Skip to main content
  • Home
  • login
  • Browse the archive

    swh mirror partner logo
swh logo
SoftwareHeritage
Software
Heritage
Mirror
Features
  • Search

  • Downloads

  • Save code now

  • Add forge now

  • Help

swh:1:snp:dc2a5002442a00b1c0eda7c65d04ea7455e166cd
  • Code
  • Branches (204)
  • Releases (207)
    • Branches
    • Releases
    • HEAD
    • refs/heads/OpenSSL-engine-0_9_6-stable
    • refs/heads/OpenSSL-fips-0_9_7-stable
    • refs/heads/OpenSSL-fips-0_9_8-stable
    • refs/heads/OpenSSL-fips-1_2-stable
    • refs/heads/OpenSSL-fips-2_0-dev
    • refs/heads/OpenSSL-fips-2_0-stable
    • refs/heads/OpenSSL-fips2-0_9_7-stable
    • refs/heads/OpenSSL_0_9_6-stable
    • refs/heads/OpenSSL_0_9_7-stable
    • refs/heads/OpenSSL_0_9_8-stable
    • refs/heads/OpenSSL_0_9_8fg-stable
    • refs/heads/OpenSSL_1_0_0-stable
    • refs/heads/OpenSSL_1_0_1-stable
    • refs/heads/OpenSSL_1_0_2-stable
    • refs/heads/OpenSSL_1_1_0-stable
    • refs/heads/OpenSSL_1_1_1-stable
    • refs/heads/SSLeay
    • refs/heads/feature/dtls-1.3
    • refs/heads/feature/ech
    • refs/heads/feature/quic-server
    • refs/heads/master
    • refs/heads/openssl-3.0
    • refs/heads/openssl-3.1
    • refs/heads/openssl-3.2
    • refs/heads/openssl-3.3
    • refs/heads/openssl-3.4
    • refs/heads/tls1.3-draft-18
    • refs/heads/tls1.3-draft-19
    • refs/tags/AFTER_COMPAQ_PATCH
    • refs/tags/BEFORE_COMPAQ_PATCH
    • refs/tags/BEFORE_engine
    • refs/tags/BEN_FIPS_TEST_1
    • refs/tags/BEN_FIPS_TEST_2
    • refs/tags/BEN_FIPS_TEST_3
    • refs/tags/BEN_FIPS_TEST_4
    • refs/tags/BEN_FIPS_TEST_5
    • refs/tags/BEN_FIPS_TEST_6
    • refs/tags/BEN_FIPS_TEST_7
    • refs/tags/BEN_FIPS_TEST_8
    • refs/tags/FIPS_098_TEST_1
    • refs/tags/FIPS_098_TEST_2
    • refs/tags/FIPS_098_TEST_3
    • refs/tags/FIPS_098_TEST_4
    • refs/tags/FIPS_098_TEST_5
    • refs/tags/FIPS_098_TEST_6
    • refs/tags/FIPS_098_TEST_7
    • refs/tags/FIPS_098_TEST_8
    • refs/tags/FIPS_TEST_10
    • refs/tags/FIPS_TEST_9
    • refs/tags/LEVITTE_after_const
    • refs/tags/LEVITTE_before_const
    • refs/tags/OpenSSL-engine-0_9_6
    • refs/tags/OpenSSL-engine-0_9_6-beta1
    • refs/tags/OpenSSL-engine-0_9_6-beta2
    • refs/tags/OpenSSL-engine-0_9_6-beta3
    • refs/tags/OpenSSL-engine-0_9_6a
    • refs/tags/OpenSSL-engine-0_9_6a-beta1
    • refs/tags/OpenSSL-engine-0_9_6a-beta2
    • refs/tags/OpenSSL-engine-0_9_6a-beta3
    • refs/tags/OpenSSL-engine-0_9_6b
    • refs/tags/OpenSSL-engine-0_9_6c
    • refs/tags/OpenSSL-engine-0_9_6d
