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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 | } | ||