C++ (Cpp) COMBA_STEP示例

示例#1

文件： relic_bn_mod_low.c 项目： azahido/relic

void bn_modn_low(dig_t *c, const dig_t *a, int sa, const dig_t *m, int sm, dig_t u) {
	int i, j;
	dig_t r0, r1, r2;
	dig_t *tmp, *tmpc;
	const dig_t *tmpm;

	tmpc = c;

	r0 = r1 = r2 = 0;
	for (i = 0; i < sm; i++, tmpc++, a++) {
		tmp = c;
		tmpm = m + i;
		for (j = 0; j < i; j++, tmp++, tmpm--) {
			COMBA_STEP(r2, r1, r0, *tmp, *tmpm);
		}
		if (i < sa) {
			COMBA_ADD(r2, r1, r0, *a);
		}
		*tmpc = (dig_t)(r0 * u);
		COMBA_STEP(r2, r1, r0, *tmpc, *m);
		r0 = r1;
		r1 = r2;
		r2 = 0;
	}
	for (i = sm; i < 2 * sm - 1; i++, a++) {
		tmp = c + (i - sm + 1);
		tmpm = m + sm - 1;
		for (j = i - sm + 1; j < sm; j++, tmp++, tmpm--) {
			COMBA_STEP(r2, r1, r0, *tmp, *tmpm);
		}
		if (i < sa) {
			COMBA_ADD(r2, r1, r0, *a);
		}
		c[i - sm] = r0;
		r0 = r1;
		r1 = r2;
		r2 = 0;
	}

	if (i < sa) {
		COMBA_ADD(r2, r1, r0, *a);
	}
	c[sm - 1] = r0;
	if (r1) {
		bn_subn_low(c, c, m, sm);
	}
}

示例#2

文件： relic_fp_rdc_low.c 项目： Arash-Afshar/relic

void fp_rdcn_low2(dig_t *c, dig_t *a) {
	int i, j;
	dig_t r0, r1, r2, u;
	dig_t *m, *tmp, *tmpm, *tmpc;

	u = *(fp_prime_get_rdc());
	m = fp_prime_get();
	tmpc = c;

	r0 = r1 = r2 = 0;
	for (i = 0; i < FP_DIGS; i++, tmpc++, a++) {
		tmp = c;
		tmpm = m + i;
		for (j = 0; j < i; j++, tmp++, tmpm--) {
			COMBA_STEP(r2, r1, r0, *tmp, *tmpm);
		}
		COMBA_ADD(r2, r1, r0, *a);
		*tmpc = (dig_t)(r0 * u);
		COMBA_STEP(r2, r1, r0, *tmpc, *m);
		r0 = r1;
		r1 = r2;
		r2 = 0;
	}

	for (i = FP_DIGS; i < 2 * FP_DIGS - 1; i++, a++) {
		tmp = c + (i - FP_DIGS + 1);
		tmpm = m + FP_DIGS - 1;
		for (j = i - FP_DIGS + 1; j < FP_DIGS; j++, tmp++, tmpm--) {
			COMBA_STEP(r2, r1, r0, *tmp, *tmpm);
		}
		COMBA_ADD(r2, r1, r0, *a);
		c[i - FP_DIGS] = r0;
		r0 = r1;
		r1 = r2;
		r2 = 0;
	}
	COMBA_ADD(r2, r1, r0, *a);
	c[FP_DIGS - 1] = r0;

	if (r1 || fp_cmpn_low(c, m) != CMP_LT) {
		fp_subn_low(c, c, m);
	}
}