Ed25519 public key algorithm for the Secure Shell (SSH) protocol
draft-ietf-curdle-ssh-ed25519-01

Document Type Active Internet-Draft (curdle WG)
Last updated 2017-08-07
Replaces draft-bjh21-ssh-ed25519
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Internet Engineering Task Force                                B. Harris
Internet-Draft
Updates: 4250 (if approved)                                L. Velvindron
Intended status: Standards Track                              Hackers.mu
Expires: February 7, 2018                                 August 6, 2017

    Ed25519 public key algorithm for the Secure Shell (SSH) protocol
                    draft-ietf-curdle-ssh-ed25519-01

Abstract

   This document describes the use of the Ed25519 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
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   This Internet-Draft will expire on February 7, 2018.

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
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Harris & Velvindron     Expires February 7, 2018                [Page 1]
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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.
   Compatible support for Ed25519 has since been added to other SSH
   implementations.

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

   [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.

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].

5.  Signature Algorithm

   Signatures are generated according to the procedure in [RFC8032],
   Section 5.1.6 [RFC8032].

Harris & Velvindron     Expires February 7, 2018                [Page 2]
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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].

7.  Verification Algorithm

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

8.  SSHFP DNS resource records

   The generation of SSHFP resource records for "ssh-ed25519" keys is
   described in [RFC7479].

9.  IANA Considerations

   This document augments the Public Key Algorithm Names in [RFC4250],
   Section 4.6.2 [RFC4250].

   IANA is requested to add to the Public Key Algorithm Names registry
   [IANA-PKA] with the following entry:
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