Js参数RSA加密传输，jsencrypt.js的使用

时间：2023-03-08 16:02:10

注意几点：

　　1、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

<!DOCTYPE html>

<html>

<head>

    <meta name="viewport" content="width=device-width" />

    <title>Login</title>

    <script src="~/Scripts/jquery-1.10.2.min.js"></script>

    <script src="http://passport.cnblogs.com/scripts/jsencrypt.min.js"></script>

    <script type="text/javascript">

        $(function () {

            var encrypt = new JSEncrypt();

            encrypt.setPublicKey($("#tra").val());

            var data = encrypt.encrypt("");

            alert(data);

            $("#btn").click(function () {

                $.ajax({

                    url: '@Url.Action("Login")',

                    data: "pwd=" + encodeURI(data).replace(/\+/g, '%2B'),  //+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: 'post',

                    success: function (msg) {

                        alert(msg);

                    }

                });

            });

        });

    </script>

</head>

<body>

    <div>

        <input type="button" id="btn" value="点我" />

        <textarea id="tra" rows="" cols="">

            MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCa4KHNwDX44gGmmIAtRu4gjVYt

GWZzcm4t+1wjUD4dn7fMLPvuK7ai4UrfDeEJE1RPwudJw+lJ6crql8wSIg7/DbTl

            G3ihsCT6dT9H5B9OoeR7K9VWUesaW/iyVL6HXiYOANabW14pvJATDmdq91Tfgp6P

            SQyvdfiRdV4r07crpQIDAQAB

        </textarea>

        <hr/>

        注意+好的处理

    </div>

</body>

</html>

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

UesaW/iyVL6HXiYOANabW14pvJATDmdq91Tfgp6PSQyvdfiRdV4r07crpQIDAQAB

AoGABb+3gdb+qeG0b1CogVsT/7//UOaTzPk/FGneKQQTf4SsN+H7lVhTYTG9ARFC

JyoWg8IXqmn2ljhywHPTWWD2RCZIn2sYT1sVkGb70EgHGQLBraFHElmw+DsVJ+nD

fBCfMrJ1TYXlwigjRkaueaoGgG8LdR8XD+Xs5LersPLjZgECQQCguSB7C4wF6oSw

EDmwNF8ffT5cQc1U2OIq6NBG8rafrjb7LsjhOd03pmY7i4LbW3Vvq4AhQpJEdF1C

vd+Sk/BBAkEA9rBhqnyumV09zFEomSX3zZu+bdhTzM4bJDfEa95swp1gANCVvF/t

DCnlBf51EhCWdeGSpARPUkQnXrYfFUDiZQJAAZEshuaa6+fYeVr/JP+tucHf3Mhr

dxtSQTbZ6QcuzqnFMXfIT6HfzU4bCxOWKAthPsB+VFSw1mgIDMGLL4OvwQJAJlVy

V9PYLezXVZCnBmVoBINXLCqZmxHMFey0kS6XKAbcjEPdgNBHPcSk2jGYb540Q00y

RFqHGPmORKF4Yw0aIQJAd5JRtD3z2MgP/vPoKHJNHqY8bboVcmwqVAm6xCZoTCZz

jNV1Cnsdf4wBV3LCDzYBy+xR4qYNUy5CFXN+8WzzAA==";

            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 = ;

                ushort twobytes = ;

                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 = ;

            byte lowbyte = 0x00;

            byte highbyte = 0x00;

            int count = ;

            bt = binr.ReadByte();

            if (bt != 0x02)

                return ;

            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, );

                }

                else

                {

                    count = bt;

                }

            while (binr.ReadByte() == 0x00)

            {

                count -= ;

            }

            binr.BaseStream.Seek(-, SeekOrigin.Current);

            return count;

        }

    }

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