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| 1 | +/* | |
| 2 | + * Copyright (c) 1996, 2005, Oracle and/or its affiliates. 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. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.security.provider; | |
| 27 | + | |
| 28 | +import java.util.*; | |
| 29 | +import java.io.*; | |
| 30 | +import java.math.BigInteger; | |
| 31 | +import java.security.InvalidKeyException; | |
| 32 | +import java.security.ProviderException; | |
| 33 | +import java.security.AlgorithmParameters; | |
| 34 | +import java.security.spec.DSAParameterSpec; | |
| 35 | +import java.security.spec.InvalidParameterSpecException; | |
| 36 | +import java.security.interfaces.DSAParams; | |
| 37 | + | |
| 38 | +import sun.security.x509.X509Key; | |
| 39 | +import sun.security.x509.AlgIdDSA; | |
| 40 | +import sun.security.util.Debug; | |
| 41 | +import sun.security.util.DerValue; | |
| 42 | +import sun.security.util.DerInputStream; | |
| 43 | +import sun.security.util.DerOutputStream; | |
| 44 | + | |
| 45 | +/** | |
| 46 | + * An X.509 public key for the Digital Signature Algorithm. | |
| 47 | + * | |
| 48 | + * @author Benjamin Renaud | |
| 49 | + * | |
| 50 | + * | |
| 51 | + * @see DSAPrivateKey | |
| 52 | + * @see AlgIdDSA | |
| 53 | + * @see DSA | |
| 54 | + */ | |
| 55 | + | |
| 56 | +public class DSAPublicKey extends X509Key | |
| 57 | +implements java.security.interfaces.DSAPublicKey, Serializable { | |
| 58 | + | |
| 59 | + /** use serialVersionUID from JDK 1.1. for interoperability */ | |
| 60 | + private static final long serialVersionUID = -2994193307391104133L; | |
| 61 | + | |
| 62 | + /* the public key */ | |
| 63 | + private BigInteger y; | |
| 64 | + | |
| 65 | + /* | |
| 66 | + * Keep this constructor for backwards compatibility with JDK1.1. | |
| 67 | + */ | |
| 68 | + public DSAPublicKey() { | |
| 69 | + } | |
| 70 | + | |
| 71 | + /** | |
| 72 | + * Make a DSA public key out of a public key and three parameters. | |
| 73 | + * The p, q, and g parameters may be null, but if so, parameters will need | |
| 74 | + * to be supplied from some other source before this key can be used in | |
| 75 | + * cryptographic operations. PKIX RFC2459bis explicitly allows DSA public | |
| 76 | + * keys without parameters, where the parameters are provided in the | |
| 77 | + * issuer's DSA public key. | |
| 78 | + * | |
| 79 | + * @param y the actual key bits | |
| 80 | + * @param p DSA parameter p, may be null if all of p, q, and g are null. | |
| 81 | + * @param q DSA parameter q, may be null if all of p, q, and g are null. | |
| 82 | + * @param g DSA parameter g, may be null if all of p, q, and g are null. | |
| 83 | + */ | |
| 84 | + public DSAPublicKey(BigInteger y, BigInteger p, BigInteger q, | |
| 85 | + BigInteger g) | |
| 86 | + throws InvalidKeyException { | |
| 87 | + this.y = y; | |
| 88 | + algid = new AlgIdDSA(p, q, g); | |
| 89 | + | |
| 90 | + try { | |
| 91 | + key = new DerValue(DerValue.tag_Integer, | |
| 92 | + y.toByteArray()).toByteArray(); | |
| 93 | + encode(); | |
| 94 | + } catch (IOException e) { | |
| 95 | + throw new InvalidKeyException("could not DER encode y: " + | |
| 96 | + e.getMessage()); | |
| 97 | + } | |
| 98 | + } | |
| 99 | + | |
| 100 | + /** | |
| 101 | + * Make a DSA public key from its DER encoding (X.509). | |
| 102 | + */ | |
| 103 | + public DSAPublicKey(byte[] encoded) throws InvalidKeyException { | |
| 104 | + decode(encoded); | |
| 105 | + } | |
| 106 | + | |
| 107 | + /** | |
| 108 | + * Returns the DSA parameters associated with this key, or null if the | |
| 109 | + * parameters could not be parsed. | |
| 110 | + */ | |
| 111 | + public DSAParams getParams() { | |
| 112 | + try { | |
| 113 | + if (algid instanceof DSAParams) { | |
| 114 | + return (DSAParams)algid; | |
| 115 | + } else { | |
| 116 | + DSAParameterSpec paramSpec; | |
| 117 | + AlgorithmParameters algParams = algid.getParameters(); | |
| 118 | + if (algParams == null) { | |
| 119 | + return null; | |
| 120 | + } | |
| 121 | + paramSpec = algParams.getParameterSpec(DSAParameterSpec.class); | |
| 122 | + return (DSAParams)paramSpec; | |
| 123 | + } | |
| 124 | + } catch (InvalidParameterSpecException e) { | |
| 125 | + return null; | |
| 126 | + } | |
| 127 | + } | |
| 128 | + | |
| 129 | + /** | |
| 130 | + * Get the raw public value, y, without the parameters. | |
| 131 | + * | |
| 132 | + * @see getParameters | |
| 133 | + */ | |
| 134 | + public BigInteger getY() { | |
| 135 | + return y; | |
| 136 | + } | |
| 137 | + | |
| 138 | + public String toString() { | |
| 139 | + return "Sun DSA Public Key\n Parameters:" + algid | |
| 140 | + + "\n y:\n" + Debug.toHexString(y) + "\n"; | |
| 141 | + } | |
| 142 | + | |
| 143 | + protected void parseKeyBits() throws InvalidKeyException { | |
| 144 | + try { | |
| 145 | + DerInputStream in = new DerInputStream(key); | |
| 146 | + y = in.getBigInteger(); | |
| 147 | + } catch (IOException e) { | |
| 148 | + throw new InvalidKeyException("Invalid key: y value\n" + | |
| 149 | + e.getMessage()); | |
| 150 | + } | |
| 151 | + } | |
| 152 | +} | |