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/*
* 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 long 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 long 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, long 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 long 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 long 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 long 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 long 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 long 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 long 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); }
}
}
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