【加密】RSA加密之实现

        private void btn_RSA_Click(object sender, EventArgs e)
        {
            //第一种方法调用            
            this.textBox1.Text = RSAEncrypt("", "key");//密文
            this.textBox2.Text = RSADecrypt("", this.textBox1.Text);

            //第二种方法调用            
            //this.textBox1.Text = RSAEncrypt2("key", "MyKey");
            //this.textBox2.Text = RSADecrypt2(this.textBox1.Text, "MyKey");

            //第三种方法调用
            //string publickey = "";
            //string privatekey = "";
            //this.textBox1.Text = RSA_Encrypt("key", out publickey, out privatekey);
            //this.textBox2.Text = RSA_Decrypt(this.textBox1.Text, privatekey);
        }

        /// <summary>
        /// RSA加密
        /// </summary>
        /// <param name="publickey"></param>
        /// <param name="content"></param>
        /// <returns></returns>
        public static string RSAEncrypt(string publickey, string content)
        {
            publickey = @"<RSAKeyValue><Modulus>5m9m14XH3oqLJ8bNGw9e4rGpXpcktv9MSkHSVFVMjHbfv+SJ5v0ubqQxa5YjLN4vc49z7SVju8s0X4gZ6AzZTn06jzWOgyPRV54Q4I0DCYadWW4Ze3e+BOtwgVU1Og3qHKn8vygoj40J6U85Z/PTJu3hN1m75Zr195ju7g9v4Hk=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();                     
            rsa.FromXmlString(publickey);
            byte[] cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(content), false);
            return Convert.ToBase64String(cipherbytes);
        }
        /// <summary>
        /// RSA解密
        /// </summary>
        /// <param name="privatekey"></param>
        /// <param name="content"></param>
        /// <returns></returns>
        public static string RSADecrypt(string privatekey, string content)
        {
            privatekey = @"<RSAKeyValue><Modulus>5m9m14XH3oqLJ8bNGw9e4rGpXpcktv9MSkHSVFVMjHbfv+SJ5v0ubqQxa5YjLN4vc49z7SVju8s0X4gZ6AzZTn06jzWOgyPRV54Q4I0DCYadWW4Ze3e+BOtwgVU1Og3qHKn8vygoj40J6U85Z/PTJu3hN1m75Zr195ju7g9v4Hk=</Modulus><Exponent>AQAB</Exponent><P>/hf2dnK7rNfl3lbqghWcpFdu778hUpIEBixCDL5WiBtpkZdpSw90aERmHJYaW2RGvGRi6zSftLh00KHsPcNUMw==</P><Q>6Cn/jOLrPapDTEp1Fkq+uz++1Do0eeX7HYqi9rY29CqShzCeI7LEYOoSwYuAJ3xA/DuCdQENPSoJ9KFbO4Wsow==</Q><DP>ga1rHIJro8e/yhxjrKYo/nqc5ICQGhrpMNlPkD9n3CjZVPOISkWF7FzUHEzDANeJfkZhcZa21z24aG3rKo5Qnw==</DP><DQ>MNGsCB8rYlMsRZ2ek2pyQwO7h/sZT8y5ilO9wu08Dwnot/7UMiOEQfDWstY3w5XQQHnvC9WFyCfP4h4QBissyw==</DQ><InverseQ>EG02S7SADhH1EVT9DD0Z62Y0uY7gIYvxX/uq+IzKSCwB8M2G7Qv9xgZQaQlLpCaeKbux3Y59hHM+KpamGL19Kg==</InverseQ><D>vmaYHEbPAgOJvaEXQl+t8DQKFT1fudEysTy31LTyXjGu6XiltXXHUuZaa2IPyHgBz0Nd7znwsW/S44iql0Fen1kzKioEL3svANui63O3o5xdDeExVM6zOf1wUUh/oldovPweChyoAdMtUzgvCbJk1sYDJf++Nr0FeNW1RB1XG30=</D></RSAKeyValue>";
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();            
            rsa.FromXmlString(privatekey);
            byte[]  cipherbytes = rsa.Decrypt(Convert.FromBase64String(content), false);
            return Encoding.UTF8.GetString(cipherbytes);
        } 

/// <summary>
        /// 加密
        /// </summary>
        /// <param name="s"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public string RSAEncrypt2(string s, string key)
        {
            if (string.IsNullOrEmpty(s)) throw new ArgumentException("An empty string value cannot be encrypted.");
            if (string.IsNullOrEmpty(key)) throw new ArgumentException("Cannot encrypt using an empty key. Please supply an encryption key.");
            CspParameters cspp = new CspParameters();
            cspp.KeyContainerName = key;
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(cspp);
            rsa.PersistKeyInCsp = true;
            byte[] bytes = rsa.Encrypt(System.Text.UTF8Encoding.UTF8.GetBytes(s), true);
            return BitConverter.ToString(bytes);
        }
        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="s"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public  string RSADecrypt2(string s, string key)
        {
            if (string.IsNullOrEmpty(s)) throw new ArgumentException("An empty string value cannot be encrypted.");
            if (string.IsNullOrEmpty(key)) throw new ArgumentException("Cannot decrypt using an empty key. Please supply a decryption key.");
            CspParameters cspp = new CspParameters();
            cspp.KeyContainerName = key;
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(cspp);
            rsa.PersistKeyInCsp = true;
            string[] decryptArray = s.Split(new string[] { "-" }, StringSplitOptions.None);
            byte[] decryptByteArray = Array.ConvertAll<string, byte>(decryptArray, (a => Convert.ToByte(byte.Parse(a, System.Globalization.NumberStyles.HexNumber))));
            byte[] bytes = rsa.Decrypt(decryptByteArray, true);
            return System.Text.UTF8Encoding.UTF8.GetString(bytes);             
        }

        UnicodeEncoding ByteConverter = new UnicodeEncoding();
        //RSA加密,随机生成公私钥对并作为输出参返回
        public string RSA_Encrypt(string content,out string publickey,out string privatekey)
        {
            publickey = "";
            privatekey = "";  

            try
            {
                //方法1
                //RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
                //publickey = Convert.ToBase64String(RSA.ExportCspBlob(false));
                //privatekey = Convert.ToBase64String(RSA.ExportCspBlob(true));

                //方法2
                //RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
                //publickey = RSA.ToXmlString(false);
                //privatekey = RSA.ToXmlString(true);

                //方法3                
                CspParameters cspp = new CspParameters();
                cspp.KeyContainerName = "mykey";
                RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(cspp);

                byte[] bytes_Cypher_Text = RSA.Encrypt(ByteConverter.GetBytes(content),false);
                return  Convert.ToBase64String(bytes_Cypher_Text);
            }
            catch (CryptographicException e)
            {
                Console.WriteLine(e.Message);
                return null;
            }
        }

        //RSA解密
        public string RSA_Decrypt(string str_Cypher_Text, string privatekey)
        {
            try
            {
                //方法1
                //RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
                //byte[] bytes_Public_Key = Convert.FromBase64String(privatekey);
                //RSA.ImportCspBlob(bytes_Public_Key);

                //方法2
                //RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
                //RSA.FromXmlString(privatekey);

                //方法3
                CspParameters cspp = new CspParameters();
                cspp.KeyContainerName = "mykey";
                RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(cspp);

                byte[] bytes_Content = RSA.Decrypt(Convert.FromBase64String(str_Cypher_Text), false);
                return ByteConverter.GetString(bytes_Content);               
            }
            catch (CryptographicException e)
            {
                Console.WriteLine(e.ToString());
                return null;
            }
        }