abstract public  void checkValidity() throws CertificateExpiredException, CertificateNotYetValidException
Checks that the certificate is currently valid. It is if
the current date and time are within the validity period given in the
certificate.

The validity period consists of two date/time values:
the first and last dates (and times) on which the certificate
is valid. It is defined in
ASN.1 as:
validity Validity

Validity ::= SEQUENCE {
notBefore CertificateValidityDate,
notAfter CertificateValidityDate }

CertificateValidityDate ::= CHOICE {
utcTime UTCTime,
generalTime GeneralizedTime }

 abstract public  void checkValidity(Date date) throws CertificateExpiredException, CertificateNotYetValidException
Checks that the specified date is within the certificate's
validity period. In other words, this determines whether the
certificate would be valid at the specified date/time.

 public static final X509Certificate getInstance(InputStream inStream) throws CertificateException 
{
     
        X509Provider = AccessController.doPrivileged(
            new PrivilegedAction< String >() {
                public String run() {
                    return Security.getProperty(X509_PROVIDER);
                }
            }
        );
        return getInst((Object)inStream);
}

Instantiates an X509Certificate object, and initializes it with the data read from the input stream inStream. The implementation (X509Certificate is an abstract class) is provided by the class specified as the value of the cert.provider.x509v1 property in the security properties file.

Note: Only one DER-encoded certificate is expected to be in the input stream. Also, all X509Certificate subclasses must provide a constructor of the form:

public <subClass>(InputStream inStream) ...

 public static final X509Certificate getInstance(byte[] certData) throws CertificateException 
{
        return getInst((Object)certData);
}

Instantiates an X509Certificate object, and initializes it with the specified byte array. The implementation (X509Certificate is an abstract class) is provided by the class specified as the value of the cert.provider.x509v1 property in the security properties file.

Note: All X509Certificate subclasses must provide a constructor of the form:

public <subClass>(InputStream inStream) ...

 abstract public Principal getIssuerDN()
Gets the issuer (issuer distinguished name) value from
the certificate. The issuer name identifies the entity that signed (and
issued) the certificate.

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.

 abstract public Date getNotAfter()
Gets the notAfter date from the validity period of
the certificate. See getNotBefore 
for relevant ASN.1 definitions.

 abstract public Date getNotBefore()
Gets the notBefore date from the validity period of
the certificate.
The relevant ASN.1 definitions are:
validity Validity


Validity ::= SEQUENCE {
notBefore CertificateValidityDate,
notAfter CertificateValidityDate }

CertificateValidityDate ::= CHOICE {
utcTime UTCTime,
generalTime GeneralizedTime }

 abstract public BigInteger getSerialNumber()
Gets the serialNumber value from the certificate.
The serial number is an integer assigned by the certification
authority to each certificate. It must be unique for each
certificate issued by a given CA (i.e., the issuer name and
serial number identify a unique certificate).
The ASN.1 definition for this is:
serialNumber CertificateSerialNumber


CertificateSerialNumber ::= INTEGER

 abstract public String getSigAlgName()
Gets the signature algorithm name for the certificate
signature algorithm. An example is the string "SHA-1/DSA".
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.

 abstract public String getSigAlgOID()
Gets the signature algorithm OID string from the certificate.
An OID is represented by a set of positive whole numbers separated
by periods.
For example, the string "1.2.840.10040.4.3" identifies the SHA-1
with DSA signature algorithm, as per the PKIX part I.

See getSigAlgName  for
relevant ASN.1 definitions.

 abstract public byte[] getSigAlgParams()
Gets the DER-encoded signature algorithm parameters from this
certificate's signature algorithm. In most cases, the signature
algorithm parameters are null; the parameters are usually
supplied with the certificate's public key.

See getSigAlgName  for
relevant ASN.1 definitions.

 abstract public Principal getSubjectDN()
Gets the subject (subject distinguished name) value
from the certificate.
The ASN.1 definition for this is:
subject Name


See getIssuerDN  for Name
and other relevant definitions.

 abstract public int getVersion()
Gets the version (version number) value from the
certificate. The ASN.1 definition for this is:
version [0] EXPLICIT Version DEFAULT v1

Version ::= INTEGER { v1(0), v2(1), v3(2) }