void Encrypt(uint8_t *block, uint8_t *roundKeys)
{
uint32_t *block32 = (uint32_t *)block;
const uint32_t *rk = (uint32_t *)roundKeys;
uint32_t y = block32[0];
uint32_t x = block32[1];
uint8_t i = 0;
while (i < NUMBER_OF_ROUNDS) {
x = (rot32r8(x) + y) ^ READ_ROUND_KEY_DOUBLE_WORD(rk[i++]);
y = rot32l3(y) ^ x;
x = (rot32r8(x) + y) ^ READ_ROUND_KEY_DOUBLE_WORD(rk[i++]);
y = rot32l3(y) ^ x;
x = (rot32r8(x) + y) ^ READ_ROUND_KEY_DOUBLE_WORD(rk[i++]);
y = rot32l3(y) ^ x;
}
block32[0] = y;
block32[1] = x;
}
void round_f(uint32_t *left, uint32_t *right, uint32_t *roundKeys)
{
uint32_t temp;
uint8_t i;
uint16_t *b0_l = (uint16_t *)left;
uint16_t *b0_r = (uint16_t *)left + 1;
uint16_t *b1_l = (uint16_t *)right;
uint16_t *b1_r = (uint16_t *)right + 1;
/* left branch */
for (i = 0; i < 3; i++)
{
*left ^= READ_ROUND_KEY_DOUBLE_WORD(roundKeys[i]);
speckey(b0_l, b0_r);
}
/* right branch */
for (i = 0; i < 3; i++)
{
*right ^= READ_ROUND_KEY_DOUBLE_WORD(roundKeys[i + 3]);
speckey(b1_l, b1_r);
}
/* linear layer */
temp = *left;
*right ^= *left ^ rot32l8(*left) ^ rot32r8(*left);
*left = *right;
*right = temp;
}
void round_f_inverse(uint32_t *left, uint32_t *right, uint32_t *roundKeys)
{
uint32_t temp;
uint16_t *b0_l = (uint16_t *)left;
uint16_t *b0_r = (uint16_t *)left + 1;
uint16_t *b1_l = (uint16_t *)right;
uint16_t *b1_r = (uint16_t *)right + 1;
/* linear layer */
temp = *right;
*left ^= *right ^ rot32l8(*right) ^ rot32r8(*right);
*right = *left;
*left = temp;
/* right branch */
speckey_inverse(b1_l, b1_r);
*right ^= READ_ROUND_KEY_DOUBLE_WORD(roundKeys[5]);
speckey_inverse(b1_l, b1_r);
*right ^= READ_ROUND_KEY_DOUBLE_WORD(roundKeys[4]);
speckey_inverse(b1_l, b1_r);
*right ^= READ_ROUND_KEY_DOUBLE_WORD(roundKeys[3]);
/* left branch */
speckey_inverse(b0_l, b0_r);
*left ^= READ_ROUND_KEY_DOUBLE_WORD(roundKeys[2]);
speckey_inverse(b0_l, b0_r);
*left ^= READ_ROUND_KEY_DOUBLE_WORD(roundKeys[1]);
speckey_inverse(b0_l, b0_r);
*left ^= READ_ROUND_KEY_DOUBLE_WORD(roundKeys[0]);
}
