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<TITLE>Certificate Attributes</TITLE>
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<h2><center>Certificate Attributes</center></h2>
<font size=3><center>July 1998</font></center>
<p>
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:
<pre>
Object get(String name)
void set(String name, Object value), and
void delete(String name)
</pre>
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:
<pre>
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
</pre>
<p>
<table border=1>
<caption>sun.security.x509.X509CertImpl</caption>
<tr>
<td><strong>Attribute</strong></td>
<td><strong>Fully-qualified identifier</strong></td>
<td><strong>Defined constants</strong></td>
<td><strong>Type of Object returned</strong><br>
(in sun.security.x509 unless fully-qualified)</td>
</tr>
<tr>
<td>signatureAlgorithm</td>
<td>x509.algorithm</td>
<td>X509CertImpl.SIG_ALG</td>
<td>AlgorithmId</td>
</tr>
<tr>
<td>signature</td>
<td>x509.signature</td>
<td>X509CertImpl.SIG</td>
<td>byte[]</td>
</tr>
<tr>
<td>tbsCertificate</td>
<td>x509.info</td>
<td>X509CertInfo.IDENT</td>
<td>X509CertInfo</td>
</tr>
<tr>
<td>version</td>
<td>x509.info.version<br>
x509.info.version.number</td>
<td>CertificateVersion.IDENT<br>
none</td>
<td>CertificateVersion<br>
java.lang.Integer</td>
</tr>
<tr>
<td>serialNumber</td>
<td>x509.info.serialNumber<br>
x509.info.serialNumber.number</td>
<td>CertificateSerialNumber.IDENT<br>
X509CertImpl.SERIAL_ID</td>
<td>CertificateSerialNumber<br>
SerialNumber</td>
</tr>
<tr>
<td>signature</td>
<td>x509.info.algorithmID<br>
x509.info.algorithmID.algorithm</td>
<td>CertificateAlgorithmId.IDENT<br>
none</td>
<td>CertificateAlgorithmId<br>
AlgorithmId</td>
</tr>
<tr>
<td>issuer</td>
<td>x509.info.issuer<br>
x509.info.issuer.dname</td>
<td>none<br>
X509CertImpl.ISSUER_DN</td>
<td>X500Name<br>
X500Name</td>
</tr>
<tr>
<td>validity<br>
validity.notAfter<br>
validity.notBefore</td>
<td>x509.info.validity<br>
x509.info.validity.notAfter<br>
x509.info.validity.notBefore</td>
<td>CertificateValidity.IDENT<br>
none<br>
none</td>
<td>CertificateValidity<br>
java.util.Date<br>
java.util.Date</td>
</tr>
<tr>
<td>subject</td>
<td>x509.info.subject<br>
x509.info.subject.dname</td>
<td>none<br>
X509CertImpl.SUBJECT_DN</td>
<td>X500Name<br>
X500Name</td>
</tr>
<tr>
<td>subjectPublicKeyInfo</td>
<td>x509.info.key<br>
x509.info.key.value</td>
<td>CertificateX509Key.IDENT<br>
X509CertImpl.PUBLIC_KEY</td>
<td>CertificateX509Key<br>
X509Key</td>
</tr>
<tr>
<td>issuerUniqueID</td>
<td>x509.info.issuerID<br>
x509.info.issuerID.id</td>
<td>none<br>
none</td>
<td>UniqueIdentity<br>
UniqueIdentity</td>
</tr>
<tr>
<td>subjectUniqueID</td>
<td>x509.info.subjectID<br>
x509.info.subjectID.id</td>
<td>none<br>
none</td>
<td>UniqueIdentity<br>
UniqueIdentity</td>
</tr>
<tr>
<td>extensions</td>
<td>x509.info.extensions</td>
<td>CertificateExtensions.IDENT</td>
<td>CertificateExtensions</td>
</tr>
</table>
<br>
<br>
<table border=1>
<caption>X.509 V3 certificate extensions</caption>
<tr>
<td><strong>Extension</strong></td>
<td><strong>Extension attribute identifier</strong></td>
<td><strong>Short form</strong></td>
<td><strong>Type of Object returned</strong></td>
</tr>
<tr>
<td>Authority Key Identifier</td>
<td>x509.info.extensions.AuthorityKeyIdentifier</td>
<td>AuthorityKeyIdentifierExtension.IDENT</td>
<td>AuthorityKeyIdentifierExtension</td>
</tr>
<tr>
<td>Subject Key Identifier</td>
<td>x509.info.extensions.SubjectKeyIdentifier</td>
<td>SubjectKeyIdentifierExtension.IDENT</td>
<td>SubjectKeyIdentifierExtension</td>
</tr>
<tr>
<td>Key Usage</td>
<td>x509.info.extensions.KeyUsage</td>
<td>KeyUsageExtension.IDENT</td>
<td>KeyUsageExtension</td>
</tr>
<tr>
<td>Private Key Usage Period</td>
<td>x509.info.extensions.PrivateKeyUsage</td>
<td>PrivateKeyUsageExtension.IDENT</td>
<td>PrivateKeyUsageExtension</td>
</tr>
<tr>
<td>Policy Mappings</td>
<td>x509.info.extensions.PolicyMappings</td>
<td>PolicyMappingsExtension.IDENT</td>
<td>PolicyMappingsExtension</td>
</tr>
<tr>
<td>Subject Alternative Name</td>
<td>x509.info.extensions.SubjectAlternativeName</td>
<td>SubjectAlternativeNameExtension.IDENT</td>
<td>SubjectAlternativeNameExtension</td>
</tr>
<tr>
<td>Issuer Alternative Name</td>
<td>x509.info.extensions.IssuerAlternativeName</td>
<td>IssuerAlternativeNameExtension.IDENT</td>
<td>IssuerAlternativeNameExtension</td>
</tr>
<tr>
<td>Basic Constraints</td>
<td>x509.info.extensions.BasicConstraints</td>
<td>BasicConstraintsExtension.IDENT</td>
<td>BasicConstraintsExtension</td>
</tr>
<tr>
<td>Name Constraints</td>
<td>x509.info.extensions.NameConstraints</td>
<td>NameConstraintsExtension.IDENT</td>
<td>NameConstraintsExtension</td>
</tr>
<tr>
<td>Policy Constraints</td>
<td>x509.info.extensions.PolicyConstraints</td>
<td>PolicyConstraintsExtension.IDENT</td>
<td>PolicyConstraintsExtension</td>
</tr>
<tr>
<td>Netscape Certificate Type</td>
<td>x509.info.extensions.NetscapeCertType</td>
<td>NetscapeCertTypeExtension.IDENT</td>
<td>NetscapeCertTypeExtension</td>
</tr>
</table>
<p>
Extensions can be added by implementing the
<code>sun.security.x509.CertAttrSet</code> interface and
subclassing <code>sun.security.x509.Extension</code> class.
Register the new extension using the OIDMap class.
The following extensions are not currently supported from the
PKIX profile:
<table>
<tr>
<td>Name</td>
<td>ObjectIdentifier</td>
</tr>
<tr>
<td>CertificatePolicies</td>
<td>2.5.29.32</td>
</tr>
</table>
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