附录B JAVA版DES加密/解密

/* DES解密 */
public static String decrypt(String message, String key) throws Exception {

    byte[] bytesrc = Base64.decode(message);
    //convertHexString(message);
    Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
    DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
    IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
    cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
    byte[] retByte = cipher.doFinal(bytesrc);
    return new String(retByte);
}

/* DES加密 */
public static byte[] encrypt(String message, String key) throws Exception {
    Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
    DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
    IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
    cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
    return cipher.doFinal(message.getBytes("UTF-8"));
}