C++ (Cpp) fp_set_bit示例

示例#1

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

/*
* Compress twisted Edwards curve point by compressing the x-coordinate to its sign.
*/
void ed_pck(ed_t r, const ed_t p) {
	fp_copy(r->y, p->y);
	int b = fp_get_bit(p->x, 0);
	fp_zero(r->x);
	fp_set_bit(r->x, 0, b);
	fp_set_dig(r->z, 1);
	r->norm = 1;
}

示例#2

文件： relic_fpx_pck.c 项目： Gesine/relic

void fp2_pck(fp2_t c, fp2_t a) {
	int b = fp_get_bit(a[1], 0);
	if (fp2_test_uni(c)) {
		fp_copy(c[0], a[0]);
		fp_zero(c[1]);
		fp_set_bit(c[1], 0, b);
	} else {
		fp2_copy(c, a);
	}
}

示例#3

文件： relic_fpx_util.c 项目： Gesine/relic

void fp2_read_bin(fp2_t a, uint8_t *bin, int len) {
	if (len != FP_BYTES + 1 && len != 2 * FP_BYTES) {
		THROW(ERR_NO_BUFFER);
	}
	if (len == FP_BYTES + 1) {
		fp_read_bin(a[0], bin, FP_BYTES);
		fp_set_bit(a[1], 0, bin[FP_BYTES]);
		fp2_upk(a, a);
	}
	if (len == 2 * FP_BYTES) {
		fp_read_bin(a[0], bin, FP_BYTES);
		fp_read_bin(a[1], bin + FP_BYTES, FP_BYTES);
	}
}

示例#4

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

void ed_read_bin(ed_t a, const uint8_t *bin, int len) {
	if (len == 1) {
		if (bin[0] == 0) {
			ed_set_infty(a);
			return;
		} else {
			THROW(ERR_NO_BUFFER);
			return;
		}
	}

	if (len != (FP_BYTES + 1) && len != (2 * FP_BYTES + 1)) {
		THROW(ERR_NO_BUFFER);
		return;
	}

	a->norm = 1;
	fp_set_dig(a->z, 1);
	fp_read_bin(a->y, bin + 1, FP_BYTES);
	if (len == FP_BYTES + 1) {
		switch(bin[0]) {
			case 2:
				fp_zero(a->x);
				break;
			case 3:
				fp_zero(a->x);
				fp_set_bit(a->x, 0, 1);
				break;
			default:
				THROW(ERR_NO_VALID);
				break;
		}
		ed_upk(a, a);
	}

	if (len == 2 * FP_BYTES + 1) {
		if (bin[0] == 4) {
			fp_read_bin(a->x, bin + FP_BYTES + 1, FP_BYTES);
		} else {
			THROW(ERR_NO_VALID);
		}
	}

#if ED_ADD == EXTND
	ed_projc_to_extnd(a, a->x, a->y, a->z);
#endif
}

示例#5

文件： relic_ep2_util.c 项目： Arash-Afshar/relic

void ep2_read_bin(ep2_t a, uint8_t *bin, int len) {
	if (len == 1) {
		if (bin[0] == 0) {
			ep2_set_infty(a);
			return;
		} else {
			THROW(ERR_NO_BUFFER);
			return;
		}
	}

	if (len != (2 * FP_BYTES + 1) && len != (4 * FP_BYTES + 1)) {
		THROW(ERR_NO_BUFFER);
		return;
	}

	a->norm = 1;
	fp_set_dig(a->z[0], 1);
	fp_zero(a->z[1]);
	fp2_read_bin(a->x, bin + 1, 2 * FP_BYTES);
	if (len == 2 * FP_BYTES + 1) {
		switch(bin[0]) {
			case 2:
				fp2_zero(a->y);
				break;
			case 3:
				fp2_zero(a->y);
				fp_set_bit(a->y[0], 0, 1);
				fp_zero(a->y[1]);
				break;
			default:
				THROW(ERR_NO_VALID);
				break;
		}
		ep2_upk(a, a);
	}

	if (len == 4 * FP_BYTES + 1) {
		if (bin[0] == 4) {
			fp2_read_bin(a->y, bin + 2 * FP_BYTES + 1, 2 * FP_BYTES);
		} else {
			THROW(ERR_NO_VALID);
		}
	}
}