COSE Algorithms for Web Authentication (WebAuthn)
draft-jones-webauthn-cose-algorithms-01

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WebAuthn Working Group                                          M. Jones
Internet-Draft                                                 Microsoft
Intended status: Informational                               May 2, 2018
Expires: November 3, 2018

           COSE Algorithms for Web Authentication (WebAuthn)
                draft-jones-webauthn-cose-algorithms-01

Abstract

   The W3C Web Authentication (WebAuthn) specification uses COSE
   algorithm identifiers.  This specification registers algorithms in
   the IANA "COSE Algorithms" registry that are used by WebAuthn 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.

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   This Internet-Draft will expire on November 3, 2018.

Copyright Notice

   Copyright (c) 2018 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 . . . . . . . . . . . .   2
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  COSE Algorithms Registrations . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
     4.1.  RSA Key Size Security Considerations  . . . . . . . . . .   4
     4.2.  RSASSA-PKCS1-v1_5 with SHA-2 Security Considerations  . .   4
     4.3.  RSASSA-PKCS1-v1_5 with SHA-1 Security Considerations  . .   4
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     5.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   5
   Document History  . . . . . . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   This specification defines how to use several algorithms with COSE
   [RFC8152] that are used by the W3C Web Authentication (WebAuthn)
   [WebAuthn] specification.  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.

2.  RSASSA-PKCS1-v1_5 Signature Algorithm

   The RSASSA-PKCS1-v1_5 signature algorithm is defined in [RFC8017].
   The RSASSA-PKCS1-v1_5 signature algorithm is parameterized with a
   hash function (h).

   A key of size 2048 bits or larger MUST be used with these algorithms.
   Implementations need to check that the key type is 'RSA' when
   creating or verifying a signature.

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   The RSASSA-PKCS1-v1_5 algorithms specified in this document are in
   the following table.

   +-------+-------------------------+---------+-----------------------+
   | Name  | Value                   | Hash    | Description           |
   +-------+-------------------------+---------+-----------------------+
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