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Java™ Platform Standard Ed. 6 |
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java.lang.Object java.security.cert.CRL java.security.cert.X509CRL
public abstract class X509CRL
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();
CRL
,
CertificateFactory
,
X509Extension
Constructor Summary | |
---|---|
protected |
X509CRL()
Constructor for X.509 CRLs. |
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 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. |
abstract X509CRLEntry |
getRevokedCertificate(BigInteger serialNumber)
Gets the CRL entry, if any, with the given certificate serialNumber. |
X509CRLEntry |
getRevokedCertificate(X509Certificate certificate)
Get the CRL entry, if any, for the given certificate. |
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. |
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. |
Methods inherited from class java.security.cert.CRL |
---|
getType, isRevoked, toString |
Methods inherited from class java.lang.Object |
---|
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.security.cert.X509Extension |
---|
getCriticalExtensionOIDs, getExtensionValue, getNonCriticalExtensionOIDs, hasUnsupportedCriticalExtension |
Constructor Detail |
---|
protected X509CRL()
Method Detail |
---|
public boolean equals(Object other)
other
object is an
instanceof
X509CRL
, then
its encoded form is retrieved and compared with the
encoded form of this CRL.
equals
in class Object
other
- the object to test for equality with this CRL.
Object.hashCode()
,
Hashtable
public int hashCode()
hashCode
in class Object
Object.equals(java.lang.Object)
,
Hashtable
public abstract byte[] getEncoded() throws CRLException
CRLException
- if an encoding error occurs.public abstract void verify(PublicKey key) throws CRLException, NoSuchAlgorithmException, InvalidKeyException, NoSuchProviderException, SignatureException
key
- the PublicKey used to carry out the verification.
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) throws CRLException, NoSuchAlgorithmException, InvalidKeyException, NoSuchProviderException, SignatureException
key
- the PublicKey used to carry out the verification.sigProvider
- the name of the signature provider.
NoSuchAlgorithmException
- on unsupported signature
algorithms.
InvalidKeyException
- on incorrect key.
NoSuchProviderException
- on incorrect provider.
SignatureException
- on signature errors.
CRLException
- on encoding errors.public abstract int getVersion()
version
(version number) value from the CRL.
The ASN.1 definition for this is:
version Version OPTIONAL, -- if present, must be v2Version ::= INTEGER { v1(0), v2(1), v3(2) } -- v3 does not apply to CRLs but appears for consistency -- with definition of Version for certs
public abstract Principal getIssuerDN()
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 ::= ANYThe
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
.
public X500Principal getIssuerX500Principal()
X500Principal
.
It is recommended that subclasses override this method.
X500Principal
representing the issuer
distinguished namepublic abstract Date getThisUpdate()
thisUpdate
date from the CRL.
The ASN.1 definition for this is:
thisUpdate ChoiceOfTime ChoiceOfTime ::= CHOICE { utcTime UTCTime, generalTime GeneralizedTime }
thisUpdate
date from the CRL.public abstract Date getNextUpdate()
nextUpdate
date from the CRL.
nextUpdate
date from the CRL, or null if
not present.public abstract X509CRLEntry getRevokedCertificate(BigInteger serialNumber)
serialNumber
- the serial number of the certificate for which a CRL entry
is to be looked up
X509CRLEntry
public X509CRLEntry getRevokedCertificate(X509Certificate 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.
certificate
- the certificate for which a CRL entry is to be looked
up
NullPointerException
- if certificate is nullpublic abstract Set<? extends X509CRLEntry> getRevokedCertificates()
X509CRLEntry
public abstract byte[] getTBSCertList() throws CRLException
tbsCertList
from this CRL.
This can be used to verify the signature independently.
CRLException
- if an encoding error occurs.public abstract byte[] getSignature()
signature
value (the raw signature bits) from
the CRL.
The ASN.1 definition for this is:
signature BIT STRING
public abstract String getSigAlgName()
signatureAlgorithm AlgorithmIdentifierAlgorithmIdentifier ::= 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.
public abstract String getSigAlgOID()
See getSigAlgName
for
relevant ASN.1 definitions.
public abstract byte[] getSigAlgParams()
AlgorithmParameters
and instantiate with the name returned by
getSigAlgName
.
See getSigAlgName
for
relevant ASN.1 definitions.
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Java™ Platform Standard Ed. 6 |
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