X509CRL

public abstract class X509CRL extends CRL
implements X509Extension

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 3280: Internet X.509 Public Key Infrastructure Certificate and CRL Profile.

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:

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

See Also

• CRL
• CertificateFactory
• X509Extension

Protected Constructor Summary

X509CRL() Constructor for X.509 CRLs.

Public Method Summary

boolean	equals(Object other) Compares this CRL for equality with the given object.
abstract byte[]	getEncoded() Returns the ASN.1 DER-encoded form of this CRL.
abstract Principal	getIssuerDN() Denigrated, replaced by {@linkplain #getIssuerX500Principal()}.
X500Principal	getIssuerX500Principal() Returns the issuer (issuer distinguished name) value from the CRL as an X500Principal.
abstract Date	getNextUpdate() Gets the nextUpdate date from the CRL.
X509CRLEntry	getRevokedCertificate(X509Certificate certificate) Get the CRL entry, if any, for the given certificate.
abstract X509CRLEntry	getRevokedCertificate(BigInteger serialNumber) Gets the CRL entry, if any, with the given certificate serialNumber.
abstract Set<? extends X509CRLEntry>	getRevokedCertificates() Gets all the entries from this CRL.
abstract String	getSigAlgName() Gets the signature algorithm name for the CRL signature algorithm.
abstract String	getSigAlgOID() Gets the signature algorithm OID string from the CRL.
abstract byte[]	getSigAlgParams() Gets the DER-encoded signature algorithm parameters from this CRL's signature algorithm.
abstract byte[]	getSignature() Gets the signature value (the raw signature bits) from the CRL.
abstract byte[]	getTBSCertList() Gets the DER-encoded CRL information, the tbsCertList from this CRL.
abstract Date	getThisUpdate() Gets the thisUpdate date from the CRL.
abstract int	getVersion() Gets the version (version number) value from the CRL.
int	hashCode() Returns a hashcode value for this CRL from its encoded form.
void	verify(PublicKey key, Provider sigProvider) Verifies that this CRL was signed using the private key that corresponds to the given public key.
abstract void	verify(PublicKey key) Verifies that this CRL was signed using the private key that corresponds to the given public key.
abstract void	verify(PublicKey key, String sigProvider) Verifies that this CRL was signed using the private key that corresponds to the given public key.

Inherited Method Summary

From class java.security.cert.CRL

final String	getType() Returns the type of this CRL.
abstract boolean	isRevoked(Certificate cert) Checks whether the given certificate is on this CRL.
abstract String	toString() Returns a string representation of this CRL.

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

From interface java.security.cert.X509Extension

abstract Set<String>	getCriticalExtensionOIDs() Gets a Set of the OID strings for the extension(s) marked CRITICAL in the certificate/CRL managed by the object implementing this interface.
abstract byte[]	getExtensionValue(String oid) Gets the DER-encoded OCTET string for the extension value (extnValue) identified by the passed-in oid String.
abstract Set<String>	getNonCriticalExtensionOIDs() Gets a Set of the OID strings for the extension(s) marked NON-CRITICAL in the certificate/CRL managed by the object implementing this interface.
abstract boolean	hasUnsupportedCriticalExtension() Check if there is a critical extension that is not supported.

Protected Constructors

protected X509CRL ()

Constructor for X.509 CRLs.

Public Methods

public boolean equals (Object other)

Compares this CRL for equality with the given object. If the other object is an instanceof X509CRL, then its encoded form is retrieved and compared with the encoded form of this CRL.

Parameters

other	the object to test for equality with this CRL.

Returns

• true iff the encoded forms of the two CRLs match, false otherwise.

public abstract byte[] getEncoded ()

Returns the ASN.1 DER-encoded form of this CRL.

Returns

• the encoded form of this certificate

Throws

CRLException	if an encoding error occurs.

public abstract Principal getIssuerDN ()

Denigrated, replaced by {@linkplain #getIssuerX500Principal()}. This method returns the issuer as an implementation specific Principal object, which should not be relied upon by portable code.

Gets the issuer (issuer distinguished name) value from the CRL. The issuer name identifies the entity that signed (and issued) the CRL.

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
 

The Name describes a hierarchical name composed of attributes, such as country name, and corresponding values, such as US. The type of the AttributeValue component is determined by the AttributeType; in general it will be a directoryString. A directoryString is usually one of PrintableString, TeletexString or UniversalString.

Returns

• a Principal whose name is the issuer distinguished name.

public X500Principal getIssuerX500Principal ()

Returns the issuer (issuer distinguished name) value from the CRL as an X500Principal.

It is recommended that subclasses override this method.

Returns

• an X500Principal representing the issuer distinguished name

public abstract Date getNextUpdate ()

Gets the nextUpdate date from the CRL.

