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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
 */

package org.solovyev.common.security;

import org.solovyev.common.Bytes;

import javax.annotation.Nonnull;
import java.security.MessageDigest;

/**
 * User: serso
 * Date: 8/20/12
 * Time: 8:17 PM
 */
class ByteArrayHashProvider implements HashProvider {

	@Nonnull
	private final String hashAlgorithm;

	@Nonnull
	private final String provider;

	private ByteArrayHashProvider(@Nonnull String hashAlgorithm, @Nonnull String provider) {
		this.hashAlgorithm = hashAlgorithm;
		this.provider = provider;
	}

	@Nonnull
	static HashProvider newInstance(@Nonnull String hashAlgorithm, @Nonnull String provider) {
		return new ByteArrayHashProvider(hashAlgorithm, provider);
	}

	@Override
	@Nonnull
	public byte[] getHash(@Nonnull byte[] object, @Nonnull byte[] salt) throws CiphererException {
		try {
			final MessageDigest md = MessageDigest.getInstance(hashAlgorithm, provider);
			return md.digest(Bytes.concat(object, salt));
		} catch (Exception e) {
			throw new CiphererException("Unable to get hash due to some errors!", e);
		}
	}

}