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 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | GENART will not review this version | ||
| Stream | WG state | (None) | |
| Document shepherd | Rich Salz | ||
| Shepherd write-up | Show (last changed 2017-05-03) | ||
| IESG | IESG state | RFC 8230 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Kathleen Moriarty | ||
| Send notices to | (None) | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
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
function (h), a mask generation function (mgf), and a salt length
(sLen). For this specification, the mask generation function is
fixed to be MGF1 as defined in [RFC8017]. It has been recommended
that the same hash function be used for hashing the data as well as
in the mask generation function. This specification follows this
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