Method GenerateTables

Libraries/unrar/rijndael.cpp:436–465

    (w = (uint)x, w = (w<<1)^(w<<3)^(w<<6), (byte)(0x05^(w^(w>>8))))

void Rijndael::GenerateTables()
{
  unsigned char pow[512],log[256];
  int i = 0, w = 1; 
  do
  {   
    pow[i] = (byte)w;
    pow[i + 255] = (byte)w;
    log[w] = (byte)i++;
    w ^=  (w << 1) ^ (w & ff_hi ? ff_poly : 0);
  } while (w != 1);
 
  for (int i = 0,w = 1; i < sizeof(rcon)/sizeof(rcon[0]); i++)
  {
    rcon[i] = w;
    w = (w << 1) ^ (w & ff_hi ? ff_poly : 0);
  }
  for(int i = 0; i < 256; ++i)
  {   
    unsigned char b=S[i]=fwd_affine(FFinv((byte)i));
    T1[i][1]=T1[i][2]=T2[i][2]=T2[i][3]=T3[i][0]=T3[i][3]=T4[i][0]=T4[i][1]=b;
    T1[i][0]=T2[i][1]=T3[i][2]=T4[i][3]=FFmul02(b);
    T1[i][3]=T2[i][0]=T3[i][1]=T4[i][2]=FFmul03(b);
    S5[i] = b = FFinv(inv_affine((byte)i));
    U1[b][3]=U2[b][0]=U3[b][1]=U4[b][2]=T5[i][3]=T6[i][0]=T7[i][1]=T8[i][2]=FFmul0b(b);
    U1[b][1]=U2[b][2]=U3[b][3]=U4[b][0]=T5[i][1]=T6[i][2]=T7[i][3]=T8[i][0]=FFmul09(b);
    U1[b][2]=U2[b][3]=U3[b][0]=U4[b][1]=T5[i][2]=T6[i][3]=T7[i][0]=T8[i][1]=FFmul0d(b);
    U1[b][0]=U2[b][1]=U3[b][2]=U4[b][3]=T5[i][0]=T6[i][1]=T7[i][2]=T8[i][3]=FFmul0e(b);
  }
}


#if 0