在登录时，前台页面的用户名、密码都是明文传输到后台的，漏洞扫描认为这样子不安全，就想到了前台js加密，后台解密的方法，要用到jsencrypt.js，具体代码如下：
前台页面：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script> <script src="Scripts/jsencrypt.min.js" type="text/javascript"></script> <script type="text/javascript"> function subData() { var encrypt = new JSEncrypt(); var publicKey = $("#pubkey").val(); encrypt.setPublicKey(publicKey); var userdata = {}; userdata.Username = encodeURI(encrypt.encrypt($("#tUsername").val())); userdata.Password = encodeURI(encrypt.encrypt($("#tPassword").val())); $.post("Handler1.ashx", userdata, function (r) { alert(r); }); } </script> </head> <body> 用户名：<input type="text" id="tUsername" /><br /> 密码：<input type="password" id="tPassword" /><br /> <input type="button" onclick="subData()" value="登录" /> <textarea id="pubkey" rows="15" cols="65" style="display:none"> MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDZpm0555ciZabX/1uVDI07cJUI 66mcK2yf5FDB+KOKUrFyWY/xYS8csRDSN1vDfNnmdN45vGr+IMrEeZVqri/tvEL6 3N1JEWlKkvXolLpA6DHc/OKjXR9oQ93MDpftswOSdD5tQxplEDDemBeY2/Qh3RTB MGKsFuPoYKRxSQP7xwIDAQAB </textarea> </body> </html>
后台处理程序：
using System; using System.Collections.Generic; using System.Web; using System.Security.Cryptography; using System.Text; using System.IO; namespace WebApplication1 { /// <summary> /// Handler1 的摘要说明 /// </summary> public class Handler1 : IHttpHandler { private const string privateKey = @"MIICXwIBAAKBgQDZpm0555ciZabX/1uVDI07cJUI66mcK2yf5FDB+KOKUrFyWY/x YS8csRDSN1vDfNnmdN45vGr+IMrEeZVqri/tvEL63N1JEWlKkvXolLpA6DHc/OKj XR9oQ93MDpftswOSdD5tQxplEDDemBeY2/Qh3RTBMGKsFuPoYKRxSQP7xwIDAQAB AoGBAMAchXbB84YaAZ3QOQ8jyBm6MuJv2QMO1U+AoMPF6txyR0xuv35I0OPbasSS tn2j21XuvCRsKmhrm262/uruG0B0jclwruCs/HejvyH9l6/taIMms8UepJqt860b YbmKcECYKacjPe6+j2OyMCQiG1I+E0NbEe0kq2kbWSyqEuHJAkEA4tfWaC5o2caM oedrn6u3QuWNvDqtzvJHYzGg3D6hQMSabbxXt0UOebnEegWPeGdR+0fmNCy7SQdO vfkThb6rswJBAPWgGPp9eQeA8kIwj5pbtyyqsGUhkmM+/PnMe7V9S7O7A7l6NJvq Sdg7RMEYtpm+B9F0aRlHxRh4/0Rw7GmFFZ0CQQCMl00RYMInRwFeTvnLCjgYxAEm Sg/zFQHdnqKeHkr+w1sa7AJJWglwtAvrvIqBCzgqTxOD/r1Ms7S/1SGeYOA1AkEA 6ikcZwDjNuIZEjzVSiSRdgWrcF4W/oJ4DXSBoz21w7xQCqyUJueuSnQGUcfLnLnr HiVKZI1lOrVvNcIpv1beiQJBAKEIKyZrqqdlM7PaHIyqdSMnjNrJ5ixTek6y5OCW GZ+Tph2YwU3ffpyugfKRxE/FMFlK2x6Mxp7UOtAWkfXaHEE="; private const string publicKey = @"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDZpm0555ciZabX/1uVDI07cJUI 66mcK2yf5FDB+KOKUrFyWY/xYS8csRDSN1vDfNnmdN45vGr+IMrEeZVqri/tvEL6 3N1JEWlKkvXolLpA6DHc/OKjXR9oQ93MDpftswOSdD5tQxplEDDemBeY2/Qh3RTB MGKsFuPoYKRxSQP7xwIDAQAB"; public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; string Username = context.Request["Username"]; string Password = context.Request["Password"]; //解密 RSACryptoService rsa = new RSACryptoService(privateKey, publicKey); Username = rsa.Decrypt(Username); Password = rsa.Decrypt(Password); context.Response.Write("ok"); } public bool IsReusable { get { return false; } } } /// <summary> /// RSA类 /// </summary> public class RSACryptoService { private RSACryptoServiceProvider _privateKeyRsaProvider; private RSACryptoServiceProvider _publicKeyRsaProvider; public RSACryptoService(string privateKey, string publicKey = null) { if (!string.IsNullOrEmpty(privateKey)) { _privateKeyRsaProvider = CreateRsaProviderFromPrivateKey(privateKey); } if (!string.IsNullOrEmpty(publicKey)) { _publicKeyRsaProvider = CreateRsaProviderFromPublicKey(publicKey); } } public string Decrypt(string cipherText) { if (_privateKeyRsaProvider == null) { throw new Exception("_privateKeyRsaProvider is null"); } return