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Certificate Attributes

July 1998

In JDK1.2 we provide an implementation of X.509 (version 3). The X509CertImpl class supports the following methods to manipulate the various attributes of a certificate:

         Object get(String name)
         void set(String name, Object value), and
         void delete(String name)

A list of all the X.509 v3 Certificate attributes that can be manipulated is provided in the following table. For example, if you want to get the signature component of the certificate:

         X509CertImpl cert;
         // get the certificate object
         byte[] sig = (byte[])cert.get("x509.signature");
                      // using the fully-qualified identifier
    OR
         byte[] sig = (byte[])cert.get(X509CertImpl.SIG);
                      // using defined constants

sun.security.x509.X509CertImpl
Attribute | Fully-qualified identifier | Defined constants | Type of Object returned (in sun.security.x509 unless fully-qualified)
signatureAlgorithm | x509.algorithm | X509CertImpl.SIG_ALG | AlgorithmId
signature | x509.signature | X509CertImpl.SIG | byte[]
tbsCertificate | x509.info | X509CertInfo.IDENT | X509CertInfo
version | x509.info.version x509.info.version.number | CertificateVersion.IDENT none | CertificateVersion java.lang.Integer
serialNumber | x509.info.serialNumber x509.info.serialNumber.number | CertificateSerialNumber.IDENT X509CertImpl.SERIAL_ID | CertificateSerialNumber SerialNumber
signature | x509.info.algorithmID x509.info.algorithmID.algorithm | CertificateAlgorithmId.IDENT none | CertificateAlgorithmId AlgorithmId
issuer | x509.info.issuer x509.info.issuer.dname | none X509CertImpl.ISSUER_DN | X500Name X500Name
validity validity.notAfter validity.notBefore | x509.info.validity x509.info.validity.notAfter x509.info.validity.notBefore | CertificateValidity.IDENT none none | CertificateValidity java.util.Date java.util.Date
subject | x509.info.subject x509.info.subject.dname | none X509CertImpl.SUBJECT_DN | X500Name X500Name
subjectPublicKeyInfo | x509.info.key x509.info.key.value | CertificateX509Key.IDENT X509CertImpl.PUBLIC_KEY | CertificateX509Key X509Key
issuerUniqueID | x509.info.issuerID x509.info.issuerID.id | none none | UniqueIdentity UniqueIdentity
subjectUniqueID | x509.info.subjectID x509.info.subjectID.id | none none | UniqueIdentity UniqueIdentity
extensions | x509.info.extensions | CertificateExtensions.IDENT | CertificateExtensions

X.509 V3 certificate extensions
Extension | Extension attribute identifier | Short form | Type of Object returned
Authority Key Identifier | x509.info.extensions.AuthorityKeyIdentifier | AuthorityKeyIdentifierExtension.IDENT | AuthorityKeyIdentifierExtension
Subject Key Identifier | x509.info.extensions.SubjectKeyIdentifier | SubjectKeyIdentifierExtension.IDENT | SubjectKeyIdentifierExtension
Key Usage | x509.info.extensions.KeyUsage | KeyUsageExtension.IDENT | KeyUsageExtension
Private Key Usage Period | x509.info.extensions.PrivateKeyUsage | PrivateKeyUsageExtension.IDENT | PrivateKeyUsageExtension
Policy Mappings | x509.info.extensions.PolicyMappings | PolicyMappingsExtension.IDENT | PolicyMappingsExtension
Subject Alternative Name | x509.info.extensions.SubjectAlternativeName | SubjectAlternativeNameExtension.IDENT | SubjectAlternativeNameExtension
Issuer Alternative Name | x509.info.extensions.IssuerAlternativeName | IssuerAlternativeNameExtension.IDENT | IssuerAlternativeNameExtension
Basic Constraints | x509.info.extensions.BasicConstraints | BasicConstraintsExtension.IDENT | BasicConstraintsExtension
Name Constraints | x509.info.extensions.NameConstraints | NameConstraintsExtension.IDENT | NameConstraintsExtension
Policy Constraints | x509.info.extensions.PolicyConstraints | PolicyConstraintsExtension.IDENT | PolicyConstraintsExtension
Netscape Certificate Type | x509.info.extensions.NetscapeCertType | NetscapeCertTypeExtension.IDENT | NetscapeCertTypeExtension

Extensions can be added by implementing the `sun.security.x509.CertAttrSet` interface and subclassing `sun.security.x509.Extension` class. Register the new extension using the OIDMap class. The following extensions are not currently supported from the PKIX profile:

Name | ObjectIdentifier
CertificatePolicies | 2.5.29.32