我正在编写一个程序来帮助我为我正在撰写的关于密码安全性的研究报告收集统计数据。当我尝试暴力破解 MD5 散列密码以显着提高性能时，我决定让应用程序在多个线程上运行。应用程序在单个线程上运行良好，但在 2 个线程运行时，在 TryPass 函数中的“使用 (MD5 md5Hash = MD5.Create())”处抛出 StackOverFlowException。
// Microsoft's GetMd5Hash function.
static string GetMd5Hash(MD5 md5Hash, string input)
{
// Convert the input string to a byte array and compute the hash.
byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(input));
// Create a new Stringbuilder to collect the bytes
// and create a string.
StringBuilder sBuilder = new StringBuilder();
// Loop through each byte of the hashed data
// and format each one as a hexadecimal string.
for (int i = 0; i < data.Length; i++)
{
sBuilder.Append(data[i].ToString("x2"));
}
// Return the hexadecimal string.
return sBuilder.ToString();
}
static bool TryPass(string attempt, string password)
{
using (MD5 md5Hash = MD5.Create())
{
if (GetMd5Hash(md5Hash, attempt) == password)
return true;
else
return false;
}
}
static bool BruteForce(BruteOptions bruteOptions)
{
if (bruteOptions.prefix.Length == 1 && TryPass(bruteOptions.prefix, bruteOptions.password)) // If it's the first in a series, try it.
return true;
for (int i = 0; i < bruteOptions.chars.Length; i++)
{
if (TryPass(bruteOptions.prefix + bruteOptions.chars[i], bruteOptions.password))
{
Console.WriteLine("The password is: " + bruteOptions.prefix + bruteOptions.chars[i]);
return true;
}
if (bruteOptions.prefix.Length + 1 < bruteOptions.maxLength)
if (BruteForce(bruteOptions))
return true;
//Console.WriteLine(prefix + chars[i]);
}
return false;
}
public struct BruteOptions
{
public string password, prefix;
public char[] chars;
public int maxLength;
}
static void OptionBruteForce()
{
Console.WriteLine("-----------------------");
Console.WriteLine("----- Brute-Force -----");
Console.WriteLine("-----------------------");
BruteOptions bruteOptions = new BruteOptions();
bruteOptions.password = ReadString("Enter the MD5 password hash to brute-force: ");
bruteOptions.chars = ReadString("Enter the characters to use: ").ToCharArray();
bruteOptions.maxLength = ReadIntegerRange("Max length of password: ", 1, 16);
bruteOptions.prefix = "";
Stopwatch myStopWatch = Stopwatch.StartNew();
int NUM_THREADS = bruteOptions.chars.Length;
Thread[] workers = new Thread[NUM_THREADS]; // Run a thread for each char.
var countdownEvent = new CountdownEvent(NUM_THREADS);
bool result = false;
// Start workers.
for (int i = 0; i < NUM_THREADS; i++)
{
int index = i;
BruteOptions newBruteOptions = bruteOptions;
newBruteOptions.prefix = bruteOptions.chars[index].ToString();
workers[index] = new Thread(delegate()
{
// Also check single char.
if (BruteForce(bruteOptions))
{
result = true;
// End all other threads.
for (int ii = 0; ii < NUM_THREADS; ii++)
{
if (workers[ii].ThreadState == System.Threading.ThreadState.Running && index != ii) // Ensures we don't prematurely abort this thread.
{
workers[ii].Abort();
countdownEvent.Signal(); // Signal so we can zero it and continue on the UI thread.
}
}
}
// Signal the CountdownEvent.
countdownEvent.Signal();
});
workers[index].Start();
}
// Wait for workers.
countdownEvent.Wait();
if (!result)
Console.WriteLine("No Match.");
Console.WriteLine("Took " + myStopWatch.ElapsedMilliseconds + " Milliseconds");
}
这就是所有相关的代码。任何有关为什么会发生这种情况的见解将不胜感激！我完全被难住了。我试图在初始化每个线程时指定更大的堆栈大小，但无济于事。
提前致谢！