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IETF RFC 5480
Elliptic Curve Cryptography Subject Public Key Information
Last modified on Monday, March 9th, 2009
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Network Working Group S. Turner
Request for Comments: 5480 IECA
Updates: 3279 D. Brown
Category: Standards Track Certicom
K. Yiu
Microsoft
R. Housley
Vigil Security
T. Polk
NIST
March 2009
Elliptic Curve Cryptography Subject Public Key Information
 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) 2009 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 in effect on the date of
publication of this document (http://trustee.ietf.org/license-info).
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document.
Abstract
This document specifies the syntax and semantics for the Subject
Public Key Information field in certificates that support Elliptic
Curve Cryptography. This document updates Sections 2.3.5 and 5, and
the ASN.1 module of "Algorithms and Identifiers for the Internet
X.509 Public Key Infrastructure Certificate and Certificate
Revocation List (CRL) Profile", RFC 3279.
Turner, et al. Standards Track PAGE 1 
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
Table of Contents
1. Introduction ....................................................2
1.1. Terminology ................................................3
2. Subject Public Key Information Fields ...........................3
2.1. Elliptic Curve Cryptography Public Key Algorithm
Identifiers ................................................3
2.2. Subject Public Key .........................................7
3. Key Usage Bits ..................................................7
4. Security Considerations .........................................8
5. ASN.1 Considerations ...........................................10
6. IANA Considerations ............................................11
7. Acknowledgments ................................................11
8. References .....................................................11
8.1. Normative References ......................................11
8.2. Informative References ....................................12
Appendix A. ASN.1 Module ..........................................13
1. Introduction
This document specifies the format of the subjectPublicKeyInfo field
in X.509 certificates [PKI] that use Elliptic Curve Cryptography
(ECC). It updates RFC 3279 [PKI-ALG]. This document specifies the
encoding formats for public keys used with the following ECC
algorithms:
o Elliptic Curve Digital Signature Algorithm (ECDSA);
o Elliptic Curve Diffie-Hellman (ECDH) family schemes; and
o Elliptic Curve Menezes-Qu-Vanstone (ECMQV) family schemes.
Two methods for specifying the algorithms that can be used with the
subjectPublicKey are defined. One method allows the key to be used
with any ECC algorithm, while the other method restricts the usage of
the key to specific algorithms. To promote interoperability, this
document indicates which is required to implement for Certification
Authorities (CAs) that implement ECC algorithms and relying parties
that claim to process ECC algorithms.
The ASN.1 [X.680] module in this document includes ASN.1 for ECC
algorithms. It also includes ASN.1 for non-ECC algorithms defined in
[PKI-ALG] and [PKI-ADALG], even though the associated text is
unaffected. By updating all of the ASN.1 from [PKI-ALG] in this
document, implementers only need to use the module found in this
document.
Turner, et al. Standards Track PAGE 2
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
1.1. 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 [MUSTSHOULD].
2. Subject Public Key Information Fields
In the X.509 certificate, the subjectPublicKeyInfo field has the
SubjectPublicKeyInfo type, which has the following ASN.1 syntax:
SubjectPublicKeyInfo ::= SEQUENCE {
algorithm AlgorithmIdentifier,
subjectPublicKey BIT STRING
}
The fields in SubjectPublicKeyInfo have the following meanings:
o algorithm is the algorithm identifier and parameters for the ECC
public key.
o subjectPublicKey is the ECC public key. See Section 2.2.
The AlgorithmIdentifier type, which is included for convenience
[PKI], is defined as follows:
AlgorithmIdentifier ::= SEQUENCE {
algorithm OBJECT IDENTIFIER,
parameters ANY DEFINED BY algorithm OPTIONAL
}
The fields in AlgorithmIdentifier have the following meanings:
o algorithm identifies the cryptographic algorithm with an object
identifier. See Section 2.1.
o parameters, which are optional, are the associated parameters
for the algorithm identifier in the algorithm field. See
Section 2.1.1.
