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一、需求:
为了安全,项目中前台登陆用的密码需要加密传到后台，后台c#解密登陆密码。
二、解决方案
采用非对称加密算法RSA来达到目的，前台登陆页面一加载便发送一次ajax请求获取后台产生的公钥，用于前台加密，用户点击登陆时出发加密过程并提交加密的数据到后台，后台C#语言采用已封装好的RSA算法工具进行密码解密。
以下为c#RSA算法加密代码：
private static RSAParameters rsap = new RSAParameters() {
Modulus = Convert.FromBase64String(@"sB6+4rtO2sYeIZ8kJGGM647PIm+dJkwvSPNWcQ01D2cwPjIGV2c41h39FjYuzgAKzrIFjSvuBpG4y/PFEHuN+
LackSt6MU7qcbs7lzub8V97XZ5fddPaq/GWXo9mrIMMFDMW7z88WrukLGTvwkqySPBemc22rjua1uTR3azae7U="),
Exponent = Convert.FromBase64String(@"AQAB"),
P = Convert.FromBase64String(@"8yUCFVCufr3z2LDAwHaUO4r3na3WZqhAb3J7aXv/rj9UEXQWwZoG8IbUzV2fUhMXjnFXyrRSqywWdpxeE6oLWw=="),
Q = Convert.FromBase64String(@"uW6NlpzkBl4Do7K4RUDCsZ9uiVqnU0cbm7JVuygWJts+pu1ho5s0auUekQy5al6p4xifjWIcCsLvPxsLuWISLw=="),
DP = Convert.FromBase64String(@"rDsf0ad4I3E8hNcXgn28nLzgj8Hu6ILwOcGXZ+4c+/oB++cGo5cOqVxo6xwRWhsKCa2B6aV4FaZCNzymazl9lw=="),
DQ = Convert.FromBase64String(@"dVVT+FKMIs9IZEPJP+DrkTM94WHgcNyUxp9Aii2iXrHqYfvhBYJG18Dk54lypbECtLU2+GJ1NgYFFxxI/ePldw=="),
InverseQ = Convert.FromBase64String(@"z8qRY0+yyfZFNFPMtlTumpYyCXUbK+GpWnFp2hOyTABya/h7g4DCRE6iO9UZKgW4paB5K75mJwdBgVib5NgFiQ=="),
D = Convert.FromBase64String(@"W1ZWoLeLWaJNlho2YDfHIZLakX1Y/reb/jVUqySyU96sAlVnPITn0QOUcaR/+Y3EDRX+EwypUPbZ48v0c2vgYDHwIb
rIbsEyN+vHoUNJ319R5kUZ8Wlfw/w6/6BSclqbWQ8OdSj1cKwx/EEJh4iipqJ8HBTsmoT0anQHP/jdybE=")
};
private static string RSAEncrypt(string publicKey, string content) {
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(1024);// RSACryptoServiceProvider();
rsa.ImportParameters(rsap);//导入公钥
byte[] result = rsa.Encrypt(Encoding.UTF8.GetBytes(content), false);
return Convert.ToBase64String(result);
}
private static string RSADecrypt(string privateKey, string content) {
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(1024);
rsa.ImportParameters(rsap);
var result = rsa.Decrypt(Convert.FromBase64String(content), false);
return Encoding.UTF8.GetString(result);
}
后台传到前台的公钥信息为：
rsap.Exponent.HexEncode()；
rsap.Modulus.HexEncode()；
HexEncode()为字节数组类型静态扩展,只为每个字节转化为对应的16进制，代码如下：
public static string ToHexEncode(this byte[] bytes) {
return BitConverter.ToString(bytes).Replace("-", string.Empty);
}
采用上面静态对象rsap，经HexEncode传到前台的公钥信息为：
1.010001 2.B01EBEE2BB4EDAC61E219F2424618CEB8ECF226F9D264C2F48F356710D350F67303E3206576738D61DFD16362ECE000ACEB2058D2BEE0691B8CBF3C5107B
8DF8B69C912B7A314EEA71BB3B973B9BF15F7B5D9E5F75D3DAABF1965E8F66AC830C143316EF3F3C5ABBA42C64EFC24AB248F05E99CDB6AE3B9AD6E4D1DD
ACDA7BB5
前台js加密，从网上搜刮了RSA的js实现，页面需依次加入三个js文件：BigInt.js，Barrett.js，RSA.js,后面附上这三个js库。比如加密zjt，js代码如下：
setMaxDigits(130); var key = new RSAKeyPair(‘010001‘, "", ‘B01EBEE2BB4EDAC61E219F2424618CEB8ECF226F9D264C2F48F356710D350F67303E3206576738D61DFD163
62ECE000ACEB2058D2BEE0691B8CBF3C5107B8DF8B69C912B7A314EEA71BB3B973B9BF15F7B5D9E5F75D3DAABF1965E8F66AC830C143316EF3F3C5ABBA42C64
EFC24AB248F05E99CDB6AE3B9AD6E4D1DDACDA7BB5‘); var res = encryptedString(key,‘zjt‘)
得到res为加密结果，用于会传到后台，res结果为：
9839c4f8cf40e5cd30be61a1e215c571424fca76108aacecc5ca45f9cdb6c207f4477eff32d41799babe915fd8806fce18ad38c4732d96008c506484940da7
a9b47cb7bc40f8bb70e079f8ae91e2b46d8d5d9bd1fa6ed637176d67a2a437ac801cca25f7e7c33b482d36f980da52982d65e6e388f2b2c47c7fcdfa797802
f2a5
后台接收次加密的串，先转成字节，这里又用到了一个静态扩展HexDecode,转成字节，采用RSACryptoServiceProvider对象导入私钥进行解码：
public static byte[] HexDecode(this string me)
{
string s = me.Length % 2 == 1 ? "0" + me : me;
byte[] data = new byte[s.Length / 2];
for (int i = 0; i < data.Length; i++)
{
data[i] = byte.Parse(s.Substring(i + i, 2), NumberStyles.HexNumber);
}
return data;
}
public static string GetString(this byte[] content, Encoding encoding = null)
{
encoding = encoding ?? Encoding.ASCII;
return encoding.GetString(content);
}
解密过程如下：
var pass = "9839c4f8cf40e5cd30be61a1e215c571424fca76108aacecc5ca45f9cdb6c207f4477eff32d41799babe915fd8806fce18ad38c4732d96008c50648494
0da7a9b47cb7bc40f8bb70e079f8ae91e2b46d8d5d9bd1fa6ed637176d67a2a437ac801cca25f7e7c33b482d36f980da52982d65e6e388f2b2c47c7fcdfa797802
f2a5"; byte[] data = pass.HexDecode(); RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(1024); rsa.ImportParameters(rsap); var res = rsa.Decrypt(data, false); Console.WriteLine(res.GetString());//用到上面静态扩展，解密后结果为zjt
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原文地址：http://www.cnblogs.com/oxf5deb3/p/4355800.html
