将 Java的 AES 加解密算法转换为Ruby

[狼王_]

/**
	 * AES 解密 以String密文输入,String明文输出
	 * 
	 * @param strMi
	 *            加密后转换为base64格式的字符串
	 * @param strKey
	 *            加密用的Key
	 * @return 解密的字符串 首先base64解密，而后在用key解密
	 */
	public static String getDecString(String strMi, String strKey) {

		try {
			SecretKey secretKey = getKey(strKey);
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
			Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");// 创建密码器
			cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
			byte[] bytes = Base64.decode(strMi);
			byte[] result = cipher.doFinal(bytes);
			String strMing = new String(result, "utf-8");

			return strMing; // 解密
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;

	}

	/**
	 * 
	 * @param strKey  密钥
	 * @return 安全密钥
	 * 指定具体产生key的算法，跨操作系统产生 SecretKey，如果不指定，各种操作系统产生的安全key不一致。
	 */
	public static SecretKey getKey(String strKey) {
		try {
			KeyGenerator _generator = KeyGenerator.getInstance("AES");
			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
			secureRandom.setSeed(strKey.getBytes());
			_generator.init(128, secureRandom);
			return _generator.generateKey();
		} catch (Exception e) {
			throw new RuntimeException("初始化密钥出现异常");
		}
	}

	/**
	 * 加密以String明文输入,String密文输出
	 * 
	 * @param strContent
	 *            待加密字符串
	 * @param strKey
	 *            加密用的Key
	 * @return 加密后转换为base64格式字符串
	 */
	public static String getEncString(String strContent, String strKey) {
		String strMi = "";
		try {
			SecretKey secretKey = getKey(strKey);
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
			Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");// 创建密码器
			byte[] byteContent = strContent.getBytes("utf-8");
			cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
			byte[] result = cipher.doFinal(byteContent);

			strMi = Base64.encode(result);

		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			e.printStackTrace();
		} catch (InvalidKeyException e) {
	                e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			e.printStackTrace();
		} catch (BadPaddingException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return strMi; // 加密
	}