    • refs/tags/OpenSSL-engine-0_9_6d-beta1
    • refs/tags/OpenSSL-engine-0_9_6e
    • refs/tags/OpenSSL-engine-0_9_6f
    • refs/tags/OpenSSL-engine-0_9_6g
    • refs/tags/OpenSSL-engine-0_9_6h
    • refs/tags/OpenSSL-engine-0_9_6i
    • refs/tags/OpenSSL-engine-0_9_6j
    • refs/tags/OpenSSL-engine-0_9_6k
    • refs/tags/OpenSSL-engine-0_9_6l
    • refs/tags/OpenSSL-engine-0_9_6m
    • refs/tags/OpenSSL-fips-1_2_0
    • refs/tags/OpenSSL-fips-1_2_1
    • refs/tags/OpenSSL-fips-1_2_2
    • refs/tags/OpenSSL-fips-1_2_3
    • refs/tags/OpenSSL-fips-2_0
    • refs/tags/OpenSSL-fips-2_0-pl1
    • refs/tags/OpenSSL-fips-2_0-rc1
    • refs/tags/OpenSSL-fips-2_0-rc2
    • refs/tags/OpenSSL-fips-2_0-rc3
    • refs/tags/OpenSSL-fips-2_0-rc4
    • refs/tags/OpenSSL-fips-2_0-rc5
    • refs/tags/OpenSSL-fips-2_0-rc6
    • refs/tags/OpenSSL-fips-2_0-rc7
    • refs/tags/OpenSSL-fips-2_0-rc8
    • refs/tags/OpenSSL-fips-2_0-rc9
    • refs/tags/OpenSSL-fips-2_0_1
    • refs/tags/OpenSSL_0_9_1c
    • refs/tags/OpenSSL_0_9_2b
    • refs/tags/OpenSSL_0_9_3
    • refs/tags/OpenSSL_0_9_3a
    • refs/tags/OpenSSL_0_9_3beta1
    • refs/tags/OpenSSL_0_9_3beta2
    • refs/tags/OpenSSL_0_9_4
    • refs/tags/OpenSSL_0_9_5
    • refs/tags/OpenSSL_0_9_5a
    • refs/tags/OpenSSL_0_9_5a-beta1
    • refs/tags/OpenSSL_0_9_5a-beta2
    • refs/tags/OpenSSL_0_9_5beta1
    • refs/tags/OpenSSL_0_9_5beta2
    • refs/tags/OpenSSL_0_9_6
    • refs/tags/OpenSSL_0_9_6-beta1
    • refs/tags/OpenSSL_0_9_6-beta2
    • refs/tags/OpenSSL_0_9_6-beta3
    • refs/tags/OpenSSL_0_9_6a
    • refs/tags/OpenSSL_0_9_6a-beta1
    • refs/tags/OpenSSL_0_9_6a-beta2
    • refs/tags/OpenSSL_0_9_6a-beta3
    • refs/tags/OpenSSL_0_9_6b
    • refs/tags/OpenSSL_0_9_6c
    • refs/tags/OpenSSL_0_9_6d
    • refs/tags/OpenSSL_0_9_6d-beta1
    • refs/tags/OpenSSL_0_9_6e
    • refs/tags/OpenSSL_0_9_6f
    • refs/tags/OpenSSL_0_9_6g
    • refs/tags/OpenSSL_0_9_6h
    • refs/tags/OpenSSL_0_9_6i
    • refs/tags/OpenSSL_0_9_6j
    • refs/tags/OpenSSL_0_9_6k
    • refs/tags/OpenSSL_0_9_6l
    • refs/tags/OpenSSL_0_9_6m
    • refs/tags/OpenSSL_0_9_7
    • refs/tags/OpenSSL_0_9_7-beta1
    • refs/tags/OpenSSL_0_9_7-beta2
    • refs/tags/OpenSSL_0_9_7-beta3
    • refs/tags/OpenSSL_0_9_7-beta4
    • refs/tags/OpenSSL_0_9_7-beta5
    • refs/tags/OpenSSL_0_9_7-beta6
    • refs/tags/OpenSSL_0_9_7a
    • refs/tags/OpenSSL_0_9_7b
    • refs/tags/OpenSSL_0_9_7c
    • refs/tags/OpenSSL_0_9_7d
    • refs/tags/OpenSSL_0_9_7e
    • refs/tags/OpenSSL_0_9_7f
    • refs/tags/OpenSSL_0_9_7g
    • refs/tags/OpenSSL_0_9_7h
