RAND_BYTES(3) OpenSSL RAND_BYTES(3)NAME
RAND_bytes, RAND_pseudo_bytes - generate random data
SYNOPSIS
#include <openssl/rand.h>
int RAND_bytes(unsigned char *buf, int num);
int RAND_pseudo_bytes(unsigned char *buf, int num);
DESCRIPTIONRAND_bytes() puts num cryptographically strong pseudo-random
bytes into buf. An error occurs if the PRNG has not been
seeded with enough randomness to ensure an unpredictable
byte sequence.
RAND_pseudo_bytes() puts num pseudo-random bytes into buf.
Pseudo-random byte sequences generated by
RAND_pseudo_bytes() will be unique if they are of sufficient
length, but are not necessarily unpredictable. They can be
used for non-cryptographic purposes and for certain purposes
in cryptographic protocols, but usually not for key genera-
tion etc.
RETURN VALUESRAND_bytes() returns 1 on success, 0 otherwise. The error
code can be obtained by ERR_get_error(3).
RAND_pseudo_bytes() returns 1 if the bytes generated are
cryptographically strong, 0 otherwise. Both functions return
-1 if they are not supported by the current RAND method.
SEE ALSOrand(3), ERR_get_error(3), RAND_add(3)HISTORYRAND_bytes() is available in all versions of SSLeay and
OpenSSL. It has a return value since OpenSSL 0.9.5.
RAND_pseudo_bytes() was added in OpenSSL 0.9.5.
MirOS BSD #10-current 2005-02-05 1
