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| 1 | +/* | |
| 2 | + * Copyright (c) 1997, 2007, 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 com.sun.crypto.provider; | |
| 27 | + | |
| 28 | +import java.util.*; | |
| 29 | +import java.io.*; | |
| 30 | +import sun.security.util.*; | |
| 31 | +import java.math.BigInteger; | |
| 32 | +import java.security.AlgorithmParametersSpi; | |
| 33 | +import java.security.spec.AlgorithmParameterSpec; | |
| 34 | +import java.security.spec.InvalidParameterSpecException; | |
| 35 | +import javax.crypto.spec.DHParameterSpec; | |
| 36 | + | |
| 37 | +/** | |
| 38 | + * This class implements the parameter set used by the | |
| 39 | + * Diffie-Hellman key agreement as defined in the PKCS #3 standard. | |
| 40 | + * | |
| 41 | + * @author Jan Luehe | |
| 42 | + * | |
| 43 | + */ | |
| 44 | +public final class DHParameters extends AlgorithmParametersSpi { | |
| 45 | + | |
| 46 | + // The prime (p). | |
| 47 | + private BigInteger p = BigInteger.ZERO; | |
| 48 | + | |
| 49 | + // The base (g). | |
| 50 | + private BigInteger g = BigInteger.ZERO; | |
| 51 | + | |
| 52 | + // The private-value length (l) | |
| 53 | + private int l = 0; | |
| 54 | + | |
| 55 | + protected void engineInit(AlgorithmParameterSpec paramSpec) | |
| 56 | + throws InvalidParameterSpecException { | |
| 57 | + if (!(paramSpec instanceof DHParameterSpec)) { | |
| 58 | + throw new InvalidParameterSpecException | |
| 59 | + ("Inappropriate parameter specification"); | |
| 60 | + } | |
| 61 | + this.p = ((DHParameterSpec)paramSpec).getP(); | |
| 62 | + this.g = ((DHParameterSpec)paramSpec).getG(); | |
| 63 | + this.l = ((DHParameterSpec)paramSpec).getL(); | |
| 64 | + } | |
| 65 | + | |
| 66 | + protected void engineInit(byte[] params) throws IOException { | |
| 67 | + try { | |
| 68 | + DerValue encodedParams = new DerValue(params); | |
| 69 | + | |
| 70 | + if (encodedParams.tag != DerValue.tag_Sequence) { | |
| 71 | + throw new IOException("DH params parsing error"); | |
| 72 | + } | |
| 73 | + | |
| 74 | + encodedParams.data.reset(); | |
| 75 | + | |
| 76 | + this.p = encodedParams.data.getBigInteger(); | |
| 77 | + this.g = encodedParams.data.getBigInteger(); | |
| 78 | + | |
| 79 | + // Private-value length is OPTIONAL | |
| 80 | + if (encodedParams.data.available() != 0) { | |
| 81 | + this.l = encodedParams.data.getInteger(); | |
| 82 | + } | |
| 83 | + | |
| 84 | + if (encodedParams.data.available() != 0) { | |
| 85 | + throw new IOException | |
| 86 | + ("DH parameter parsing error: Extra data"); | |
| 87 | + } | |
| 88 | + } catch (NumberFormatException e) { | |
| 89 | + throw new IOException("Private-value length too big"); | |
| 90 | + } | |
| 91 | + } | |
| 92 | + | |
| 93 | + protected void engineInit(byte[] params, String decodingMethod) | |
| 94 | + throws IOException { | |
| 95 | + engineInit(params); | |
| 96 | + } | |
| 97 | + | |
| 98 | + protected AlgorithmParameterSpec engineGetParameterSpec(Class paramSpec) | |
| 99 | + throws InvalidParameterSpecException { | |
| 100 | + | |
| 101 | + if (DHParameterSpec.class.isAssignableFrom(paramSpec)) { | |
| 102 | + return new DHParameterSpec(this.p, this.g, this.l); | |
| 103 | + } else { | |
| 104 | + throw new InvalidParameterSpecException | |
| 105 | + ("Inappropriate parameter Specification"); | |
| 106 | + } | |
| 107 | + } | |
| 108 | + | |
| 109 | + protected byte[] engineGetEncoded() throws IOException { | |
| 110 | + DerOutputStream out = new DerOutputStream(); | |
| 111 | + DerOutputStream bytes = new DerOutputStream(); | |
| 112 | + | |
| 113 | + bytes.putInteger(this.p); | |
| 114 | + bytes.putInteger(this.g); | |
| 115 | + // Private-value length is OPTIONAL | |
| 116 | + if (this.l > 0) { | |
| 117 | + bytes.putInteger(this.l); | |
| 118 | + } | |
| 119 | + out.write(DerValue.tag_Sequence, bytes); | |
| 120 | + return out.toByteArray(); | |
| 121 | + } | |
| 122 | + | |
| 123 | + protected byte[] engineGetEncoded(String encodingMethod) | |
| 124 | + throws IOException { | |
| 125 | + return engineGetEncoded(); | |
| 126 | + } | |
| 127 | + | |
| 128 | + /* | |
| 129 | + * Returns a formatted string describing the parameters. | |
| 130 | + */ | |
| 131 | + protected String engineToString() { | |
| 132 | + String LINE_SEP = System.getProperty("line.separator"); | |
| 133 | + | |
| 134 | + StringBuffer strbuf | |
| 135 | + = new StringBuffer("SunJCE Diffie-Hellman Parameters:" | |
| 136 | + + LINE_SEP + "p:" + LINE_SEP | |
| 137 | + + Debug.toHexString(this.p) | |
| 138 | + + LINE_SEP + "g:" + LINE_SEP | |
| 139 | + + Debug.toHexString(this.g)); | |
| 140 | + if (this.l != 0) | |
| 141 | + strbuf.append(LINE_SEP + "l:" + LINE_SEP + " " + this.l); | |
| 142 | + return strbuf.toString(); | |
| 143 | + } | |
| 144 | +} | |