Encoding.UTF8.GetString(_privateKeyRsaProvider.Decrypt(System.Convert.FromBase64String(cipherText), false)); } public string Encrypt(string text) { if (_publicKeyRsaProvider == null) { throw new Exception("_publicKeyRsaProvider is null"); } return Convert.ToBase64String(_publicKeyRsaProvider.Encrypt(Encoding.UTF8.GetBytes(text), false)); } 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; } private RSACryptoServiceProvider CreateRsaProviderFromPublicKey(string publicKeyString) { // encoded OID sequence for PKCS #1 rsaEncryption szOID_RSA_RSA = "1.2.840.113549.1.1.1" byte[] SeqOID = { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 }; byte[] x509key; byte[] seq = new byte[15]; int x509size; x509key = Convert.FromBase64String(publicKeyString); x509size = x509key.Length; // --------- Set up stream to read the asn.1 encoded SubjectPublicKeyInfo blob ------ using (MemoryStream mem = new MemoryStream(x509key)) { using (BinaryReader binr = new BinaryReader(mem)) //wrap Memory Stream with BinaryReader for easy reading { byte bt = 0; ushort twobytes = 0; twobytes = binr.ReadUInt16(); if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81) binr.ReadByte(); //advance 1 byte else if (twobytes == 0x8230) binr.ReadInt16(); //advance 2 bytes else return null; seq = binr.ReadBytes(15); //read the Sequence OID if (!CompareBytearrays(seq, SeqOID)) //make sure Sequence for OID is correct return null; twobytes = binr.ReadUInt16(); if (twobytes == 0x8103) //data read as little endian order (actual data order for Bit String is 03 81) binr.ReadByte(); //advance 1 byte else if (twobytes == 0x8203) binr.ReadInt16(); //advance 2 bytes else return null; bt = binr.ReadByte(); if (bt != 0x00) //expect null byte next return null; twobytes = binr.ReadUInt16(); if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81) binr.ReadByte(); //advance 1 byte else if (twobytes == 0x8230) binr.ReadInt16(); //advance 2 bytes else return null; twobytes = binr.ReadUInt16(); byte lowbyte = 0x00; byte highbyte = 0x00; if (twobytes == 0x8102) //data read as little endian order (actual data order for Integer is 02 81) lowbyte = binr.ReadByte(); // read next bytes which is bytes in modulus else if (twobytes == 0x8202) { highbyte = binr.ReadByte(); //advance 2 bytes lowbyte = binr.ReadByte(); } else return null; byte[] modint = { lowbyte, highbyte, 0x00, 0x00 }; //reverse byte order since asn.1 key uses big endian order int modsize = BitConverter.ToInt32(modint, 0); int firstbyte = binr.PeekChar(); if (firstbyte == 0x00) { //if first byte (highest order) of modulus is zero, don't include it binr.ReadByte(); //skip this null byte modsize -= 1; //reduce modulus buffer size by 1 } byte[] modulus = binr.ReadBytes(modsize); //read the modulus bytes if (binr.ReadByte() != 0x02) //expect an Integer for the exponent data return null; int expbytes = (int)binr.ReadByte(); // should only need one byte for actual exponent data (for all useful values) byte[] exponent = binr.ReadBytes(expbytes); // ------- create RSACryptoServiceProvider instance and initialize with public key ----- RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); RSAParameters RSAKeyInfo = new RSAParameters(); RSAKeyInfo.Modulus = modulus; RSAKeyInfo.Exponent = exponent; RSA.ImportParameters(RSAKeyInfo); return RSA; } } } private bool CompareBytearrays(byte[] a, byte[] b) { if (a.Length != b.Length) return false; int i = 0; foreach (byte c in a) { if (c != b[i]) return false; i++; } return true; } } }
效果如下：
加密后的数据：
后台解密：
