c# RSA 加解密

　　　　 public static string publicKey = "<RSAKeyValue><Modulus>zUQAZhzjzJcNmEAG1lN+lzScePUh6t5iwHejCIpemILi6yBGyb5S2ZB7EX9v+T6FAx/A/LRNNJbgr8duv8mHttrWD5XSmncv83nXEgj6qbNkqgVtBHC0q10tqizpmQ5m9MsL7XXT+Y080wJ/r6d/SUFPo4Dpe8Mq/pRiDhyZz9M=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
        public static string privateKey = "<RSAKeyValue><Modulus>zUQAZhzjzJcNmEAG1lN+lzScePUh6t5iwHejCIpemILi6yBGyb5S2ZB7EX9v+T6FAx/A/LRNNJbgr8duv8mHttrWD5XSmncv83nXEgj6qbNkqgVtBHC0q10tqizpmQ5m9MsL7XXT+Y080wJ/r6d/SUFPo4Dpe8Mq/pRiDhyZz9M=</Modulus><Exponent>AQAB</Exponent><P>9Rl038ZjMl0YJznlvZLP8KR97/CXsvWA4nOJ/b8F1jH9nqsJEJ+bHW94zfXNQjExmilf/C06HybH2wrcBdjVcQ==</P><Q>1mUF6FYTmhd5GmYbKET1l5zxb6yYyWDhlPZO8J9X+Ia1aqXVKHHodWEAEBPWYpyslXwooTN24XTxepdjpHaHgw==</Q><DP>weO1dSB3cGv8o2tFtsXhATje92SYXNWhc4J68uSeNWeufkpHDYN1Lb/1DNkZ2vcXiiCY8eDFTcdb6oeYrndtwQ==</DP><DQ>hV6o8ySA4y3Q/1QfdsiXQu613vOuxC+JhUJITzXA4vDh8GsjFBrwMfzariW5CvVOA1wOZmF+hbha9BkzOj8mAw==</DQ><InverseQ>SNlR4TGrdZivLsOmmcOdebza77swbe5iU4T95y9P3yy1GjCj5ZqynMxyKah0AOVY5WoBhQ5ngrHhMhJ1AFuFLA==</InverseQ><D>EgMwocVRPCfZOo4Ly40CI9SrEnY4ZrrjIY6eEObLjEiYDxgC/jskXBEwq4VqVw3kcDS+I67Sw5Wl2+b9UfkmXn4dKmKu5Axcay8RrgBOVIVwjvnz9d6Q04bOGzOI1kctTHnqp1imm+HA1lwyu7UUypd/POLQozJVjjcGb+BZpiE=</D></RSAKeyValue>";
    
  #region 加解密
        /// <summary>
        /// RSA 加密
        /// </summary>
        /// <param name="rawInput">待加密的内容</param>
        /// <param name="publicKey">公钥</param>
        /// <returns></returns>
        public string RsaEncrypt(string rawInput)
        {
            if (string.IsNullOrEmpty(rawInput))
            {
                return string.Empty;
            }

            if (string.IsNullOrWhiteSpace(publicKey))
            {
                throw new ArgumentException("Invalid Public Key");
            }

            using (var rsaProvider = new RSACryptoServiceProvider())
            {
                var inputBytes = Encoding.UTF8.GetBytes(rawInput);//有含义的字符串转化为字节流
                rsaProvider.FromXmlString(publicKey);//载入公钥
                int bufferSize = (rsaProvider.KeySize / 8) - 11;//单块最大长度
                var buffer = new byte[bufferSize];
                using (MemoryStream inputStream = new MemoryStream(inputBytes),
                     outputStream = new MemoryStream())
                {
                    while (true)
                    { //分段加密
                        int readSize = inputStream.Read(buffer, 0, bufferSize);
                        if (readSize <= 0)
                        {
                            break;
                        }

                        var temp = new byte[readSize];
                        Array.Copy(buffer, 0, temp, 0, readSize);
                        var encryptedBytes = rsaProvider.Encrypt(temp, false);
                        outputStream.Write(encryptedBytes, 0, encryptedBytes.Length);
                    }
                    return Convert.ToBase64String(outputStream.ToArray());//转化为字节流方便传输
                }
            }
        }
        /// <summary>
        /// RSA 解密
        /// </summary>
        /// <param name="encryptedInput">待解密的内容</param>
        /// <param name="privateKey">私钥</param>
        /// <returns></returns>
        public string RsaDecrypt(string encryptedInput)
        {
            if (string.IsNullOrEmpty(encryptedInput))
            {
                return string.Empty;
            }

            if (string.IsNullOrWhiteSpace(privateKey))
            {
                throw new ArgumentException("Invalid Private Key");
            }

            using (var rsaProvider = new RSACryptoServiceProvider())
            {
                var inputBytes = Convert.FromBase64String(encryptedInput);
                rsaProvider.FromXmlString(privateKey);
                int bufferSize = rsaProvider.KeySize / 8;
                var buffer = new byte[bufferSize];
                using (MemoryStream inputStream = new MemoryStream(inputBytes),
                     outputStream = new MemoryStream())
                {
                    while (true)
                    {
                        int readSize = inputStream.Read(buffer, 0, bufferSize);
                        if (readSize <= 0)
                        {
                            break;
                        }

                        var temp = new byte[readSize];
                        Array.Copy(buffer, 0, temp, 0, readSize);
                        var rawBytes = rsaProvider.Decrypt(temp, false);
                        outputStream.Write(rawBytes, 0, rawBytes.Length);
                    }
                    return Encoding.UTF8.GetString(outputStream.ToArray());
                }
            }
        }


        
        #endregion