Using RSA Algorithms with CBOR Object Signing and Encryption (COSE) Messages
RFC 8230

Document Type RFC - Proposed Standard (September 2017; No errata)
Was draft-jones-cose-rsa (individual)
Last updated 2017-09-05
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Internet Engineering Task Force (IETF)                          M. Jones
Request for Comments: 8230                                     Microsoft
Category: Standards Track                                 September 2017
ISSN: 2070-1721

                       Using RSA Algorithms with
           CBOR Object Signing and Encryption (COSE) Messages

Abstract

   The CBOR Object Signing and Encryption (COSE) specification defines
   cryptographic message encodings using Concise Binary Object
   Representation (CBOR).  This specification defines algorithm
   encodings and representations enabling RSA algorithms to be used for
   COSE messages.  Encodings are specified for the use of RSA
   Probabilistic Signature Scheme (RSASSA-PSS) signatures, RSA
   Encryption Scheme - Optimal Asymmetric Encryption Padding (RSAES-
   OAEP) encryption, and RSA keys.

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
   http://www.rfc-editor.org/info/rfc8230.

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.

Jones                        Standards Track                    [Page 1]
RFC 8230         Using RSA Algorithms with COSE Messages  September 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Notation and Conventions . . . . . . . . . .   3
   2.  RSASSA-PSS Signature Algorithm  . . . . . . . . . . . . . . .   3
   3.  RSAES-OAEP Key Encryption Algorithm . . . . . . . . . . . . .   4
   4.  RSA Keys  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
     5.1.  COSE Algorithms Registrations . . . . . . . . . . . . . .   6
     5.2.  COSE Key Type Registrations . . . . . . . . . . . . . . .   7
     5.3.  COSE Key Type Parameters Registrations  . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
     6.1.  Key Size Security Considerations  . . . . . . . . . . . .   9
     6.2.  RSASSA-PSS Security Considerations  . . . . . . . . . . .  10
     6.3.  RSAES-OAEP Security Considerations  . . . . . . . . . . .  10
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  12
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  12

Jones                        Standards Track                    [Page 2]
RFC 8230         Using RSA Algorithms with COSE Messages  September 2017

1.  Introduction

   The CBOR Object Signing and Encryption (COSE) [RFC8152] specification
   defines cryptographic message encodings using Concise Binary Object
   Representation (CBOR) [RFC7049].  This specification defines
   algorithm encodings and representations enabling RSA algorithms to be
   used for COSE messages.

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-PSS Signature Algorithm

   The RSASSA-PSS signature algorithm is defined in [RFC8017].

   The RSASSA-PSS signature algorithm is parameterized with a hash
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