public static bool verify(string content, string signedString, string publicKey, string input_charset)

        {

            bool result = false;

            Encoding code = Encoding.GetEncoding(input_charset);

            byte[] Data = code.GetBytes(content);

            byte[] data = Convert.FromBase64String(signedString);

            RSAParameters paraPub = ConvertFromPublicKey(publicKey);

            RSACryptoServiceProvider rsaPub = new RSACryptoServiceProvider();

            rsaPub.ImportParameters(paraPub);

            SHA1 sh = new SHA1CryptoServiceProvider();

            result = rsaPub.VerifyData(Data, sh, data);

            return result;

        }

        /// <summary>

        /// 用RSA解密

        /// </summary>

        /// <param name="resData">待解密字符串</param>

        /// <param name="privateKey">私钥</param>

        /// <param name="input_charset">编码格式</param>

        /// <returns>解密结果</returns>

        public static string decryptData(string resData, string privateKey, string input_charset)

        {

            byte[] DataToDecrypt = Convert.FromBase64String(resData);

            List<byte> result = new List<byte>();

            for (int j = 0; j < DataToDecrypt.Length / 128; j++)

            {

                byte[] buf = new byte[128];

                for (int i = 0; i < 128; i++)

                {

                    buf[i] = DataToDecrypt[i + 128 * j];

                }

                result.AddRange(decrypt(buf, privateKey, input_charset));

            }

            byte[] source = result.ToArray();