ASC加密解密（筆記）

涉及變量：   // 加密密碼：key==>springblade                       //content==>需要加密的內容
                       //password==>加密密碼                                  

  二：AES加密 

     public static String encrypt(String str) {
		          return HexKit.binary2Hex(encryptByte(str, key));
	  }	

	 private static byte[] encryptByte(String content, String password) {
		try {
			KeyGenerator kgen = KeyGenerator.getInstance("AES");
			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
			secureRandom.setSeed(password.getBytes());
			kgen.init(128, secureRandom);
			SecretKey secretKey = kgen.generateKey();
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
			Cipher cipher = Cipher.getInstance("AES");// 創建密碼器
			byte[] byteContent = content.getBytes("utf-8");
			cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
			byte[] result = cipher.doFinal(byteContent);
			return result;
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			e.printStackTrace();
		} catch (BadPaddingException e) {
			e.printStackTrace();
		}
		return null;
	}

三：ASC解密

       public static String decrypt(String str) {
		    // 16進制轉2進制
		    byte[] decryptFrom = HexKit.hex2Byte(str);
		    // 根據byte進行解碼
		    byte[] decryptResult = decryptByte(decryptFrom, key);
		    return new String(decryptResult);
	   }
 
        private static byte[] decryptByte(byte[] content, String password) {
		try {
			KeyGenerator kgen = KeyGenerator.getInstance("AES");
			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
			secureRandom.setSeed(password.getBytes());
			kgen.init(128, secureRandom);
			SecretKey secretKey = kgen.generateKey();
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
			Cipher cipher = Cipher.getInstance("AES");// 創建密碼器
			cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
			byte[] result = cipher.doFinal(content);
			return 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();
		}
		return null;
	}   

 demo：鏈接：https://pan.baidu.com/s/1YvfQum7fhh-Gr_TCEJq1qw                    提取碼：3oh4