Java Cipher类解密|笔记

Posted 2022-12-07 aikongmeng

Cipher类为加密和解密提供密码功能
Cipher类可以构建多种加密算法，如DES、AES、Blowfish对称加密算法，以及RSA、DSA、DH等多种非对称加密算法
Cipher类是一个引擎类，它需要通过getInstance()工厂方法来实例化对象。

实例：

public static String decrypt(String base64Str, String key) throws Exception 
        byte[] bytes = key.getBytes(StandardCharsets.UTF_8);
        //根据指定的字节数组构建密钥
        SecretKey secretKey = new SecretKeySpec(bytes, "AES");
        //get cipher Instance
        Cipher instance = Cipher.getInstance("AES/CBC/NoPadding");
        //用密钥和一组算法参数初始化此Cipher对象
        instance.init(2, secretKey, new IvParameterSpec(bytes));
        //解密
        byte[] doFinal = instance.doFinal(Base64.getDecoder().decode(base64Str));
        return new String(doFinal, StandardCharsets.UTF_8);
    

public static void main(String []args)  
       String bs64 = "sFoOJcpVPXmeWr+WAjUmsZA/CJPPsAAGHVrGW21aPGGJxnh7P6pxXeyAKpXnWTeVRkLSjufEfSHmZXiKj9xgfjBIQK7Te4OTy+Yn+S7t7vrsA+DJm6tfWJ3jhzAwfttBmHkmfYgE87HOfXJkdg96BDI21++NqcMKBjQp4gA9iBfo/Ac1L723OpftJRXjP5W857q4S0TvBMwMKE3VxlWHo8qa0NuTt4KP4V9nqaqv8wB0EEzfH7W5Jp7y8l+X6VgZr3FVJPOfn1hW3RieYE9P+DQkN4XH6dvPNiO7Uyk3MZ+VEupkGCUFIRoe4YKQsOWipcnFD/uytWiftT22potLlpR1f31WrYb20c8aBAveFg=";
       String result=  decrypt(bs64,"awdtif20190619ti");
       System.out.println(result);

实例结果：

vmess://eyJhZGQiOiI2Ny4yMS43MC4xNjgiLCJhaWQiOiI2NCIsImhvc3QiOiJ3d3cuMzAzNzk5MzkueHl6IiwiaWQiOiI2ZTM3ZGZkMy01MzRkLTQ0ZjItODI4ZC0xNmU3YTljMGJmYjIiLCJuZXQiOiJ3cyIsInBhdGgiOiJcL2Zvb3RlcnMiLCJwb3J0Ijo0NDMsInBzIjoxMzMsInRscyI6InRscyIsInR5cGUiOiJkdGxzIiwidiI6IjIifQ==

参考文献

梁栋. Java加密与解密的艺术