EdDSA, Ed25519, Ed448, Curve25519 and Curve448 for X.509
draft-ietf-curdle-pkix-00

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Network Working Group                                       S. Josefsson
Internet-Draft                                                    SJD AB
Intended status: Standards Track                           April 8, 2016
Expires: October 10, 2016

        EdDSA, Ed25519, Ed448, Curve25519 and Curve448 for X.509
                       draft-ietf-curdle-pkix-00

Abstract

   This document specify algorithm identifiers and ASN.1 encoding
   formats for EdDSA digital signatures, subject public keys, and a
   "named curve" object identifier, used in the Internet X.509 Public
   Key Infrastructure.  Parameters for Ed25519, Ed25519ph, Ed448,
   Ed448ph, Curve25519 and Curve448 are defined.

Status of This Memo

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   This Internet-Draft will expire on October 10, 2016.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Josefsson               Expires October 10, 2016                [Page 1]
Internet-Draft            Safe curves for X.509               April 2016

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Terminology  . . . . . . . . . . . . . . . . . .   3
   3.  Curve25519 and Curve448 Named Curve Identifier  . . . . . . .   3
   4.  Subject Public Key Information Fields . . . . . . . . . . . .   3
   5.  EdDSA Public Keys . . . . . . . . . . . . . . . . . . . . . .   4
   6.  Key Usage Bits  . . . . . . . . . . . . . . . . . . . . . . .   5
   7.  EdDSA Signatures  . . . . . . . . . . . . . . . . . . . . . .   5
   8.  Private Key Format  . . . . . . . . . . . . . . . . . . . . .   6
   9.  Human Readable Algorithm Names  . . . . . . . . . . . . . . .   7
   10. ASN.1 Module  . . . . . . . . . . . . . . . . . . . . . . . .   7
   11. Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     11.1.  Example Ed25519ph Public Key . . . . . . . . . . . . . .   8
     11.2.  Example Ed25519ph Certificate  . . . . . . . . . . . . .   8
     11.3.  Example Ed25519ph Private Key  . . . . . . . . . . . . .  10
   12. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   13. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   14. Security Considerations . . . . . . . . . . . . . . . . . . .  11
   15. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     15.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     15.2.  Informative References . . . . . . . . . . . . . . . . .  12
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   In [RFC7748], the elliptic curves Curve25519 and Curve448 are
   described.  They are designed with performance and security in mind.
   The curves may be used for Diffie-Hellman and Digital Signature
   operations.  In [I-D.irtf-cfrg-eddsa] the elliptic curve signature
   system EdDSA is described and the recommended choice of curves
   Ed25519/Ed448 are chosen.  For each curve, two modes are defined, the
   PureEdDSA mode without pre-hashing (Ed25519 and Ed448), and the
   HashEdDSA mode with pre-hashing (Ed25519ph and Ed448ph).

   This RFC defines ASN.1 object identifiers for EdDSA for use in the
   Internet X.509 PKI [RFC5280], and parameters for Ed25519, Ed25519ph,
   Ed448 and Ed448ph.  This document serves a similar role as [RFC3279]
   does for RSA (and more), [RFC4055] for RSA-OAEP/PSS, and [RFC5758]
   for SHA2-based (EC)DSA.  This document also specify ASN.1 "named
   curve" object identifiers for Curve25519 and Curve448, similar to
   what is done in [RFC5639].  This allows the curves to be used and
   referenced in PKIX standards and software, in particular enabling re-
   use of existing constructs already defined for ECDSA/ECDH but for the
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