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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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 = ;
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;
}
}