Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS) Versions 1.2 and Earlier
draft-ietf-tls-rfc4492bis-16

Document Type Active Internet-Draft (tls WG)
Last updated 2017-03-23
Replaces draft-nir-tls-rfc4492bis
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication Feb 2017
Document shepherd Sean Turner
Shepherd write-up Show (last changed 2017-02-16)
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Responsible AD Stephen Farrell
Send notices to "Sean Turner" <sean@sn3rd.com>
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TLS Working Group                                                 Y. Nir
Internet-Draft                                               Check Point
Obsoletes: 4492 (if approved)                               S. Josefsson
Intended status: Standards Track                                  SJD AB
Expires: September 24, 2017                          M. Pegourie-Gonnard
                                                  Independent / PolarSSL
                                                          March 23, 2017

  Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer
                Security (TLS) Versions 1.2 and Earlier
                      draft-ietf-tls-rfc4492bis-16

Abstract

   This document describes key exchange algorithms based on Elliptic
   Curve Cryptography (ECC) for the Transport Layer Security (TLS)
   protocol.  In particular, it specifies the use of Ephemeral Elliptic
   Curve Diffie-Hellman (ECDHE) key agreement in a TLS handshake and the
   use of Elliptic Curve Digital Signature Algorithm (ECDSA) and Edwards
   Digital Signature Algorithm (EdDSA) as authentication mechanisms.

   This document obsoletes and replaces RFC 4492.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on September 24, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents

Nir, et al.            Expires September 24, 2017               [Page 1]
Internet-Draft          ECC Cipher Suites for TLS             March 2017

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   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Conventions Used in This Document . . . . . . . . . . . .   3
   2.  Key Exchange Algorithm  . . . . . . . . . . . . . . . . . . .   3
     2.1.  ECDHE_ECDSA . . . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  ECDHE_RSA . . . . . . . . . . . . . . . . . . . . . . . .   6
     2.3.  ECDH_anon . . . . . . . . . . . . . . . . . . . . . . . .   6
     2.4.  Algorithms in Certificate Chains  . . . . . . . . . . . .   6
   3.  Client Authentication . . . . . . . . . . . . . . . . . . . .   6
     3.1.  ECDSA_sign  . . . . . . . . . . . . . . . . . . . . . . .   7
   4.  TLS Extensions for ECC  . . . . . . . . . . . . . . . . . . .   7
   5.  Data Structures and Computations  . . . . . . . . . . . . . .   8
     5.1.  Client Hello Extensions . . . . . . . . . . . . . . . . .   8
       5.1.1.  Supported Elliptic Curves Extension . . . . . . . . .  10
       5.1.2.  Supported Point Formats Extension . . . . . . . . . .  11
       5.1.3.  The signature_algorithms Extension and EdDSA  . . . .  12
     5.2.  Server Hello Extension  . . . . . . . . . . . . . . . . .  12
     5.3.  Server Certificate  . . . . . . . . . . . . . . . . . . .  13
     5.4.  Server Key Exchange . . . . . . . . . . . . . . . . . . .  14
       5.4.1.  Uncompressed Point Format for NIST curves . . . . . .  18
     5.5.  Certificate Request . . . . . . . . . . . . . . . . . . .  18
     5.6.  Client Certificate  . . . . . . . . . . . . . . . . . . .  19
     5.7.  Client Key Exchange . . . . . . . . . . . . . . . . . . .  20
     5.8.  Certificate Verify  . . . . . . . . . . . . . . . . . . .  21
     5.9.  Elliptic Curve Certificates . . . . . . . . . . . . . . .  23
     5.10. ECDH, ECDSA, and RSA Computations . . . . . . . . . . . .  23
     5.11. Public Key Validation . . . . . . . . . . . . . . . . . .  24
   6.  Cipher Suites . . . . . . . . . . . . . . . . . . . . . . . .  24
   7.  Implementation Status . . . . . . . . . . . . . . . . . . . .  25
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  26
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