Dear SSLites,
Please take a look at my code. It is meant for calculating square
of a big number. To test the things I started by providing integers on
command line and tried to obtain the values back in integer. But could
not get success. Can you figure out my mistake?
#include<openssl/bn.h>
#include<string.h>
#include<math.h>
int main(int argc, char **argv) {
int i = atoi(argv[1]); //collect integer
BIGNUM *I = BN_new();
BIGNUM *II = BN_new();
BN_CTX *CTX = BN_CTX_new();
BN_CTX_init(CTX);
tmp_str = (unsigned char *)malloc(20000);
sprintf(tmp_str, "%d", i); // itoa();
BN_bin2bn(tmp_str, (int)strlen(tmp_str), I); // int to BN
if(!BN_sqr(II, I, CTX)) printf("ERROR while doing BN_sqr\n"); // BN square
BN_bn2bin(II, tmp_str); // BN to int
printf("i SQUARE = %s\n", tmp_str); // am getting garbage
BN_CTX_free(CTX);
BN_free(I);
BN_free(II);
free(tmp_str);
return 1;
}
--
Best Regards,
Vishwas.
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