openssl hex2bn and bn2hex will not original string, but always a long postfix

Asked Mar 26 '18 at 16:02

Active Mar 27 '18 at 16:12

Viewed 360 times

Playing with openssl BN_hex2bn and BN_bn2hex. Expecting to get the original string after hex2bn and then bn2hex, but always got a longer string, with the first past the same as the original string, but a long post fix. Followin gis the code

BIGNUM* test2 = BN_new();
BN_hex2bn(&test2, argv[1]);
char * number_str_test2 = BN_bn2hex(test2);
printf("Input hex string test2 is %s\n", number_str_test2);

Running result:

 >./a.out 10000000000000000
 >Input hex string test2 is 100000000000000030344079B87F000010

Please note the post fix 3034407....

edited Mar 27 '18 at 16:12

asked Mar 26 '18 at 16:02

user1470393

That should be `number_str_test2` instead of `number_str` in the `printf` – mnistic Mar 26 '18 at 17:07
that was a typo, there is no number_str in the code. – user1470393 Mar 27 '18 at 16:12

openssl hex2bn and bn2hex will not original string, but always a long postfix

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