5 RAND_bytes, RAND_pseudo_bytes - generate random data
9 #include <openssl/rand.h>
11 int RAND_bytes(unsigned char *buf, int num);
15 #if OPENSSL_API_COMPAT < 0x10100000L
16 int RAND_pseudo_bytes(unsigned char *buf, int num);
21 RAND_bytes() puts B<num> cryptographically strong pseudo-random bytes
22 into B<buf>. An error occurs if the PRNG has not been seeded with
23 enough randomness to ensure an unpredictable byte sequence.
25 RAND_pseudo_bytes() has been deprecated. Users should use RAND_bytes() instead.
26 RAND_pseudo_bytes() puts B<num> pseudo-random bytes into B<buf>.
27 Pseudo-random byte sequences generated by RAND_pseudo_bytes() will be
28 unique if they are of sufficient length, but are not necessarily
29 unpredictable. They can be used for non-cryptographic purposes and for
30 certain purposes in cryptographic protocols, but usually not for key
33 The contents of B<buf> is mixed into the entropy pool before retrieving
34 the new pseudo-random bytes unless disabled at compile time (see FAQ).
38 RAND_bytes() returns 1 on success, 0 otherwise. The error code can be
39 obtained by L<ERR_get_error(3)>. RAND_pseudo_bytes() returns 1 if the
40 bytes generated are cryptographically strong, 0 otherwise. Both
41 functions return -1 if they are not supported by the current RAND
46 L<rand(3)>, L<ERR_get_error(3)>,
51 Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
53 Licensed under the OpenSSL license (the "License"). You may not use
54 this file except in compliance with the License. You can obtain a copy
55 in the file LICENSE in the source distribution or at
56 L<https://www.openssl.org/source/license.html>.