5 RAND_bytes, RAND_priv_bytes, RAND_pseudo_bytes - generate random data
9 #include <openssl/rand.h>
11 int RAND_bytes(unsigned char *buf, int num);
12 int RAND_priv_bytes(unsigned char *buf, int num);
16 #if OPENSSL_API_COMPAT < 0x10100000L
17 int RAND_pseudo_bytes(unsigned char *buf, int num);
22 RAND_bytes() puts B<num> cryptographically strong pseudo-random bytes
23 into B<buf>. An error occurs if the CSPRNG has not been seeded with
24 enough randomness to ensure an unpredictable byte sequence.
26 RAND_priv_bytes() has the same semantics as RAND_bytes(). It is intended to
27 be used for generating long-term private keys. If using the default
28 RAND_METHOD, this function uses a separate instance of the PRNG so that
29 a compromise of the global generator will not affect such key generation.
33 RAND_bytes() and RAND_priv_bytes()
34 return 1 on success, -1 if not supported by the current
35 RAND method, or 0 on other failure. The error code can be
36 obtained by L<ERR_get_error(3)>.
40 RAND_pseudo_bytes() was deprecated in OpenSSL 1.1.0; use RAND_bytes() instead.
51 Copyright 2000-2018 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>.