< draft-ietf-lamps-cms-aes-gmac-alg-02.txt		draft-ietf-lamps-cms-aes-gmac-alg-03.txt >
	Network Working Group R. Housley		Network Working Group R. Housley
	Internet-Draft Vigil Security		Internet-Draft Vigil Security
	Intended status: Standards Track 30 December 2020		Intended status: Standards Track 27 January 2021
	Expires: 3 July 2021		Expires: 31 July 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-02		draft-ietf-lamps-cms-aes-gmac-alg-03
	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
	skipping to change at page 1, line 32 ¶		skipping to change at page 1, line 32 ¶
	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 3 July 2021.		This Internet-Draft will expire on 31 July 2021.
	Copyright Notice		Copyright Notice
	Copyright (c) 2020 IETF Trust and the persons identified as the		Copyright (c) 2021 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
	and restrictions with respect to this document. Code Components		and restrictions with respect to this document. Code Components
	extracted from this document must include Simplified BSD License text		extracted from this document must include Simplified BSD License text
	as described in Section 4.e of the Trust Legal Provisions and are		as described in Section 4.e of the Trust Legal Provisions and are
	provided without warranty as described in the Simplified BSD License.		provided without warranty as described in the Simplified BSD License.
	skipping to change at page 2, line 48 ¶		skipping to change at page 2, line 48 ¶
	Authentication Code (MAC) algorithm.		Authentication Code (MAC) algorithm.
	MAC algorithm identifiers are located in the AuthenticatedData		MAC algorithm identifiers are located in the AuthenticatedData
	macAlgorithm field.		macAlgorithm field.
	MAC values are located in the AuthenticatedData mac field.		MAC values are located in the AuthenticatedData mac field.
	3.1. AES-GMAC		3.1. AES-GMAC
	The AES-GMAC [AES][GCM] Message Authentication Code (MAC) algorithm		The AES-GMAC [AES][GCM] Message Authentication Code (MAC) algorithm
	uses one of the following algorithm identifiers; the choice depends		uses one of the following algorithm identifiers in the
	on the size of the AES key, which is either 128 bits, 192 bits, or		AuthenticatedData macAlgorithm field; the choice depends on the size
	256 bits:		of the AES key, which is either 128 bits, 192 bits, or 256 bits:
	aes OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840)		aes OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16) us(840)
	organization(1) gov(101) csor(3) nistAlgorithm(4) 1 }		organization(1) gov(101) csor(3) nistAlgorithm(4) 1 }
	id-aes128-GMAC OBJECT IDENTIFIER ::= { aes 9 }		id-aes128-GMAC OBJECT IDENTIFIER ::= { aes 9 }
	id-aes192-GMAC OBJECT IDENTIFIER ::= { aes 29 }		id-aes192-GMAC OBJECT IDENTIFIER ::= { aes 29 }
	id-aes256-GMAC OBJECT IDENTIFIER ::= { aes 49 }		id-aes256-GMAC OBJECT IDENTIFIER ::= { aes 49 }
	skipping to change at page 3, line 25 ¶		skipping to change at page 3, line 25 ¶
	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 field 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)-1, but it
	be a multiple of 8 bits. Within the scope of any content-		MUST 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 field field tells the size of the message		The GMACParameters length field tells the size of the message
	authentication code. It MUST match the size in octets of the value		authentication code. It MUST match the size in octets of the 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
End of changes. 7 change blocks.
	11 lines changed or deleted		11 lines changed or added
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