RFC2314 - PKCS #10: Certification Request Syntax Version 1.5

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　　Network Working Group B. Kaliski
Request for Comments: 2314 RSA Laboratories East
Category: Informational March 1998

PKCS #10: Certification Request Syntax
Version 1.5

Status of this Memo

This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (1998). All Rights Reserved.

Overview

This document describes a syntax for certification requests.

1. Scope

A certification request consists of a distinguished name, a public
key, and optionally a set of attributes, collectively signed by the
entity requesting certification. Certification requests are sent to a
certification authority, who transforms the request to an X.509
public-key certificate, or a PKCS #6 extended certificate. (In what
form the certification authority returns the newly signed certificate
is outside the scope of this document. A PKCS #7 message is one
possibility.)

The intention of including a set of attributes is twofold: to provide
other information about a given entity, such as the postal address to
which the signed certificate should be returned if electronic mail is
not available, or a "challenge password" by which the entity may
later request certificate revocation; and to provide attributes for a
PKCS #6 extended certificate. A non-exhaustive list of attributes is
given in PKCS #9.

Certification authorities may also require non-electronic forms of
request and may return non-electronic replies. It is expected that
descriptions of such forms, which are outside the scope of this
document, will be available from the certification authority.

The preliminary intended application of this document is to support
PKCS #7 cryptographic messages, but is expected that other
applications will be developed.

2. References

PKCS #1 RSA Laboratories. PKCS #1: RSA Encryption
Standard. Version 1.5, November 1993.

PKCS #6 RSA Laboratories. PKCS #6: Extended-Certificate
Syntax. Version 1.5, November 1993.

PKCS #7 RSA Laboratories. PKCS #7: Cryptographic Message
Syntax. Version 1.5, November 1993.

PKCS #9 RSA Laboratories. PKCS #9: Selected Attribute
Types. Version 1.1, November 1993.

RFC1424 Kaliski, B., "Privacy Enhancement for
Internet Electronic Mail: Part IV: Key
Certification and Related Services," RFC1424,
February 1993.

X.208 CCITT. Recommendation X.208: Specification of
Abstract Syntax Notation One (ASN.1). 1988.

X.209 CCITT. Recommendation X.209: Specification of
Basic Encoding Rules for Abstract Syntax Notation
One (ASN.1). 1988.

X.500 CCITT. Recommendation X.500: The Directory--
Overview of Concepts, Models and
Services. 1988.

X.501 CCITT. Recommendation X.501: The Directory--
Models. 1988.

X.509 CCITT. Recommendation X.509: The Directory--
Authentication Framework. 1988.

3. Definitions

For the purposes of this document, the following definitions apply.

AlgorithmIdentifier: A type that identifies an algorithm (by object
identifier) and any associated parameters. This type is defined in
X.509.

Attribute: A type that contains an attribute type (specified by
object identifier) and one or more attribute values. This type is
defined in X.501.

ASN.1: Abstract Syntax Notation One, as defined in X.208.

BER: Basic Encoding Rules, as defined in X.209.

Certificate: A type that binds an entity's distinguished name to a
public key with a digital signature. This type is defined in X.509.
This type also contains the distinguished name of the certificate
issuer (the signer), an issuer- specific serial number, the issuer's
signature algorithm identifier, and a validity period.

DER: Distinguished Encoding Rules for ASN.1, as defined in X.509,
Section 8.7.

Name: A type that uniquely identifies or "distinguishes" objects in a
X.500 directory. This type is defined in X.501. In an X.509
certificate, the type identifies the certificate issuer and the
entity whose public key is certified.

4. Symbols and abbreviations

No symbols or abbreviations are defined in this document.

5. General overview

The next section specifies certification request syntax.

This document exports one type, CertificationRequest.

6. Certification request syntax

This section gives the syntax for certification requests.

A certification request consists of three parts: "certification
request information," a signature algorithm identifier, and a digital
signature on the certification request information. The certification
request information consists of the entity's distinguished name, the
entity's public key, and a set of attributes providing other
information about the entity.

The process by which a certification request is constructed involves
the following steps:

1. A CertificationRequestInfo value containing a
distinguished name, a public key, and optionally a set of
attributes is constructed by an entity.

2. The CertificationRequestInfo value is signed with
the entity's private key. (See Section 6.2.)

3. The CertificationRequestInfo value, a signature
algorithm identifier, and the entity's signature are
collected together into a CertificationRequest value,
defined below.

A certification authority fulfills the request by verifying the
entity's signature, and, if it is valid, constructing a X.509
certificate from the distinguished name and public key, as well as an
issuer name, serial number, validity period, and signature algorithm
of the certification authority's choice. If the certification request
contains a PKCS #9 extended-certificate-attributes attribute, the
certification authority also constructs a PKCS #6 extended
certificate from the X.509 certificate and the extended-certificate-
attributes attribute value.

