/*
* @(#)Certificate.java 1.27 06/04/21
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.security.cert;
import java.util.Arrays;
import java.security.PublicKey;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.InvalidKeyException;
import java.security.SignatureException;
import sun.security.x509.X509CertImpl;
/**
* <p>Abstract class for managing a variety of identity certificates.
* An identity certificate is a binding of a principal to a public key which
* is vouched for by another principal. (A principal represents
* an entity such as an individual user, a group, or a corporation.)
*<p>
* This class is an abstraction for certificates that have different
* formats but important common uses. For example, different types of
* certificates, such as X.509 and PGP, share general certificate
* functionality (like encoding and verifying) and
* some types of information (like a public key).
* <p>
* X.509, PGP, and SDSI certificates can all be implemented by
* subclassing the Certificate class, even though they contain different
* sets of information, and they store and retrieve the information in
* different ways.
*
* @see X509Certificate
* @see CertificateFactory
*
* @author Hemma Prafullchandra
* @version 1.27, 04/21/06
*/
public abstract class Certificate implements java.io.Serializable {
private static final long serialVersionUID = -3585440601605666277L;
// the certificate type
private final String type;
/**
* Creates a certificate of the specified type.
*
* @param type the standard name of the certificate type.
* See Appendix A in the <a href=
* "../../../../technotes/guides/security/crypto/CryptoSpec.html#AppA">
* Java Cryptography Architecture API Specification & Reference </a>
* for information about standard certificate types.
*/
protected Certificate(String type) {
this.type = type;
}
/**
* Returns the type of this certificate.
*
* @return the type of this certificate.
*/
public final String getType() {
return this.type;
}
/**
* Compares this certificate for equality with the specified
* object. If the <code>other</code> object is an
* <code>instanceof</code> <code>Certificate</code>, then
* its encoded form is retrieved and compared with the
* encoded form of this certificate.
*
* @param other the object to test for equality with this certificate.
* @return true iff the encoded forms of the two certificates
* match, false otherwise.
*/
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!(other instanceof Certificate)) {
return false;
}
try {
byte[] thisCert = X509CertImpl.getEncodedInternal(this);
byte[] otherCert = X509CertImpl.getEncodedInternal((Certificate)other);
return Arrays.equals(thisCert, otherCert);
} catch (CertificateException e) {
return false;
}
}
/**
* Returns a hashcode value for this certificate from its
* encoded form.
*
* @return the hashcode value.
*/
public int hashCode() {
int retval = 0;
try {
byte[] certData = X509CertImpl.getEncodedInternal(this);
for (int i = 1; i < certData.length; i++) {
retval += certData[i] * i;
}
return retval;
} catch (CertificateException e) {
return retval;
}
}
/**
* Returns the encoded form of this certificate. It is
* assumed that each certificate type would have only a single
* form of encoding; for example, X.509 certificates would
* be encoded as ASN.1 DER.
*
* @return the encoded form of this certificate
*
* @exception CertificateEncodingException if an encoding error occurs.
*/
public abstract byte[] getEncoded()
throws CertificateEncodingException;
/**
* Verifies that this certificate was signed using the
* private key that corresponds to the specified public key.
*
* @param key the PublicKey used to carry out the verification.
*
* @exception NoSuchAlgorithmException on unsupported signature
* algorithms.
* @exception InvalidKeyException on incorrect key.
* @exception NoSuchProviderException if there's no default provider.
* @exception SignatureException on signature errors.
* @exception CertificateException on encoding errors.
*/
public abstract void verify(PublicKey key)
throws CertificateException, NoSuchAlgorithmException,
InvalidKeyException, NoSuchProviderException,
SignatureException;
/**
* Verifies that this certificate was signed using the
* private key that corresponds to the specified public key.
* This method uses the signature verification engine
* supplied by the specified provider.
*
* @param key the PublicKey used to carry out the verification.
* @param sigProvider the name of the signature provider.
*
* @exception NoSuchAlgorithmException on unsupported signature
* algorithms.
* @exception InvalidKeyException on incorrect key.
* @exception NoSuchProviderException on incorrect provider.
* @exception SignatureException on signature errors.
* @exception CertificateException on encoding errors.
*/
public abstract void verify(PublicKey key, String sigProvider)
throws CertificateException, NoSuchAlgorithmException,
InvalidKeyException, NoSuchProviderException,
SignatureException;
/**
* Returns a string representation of this certificate.
*
* @return a string representation of this certificate.
*/
public abstract String toString();
/**
* Gets the public key from this certificate.
*
* @return the public key.
*/
public abstract PublicKey getPublicKey();
/**
* Alternate Certificate class for serialization.
* @since 1.3
*/
protected static class CertificateRep implements java.io.Serializable {
private static final long serialVersionUID = -8563758940495660020L;
private String type;
private byte[] data;
/**
* Construct the alternate Certificate class with the Certificate
* type and Certificate encoding bytes.
*
* <p>
*
* @param type the standard name of the Certificate type. <p>
*
* @param data the Certificate data.
*/
protected CertificateRep(String type, byte[] data) {
this.type = type;
this.data = data;
}
/**
* Resolve the Certificate Object.
*
* <p>
*
* @return the resolved Certificate Object
*
* @throws java.io.ObjectStreamException if the Certificate
* could not be resolved
*/
protected Object readResolve() throws java.io.ObjectStreamException {
try {
CertificateFactory cf = CertificateFactory.getInstance(type);
return cf.generateCertificate
(new java.io.ByteArrayInputStream(data));
} catch (CertificateException e) {
throw new java.io.NotSerializableException
("java.security.cert.Certificate: " +
type +
": " +
e.getMessage());
}
}
}
/**
* Replace the Certificate to be serialized.
*
* @return the alternate Certificate object to be serialized
*
* @throws java.io.ObjectStreamException if a new object representing
* this Certificate could not be created
* @since 1.3
*/
protected Object writeReplace() throws java.io.ObjectStreamException {
try {
return new CertificateRep(type, getEncoded());
} catch (CertificateException e) {
throw new java.io.NotSerializableException
("java.security.cert.Certificate: " +
type +
": " +
e.getMessage());
}
}
}
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