J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-1999 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.security.x509; |
| 27 | |
| 28 | import java.io.IOException; |
| 29 | import java.security.PublicKey; |
| 30 | import java.security.MessageDigest; |
| 31 | import java.security.NoSuchAlgorithmException; |
| 32 | |
| 33 | import sun.misc.HexDumpEncoder; |
| 34 | import sun.security.util.*; |
| 35 | |
| 36 | /** |
| 37 | * Represent the Key Identifier ASN.1 object. |
| 38 | * |
| 39 | * @author Amit Kapoor |
| 40 | * @author Hemma Prafullchandra |
| 41 | */ |
| 42 | public class KeyIdentifier { |
| 43 | private byte[] octetString; |
| 44 | |
| 45 | /** |
| 46 | * Create a KeyIdentifier with the passed bit settings. |
| 47 | * |
| 48 | * @param octetString the octet string identifying the key identifier. |
| 49 | */ |
| 50 | public KeyIdentifier(byte[] octetString) { |
| 51 | this.octetString = octetString.clone(); |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Create a KeyIdentifier from the DER encoded value. |
| 56 | * |
| 57 | * @param val the DerValue |
| 58 | */ |
| 59 | public KeyIdentifier(DerValue val) throws IOException { |
| 60 | octetString = val.getOctetString(); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Creates a KeyIdentifier from a public-key value. |
| 65 | * |
| 66 | * <p>From RFC2459: Two common methods for generating key identifiers from |
| 67 | * the public key are: |
| 68 | * <ol> |
| 69 | * <li>The keyIdentifier is composed of the 160-bit SHA-1 hash of the |
| 70 | * value of the BIT STRING subjectPublicKey (excluding the tag, |
| 71 | * length, and number of unused bits). |
| 72 | * <p> |
| 73 | * <li>The keyIdentifier is composed of a four bit type field with |
| 74 | * the value 0100 followed by the least significant 60 bits of the |
| 75 | * SHA-1 hash of the value of the BIT STRING subjectPublicKey. |
| 76 | * </ol> |
| 77 | * <p>This method supports method 1. |
| 78 | * |
| 79 | * @param pubKey the public key from which to construct this KeyIdentifier |
| 80 | * @throws IOException on parsing errors |
| 81 | */ |
| 82 | public KeyIdentifier(PublicKey pubKey) |
| 83 | throws IOException |
| 84 | { |
| 85 | DerValue algAndKey = new DerValue(pubKey.getEncoded()); |
| 86 | if (algAndKey.tag != DerValue.tag_Sequence) |
| 87 | throw new IOException("PublicKey value is not a valid " |
| 88 | + "X.509 public key"); |
| 89 | |
| 90 | AlgorithmId algid = AlgorithmId.parse(algAndKey.data.getDerValue()); |
| 91 | byte[] key = algAndKey.data.getUnalignedBitString().toByteArray(); |
| 92 | |
| 93 | MessageDigest md = null; |
| 94 | try { |
| 95 | md = MessageDigest.getInstance("SHA1"); |
| 96 | } catch (NoSuchAlgorithmException e3) { |
| 97 | throw new IOException("SHA1 not supported"); |
| 98 | } |
| 99 | md.update(key); |
| 100 | this.octetString = md.digest(); |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Return the value of the KeyIdentifier as byte array. |
| 105 | */ |
| 106 | public byte[] getIdentifier() { |
| 107 | return octetString.clone(); |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Returns a printable representation of the KeyUsage. |
| 112 | */ |
| 113 | public String toString() { |
| 114 | String s = "KeyIdentifier [\n"; |
| 115 | |
| 116 | HexDumpEncoder encoder = new HexDumpEncoder(); |
| 117 | s += encoder.encodeBuffer(octetString); |
| 118 | s += "]\n"; |
| 119 | return (s); |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Write the KeyIdentifier to the DerOutputStream. |
| 124 | * |
| 125 | * @param out the DerOutputStream to write the object to. |
| 126 | * @exception IOException |
| 127 | */ |
| 128 | void encode(DerOutputStream out) throws IOException { |
| 129 | out.putOctetString(octetString); |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * Returns a hash code value for this object. |
| 134 | * Objects that are equal will also have the same hashcode. |
| 135 | */ |
| 136 | public int hashCode () { |
| 137 | int retval = 0; |
| 138 | for (int i = 0; i < octetString.length; i++) |
| 139 | retval += octetString[i] * i; |
| 140 | return retval; |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * Indicates whether some other object is "equal to" this one. |
| 145 | */ |
| 146 | public boolean equals(Object other) { |
| 147 | if (this == other) |
| 148 | return true; |
| 149 | if (!(other instanceof KeyIdentifier)) |
| 150 | return false; |
| 151 | return java.util.Arrays.equals(octetString, |
| 152 | ((KeyIdentifier)other).getIdentifier()); |
| 153 | } |
| 154 | } |