2.1. Elliptic Curve Cryptography Public Key Algorithm Identifiers
The algorithm field in the SubjectPublicKeyInfo structure [PKI]
indicates the algorithm and any associated parameters for the ECC
public key (see Section 2.2). Three algorithm identifiers are
defined in this document:
Turner, et al. Standards Track PAGE 3
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
o id-ecPublicKey indicates that the algorithms that can be used
with the subject public key are unrestricted. The key is only
restricted by the values indicated in the key usage certificate
extension (see Section 3). id-ecPublicKey MUST be supported.
See Section 2.1.1. This value is also included in certificates
when a public key is used with ECDSA.
o id-ecDH indicates that the algorithm that can be used with the
subject public key is restricted to the Elliptic Curve Diffie-
Hellman algorithm. See Section 2.1.2. id-ecDH MAY be
supported.
o id-ecMQV indicates that the algorithm that can be used with the
subject public key is restricted to the Elliptic Curve Menezes-
Qu-Vanstone key agreement algorithm. See Section 2.1.2.
id-ecMQV MAY be supported.
2.1.1. Unrestricted Algorithm Identifier and Parameters
The "unrestricted" algorithm identifier is:
id-ecPublicKey OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) ansi-X9-62(10045) keyType(2) 1 }
The public key (ECPoint) syntax is described in Section 2.2.
The parameter for id-ecPublicKey is as follows and MUST always be
present:
ECParameters ::= CHOICE {
namedCurve OBJECT IDENTIFIER
-- implicitCurve NULL
-- specifiedCurve SpecifiedECDomain
}
-- implicitCurve and specifiedCurve MUST NOT be used in PKIX.
-- Details for SpecifiedECDomain can be found in [X9.62].
-- Any future additions to this CHOICE should be coordinated
-- with ANSI X9.
The fields in ECParameters have the following meanings:
o namedCurve identifies all the required values for a particular
set of elliptic curve domain parameters to be represented by an
object identifier. This choice MUST be supported. See Section
2.1.1.1.
o implicitCurve allows the elliptic curve domain parameters to be
inherited. This choice MUST NOT be used.
Turner, et al. Standards Track PAGE 4
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
o specifiedCurve, which is of type SpecifiedECDomain type (defined
in [X9.62]), allows all of the elliptic curve domain parameters
to be explicitly specified. This choice MUST NOT be used. See
Section 5, "ASN.1 Considerations".
The addition of any new choices in ECParameters needs to be
coordinated with ANSI X9.
The AlgorithmIdentifier within SubjectPublicKeyInfo is the only place
within a certificate where the elliptic curve domain parameters may
be located. If the elliptic curve domain parameters are not present,
then clients MUST reject the certificate.
2.1.1.1. Named Curve
The namedCurve field in ECParameters uses object identifiers to name
well-known curves. This document publishes curve identifiers for the
fifteen NIST-recommended curves [FIPS186-3]. Other documents can
publish other name curve identifiers. The NIST-named curves are:
-- Note that in [X9.62] the curves are referred to as 'ansiX9' as
-- opposed to 'sec'. For example, secp192r1 is the same curve as
-- ansix9p192r1.
-- Note that in [PKI-ALG] the secp192r1 curve was referred to as
-- prime192v1 and the secp256r1 curve was referred to as
-- prime256v1.
-- Note that [FIPS186-3] refers to secp192r1 as P-192, secp224r1 as
-- P-224, secp256r1 as P-256, secp384r1 as P-384, and secp521r1 as
-- P-521.
secp192r1 OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) ansi-X9-62(10045) curves(3)
prime(1) 1 }
sect163k1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 1 }
sect163r2 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 15 }
secp224r1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 33 }
sect233k1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 26 }
Turner, et al. Standards Track PAGE 5
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
sect233r1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 27 }
secp256r1 OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) ansi-X9-62(10045) curves(3)
prime(1) 7 }
sect283k1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 16 }
sect283r1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 17 }
secp384r1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 34 }
sect409k1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 36 }
sect409r1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 37 }
secp521r1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 35 }
sect571k1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 38 }
sect571r1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 39 }
2.1.2. Restricted Algorithm Identifiers and Parameters
Two "restricted" algorithms are defined for key agreement algorithms:
the Elliptic Curve Diffie-Hellman (ECDH) key agreement family schemes
and the Elliptic Curve Menezes-Qu-Vanstone (ECMQV) key agreement
family schemes. Both algorithms are identified by an object
identifier and have parameters. The object identifier varies based
on the algorithm, but the parameters are always ECParameters and they
MUST always be present (see Section 2.1.1).
