--- 1/draft-ietf-curdle-ssh-ed25519-ed448-01.txt 2018-08-13 00:13:08.118626392 -0700 +++ 2/draft-ietf-curdle-ssh-ed25519-ed448-02.txt 2018-08-13 00:13:08.134626777 -0700 @@ -1,20 +1,20 @@ Internet Engineering Task Force B. Harris Internet-Draft Updates: 4250 (if approved) L. Velvindron Intended status: Standards Track Hackers.mu -Expires: January 3, 2019 July 2, 2018 +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-ed448-01 + 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. @@ -22,21 +22,21 @@ 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 January 3, 2019. + 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 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 @@ -45,24 +45,22 @@ 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. 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. Ed448 [RFC8032] is another digital signature - system. + 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 @@ -126,103 +123,136 @@ 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 + Usage and generation of SSHFP DNS resource record is described in + [RFC4255]. The generation of SSHFP resource records for "ssh- + ed25519" keys is described in [RFC7479]. This section illustrates + the generation of SSHFP resource records for "ssh-ed448" keys and the + document specifies the corresponding Ed448 code point to the "SSHFP + RR Types for public key algorithms" IANA registry. + The generation of SSHFP resource records for "ssh-ed25519" keys is described in [RFC7479]. The generation of SSHFP resource records for "ssh-ed448" keys is described as follows. the SSHFP Resource Record for the Ed448 public key with SHA-256 - fingerprint would be example be: ssh.hackers.mu IN SSHFP 5 2 ( - a87f1b687ac0e57d2a081a2f2826723 34d90ed316d2b818ca9580ea384d924 01 ) + fingerprint would be example be: + + ssh.hackers.mu. IN SSHFP TBD 2 ( a87f1b687ac0e57d2a081a2f2826723 + 34d90ed316d2b818ca9580ea384d924 01 ) + + The 2 here indicates SHA-256 [RFC6594]. 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: Public Key Algorithm Name Reference ------------------------- ---------- ssh-ed25519 This Draft ssh-ed448 This Draft - IANA must add the following entry to the "SSHFP RR Types for public - key algorithms" registry: + IANA is requested to add the following entry to the "SSHFP RR Types + for public key algorithms" registry [IANA-SSHFP]: +--------+-------------+------------+ | Value | Description | Reference | +--------+-------------+------------+ - | 5 | Ed448 | [this-draft] | + | TBD | Ed448 | [this-draft] | +--------+-------------+------------+ + We suggest 5 as value. + [TO BE REMOVED: This registration should take place at the following location: ] 10. Security Considerations The security considerations in [RFC4251], Section 9 [RFC4251] apply to all SSH implementations, including those using Ed25519 and Ed448. - The security considerations in [RFC8032], Section 8 [RFC8032] apply - to all uses of Ed25519 and Ed448 including those in SSH. + The security considerations in [RFC8032], Section 8 [RFC8032] and + [RFC7479] apply to all uses of Ed25519 and Ed448 including those in + SSH. 11. Acknowledgements The OpenSSH implementation of Ed25519 in SSH was written by Markus - Friedl. + Friedl. We are also grateful to Mark Baushke and Daniel Migault for + their comments. 12. References 12.1. Normative References [RFC4250] Lehtinen, S. and C. Lonvick, Ed., "The Secure Shell (SSH) Protocol Assigned Numbers", RFC 4250, DOI 10.17487/RFC4250, January 2006, . [RFC4251] Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH) Protocol Architecture", RFC 4251, DOI 10.17487/RFC4251, January 2006, . [RFC4253] Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH) Transport Layer Protocol", RFC 4253, DOI 10.17487/RFC4253, January 2006, . + [RFC4255] Schlyter, J. and W. Griffin, "Using DNS to Securely + Publish Secure Shell (SSH) Key Fingerprints", RFC 4255, + DOI 10.17487/RFC4255, January 2006, + . + + [RFC6594] Sury, O., "Use of the SHA-256 Algorithm with RSA, Digital + Signature Algorithm (DSA), and Elliptic Curve DSA (ECDSA) + in SSHFP Resource Records", RFC 6594, + DOI 10.17487/RFC6594, April 2012, + . + [RFC8032] Josefsson, S. and I. Liusvaara, "Edwards-Curve Digital Signature Algorithm (EdDSA)", RFC 8032, DOI 10.17487/RFC8032, January 2017, . 12.2. Informative References [IANA-PKA] Internet Assigned Numbers Authority (IANA), "Secure Shell (SSH) Protocol Parameters: Public Key Algorithm Names", May 2017, . + [IANA-SSHFP] + Internet Assigned Numbers Authority (IANA), "Secure Shell + (SSH) Protocol Parameters: Public Key Algorithm Names", + May 2017, . + [OpenSSH-6.5] Friedl, M., Provos, N., de Raadt, T., Steves, K., Miller, D., Tucker, D., Rice, T., and B. Lindstrom, "OpenSSH 6.5 release notes", January 2014, . [RFC7479] Moonesamy, S., "Using Ed25519 in SSHFP Resource Records", RFC 7479, DOI 10.17487/RFC7479, March 2015, .