Using SHA2 Algorithms with Cryptographic Message Syntax
RFC 5754

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.

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

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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