The ECDH algorithm uses the following object identifier:
id-ecDH OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) schemes(1)
ecdh(12) }
Turner, et al. Standards Track PAGE 6
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
The ECMQV algorithm uses the following object identifier:
id-ecMQV OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) schemes(1)
ecmqv(13) }
2.2. Subject Public Key
The subjectPublicKey from SubjectPublicKeyInfo is the ECC public key.
ECC public keys have the following syntax:
ECPoint ::= OCTET STRING
Implementations of Elliptic Curve Cryptography according to this
document MUST support the uncompressed form and MAY support the
compressed form of the ECC public key. The hybrid form of the ECC
public key from [X9.62] MUST NOT be used. As specified in [SEC1]:
o The elliptic curve public key (a value of type ECPoint that is
an OCTET STRING) is mapped to a subjectPublicKey (a value of
type BIT STRING) as follows: the most significant bit of the
OCTET STRING value becomes the most significant bit of the BIT
STRING value, and so on; the least significant bit of the OCTET
STRING becomes the least significant bit of the BIT STRING.
Conversion routines are found in Sections 2.3.1 and 2.3.2 of
[SEC1].
o The first octet of the OCTET STRING indicates whether the key is
compressed or uncompressed. The uncompressed form is indicated
by 0x04 and the compressed form is indicated by either 0x02 or
0x03 (see 2.3.3 in [SEC1]). The public key MUST be rejected if
any other value is included in the first octet.
3. Key Usage Bits
If the keyUsage extension is present in a Certification Authority
(CA) certificate that indicates id-ecPublicKey in
SubjectPublicKeyInfo, then any combination of the following values
MAY be present:
digitalSignature;
nonRepudiation;
keyAgreement;
keyCertSign; and
cRLSign.
Turner, et al. Standards Track PAGE 7
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
If the CA certificate keyUsage extension asserts keyAgreement, then
it MAY assert either encipherOnly or decipherOnly. However, this
specification RECOMMENDS that if keyCertSign or cRLSign is present,
then keyAgreement, encipherOnly, and decipherOnly SHOULD NOT be
present.
If the keyUsage extension is present in an End Entity (EE)
certificate that indicates id-ecPublicKey in SubjectPublicKeyInfo,
then any combination of the following values MAY be present:
digitalSignature;
nonRepudiation; and
keyAgreement.
If the EE certificate keyUsage extension asserts keyAgreement, then
it MAY assert either encipherOnly or decipherOnly.
If the keyUsage extension is present in a certificate that indicates
id-ecDH or id-ecMQV in SubjectPublicKeyInfo, then the following MUST
be present:
keyAgreement;
one of the following MAY be present:
encipherOnly; or
decipherOnly.
If the keyUsage extension is present in a certificate that indicates
id-ecDH or id-ecMQV in SubjectPublicKeyInfo, then the following
values MUST NOT be present:
digitalSignature;
nonRepudiation;
keyTransport;
keyCertSign; and
cRLSign.
4. Security Considerations
The security considerations in [PKI-ALG] apply.
When implementing ECC in X.509 Certificates and Certificate
Revocation Lists (CRLs), there are three algorithm-related choices
that need to be made for the signatureAlgorithm field in a
Certificate or CertificateList:
Turner, et al. Standards Track PAGE 8
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
1) What is the public key size?
2) What is the hash algorithm [FIPS180-3]?
3) What is the curve?
Consideration must be given by the CA to the strength of the security
provided by each of these choices. Security is measured in bits,
where a strong symmetric cipher with a key of X bits is said to
provide X bits of security. It is recommended that the bits of
security provided by each choice are roughly equivalent. The
following table provides comparable minimum bits of security
[SP800-57] for the ECDSA key sizes and message digest algorithms. It
also lists curves (see Section 2.1.1.1) for the key sizes.
