1/* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package org.conscrypt; 18 19import java.math.BigInteger; 20import java.security.InvalidAlgorithmParameterException; 21import java.security.KeyPair; 22import java.security.KeyPairGeneratorSpi; 23import java.security.SecureRandom; 24import java.security.spec.AlgorithmParameterSpec; 25import java.security.spec.DSAParameterSpec; 26 27public class OpenSSLDSAKeyPairGenerator extends KeyPairGeneratorSpi { 28 29 private int primeBits = 1024; 30 31 private SecureRandom random = null; 32 33 private byte[] g; 34 35 private byte[] p; 36 37 private byte[] q; 38 39 @Override 40 public KeyPair generateKeyPair() { 41 final byte[] seed; 42 if (random == null) { 43 seed = null; 44 } else { 45 seed = new byte[20]; 46 random.nextBytes(seed); 47 } 48 49 final OpenSSLKey key = new OpenSSLKey(NativeCrypto.DSA_generate_key(primeBits, seed, g, p, 50 q)); 51 52 final OpenSSLDSAPrivateKey privKey = new OpenSSLDSAPrivateKey(key); 53 final OpenSSLDSAPublicKey pubKey = new OpenSSLDSAPublicKey(key); 54 55 return new KeyPair(pubKey, privKey); 56 } 57 58 @Override 59 public void initialize(int keysize, SecureRandom random) { 60 primeBits = keysize; 61 this.random = random; 62 } 63 64 @Override 65 public void initialize(AlgorithmParameterSpec params, SecureRandom random) 66 throws InvalidAlgorithmParameterException { 67 this.random = random; 68 69 if (params instanceof DSAParameterSpec) { 70 DSAParameterSpec dsaParams = (DSAParameterSpec) params; 71 72 BigInteger gInt = dsaParams.getG(); 73 if (gInt != null) { 74 g = gInt.toByteArray(); 75 } 76 77 BigInteger pInt = dsaParams.getP(); 78 if (pInt != null) { 79 p = pInt.toByteArray(); 80 } 81 82 BigInteger qInt = dsaParams.getQ(); 83 if (qInt != null) { 84 q = qInt.toByteArray(); 85 } 86 } else if (params != null) { 87 throw new InvalidAlgorithmParameterException("Params must be DSAParameterSpec"); 88 } 89 } 90} 91