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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 String algorithm;
/**
* Holds the OpenSSL name of the hashing algorithm, e.g. "sha1";
*/
private String openssl;
/**
* Holds a pointer to the native message digest context.
*/
private int ctx;
/**
* Holds a dummy buffer for writing single bytes to the digest.
*/
private byte[] singleByte = new byte[1];
/**
* Creates a new OpenSSLMessageDigest instance for the given algorithm
* name.
*
* @param algorithm The standard name of the algorithm, e.g. "SHA-1".
* @param algorithm The name of the openssl algorithm, e.g. "sha1".
*/
private OpenSSLDigest(String algorithm, String openssl) {
this.algorithm = algorithm;
ctx = NativeCrypto.EVP_MD_CTX_create();
try {
NativeCrypto.EVP_DigestInit(ctx, openssl);
} catch (Exception ex) {
throw new RuntimeException(ex.getMessage() + " (" + algorithm + ")");
}
}
public int doFinal(byte[] out, int outOff) {
int i = NativeCrypto.EVP_DigestFinal(ctx, out, outOff);
reset();
return i;
}
public String getAlgorithmName() {
return algorithm;
}
public int getDigestSize() {
return NativeCrypto.EVP_MD_CTX_size(ctx);
}
public int getByteLength() {
return NativeCrypto.EVP_MD_CTX_block_size(ctx);
}
public void reset() {
NativeCrypto.EVP_DigestInit(ctx, openssl);
}
public void update(byte in) {
singleByte[0] = in;
NativeCrypto.EVP_DigestUpdate(ctx, singleByte, 0, 1);
}
public void update(byte[] in, int inOff, int len) {
NativeCrypto.EVP_DigestUpdate(ctx, in, inOff, len);
}
@Override
protected void finalize() throws Throwable {
super.finalize();
NativeCrypto.EVP_MD_CTX_destroy(ctx);
ctx = 0;
}
public static class MD5 extends OpenSSLDigest {
public MD5() { super("MD5", "md5"); }
}
public static class SHA1 extends OpenSSLDigest {
public SHA1() { super("SHA-1", "sha1"); }
}
public static class SHA256 extends OpenSSLDigest {
public SHA256() { super("SHA-256", "sha256"); }
}
public static class SHA384 extends OpenSSLDigest {
public SHA384() { super("SHA-384", "sha384"); }
}
public static class SHA512 extends OpenSSLDigest {
public SHA512() { super("SHA-512", "sha512"); }
}
}
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