de.hybris.platform.b2b.punchout.services.impl.AsymmetricManager.java Source code

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Here is the source code for de.hybris.platform.b2b.punchout.services.impl.AsymmetricManager.java

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/*
 * [y] hybris Platform
 *
 * Copyright (c) 2000-2013 hybris AG
 * All rights reserved.
 *
 * This software is the confidential and proprietary information of hybris
 * ("Confidential Information"). You shall not disclose such Confidential
 * Information and shall use it only in accordance with the terms of the
 * license agreement you entered into with hybris.
 */
package de.hybris.platform.b2b.punchout.services.impl;

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

import org.apache.commons.codec.binary.Hex;
import org.apache.log4j.Logger;

/**
 * Utility class used for asymmetric encryption.
 */
public class AsymmetricManager {
    private static final String ALGORITHM = "SHA-256";
    private static final String CHAR_SET = "UTF-8";
    private static final int SALT_LEN = 16;
    private static final Logger LOG = Logger.getLogger(AsymmetricManager.class);

    /**
     * Generates a hash using asymmetric encryption.
     * 
     * @param unsecureText
     *           The text to be hashed.
     * @param salt
     *           The salt used to defend against dictionary and rainbow table attacks.
     * @return The hash.
     */
    public static String getHash(final String unsecureText, final String salt) {
        try {
            final MessageDigest digest = MessageDigest.getInstance(ALGORITHM);
            digest.update(unsecureText.getBytes(CHAR_SET));
            digest.update(salt.getBytes(CHAR_SET));
            final byte[] byteData = digest.digest();

            //convert the byte to hex format method 1
            final StringBuffer sb = new StringBuffer();
            for (int i = 0; i < byteData.length; i++) {
                sb.append(Integer.toString((byteData[i] & 0xff) + 0x100, 16).substring(1));
            }

            return sb.toString();
        } catch (NoSuchAlgorithmException | UnsupportedEncodingException e) {
            // should never happen
            LOG.error("System was unable to generate the hash.", e);
        }
        return null;
    }

    /**
     * Generates a random salt.
     * 
     * @return The salt.
     */
    public static String getSalt() {
        final byte[] salt = new byte[SALT_LEN];
        final SecureRandom rnd = new SecureRandom();
        rnd.nextBytes(salt);
        return Hex.encodeHexString(salt);
    }
}