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bouncecastle Encryption
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/**
 * Copyright 2018 Mike Hummel
 *
 * 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 de.mhus.osgi.crypt.bc;

import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.UUID;

import org.osgi.service.component.annotations.Component;
import de.mhus.lib.core.IProperties;
import de.mhus.lib.core.MApi;
import de.mhus.lib.core.MLog;
import de.mhus.lib.core.MProperties;
import de.mhus.lib.core.MString;
import de.mhus.lib.core.crypt.Blowfish;
import de.mhus.lib.core.crypt.MRandom;
import de.mhus.lib.core.crypt.pem.PemBlock;
import de.mhus.lib.core.crypt.pem.PemBlockModel;
import de.mhus.lib.core.crypt.pem.PemKey;
import de.mhus.lib.core.crypt.pem.PemKeyPair;
import de.mhus.lib.core.crypt.pem.PemPair;
import de.mhus.lib.core.crypt.pem.PemPriv;
import de.mhus.lib.core.crypt.pem.PemPub;
import de.mhus.lib.errors.MException;
import de.mhus.osgi.crypt.api.CryptApi;
import de.mhus.osgi.crypt.api.signer.SignerProvider;
import de.mhus.osgi.crypt.api.util.CryptUtil;

// http://bounce-com.s3.amazonaws.com/b93ede49-06e1-44dc-9caf-8ca7fe04896f/e084edee-e787-42b5-8b18-559fc8a09bad/solving-java-application-errors-in-production.original.pdf?x-amz-security-token=FQoDYXdzEL3%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaDKLUAR0ROzxuWIDf9yK3AwJ7WvPa5hYMUZW0crQu1EUfwn9lRqH1Cg8rJrrTJIU6Up00b%2Fnvo%2BeXVpmJT%2BGClrXs9BErDO1Q%2BJM7dqzwZFetvxkilYZ7LIFg8J0nOiA0mhKbkTAKpELzhxqzM3fq7JHbyQTSpgz5mH1Q178DB41UuwiqrVxSkrih5SimDgKt1WhXwTD3nY0kbCOio2WTtTmBbfx%2F6p47uOHJpo%2BMqpeVDzahNisFbyKxYnWTMXiC8JNXptFZEeWkV%2F5zchoXT3kDgZkqF%2FW4pE89%2FJgeP5bUVcH0Wkrnf2D2iHLvlehYTs060%2FC9Q2DwTfhwl6gDiQzrDVlDUbEL80pvOu1k8QQE3aEgmOyyhIa92iIO%2FbfWYG3WX1nuhi%2B9wbpTfgMc%2FHnZ7eq0O%2F7JwVubFYUxvtUizsolPfJ7E%2Bv3Hnj3zeahWnU0XglEOg5QequqWisq3pN6PUKzaAQaAW40r0nxMSi8kxk%2F6e527MRHEYdWyLv2GyYY%2F8vhpA3aINmemq%2B8Ndnu9eVJ6sMCqH7v0kZ5X5XGtb5Xz%2FWfEsz9HqvJBopMSqBYWqGQ0JUHU7G6DoWd86ip6A9vBYAoqsTMxAU%3D&AWSAccessKeyId=ASIAJUR7I5ODZ6DWSGEA&Expires=1486041245&Signature=ZGCLe2NXvRQyv5CTVW43tFQSbFQ%3D

@Component(property="signer=DSA-JCE") // SUNDSA
public class JavaDsaSigner extends MLog implements SignerProvider {

	private static String NAME = "DSA-JCE";
		
	@Override
	public PemBlock sign(PemPriv key, String text, String passphrase) throws MException {
		try {
			byte[] encKey = key.getBytesBlock();
			if (MString.isSet(passphrase))
				encKey = Blowfish.decrypt(encKey, passphrase);
			PKCS8EncodedKeySpec privKeySpec = new PKCS8EncodedKeySpec(encKey);
			KeyFactory keyFactory = KeyFactory.getInstance("DSA", "SUN");
			PrivateKey privKey = keyFactory.generatePrivate(privKeySpec);
			
			Signature dsa = Signature.getInstance("SHA1withDSA", "SUN"); 
			dsa.initSign(privKey);
			byte[] buffer = text.getBytes();
			dsa.update(buffer, 0, buffer.length);
			
			byte[] realSig = dsa.sign();
			
			PemBlockModel out = new PemBlockModel(PemBlock.BLOCK_SIGN, realSig);
			CryptUtil.prepareSignOut(key, out, getName());
			
			return out;
		} catch (Exception e) {
			throw new MException(e);
		}
	}

	@Override
	public boolean validate(PemPub key, String text, PemBlock sign) throws MException {
		try {
			byte[] encKey = key.getBytesBlock();
			X509EncodedKeySpec pubKeySpec = new X509EncodedKeySpec(encKey);
			KeyFactory keyFactory = KeyFactory.getInstance("DSA", "SUN");
			PublicKey pubKey = keyFactory.generatePublic(pubKeySpec);
			
			Signature sig = Signature.getInstance("SHA1withDSA", "SUN");
			sig.initVerify(pubKey);
			
			byte[] buffer = text.getBytes();
			sig.update(buffer, 0, buffer.length);

			byte[] sigToVerify = sign.getBytesBlock();
			return sig.verify(sigToVerify);
			
		} catch (Exception e) {
			throw new MException(e);
		}
	}

	@Override
	public String getName() {
		return NAME;
	}

	@Override
	public PemPair createKeys(IProperties properties) throws MException {
		try {
			if (properties == null) properties = new MProperties();
			int len = properties.getInt(CryptApi.LENGTH, 1024);
			KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA", "SUN");
			MRandom random = MApi.lookup(MRandom.class);
			keyGen.initialize(len, random.getSecureRandom());
			
			KeyPair    pair = keyGen.generateKeyPair();
			PrivateKey priv = pair.getPrivate();
			PublicKey  pub  = pair.getPublic();
			
			UUID privId = UUID.randomUUID();
			UUID pubId = UUID.randomUUID();
			
			byte[] privBytes = priv.getEncoded();
			String passphrase = properties.getString(CryptApi.PASSPHRASE, null);
			if (MString.isSet(passphrase))
				privBytes = Blowfish.encrypt(privBytes, passphrase);

			PemKey xpub  = new PemKey(PemBlock.BLOCK_PUB , pub.getEncoded(), false  )
					.set(PemBlock.METHOD, getName())
					.set(PemBlock.LENGTH, len)
					.set(PemBlock.FORMAT, pub.getFormat())
					.set(PemBlock.IDENT, pubId)
					.set(PemBlock.PRIV_ID, privId);

			PemKey xpriv = new PemKey(PemBlock.BLOCK_PRIV, privBytes, true )
					.set(PemBlock.METHOD, getName())
					.set(PemBlock.LENGTH, len)
					.set(PemBlock.FORMAT, priv.getFormat())
					.set(PemBlock.IDENT, privId)
					.set(PemBlock.PUB_ID, pubId);
			
			if (MString.isSet(passphrase))
				xpriv.set(PemBlock.ENCRYPTED, PemBlock.ENC_BLOWFISH);
			privBytes = null;
			return new PemKeyPair(xpriv, xpub);
			
		} catch (Exception e) {
			throw new MException(e);
		}
	}

}