RAND_bytes(3)
- NetBSD Manual Pages
RAND_bytes(3) OpenSSL RAND_bytes(3)
NAME
RAND_bytes, RAND_priv_bytes, RAND_pseudo_bytes - generate random data
LIBRARY
libcrypto, -lcrypto
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).
SEE ALSO
RAND_add(3), RAND_bytes(3), RAND_priv_bytes(3), ERR_get_error(3),
RAND(7), RAND_DRBG(7)
HISTORY
· RAND_pseudo_bytes() was deprecated in OpenSSL 1.1.0; use RAND_bytes()
instead.
· The RAND_priv_bytes() function was added in OpenSSL 1.1.1.
COPYRIGHT
Copyright 2000-2019 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>.
1.1.1c 2019-06-09 RAND_bytes(3)
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