/*
* Copyright (C) 2010 Ken Ellinwood.
*
* 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 kellinwood.security.zipsigner;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.PrivateKey;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
@SuppressWarnings("restriction")
public class ZipSignature {
byte[] beforeAlgorithmIdBytes = { 0x30, 0x21 };
// byte[] algorithmIdBytes;
// algorithmIdBytes = sun.security.x509.AlgorithmId.get("SHA1").encode();
byte[] algorithmIdBytes = {0x30, 0x09, 0x06, 0x05, 0x2B, 0x0E, 0x03, 0x02, 0x1A, 0x05, 0x00 };
byte[] afterAlgorithmIdBytes = { 0x04, 0x14 };
Cipher cipher;
MessageDigest md;
public ZipSignature() throws IOException, GeneralSecurityException
{
md = MessageDigest.getInstance("SHA1");
cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
}
public void initSign( PrivateKey privateKey) throws InvalidKeyException
{
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
}
public void update( byte[] data) {
md.update( data);
}
public void update( byte[] data, int offset, int count) {
md.update( data, offset, count);
}
public byte[] sign() throws BadPaddingException, IllegalBlockSizeException
{
cipher.update( beforeAlgorithmIdBytes);
cipher.update( algorithmIdBytes);
cipher.update( afterAlgorithmIdBytes);
cipher.update( md.digest());
return cipher.doFinal();
}
}