mirror of
https://github.com/henrydcase/pqc.git
synced 2024-11-30 03:11:43 +00:00
ac2c20045c
* Add McEliece reference implementations * Add Vec implementations of McEliece * Add sse implementations * Add AVX2 implementations * Get rid of stuff not supported by Mac ABI * restrict to two cores * Ditch .data files * Remove .hidden from all .S files * speed up duplicate consistency tests by batching * make cpuinfo more robust * Hope to stabilize macos cpuinfo without ccache * Revert "Hope to stabilize macos cpuinfo without ccache" This reverts commit 6129c3cabe1abbc8b956bc87e902a698e32bf322. * Just hardcode what's available at travis * Fixed-size types in api.h * namespace all header files in mceliece * Ditch operations.h * Get rid of static inline functions * fixup! Ditch operations.h
140 lines
3.0 KiB
C
140 lines
3.0 KiB
C
/*
|
|
This file is for functions for field arithmetic
|
|
*/
|
|
|
|
#include "gf.h"
|
|
|
|
#include "params.h"
|
|
|
|
gf PQCLEAN_MCELIECE348864F_CLEAN_gf_iszero(gf a) {
|
|
uint32_t t = a;
|
|
|
|
t -= 1;
|
|
t >>= 19;
|
|
|
|
return (gf) t;
|
|
}
|
|
|
|
gf PQCLEAN_MCELIECE348864F_CLEAN_gf_add(gf in0, gf in1) {
|
|
return in0 ^ in1;
|
|
}
|
|
|
|
gf PQCLEAN_MCELIECE348864F_CLEAN_gf_mul(gf in0, gf in1) {
|
|
int i;
|
|
|
|
uint32_t tmp;
|
|
uint32_t t0;
|
|
uint32_t t1;
|
|
uint32_t t;
|
|
|
|
t0 = in0;
|
|
t1 = in1;
|
|
|
|
tmp = t0 * (t1 & 1);
|
|
|
|
for (i = 1; i < GFBITS; i++) {
|
|
tmp ^= (t0 * (t1 & (1 << i)));
|
|
}
|
|
|
|
t = tmp & 0x7FC000;
|
|
tmp ^= t >> 9;
|
|
tmp ^= t >> 12;
|
|
|
|
t = tmp & 0x3000;
|
|
tmp ^= t >> 9;
|
|
tmp ^= t >> 12;
|
|
|
|
return tmp & ((1 << GFBITS) - 1);
|
|
}
|
|
|
|
/* input: field element in */
|
|
/* return: in^2 */
|
|
static inline gf gf_sq(gf in) {
|
|
const uint32_t B[] = {0x55555555, 0x33333333, 0x0F0F0F0F, 0x00FF00FF};
|
|
|
|
uint32_t x = in;
|
|
uint32_t t;
|
|
|
|
x = (x | (x << 8)) & B[3];
|
|
x = (x | (x << 4)) & B[2];
|
|
x = (x | (x << 2)) & B[1];
|
|
x = (x | (x << 1)) & B[0];
|
|
|
|
t = x & 0x7FC000;
|
|
x ^= t >> 9;
|
|
x ^= t >> 12;
|
|
|
|
t = x & 0x3000;
|
|
x ^= t >> 9;
|
|
x ^= t >> 12;
|
|
|
|
return x & ((1 << GFBITS) - 1);
|
|
}
|
|
|
|
gf PQCLEAN_MCELIECE348864F_CLEAN_gf_inv(gf in) {
|
|
gf tmp_11;
|
|
gf tmp_1111;
|
|
|
|
gf out = in;
|
|
|
|
out = gf_sq(out);
|
|
tmp_11 = PQCLEAN_MCELIECE348864F_CLEAN_gf_mul(out, in); // 11
|
|
|
|
out = gf_sq(tmp_11);
|
|
out = gf_sq(out);
|
|
tmp_1111 = PQCLEAN_MCELIECE348864F_CLEAN_gf_mul(out, tmp_11); // 1111
|
|
|
|
out = gf_sq(tmp_1111);
|
|
out = gf_sq(out);
|
|
out = gf_sq(out);
|
|
out = gf_sq(out);
|
|
out = PQCLEAN_MCELIECE348864F_CLEAN_gf_mul(out, tmp_1111); // 11111111
|
|
|
|
out = gf_sq(out);
|
|
out = gf_sq(out);
|
|
out = PQCLEAN_MCELIECE348864F_CLEAN_gf_mul(out, tmp_11); // 1111111111
|
|
|
|
out = gf_sq(out);
|
|
out = PQCLEAN_MCELIECE348864F_CLEAN_gf_mul(out, in); // 11111111111
|
|
|
|
return gf_sq(out); // 111111111110
|
|
}
|
|
|
|
/* input: field element den, num */
|
|
/* return: (num/den) */
|
|
gf PQCLEAN_MCELIECE348864F_CLEAN_gf_frac(gf den, gf num) {
|
|
return PQCLEAN_MCELIECE348864F_CLEAN_gf_mul(PQCLEAN_MCELIECE348864F_CLEAN_gf_inv(den), num);
|
|
}
|
|
|
|
/* input: in0, in1 in GF((2^m)^t)*/
|
|
/* output: out = in0*in1 */
|
|
void PQCLEAN_MCELIECE348864F_CLEAN_GF_mul(gf *out, const gf *in0, const gf *in1) {
|
|
int i, j;
|
|
|
|
gf prod[ SYS_T * 2 - 1 ];
|
|
|
|
for (i = 0; i < SYS_T * 2 - 1; i++) {
|
|
prod[i] = 0;
|
|
}
|
|
|
|
for (i = 0; i < SYS_T; i++) {
|
|
for (j = 0; j < SYS_T; j++) {
|
|
prod[i + j] ^= PQCLEAN_MCELIECE348864F_CLEAN_gf_mul(in0[i], in1[j]);
|
|
}
|
|
}
|
|
|
|
//
|
|
|
|
for (i = (SYS_T - 1) * 2; i >= SYS_T; i--) {
|
|
prod[i - SYS_T + 9] ^= PQCLEAN_MCELIECE348864F_CLEAN_gf_mul(prod[i], (gf) 877);
|
|
prod[i - SYS_T + 7] ^= PQCLEAN_MCELIECE348864F_CLEAN_gf_mul(prod[i], (gf) 2888);
|
|
prod[i - SYS_T + 5] ^= PQCLEAN_MCELIECE348864F_CLEAN_gf_mul(prod[i], (gf) 1781);
|
|
prod[i - SYS_T + 0] ^= PQCLEAN_MCELIECE348864F_CLEAN_gf_mul(prod[i], (gf) 373);
|
|
}
|
|
|
|
for (i = 0; i < SYS_T; i++) {
|
|
out[i] = prod[i];
|
|
}
|
|
}
|
|
|