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/*
 * =============================================================================
 * 
 *   Copyright (c) 2007-2010, The JASYPT team (http://www.jasypt.org)
 * 
 *   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 org.jasypt.salt;

import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import org.jasypt.exceptions.EncryptionInitializationException;

/**
 * 

* This implementation of {@link SaltGenerator} holds a secure random * generator which can be used for generating random salts for encryption * or digesting. *

*

* The algorithm used for random number generation can be configured at * instantiation time. If not, the default algorithm will be used. *

*

* This class is thread-safe. *

* * @since 1.2 * * @author Daniel Fernández * */ public class RandomSaltGenerator implements SaltGenerator { /** * The default algorithm to be used for secure random number * generation: set to SHA1PRNG. */ public static final String DEFAULT_SECURE_RANDOM_ALGORITHM = "SHA1PRNG"; private final SecureRandom random; /** * Creates a new instance of RandomSaltGenerator using the * default secure random number generation algorithm. */ public RandomSaltGenerator() { this(DEFAULT_SECURE_RANDOM_ALGORITHM); } /** * Creates a new instance of RandomSaltGenerator specifying a * secure random number generation algorithm. * * @since 1.5 * */ public RandomSaltGenerator(final String secureRandomAlgorithm) { super(); try { this.random = SecureRandom.getInstance(secureRandomAlgorithm); } catch (NoSuchAlgorithmException e) { throw new EncryptionInitializationException(e); } } /** * Generate a random salt of the specified length in bytes. * * @param lengthBytes length in bytes. * @return the generated salt. */ public byte[] generateSalt(final int lengthBytes) { final byte[] salt = new byte[lengthBytes]; synchronized (this.random) { this.random.nextBytes(salt); } return salt; } /** * This salt generator needs the salt to be included unencrypted in * encryption results, because of its being random. This method will always * return true. * * @return true */ public boolean includePlainSaltInEncryptionResults() { return true; } }




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