Minimum | ECDSA | Message | Curves
Bits of | Key Size | Digest |
Security | | Algorithms |
---------+----------+------------+-----------
80 | 160-223 | SHA-1 | sect163k1
| | SHA-224 | secp163r2
| | SHA-256 | secp192r1
| | SHA-384 |
| | SHA-512 |
---------+----------+------------+-----------
112 | 224-255 | SHA-224 | secp224r1
| | SHA-256 | sect233k1
| | SHA-384 | sect233r1
| | SHA-512 |
---------+----------+------------+-----------
128 | 256-383 | SHA-256 | secp256r1
| | SHA-384 | sect283k1
| | SHA-512 | sect283r1
---------+----------+------------+-----------
192 | 384-511 | SHA-384 | secp384r1
| | SHA-512 | sect409k1
| | | sect409r1
---------+----------+------------+-----------
256 | 512+ | SHA-512 | secp521r1
| | | sect571k1
| | | sect571r1
---------+----------+------------+-----------
Turner, et al. Standards Track PAGE 9
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
To promote interoperability, the following choices are RECOMMENDED:
Minimum | ECDSA | Message | Curves
Bits of | Key Size | Digest |
Security | | Algorithms |
---------+----------+------------+-----------
80 | 192 | SHA-256 | secp192r1
---------+----------+------------+-----------
112 | 224 | SHA-256 | secp224r1
---------+----------+------------+-----------
128 | 256 | SHA-256 | secp256r1
---------+----------+------------+-----------
192 | 384 | SHA-384 | secp384r1
---------+----------+------------+-----------
256 | 512 | SHA-512 | secp521r1
---------+----------+------------+-----------
Using a larger hash value and then truncating it consumes more
processing power than is necessary. This is more important on
constrained devices. Since the signer does not know the environment
that the recipient will use to validate the signature, it is better
to use a hash function that provides the desired hash value output
size, and no more.
There are security risks with using keys not associated with well-
known and widely reviewed curves. For example, the curve may not
satisfy the Menezes-Okamoto-Vanstone (MOV) condition [X9.62] or the
curve may be vulnerable to the Anomalous attack [X9.62].
Additionally, either a) all of the arithmetic properties of a
candidate ECC public key must be validated to ensure that it has the
unique correct representation in the correct (additive) subgroup (and
therefore is also in the correct EC group) specified by the
associated ECC domain parameters, or b) some of the arithmetic
properties of a candidate ECC public key must be validated to ensure
that it is in the correct group (but not necessarily the correct
subgroup) specified by the associated ECC domain parameters
[SP800-56A].
As noted in [PKI-ALG], the use of MD2 and MD5 for new applications is
discouraged. It is still reasonable to use MD2 and MD5 to verify
existing signatures.
5. ASN.1 Considerations
[X9.62] defines additional options for ECParameters and ECDSA-Sig-
Value [PKI-ALG]. If an implementation needs to use these options,
then use the [X9.62] ASN.1 module. This RFC contains a conformant
subset of the ASN.1 module defined in [X9.62].
Turner, et al. Standards Track PAGE 10
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
If an implementation generates a PER [X.691] encoding using the ASN.1
module found in this specification, it might not achieve the same
encoded output as one that uses the [X9.62] module. PER is not
required by either the PKIX or S/MIME environments. If an
implementation environment requires PER, then implementation concerns
are less likely with the use of the [X9.62] module.
6. IANA Considerations
This document makes extensive use of object identifiers to register
public key types, elliptic curves, and algorithms. Most are
registered in the ANSI X9.62 arc, with the exception of the hash
algorithms (which are in the NIST arc) and many of the curves (which
are in the Certicom Inc. arc; these curves have been adopted by ANSI
and NIST). Additionally, an object identifier is used to identify
the ASN.1 module found in Appendix A. It is defined in an arc
delegated by IANA to the PKIX Working Group. No further action by
IANA is necessary for this document or any anticipated updates.
