CBOR Object Signing and Encryption (COSE)
draft-ietf-cose-msg-18
| The information below is for an old version of the document | |||
|---|---|---|---|
| Document | Type | Active Internet-Draft (cose WG) | |
| Last updated | 2016-09-27 (latest revision 2016-09-10) | ||
| Replaces | draft-schaad-cose-msg | ||
| Stream | IETF | ||
| Intended RFC status | Proposed Standard | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Göran Selander | ||
| Shepherd write-up | Show (last changed 2016-08-14) | ||
| IESG | IESG state | In Last Call (ends 2016-09-28) | |
| Consensus Boilerplate | Yes | ||
| Telechat date |
Needs a YES. Needs 4 more YES or NO OBJECTION positions to pass. |
||
| Responsible AD | Kathleen Moriarty | ||
| Send notices to | "Goeran Selander" <goran.selander@ericsson.com> | ||
| IANA | IANA review state | IANA - Not OK | |
| IANA action state | None | ||
COSE Working Group J. Schaad
Internet-Draft August Cellars
Intended status: Standards Track September 10, 2016
Expires: March 14, 2017
CBOR Object Signing and Encryption (COSE)
draft-ietf-cose-msg-18
Abstract
Concise Binary Object Representation (CBOR) is data format designed
for small code size and small message size. There is a need for the
ability to have basic security services defined for this data format.
This document defines the CBOR Object Signing and Encryption (COSE)
specification. This specification describes how to create and
process signature, message authentication codes and encryption using
CBOR for serialization. This specification additionally specifies
how to represent cryptographic keys using CBOR.
Contributing to this document
The source for this draft is being maintained in GitHub. Suggested
changes should be submitted as pull requests at <https://github.com/
cose-wg/cose-spec>. Instructions are on that page as well.
Editorial changes can be managed in GitHub, but any substantial
issues need to be discussed on the COSE mailing list.
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
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on March 14, 2017.
Schaad Expires March 14, 2017 [Page 1]
Internet-Draft CBOR Object Signing and Encryption (COSE) September 2016
Copyright Notice
Copyright (c) 2016 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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Design changes from JOSE . . . . . . . . . . . . . . . . 5
1.2. Requirements Terminology . . . . . . . . . . . . . . . . 6
1.3. CBOR Grammar . . . . . . . . . . . . . . . . . . . . . . 6
1.4. CBOR Related Terminology . . . . . . . . . . . . . . . . 7
1.5. Document Terminology . . . . . . . . . . . . . . . . . . 8
2. Basic COSE Structure . . . . . . . . . . . . . . . . . . . . 8
3. Header Parameters . . . . . . . . . . . . . . . . . . . . . . 10
3.1. Common COSE Headers Parameters . . . . . . . . . . . . . 12
4. Signing Objects . . . . . . . . . . . . . . . . . . . . . . . 16
4.1. Signing with One or More Signers . . . . . . . . . . . . 16
4.2. Signing with One Signer . . . . . . . . . . . . . . . . . 18
4.3. Externally Supplied Data . . . . . . . . . . . . . . . . 19
4.4. Signing and Verification Process . . . . . . . . . . . . 20
4.5. Computing Counter Signatures . . . . . . . . . . . . . . 21
5. Encryption Objects . . . . . . . . . . . . . . . . . . . . . 22
5.1. Enveloped COSE Structure . . . . . . . . . . . . . . . . 22
5.1.1. Recipient Algorithm Classes . . . . . . . . . . . . . 24
5.2. Single Recipient Encrypted . . . . . . . . . . . . . . . 25
5.3. How to encrypt and decrypt for AEAD Algorithms . . . . . 25
5.4. How to encrypt and decrypt for AE Algorithms . . . . . . 28
6. MAC Objects . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.1. MACed Message with Recipients . . . . . . . . . . . . . . 30
6.2. MACed Messages with Implicit Key . . . . . . . . . . . . 31
6.3. How to compute and verify a MAC . . . . . . . . . . . . . 31
7. Key Objects . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.1. COSE Key Common Parameters . . . . . . . . . . . . . . . 33
8. Signature Algorithms . . . . . . . . . . . . . . . . . . . . 36
8.1. ECDSA . . . . . . . . . . . . . . . . . . . . . . . . . . 37
8.1.1. Security Considerations . . . . . . . . . . . . . . . 39
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