非对称可逆加密RSA

加密key与解密key不是一个,而是一对

加密key与解密key是不能互相推导的,有密文，没有解密key也推导不出来原文

加密解密速度慢,但是安全性好

特点:

公开解密key，保证数据的安全传递

公开机密key，保证数据的不可抵赖

code:

        /// <summary>
        /// 获取非对称的这对密钥
        /// </summary>
        /// <returns></returns>
        public static KeyValuePair<string, string> GetKeyPair()
        {
            RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
            return new KeyValuePair<string, string>(RSA.ToXmlString(false), RSA.ToXmlString(true));
        }

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="content">内容</param>
        /// <param name="key">密钥</param>
        /// <returns></returns>
        public static string Encrypt(string content, string key)
        {
            RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
            RSA.FromXmlString(key);
            UnicodeEncoding unicodeEncoding = new UnicodeEncoding();
            byte[] DataToEncrypt = unicodeEncoding.GetBytes(content);
            byte[] resultBytes = RSA.Encrypt(DataToEncrypt, false);
            return Convert.ToBase64String(resultBytes);
        }

        /// <summary>
        /// 解密  内容加解密key
        /// </summary>
        /// <param name="content"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string Decryp(string content, string key)
        {
            byte[] DataToEncrypt = Convert.FromBase64String(content);
            RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
            RSA.FromXmlString(key);
            byte[] resultBytes = RSA.Decrypt(DataToEncrypt, false);
            return Encoding.UTF8.GetString(resultBytes);
        }

        static void Main(string[] args)
        {
            //获得加密解密键值对
            KeyValuePair<string, string> keyValuePair = ReaEncrypt.GetKeyPair();
            //加密
            string rsaEnl = ReaEncrypt.Encrypt("ok", keyValuePair.Key);
            //解密
            string rsadDel = ReaEncrypt.Decryp(rsaEnl, keyValuePair.Value);
            Console.WriteLine("Hello World!");
        }