7. Acknowledgments
The authors wish to thank Stephen Farrell, Alfred Hoenes, Johannes
Merkle, Jim Schaad, and Carl Wallace for their valued input.
8. References
8.1. Normative References
[FIPS180-3] National Institute of Standards and Technology (NIST),
FIPS Publication 180-3: Secure Hash Standard, October
2008.
[FIPS186-3] National Institute of Standards and Technology (NIST),
FIPS Publication 186-3: Digital Signature Standard,
(draft) November 2008.
[MUSTSHOULD] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[PKI] 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.
[PKI-ALG] 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.
Turner, et al. Standards Track PAGE 11
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
[RSAOAEP] Schaad, J., Kaliski, B., and R. Housley, "Additional
Algorithms and Identifiers for RSA Cryptography for use
in the Internet X.509 Public Key Infrastructure
Certificate and Certificate Revocation List (CRL)
Profile", RFC 4055, June 2005.
[SEC1] Standards for Efficient Cryptography Group (SECG), "SEC
1: Elliptic Curve Cryptography", Version 1.0, September
2000.
[X9.62] American National Standards Institute (ANSI), ANS
X9.62-2005: The Elliptic Curve Digital Signature
Algorithm (ECDSA), 2005.
[X.680] ITU-T Recommendation X.680 (2002) | ISO/IEC 8824-1:2002.
Information Technology - Abstract Syntax Notation One.
8.2. Informative References
[PKI-ADALG] Dang, Q., Santesson, S., Moriarty, K., Brown, D., and T.
Polk, "Internet X.509 Public Key Infrastructure:
Additional Algorithms and Identifiers for DSA and
ECDSA", Work in Progress, October 2008.
[SP800-56A] National Institute of Standards and Technology (NIST),
Special Publication 800-56A: Recommendation for Pair-
Wise Key Establishment Schemes Using Discrete Logarithm
Cryptography (Revised), March 2007.
[SP800-57] National Institute of Standards and Technology (NIST),
Special Publication 800-57: Recommendation for Key
Management - Part 1 (Revised), March 2007.
[X.691] ITU-T Recommendation X.691 (2002) | ISO/IEC 8825-2:2002.
Information Technology - ASN.1 Encoding Rules:
Specification of Packed Encoding Rules.
Turner, et al. Standards Track PAGE 12
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
Appendix A. ASN.1 Module
PKIX1Algorithms2008 { iso(1) identified-organization(3) dod(6)
internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) 45 }
DEFINITIONS EXPLICIT TAGS ::=
BEGIN
-- EXPORTS ALL;
IMPORTS
-- From RFC 4055 [RSAOAEP]
id-sha224, id-sha256, id-sha384, id-sha512
FROM PKIX1-PSS-OAEP-Algorithms
{ iso(1) identified-organization(3) dod(6) internet(1)
security(5) mechanisms(5) pkix(7) id-mod(0)
id-mod-pkix1-rsa-pkalgs(33) }
;
--
-- Message Digest Algorithms
--
-- MD-2
-- Parameters are NULL
id-md2 OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) rsadsi(113549) digestAlgorithm(2) 2 }
-- MD-5
-- Parameters are NULL
id-md5 OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) rsadsi(113549)digestAlgorithm(2) 5 }
-- SHA-1
-- Parameters are preferred absent
id-sha1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) oiw(14) secsig(3)
algorithm(2) 26 }
-- SHA-224
-- Parameters are preferred absent
