-rw-r--r-- 733 lib25519-20230630/crypto_nG/merged25519/amd64-64/fe25519_cmov.c raw
// linker define fe25519_cmov #include "fe25519.h" void fe25519_cmov(fe25519 *f,const fe25519 *g,unsigned char b) { unsigned long long f0 = f->v[0]; unsigned long long f1 = f->v[1]; unsigned long long f2 = f->v[2]; unsigned long long f3 = f->v[3]; unsigned long long g0 = g->v[0]; unsigned long long g1 = g->v[1]; unsigned long long g2 = g->v[2]; unsigned long long g3 = g->v[3]; unsigned long long x0 = f0 ^ g0; unsigned long long x1 = f1 ^ g1; unsigned long long x2 = f2 ^ g2; unsigned long long x3 = f3 ^ g3; unsigned long long mask = -(unsigned long long) b; x0 &= mask; x1 &= mask; x2 &= mask; x3 &= mask; f->v[0] = f0 ^ x0; f->v[1] = f1 ^ x1; f->v[2] = f2 ^ x2; f->v[3] = f3 ^ x3; }