I think I've found a bug in BN_sub_word. It appears
that it is not correctly setting the sign of the
resulting BIGNUM. The following program attempts to
create a BIGNUM with a value of -70, but it instead
ends up with value 70.
$ ./BNTest
Zero: 0
-70: 70
Mike
#include <openssl/bn.h>
#include <iostream>
int main (int argc, char**argv)
{
BIGNUM* neg = BN_new();
BN_init (neg);
BN_zero (neg);
char* pz = BN_bn2dec (neg);
std::cout << "Zero: " << pz << std::endl;
BN_sub_word (neg, 70);
pz = BN_bn2dec (neg);
std::cout << "-70: " << pz << std::endl;
return 0;
}
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