void kuz_lt (w128_t *w, int enc) {
int i, j;
uint8_t x;
// Linear vector from sect 5.1.2
const uint8_t kuz_lvec[16] = {
0x94, 0x20, 0x85, 0x10, 0xC2, 0xC0, 0x01, 0xFB,
0x01, 0xC0, 0xC2, 0x10, 0x85, 0x20, 0x94, 0x01 };
// 16 rounds
for (j=0; j<16; j++)
{
if (enc == KUZ_ENCRYPT)
{
// An LFSR with 16 elements from GF(2^8)
x = w->b[15]; // since lvec[15] = 1
for (i = 14; i >= 0; i--) {
w->b[i + 1] = w->b[i];
x ^= kuz_mul_gf256(w->b[i], kuz_lvec[i]);
}
w->b[0] = x;
} else {
x = w->b[0];
for (i = 0; i < 15; i++) {
w->b[i] = w->b[i + 1];
x ^= kuz_mul_gf256(w->b[i], kuz_lvec[i]);
}
w->b[15] = x;
}
}
}
INLINE void kuz_l(w128_t *w)
{
#if(!USE_ASM)
uint8_t x;
// 16 rounds
for (unsigned int j = 0; j < sizeof(kuz_lvec)/sizeof(kuz_lvec[0]); j++) {
// An LFSR with 16 elements from GF(2^8)
x = w->b[15]; // since lvec[15] = 1
for (int i = 14; i >= 0; i--) {
w->b[i + 1] = w->b[i];
x ^= kuz_mul_gf256(w->b[i], kuz_lvec[i]);
}
w->b[0] = x;
}
#else
#if(USE_MUL_TABLE)
kuz_l_asm_table(w);
#else
kuz_l_asm(w);
#endif
#endif
}
INLINE void kuz_l_inv(w128_t *w)
{
#if(!USE_ASM)
uint8_t x;
// 16 rounds
for (unsigned int j = 0; j < sizeof(kuz_lvec)/sizeof(kuz_lvec[0]); j++) {
x = w->b[0];
for (int i = 0; i < 15; i++) {
w->b[i] = w->b[i + 1];
x ^= kuz_mul_gf256(w->b[i], kuz_lvec[i]);
}
w->b[15] = x;
}
#else
#if(USE_MUL_TABLE)
kuz_l_inv_asm_table(w);
#else
kuz_l_inv_asm(w);
#endif
#endif
}
