COSE and JOSE Registrations for WebAuthn Algorithms
draft-ietf-cose-webauthn-algorithms-01

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Last updated 2019-07-08
Replaces draft-jones-cose-additional-algorithms
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COSE Working Group                                              M. Jones
Internet-Draft                                                 Microsoft
Intended status: Standards Track                            July 8, 2019
Expires: January 9, 2020

          COSE and JOSE Registrations for WebAuthn Algorithms
                 draft-ietf-cose-webauthn-algorithms-01

Abstract

   The W3C Web Authentication (WebAuthn) specification and the FIDO2
   Client to Authenticator Protocol (CTAP) specification use COSE
   algorithm identifiers.  This specification registers algorithms in
   the IANA "COSE Algorithms" registry that are used by WebAuthn and
   CTAP implementations that are not already registered.  Also, they are
   registered in the IANA "JSON Web Signature and Encryption Algorithms"
   registry, when not already registered there.

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 January 9, 2020.

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

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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
     1.1.  Requirements Notation and Conventions . . . . . . . . . .   2
   2.  RSASSA-PKCS1-v1_5 Signature Algorithm . . . . . . . . . . . .   3
   3.  Using secp256k1 with JOSE and COSE  . . . . . . . . . . . . .   3
     3.1.  JOSE and COSE secp256k1 Curve Key Representations . . . .   3
     3.2.  ECDSA Signature with secp256k1 Curve  . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  COSE Algorithms Registrations . . . . . . . . . . . . . .   5
     4.2.  COSE Elliptic Curves Registrations  . . . . . . . . . . .   6
     4.3.  JOSE Algorithms Registrations . . . . . . . . . . . . . .   6
     4.4.  JSON Web Key Elliptic Curves Registrations  . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
     5.1.  RSA Key Size Security Considerations  . . . . . . . . . .   6
     5.2.  RSASSA-PKCS1-v1_5 with SHA-2 Security Considerations  . .   7
     5.3.  RSASSA-PKCS1-v1_5 with SHA-1 Security Considerations  . .   7
     5.4.  secp256k1 Security Considerations . . . . . . . . . . . .   7
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   9
   Document History  . . . . . . . . . . . . . . . . . . . . . . . .   9
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   This specification defines how to use several algorithms with COSE
   [RFC8152] that are used by implementations of the W3C Web
   Authentication (WebAuthn) [WebAuthn] and FIDO2 Client to
   Authenticator Protocol (CTAP) [CTAP] specifications.  These
   algorithms are registered in the IANA "COSE Algorithms" registry
   [IANA.COSE.Algorithms] and also in the IANA "JSON Web Signature and
   Encryption Algorithms" registry [IANA.JOSE.Algorithms], when not
   already registered there.

1.1.  Requirements Notation and Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "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.

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