Public Key Cryptography for Initial Authentication in Kerberos (PKINIT) Algorithm Agility
RFC 8636

Document Type RFC - Proposed Standard (July 2019; No errata)
Updates RFC 4556
Last updated 2019-07-18
Replaces draft-ietf-krb-wg-pkinit-alg-agility
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Robbie Harwood
Shepherd write-up Show (last changed 2018-08-27)
IESG IESG state RFC 8636 (Proposed Standard)
Consensus Boilerplate Yes
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Responsible AD Benjamin Kaduk
Send notices to Robbie Harwood <rharwood@redhat.com>
IANA IANA review state IANA OK - Actions Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)              L. Hornquist Astrand
Request for Comments: 8636                                    Apple, Inc
Updates: 4556                                                     L. Zhu
Category: Standards Track                             Oracle Corporation
ISSN: 2070-1721                                                M. Cullen
                                                       Painless Security
                                                               G. Hudson
                                                                     MIT
                                                               July 2019

Public Key Cryptography for Initial Authentication in Kerberos (PKINIT)
                           Algorithm Agility

Abstract

   This document updates the Public Key Cryptography for Initial
   Authentication in Kerberos (PKINIT) standard (RFC 4556) to remove
   protocol structures tied to specific cryptographic algorithms.  The
   PKINIT key derivation function is made negotiable, and the digest
   algorithms for signing the pre-authentication data and the client's
   X.509 certificates are made discoverable.

   These changes provide preemptive protection against vulnerabilities
   discovered in the future in any specific cryptographic algorithm and
   allow incremental deployment of newer algorithms.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8636.

Hornquist Astrand, et al.    Standards Track                    [Page 1]
RFC 8636                PKINIT Algorithm Agility               July 2019

Copyright Notice

   Copyright (c) 2019 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

   (https://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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Hornquist Astrand, et al.    Standards Track                    [Page 2]
RFC 8636                PKINIT Algorithm Agility               July 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements Notation . . . . . . . . . . . . . . . . . . . .   4
   3.  paChecksum Agility  . . . . . . . . . . . . . . . . . . . . .   4
   4.  CMS Digest Algorithm Agility  . . . . . . . . . . . . . . . .   5
   5.  X.509 Certificate Signer Algorithm Agility  . . . . . . . . .   5
   6.  KDF Agility . . . . . . . . . . . . . . . . . . . . . . . . .   6
   7.  Interoperability  . . . . . . . . . . . . . . . . . . . . . .  11
   8.  Test Vectors  . . . . . . . . . . . . . . . . . . . . . . . .  12
     8.1.  Common Inputs . . . . . . . . . . . . . . . . . . . . . .  12
     8.2.  Test Vector for SHA-1, enctype 18 . . . . . . . . . . . .  12
       8.2.1.  Specific Inputs . . . . . . . . . . . . . . . . . . .  12
       8.2.2.  Outputs . . . . . . . . . . . . . . . . . . . . . . .  12
     8.3.  Test Vector for SHA-256, enctype 18 . . . . . . . . . . .  13
       8.3.1.  Specific Inputs . . . . . . . . . . . . . . . . . . .  13
       8.3.2.  Outputs . . . . . . . . . . . . . . . . . . . . . . .  13
     8.4.  Test Vector for SHA-512, enctype 16 . . . . . . . . . . .  13
       8.4.1.  Specific Inputs . . . . . . . . . . . . . . . . . . .  13
       8.4.2.  Outputs . . . . . . . . . . . . . . . . . . . . . . .  13
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