c - OpenSSL 1_1_0e BN_print_fp not working -


i using openssl 1_1_0e , cannot figure out what's wrong code:

#include <openssl/rsa.h>  int main(){      bignum          *bne = null;      unsigned long   e = rsa_f4;     rsa             *r = null;      bne = bn_new();     bn_set_word(bne,e);     r = rsa_new();      bignum *n = null;     bignum *d = null;     rsa_get0_key((const rsa *) r, (const bignum **) &n, null, (const bignum **) &d);      bn_print_fp(stdout, n);     rsa_free(r);     bn_free(bne);      return  0; }

valgrind says there invalid read of size 4:

==8066== invalid read of size 4 ==8066==    @ 0x4ef603e: bn_print (in /home/roman/dropbox/uni/rsa/my_work/library/lib/libcrypto.so.1.1) ==8066==    0x4ef662d: bn_print_fp (in /home/roman/dropbox/uni/rsa/my_work/library/lib/libcrypto.so.1.1) ==8066==    0x40093b: main (in /home/roman/dropbox/uni/rsa/my_work/sharedlibrarytest) ==8066==  address 0x10 not stack'd, malloc'd or (recently) free'd

what wrong code? looks fine me.

i cannot test piece of code directly because don't have rsa_get0_key openssl documentation says that

the n, e , d parameters can obtained calling rsa_get0_key(). if have not been set yet, *n, *e , *d set null. otherwise, set pointers respective values. these point directly internal representations of values , therefore should not freed caller.

you're calling rsa_new(); there nothing setting these bignum's in rsa object - far can read rsa_new() doesn't - how it, because generating them takes loooong time. n set null pointer; , error comes when bn_print_fp attempts read member of bignum structure @ offset 16. (i.e. *(uint32_t*)((char*)null + 16))

minimal example:

#include <openssl/rsa.h> int main(void) {     bn_print_fp(stdout, null); }

compile gcc test.c -lssl -lcrypto, use valgrind:

% valgrind ./a.out [...] ==16062== invalid read of size 4 ==16062==    @ 0x4efa5f4: bn_print (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0) ==16062==    0x4efa743: bn_print_fp (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0) ==16062==    0x108745: main (in /home/user/tmp/a.out) ==16062==  address 0x10 not stack'd, malloc'd or (recently) free'd [...]

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