OpenSSLMessageDigestJDK.java revision 4155a2498a57fb09e92815f8993a70c216ddc5ec
1/* 2 * Copyright (C) 2008 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.apache.harmony.xnet.provider.jsse; 18 19import java.security.MessageDigest; 20import java.security.NoSuchAlgorithmException; 21 22/** 23 * Implements the JDK MessageDigest interface using OpenSSL's EVP API. 24 */ 25public class OpenSSLMessageDigestJDK extends MessageDigest implements Cloneable { 26 27 /** 28 * Holds a pointer to the native message digest context. 29 */ 30 private int ctx; 31 32 /** 33 * Holds the EVP_MD for the hashing algorithm, e.g. EVP_get_digestbyname("sha1"); 34 */ 35 private final int evp_md; 36 37 /** 38 * Holds the output size of the message digest. 39 */ 40 private final int size; 41 42 /** 43 * Holds a dummy buffer for writing single bytes to the digest. 44 */ 45 private final byte[] singleByte = new byte[1]; 46 47 /** 48 * Creates a new OpenSSLMessageDigest instance for the given algorithm 49 * name. 50 */ 51 private OpenSSLMessageDigestJDK(String algorithm, int evp_md, int size) 52 throws NoSuchAlgorithmException { 53 super(algorithm); 54 this.evp_md = evp_md; 55 this.size = size; 56 } 57 58 @Override 59 protected void engineReset() { 60 free(); 61 } 62 63 @Override 64 protected int engineGetDigestLength() { 65 return size; 66 } 67 68 @Override 69 protected void engineUpdate(byte input) { 70 singleByte[0] = input; 71 engineUpdate(singleByte, 0, 1); 72 } 73 74 @Override 75 protected void engineUpdate(byte[] input, int offset, int len) { 76 NativeCrypto.EVP_DigestUpdate(getCtx(), input, offset, len); 77 } 78 79 @Override 80 protected byte[] engineDigest() { 81 byte[] result = new byte[size]; 82 NativeCrypto.EVP_DigestFinal(getCtx(), result, 0); 83 ctx = 0; // EVP_DigestFinal frees the context as a side effect 84 return result; 85 } 86 87 public Object clone() throws CloneNotSupportedException { 88 OpenSSLMessageDigestJDK d = (OpenSSLMessageDigestJDK) super.clone(); 89 d.ctx = NativeCrypto.EVP_MD_CTX_copy(getCtx()); 90 return d; 91 } 92 93 private int getCtx() { 94 if (ctx == 0) { 95 ctx = NativeCrypto.EVP_DigestInit(evp_md); 96 } 97 return ctx; 98 } 99 100 private void free() { 101 if (ctx != 0) { 102 NativeCrypto.EVP_MD_CTX_destroy(ctx); 103 ctx = 0; 104 } 105 } 106 107 @Override protected void finalize() throws Throwable { 108 try { 109 free(); 110 } finally { 111 super.finalize(); 112 } 113 } 114 115 public static class MD5 extends OpenSSLMessageDigestJDK { 116 private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("md5"); 117 private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD); 118 public MD5() throws NoSuchAlgorithmException { 119 super("MD5",EVP_MD, SIZE); 120 } 121 } 122 123 public static class SHA1 extends OpenSSLMessageDigestJDK { 124 private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("sha1"); 125 private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD); 126 public SHA1() throws NoSuchAlgorithmException { 127 super("SHA-1", EVP_MD, SIZE); 128 } 129 } 130 131 public static class SHA256 extends OpenSSLMessageDigestJDK { 132 private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("sha256"); 133 private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD); 134 public SHA256() throws NoSuchAlgorithmException { 135 super("SHA-256", EVP_MD, SIZE); 136 } 137 } 138 139 public static class SHA384 extends OpenSSLMessageDigestJDK { 140 private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("sha384"); 141 private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD); 142 public SHA384() throws NoSuchAlgorithmException { 143 super("SHA-384", EVP_MD, SIZE); 144 } 145 } 146 147 public static class SHA512 extends OpenSSLMessageDigestJDK { 148 private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("sha512"); 149 private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD); 150 public SHA512() throws NoSuchAlgorithmException { 151 super("SHA-512", EVP_MD, SIZE); 152 } 153 } 154} 155