< draft-ietf-curdle-cms-ecdh-new-curves-07.txt		draft-ietf-curdle-cms-ecdh-new-curves-08.txt >
	Internet-Draft R. Housley		Internet-Draft R. Housley
	Intended status: Standards Track Vigil Security		Intended status: Standards Track Vigil Security
	Expires: 11 November 2017 11 May 2017		Expires: 2 December 2017 2 June 2017
	Use of the Elliptic Curve Diffie-Hellman Key Agreement Algorithm		Use of the Elliptic Curve Diffie-Hellman Key Agreement Algorithm
	with X25519 and X448 in the Cryptographic Message Syntax (CMS)		with X25519 and X448 in the Cryptographic Message Syntax (CMS)
	<draft-ietf-curdle-cms-ecdh-new-curves-07.txt>		<draft-ietf-curdle-cms-ecdh-new-curves-08.txt>
	Abstract		Abstract
	This document describes the conventions for using Elliptic Curve		This document describes the conventions for using Elliptic Curve
	Diffie-Hellman (ECDH) key agreement algorithm using curve25519 and		Diffie-Hellman (ECDH) key agreement algorithm using curve25519 and
	curve448 in the Cryptographic Message Syntax (CMS).		curve448 in the Cryptographic Message Syntax (CMS).
	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 33 ¶		skipping to change at page 1, line 33 ¶
	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-
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	This Internet-Draft will expire on 11 November 2017.		This Internet-Draft will expire on 2 December 2017.
	Copyright Notice		Copyright Notice
	Copyright (c) 2017 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
	skipping to change at page 4, line 8 ¶		skipping to change at page 4, line 8 ¶
	encryption key that will be produced by the KDF.		encryption key that will be produced by the KDF.
	The ECC-CMS-SharedInfo suppPubInfo field contains the length of the		The ECC-CMS-SharedInfo suppPubInfo field contains the length of the
	generated key-encryption key, in bits, represented as a 32-bit number		generated key-encryption key, in bits, represented as a 32-bit number
	in network byte order. For example, the key length for AES-256 [AES]		in network byte order. For example, the key length for AES-256 [AES]
	would be 0x00000100.		would be 0x00000100.
	2.1. ANSI-X9.63-KDF		2.1. ANSI-X9.63-KDF
	The ANSI-X9.63-KDF key derivation function is a simple construct		The ANSI-X9.63-KDF key derivation function is a simple construct
	based on a one-way hash function described in ANS X9.63 [X963]. This		based on a one-way hash function described in American National
	KDF is also described in Section 3.6.1 of [SEC1].		Standard X9.63 [X963]. This KDF is also described in Section 3.6.1
			of [SEC1].
	Three values are concatenated to produce the input string to the KDF:		Three values are concatenated to produce the input string to the KDF:
	1. The shared secret value generated by ECDH, K.		1. The shared secret value generated by ECDH, K.
	2. The iteration counter, starting with one, as described below.		2. The iteration counter, starting with one, as described below.
	3. The DER-encoded ECC-CMS-SharedInfo structure.		3. The DER-encoded ECC-CMS-SharedInfo structure.
	To generate a key-encryption key (KEK), the KDF generates one or more		To generate a key-encryption key (KEK), the KDF generates one or more
	KM blocks, with the counter starting at 0x00000001, and incrementing		KM blocks, with the counter starting at 0x00000001, and incrementing
	the counter for each subsequent KM block until enough material has		the counter for each subsequent KM block until enough material has
	been generated. The 32-bit counter is represented in network byte		been generated. The 32-bit counter is represented in network byte
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