Turner, et al. Standards Track PAGE 13
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
-- id-sha224 OBJECT IDENTIFIER ::= {
-- joint-iso-itu-t(2) country(16) us(840) organization(1) gov(101)
-- csor(3) nistalgorithm(4) hashalgs(2) 4 }
-- SHA-256
-- Parameters are preferred absent
-- id-sha256 OBJECT IDENTIFIER ::= {
-- joint-iso-itu-t(2) country(16) us(840) organization(1) gov(101)
-- csor(3) nistalgorithm(4) hashalgs(2) 1 }
-- SHA-384
-- Parameters are preferred absent
-- id-sha384 OBJECT IDENTIFIER ::= {
-- joint-iso-itu-t(2) country(16) us(840) organization(1) gov(101)
-- csor(3) nistalgorithm(4) hashalgs(2) 2 }
-- SHA-512
-- Parameters are preferred absent
-- id-sha512 OBJECT IDENTIFIER ::= {
-- joint-iso-itu-t(2) country(16) us(840) organization(1) gov(101)
-- csor(3) nistalgorithm(4) hashalgs(2) 3 }
--
-- Public Key (PK) Algorithms
--
-- RSA PK Algorithm and Key
rsaEncryption OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-1(1) 1 }
RSAPublicKey ::= SEQUENCE {
modulus INTEGER, -- n
publicExponent INTEGER -- e
}
-- DSA PK Algorithm, Key, and Parameters
id-dsa OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) x9-57(10040) x9algorithm(4) 1 }
DSAPublicKey ::= INTEGER -- public key, y
Turner, et al. Standards Track PAGE 14
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
DSS-Parms ::= SEQUENCE {
p INTEGER,
q INTEGER,
g INTEGER
}
-- Diffie-Hellman PK Algorithm, Key, and Parameters
dhpublicnumber OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) ansi-x942(10046) number-type(2) 1 }
DHPublicKey ::= INTEGER -- public key, y = g^x mod p
DomainParameters ::= SEQUENCE {
p INTEGER, -- odd prime, p=jq +1
g INTEGER, -- generator, g
q INTEGER, -- factor of p-1
j INTEGER OPTIONAL, -- subgroup factor, j>= 2
validationParms ValidationParms OPTIONAL
}
ValidationParms ::= SEQUENCE {
seed BIT STRING,
pgenCounter INTEGER
}
-- KEA PK Algorithm and Parameters
id-keyExchangeAlgorithm OBJECT IDENTIFIER ::= {
joint-iso-itu-t(2) country(16) us(840) organization(1) gov(101)
dod(2) infosec(1) algorithms(1) 22 }
KEA-Parms-Id ::= OCTET STRING
-- Sec 2.1.1 Unrestricted Algorithm ID, Key, and Parameters
-- (ECDSA keys use id-ecPublicKey)
id-ecPublicKey OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) ansi-X9-62(10045) keyType(2) 1 }
ECPoint ::= OCTET STRING
-- Parameters for both Restricted and Unrestricted
ECParameters ::= CHOICE {
namedCurve OBJECT IDENTIFIER
-- implicitCurve NULL
Turner, et al. Standards Track PAGE 15
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
-- specifiedCurve SpecifiedECDomain
}
-- implicitCurve and specifiedCurve MUST NOT be used in PKIX.
-- Details for SpecifiedECDomain can be found in [X9.62].
-- Any future additions to this CHOICE should be coordinated
-- with ANSI X9.
-- Sec 2.1.2 Restricted Algorithm IDs, Key, and Parameters: ECDH
id-ecDH OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) schemes(1)
ecdh(12) }
-- ECPoint ::= OCTET STRING
-- Parameters are ECParameters.
-- Sec 2.1.2 Restricted Algorithm IDs, Key, and Parameters: ECMQV
id-ecMQV OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) schemes(1)
ecmqv(13) }
-- ECPoint ::= OCTET STRING
-- Parameters are ECParameters.
