| /* |
| * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.crypto.provider; |
| |
| import java.io.*; |
| import sun.security.util.*; |
| import java.math.BigInteger; |
| import java.security.AlgorithmParametersSpi; |
| import java.security.spec.AlgorithmParameterSpec; |
| import java.security.spec.InvalidParameterSpecException; |
| import javax.crypto.spec.DHParameterSpec; |
| |
| /** |
| * This class implements the parameter set used by the |
| * Diffie-Hellman key agreement as defined in the PKCS #3 standard. |
| * |
| * @author Jan Luehe |
| * |
| */ |
| public final class DHParameters extends AlgorithmParametersSpi { |
| |
| // The prime (p). |
| private BigInteger p = BigInteger.ZERO; |
| |
| // The base (g). |
| private BigInteger g = BigInteger.ZERO; |
| |
| // The private-value length (l) |
| private int l = 0; |
| |
| protected void engineInit(AlgorithmParameterSpec paramSpec) |
| throws InvalidParameterSpecException { |
| if (!(paramSpec instanceof DHParameterSpec)) { |
| throw new InvalidParameterSpecException |
| ("Inappropriate parameter specification"); |
| } |
| this.p = ((DHParameterSpec)paramSpec).getP(); |
| this.g = ((DHParameterSpec)paramSpec).getG(); |
| this.l = ((DHParameterSpec)paramSpec).getL(); |
| } |
| |
| protected void engineInit(byte[] params) throws IOException { |
| try { |
| DerValue encodedParams = new DerValue(params); |
| |
| if (encodedParams.tag != DerValue.tag_Sequence) { |
| throw new IOException("DH params parsing error"); |
| } |
| |
| encodedParams.data.reset(); |
| |
| this.p = encodedParams.data.getBigInteger(); |
| this.g = encodedParams.data.getBigInteger(); |
| |
| // Private-value length is OPTIONAL |
| if (encodedParams.data.available() != 0) { |
| this.l = encodedParams.data.getInteger(); |
| } |
| |
| if (encodedParams.data.available() != 0) { |
| throw new IOException |
| ("DH parameter parsing error: Extra data"); |
| } |
| } catch (NumberFormatException e) { |
| throw new IOException("Private-value length too big"); |
| } |
| } |
| |
| protected void engineInit(byte[] params, String decodingMethod) |
| throws IOException { |
| engineInit(params); |
| } |
| |
| protected <T extends AlgorithmParameterSpec> |
| T engineGetParameterSpec(Class<T> paramSpec) |
| throws InvalidParameterSpecException { |
| |
| if (DHParameterSpec.class.isAssignableFrom(paramSpec)) { |
| return paramSpec.cast(new DHParameterSpec(this.p, this.g, this.l)); |
| } else { |
| throw new InvalidParameterSpecException |
| ("Inappropriate parameter Specification"); |
| } |
| } |
| |
| protected byte[] engineGetEncoded() throws IOException { |
| DerOutputStream out = new DerOutputStream(); |
| DerOutputStream bytes = new DerOutputStream(); |
| |
| bytes.putInteger(this.p); |
| bytes.putInteger(this.g); |
| // Private-value length is OPTIONAL |
| if (this.l > 0) { |
| bytes.putInteger(this.l); |
| } |
| out.write(DerValue.tag_Sequence, bytes); |
| return out.toByteArray(); |
| } |
| |
| protected byte[] engineGetEncoded(String encodingMethod) |
| throws IOException { |
| return engineGetEncoded(); |
| } |
| |
| /* |
| * Returns a formatted string describing the parameters. |
| */ |
| protected String engineToString() { |
| String LINE_SEP = System.getProperty("line.separator"); |
| |
| StringBuilder sb |
| = new StringBuilder("SunJCE Diffie-Hellman Parameters:" |
| + LINE_SEP + "p:" + LINE_SEP |
| + Debug.toHexString(this.p) |
| + LINE_SEP + "g:" + LINE_SEP |
| + Debug.toHexString(this.g)); |
| if (this.l != 0) |
| sb.append(LINE_SEP + "l:" + LINE_SEP + " " + this.l); |
| return sb.toString(); |
| } |
| } |