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Java example source code file (KeyIdentifier.java)
The KeyIdentifier.java Java example source code/* * Copyright (c) 1997, 1999, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package sun.security.x509; import java.io.IOException; import java.security.PublicKey; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import sun.misc.HexDumpEncoder; import sun.security.util.*; /** * Represent the Key Identifier ASN.1 object. * * @author Amit Kapoor * @author Hemma Prafullchandra */ public class KeyIdentifier { private byte[] octetString; /** * Create a KeyIdentifier with the passed bit settings. * * @param octetString the octet string identifying the key identifier. */ public KeyIdentifier(byte[] octetString) { this.octetString = octetString.clone(); } /** * Create a KeyIdentifier from the DER encoded value. * * @param val the DerValue */ public KeyIdentifier(DerValue val) throws IOException { octetString = val.getOctetString(); } /** * Creates a KeyIdentifier from a public-key value. * * <p>From RFC2459: Two common methods for generating key identifiers from * the public key are: * <ol> * <li>The keyIdentifier is composed of the 160-bit SHA-1 hash of the * value of the BIT STRING subjectPublicKey (excluding the tag, * length, and number of unused bits). * <p> * <li>The keyIdentifier is composed of a four bit type field with * the value 0100 followed by the least significant 60 bits of the * SHA-1 hash of the value of the BIT STRING subjectPublicKey. * </ol> * <p>This method supports method 1. * * @param pubKey the public key from which to construct this KeyIdentifier * @throws IOException on parsing errors */ public KeyIdentifier(PublicKey pubKey) throws IOException { DerValue algAndKey = new DerValue(pubKey.getEncoded()); if (algAndKey.tag != DerValue.tag_Sequence) throw new IOException("PublicKey value is not a valid " + "X.509 public key"); AlgorithmId algid = AlgorithmId.parse(algAndKey.data.getDerValue()); byte[] key = algAndKey.data.getUnalignedBitString().toByteArray(); MessageDigest md = null; try { md = MessageDigest.getInstance("SHA1"); } catch (NoSuchAlgorithmException e3) { throw new IOException("SHA1 not supported"); } md.update(key); this.octetString = md.digest(); } /** * Return the value of the KeyIdentifier as byte array. */ public byte[] getIdentifier() { return octetString.clone(); } /** * Returns a printable representation of the KeyUsage. */ public String toString() { String s = "KeyIdentifier [\n"; HexDumpEncoder encoder = new HexDumpEncoder(); s += encoder.encodeBuffer(octetString); s += "]\n"; return (s); } /** * Write the KeyIdentifier to the DerOutputStream. * * @param out the DerOutputStream to write the object to. * @exception IOException */ void encode(DerOutputStream out) throws IOException { out.putOctetString(octetString); } /** * Returns a hash code value for this object. * Objects that are equal will also have the same hashcode. */ public int hashCode () { int retval = 0; for (int i = 0; i < octetString.length; i++) retval += octetString[i] * i; return retval; } /** * Indicates whether some other object is "equal to" this one. */ public boolean equals(Object other) { if (this == other) return true; if (!(other instanceof KeyIdentifier)) return false; return java.util.Arrays.equals(octetString, ((KeyIdentifier)other).getIdentifier()); } } Other Java examples (source code examples)Here is a short list of links related to this Java KeyIdentifier.java source code file: |
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