CFRG Elliptic Curve Diffie-Hellman (ECDH) and Signatures in JSON Object Signing and Encryption (JOSE)
RFC 8037
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RFC - Proposed Standard
(January 2017; No errata)
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Last updated |
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2017-01-24
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Replaces |
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draft-liusvaara-jose-cfrg-curves
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IETF
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plain text
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bibtex
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WG state
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Submitted to IESG for Publication
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Document shepherd |
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Jim Schaad
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Shepherd write-up |
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Show
(last changed 2016-07-20)
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| IESG |
IESG state |
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RFC 8037 (Proposed Standard)
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Consensus Boilerplate |
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Yes
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Responsible AD |
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Kathleen Moriarty
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Send notices to |
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"Jim Schaad" <ietf@augustcellars.com>
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Version Changed - Review Needed
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RFC-Ed-Ack
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Internet Engineering Task Force (IETF) I. Liusvaara
Request for Comments: 8037 Independent
Category: Standards Track January 2017
ISSN: 2070-1721
CFRG Elliptic Curve Diffie-Hellman (ECDH) and Signatures
in JSON Object Signing and Encryption (JOSE)
Abstract
This document defines how to use the Diffie-Hellman algorithms
"X25519" and "X448" as well as the signature algorithms "Ed25519" and
"Ed448" from the IRTF CFRG elliptic curves work in JSON Object
Signing and Encryption (JOSE).
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/rfc8037.
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.
Liusvaara Standards Track [Page 1]
RFC 8037 CFRG ECDH and Signatures in JOSE January 2017
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Key Type "OKP" . . . . . . . . . . . . . . . . . . . . . . . 3
3. Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1. Signatures . . . . . . . . . . . . . . . . . . . . . . . 4
3.1.1. Signing . . . . . . . . . . . . . . . . . . . . . . . 4
3.1.2. Verification . . . . . . . . . . . . . . . . . . . . 4
3.2. ECDH-ES . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2.1. Performing the ECDH Operation . . . . . . . . . . . . 5
4. Security Considerations . . . . . . . . . . . . . . . . . . . 5
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.1. Normative References . . . . . . . . . . . . . . . . . . 8
6.2. Informative References . . . . . . . . . . . . . . . . . 8
Appendix A. Examples . . . . . . . . . . . . . . . . . . . . . . 9
A.1. Ed25519 Private Key . . . . . . . . . . . . . . . . . . . 9
A.2. Ed25519 Public Key . . . . . . . . . . . . . . . . . . . 9
A.3. JWK Thumbprint Canonicalization . . . . . . . . . . . . . 9
A.4. Ed25519 Signing . . . . . . . . . . . . . . . . . . . . . 10
A.5. Ed25519 Validation . . . . . . . . . . . . . . . . . . . 11
A.6. ECDH-ES with X25519 . . . . . . . . . . . . . . . . . . . 11
A.7. ECDH-ES with X448 . . . . . . . . . . . . . . . . . . . . 12
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 14
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 14
1. Introduction
The Internet Research Task Force (IRTF) Crypto Forum Research Group
(CFRG) selected new Diffie-Hellman algorithms ("X25519" and "X448";
[RFC7748]) and signature algorithms ("Ed25519" and "Ed448";
[RFC8032]) for asymmetric key cryptography. This document defines
how to use those algorithms in JOSE in an interoperable manner.
This document defines the conventions to use in the context of
[RFC7515], [RFC7516], and [RFC7517].
While the CFRG also defined two pairs of isogenous elliptic curves
that underlie these algorithms, these curves are not directly
exposed, as the algorithms laid on top are sufficient for the
purposes of JOSE and are much easier to use.
All inputs to and outputs from the Elliptic Curve Diffie-Hellman
(ECDH) and signature functions are defined to be octet strings, with
the exception of outputs of verification functions, which are
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