public static byte[] GetCollision(byte[] source, CustomHasherBase hasher)
{
byte[] collision = new byte[source.Length];
Array.Copy(source, collision, source.Length);
Dictionary <byte, int> counter = new Dictionary <byte, int>();
for (int i = 0; i < collision.Length; ++i)
{
byte key = (byte)(collision[i] % hasher.Size + 1);
if (!counter.ContainsKey(key))
{
counter.Add(key, 0);
}
++counter[key];
}
foreach (byte key in counter.Keys.ToList())
{
if (counter[key] % 2 != 0)
{
--counter[key];
}
}
for (int i = 0; i < collision.Length; ++i)
{
byte key = (byte)(collision[i] % hasher.Size + 1);
if (counter[key] == 0)
{
continue;
}
if (counter[key] % 2 == 0)
{
collision[i] += (byte)(hasher.Size);
}
else
{
collision[i] -= (byte)(hasher.Size);
}
--counter[key];
}
return(collision);
}
private static byte[] GetHash(string input, CustomHasherBase hasher)
{
byte[] data = Encoding.UTF8.GetBytes(input);
return(hasher.ComputeHash(data));
}
