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=pod
=head1 NAME
RAND_bytes, RAND_priv_bytes, RAND_pseudo_bytes - generate random data
=head1 SYNOPSIS
#include <openssl/rand.h>
int RAND_bytes(unsigned char *buf, int num);
int RAND_priv_bytes(unsigned char *buf, int num);
Deprecated:
#if OPENSSL_API_COMPAT < 0x10100000L
int RAND_pseudo_bytes(unsigned char *buf, int num);
#endif
=head1 DESCRIPTION
RAND_bytes() puts B<num> cryptographically strong pseudo-random bytes
into B<buf>.
RAND_priv_bytes() has the same semantics as RAND_bytes(). It is intended to
be used for generating values that should remain private. If using the
default RAND_METHOD, this function uses a separate "private" PRNG
instance so that a compromise of the "public" PRNG instance will not
affect the secrecy of these private values, as described in L<RAND(7)>
and L<RAND_DRBG(7)>.
=head1 NOTES
Always check the error return value of RAND_bytes() and
RAND_priv_bytes() and do not take randomness for granted: an error occurs
if the CSPRNG has not been seeded with enough randomness to ensure an
unpredictable byte sequence.
=head1 RETURN VALUES
RAND_bytes() and RAND_priv_bytes()
return 1 on success, -1 if not supported by the current
RAND method, or 0 on other failure. The error code can be
obtained by L<ERR_get_error(3)>.
=head1 HISTORY
=over 2
=item *
RAND_pseudo_bytes() was deprecated in OpenSSL 1.1.0; use RAND_bytes() instead.
=item *
The RAND_priv_bytes() function was added in OpenSSL 1.1.1.
=back
=head1 SEE ALSO
L<RAND_add(3)>,
L<RAND_bytes(3)>,
L<RAND_priv_bytes(3)>,
L<ERR_get_error(3)>,
L<RAND(7)>,
L<RAND_DRBG(7)>
=head1 COPYRIGHT
Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.
=cut
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