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Sharing tips on implementing parameter RSA encryption transmission function with jQuery+C#

小云云Original: 2018-01-06 10:15:082181browse

This article mainly introduces jQuery+C# to implement parameter RSA encryption transmission function, and analyzes js using jsencrypt.js plug-in front-end character data processing and transmission as well as C# background data conversion and RSA encryption-related operating techniques based on specific examples, and comes with jsencrypt. js is for readers to download and use for reference. Friends who need it can refer to it. I hope it can help everyone.

The example in this article describes the implementation of parameter RSA encryption transmission function by jQuery+C#. Share it with everyone for your reference, the details are as follows:

Note:

The + sign passed in the parameter will be processed into a space during transmission. If not processed, The terminal reported an error.

1. Front-end code

<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width" />
  <title>Login</title>
  <script src="jquery-1.10.2.min.js"></script>
  <script src="jsencrypt.min.js"></script>
  <script type="text/javascript">
    $(function () {
      var encrypt = new JSEncrypt();
      encrypt.setPublicKey($("#tra").val());
      var data = encrypt.encrypt("123456789");
      alert(data);
      $("#btn").click(function () {
        $.ajax({
          url: &#39;@Url.Action("Login")&#39;,
          data: "pwd=" + encodeURI(data).replace(/\+/g, &#39;%2B&#39;), //+号的处理：因为数据在网络上传输时，非字母数字字符都将被替换成百分号（%）后跟两位十六进制数，而base64编码在传输到后端的时候，+会变成空格，因此先替换掉。后端再替换回来
          type: &#39;post&#39;,
          success: function (msg) {
            alert(msg);
          }
        });
      });
    });
  </script>
</head>
<body>
  <p>
    <input type="button" id="btn" value="点我" />
    <textarea id="tra" rows="15" cols="65">
      MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCa4KHNwDX44gGmmIAtRu4gjVYt
GWZzcm4t+1wjUD4dn7fMLPvuK7ai4UrfDeEJE1RPwudJw+lJ6crql8wSIg7/DbTl
      G3ihsCT6dT9H5B9OoeR7K9VWUesaW/iyVL6HXiYOANabW14pvJATDmdq91Tfgp6P
      SQyvdfiRdV4r07crpQIDAQAB
    </textarea>
    <hr/>
    注意+号的处理
  </p>
</body>
</html>

2. Back-end code

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.FromBase64String(pwd.Replace("%2B","+")), false);
        return Content(Encoding.UTF8.GetString(res));
      }
      catch (Exception exception)
      {
      }
      return Content("");
    }
    private RSACryptoServiceProvider CreateRsaProviderFromPrivateKey(string privateKey)
    {
      var privateKeyBits = System.Convert.FromBase64String(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;
    }
}

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