C++ (Cpp) dv_cmp_const Examples

Example #1

File: relic_cp_ecss.c Project: Arash-Afshar/relic

int cp_ecss_ver(bn_t e, bn_t s, uint8_t *msg, int len, ec_t q) {
	bn_t n, ev, rv;
	ec_t p;
	uint8_t hash[MD_LEN];
	uint8_t m[len + FC_BYTES];
	int result = 0;

	bn_null(n);
	bn_null(ev);
	bn_null(rv);
	ec_null(p);

	TRY {
		bn_new(n);
		bn_new(ev);
		bn_new(rv);
		ec_new(p);

		ec_curve_get_ord(n);

		if (bn_sign(e) == BN_POS && bn_sign(s) == BN_POS && !bn_is_zero(s)) {
			if (bn_cmp(e, n) == CMP_LT && bn_cmp(s, n) == CMP_LT) {
				ec_mul_sim_gen(p, s, q, e);
				ec_get_x(rv, p);

				bn_mod(rv, rv, n);

				memcpy(m, msg, len);
				bn_write_bin(m + len, FC_BYTES, rv);
				md_map(hash, m, len + FC_BYTES);

				if (8 * MD_LEN > bn_bits(n)) {
					len = CEIL(bn_bits(n), 8);
					bn_read_bin(ev, hash, len);
					bn_rsh(ev, ev, 8 * MD_LEN - bn_bits(n));
				} else {
					bn_read_bin(ev, hash, MD_LEN);
				}

				bn_mod(ev, ev, n);

				result = dv_cmp_const(ev->dp, e->dp, MIN(ev->used, e->used));
				result = (result == CMP_NE ? 0 : 1);

				if (ev->used != e->used) {
					result = 0;
				}
			}
		}
	}
	CATCH_ANY {
		THROW(ERR_CAUGHT);
	}
	FINALLY {
		bn_free(n);
		bn_free(ev);
		bn_free(rv);
		ec_free(p);
	}
	return result;
}

Example #2

File: relic_fp_cmp.c Project: relic-toolkit/relic

int fp_cmp(const fp_t a, const fp_t b) {
	return dv_cmp_const(a, b, RLC_FP_DIGS);
}