    • refs/tags/OpenSSL_0_9_7i
    • refs/tags/OpenSSL_0_9_7j
    • refs/tags/OpenSSL_0_9_7k
    • refs/tags/OpenSSL_0_9_7l
    • refs/tags/OpenSSL_0_9_7m
    • refs/tags/OpenSSL_0_9_8
    • refs/tags/OpenSSL_0_9_8-beta1
    • refs/tags/OpenSSL_0_9_8-beta2
    • refs/tags/OpenSSL_0_9_8-beta3
    • refs/tags/OpenSSL_0_9_8-beta4
    • refs/tags/OpenSSL_0_9_8-beta5
    • refs/tags/OpenSSL_0_9_8-beta6
    • refs/tags/OpenSSL_0_9_8a
    • refs/tags/OpenSSL_0_9_8b
    • refs/tags/OpenSSL_0_9_8c
    • refs/tags/OpenSSL_0_9_8d
    • refs/tags/OpenSSL_0_9_8e
    • refs/tags/OpenSSL_0_9_8f
    • refs/tags/OpenSSL_0_9_8g
    • refs/tags/OpenSSL_0_9_8h
    • refs/tags/OpenSSL_0_9_8i
    • refs/tags/OpenSSL_0_9_8j
    • refs/tags/OpenSSL_0_9_8k
    • refs/tags/OpenSSL_0_9_8l
    • refs/tags/OpenSSL_0_9_8m
    • refs/tags/OpenSSL_0_9_8m-beta1
    • refs/tags/OpenSSL_0_9_8n
    • refs/tags/OpenSSL_0_9_8o
    • refs/tags/OpenSSL_0_9_8p
    • refs/tags/OpenSSL_0_9_8q
    • refs/tags/OpenSSL_0_9_8r
    • refs/tags/OpenSSL_0_9_8s
    • refs/tags/OpenSSL_0_9_8t
    • refs/tags/OpenSSL_0_9_8u
    • refs/tags/OpenSSL_0_9_8v
    • refs/tags/OpenSSL_0_9_8w
    • refs/tags/OpenSSL_0_9_8x
    • refs/tags/OpenSSL_1_0_0
    • refs/tags/OpenSSL_1_0_0-beta1
    • refs/tags/OpenSSL_1_0_0-beta2
    • refs/tags/OpenSSL_1_0_0-beta3
    • refs/tags/OpenSSL_1_0_0-beta4
    • refs/tags/OpenSSL_1_0_0-beta5
    • refs/tags/OpenSSL_1_0_0a
    • refs/tags/OpenSSL_1_0_0b
    • refs/tags/OpenSSL_1_0_0c
    • refs/tags/OpenSSL_1_0_0d
    • refs/tags/OpenSSL_1_0_0e
    • refs/tags/OpenSSL_1_0_0f
    • refs/tags/OpenSSL_1_0_0g
    • refs/tags/OpenSSL_1_0_0h
    • refs/tags/OpenSSL_1_0_0i
    • refs/tags/OpenSSL_1_0_0j
    • refs/tags/OpenSSL_1_0_1
    • refs/tags/OpenSSL_1_0_1-beta1
    • refs/tags/OpenSSL_1_0_1-beta2
    • refs/tags/OpenSSL_1_0_1-beta3
    • refs/tags/OpenSSL_1_0_1a
    • refs/tags/OpenSSL_1_0_1b
    • refs/tags/OpenSSL_1_0_1c
    • refs/tags/OpenSSL_FIPS_1_0
    • refs/tags/SSLeay_0_8_1b
    • refs/tags/SSLeay_0_9_0b
    • refs/tags/SSLeay_0_9_1b
    • refs/tags/STATE_after_zlib
    • refs/tags/STATE_before_zlib
    • refs/tags/rsaref
    • openssl-3.4.0-alpha1
    • openssl-3.3.2
    • openssl-3.3.1
    • openssl-3.3.0-beta1
    • openssl-3.3.0-alpha1
    • openssl-3.3.0
    • openssl-3.2.3
    • openssl-3.2.2
    • openssl-3.2.1
    • openssl-3.2.0-beta1
    • openssl-3.2.0-alpha2
    • openssl-3.2.0-alpha1
    • openssl-3.2.0
    • openssl-3.1.7
    • openssl-3.1.6
    • openssl-3.1.5
    • openssl-3.1.4
    • openssl-3.1.3
