Angel Martinez Gonzalez wrote:
Hello:
I wrote a BIGNUM into a file using the function:
int BN_print_fp(FILE *fp, const BIGNUM *a);
But, How I can read this bignum from this file?. I donīt know a openssl
function to read a bignum from a file.
Hello, you can read Bignum from file with this method,
#include <stdio.h>
#include <stdlib.h>
#include <openssl/bn.h>
int main()
{
BIGNUM *b;
FILE *f;
char buff[128]; /* must depend of Bignum size */
b = BN_new();
if (b == NULL)
return 0;
BN_add_word(b, 123456789);
f = fopen("bignum", "w");
if (f == NULL)
return 0;
BN_print_fp(f, b);
BN_free(b);
fclose(f);
/* start reading */
f = fopen("bignum", "r");
if (f == NULL)
return 0;
if (fread(buff, sizeof(char), sizeof(buff), f) <= 0)
{
fclose(f);
return 0;
}
fclose(f);
if (!BN_hex2bn(&b, buff))
return 0;
printf("BN read from file : ");
BN_print_fp(stdout, b);
printf("\n");
BN_add_word(b, 1);
printf("BN read from file + 1 : ");
BN_print_fp(stdout, b);
printf("\n");
BN_free(b);
return 1;
}
--
Ludovic FLAMENT
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