5 RAND_bytes, RAND_pseudo_bytes - Generate random data
9 #include <openssl/rand.h>
11 int RAND_bytes(unsigned char *buf, int num);
13 int RAND_pseudo_bytes(unsigned char *buf, int num);
17 RAND_bytes() puts B<num> cryptographically strong pseudo-random bytes
18 into B<buf>. An error occurs if the PRNG has not been seeded with
19 enough randomness to ensure an unpredictable byte sequence.
21 RAND_pseudo_bytes() puts B<num> pseudo-random bytes into B<buf>.
22 Pseudo-random byte sequences generated by RAND_pseudo_bytes() will be
23 unique if they are of sufficient length, but are not necessarily
24 unpredictable. They can be used for non-cryptographic purposes and for
25 certain purposes in cryptographic protocols, but usually not for key
30 RAND_bytes() returns 1 on success, 0 otherwise. The error code can be
31 obtained by ERR_get_error(3). RAND_pseudo_bytes() returns 1 if the
32 bytes generated are cryptographically strong, 0 otherwise. Both
33 functions return -1 if they are not supported by the current RAND
38 rand(3), err(3), RAND_add(3)
42 RAND_bytes() is available in all versions of SSLeay and OpenSSL. It
43 has a return value since OpenSSL 0.9.5. RAND_pseudo_bytes() was added