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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 | } | ||