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
25 RAND_priv_bytes() has the same semantics as RAND_bytes(). It is intended to
26 be used for generating values that should remain private. If using the
27 default RAND_METHOD, this function uses a separate "private" PRNG
28 instance so that a compromise of the "public" PRNG instance will not
29 affect the secrecy of these private values, as described in L<RAND(7)>
34 Always check the error return value of RAND_bytes() and
35 RAND_priv_bytes() and do not take randomness for granted: an error occurs
36 if the CSPRNG has not been seeded with enough randomness to ensure an
37 unpredictable byte sequence.
41 RAND_bytes() and RAND_priv_bytes()
42 return 1 on success, -1 if not supported by the current
43 RAND method, or 0 on other failure. The error code can be
44 obtained by L<ERR_get_error(3)>.
52 RAND_pseudo_bytes() was deprecated in OpenSSL 1.1.0; use RAND_bytes() instead.
56 RAND_priv_bytes() was added in OpenSSL 1.1.1.
64 L<RAND_priv_bytes(3)>,
71 Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
73 Licensed under the OpenSSL license (the "License"). You may not use
74 this file except in compliance with the License. You can obtain a copy
75 in the file LICENSE in the source distribution or at
76 L<https://www.openssl.org/source/license.html>.