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/* * @(#)CertPath.java 1.11 06/04/07 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.security.cert; import java.io.ByteArrayInputStream; import java.io.NotSerializableException; import java.io.ObjectStreamException; import java.io.Serializable; import java.util.Iterator; import java.util.List; /** * An immutable sequence of certificates (a certification path). * <p> * This is an abstract class that defines the methods common to all * <code>CertPath</code>s. Subclasses can handle different kinds of * certificates (X.509, PGP, etc.). * <p> * All <code>CertPath</code> objects have a type, a list of * <code>Certificate</code>s, and one or more supported encodings. Because the * <code>CertPath</code> class is immutable, a <code>CertPath</code> cannot * change in any externally visible way after being constructed. This * stipulation applies to all public fields and methods of this class and any * added or overridden by subclasses. * <p> * The type is a <code>String</code> that identifies the type of * <code>Certificate</code>s in the certification path. For each * certificate <code>cert</code> in a certification path <code>certPath</code>, * <code>cert.getType().equals(certPath.getType())</code> must be * <code>true</code>. * <p> * The list of <code>Certificate</code>s is an ordered <code>List</code> of * zero or more <code>Certificate</code>s. This <code>List</code> and all * of the <code>Certificate</code>s contained in it must be immutable. * <p> * Each <code>CertPath</code> object must support one or more encodings * so that the object can be translated into a byte array for storage or * transmission to other parties. Preferably, these encodings should be * well-documented standards (such as PKCS#7). One of the encodings supported * by a <code>CertPath</code> is considered the default encoding. This * encoding is used if no encoding is explicitly requested (for the * {@link #getEncoded() getEncoded()} method, for instance). * <p> * All <code>CertPath</code> objects are also <code>Serializable</code>. * <code>CertPath</code> objects are resolved into an alternate * {@link CertPathRep CertPathRep} object during serialization. This allows * a <code>CertPath</code> object to be serialized into an equivalent * representation regardless of its underlying implementation. * <p> * <code>CertPath</code> objects can be created with a * <code>CertificateFactory</code> or they can be returned by other classes, * such as a <code>CertPathBuilder</code>. * <p> * By convention, X.509 <code>CertPath</code>s (consisting of * <code>X509Certificate</code>s), are ordered starting with the target * certificate and ending with a certificate issued by the trust anchor. That * is, the issuer of one certificate is the subject of the following one. The * certificate representing the {@link TrustAnchor TrustAnchor} should not be * included in the certification path. Unvalidated X.509 <code>CertPath</code>s * may not follow these conventions. PKIX <code>CertPathValidator</code>s will * detect any departure from these conventions that cause the certification * path to be invalid and throw a <code>CertPathValidatorException</code>. * <p> * <b>Concurrent Access</b> * <p> * All <code>CertPath</code> objects must be thread-safe. That is, multiple * threads may concurrently invoke the methods defined in this class on a * single <code>CertPath</code> object (or more than one) with no * ill effects. This is also true for the <code>List</code> returned by * <code>CertPath.getCertificates</code>. * <p> * Requiring <code>CertPath</code> objects to be immutable and thread-safe * allows them to be passed around to various pieces of code without worrying * about coordinating access. Providing this thread-safety is * generally not difficult, since the <code>CertPath</code> and * <code>List</code> objects in question are immutable. * * @see CertificateFactory * @see CertPathBuilder * * @version 1.11 04/07/06 * @author Yassir Elley * @since 1.4 */ public abstract class CertPath implements Serializable { private static final long serialVersionUID = 6068470306649138683L; private String type; // the type of certificates in this chain /** * Creates a <code>CertPath</code> of the specified type. * <p> * This constructor is protected because most users should use a * <code>CertificateFactory</code> to create <code>CertPath</code>s. * * @param type the standard name of the type of * <code>Certificate</code>s in this path */ protected CertPath(String type) { this.type = type; } /** * Returns the type of <code>Certificate</code>s in this certification * path. This is the same string that would be returned by * {@link java.security.cert.Certificate#getType() cert.getType()} * for all <code>Certificate</code>s in the certification path. * * @return the type of <code>Certificate</code>s in this certification * path (never null) */ public String getType() { return type; } /** * Returns an iteration of the encodings supported by this certification * path, with the default encoding first. Attempts to modify the returned * <code>Iterator</code> via its <code>remove</code> method result in an * <code>UnsupportedOperationException</code>. * * @return an <code>Iterator</code> over the names of the supported * encodings (as Strings) */ public abstract Iterator<String> getEncodings(); /** * Compares