< draft-ietf-curdle-cms-eddsa-signatures-02.txt		draft-ietf-curdle-cms-eddsa-signatures-03.txt >
	Internet-Draft R. Housley		Internet-Draft R. Housley
	Intended status: Standards Track Vigil Security		Intended status: Standards Track Vigil Security
	Expires: 28 May 2017 28 November 2016		Expires: 26 July 2017 26 January 2017
	Use of EdDSA Signatures in the Cryptographic Message Syntax (CMS)		Use of EdDSA Signatures in the Cryptographic Message Syntax (CMS)
	<draft-ietf-curdle-cms-eddsa-signatures-02.txt>		<draft-ietf-curdle-cms-eddsa-signatures-03.txt>
	Abstract		Abstract
	This document specifies the conventions for using Edwards-curve		This document specifies the conventions for using Edwards-curve
	Digital Signature Algorithm (EdDSA) for Curve25519 and Curve448 in		Digital Signature Algorithm (EdDSA) for Curve25519 and Curve448 in
	the Cryptographic Message Syntax (CMS). For each curve, EdDSA		the Cryptographic Message Syntax (CMS). For each curve, EdDSA
	defines the PureEdDSA and HashEdDSA modes. However, the HashEdDSA		defines the PureEdDSA and HashEdDSA modes. However, the HashEdDSA
	mode is not used with the CMS. In addition, no context string is		mode is not used with the CMS. In addition, no context string is
	used with the CMS.		used with the CMS.
	skipping to change at page 1, line 34 ¶		skipping to change at page 1, line 34 ¶
	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 http://datatracker.ietf.org/drafts/current/.		Drafts is at http://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 28 May 2017.		This Internet-Draft will expire on 26 July 2017.
	Copyright Notice		Copyright Notice
	Copyright (c) 2016 IETF Trust and the persons identified as the		Copyright (c) 2017 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		Provisions Relating to IETF Documents
	(http://trustee.ietf.org/license-info) in effect on the date of		(http://trustee.ietf.org/license-info) in effect on the date of
	publication of this document. Please review these documents		publication of this document. Please review these documents
	carefully, as they describe your rights and restrictions with respect		carefully, as they describe your rights and restrictions with respect
	to this document. Code Components extracted from this document must		to this document. Code Components extracted from this document must
	include Simplified BSD License text as described in Section 4.e of		include Simplified BSD License text as described in Section 4.e of
	the Trust Legal Provisions and are provided without warranty as		the Trust Legal Provisions and are provided without warranty as
	skipping to change at page 3, line 17 ¶		skipping to change at page 3, line 17 ¶
	ALGORITHM ::= CLASS {		ALGORITHM ::= CLASS {
	&id OBJECT IDENTIFIER UNIQUE,		&id OBJECT IDENTIFIER UNIQUE,
	&Type OPTIONAL }		&Type OPTIONAL }
	WITH SYNTAX {		WITH SYNTAX {
	OID &id [PARMS &Type] }		OID &id [PARMS &Type] }
	2.2. EdDSA Algorithm Identifiers		2.2. EdDSA Algorithm Identifiers
	The EdDSA signature algorithm is defined in [EDDSA], and the		The EdDSA signature algorithm is defined in [EDDSA], and the
	conventions for encoding the public key are defined in		conventions for encoding the public key are defined in
	[ID.curdle-pkix].		[CURDLE-PKIX].
	The id-Ed25519 and id-Ed448 object identifiers are used to identify		The id-Ed25519 and id-Ed448 object identifiers are used to identify
	EdDSA public keys in certificates. The object identifiers are		EdDSA public keys in certificates. The object identifiers are
	specified in [ID.curdle-pkix], and they are repeated here for		specified in [CURDLE-PKIX], and they are repeated here for
	convenience:		convenience:
	sigAlg-Ed25519 ALGORITHM ::= { OID id-Ed25519 }		sigAlg-Ed25519 ALGORITHM ::= { OID id-Ed25519 }
	sigAlg-Ed448 ALGORITHM ::= { OID id-Ed448 }		sigAlg-Ed448 ALGORITHM ::= { OID id-Ed448 }
	id-Ed25519 OBJECT IDENTIFIER ::= { 1 3 101 112 }		id-Ed25519 OBJECT IDENTIFIER ::= { 1 3 101 112 }
	id-Ed448 OBJECT IDENTIFIER ::= { 1 3 101 113 }		id-Ed448 OBJECT IDENTIFIER ::= { 1 3 101 113 }
	skipping to change at page 4, line 13 ¶		skipping to change at page 4, line 13 ¶
	PARMS ShakeOutputLen }		PARMS ShakeOutputLen }
	hashalgs OBJECT IDENTIFIER ::= { joint-iso-itu-t(2)		hashalgs OBJECT IDENTIFIER ::= { joint-iso-itu-t(2)
	country(16) us(840) organization(1)		country(16) us(840) organization(1)
	gov(101) csor(3) nistalgorithm(4) 2 }		gov(101) csor(3) nistalgorithm(4) 2 }
	id-sha512 OBJECT IDENTIFIER ::= { hashAlgs 3 }		id-sha512 OBJECT IDENTIFIER ::= { hashAlgs 3 }
	id-shake256 OBJECT IDENTIFIER ::= { hashAlgs 12 }		id-shake256 OBJECT IDENTIFIER ::= { hashAlgs 12 }
	id-shake256-len OBJECT IDENTIFIER ::= { hashAlgs 13 }		id-shake256-len OBJECT IDENTIFIER ::= { hashAlgs 18 }
	ShakeOutputLen ::= INTEGER -- Output length in bits		ShakeOutputLen ::= INTEGER -- Output length in bits
	When using the id-sha512 or id-shake256 algorithm identifier, the		When using the id-sha512 or id-shake256 algorithm identifier, the
	parameters MUST be absent.		parameters MUST be absent.
