Ed25519 and Ed448 public key algorithms for the Secure Shell (SSH) protocol
draft-ietf-curdle-ssh-ed25519-ed448-07

Document Type Active Internet-Draft (curdle WG)
Last updated 2018-10-15
Replaces draft-ietf-curdle-ssh-ed25519
Stream IETF
Intended RFC status Proposed Standard
Formats plain text xml pdf html bibtex
Stream WG state Submitted to IESG for Publication
Document shepherd Daniel Migault
Shepherd write-up Show (last changed 2018-10-15)
IESG IESG state Publication Requested
Consensus Boilerplate Yes
Telechat date
Responsible AD Eric Rescorla
Send notices to Daniel Migault <daniel.migaultf@ericsson.com>
Internet Engineering Task Force                                B. Harris
Internet-Draft
Intended status: Standards Track                           L. Velvindron
Expires: April 18, 2019                                    cyberstorm.mu
                                                        October 15, 2018

   Ed25519 and Ed448 public key algorithms for the Secure Shell (SSH)
                                protocol
                 draft-ietf-curdle-ssh-ed25519-ed448-07

Abstract

   This document describes the use of the Ed25519 and Ed448 digital
   signature algorithm in the Secure Shell (SSH) protocol.

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 April 18, 2019.

Copyright Notice

   Copyright (c) 2018 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.

Harris & Velvindron      Expires April 18, 2019                 [Page 1]
Internet-Draft               Ed25519 for SSH                October 2018

1.  Introduction

   Secure Shell (SSH) [RFC4251] is a secure remote-login protocol.  It
   provides for an extensible variety of public key algorithms for
   identifying servers and users to one another.  Ed25519 [RFC8032] is a
   digital signature system.  OpenSSH 6.5 [OpenSSH-6.5] introduced
   support for using Ed25519 for server and user authentication and was
   then followed by other SSH implementations.

   This document describes the method implemented by OpenSSH and others,
   and formalizes its use of the name "ssh-ed25519".  Additionally, it
   also describes the use of Ed448 and formalizes its use of the name
   "ssh-ed448".

   [TO BE REMOVED: Please send comments on this draft to
   curdle@ietf.org.]

2.  Conventions Used in This Document

   The descriptions of key and signature formats use the notation
   introduced in [RFC4251], Section 3 [RFC4251] and the string data type
   from [RFC4251], Section 5 [RFC4251].

3.  Public Key Algorithm

   This document describes a public key algorithm for use with SSH in
   accordance with [RFC4253], Section 6.6 [RFC4253].  The name of the
   algorithm is "ssh-ed25519".  This algorithm only supports signing and
   not encryption.

   Additionally, this document describes another public key algorithm.
   The name of the algorithm is "ssh-ed448".  This algorithm only
   supports signing and not encryption.

4.  Public Key Format

   The "ssh-ed25519" key format has the following encoding:

   string    "ssh-ed25519"
   string    key

   Here 'key' is the 32-octet public key described by [RFC8032],
   Section 5.1.5 [RFC8032].

   The "ssh-ed448" key format has the following encoding:

   string    "ssh-ed448"
   string    key

Harris & Velvindron      Expires April 18, 2019                 [Page 2]
Internet-Draft               Ed25519 for SSH                October 2018

   Here 'key' is the 57-octet public key described by [RFC8032],
   Section 5.2.5 [RFC8032].

5.  Signature Algorithm

   Signatures are generated according to the procedure in [RFC8032],
   Section 5.2.6 [RFC8032].

6.  Signature Format

   The "ssh-ed25519" key format has the following encoding:

   string    "ssh-ed25519"
   string    signature

   Here 'signature' is the 64-octet signature produced in accordance
   with [RFC8032], Section 5.1.6 [RFC8032].

   The "ssh-ed448" key format has the following encoding:

   string    "ssh-ed448"
   string    signature

   Here 'signature' is the 57-octet signature produced in accordance
   with [RFC8032], Section 5.2.6 [RFC8032].

7.  Verification Algorithm

   ED25519 signatures are verified according to the procedure in
   [RFC8032], Section 5.1.7 [RFC8032].

   ED448 signatures are verified according to the procedure in
   [RFC8032], Section 5.2.7 [RFC8032].

8.  SSHFP DNS resource records
Show full document text