using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
namespace StandardPBEStringEncryptor
{
public static class CryptoLib
{
public static string EncryptId(string ID)
{
string result = "";
ID = "abc" + ID + "xyz";
byte[] salt = new byte[8];
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
rng.GetBytes(salt);
System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
PKCSKeyGenerator kp = new PKCSKeyGenerator();
ICryptoTransform crypt = kp.Generate(
"kunteper",
salt,
1000,
1);
byte[] sonuc = crypt.TransformFinalBlock(encoding.GetBytes(ID), 0, encoding.GetBytes(ID).Length);
foreach (byte item in salt)
{
result += item.ToString("X2");
}
foreach (byte item in sonuc)
{
result += item.ToString("X2");
}
return result;
}
public static byte[] fromHexadecimal(String message)
{
if (message == null)
{
return null;
}
if ((message.Length % 2) != 0)
{
throw new Exception("bu iş olmaz mesaj bozuk");
}
try
{
byte[] result = new byte[message.Length / 2];
for (int i = 0; i < message.Length; i = i + 2)
{
int first = Convert.ToInt32("" + message[i], 16);
int second = Convert.ToInt32("" + message[i + 1], 16);
result[i / 2] = (byte)(0x0 + ((first & 0xff) << 4) + (second & 0xff));
}
return result;
}
catch (Exception e)
{
throw e;
}
}
public static string DecryptId(string ID)
{
byte[] pnlContent = fromHexadecimal(ID);
byte[] salt = new byte[8];
byte[] encryptedMessageKernel = new byte[24];
Array.Copy(pnlContent, salt, 8);
Array.Copy(pnlContent, 8, encryptedMessageKernel, 0, 24);
PKCSKeyGenerator kp = new PKCSKeyGenerator();
ICryptoTransform crypt = kp.Generate(
"kunteper"
, salt
, 1000
, 1);
byte[] sonuc = kp.Decryptor.TransformFinalBlock(encryptedMessageKernel, 0, encryptedMessageKernel.Length);
return Encoding.ASCII.GetString(sonuc).Replace("abc","").Replace("xyz","");
}
}
public class PKCSKeyGenerator
{
byte[] key = new byte[8], iv = new byte[8];
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
public byte[] Key { get { return key; } }
public byte[] IV { get { return iv; } }
public ICryptoTransform Encryptor { get { return des.CreateEncryptor(key, iv); } }
public ICryptoTransform Decryptor { get { return des.CreateDecryptor(key, iv); } }
public PKCSKeyGenerator() { }
public PKCSKeyGenerator(String keystring, byte[] salt, int md5iterations, int segments)
{
Generate(keystring, salt, md5iterations, segments);
}
public ICryptoTransform Generate(String keystring, byte[] salt, int md5iterations, int segments)
{
int HASHLENGTH = 16;
byte[] keymaterial = new byte[HASHLENGTH * segments];
byte[] psbytes;
psbytes = Encoding.UTF8.GetBytes(keystring);
byte[] data00 = new byte[psbytes.Length + salt.Length];
Array.Copy(psbytes, data00, psbytes.Length);
Array.Copy(salt, 0, data00, psbytes.Length, salt.Length);
MD5 md5 = new MD5CryptoServiceProvider();
byte[] result = null;
byte[] hashtarget = new byte[HASHLENGTH + data00.Length];
for (int j = 0; j < segments; j++)
{
if (j == 0) result = data00;
else
{
Array.Copy(result, hashtarget, result.Length);
Array.Copy(data00, 0, hashtarget, result.Length, data00.Length);
result = hashtarget;
}
for (int i = 0; i < md5iterations; i++)
result = md5.ComputeHash(result);
Array.Copy(result, 0, keymaterial, j * HASHLENGTH, result.Length);
}
Array.Copy(keymaterial, 0, key, 0, 8);
Array.Copy(keymaterial, 8, iv, 0, 8);
return Encryptor;
}
}
}
biliyorum kırılır belkide kıranınız vardır bana fark etmez :) ben sevdim bu olayı.
sanırım bende çok okumadım olay bu pkcs#5