In what form the certification authority returns the new certificate
is outside the scope of this document. One possibility is a PKCS #7
cryptographic message with content type signedData, following the
degenerate case where there are no signers. The return message may
include a certification path from the new certificate to the
certification authority. It may also include other certificates such
as cross-certificates that the certification authority considers
helpful, and it may include certificate-revocation lists (CRLs).
Another possibility is that the certification authority inserts the
new certificate into a central database.

This section is divided into two parts. The first part describes the
certification-request-information type CertificationRequestInfo, and
the second part describes the top-level type CertificationRequest.

Notes.

1. An entity would typically send a certification
request after generating a public-key/private-key pair, but
may also do so after a change in the entity's distinguished
name.

2. The signature on the certification request
prevents an entity from requesting a certificate with
another party's public key. Such an attack would give the
entity the minor ability to pretend to be the originator of
any message signed by the other party. This attack is
significant only if the entity does not know the message
being signed, and the signed part of the message does not
identify the signer. The entity would still not be able to
decrypt messages intended for the other party, of course.

3. How the entity sends the certification request to
a certification authority is outside the scope of this
document. Both paper and electronic forms are possible.

4. This document is not compatible with the
certification request syntax for Privacy-Enhanced Mail, as
described in RFC1424. The syntax in this document differs
in three respects: It allows a set of attributes; it does
not include issuer name, serial number, or validity period;
and it does not require an "innocuous" message to be
signed. The syntax in this document is designed to minimize
request size, an important constraint for those
certification authorities accepting requests on paper.

6.1 CertificationRequestInfo

Certification request information shall have ASN.1 type
CertificationRequestInfo:

CertificationRequestInfo ::= SEQUENCE {
version Version,
subject Name,
subjectPublicKeyInfo SubjectPublicKeyInfo,
attributes [0] IMPLICIT Attributes }

Version ::= INTEGER

Attributes ::= SET OF Attribute

The fields of type CertificationRequestInfo have the following
meanings:

o version is the version number, for compatibility
with future revisions of this document. It shall be 0 for
this version of the document.

o subject is the distinguished name of the
certificate subject (the entity whose public key is to be
certified).

o subjectPublicKeyInfo contains information about
the public key being certified. The information identifies
the entity's public-key algorithm (and any associated
parameters); examples of public-key algorithms include
X.509's rsa and PKCS #1's rsaEncryption. The information
also includes a bit-string representation of the entity's
public key. For both public-key algorithms just mentioned,
the bit string contains the BER encoding of a value of
X.509/PKCS #1 type RSAPublicKey.

o attributes is a set of attributes providing
additional information about the subject of the
certificate. Some attribute types that might be useful here
are defined in PKCS #9. An example is the challenge-
password attribute, which specifies a password by which the
entity may request that the certificate revocation. Another
example is the extended-certificate-attributes attribute,
which specifies attributes for a PKCS #6 extended
certificate.

6.2 CertificationRequest

A certification request shall have ASN.1 type CertificationRequest:

CertificationRequest ::= SEQUENCE {
certificationRequestInfo CertificationRequestInfo,
signatureAlgorithm SignatureAlgorithmIdentifier,
signature Signature }

SignatureAlgorithmIdentifier ::= AlgorithmIdentifier

Signature ::= BIT STRING

The fields of type CertificationRequest have the following meanings:

o certificateRequestInfo is the "certification
request information." It is the value being
signed.

o signatureAlgorithm identifies the signature
algorithm (and any associated parameters) under
which the certification-request information is
signed. Examples include PKCS #1's
md2WithRSAEncryption and md5WithRSAEncryption.

o signature is the result of signing the
certification request information with the
certification request subject's private key.

The signature process consists of two steps:

1. The value of the certificationRequestInfo field is
DER encoded, yielding an octet string.

2. The result of step 1 is signed with the
certification request subject's private key under
the specified signature algorithm, yielding a bit
string, the signature.

Note. The syntax for CertificationRequest could equivalently be
written with the X.509 SIGNED macro:

CertificationRequest ::= SIGNED CertificateRequestInfo

Security Considerations

Security issues are discussed throughout this memo.

Revision history

Version 1.0

Version 1.0 is the initial version.

Acknowledgements

This document is based on a contribution of RSA Laboratories, a
division of RSA Data Security, Inc. Any substantial use of the text
from this document must acknowledge RSA Data Security, Inc. RSA Data
Security, Inc. requests that all material mentioning or referencing
this document identify this as "RSA Data Security, Inc. PKCS #10".

Author's Address

Burt Kaliski
RSA Laboratories East
20 Crosby Drive
Bedford, MA 01730

Phone: (617) 687-7000
EMail: burt@rsa.com

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