RSA加密(跨平台通用的)

　　　　 /// <summary>
        /// RSA加密
        /// </summary>
        /// <param name="strPublickey"></param>
        /// <param name="content"></param>
        /// <returns></returns>
        public string RsaEncrypt(string strPublickey, string content)
        {
            var rsa = new RSACryptoServiceProvider();
            var param = new RSAParameters();
            byte[] bdata = GetBytes("65537");
            param.Exponent = bdata;
            param.Modulus = GetBytes(strPublickey);
            rsa.ImportParameters(param);

            byte[] cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(content),false);

            return BitConverter.ToString(cipherbytes).Replace("-", string.Empty);
        }

        public byte[] GetBytes(String num)
        {
            BigInteger n = new BigInteger(num, 10);
            String s = n.ToString(2);
            if (s.Length % 8 > 0)
            {
                s = new String('0', 8 - s.Length % 8) + s;
            }
            byte[] data = new byte[s.Length / 8];
            String ocetstr;
            for (int i = 0; i < data.Length; i++)
            {
                ocetstr = s.Substring(8 * i, 8);
                data[i] = Convert.ToByte(ocetstr, 2);
            }
            return data;
        }
　　　　　　 调用方式
　　　　　　 var result = new BigInteger(pubkey, 16);
           String sp = RsaEncrypt(string.Format("{0}", result), message);

　　　　　　 BigInteger下载地址
　　　　　　 http://www.codeproject.com/Articles/2728/C-BigInteger-Class