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/*
 * Copyright 2013 serso aka se.solovyev
 *
 * 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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Contact details
 *
 * Email: [email protected]
 * Site:  http://se.solovyev.org/java/jcl
 */

package org.solovyev.common.security;

import org.solovyev.common.Bytes;
import org.solovyev.common.Charsets;

import javax.annotation.Nonnull;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

public class Sha1HashSecretKeyProvider implements SecretKeyProvider {

	@Nonnull
	private static final SecretKeyProvider aes = newInstance(Security.CIPHERER_ALGORITHM_AES, 16);

	@Nonnull
	private static final SecretKeyProvider des = newInstance(Security.CIPHERER_ALGORITHM_DES, 16);

	private final int saltLength;

	@Nonnull
	private final String ciphererAlgorithm;

	private Sha1HashSecretKeyProvider(@Nonnull String ciphererAlgorithm, int saltLength) {
		this.ciphererAlgorithm = ciphererAlgorithm;
		this.saltLength = saltLength;
	}

	@Nonnull
	public static SecretKeyProvider newAesInstance() {
		return aes;
	}

	@Nonnull
	public static SecretKeyProvider newDesInstance() {
		return des;
	}

	@Nonnull
	public static Sha1HashSecretKeyProvider newInstance(@Nonnull String ciphererAlgorithm, int saltLength) {
		return new Sha1HashSecretKeyProvider(ciphererAlgorithm, saltLength);
	}

	@Nonnull
	@Override
	public SecretKey getSecretKey(@Nonnull String secret, @Nonnull byte[] salt) throws CiphererException {
		final String secretKey = secret + Bytes.toHex(salt);

		try {
			final MessageDigest sha = MessageDigest.getInstance("SHA-1");
			byte[] secretKeyHash = sha.digest(secretKey.getBytes(Charsets.UTF_8));
			secretKeyHash = Arrays.copyOf(secretKeyHash, saltLength);

			return new SecretKeySpec(secretKeyHash, ciphererAlgorithm);
		} catch (NoSuchAlgorithmException e) {
			throw new CiphererException(e);
		}
	}
}