// This function is defined as follow :
// Func (S, i) = HMAC(S || i) | HMAC2(S || i) | ... | HMAC(iterations) (S || i)
// where i is the block number.
private byte[] Func()
{
byte[] INT_block = Int(m_block);
m_HMACSHA512.TransformBlock(m_salt, 0, m_salt.Length, m_salt, 0);
m_HMACSHA512.TransformFinalBlock(INT_block, 0, INT_block.Length);
byte[] temp = m_HMACSHA512.Hash;
m_HMACSHA512.Initialize();
byte[] ret = temp;
for (int i = 2; i <= m_iterations; i++)
{
temp = m_HMACSHA512.ComputeHash(temp);
for (int j = 0; j < BlockSize; j++)
{
ret[j] ^= temp[j];
}
}
// increment the block count.
m_block++;
return(ret);
}
