mirror of git://gcc.gnu.org/git/gcc.git
307 lines
9.4 KiB
Java
307 lines
9.4 KiB
Java
/* Certificate.java --- Certificate class
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Copyright (C) 1999, 2003, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.security.cert;
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import java.io.ByteArrayInputStream;
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import java.io.InvalidObjectException;
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import java.io.ObjectStreamException;
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import java.io.Serializable;
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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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import java.security.NoSuchProviderException;
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import java.security.PublicKey;
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import java.security.SignatureException;
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/**
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* The Certificate class is an abstract class used to manage
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* identity certificates. An identity certificate is a
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* combination of a principal and a public key which is
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* certified by another principal. This is the puprose of
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* Certificate Authorities (CA).
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*
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* <p>This class is used to manage different types of certificates
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* but have important common puposes. Different types of
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* certificates like X.509 and OpenPGP share general certificate
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* functions (like encoding and verifying) and information like
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* public keys.
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*
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* <p>X.509, OpenPGP, and SDSI can be implemented by subclassing this
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* class even though they differ in storage methods and information
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* stored.
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*
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* @see CertificateFactory
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* @see X509Certificate
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* @since JDK 1.2
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* @author Mark Benvenuto
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* @author Casey Marshall
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*/
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public abstract class Certificate implements Serializable
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{
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private static final long serialVersionUID = -3585440601605666277L;
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private String type;
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/**
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Constructs a new certificate of the specified type. An example
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is "X.509".
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@param type a valid standard name for a certificate.
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*/
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protected Certificate(String type)
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{
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this.type = type;
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}
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/**
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Returns the Certificate type.
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@return a string representing the Certificate type
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*/
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public final String getType()
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{
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return type;
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}
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/**
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Compares this Certificate to other. It checks if the
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object if instanceOf Certificate and then checks if
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the encoded form matches.
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@param other An Object to test for equality
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@return true if equal, false otherwise
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*/
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public boolean equals(Object other)
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{
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if( other instanceof Certificate ) {
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try {
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Certificate x = (Certificate) other;
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if( getEncoded().length != x.getEncoded().length )
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return false;
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byte[] b1 = getEncoded();
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byte[] b2 = x.getEncoded();
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for( int i = 0; i < b1.length; i++ )
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if( b1[i] != b2[i] )
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return false;
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} catch( CertificateEncodingException cee ) {
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return false;
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}
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return true;
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}
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return false;
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}
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/**
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Returns a hash code for this Certificate in its encoded
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form.
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@return A hash code of this class
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*/
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public int hashCode()
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{
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return super.hashCode();
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}
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/**
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Gets the DER ASN.1 encoded format for this Certificate.
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It assumes each certificate has only one encoding format.
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Ex: X.509 is encoded as ASN.1 DER
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@return byte array containg encoded form
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@throws CertificateEncodingException if an error occurs
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*/
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public abstract byte[] getEncoded() throws CertificateEncodingException;
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/**
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Verifies that this Certificate was properly signed with the
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PublicKey that corresponds to its private key.
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@param key PublicKey to verify with
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@throws CertificateException encoding error
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@throws NoSuchAlgorithmException unsupported algorithm
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@throws InvalidKeyException incorrect key
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@throws NoSuchProviderException no provider
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@throws SignatureException signature error
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*/
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public abstract void verify(PublicKey key)
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throws CertificateException,
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NoSuchAlgorithmException,
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InvalidKeyException,
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NoSuchProviderException,
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SignatureException;
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/**
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Verifies that this Certificate was properly signed with the
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PublicKey that corresponds to its private key and uses
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the signature engine provided by the provider.
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@param key PublicKey to verify with
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@param sigProvider Provider to use for signature algorithm
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@throws CertificateException encoding error
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@throws NoSuchAlgorithmException unsupported algorithm
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@throws InvalidKeyException incorrect key
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@throws NoSuchProviderException incorrect provider
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@throws SignatureException signature error
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*/
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public abstract void verify(PublicKey key,
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String sigProvider)
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throws CertificateException,
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NoSuchAlgorithmException,
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InvalidKeyException,
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NoSuchProviderException,
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SignatureException;
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/**
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Returns a string representing the Certificate.
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@return a string representing the Certificate.
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*/
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public abstract String toString();
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/**
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Returns the public key stored in the Certificate.
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@return The public key
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*/
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public abstract PublicKey getPublicKey();
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// Protected methods.
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// ------------------------------------------------------------------------
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/**
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* Returns a replacement for this certificate to be serialized. This
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* method returns the equivalent to the following for this class:
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*
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* <blockquote>
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* <pre>new CertificateRep(getType(), getEncoded());</pre>
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* </blockquote>
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*
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* <p>This thusly replaces the certificate with its name and its
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* encoded form, which can be deserialized later with the {@link
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* CertificateFactory} implementation for this certificate's type.
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*
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* @return The replacement object to be serialized.
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* @throws ObjectStreamException If the replacement could not be
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* created.
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*/
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protected Object writeReplace() throws ObjectStreamException
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{
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try
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{
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return new CertificateRep(getType(), getEncoded());
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}
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catch (CertificateEncodingException cee)
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{
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throw new InvalidObjectException(cee.toString());
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}
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}
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// Inner class.
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// ------------------------------------------------------------------------
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/**
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Certificate.CertificateRep is an inner class used to provide an alternate
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storage mechanism for serialized Certificates.
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*/
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protected static class CertificateRep implements java.io.Serializable
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{
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/** From JDK1.4. */
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private static final long serialVersionUID = -8563758940495660020L;
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/** The certificate type, e.g. "X.509". */
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private String type;
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/** The encoded certificate data. */
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private byte[] data;
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/**
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* Create an alternative representation of this certificate. The
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* <code>(type, data)</code> pair is typically the certificate's
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* type as returned by {@link Certificate#getType()} (i.e. the
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* canonical name of the certificate type) and the encoded form as
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* returned by {@link Certificate#getEncoded()}.
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*
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* <p>For example, X.509 certificates would create an instance of
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* this class with the parameters "X.509" and the ASN.1
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* representation of the certificate, encoded as DER bytes.
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*
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* @param type The certificate type.
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* @param data The encoded certificate data.
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*/
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protected CertificateRep(String type, byte[] data)
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{
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this.type = type;
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this.data = data;
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}
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/**
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* Deserialize this certificate replacement into the appropriate
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* certificate object. That is, this method attempts to create a
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* {@link CertificateFactory} for this certificate's type, then
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* attempts to parse the encoded data with that factory, returning
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* the resulting certificate.
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*
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* @return The deserialized certificate.
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* @throws ObjectStreamException If there is no appropriate
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* certificate factory for the given type, or if the encoded form
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* cannot be parsed.
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*/
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protected Object readResolve() throws ObjectStreamException
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{
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try
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{
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CertificateFactory fact = CertificateFactory.getInstance(type);
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return fact.generateCertificate(new ByteArrayInputStream(data));
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}
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catch (Exception e)
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{
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throw new InvalidObjectException(e.toString());
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}
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}
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}
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}
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