	When using the id-shake256-len algorithm identifier, the parameters		When using the id-shake256-len algorithm identifier, the parameters
	MUST be present, and the parameter MUST contain 512, encoded as a		MUST be present, and the parameter MUST contain 512, encoded as a
	positive integer value.		positive integer value.
	skipping to change at page 7, line 5 ¶		skipping to change at page 7, line 5 ¶
	Using the same private key for different algorithms has the potential		Using the same private key for different algorithms has the potential
	of allowing an attacker to get extra information about the private		of allowing an attacker to get extra information about the private
	key. For this reason, the same private key SHOULD NOT be used with		key. For this reason, the same private key SHOULD NOT be used with
	more than one EdDSA set of parameters. For example, do not use the		more than one EdDSA set of parameters. For example, do not use the
	same private key with PureEdDSA and HashEdDSA.		same private key with PureEdDSA and HashEdDSA.
	When computing signatures, the same hash function should be used for		When computing signatures, the same hash function should be used for
	all operations. This reduces the number of failure points in the		all operations. This reduces the number of failure points in the
	signature process.		signature process.
	6. Normative References		6. Acknowledgements
			Many thanks to Jim Schaad for the careful review and comment on the
			draft document. Thanks to Quynh Dang with the object identifiers
			that were assigned by NIST.
			7. Normative References
	[CMS] Housley, R., "Cryptographic Message Syntax (CMS)",		[CMS] Housley, R., "Cryptographic Message Syntax (CMS)",
	RFC 5652, September 2009.		RFC 5652, September 2009.
			[CURDLE-PKIX]
			Josefsson, S., and J. Schaad, "Algorithm Identifiers for
			Ed25519, Ed25519ph, Ed448, Ed448ph, X25519 and X448 for
			use in the Internet X.509 Public Key Infrastructure",
			draft-ietf-curdle-pkix-02, 31 October 2016,
			Work-in-progress.
	[EDDSA] Josefsson, S. and I. Liusvaara, "Edwards-curve Digital		[EDDSA] Josefsson, S. and I. Liusvaara, "Edwards-curve Digital
	Signature Algorithm (EdDSA)", draft-irtf-cfrg-eddsa-08,		Signature Algorithm (EdDSA)", draft-irtf-cfrg-eddsa-08,
	19 August 2016, Work-in-progress.		19 August 2016, Work-in-progress.
	[FIPS202] National Institute of Standards and Technology, U.S.		[FIPS202] National Institute of Standards and Technology, U.S.
	Department of Commerce, "SHA-3 Standard: Permutation-Based		Department of Commerce, "SHA-3 Standard: Permutation-Based
	Hash and Extendable-Output Functions", FIPS 202,		Hash and Extendable-Output Functions", FIPS 202,
	August 2015.		August 2015.
	[ID.curdle-pkix]
	Josefsson, S., and J. Schaad, "Algorithm Identifiers for
	Ed25519, Ed25519ph, Ed448, Ed448ph, X25519 and X448 for
	use in the Internet X.509 Public Key Infrastructure",
	draft-ietf-curdle-pkix-02, 31 October 2016,
	Work-in-progress.
	[RFC4634] Eastlake 3rd, D. and T. Hansen, "US Secure Hash Algorithms		[RFC4634] Eastlake 3rd, D. and T. Hansen, "US Secure Hash Algorithms
	(SHA and HMAC-SHA)", RFC 4634, July 2006.		(SHA and HMAC-SHA)", RFC 4634, July 2006.
	[STDWORDS] Bradner, S., "Key words for use in RFCs to Indicate		[STDWORDS] Bradner, S., "Key words for use in RFCs to Indicate
	Requirement Levels", BCP 14, RFC 2119, March 1997.		Requirement Levels", BCP 14, RFC 2119, March 1997.
	[X680] ITU-T, "Information technology -- Abstract Syntax Notation		[X680] ITU-T, "Information technology -- Abstract Syntax Notation
	One (ASN.1): Specification of basic notation", ITU-T		One (ASN.1): Specification of basic notation", ITU-T
	Recommendation X.680, 2015.		Recommendation X.680, 2015.
	[X690] ITU-T, "Information technology -- ASN.1 encoding rules:		[X690] ITU-T, "Information technology -- ASN.1 encoding rules:
	Specification of Basic Encoding Rules (BER), Canonical		Specification of Basic Encoding Rules (BER), Canonical
	Encoding Rules (CER) and Distinguished Encoding Rules		Encoding Rules (CER) and Distinguished Encoding Rules
	(DER)", ITU-T Recommendation X.690, 2015.		(DER)", ITU-T Recommendation X.690, 2015.
	7. Informative References		8. Informative References
	[RANDOM] Eastlake, D., Schiller, J., and S. Crocker, "Randomness		[RANDOM] Eastlake, D., Schiller, J., and S. Crocker, "Randomness
	Requirements for Security", RFC 4086, June 2005.		Requirements for Security", RFC 4086, June 2005.
	Author Address		Author Address
	Russ Housley		Russ Housley
	918 Spring Knoll Drive		918 Spring Knoll Drive
	Herndon, VA 20170		Herndon, VA 20170
	USA		USA
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