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kaworu/BN_zero.c

Created July 18, 2018 08:16
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BN_zero.c
#include <openssl/bn.h>
int
main(void)
{
BIGNUM *z, *mz;
z = BN_new();
if (BN_zero(z) == 0)
return (1);
mz = BN_new();
if (BN_dec2bn(&mz, "-0") == 0)
return (1);
printf("BN_is_zero(BN_zero()): %s\n", BN_is_zero(z) ? "yes" : "no");
printf("BN_is_zero(BN_dec2bn(\"-0\")): %s\n", BN_is_zero(mz) ? "yes" : "no");
printf("BN_cmp(BN_zero(), BN_dec2bn(\"-0\")): %d\n", BN_cmp(z, mz));
return (0);
}
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kaworu commented Jul 18, 2018 •
edited

cc BN_zero.c -lcrypto && ./a.out

Output:

BN_is_zero(BN_zero()): yes
BN_is_zero(BN_dec2bn("-0")): yes
BN_cmp(BN_zero(), BN_dec2bn("-0")): 1

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