Returns

• the nextUpdate date from the CRL, or null if not present.

public X509CRLEntry getRevokedCertificate (X509Certificate certificate)

Get the CRL entry, if any, for the given certificate.

This method can be used to lookup CRL entries in indirect CRLs, that means CRLs that contain entries from issuers other than the CRL issuer. The default implementation will only return entries for certificates issued by the CRL issuer. Subclasses that wish to support indirect CRLs should override this method.

Parameters

certificate	the certificate for which a CRL entry is to be looked up

Returns

• the entry for the given certificate, or null if no such entry exists in this CRL.

Throws

NullPointerException	if certificate is null

public abstract X509CRLEntry getRevokedCertificate (BigInteger serialNumber)

Gets the CRL entry, if any, with the given certificate serialNumber.

Parameters

serialNumber	the serial number of the certificate for which a CRL entry is to be looked up

Returns

• the entry with the given serial number, or null if no such entry exists in this CRL.

See Also

• X509CRLEntry

public abstract Set<? extends X509CRLEntry> getRevokedCertificates ()

Gets all the entries from this CRL. This returns a Set of X509CRLEntry objects.

Returns

• all the entries or null if there are none present.

See Also

• X509CRLEntry

public abstract String getSigAlgName ()

Gets the signature algorithm name for the CRL signature algorithm. An example is the string "SHA256withRSA". The ASN.1 definition for this is:

 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.

Returns

• the signature algorithm name.

public abstract String getSigAlgOID ()

Gets the signature algorithm OID string from the CRL. An OID is represented by a set of nonnegative whole numbers separated by periods. For example, the string "1.2.840.10040.4.3" identifies the SHA-1 with DSA signature algorithm defined in RFC 3279: Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and CRL Profile.

See getSigAlgName for relevant ASN.1 definitions.

Returns

• the signature algorithm OID string.

public abstract byte[] getSigAlgParams ()

Gets the DER-encoded signature algorithm parameters from this CRL's signature algorithm. In most cases, the signature algorithm parameters are null; the parameters are usually supplied with the public key. If access to individual parameter values is needed then use AlgorithmParameters and instantiate with the name returned by getSigAlgName.

See getSigAlgName for relevant ASN.1 definitions.

Returns

• the DER-encoded signature algorithm parameters, or null if no parameters are present.

public abstract byte[] getSignature ()

Gets the signature value (the raw signature bits) from the CRL. The ASN.1 definition for this is:

 signature     BIT STRING
 

Returns

• the signature.

public abstract byte[] getTBSCertList ()

Gets the DER-encoded CRL information, the tbsCertList from this CRL. This can be used to verify the signature independently.

Returns

• the DER-encoded CRL information.

Throws

CRLException	if an encoding error occurs.

public abstract Date getThisUpdate ()

Gets the thisUpdate date from the CRL. The ASN.1 definition for this is:

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

Returns

• the thisUpdate date from the CRL.

public abstract int getVersion ()

Gets the version (version number) value from the CRL. The ASN.1 definition for this is:

 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
 

Returns

• the version number, i.e. 1 or 2.

public int hashCode ()

Returns a hashcode value for this CRL from its encoded form.

Returns

• the hashcode value.

public void verify (PublicKey key, Provider sigProvider)

Verifies that this CRL was signed using the private key that corresponds to the given public key. This method uses the signature verification engine supplied by the given provider. Note that the specified Provider object does not have to be registered in the provider list. This method was added to version 1.8 of the Java Platform Standard Edition. In order to maintain backwards compatibility with existing service providers, this method is not abstract and it provides a default implementation.

Parameters

key	the PublicKey used to carry out the verification.
sigProvider	the signature provider.

Throws

NoSuchAlgorithmException	on unsupported signature algorithms.
InvalidKeyException	on incorrect key.
SignatureException	on signature errors.
CRLException	on encoding errors.

public abstract void verify (PublicKey key)

Verifies that this CRL was signed using the private key that corresponds to the given public key.

Parameters

key	the PublicKey used to carry out the verification.

Throws

NoSuchAlgorithmException	on unsupported signature algorithms.
InvalidKeyException	on incorrect key.
NoSuchProviderException	if there's no default provider.
SignatureException	on signature errors.
CRLException	on encoding errors.

public abstract void verify (PublicKey key, String sigProvider)

Verifies that this CRL was signed using the private key that corresponds to the given public key. This method uses the signature verification engine supplied by the given provider.

Parameters

key	the PublicKey used to carry out the verification.
sigProvider	the name of the signature provider.

Throws

NoSuchAlgorithmException	on unsupported signature algorithms.
InvalidKeyException	on incorrect key.
NoSuchProviderException	on incorrect provider.
SignatureException	on signature errors.
CRLException	on encoding errors.