void test_num_add_sub(void) { int r = secp256k1_rand32(); secp256k1_num_t n1; secp256k1_num_t n2; random_num_order_test(&n1); /* n1 = R1 */ if (r & 1) { random_num_negate(&n1); } random_num_order_test(&n2); /* n2 = R2 */ if (r & 2) { random_num_negate(&n2); } secp256k1_num_t n1p2, n2p1, n1m2, n2m1; secp256k1_num_add(&n1p2, &n1, &n2); /* n1p2 = R1 + R2 */ secp256k1_num_add(&n2p1, &n2, &n1); /* n2p1 = R2 + R1 */ secp256k1_num_sub(&n1m2, &n1, &n2); /* n1m2 = R1 - R2 */ secp256k1_num_sub(&n2m1, &n2, &n1); /* n2m1 = R2 - R1 */ CHECK(secp256k1_num_eq(&n1p2, &n2p1)); CHECK(!secp256k1_num_eq(&n1p2, &n1m2)); secp256k1_num_negate(&n2m1); /* n2m1 = -R2 + R1 */ CHECK(secp256k1_num_eq(&n2m1, &n1m2)); CHECK(!secp256k1_num_eq(&n2m1, &n1)); secp256k1_num_add(&n2m1, &n2m1, &n2); /* n2m1 = -R2 + R1 + R2 = R1 */ CHECK(secp256k1_num_eq(&n2m1, &n1)); CHECK(!secp256k1_num_eq(&n2p1, &n1)); secp256k1_num_sub(&n2p1, &n2p1, &n2); /* n2p1 = R2 + R1 - R2 = R1 */ CHECK(secp256k1_num_eq(&n2p1, &n1)); }
void test_num_add_sub() { secp256k1_num_t n1; secp256k1_num_t n2; secp256k1_num_init(&n1); secp256k1_num_init(&n2); random_num_order_test(&n1); // n1 = R1 random_num_negate(&n1); random_num_order_test(&n2); // n2 = R2 random_num_negate(&n2); secp256k1_num_t n1p2, n2p1, n1m2, n2m1; secp256k1_num_init(&n1p2); secp256k1_num_init(&n2p1); secp256k1_num_init(&n1m2); secp256k1_num_init(&n2m1); secp256k1_num_add(&n1p2, &n1, &n2); // n1p2 = R1 + R2 secp256k1_num_add(&n2p1, &n2, &n1); // n2p1 = R2 + R1 secp256k1_num_sub(&n1m2, &n1, &n2); // n1m2 = R1 - R2 secp256k1_num_sub(&n2m1, &n2, &n1); // n2m1 = R2 - R1 assert(secp256k1_num_cmp(&n1p2, &n2p1) == 0); assert(secp256k1_num_cmp(&n1p2, &n1m2) != 0); secp256k1_num_negate(&n2m1); // n2m1 = -R2 + R1 assert(secp256k1_num_cmp(&n2m1, &n1m2) == 0); assert(secp256k1_num_cmp(&n2m1, &n1) != 0); secp256k1_num_add(&n2m1, &n2m1, &n2); // n2m1 = -R2 + R1 + R2 = R1 assert(secp256k1_num_cmp(&n2m1, &n1) == 0); assert(secp256k1_num_cmp(&n2p1, &n1) != 0); secp256k1_num_sub(&n2p1, &n2p1, &n2); // n2p1 = R2 + R1 - R2 = R1 assert(secp256k1_num_cmp(&n2p1, &n1) == 0); secp256k1_num_free(&n2m1); secp256k1_num_free(&n1m2); secp256k1_num_free(&n2p1); secp256k1_num_free(&n1p2); secp256k1_num_free(&n2); secp256k1_num_free(&n1); }
void test_num_negate(void) { secp256k1_num_t n1; secp256k1_num_t n2; random_num_order_test(&n1); /* n1 = R */ random_num_negate(&n1); secp256k1_num_copy(&n2, &n1); /* n2 = R */ secp256k1_num_sub(&n1, &n2, &n1); /* n1 = n2-n1 = 0 */ CHECK(secp256k1_num_is_zero(&n1)); secp256k1_num_copy(&n1, &n2); /* n1 = R */ secp256k1_num_negate(&n1); /* n1 = -R */ CHECK(!secp256k1_num_is_zero(&n1)); secp256k1_num_add(&n1, &n2, &n1); /* n1 = n2+n1 = 0 */ CHECK(secp256k1_num_is_zero(&n1)); secp256k1_num_copy(&n1, &n2); /* n1 = R */ secp256k1_num_negate(&n1); /* n1 = -R */ CHECK(secp256k1_num_is_neg(&n1) != secp256k1_num_is_neg(&n2)); secp256k1_num_negate(&n1); /* n1 = R */ CHECK(secp256k1_num_eq(&n1, &n2)); }
void test_num_negate() { secp256k1_num_t n1; secp256k1_num_t n2; secp256k1_num_init(&n1); secp256k1_num_init(&n2); random_num_order_test(&n1); // n1 = R random_num_negate(&n1); secp256k1_num_copy(&n2, &n1); // n2 = R secp256k1_num_sub(&n1, &n2, &n1); // n1 = n2-n1 = 0 assert(secp256k1_num_is_zero(&n1)); secp256k1_num_copy(&n1, &n2); // n1 = R secp256k1_num_negate(&n1); // n1 = -R assert(!secp256k1_num_is_zero(&n1)); secp256k1_num_add(&n1, &n2, &n1); // n1 = n2+n1 = 0 assert(secp256k1_num_is_zero(&n1)); secp256k1_num_copy(&n1, &n2); // n1 = R secp256k1_num_negate(&n1); // n1 = -R assert(secp256k1_num_is_neg(&n1) != secp256k1_num_is_neg(&n2)); secp256k1_num_negate(&n1); // n1 = R assert(secp256k1_num_cmp(&n1, &n2) == 0); assert(secp256k1_num_is_neg(&n1) == secp256k1_num_is_neg(&n2)); secp256k1_num_free(&n2); secp256k1_num_free(&n1); }