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Network Working Group S. Josefsson
Internet-Draft SJD AB
Intended status: Informational October 12, 2015
Expires: April 14, 2016


Using Curve25519 and Curve448 in PKIX
draft-josefsson-pkix-newcurves-01

Abstract

This document specify "named curve" object identifiers for the
Curve25519 and Curve448 curves, for use in various X.509 PKIX
structures.

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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Drafts is at http://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
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material or to cite them other than as "work in progress."

This Internet-Draft will expire on April 14, 2016.

Copyright Notice

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document authors. All rights reserved.

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described in the Simplified BSD License.





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1. Introduction

In [I-D.irtf-cfrg-curves], 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.

This RFC define ASN.1 "named curve" object identifiers for Curve25519
and Curve448, for use in the Internet X.509 PKI [RFC5280].

Rather than defining a new subject public key format for these two
curves, this document re-use the existing ECDSA/ECDH public-key
contained (described in section 2.3.5 of [RFC3279]) and introduce two
new "named curve" OIDs. This approach is the same as for the
Brainpool curves [RFC5639].

2. Requirements Terminology

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].

3. Curve25519 and Curve448 Named Curve Identifier

Certificates conforming to [RFC5280] may convey a public key for any
public key algorithm. The certificate indicates the algorithm
through an algorithm identifier. This algorithm identifier is an OID
and optionally associated parameters. Section 2.3.5 of [RFC3279]
describe ECDSA/ECDH public keys, specifying the id-ecPublicKey OID.
This OID has the associated EcpkParameters parameters structure,
which contains the namedCurve CHOICE. Here we introduce two new OIDs
for use in the namedCurve field.

id-Curve25519 OBJECT IDENTIFIER ::= { 1.3.6.1.4.1.11591.15.1 }
id-Curve448 OBJECT IDENTIFIER ::= { 1.3.6.1.4.1.11591.15.2 }
id-Curve25519ph OBJECT IDENTIFIER ::= { 1.3.6.1.4.1.11591.15.3 }
id-Curve448ph OBJECT IDENTIFIER ::= { 1.3.6.1.4.1.11591.15.4 }

The OID id-Curve25519 refers to Curve25519. The OID id-Curve448
refers to Curve448. Both curves are described in
[I-D.irtf-cfrg-curves]. The OIDs id-Curve25519ph and id-Curve448ph
refers to Curve25519 and Curve448 when used with pre-hashing as
Ed25519ph and Ed448ph described in [I-D.irtf-cfrg-eddsa].

The public key value encoded into the ECPoint value is the raw binary
values described in [I-D.irtf-cfrg-curves].





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4. Acknowledgements

Text and/or inspiration were drawn from [RFC5280], [RFC3279],
[RFC5480], and [RFC5639].

Several people suggested the utility of specifying OIDs for encoding
Curve25519/Curve448 public keys into PKIX certificates, the editor of
this document cannot take credit for this idea.

5. IANA Considerations

None.

6. Security Considerations

The security considerations of [RFC3279], [RFC5280], [RFC5480] and
[I-D.irtf-cfrg-curves] apply accordingly.

7. References

7.1. Normative References

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.

[RFC3279] Bassham, L., Polk, W., and R. Housley, "Algorithms and
Identifiers for the Internet X.509 Public Key
Infrastructure Certificate and Certificate Revocation List
(CRL) Profile", RFC 3279, April 2002.

[RFC5280] Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
Housley, R., and W. Polk, "Internet X.509 Public Key
Infrastructure Certificate and Certificate Revocation List
(CRL) Profile", RFC 5280, May 2008.

[RFC5480] Turner, S., Brown, D., Yiu, K., Housley, R., and T. Polk,
"Elliptic Curve Cryptography Subject Public Key
Information", RFC 5480, March 2009.

[I-D.irtf-cfrg-curves]
Langley, A. and M. Hamburg, "Elliptic Curves for
Security", draft-irtf-cfrg-curves-10 (work in progress),
October 2015.

[I-D.irtf-cfrg-eddsa]
Josefsson, S. and I. Liusvaara, "Edwards-curve Digital
Signature Algorithm (EdDSA)", draft-irtf-cfrg-eddsa-00
(work in progress), October 2015.



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7.2. Informative References

[RFC5639] Lochter, M. and J. Merkle, "Elliptic Curve Cryptography
(ECC) Brainpool Standard Curves and Curve Generation", RFC
5639, March 2010.

Author's Address

Simon Josefsson
SJD AB

Email: simon@josefsson.org







































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