--
-- Signature Algorithms
--
-- RSA with MD-2
-- Parameters are NULL
md2WithRSAEncryption OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-1(1) 2 }
-- RSA with MD-5
-- Parameters are NULL
md5WithRSAEncryption OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-1(1) 4 }
-- RSA with SHA-1
-- Parameters are NULL
sha1WithRSAEncryption OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-1(1) 5 }
Turner, et al. Standards Track PAGE 16
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
-- DSA with SHA-1
-- Parameters are ABSENT
id-dsa-with-sha1 OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) x9-57(10040) x9algorithm(4) 3 }
-- DSA with SHA-224
-- Parameters are ABSENT
id-dsa-with-sha224 OBJECT IDENTIFIER ::= {
joint-iso-ccitt(2) country(16) us(840) organization(1) gov(101)
csor(3) algorithms(4) id-dsa-with-sha2(3) 1 }
-- DSA with SHA-256
-- Parameters are ABSENT
id-dsa-with-sha256 OBJECT IDENTIFIER ::= {
joint-iso-ccitt(2) country(16) us(840) organization(1) gov(101)
csor(3) algorithms(4) id-dsa-with-sha2(3) 2 }
-- ECDSA with SHA-1
-- Parameters are ABSENT
ecdsa-with-SHA1 OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) ansi-X9-62(10045) signatures(4) 1 }
-- ECDSA with SHA-224
-- Parameters are ABSENT
ecdsa-with-SHA224 OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) ansi-X9-62(10045) signatures(4)
ecdsa-with-SHA2(3) 1 }
-- ECDSA with SHA-256
-- Parameters are ABSENT
ecdsa-with-SHA256 OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) ansi-X9-62(10045) signatures(4)
ecdsa-with-SHA2(3) 2 }
-- ECDSA with SHA-384
-- Parameters are ABSENT
ecdsa-with-SHA384 OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) ansi-X9-62(10045) signatures(4)
ecdsa-with-SHA2(3) 3 }
Turner, et al. Standards Track PAGE 17
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
-- ECDSA with SHA-512
-- Parameters are ABSENT
ecdsa-with-SHA512 OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) ansi-X9-62(10045) signatures(4)
ecdsa-with-SHA2(3) 4 }
--
-- Signature Values
--
-- DSA
DSA-Sig-Value ::= SEQUENCE {
r INTEGER,
s INTEGER
}
-- ECDSA
ECDSA-Sig-Value ::= SEQUENCE {
r INTEGER,
s INTEGER
}
--
-- Named Elliptic Curves
--
-- Note that in [X9.62] the curves are referred to as 'ansiX9' as
-- opposed to 'sec'. For example secp192r1 is the same curve as
-- ansix9p192r1.
-- Note that in [PKI-ALG] the secp192r1 curve was referred to as
-- prime192v1 and the secp256r1 curve was referred to as prime256v1.
-- Note that [FIPS186-3] refers to secp192r1 as P-192, secp224r1 as
-- P-224, secp256r1 as P-256, secp384r1 as P-384, and secp521r1 as
-- P-521.
secp192r1 OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) ansi-X9-62(10045) curves(3)
prime(1) 1 }
sect163k1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 1 }
Turner, et al. Standards Track PAGE 18
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
sect163r2 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 15 }
secp224r1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 33 }
sect233k1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 26 }
sect233r1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 27 }
secp256r1 OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) ansi-X9-62(10045) curves(3)
prime(1) 7 }
sect283k1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 16 }
sect283r1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 17 }
secp384r1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 34 }
sect409k1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 36 }
sect409r1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 37 }
secp521r1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 35 }
sect571k1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 38 }
sect571r1 OBJECT IDENTIFIER ::= {
iso(1) identified-organization(3) certicom(132) curve(0) 39 }
END
Turner, et al. Standards Track PAGE 19
RFC 5480 ECC SubjectPublicKeyInfo Format March 2009
Authors' Addresses
Sean Turner
IECA, Inc.
3057 Nutley Street, Suite 106
Fairfax, VA 22031
USA
EMail: turners@ieca.com
Kelvin Yiu
Microsoft
One Microsoft Way
Redmond, WA 98052-6399
USA
EMail: kelviny@microsoft.com
Daniel R. L. Brown
Certicom Corp
5520 Explorer Drive #400
Mississauga, ON L4W 5L1
CANADA
EMail: dbrown@certicom.com
Russ Housley
Vigil Security, LLC
918 Spring Knoll Drive
Herndon, VA 20170
USA
EMail: housley@vigilsec.com
Tim Polk
NIST
Building 820, Room 426
Gaithersburg, MD 20899
EMail: wpolk@nist.gov
Turner, et al. Standards Track PAGE 20
Elliptic Curve Cryptography Subject Public Key Information
RFC TOTAL SIZE: 36209 bytes
PUBLICATION DATE: Monday, March 9th, 2009
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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