package org.apache.harmony.xnet.provider.jsse;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Implements the JDK MessageDigest interface using OpenSSL's EVP API.
*/
public class OpenSSLMessageDigestJDK extends MessageDigest {
/**
* 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 OpenSSLMessageDigestJDK instance for the given algorithm
* name.
*
* @param algorithm The name of the algorithm, e.g. "SHA1".
*
* @return The new OpenSSLMessageDigestJDK instance.
*
* @throws RuntimeException In case of problems.
*/
public static OpenSSLMessageDigestJDK getInstance(String algorithm) throws NoSuchAlgorithmException{
return new OpenSSLMessageDigestJDK(algorithm);
}
/**
* Creates a new OpenSSLMessageDigest instance for the given algorithm
* name.
*
* @param algorithm The name of the algorithm, e.g. "SHA1".
*/
private OpenSSLMessageDigestJDK(String algorithm) throws NoSuchAlgorithmException {
super(algorithm);
// We don't support MD2 anymore. This needs to also check for aliases
// and OIDs.
if ("MD2".equalsIgnoreCase(algorithm) || "1.2.840.113549.2.2"
.equalsIgnoreCase(algorithm)) {
throw new NoSuchAlgorithmException(algorithm);
}
ctx = NativeCrypto.EVP_new();
try {
NativeCrypto.EVP_DigestInit(ctx, getAlgorithm().replace("-", "").toLowerCase());
} catch (Exception ex) {
throw new NoSuchAlgorithmException(ex.getMessage() + " (" + algorithm + ")");
}
}
@Override
protected byte[] engineDigest() {
byte[] result = new byte[NativeCrypto.EVP_DigestSize(ctx)];
NativeCrypto.EVP_DigestFinal(ctx, result, 0);
engineReset();
return result;
}
@Override
protected void engineReset() {
NativeCrypto.EVP_DigestInit(ctx, getAlgorithm().replace("-", "").toLowerCase());
}
@Override
protected int engineGetDigestLength() {
return NativeCrypto.EVP_DigestSize(ctx);
}
@Override
protected void engineUpdate(byte input) {
singleByte[0] = input;
engineUpdate(singleByte, 0, 1);
}
@Override
protected void engineUpdate(byte[] input, int offset, int len) {
NativeCrypto.EVP_DigestUpdate(ctx, input, offset, len);
}
@Override
protected void finalize() throws Throwable {
super.finalize();
NativeCrypto.EVP_free(ctx);
}
static public class MD5 extends OpenSSLMessageDigestJDK {
public MD5() throws NoSuchAlgorithmException {
super("MD5");
}
}
static public class SHA1 extends OpenSSLMessageDigestJDK {
public SHA1() throws NoSuchAlgorithmException {
super("SHA-1");
}
}
static public class SHA224 extends OpenSSLMessageDigestJDK {
public SHA224() throws NoSuchAlgorithmException {
super("SHA-224");
}
}
static public class SHA256 extends OpenSSLMessageDigestJDK {
public SHA256() throws NoSuchAlgorithmException {
super("SHA-256");
}
}
}