fr.cph.stock.security.Security.java Source code

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Here is the source code for fr.cph.stock.security.Security.java

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/**
 * Copyright 2013 Carl-Philipp Harmant
 *
 * 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 fr.cph.stock.security;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import org.apache.commons.codec.binary.Hex;

/**
 * Class that takes care of encoding password and generate salt
 * 
 * @author Carl-Philipp Harmant
 * 
 */
public final class Security {

    /**
     * Constructor
     */
    private Security() {
    }

    /**
     * Encode to sha256 the user password
     * 
     * @param str
     *            the password to encode
     * @return an encoded string
     * @throws NoSuchAlgorithmException
     *             the NoSuchAlgorithmException
     * @throws UnsupportedEncodingException
     *             the UnsupportedEncodingException
     */
    public static String encodeToSha256(final String str)
            throws NoSuchAlgorithmException, UnsupportedEncodingException {
        MessageDigest digest = MessageDigest.getInstance("SHA-256");
        byte[] hash = digest.digest(str.getBytes("UTF-8"));
        String encoded = Hex.encodeHexString(hash);
        return encoded;
    }

    /**
     * Generate a salt, a random key, en encrypt it
     * 
     * @return a key encrypted
     * @throws NoSuchAlgorithmException
     *             the NoSuchAlgorithmException
     * @throws UnsupportedEncodingException
     *             the UnsupportedEncodingException
     */
    public static String generateSalt() throws NoSuchAlgorithmException, UnsupportedEncodingException {
        SecureRandom random = new SecureRandom();
        return Security.encodeToSha256(random.toString());
    }
}