void test_num_get_set_hex(void) {
secp256k1_num_t n1,n2;
random_num_order_test(&n1);
char c[64];
secp256k1_num_get_hex(c, 64, &n1);
secp256k1_num_set_hex(&n2, c, 64);
CHECK(secp256k1_num_eq(&n1, &n2));
for (int i=0; i<64; i++) {
/* check whether the lower 4 bits correspond to the last hex character */
int low1 = secp256k1_num_shift(&n1, 4);
int lowh = c[63];
int low2 = ((lowh>>6)*9+(lowh-'0'))&15;
CHECK(low1 == low2);
/* shift bits off the hex representation, and compare */
memmove(c+1, c, 63);
c[0] = '0';
secp256k1_num_set_hex(&n2, c, 64);
CHECK(secp256k1_num_eq(&n1, &n2));
}
}
void test_num_get_set_hex() {
secp256k1_num_t n1,n2;
secp256k1_num_init(&n1);
secp256k1_num_init(&n2);
random_num_order_test(&n1);
char c[64];
secp256k1_num_get_hex(c, 64, &n1);
secp256k1_num_set_hex(&n2, c, 64);
assert(secp256k1_num_cmp(&n1, &n2) == 0);
for (int i=0; i<64; i++) {
// check whether the lower 4 bits correspond to the last hex character
int low1 = secp256k1_num_shift(&n1, 4);
int lowh = c[63];
int low2 = (lowh>>6)*9+(lowh-'0')&15;
assert(low1 == low2);
// shift bits off the hex representation, and compare
memmove(c+1, c, 63);
c[0] = '0';
secp256k1_num_set_hex(&n2, c, 64);
assert(secp256k1_num_cmp(&n1, &n2) == 0);
}
secp256k1_num_free(&n2);
secp256k1_num_free(&n1);
}
