本文实例讲述了jQuery+C#实现参数RSA加密传输功能。分享给大家供大家参考，具体如下：

注意：

参数传递的+号处理，在传输时会把+变成空格，不处理后端就报错了。

1、前端代码

2、后端代码

public class IndexController : Controller
{
 public ActionResult Login()
 {
 return View();
 }
 [HttpPost]
 public ActionResult Login(string pwd)
 {
 //密钥格式要生成pkcs#1格式的 而不是pkcs#8格式的
 string privateKey = @"MIICWwIBAAKBgQCa4KHNwDX44gGmmIAtRu4gjVYtGWZzcm4t+1wjUD4dn7fMLPvuK7ai4UrfDeEJE1RPwudJw+lJ6crql8wSIg7/DbTlG3ihsCT6dT9H5B9OoeR7K9VW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";
 try
 {
 RSACryptoServiceProvider rsaCryptoServiceProvider = CreateRsaProviderFromPrivateKey(privateKey);
 //把+号，再替换回来
 byte[] res = rsaCryptoServiceProvider.Decrypt(Convert.FromBaseString(pwd.Replace("%2B","+")), false);
 return Content(Encoding.UTF8.GetString(res));
 }
 catch (Exception exception)
 {
 }
 return Content("");
 }
 private RSACryptoServiceProvider CreateRsaProviderFromPrivateKey(string privateKey)
 {
 var privateKeyBits = System.Convert.FromBaseString(privateKey);
 var RSA = new RSACryptoServiceProvider();
 var RSAparams = new RSAParameters();
 using (BinaryReader binr = new BinaryReader(new MemoryStream(privateKeyBits)))
 {
 byte bt = 0;
 ushort twobytes = 0;
 twobytes = binr.ReadUInt16();
 if (twobytes == 0x8130)
 binr.ReadByte();
 else if (twobytes == 0x8230)
 binr.ReadInt16();
 else
 throw new Exception("Unexpected value read binr.ReadUInt16()");
 twobytes = binr.ReadUInt16();
 if (twobytes != 0x0102)
 throw new Exception("Unexpected version");
 bt = binr.ReadByte();
 if (bt != 0x00)
 throw new Exception("Unexpected value read binr.ReadByte()");
 RSAparams.Modulus = binr.ReadBytes(GetIntegerSize(binr));
 RSAparams.Exponent = binr.ReadBytes(GetIntegerSize(binr));
 RSAparams.D = binr.ReadBytes(GetIntegerSize(binr));
 RSAparams.P = binr.ReadBytes(GetIntegerSize(binr));
 RSAparams.Q = binr.ReadBytes(GetIntegerSize(binr));
 RSAparams.DP = binr.ReadBytes(GetIntegerSize(binr));
 RSAparams.DQ = binr.ReadBytes(GetIntegerSize(binr));
 RSAparams.InverseQ = binr.ReadBytes(GetIntegerSize(binr));
 }
 RSA.ImportParameters(RSAparams);
 return RSA;
 }
 private int GetIntegerSize(BinaryReader binr)
 {
 byte bt = 0;
 byte lowbyte = 0x00;
 byte highbyte = 0x00;
 int count = 0;
 bt = binr.ReadByte();
 if (bt != 0x02)
 return 0;
 bt = binr.ReadByte();
 if (bt == 0x81)
 count = binr.ReadByte();
 else
 if (bt == 0x82)
 {
 highbyte = binr.ReadByte();
 lowbyte = binr.ReadByte();
 byte[] modint = { lowbyte, highbyte, 0x00, 0x00 };
 count = BitConverter.ToInt32(modint, 0);
 }
 else
 {
 count = bt;
 }
 while (binr.ReadByte() == 0x00)
 {
 count -= 1;
 }
 binr.BaseStream.Seek(-1, SeekOrigin.Current);
 return count;
 }
}