注意幾點：
1、參數傳遞的+號處理，在傳輸時會把+變成空格，不處理后端就報錯了。
1、前端代碼
<!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("123456789"); alert(data); $("#btn").click(function () { $.ajax({ url: '@Url.Action("Login")', data: "pwd=" + encodeURI(data).replace(//+/g, '%2B'), //+號的處理：因為數據在網絡上傳輸時，非字母數字字符都將被替換成百分號（%）后跟兩位十六進制數，而base64編碼在傳輸到后端的時候，+會變成空格，因此先替換掉。后端再替換回來 type: 'post', success: function (msg) { alert(msg); } }); }); }); </script></head><body> <div> <input type="button" id="btn" value="點我" /> <textarea id="tra" rows="15" cols="65"> MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCa4KHNwDX44gGmmIAtRu4gjVYtGWZzcm4t+1wjUD4dn7fMLPvuK7ai4UrfDeEJE1RPwudJw+lJ6crql8wSIg7/DbTl G3ihsCT6dT9H5B9OoeR7K9VWUesaW/iyVL6HXiYOANabW14pvJATDmdq91Tfgp6P SQyvdfiRdV4r07crpQIDAQAB </textarea> <hr/> 注意+好的處理 </div></body></html>2、后端代碼
public class IndexController : Controller { public ActionResult Login() { return View(); } [HttpPost] public ActionResult Login(string pwd) { //密鑰格式要生成pkcs#1格式的 而不是pkcs#8格式的 string privateKey = @"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"; try { RSACryptoServiceProvider rsaCryptoServiceProvider = CreateRsaProviderFromPrivateKey(privateKey); //把+號，再替換回來 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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