old version of the document
Document Type Active Internet-Draft (individual in sec area)
Last updated 2012-04-26 (latest revision 2012-01-23)
Stream IETF
Intended RFC status Proposed Standard
Formats plain text pdf html
Stream WG state (None)
Consensus Unknown
Document shepherd None
IESG IESG state IESG Evaluation::Revised I-D Needed
Telechat date
Needs a YES. Needs 5 more YES or NO OBJECTION positions to pass.
Responsible AD spt
IESG note Jeffrey Hutzelman (jhutz@cmu.edu) is the document shepherd.
Send notices to ietf-ssh2@denisbider.com, mdb@cisco.com, draft-dbider-sha2-mac-for-ssh@tools.ietf.org, jhutz@cmu.edu
Network Working Group                                           d. bider
Internet-Draft                                           Bitvise Limited
Updates: 4253 (if approved)                                   M. Baushke
Intended status: Standards Track                  Juniper Networks, Inc.
Expires: July 26, 2012                                  January 23, 2012

 SHA-2 Data Integrity Verification for the Secure Shell (SSH) Transport
                             Layer Protocol
                    draft-dbider-sha2-mac-for-ssh-05

Abstract

   This memo defines algorithm names and parameters for use of some of
   the SHA-2 family of secure hash algorithms for data integrity
   verification in the Secure Shell (SSH) protocol.  It also updates
   RFC4253 by specifying a new RECOMMENDED data integrity algorithm.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   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."

   This Internet-Draft will expire on July 26, 2012.

Copyright Notice

   Copyright (c) 2012 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

bider & Baushke           Expires July 26, 2012                 [Page 1]
Internet-Draft              SHA-2 MAC for SSH               January 2012

   described in the Simplified BSD License.

1.  Overview and Rationale

   Secure Shell (SSH) [RFC4251] is a very common protocol for secure
   remote login on the Internet.  Currently, SSH defines data integrity
   verification using SHA-1 and MD5 algorithms [RFC4253].  Due to recent
   security concerns with these two algorithms [RFC6151][RFC6194],
   implementors and users request support for data integrity
   verification using some of the SHA-2 family of of secure hash
   algorithms.

   Please send comments on this draft to ietf-ssh@NetBSD.org.

1.1.  Requirements 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.  Data Integrity Algorithms

   This memo adopts the style and conventions of [RFC4253] in defining
   new data integrity algorithms.

   The following new data integrity algorithms are defined:

   hmac-sha2-256     RECOMMENDED   HMAC-SHA2-256
                                   (digest length = 32 bytes,
                                    key length    = 32 bytes)

   hmac-sha2-256-96  OPTIONAL      first 96 bits of HMAC-SHA2-256
                                   (digest length = 12 bytes,
                                    key length    = 32 bytes)

   hmac-sha2-512     OPTIONAL      HMAC-SHA2-512
                                   (digest length = 64 bytes,
                                    key length    = 64 bytes)

   hmac-sha2-512-96  OPTIONAL      first 96 bits of HMAC-SHA2-512
                                   (digest length = 12 bytes,
                                    key length    = 64 bytes)

                                 Figure 1

   The HMAC mechanism was originally defined in [RFC2104] and has been

bider & Baushke           Expires July 26, 2012                 [Page 2]
Internet-Draft              SHA-2 MAC for SSH               January 2012

   updated in [RFC6151].

   The SHA-2 family of secure hash algorithms are defined in
   [FIPS-180-3].

   Sample code for the SHA-based HMAC algorithms are available in
   [RFC6234].  The variants HMAC-SHA2-224 and HMAC-SHA2-384 algorithms
   were considered, but not added to this list as they have the same
Show full document text