Class ToolDES

security/src/main/java/pro/tools/security/ToolDES.java:22–146

DES安全编码组件 @author SeanDragon

 * @author SeanDragon
 */
public final class ToolDES {

    private ToolDES() {
        throw new UnsupportedOperationException("我是工具类，别初始化我。。。");
    }

    /**
     * 密钥算法 <br>
     * Java 6 只支持56bit密钥 <br>
     * Bouncy Castle 支持64bit密钥
     */
    public static final String KEY_ALGORITHM = "DES";

    /**
     * 加密/解密算法 / 工作模式 / 填充方式
     */
    public static final String CIPHER_ALGORITHM = "DES/ECB/PKCS5PADDING";

    /**
     * 转换密钥
     *
     * @param key
     *         二进制密钥
     *
     * @return Key 密钥
     *
     * @throws Exception
     */
    private static Key toKey(byte[] key) throws InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException {

        // 实例化DES密钥材料
        DESKeySpec dks = new DESKeySpec(key);

        // 实例化秘密密钥工厂
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(KEY_ALGORITHM);

        // 生成秘密密钥
        SecretKey secretKey = keyFactory.generateSecret(dks);

        return secretKey;
    }

    /**
     * 解密
     *
     * @param data
     *         待解密数据
     * @param key
     *         密钥
     *
     * @return byte[] 解密数据
     *
     * @throws Exception
     */
    public static byte[] decrypt(byte[] data, byte[] key) throws NoSuchAlgorithmException, InvalidKeyException, InvalidKeySpecException, NoSuchPaddingException, BadPaddingException, IllegalBlockSizeException {

        // 还原密钥
        Key k = toKey(key);