C++ (Cpp) fe25519_setint示例

示例#1

文件： ge25519_double_scalarmult.c 项目： 0x20c24/cjdns

static void setneutral(ge25519 *r)
{
  fe25519_setint(&r->x,0);
  fe25519_setint(&r->y,1);
  fe25519_setint(&r->z,1);
  fe25519_setint(&r->t,0);
}

示例#2

文件： x25519-x86_64.c 项目： AxiomaAbsurdo/time_web_app

static void mladder(fe25519 *xr, fe25519 *zr, const uint8_t s[32]) {
  fe25519 work[5];

  work[0] = *xr;
  fe25519_setint(work + 1, 1);
  fe25519_setint(work + 2, 0);
  work[3] = *xr;
  fe25519_setint(work + 4, 1);

  int i, j;
  uint8_t prevbit = 0;

  j = 6;
  for (i = 31; i >= 0; i--) {
    while (j >= 0) {
      const uint8_t bit = 1 & (s[i] >> j);
      const uint64_t swap = bit ^ prevbit;
      prevbit = bit;
      x25519_x86_64_work_cswap(work + 1, swap);
      x25519_x86_64_ladderstep(work);
      j -= 1;
    }
    j = 7;
  }

  *xr = work[1];
  *zr = work[2];
}

示例#3

文件： fe25519_neg.c 项目： 0x20c24/cjdns

void fe25519_neg(fe25519 *r, const fe25519 *x)
{
  fe25519 t;
  fe25519_setint(&t,0);
  fe25519_sub(r,&t,x);
}