Internet DRAFT - draft-luis140219-sha256-aki-ski

draft-luis140219-sha256-aki-ski



INTERNET-DRAFT                                                 L. Camara
Network Working Group                                        May 2, 2017
Updates: 5280 (if approved)
Intended Status: Proposed Standard
Expires: November 3, 2017


     Update to RFC5280 to allow SHA-256 hashes in the Authority Key
            Identifier and Subject Key Identifier extensions
                   draft-luis140219-sha256-aki-ski-02

Abstract

  This document updates RFC 5280, the "Internet X.509 Public Key
  Infrastructure Certificate and Certificate Revocation List (CRL)
  Profile", to allow SHA-256 hashes in the Authority Key Identifier
  and Subject Key Identifier extensions.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on November 3, 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

  1. Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .   2
  2. Updates to RFC 5280 . . . . . . . . . . . . . . . . . . . . . .   2
  3. Security Considerations . . . . . . . . . . . . . . . . . . . .   2

Camara                  Expires November 3, 2017                [Page 1]

Internet-Draft          SHA256 in Key Identifiers             April 2017

  4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . .   2
  5. References  . . . . . . . . . . . . . . . . . . . . . . . . . .   2
  5.1. Normative References  . . . . . . . . . . . . . . . . . . . .   2
  5.2. Informative References  . . . . . . . . . . . . . . . . . . .   2

1. Introduction

This document updates the "Internet X.509 Public Key Infrastructure
   Certificate and Certificate Revocation List (CRL) Profile" [RFC5280].

After the first SHA-1 collision in 2017-02-23 [SHATTERED], hash
collisions are expected to get more efficient and affordable. In the
near future, SHA-1 may not suffice for identification of keys as keys
with colliding hashes may be generated.

2. Updates to RFC 5280

In addition to the two methods defined in Section 4.2.1.2 of RFC 5280,
a third method is defined below that generates the value of the
keyIdentifier from the public key:

The keyIdentifier is composed of the 256-bit SHA-256 hash of the value
of the BIT STRING subjectPublicKey (excluding the tag, length and
number of unused bits).

3. Security Considerations

This document adds capabilities for using more secure technology with
pre-existent standards, and therefore has no security implications.

4. IANA Considerations

This document has no actions for IANA.

5. References

5.1. Normative References

   [RFC5280]   Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
               Housley, R., and W. Polk, "Internet X.509 Public Key
               Infrastructure Certificate and Certificate Revocation
               List (CRL) Profile", RFC 5280, May 2008.

5.2. Informative References

   [SHATTERED] Stevens, M., Bursztein, E., Karpman, P., Albertini, A.,
               Markov, Y., Petit-Bianco, A., Invernizzi, L., and C.
               Blaisse, "SHAttered", https://shattered.io, 23 February
               2017.



Camara                  Expires November 3, 2017                [Page 2]

Internet-Draft          SHA256 in Key Identifiers             April 2017

Author's Address

Luis Camara (@luis140219 on GitHub)

EMail: luis.camara@live.com.pt

















































Camara                  Expires November 3, 2017                [Page 3]