Using the AES-GMAC Algorithm with the Cryptographic Message Syntax (CMS)
draft-housley-lamps-cms-aes-mac-alg-00

Document Type Active Internet-Draft (candidate for lamps WG)
Author Russ Housley 
Last updated 2020-11-20 (latest revision 2020-11-09)
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Network Working Group                                         R. Housley
Internet-Draft                                            Vigil Security
Intended status: Standards Track                         9 November 2020
Expires: 13 May 2021

Using the AES-GMAC Algorithm with the Cryptographic Message Syntax (CMS)
                 draft-housley-lamps-cms-aes-mac-alg-00

Abstract

   This document specifies the conventions for using the AES-GMAC
   Message Authentication Code algorithms with the Cryptographic Message
   Syntax (CMS) as specified in RFC 5652.

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 13 May 2021.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Message Authentication Code Algorithms  . . . . . . . . . . .   2
     3.1.  AES-GMAC  . . . . . . . . . . . . . . . . . . . . . . . .   2
   4.  Implementation Considerations . . . . . . . . . . . . . . . .   3
   5.  ASN.1 Module  . . . . . . . . . . . . . . . . . . . . . . . .   4
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   This document specifies the conventions for using the AES-GMAC
   [AES][GCM] Message Authentication Code (MAC) algorithm with the
   Cryptographic Message Syntax (CMS) [RFC5652].

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

3.  Message Authentication Code Algorithms

   This section specifies the conventions employed by CMS [RFC5652]
   implementations that support the AES-GMAC [AES][GCM] Message
   Authentication Code (MAC) algorithm.

   MAC algorithm identifiers are located in the AuthenticatedData
   macAlgorithm field.

   MAC values are located in the AuthenticatedData mac field.

3.1.  AES-GMAC

   The AES-GMAC [AES][GCM] Message Authentication Code (MAC) algorithm
   uses one of the following algorithm identifiers; the choice depends
   on the size of the AES key, which is either 128 bits, 192 bits, or
   256 bits:

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      aes OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840)
              organization(1) gov(101) csor(3) nistAlgorithm(4) 1 }

      id-aes128-GMAC OBJECT IDENTIFIER ::= { aes 9 }

      id-aes192-GMAC OBJECT IDENTIFIER ::= { aes 29 }

      id-aes256-GMAC OBJECT IDENTIFIER ::= { aes 49 }

   For all three of these algorithm identifier values, the
   AlgorithmIdentifier parameters field MUST be present, and the
   parameters MUST contain GMACParameters:

      GMACParameters ::= SEQUENCE {
         nonce        OCTET STRING, -- recommended size is 12 octets
         length       MACLength DEFAULT 12 }

      MACLength ::= INTEGER (12 | 13 | 14 | 15 | 16)
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