C++ (Cpp) ARES_SWAP_BYTE Exemples

Exemple #1

Fichier : ares_query.c Projet : 119120119/node

static void rc4(rc4_key* key, unsigned char *buffer_ptr, int buffer_len)
{
  unsigned char x;
  unsigned char y;
  unsigned char* state;
  unsigned char xorIndex;
  short counter;

  x = key->x;
  y = key->y;

  state = &key->state[0];
  for(counter = 0; counter < buffer_len; counter ++)
  {
    x = (unsigned char)((x + 1) % 256);
    y = (unsigned char)((state[x] + y) % 256);
    ARES_SWAP_BYTE(&state[x], &state[y]);

    xorIndex = (unsigned char)((state[x] + state[y]) % 256);

    buffer_ptr[counter] = (unsigned char)(buffer_ptr[counter]^state[xorIndex]);
  }
  key->x = x;
  key->y = y;
}

Exemple #2

Fichier : ares_init.c Projet : mobius/libuv

static int init_id_key(rc4_key* key,int key_data_len)
{
  unsigned char index1;
  unsigned char index2;
  unsigned char* state;
  short counter;
  unsigned char *key_data_ptr = 0;

  key_data_ptr = calloc(1,key_data_len);
  if (!key_data_ptr)
    return ARES_ENOMEM;

  state = &key->state[0];
  for(counter = 0; counter < 256; counter++)
    /* unnecessary AND but it keeps some compilers happier */
    state[counter] = (unsigned char)(counter & 0xff);
  randomize_key(key->state,key_data_len);
  key->x = 0;
  key->y = 0;
  index1 = 0;
  index2 = 0;
  for(counter = 0; counter < 256; counter++)
  {
    index2 = (unsigned char)((key_data_ptr[index1] + state[counter] +
                              index2) % 256);
    ARES_SWAP_BYTE(&state[counter], &state[index2]);

    index1 = (unsigned char)((index1 + 1) % key_data_len);
  }
  free(key_data_ptr);
  return ARES_SUCCESS;
}