> From: [email protected] On Behalf Of krishnamurthy
santhanam
> Sent: Tuesday, 05 October, 2010 14:26
> memcpy is not working for the RAND_bytes. could anyone help me to
resolve the issue.
<snip>
> unsigned char keyData[BF_DEFAULT_KEY_SIZE];
> int status = FAILURE;
> printf("\n entered\n");
> printf("%d\n",BF_DEFAULT_KEY_SIZE);
> int i;
> printf("\n entered loop\n");
Aside: this is misleading; there's no loop here
> if(!RAND_bytes(keyData,BF_DEFAULT_KEY_SIZE))
> memcpy(key->str,keyData,BF_DEFAULT_KEY_SIZE);
RAND_bytes returns 1 for success and 0 or possibly -1
for error. The memcpy is executed only if RAND_bytes
failed, which it will if the PRNG isn't seeded.
You didn't explicitly seed, and whether there is
adequate default seeding can depend on your platform,
configuration and environment.
man 3 RAND_seed RAND_load_file RAND_egd
> key->length = BF_DEFAULT_KEY_SIZE;
> printf("key=\n%s\n",key->str);
> status = SUCCESS;
> printf("\n%d\n",key->length);
The indentation looks like you think these are (also)
conditioned on the if above, but they aren't.
Even if you had gotten some random data into key->str,
it is binary data and not suitable for printing with %s.
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