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RAND_BYTES(3)			    OpenSSL			 RAND_BYTES(3)

NAME
       RAND_bytes, RAND_priv_bytes, RAND_pseudo_bytes -	generate random	data

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

DESCRIPTION
       RAND_bytes() puts num cryptographically strong pseudo-random bytes into
       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 RAND(7) and	RAND_DRBG(7).

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.

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 ERR_get_error(3).

HISTORY
       o RAND_pseudo_bytes() was deprecated in OpenSSL 1.1.0; use RAND_bytes()
	 instead.

       o RAND_priv_bytes() was added in	OpenSSL	1.1.1.

SEE ALSO
       RAND_add(3), RAND_bytes(3), RAND_priv_bytes(3), ERR_get_error(3),
       RAND(7),	RAND_DRBG(7)

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
       <https://www.openssl.org/source/license.html>.

1.1.1a				  2018-11-20			 RAND_BYTES(3)

NAME | SYNOPSIS | DESCRIPTION | NOTES | RETURN VALUES | HISTORY | SEE ALSO | COPYRIGHT

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