Ed25519 and Ed 448 public key algorithms for the Secure Shell (SSH) protocol
draft-ietf-curdle-ssh-ed25519-ed448-02

Document Type Active Internet-Draft (curdle WG)
Last updated 2018-08-12
Replaces draft-ietf-curdle-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 13, 2019                               August 12, 2018

  Ed25519 and Ed 448 public key algorithms for the Secure Shell (SSH)
                                protocol
                 draft-ietf-curdle-ssh-ed25519-ed448-02

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
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   This Internet-Draft will expire on February 13, 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
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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 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

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   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
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