Alternative Elliptic Curve Representations
draft-ietf-lwig-curve-representations-20
| Document | Type | Active Internet-Draft (lwig WG) | |
|---|---|---|---|
| Author | Rene Struik | ||
| Last updated | 2021-02-17 | ||
| Replaces | draft-struik-lwig-curve-representations | ||
| Stream | Internet Engineering Task Force (IETF) | ||
| Intended RFC status | Proposed Standard | ||
| Formats | plain text pdf htmlized (tools) htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Mohit Sethi | ||
| Shepherd write-up | Show (last changed 2021-02-03) | ||
| IESG | IESG state | IESG Evaluation | |
| Action Holders |
(None)
|
||
| Consensus Boilerplate | Yes | ||
| Telechat date |
Needs 8 more YES or NO OBJECTION positions to pass. |
||
| Responsible AD | Erik Kline | ||
| Send notices to | Mohit Sethi <mohit.m.sethi@ericsson.com> | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA expert review state | Issues identified | ||
| IANA expert review comments | jose related expert reviews - ok cose related expert reviews - pending | ||
lwig R. Struik
Internet-Draft Struik Security Consultancy
Intended status: Standards Track February 17, 2021
Expires: August 21, 2021
Alternative Elliptic Curve Representations
draft-ietf-lwig-curve-representations-20
Abstract
This document specifies how to represent Montgomery curves and
(twisted) Edwards curves as curves in short-Weierstrass form and
illustrates how this can be used to carry out elliptic curve
computations using existing implementations of, e.g., ECDSA and ECDH
using NIST prime curves. We also provide extensive background
material that may be useful for implementers of elliptic curve
cryptography.
Requirements Language
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.
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 August 21, 2021.
Struik Expires August 21, 2021 [Page 1]
Internet-Draft lwig-curve-representations February 2021
Copyright Notice
Copyright (c) 2021 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
(https://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. Fostering Code Reuse with New Elliptic Curves . . . . . . . . 5
2. Specification of Wei25519 . . . . . . . . . . . . . . . . . . 6
3. Use of Representation Switches . . . . . . . . . . . . . . . 6
4. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1. Implementation of X25519, Specification of ECDH25519 . . 7
4.2. Implementation of Ed25519 . . . . . . . . . . . . . . . . 9
4.3. Specification of ECDSA25519 . . . . . . . . . . . . . . . 9
4.4. Other Uses (Wei448, ECDH448, ECDSA448, and Others) . . . 10
5. Caveats . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1. Wire Format . . . . . . . . . . . . . . . . . . . . . . . 11
5.2. Representation Conventions . . . . . . . . . . . . . . . 11
5.3. Domain Parameters . . . . . . . . . . . . . . . . . . . . 11
6. Implementation Considerations . . . . . . . . . . . . . . . . 12
7. Implementation Status . . . . . . . . . . . . . . . . . . . . 13
8. Security Considerations . . . . . . . . . . . . . . . . . . . 14
9. Privacy Considerations . . . . . . . . . . . . . . . . . . . 15
10. Using Wei25519 and Wei448 with COSE and JOSE . . . . . . . . 16
10.1. Using Wei25519 and Wei448 Keys with COSE and JOSE . . . 16
10.1.1. Encoding of Short-Weierstrass Curves with COSE . . . 16
10.1.2. Encoding of Short-Weierstrass Curves with JOSE . . . 17
10.2. Using ECDSA25519 and ECDSA448 with COSE and JOSE . . . . 18
10.2.1. Encoding of ECDSA Instantiations with COSE . . . . . 19
10.2.2. Encoding of ECDSA Instantiations with JOSE . . . . . 20
10.3. Using ECDH25519 and ECDH448 with COSE and JOSE . . . . . 21
10.3.1. Encoding of co-factor ECDH with COSE . . . . . . . . 22
10.3.2. Encoding of co-factor ECDH with JOSE . . . . . . . . 22
11. Using Wei25519 and Wei448 with PKIX and CMS . . . . . . . . . 22
11.1. Encoding of Short-Weierstrass Curves with PKIX . . . . . 22
11.2. Encoding of ECDSA Instantiations with PKIX . . . . . . . 23
11.3. Encoding of co-factor ECDH and Other Algorithms with
PKIX . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Struik Expires August 21, 2021 [Page 2]
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