Use of the Elliptic Curve Diffie-Hellman Key Agreement Algorithm with X25519 and X448 in the Cryptographic Message Syntax (CMS)
draft-ietf-curdle-cms-ecdh-new-curves-10

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Last updated 2017-08-22
Replaces draft-housley-cms-ecdh-new-curves
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Internet-Draft                                                R. Housley
Intended status: Standards Track                          Vigil Security
Expires: 22 February 2018                                 22 August 2017

    Use of the Elliptic Curve Diffie-Hellman Key Agreement Algorithm
     with X25519 and X448 in the Cryptographic Message Syntax (CMS)

             <draft-ietf-curdle-cms-ecdh-new-curves-10.txt>

Abstract

   This document describes the conventions for using Elliptic Curve
   Diffie-Hellman (ECDH) key agreement algorithm using curve25519 and
   curve448 in the Cryptographic Message Syntax (CMS).

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Housley              Using X25519 and X448 with CMS             [Page 1]
Internet-Draft                                               August 2017

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
     1.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  2
     1.2.  ASN.1  . . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  Key Agreement  . . . . . . . . . . . . . . . . . . . . . . . .  2
     2.1.  ANSI-X9.63-KDF . . . . . . . . . . . . . . . . . . . . . .  5
     2.2.  HKDF . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
   3. Enveloped-data Conventions  . . . . . . . . . . . . . . . . . .  6
     3.1.  EnvelopedData Fields . . . . . . . . . . . . . . . . . . .  6
     3.2. KeyAgreeRecipientInfo Fields  . . . . . . . . . . . . . . .  7
   4.  Authenticated-data Conventions . . . . . . . . . . . . . . . .  8
     4.1.  AuthenticatedData Fields . . . . . . . . . . . . . . . . .  8
     4.2.  KeyAgreeRecipientInfo Fields . . . . . . . . . . . . . . .  8
   5.  Authenticated-Enveloped-data Conventions . . . . . . . . . . .  8
     5.1.  AuthEnvelopedData Fields . . . . . . . . . . . . . . . . .  9
     5.2.  KeyAgreeRecipientInfo Fields . . . . . . . . . . . . . . .  9
   6.  Certificate Conventions  . . . . . . . . . . . . . . . . . . .  9
   7.  Key Agreement Algorithm Identifiers  . . . . . . . . . . . . .  9
   8.  SMIMECapabilities Attribute Conventions  . . . . . . . . . . . 10
   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 11
   10.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
   11.  Normative References  . . . . . . . . . . . . . . . . . . . . 12
   12.  Informative References  . . . . . . . . . . . . . . . . . . . 14
   Appendix: ASN.1 Module . . . . . . . . . . . . . . . . . . . . . . 15
   Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . . 17
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 17

1.  Introduction

   This document describes the conventions for using Elliptic Curve
   Diffie-Hellman (ECDH) key agreement using curve25519 and curve448
   [CURVES] in the Cryptographic Message Syntax (CMS) [CMS].  Key
   agreement is supported in three CMS content types: the enveloped-data
   content type [CMS], authenticated-data content type [CMS], and the
   authenticated-enveloped-data content type [AUTHENV].

   The conventions for using some Elliptic Curve Cryptography (ECC)
   algorithms in CMS are described in [CMSECC].  These conventions cover
   the use of ECDH with some curves other than curve25519 and curve448
   [CURVES].  Those other curves are not deprecated.

   Using curve25519 with Diffie-Hellman key agreement is referred to as
   X25519.  Using curve448 with Diffie-Hellman key agreement is referred
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