RSA加密（前端js）和MD5加密(后台)同时使用实例

新公司对于用户密码保护十分严密，采用了两种加密方式，

例如修改密码时，仅加密流程如下

首先在前端使用RSA加密方式对密码进行一次加密，数据传到后台， 然后RSA解密,最后存入数据库前，再进行一次MD5盐值加密

功能实现如下

项目中引用一个js文件  文件名  jsencrypt.min.js

下载地址：https://pan.baidu.com/s/1Nmb183-5-x8NmVu83ftnYg 提取码: w3a7

前台加密部分：

var encrypt = new JSEncrypt();
encrypt.setPublicKey("此处为RSA公钥");

var myPassword="123456";

 myPassword= encodeURI(myPassword).replace(/+/g, '%2B');

此时即得到加密处理过的密码

后台处理部分：

注意添加命名空间 using System.Security.Cryptography;

private string Encryption(string myPassword, string key)
{

//RSA解密
string privateKey = "此处为RSA私钥";
RSACreatKey RsaCreate = new RSACreatKey();
RSACryptoServiceProvider rsaCryptoServiceProvider = RsaCreate.CreateRsaKeyPair(privateKey);
byte[] rc = rsaCryptoServiceProvider.Decrypt(Convert.FromBase64String(myPassword.Replace("%2B", "+")), false);

//MD5+盐值加密后返回
return MD5password.MD5Encoding(Encoding.UTF8.GetString(rc), key);

}

//RSA具体解密过程 即 RSACreatKey 类中CreateRsaKeyPair方法

public RSACryptoServiceProvider CreateRsaKeyPair(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;
}

MD5盐值加密过程  //即MD5password类中的MD5Encoding方法

//MD5加密

public static string MD5Encoding(string psw) {
MD5 md5 = MD5.Create();
byte[] bs = Encoding.UTF8.GetBytes(psw);
byte[] hs = md5.ComputeHash(bs);
StringBuilder stb = new StringBuilder();
foreach (byte b in hs)
{
// 以十六进制格式格式化
stb.Append(b.ToString("x2"));
}
return stb.ToString();
}

//MD5盐值加密

public static string MD5Encoding(string rawPass, object salt)
{
if (salt == null) return rawPass;
return MD5Encoding(rawPass + "{" + salt.ToString() + "}");
}