Java Doc for X509CRL.java in  » 6.0-JDK-Modules » j2me » java » security » cert » Java Source Code / Java DocumentationJava Source Code and Java Documentation

Abstract class for an X.509 Certificate Revocation List (CRL). A CRL is a time-stamped list identifying revoked certificates. It is signed by a Certificate Authority (CA) and made freely available in a public repository.

Each revoked certificate is identified in a CRL by its certificate serial number. When a certificate-using system uses a certificate (e.g., for verifying a remote user's digital signature), that system not only checks the certificate signature and validity but also acquires a suitably- recent CRL and checks that the certificate serial number is not on that CRL. The meaning of "suitably-recent" may vary with local policy, but it usually means the most recently-issued CRL. A CA issues a new CRL on a regular periodic basis (e.g., hourly, daily, or weekly). Entries are added to CRLs as revocations occur, and an entry may be removed when the certificate expiration date is reached.

The X.509 v2 CRL format is described below in ASN.1:

 CertificateList  ::=  SEQUENCE  {
 tbsCertList          TBSCertList,
 signatureAlgorithm   AlgorithmIdentifier,
 signature            BIT STRING  }
 

More information can be found in RFC 2459, "Internet X.509 Public Key Infrastructure Certificate and CRL Profile" at http://www.ietf.org/rfc/rfc2459.txt .

The ASN.1 definition of tbsCertList is:

 TBSCertList  ::=  SEQUENCE  {
 version                 Version OPTIONAL,
 -- if present, must be v2
 signature               AlgorithmIdentifier,
 issuer                  Name,
 thisUpdate              ChoiceOfTime,
 nextUpdate              ChoiceOfTime OPTIONAL,
 revokedCertificates     SEQUENCE OF SEQUENCE  {
 userCertificate         CertificateSerialNumber,
 revocationDate          ChoiceOfTime,
 crlEntryExtensions      Extensions OPTIONAL
 -- if present, must be v2
 }  OPTIONAL,
 crlExtensions           [0]  EXPLICIT Extensions OPTIONAL
 -- if present, must be v2
 }
 

CRLs are instantiated using a certificate factory. The following is an example of how to instantiate an X.509 CRL:

 
 InputStream inStream = new FileInputStream("fileName-of-crl");
 CertificateFactory cf = CertificateFactory.getInstance("X.509");
 X509CRL crl = (X509CRL)cf.generateCRL(inStream);
 inStream.close();
 

 version    Version OPTIONAL,
 -- if present, must be v2

 Version  ::=  INTEGER  {  v1(0), v2(1), v3(2)  }
 -- v3 does not apply to CRLs but appears for consistency
 -- with definition of Version for certs
 

The issuer name field contains an X.500 distinguished name (DN). The ASN.1 definition for this is:

 issuer    Name
 Name ::= CHOICE { RDNSequence }
 RDNSequence ::= SEQUENCE OF RelativeDistinguishedName
 RelativeDistinguishedName ::=
 SET OF AttributeValueAssertion
 AttributeValueAssertion ::= SEQUENCE {
 AttributeType,
 AttributeValue }
 AttributeType ::= OBJECT IDENTIFIER
 AttributeValue ::= ANY
 

It is recommended that subclasses override this method to provide an efficient implementation. an X500Principal representing the issuerdistinguished name
since:
   1.4

 signatureAlgorithm   AlgorithmIdentifier

 AlgorithmIdentifier  ::=  SEQUENCE  {
 algorithm               OBJECT IDENTIFIER,
 parameters              ANY DEFINED BY algorithm OPTIONAL  }
 -- contains a value of the type
 -- registered for use with the
 -- algorithm object identifier value
 

The algorithm name is determined from the algorithm OID string. the signature algorithm name.

See getSigAlgName()#getSigAlgName for relevant ASN.1 definitions. the signature algorithm OID string.

See getSigAlgName()#getSigAlgName for relevant ASN.1 definitions. the DER-encoded signature algorithm parameters, ornull if no parameters are present.

 signature     BIT STRING  
 

 thisUpdate   ChoiceOfTime
 ChoiceOfTime ::= CHOICE {
 utcTime        UTCTime,
 generalTime    GeneralizedTime }
 

 version    Version OPTIONAL,
 -- if present, must be v2

 Version  ::=  INTEGER  {  v1(0), v2(1), v3(2)  }
 -- v3 does not apply to CRLs but appears for consistency
 -- with definition of Version for certs