this certification path for equality with the specified * object. Two <code>CertPath</code>s are equal if and only if their * types are equal and their certificate <code>List</code>s (and by * implication the <code>Certificate</code>s in those <code>List</code>s) * are equal. A <code>CertPath</code> is never equal to an object that is * not a <code>CertPath</code>. * <p> * This algorithm is implemented by this method. If it is overridden, * the behavior specified here must be maintained. * * @param other the object to test for equality with this certification path * @return true if the specified object is equal to this certification path, * false otherwise */ public boolean equals(Object other) { if (this == other) return true; if (! (other instanceof CertPath)) return false; CertPath otherCP = (CertPath) other; if (! otherCP.getType().equals(type)) return false; List thisCertList = this.getCertificates(); List otherCertList = otherCP.getCertificates(); return(thisCertList.equals(otherCertList)); } /** * Returns the hashcode for this certification path. The hash code of * a certification path is defined to be the result of the following * calculation: * <pre><code> * hashCode = path.getType().hashCode(); * hashCode = 31*hashCode + path.getCertificates().hashCode(); * </code></pre> * This ensures that <code>path1.equals(path2)</code> implies that * <code>path1.hashCode()==path2.hashCode()</code> for any two certification * paths, <code>path1</code> and <code>path2</code>, as required by the * general contract of <code>Object.hashCode</code>. * * @return the hashcode value for this certification path */ public int hashCode() { int hashCode = type.hashCode(); hashCode = 31*hashCode + getCertificates().hashCode(); return hashCode; } /** * Returns a string representation of this certification path. * This calls the <code>toString</code> method on each of the * <code>Certificate</code>s in the path. * * @return a string representation of this certification path */ public String toString() { StringBuffer sb = new StringBuffer(); Iterator stringIterator = getCertificates().iterator(); sb.append("\n" + type + " Cert Path: length = " + getCertificates().size() + ".\n"); sb.append("[\n"); int i = 1; while (stringIterator.hasNext()) { sb.append("==========================================" + "===============Certificate " + i + " start.\n"); Certificate stringCert = (Certificate) stringIterator.next(); sb.append(stringCert.toString()); sb.append("\n========================================" + "=================Certificate " + i + " end.\n\n\n"); i++; } sb.append("\n]"); return sb.toString(); } /** * Returns the encoded form of this certification path, using the default * encoding. * * @return the encoded bytes * @exception CertificateEncodingException if an encoding error occurs */ public abstract byte[] getEncoded() throws CertificateEncodingException; /** * Returns the encoded form of this certification path, using the * specified encoding. * * @param encoding the name of the encoding to use * @return the encoded bytes * @exception CertificateEncodingException if an encoding error occurs or * the encoding requested is not supported */ public abstract byte[] getEncoded(String encoding) throws CertificateEncodingException; /** * Returns the list of certificates in this certification path. * The <code>List</code> returned must be immutable and thread-safe. * * @return an immutable <code>List</code> of <code>Certificate</code>s * (may be empty, but not null) */ public abstract List<? extends Certificate> getCertificates(); /** * Replaces the <code>CertPath</code> to be serialized with a * <code>CertPathRep</code> object. * * @return the <code>CertPathRep</code> to be serialized * * @throws ObjectStreamException if a <code>CertPathRep</code> object * representing this certification path could not be created */ protected Object writeReplace() throws ObjectStreamException { try { return new CertPathRep(type, getEncoded()); } catch (CertificateException ce) { NotSerializableException nse = new NotSerializableException ("java.security.cert.CertPath: " + type); nse.initCause(ce); throw nse; } } /** * Alternate <code>CertPath</code> class for serialization. * @since 1.4 */ protected static class CertPathRep implements Serializable { private static final long serialVersionUID = 3015633072427920915L; /** The Certificate type */ private String type; /** The encoded form of the cert path */ private byte[] data; /** * Creates a <code>CertPathRep</code> with the specified * type and encoded form of a certification path. * * @param type the standard name of a <code>CertPath</code> type * @param data the encoded form of the certification path */ protected CertPathRep(String type, byte[] data) { this.type = type; this.data = data; } /** * Returns a <code>CertPath</code> constructed from the type and data. * * @return the resolved <code>CertPath</code> object * * @throws ObjectStreamException if a <code>CertPath</code> could not * be constructed */ protected Object readResolve() throws ObjectStreamException { try { CertificateFactory cf = CertificateFactory.getInstance(type); return cf.generateCertPath(new ByteArrayInputStream(data)); } catch (CertificateException ce) { NotSerializableException nse = new NotSerializableException ("java.security.cert.CertPath: " + type); nse.initCause(ce); throw nse; } } } }