J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-2007 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 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 | } |