Using SHA2 Algorithms with Cryptographic Message Syntax
RFC 5754

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Internet Engineering Task Force (IETF)                         S. Turner
Request for Comments: 5754                                          IECA
Updates: 3370                                               January 2010
Category: Standards Track
ISSN: 2070-1721

        Using SHA2 Algorithms with Cryptographic Message Syntax

Abstract

   This document describes the conventions for using the Secure Hash
   Algorithm (SHA) message digest algorithms (SHA-224, SHA-256, SHA-384,
   SHA-512) with the Cryptographic Message Syntax (CMS).  It also
   describes the conventions for using these algorithms with the CMS and
   the Digital Signature Algorithm (DSA), Rivest Shamir Adleman (RSA),
   and Elliptic Curve DSA (ECDSA) signature algorithms.  Further, it
   provides SMIMECapabilities attribute values for each algorithm.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in 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/rfc5754.

Copyright Notice

   Copyright (c) 2010 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   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.

Turner                       Standards Track                    [Page 1]
RFC 5754             Using SHA2 Algorithms with CMS         January 2010

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................2
      1.1. Conventions Used in This Document ..........................3
   2. Message Digest Algorithms .......................................3
      2.1. SHA-224 ....................................................4
      2.2. SHA-256 ....................................................5
      2.3. SHA-384 ....................................................5
      2.4. SHA-512 ....................................................5
   3. Signature Algorithms ............................................6
      3.1. DSA ........................................................6
      3.2. RSA ........................................................7
      3.3. ECDSA ......................................................8
   4. Security Considerations .........................................9
   5. References ......................................................9
      5.1. Normative References .......................................9
      5.2. Informative References ....................................10

1.  Introduction

   This document specifies the algorithm identifiers and specifies
   parameters for the message digest algorithms SHA-224, SHA-256,
   SHA-384, and SHA-512 for use with the Cryptographic Message Syntax
   (CMS) [RFC5652].  The message digest algorithms are defined in [SHS]
   and reference code is provided in [RFC4634].

   This document also specifies the algorithm identifiers and parameters
   for use of SHA-224, SHA-256, SHA-384, and SHA-512 with DSA [DSS], RSA
   (RSASSA-PKCS1-v1_5) [RFC3447], and ECDSA [DSS].

   This document does not define new identifiers; they are taken from
   [RFC3874], [RFC4055], and [RFC5758].  Additionally, the parameters
   follow the conventions specified therein.  Therefore, there is no
   Abstract Syntax Notation One (ASN.1) module included in this
   document.

Turner                       Standards Track                    [Page 2]
RFC 5754             Using SHA2 Algorithms with CMS         January 2010