draft-ietf-lamps-cms-aes-gmac-alg-00.txt   draft-ietf-lamps-cms-aes-gmac-alg-01.txt 
Network Working Group R. Housley Network Working Group R. Housley
Internet-Draft Vigil Security Internet-Draft Vigil Security
Intended status: Standards Track 2 December 2020 Intended status: Standards Track 23 December 2020
Expires: 5 June 2021 Expires: 26 June 2021
Using the AES-GMAC Algorithm with the Cryptographic Message Syntax (CMS) Using the AES-GMAC Algorithm with the Cryptographic Message Syntax (CMS)
draft-ietf-lamps-cms-aes-gmac-alg-00 draft-ietf-lamps-cms-aes-gmac-alg-01
Abstract Abstract
This document specifies the conventions for using the AES-GMAC This document specifies the conventions for using the AES-GMAC
Message Authentication Code algorithms with the Cryptographic Message Message Authentication Code algorithms with the Cryptographic Message
Syntax (CMS) as specified in RFC 5652. Syntax (CMS) as specified in RFC 5652.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on 5 June 2021. This Internet-Draft will expire on 26 June 2021.
Copyright Notice Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/ Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document. license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights Please review these documents carefully, as they describe your rights
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For all three of these algorithm identifier values, the For all three of these algorithm identifier values, the
AlgorithmIdentifier parameters field MUST be present, and the AlgorithmIdentifier parameters field MUST be present, and the
parameters MUST contain GMACParameters: parameters MUST contain GMACParameters:
GMACParameters ::= SEQUENCE { GMACParameters ::= SEQUENCE {
nonce OCTET STRING, -- recommended size is 12 octets nonce OCTET STRING, -- recommended size is 12 octets
length MACLength DEFAULT 12 } length MACLength DEFAULT 12 }
MACLength ::= INTEGER (12 | 13 | 14 | 15 | 16) MACLength ::= INTEGER (12 | 13 | 14 | 15 | 16)
The GMACParameters nonce parameter is the GMAC initialization vector. The GMACParameters nonce field is the GMAC initialization vector.
The nonce may have any number of bits between 8 and 2^64, but it MUST The nonce may have any number of bits between 8 and 2^64, but it MUST
be a multiple of 8 bits. Within the scope of any content- be a multiple of 8 bits. Within the scope of any content-
authentication key, the nonce value MUST be unique. A nonce value of authentication key, the nonce value MUST be unique. A nonce value of
12 octets can be processed more efficiently, so that length for the 12 octets can be processed more efficiently, so that length for the
nonce value is RECOMMENDED. nonce value is RECOMMENDED.
The GMACParameters length parameter field tells the size of the The GMACParameters length field field tells the size of the message
message authentication code. It MUST match the size in octets of the authentication code. It MUST match the size in octets of the value
value in the AuthenticatedData mac field. A length of 12 octets is in the AuthenticatedData mac field. A length of 12 octets is
RECOMMENDED. RECOMMENDED.
4. Implementation Considerations 4. Implementation Considerations
An implementation of the Advanced Encryption Standard (AES) Galois/ An implementation of the Advanced Encryption Standard (AES) Galois/
Counter Mode (GCM) authenticated encryption algorithm is specified in Counter Mode (GCM) authenticated encryption algorithm is specified in
[GCM]. An implementation of AES-GCM can be used to compute the GMAC [GCM]. An implementation of AES-GCM can be used to compute the GMAC
message authentication code by providing the content-authentication message authentication code by providing the content-authentication
key as the AES key, the nonce as the initialization vector, a zero- key as the AES key, the nonce as the initialization vector, a zero-
length plaintext content, and the content to be authenticated as the length plaintext content, and the content to be authenticated as the
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