public int Decode(int input)
{
IEnumerable <int> roundKeys = KeyScheduler.GetRoundKeys(RoundCount);
input = AddRoundKey(input, roundKeys.Last());
for (int i = roundKeys.Count() - 2; i >= 0; i--)
{
// Permutation Layer Except Last Round
if (i != RoundCount - 1)
{
input = Permutation.InversePermutate(input);
}
// SBox Substitution
byte[] inputBytes = GetBytes(input);
for (int j = 0; j < 4; j++)
{
inputBytes[j] = Substitution.InverseSubstitute(inputBytes[j]);
}
input = GetInt(inputBytes);
// Add Round Key
input = AddRoundKey(input, roundKeys.ElementAt(i));
}
return(input);
}
public void GetNext()
{
KeyScheduler a = new KeyScheduler
{
Key = key,
IV = iv
};
for (int i = 32; i <= 100; i++)
{
BitArray current = a.GetNext(i);
CollectionAssert.AreNotEqual(a.GetNext(i), current);
Assert.AreEqual(current.Length, i);
}
}
public void IsPseudoRandom()
{
KeyScheduler a = new KeyScheduler
{
Key = key,
IV = iv,
};
KeyScheduler b = new KeyScheduler
{
Key = key,
IV = iv,
};
for (int i = 0; i < 100; i++)
{
CollectionAssert.AreEqual(a.GetNext(i), b.GetNext(i));
}
}
private WordEncoder GetNewInstance(int wordSize)
{
WordEncoder encoder = new WordEncoder();
HashAlgorithm hasher = new SHA512Managed();
byte[] key = hasher.ComputeHash(new byte[] { 1, 2, 3 });
byte[] iv = hasher.ComputeHash(key);
KeyScheduler keyScheduler = new KeyScheduler
{
Key = key,
IV = iv,
};
encoder.WordSize = wordSize;
encoder.Seed = keyScheduler.GetNext(encoder.SeedSize);
encoder.Entropy = new BitArray(hasher.ComputeHash(iv));
return(encoder);
}
public void Clone()
{
KeyScheduler a = new KeyScheduler
{
Key = key,
IV = iv,
};
for (int i = 0; i < 10; i++)
{
a.GetNext(i);
}
KeyScheduler b = (KeyScheduler)a.Clone();
for (int i = 0; i < 10; i++)
{
CollectionAssert.AreEqual(a.GetNext(i), b.GetNext(i));
}
}
