CBOR Object Signing and Encryption (COSE): Countersignatures
draft-ietf-cose-countersign-01
COSE Working Group J. Schaad
Internet-Draft August Cellars
Intended status: Standards Track R. Housley, Ed.
Expires: 10 April 2021 Vigil Security
7 October 2020
CBOR Object Signing and Encryption (COSE): Countersignatures
draft-ietf-cose-countersign-01
Abstract
Concise Binary Object Representation (CBOR) is a data format designed
for small code size and small message size. CBOR Object Signing and
Encryption (COSE) defines a set of security services for CBOR. This
document defines a countersignature algorithm along with the needed
header parameters and CBOR tags for COSE.
Contributing to this document
This note is to be removed before publishing as an RFC.
The source for this draft is being maintained in GitHub. Suggested
changes should be submitted as pull requests at https://github.com/
cose-wg/countersign. 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 https://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 10 April 2021.
Schaad & Housley Expires 10 April 2021 [Page 1]
Internet-Draft COSE Structure October 2020
Copyright Notice
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document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Terminology . . . . . . . . . . . . . . . . 3
1.2. CBOR Grammar . . . . . . . . . . . . . . . . . . . . . . 4
1.3. Document Terminology . . . . . . . . . . . . . . . . . . 4
2. Countersignature Header Parameters . . . . . . . . . . . . . 5
3. Version 2 Countersignatures . . . . . . . . . . . . . . . . . 6
3.1. Full Countersignatures . . . . . . . . . . . . . . . . . 7
3.2. Abbreviated Countersignatures . . . . . . . . . . . . . . 8
3.3. Signing and Verification Process . . . . . . . . . . . . 8
4. CBOR Encoding Restrictions . . . . . . . . . . . . . . . . . 10
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
5.1. CBOR Tag Assignment . . . . . . . . . . . . . . . . . . . 10
5.2. COSE Header Parameters Registry . . . . . . . . . . . . . 11
6. Security Considerations . . . . . . . . . . . . . . . . . . . 11
7. Implementation Status . . . . . . . . . . . . . . . . . . . . 13
7.1. Author's Versions . . . . . . . . . . . . . . . . . . . . 14
7.2. COSE Testing Library . . . . . . . . . . . . . . . . . . 14
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.1. Normative References . . . . . . . . . . . . . . . . . . 15
8.2. Informative References . . . . . . . . . . . . . . . . . 15
Appendix A. Examples . . . . . . . . . . . . . . . . . . . . . . 16
A.1. Examples of Signed Messages . . . . . . . . . . . . . . . 17
A.1.1. Countersignature . . . . . . . . . . . . . . . . . . 17
A.2. Examples of Enveloped Messages . . . . . . . . . . . . . 18
A.2.1. Countersignature on Encrypted Content . . . . . . . . 18
A.3. Examples of Encrypted Messages . . . . . . . . . . . . . 19
A.4. Examples of MACed Messages . . . . . . . . . . . . . . . 19
A.5. Examples of MAC0 Messages . . . . . . . . . . . . . . . . 20
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 20
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 20
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