| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.bouncycastle.crypto.digests; |
| |
| import org.apache.harmony.xnet.provider.jsse.NativeCrypto; |
| import org.bouncycastle.crypto.ExtendedDigest; |
| |
| /** |
| * Implements the BouncyCastle Digest interface using OpenSSL's EVP API. |
| */ |
| public class OpenSSLDigest implements ExtendedDigest { |
| |
| /** |
| * Holds the standard name of the hashing algorithm, e.g. "SHA-1"; |
| */ |
| private final String algorithm; |
| |
| /** |
| * Holds the EVP_MD for the hashing algorithm, e.g. EVP_get_digestbyname("sha1"); |
| */ |
| private final int evp_md; |
| |
| /** |
| * Holds the output size of the message digest. |
| */ |
| private final int size; |
| |
| /** |
| * Holds the block size of the message digest. |
| */ |
| private final int blockSize; |
| |
| /** |
| * Holds a pointer to the native message digest context. It is |
| * lazily initialized to avoid having to reallocate on reset when |
| * its unlikely to be reused. |
| */ |
| private int ctx; |
| |
| /** |
| * Holds a dummy buffer for writing single bytes to the digest. |
| */ |
| private final byte[] singleByte = new byte[1]; |
| |
| /** |
| * Creates a new OpenSSLMessageDigest instance for the given algorithm |
| * name. |
| */ |
| private OpenSSLDigest(String algorithm, int evp_md, int size, int blockSize) { |
| this.algorithm = algorithm; |
| this.evp_md = evp_md; |
| this.size = size; |
| this.blockSize = blockSize; |
| } |
| |
| public String getAlgorithmName() { |
| return algorithm; |
| } |
| |
| public int getDigestSize() { |
| return size; |
| } |
| |
| public int getByteLength() { |
| return blockSize; |
| } |
| |
| public void reset() { |
| free(); |
| } |
| |
| public void update(byte in) { |
| singleByte[0] = in; |
| update(singleByte, 0, 1); |
| } |
| |
| public void update(byte[] in, int inOff, int len) { |
| NativeCrypto.EVP_DigestUpdate(getCtx(), in, inOff, len); |
| } |
| |
| public int doFinal(byte[] out, int outOff) { |
| int i = NativeCrypto.EVP_DigestFinal(getCtx(), out, outOff); |
| ctx = 0; // EVP_DigestFinal frees the context as a side effect |
| reset(); |
| return i; |
| } |
| |
| private int getCtx() { |
| if (ctx == 0) { |
| ctx = NativeCrypto.EVP_DigestInit(evp_md); |
| } |
| return ctx; |
| } |
| |
| private void free() { |
| if (ctx != 0) { |
| NativeCrypto.EVP_MD_CTX_destroy(ctx); |
| ctx = 0; |
| } |
| } |
| |
| @Override |
| protected void finalize() throws Throwable { |
| try { |
| free(); |
| } finally { |
| super.finalize(); |
| } |
| } |
| |
| public static class MD5 extends OpenSSLDigest { |
| private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("md5"); |
| private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD); |
| private static final int BLOCK_SIZE = NativeCrypto.EVP_MD_block_size(EVP_MD); |
| public MD5() { super("MD5", EVP_MD, SIZE, BLOCK_SIZE); } |
| } |
| |
| public static class SHA1 extends OpenSSLDigest { |
| private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("sha1"); |
| private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD); |
| private static final int BLOCK_SIZE = NativeCrypto.EVP_MD_block_size(EVP_MD); |
| public SHA1() { super("SHA-1", EVP_MD, SIZE, BLOCK_SIZE); } |
| } |
| |
| public static class SHA256 extends OpenSSLDigest { |
| private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("sha256"); |
| private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD); |
| private static final int BLOCK_SIZE = NativeCrypto.EVP_MD_block_size(EVP_MD); |
| public SHA256() { super("SHA-256", EVP_MD, SIZE, BLOCK_SIZE); } |
| } |
| |
| public static class SHA384 extends OpenSSLDigest { |
| private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("sha384"); |
| private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD); |
| private static final int BLOCK_SIZE = NativeCrypto.EVP_MD_block_size(EVP_MD); |
| public SHA384() { super("SHA-384", EVP_MD, SIZE, BLOCK_SIZE); } |
| } |
| |
| public static class SHA512 extends OpenSSLDigest { |
| private static final int EVP_MD = NativeCrypto.EVP_get_digestbyname("sha512"); |
| private static final int SIZE = NativeCrypto.EVP_MD_size(EVP_MD); |
| private static final int BLOCK_SIZE = NativeCrypto.EVP_MD_block_size(EVP_MD); |
| public SHA512() { super("SHA-512", EVP_MD, SIZE, BLOCK_SIZE); } |
| } |
| } |