RC4.cpp

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#include "RC4.hh"

void
RC4::restart(const void* key, size_t len)
{
  for (uint16_t i = 0; i < sizeof(m_state); i++)
    m_state[i] = i;

  m_x = 0;
  m_y = 0;

  const uint8_t* buf = (const uint8_t*) key;
  uint8_t j = 0;
  for (uint16_t i = 0; i < 256; i++) {
    j = j + m_state[i] + buf[i % len];
    uint8_t tmp = m_state[i];
    m_state[i] = m_state[j];
    m_state[j] = tmp;
  }
}