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Java Source | 1998-03-20 | 5.5 KB | 162 lines |
- /*
- * @(#)Certificate.java 1.9 98/03/18
- *
- * Copyright 1997 by Sun Microsystems, Inc.,
- * 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
- * All rights reserved.
- *
- * This software is the confidential and proprietary information
- * of Sun Microsystems, Inc. ("Confidential Information"). You
- * shall not disclose such Confidential Information and shall use
- * it only in accordance with the terms of the license agreement
- * you entered into with Sun.
- */
-
- package java.security.cert;
-
- import java.security.PublicKey;
- import java.security.NoSuchAlgorithmException;
- import java.security.NoSuchProviderException;
- import java.security.InvalidKeyException;
- import java.security.SignatureException;
-
- /**
- * <p>Abstract class for managing a variety of identity certificates.
- * An identity certificate is a guarantee by a principal that
- * a public key is that of 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
- *
- * @author Hemma Prafullchandra
- * @version 1.9 98/03/18
- */
- public abstract class Certificate {
-
- /**
- * 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 = this.getEncoded();
- byte[] otherCert = ((Certificate)other).getEncoded();
-
- if (thisCert.length != otherCert.length)
- return false;
- for (int i = 0; i < thisCert.length; i++)
- if (thisCert[i] != otherCert[i])
- return false;
- return true;
- } 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 = this.getEncoded();
- 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.
- *
- * @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();
- }
-