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Remove preprocessor ignored codepath for Kyber

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Joost Rijneveld 2019-04-09 16:49:55 +02:00
parent 5853cb8e50
commit dfe9508551
No known key found for this signature in database
GPG Key ID: A4FE39CF49CBC553
1 changed files with 0 additions and 54 deletions
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54
crypto_kem/kyber768/clean/cbd.c
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@ -32,32 +32,6 @@ static uint64_t load_littleendian(const unsigned char *x, int bytes) {
* - const unsigned char *buf: pointer to input byte array
**************************************************/
void PQCLEAN_KYBER768_CLEAN_cbd(poly *r, const unsigned char *buf) {
#if KYBER_ETA == 3
uint32_t t, d, a[4], b[4];
int i, j;
for (i = 0; i < KYBER_N / 4; i++) {
t = (uint32_t)load_littleendian(buf + 3 * i, 3);
d = 0;
for (j = 0; j < 3; j++) {
d += (t >> j) & 0x249249;
}
a[0] = d & 0x7;
b[0] = (d >> 3) & 0x7;
a[1] = (d >> 6) & 0x7;
b[1] = (d >> 9) & 0x7;
a[2] = (d >> 12) & 0x7;
b[2] = (d >> 15) & 0x7;
a[3] = (d >> 18) & 0x7;
b[3] = (d >> 21);
r->coeffs[4 * i + 0] = (uint16_t)(a[0] + KYBER_Q - b[0]);
r->coeffs[4 * i + 1] = (uint16_t)(a[1] + KYBER_Q - b[1]);
r->coeffs[4 * i + 2] = (uint16_t)(a[2] + KYBER_Q - b[2]);
r->coeffs[4 * i + 3] = (uint16_t)(a[3] + KYBER_Q - b[3]);
}
#elif KYBER_ETA == 4
uint32_t t, d, a[4], b[4];
int i, j;
@ -82,32 +56,4 @@ void PQCLEAN_KYBER768_CLEAN_cbd(poly *r, const unsigned char *buf) {
r->coeffs[4 * i + 2] = (uint16_t)(a[2] + KYBER_Q - b[2]);
r->coeffs[4 * i + 3] = (uint16_t)(a[3] + KYBER_Q - b[3]);
}
#elif KYBER_ETA == 5
uint64_t t, d, a[4], b[4];
int i, j;
for (i = 0; i < KYBER_N / 4; i++) {
t = load_littleendian(buf + 5 * i, 5);
d = 0;
for (j = 0; j < 5; j++) {
d += (t >> j) & 0x0842108421UL;
}
a[0] = d & 0x1f;
b[0] = (d >> 5) & 0x1f;
a[1] = (d >> 10) & 0x1f;
b[1] = (d >> 15) & 0x1f;
a[2] = (d >> 20) & 0x1f;
b[2] = (d >> 25) & 0x1f;
a[3] = (d >> 30) & 0x1f;
b[3] = (d >> 35);
r->coeffs[4 * i + 0] = (uint16_t)(a[0] + KYBER_Q - b[0]);
r->coeffs[4 * i + 1] = (uint16_t)(a[1] + KYBER_Q - b[1]);
r->coeffs[4 * i + 2] = (uint16_t)(a[2] + KYBER_Q - b[2]);
r->coeffs[4 * i + 3] = (uint16_t)(a[3] + KYBER_Q - b[3]);
}
#else
#error "poly_getnoise in poly.c only supports eta in {3,4,5}"
#endif
}