problem with RSA_public_encrypt/RSA_private_decrypt

[Florian Millet]

Hi all,

i'd like some advice on a problem i'm getting on a very simple piece of code, 
i'm just trying to encrypt a string using rsa and then decrypt it, nothing 
complicated really. Encryption seems to works fine but when i try to decrypt, 
i'm only getting 4 characters whatever the size of the string. Those 4 
characters are good but i'd like to have the rest of the string !! 
could someone help me ?

code follows :

#include <openssl/rsa.h>

#define MYPADDING RSA_PKCS1_PADDING

char *mystring = "hello openssl";
char    *mystring_encrypted = 0;
char *mystring2 = 0;
int ret1, ret2;

int     main(void) 
{
  RAND_load_file("/dev/urandom", 16384);
  RSA *rsa = RSA_generate_key(2048, 65537, NULL, NULL);
  
  printf("RSA_size : %d\n", RSA_size(rsa));
  
  mystring_encrypted = malloc(RSA_size(rsa));
  bzero(mystring_encrypted, RSA_size(rsa));
  ret1=RSA_public_encrypt(sizeof(mystring),mystring,mystring_encrypted,rsa,MYPADDING); 
  printf("ret1 : %d\n", ret1);
  
  mystring2 = malloc(ret1);
  bzero(mystring2, ret1);
  
  ret2=RSA_private_decrypt(ret1,mystring_encrypted,mystring2,rsa,MYPADDING);
  printf("ret2 : %d [%s]\n", ret2, mystring2);
}

---
Millet Florian
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