Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile
RFC 3279
Network Working Group W. Polk
Request for Comments: 3279 NIST
Obsoletes: 2528 R. Housley
Category: Standards Track RSA Laboratories
L. Bassham
NIST
April 2002
Algorithms and Identifiers for the
Internet X.509 Public Key Infrastructure
Certificate and Certificate Revocation List (CRL) Profile
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2002). All Rights Reserved.
Abstract
This document specifies algorithm identifiers and ASN.1 encoding
formats for digital signatures and subject public keys used in the
Internet X.509 Public Key Infrastructure (PKI). Digital signatures
are used to sign certificates and certificate revocation list (CRLs).
Certificates include the public key of the named subject.
Table of Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . 2
2 Algorithm Support . . . . . . . . . . . . . . . . . . . . 3
2.1 One-Way Hash Functions . . . . . . . . . . . . . . . . 3
2.1.1 MD2 One-Way Hash Functions . . . . . . . . . . . . . 3
2.1.2 MD5 One-Way Hash Functions . . . . . . . . . . . . . 4
2.1.3 SHA-1 One-Way Hash Functions . . . . . . . . . . . . 4
2.2 Signature Algorithms . . . . . . . . . . . . . . . . . 4
2.2.1 RSA Signature Algorithm . . . . . . . . . . . . . . . 5
2.2.2 DSA Signature Algorithm . . . . . . . . . . . . . . . 6
2.2.3 Elliptic Curve Digital Signature Algorithm . . . . . 7
2.3 Subject Public Key Algorithms . . . . . . . . . . . . . 7
2.3.1 RSA Keys . . . . . . . . . . . . . . . . . . . . . . 8
2.3.2 DSA Signature Keys . . . . . . . . . . . . . . . . . 9
2.3.3 Diffie-Hellman Key Exchange Keys . . . . . . . . . . 10
Polk, et al. Standards Track [Page 1]
RFC 3279 Algorithms and Identifiers April 2002
2.3.4 KEA Public Keys . . . . . . . . . . . . . . . . . . . 11
2.3.5 ECDSA and ECDH Public Keys . . . . . . . . . . . . . 13
3 ASN.1 Module . . . . . . . . . . . . . . . . . . . . . . 18
4 References . . . . . . . . . . . . . . . . . . . . . . . 24
5 Security Considerations . . . . . . . . . . . . . . . . . 25
6 Intellectual Property Rights . . . . . . . . . . . . . . 26
7 Author Addresses . . . . . . . . . . . . . . . . . . . . 26
8 Full Copyright Statement . . . . . . . . . . . . . . . . 27
1 Introduction
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 [RFC 2119].
This document specifies algorithm identifiers and ASN.1 [X.660]
encoding formats for digital signatures and subject public keys used
in the Internet X.509 Public Key Infrastructure (PKI). This
specification supplements [RFC 3280], "Internet X.509 Public Key
Infrastructure: Certificate and Certificate Revocation List (CRL)
Profile." Implementations of this specification MUST also conform to
RFC 3280.
This specification defines the contents of the signatureAlgorithm,
signatureValue, signature, and subjectPublicKeyInfo fields within
Internet X.509 certificates and CRLs.
This document identifies one-way hash functions for use in the
generation of digital signatures. These algorithms are used in
conjunction with digital signature algorithms.
This specification describes the encoding of digital signatures
generated with the following cryptographic algorithms:
* Rivest-Shamir-Adelman (RSA);
* Digital Signature Algorithm (DSA); and
* Elliptic Curve Digital Signature Algorithm (ECDSA).
This document specifies the contents of the subjectPublicKeyInfo
field in Internet X.509 certificates. For each algorithm, the
appropriate alternatives for the the keyUsage extension are provided.
This specification describes encoding formats for public keys used
with the following cryptographic algorithms:
* Rivest-Shamir-Adelman (RSA);
* Digital Signature Algorithm (DSA);
* Diffie-Hellman (DH);
* Key Encryption Algorithm (KEA);
Polk, et al. Standards Track [Page 2]
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