Using RSA Algorithms with COSE Messages
draft-jones-cose-rsa-03

Document Type Active Internet-Draft (individual)
Last updated 2017-05-18
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Document shepherd Rich Salz
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Telechat date On agenda of 2017-06-22 IESG telechat
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COSE Working Group                                              M. Jones
Internet-Draft                                                 Microsoft
Intended status: Standards Track                            May 18, 2017
Expires: November 19, 2017

                Using RSA Algorithms with COSE Messages
                        draft-jones-cose-rsa-03

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 for the use of RSASSA-PSS signatures,
   RSAES-OAEP encryption, and RSA keys are specified.

Status of This Memo

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   This Internet-Draft will expire on November 19, 2017.

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   Copyright (c) 2017 IETF Trust and the persons identified as the
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Jones                   Expires November 19, 2017               [Page 1]
Internet-Draft   Using RSA Algorithms with COSE Messages        May 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Notation and Conventions . . . . . . . . . .   2
   2.  RSASSA-PSS Signature Algorithm  . . . . . . . . . . . . . . .   2
   3.  RSAES-OAEP Key Encryption Algorithm . . . . . . . . . . . . .   3
   4.  RSA Keys  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  COSE Algorithms Registry  . . . . . . . . . . . . . . . .   5
     5.2.  COSE Key Type Registry  . . . . . . . . . . . . . . . . .   5
     5.3.  COSE Key Type Parameters Registry . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
     6.1.  Key Size Security Considerations  . . . . . . . . . . . .   6
     6.2.  RSASSA-PSS Security Considerations  . . . . . . . . . . .   6
     6.3.  RSAES-OAEP Security Considerations  . . . . . . . . . . .   6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   7
   Appendix B.  Document History . . . . . . . . . . . . . . . . . .   7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   The CBOR Object Signing and Encryption (COSE) [I-D.ietf-cose-msg]
   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 RFC
   2119 [RFC2119].

2.  RSASSA-PSS Signature Algorithm

   The RSASSA-PSS signature algorithm is defined in [RFC3447].

   The RSASSA-PSS signature algorithm is parameterized with a hash
   function (h), a mask generation function (mgf) and a salt length
   (sLen).  For this specification, the mask generation function is
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