io.manasobi.utils.CryptoUtils.java Source code

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Here is the source code for io.manasobi.utils.CryptoUtils.java

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/*
 * Copyright 2002-2012 the original author or authors.
 *
 * 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 io.manasobi.utils;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.SecretKeySpec;

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

import io.manasobi.exception.CryptoUtilsException;

/**
 * DES?? ? /   Utils.
 * 
 * @author manasobi
 * @since 1.0.0
 */
public final class CryptoUtils {

    private CryptoUtils() {
    }

    /** ? ?  -  TripleDES */
    private static final String ALGORITHM = "DESede";

    /**
     * ?   ?. ??  ?  ??  ?  ?.
     *
     * @return ?? ??  Hex ?  
     */
    public static String generateHexDESKey() {

        byte[] rawKey = null;

        try {

            KeyGenerator keyGenerator = KeyGenerator.getInstance(ALGORITHM);

            SecretKey secretKey = keyGenerator.generateKey();

            SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance(ALGORITHM);

            DESedeKeySpec desEdeSpec = (DESedeKeySpec) secretKeyFactory.getKeySpec(secretKey,
                    javax.crypto.spec.DESedeKeySpec.class);

            rawKey = desEdeSpec.getKey();

        } catch (Exception e) {

            throw new CryptoUtilsException(e.getMessage());
        }

        return new String(Hex.encodeHex(rawKey));
    }

    /**
     *  .
     *
     * @param keyHex generateHexKey ? ? ?? Hex ? ? 
     * @param data    ?? byte 
     * 
     * @return  ? ??
     */
    public static byte[] encryptByDES(String keyHex, byte[] data) {

        SecretKey key = getSecretDESKeyFromHex(keyHex);

        byte[] encryptedData = null;

        try {

            Cipher cipher = Cipher.getInstance(ALGORITHM);

            cipher.init(Cipher.ENCRYPT_MODE, key);

            encryptedData = cipher.doFinal(data);

        } catch (Exception e) {

            throw new CryptoUtilsException(e.getMessage());
        }

        return encryptedData;
    }

    /**
     * ? ??    ?   ?  .
     *
     * @param keyHex   generateHexKey ? ? ?? Hex ? ? 
     * @param data      ?? ?
     * @param encoding ? ?
     * 
     * @return  ? ?? ?  
     */
    public static String encryptByDES(String keyHex, String data, String encoding) {

        String encryptedString = null;

        try {

            byte[] encryptedData = encryptByDES(keyHex, data.getBytes(encoding));

            encryptedString = new String(Hex.encodeHex(encryptedData));

        } catch (Exception e) {

            throw new CryptoUtilsException(e.getMessage());
        }

        return encryptedString;
    }

    /**
     *  .
     *
     * @param keyHex generateHexKey ? ? ?? Hex ? ? 
     * @param data    ? ?
     *             
     * @return ? ?? byte 
     */
    public static byte[] decryptByDES(String keyHex, byte[] data) {

        SecretKey key = getSecretDESKeyFromHex(keyHex);

        byte[] decryptedData = null;

        try {

            Cipher cipher = Cipher.getInstance(ALGORITHM);

            cipher.init(Cipher.DECRYPT_MODE, key);

            decryptedData = cipher.doFinal(data);

        } catch (Exception e) {

            throw new CryptoUtilsException(e.getMessage());
        }

        return decryptedData;
    }

    /**
     * ? ??  , ? ?? .
     *
     * @param keyHex   generateHexKey ? ? ?? Hex ? ? 
     * @param data      ? ?
     * @param encoding ? ?
     * 
     * @return ? ?
     */
    public static String decryptByDES(String keyHex, String data, String encoding) {

        String decryptedString = null;
        try {

            byte[] unhexedData = Hex.decodeHex(data.toCharArray());

            byte[] decryptedData = decryptByDES(keyHex, unhexedData);

            decryptedString = new String(decryptedData, encoding);

        } catch (Exception e) {

            throw new CryptoUtilsException(e.getMessage());
        }

        return decryptedString;
    }

    /**
     * hex ?? ? SecretKey ? ?.
     *
     * @param keyHex generateHexKey ? ? ?? Hex ? ? 
     *       
     * @return ?? SecretKey ?
     */
    private static SecretKey getSecretDESKeyFromHex(String keyHex) {

        SecretKey key = null;

        try {

            byte[] keyBytes = Hex.decodeHex(keyHex.toCharArray());

            key = new SecretKeySpec(keyBytes, ALGORITHM);

        } catch (Exception e) {

            throw new CryptoUtilsException(e.getMessage());
        }

        return key;
    }

}