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("");
             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, );
             String s = n.ToString();
             if (s.Length %  > )
             {
                 s = new String('',  - s.Length % ) + s;
             }
             byte[] data = new byte[s.Length / ];
             String ocetstr;
             for (int i = ; i < data.Length; i++)
             {
                 ocetstr = s.Substring( * i, );
                 data[i] = Convert.ToByte(ocetstr, );
             }
             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