etf.org/rfc/rfc2459.txt"> http://www.ietf.org/rfc/rfc2459.txt .

The ASN.1 definition of tbsCertificate is:

 TBSCertificate  ::=  SEQUENCE  { version         [0]  EXPLICIT Version DEFAULT v1, serialNumber         CertificateSerialNumber, signature            AlgorithmIdentifier, issuer               Name, validity             Validity, subject              Name, subjectPublicKeyInfo SubjectPublicKeyInfo, issuerUniqueID  [1]  IMPLICIT UniqueIdentifier OPTIONAL, -- If present, version must be v2 or v3 subjectUniqueID [2]  IMPLICIT UniqueIdentifier OPTIONAL, -- If present, version must be v2 or v3 extensions      [3]  EXPLICIT Extensions OPTIONAL -- If present, version must be v3 } 

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

  InputStream inStream = new FileInputStream("fileName-of-cert"); CertificateFactory cf = CertificateFactory.getInstance("X.509"); X509Certificate cert = (X509Certificate)cf.generateCertificate(inStream); inStream.close(); 

@author Hemma Prafullchandra @version 1.40 @see Certificate @see CertificateFactory @see X509Extension

Abstract class for X.509 v1 certificates. This provides a standard way to access all the version 1 attributes of an X.509 certificate. Attributes that are specific to X.509 v2 or v3 are not available through this interface. Future API evolution will provide full access to complete X.509 v3 attributes.

The basic X.509 format was defined by ISO/IEC and ANSI X9 and is described below in ASN.1:

 Certificate  ::=  SEQUENCE  { tbsCertificate       TBSCertificate, signatureAlgorithm   AlgorithmIdentifier, signature            BIT STRING  } 

These certificates are widely used to support authentication and other functionality in Internet security systems. Common applications include Privacy Enhanced Mail (PEM), Transport Layer Security (SSL), code signing for trusted software distribution, and Secure Electronic Transactions (SET).

These certificates are managed and vouched for by Certificate Authorities (CAs). CAs are services which create certificates by placing data in the X.509 standard format and then digitally signing that data. CAs act as trusted third parties, making introductions between principals who have no direct knowledge of each other. CA certificates are either signed by themselves, or by some other CA such as a "root" CA.

The ASN.1 definition of {@code tbsCertificate} is:

 TBSCertificate  ::=  SEQUENCE  { version         [0]  EXPLICIT Version DEFAULT v1, serialNumber         CertificateSerialNumber, signature            AlgorithmIdentifier, issuer               Name, validity             Validity, subject              Name, subjectPublicKeyInfo SubjectPublicKeyInfo, } 

Here is sample code to instantiate an X.509 certificate:

 InputStream inStream = new FileInputStream("fileName-of-cert"); X509Certificate cert = X509Certificate.getInstance(inStream); inStream.close(); 

OR

 byte[] certData = <certificate read from a file, say> X509Certificate cert = X509Certificate.getInstance(certData); 

In either case, the code that instantiates an X.509 certificate consults the value of the {@code cert.provider.x509v1} security propertyto locate the actual implementation or instantiates a default implementation.

The {@code cert.provider.x509v1} property is set to a defaultimplementation for X.509 such as:

 cert.provider.x509v1=com.sun.security.cert.internal.x509.X509V1CertImpl 

The value of this {@code cert.provider.x509v1} property has to bechanged to instantiate another implementation. If this security property is not set, a default implementation will be used. Currently, due to possible security restrictions on access to Security properties, this value is looked up and cached at class initialization time and will fallback on a default implementation if the Security property is not accessible.

Note: The classes in the package {@code javax.security.cert}exist for compatibility with earlier versions of the Java Secure Sockets Extension (JSSE). New applications should instead use the standard Java SE certificate classes located in {@code java.security.cert}.

@author Hemma Prafullchandra @since 1.4 @see Certificate @see java.security.cert.X509Extension @see java.security.Security security properties

Implements a X.509v3 certificate according to the following ASN.1 data structure:

 Certificate  ::=  SEQUENCE  { tbsCertificate			TBSCertificate, signatureAlgorithm		AlgorithmIdentifier, signatureValue      	BIT STRING } 

If you want to create a certificate, follow these steps:

XMLObject representing XML Digital Signature, version 20020212, X509Certificate element.