-rw-r--r-- 769 lib25519-20220726/crypto_sign/ed25519/amd64-51-30k/fe25519_sub.c raw
#include "fe25519.h" void fe25519_sub(fe25519 *r, const fe25519 *x, const fe25519 *y) { fe25519 yt = *y; /* Not required for reduced input */ unsigned long long t; t = yt.v[0] >> 51; yt.v[0] &= 2251799813685247; yt.v[1] += t; t = yt.v[1] >> 51; yt.v[1] &= 2251799813685247; yt.v[2] += t; t = yt.v[2] >> 51; yt.v[2] &= 2251799813685247; yt.v[3] += t; t = yt.v[3] >> 51; yt.v[3] &= 2251799813685247; yt.v[4] += t; t = yt.v[4] >> 51; yt.v[4] &= 2251799813685247; yt.v[0] += 19*t; r->v[0] = x->v[0] + 0xFFFFFFFFFFFDA - yt.v[0]; r->v[1] = x->v[1] + 0xFFFFFFFFFFFFE - yt.v[1]; r->v[2] = x->v[2] + 0xFFFFFFFFFFFFE - yt.v[2]; r->v[3] = x->v[3] + 0xFFFFFFFFFFFFE - yt.v[3]; r->v[4] = x->v[4] + 0xFFFFFFFFFFFFE - yt.v[4]; }