Internet X.509 Public Key Infrastructure: Additional Algorithm Identifiers for RSASSA-PSS and ECDSA Using SHAKEs
RFC 8692

Document Type RFC - Proposed Standard (December 2019; No errata)
Updates RFC 3279
Authors Panos Kampanakis  , Quynh Dang 
Last updated 2019-12-11
Stream IETF
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Internet Engineering Task Force (IETF)                     P. Kampanakis
Request for Comments: 8692                                 Cisco Systems
Updates: 3279                                                    Q. Dang
Category: Standards Track                                           NIST
ISSN: 2070-1721                                            December 2019

     Internet X.509 Public Key Infrastructure: Additional Algorithm
           Identifiers for RSASSA-PSS and ECDSA Using SHAKEs


   Digital signatures are used to sign messages, X.509 certificates, and
   Certificate Revocation Lists (CRLs).  This document updates the
   "Algorithms and Identifiers for the Internet X.509 Public Key
   Infrastructure Certificate and Certificate Revocation List (CRL)
   Profile" (RFC 3279) and describes the conventions for using the SHAKE
   function family in Internet X.509 certificates and revocation lists
   as one-way hash functions with the RSA Probabilistic signature and
   Elliptic Curve Digital Signature Algorithm (ECDSA) signature
   algorithms.  The conventions for the associated subject public keys
   are also described.

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

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
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   ( in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction
   2.  Terminology
   3.  Identifiers
   4.  Use in PKIX
     4.1.  Signatures
       4.1.1.  RSASSA-PSS Signatures
       4.1.2.  ECDSA Signatures
     4.2.  Public Keys
   5.  IANA Considerations
   6.  Security Considerations
   7.  References
     7.1.  Normative References
     7.2.  Informative References
   Appendix A.  ASN.1 Module
   Authors' Addresses

1.  Introduction

   [RFC3279] defines cryptographic algorithm identifiers for the
   "Internet X.509 Public Key Infrastructure Certificate and Certificate
   Revocation List (CRL) Profile" [RFC5280].  This document updates RFC
   3279 and defines identifiers for several cryptographic algorithms
   that use variable-length output SHAKE functions introduced in [SHA3]
   which can be used with RFC 5280.

   In the SHA-3 family, two extendable-output functions (SHAKEs) are
   defined: SHAKE128 and SHAKE256.  Four other hash function instances,
   SHA3-224, SHA3-256, SHA3-384, and SHA3-512, are also defined but are
   out of scope for this document.  A SHAKE is a variable-length hash
   function defined as SHAKE(M, d) where the output is a d-bits-long
   digest of message M.  The corresponding collision and second-
   preimage-resistance strengths for SHAKE128 are min(d/2, 128) and
   min(d, 128) bits, respectively (see Appendix A.1 of [SHA3]).  And the
   corresponding collision and second-preimage-resistance strengths for
   SHAKE256 are min(d/2, 256) and min(d, 256) bits, respectively.

   A SHAKE can be used as the message digest function (to hash the
   message to be signed) in RSA Probabilistic Signature Scheme (RSASSA-
   PSS) [RFC8017] and ECDSA [X9.62] and as the hash in the mask
   generation function (MGF) in RSASSA-PSS.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

3.  Identifiers

   This section defines four new object identifiers (OIDs), for RSASSA-
   PSS and ECDSA with each of SHAKE128 and SHAKE256.  The same algorithm
   identifiers can be used for identifying a public key in RSASSA-PSS.

   The new identifiers for RSASSA-PSS signatures using SHAKEs are below.

     id-RSASSA-PSS-SHAKE128  OBJECT IDENTIFIER  ::=  { iso(1)
               identified-organization(3) dod(6) internet(1)
               security(5) mechanisms(5) pkix(7) algorithms(6)
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