    • openssl-3.1.2
    • openssl-3.1.1
    • openssl-3.1.0-beta1
    • openssl-3.1.0-alpha1
    • openssl-3.1.0
    • openssl-3.0.9
    • openssl-3.0.8
    • openssl-3.0.7
    • openssl-3.0.6
    • openssl-3.0.5
    • openssl-3.0.4
    • openssl-3.0.3
    • openssl-3.0.2
    • openssl-3.0.15
    • openssl-3.0.14
    • openssl-3.0.13
    • openssl-3.0.12
    • openssl-3.0.11
    • openssl-3.0.10
    • openssl-3.0.1
    • openssl-3.0.0-beta2
    • openssl-3.0.0-beta1
    • openssl-3.0.0-alpha9
    • openssl-3.0.0-alpha8
    • openssl-3.0.0-alpha7
    • openssl-3.0.0-alpha6
    • openssl-3.0.0-alpha5
    • openssl-3.0.0-alpha4
    • openssl-3.0.0-alpha3
    • openssl-3.0.0-alpha2
    • openssl-3.0.0-alpha17
    • openssl-3.0.0-alpha16
    • openssl-3.0.0-alpha15
    • openssl-3.0.0-alpha14
    • openssl-3.0.0-alpha13
    • openssl-3.0.0-alpha12
    • openssl-3.0.0-alpha11
    • openssl-3.0.0-alpha10
    • openssl-3.0.0-alpha1
    • openssl-3.0.0
    • master-pre-reformat
    • master-pre-auto-reformat
    • master-post-reformat
    • master-post-auto-reformat
    • OpenSSL_1_1_1w
    • OpenSSL_1_1_1v
    • OpenSSL_1_1_1u
    • OpenSSL_1_1_1t
    • OpenSSL_1_1_1s
    • OpenSSL_1_1_1r
    • OpenSSL_1_1_1q
    • OpenSSL_1_1_1p
    • OpenSSL_1_1_1o
    • OpenSSL_1_1_1n
    • OpenSSL_1_1_1m
    • OpenSSL_1_1_1l
    • OpenSSL_1_1_1k
    • OpenSSL_1_1_1j
    • OpenSSL_1_1_1i
    • OpenSSL_1_1_1h
    • OpenSSL_1_1_1g
    • OpenSSL_1_1_1f
    • OpenSSL_1_1_1e
    • OpenSSL_1_1_1d
    • OpenSSL_1_1_1c
    • OpenSSL_1_1_1b
    • OpenSSL_1_1_1a
    • OpenSSL_1_1_1-pre9
    • OpenSSL_1_1_1-pre8
    • OpenSSL_1_1_1-pre7
    • OpenSSL_1_1_1-pre6
    • OpenSSL_1_1_1-pre5
    • OpenSSL_1_1_1-pre4
    • OpenSSL_1_1_1-pre3
    • OpenSSL_1_1_1-pre2
    • OpenSSL_1_1_1-pre1
    • OpenSSL_1_1_1
    • OpenSSL_1_1_0l
    • OpenSSL_1_1_0k
    • OpenSSL_1_1_0j
    • OpenSSL_1_1_0i
    • OpenSSL_1_1_0h
    • OpenSSL_1_1_0g
    • OpenSSL_1_1_0f
    • OpenSSL_1_1_0e
    • OpenSSL_1_1_0d
    • OpenSSL_1_1_0c
    • OpenSSL_1_1_0b
    • OpenSSL_1_1_0a
    • OpenSSL_1_1_0-pre6
    • OpenSSL_1_1_0-pre5
    • OpenSSL_1_1_0-pre4
    • OpenSSL_1_1_0-pre3
    • OpenSSL_1_1_0-pre2
    • OpenSSL_1_1_0-pre1
    • OpenSSL_1_1_0
    • OpenSSL_1_0_2u
    • OpenSSL_1_0_2t
    • OpenSSL_1_0_2s
    • OpenSSL_1_0_2r
    • OpenSSL_1_0_2q
    • OpenSSL_1_0_2p
    • OpenSSL_1_0_2o
    • OpenSSL_1_0_2n
    • OpenSSL_1_0_2m
    • OpenSSL_1_0_2l
    • OpenSSL_1_0_2k
    • OpenSSL_1_0_2j
    • OpenSSL_1_0_2i
    • OpenSSL_1_0_2h
    • OpenSSL_1_0_2g
    • OpenSSL_1_0_2f
    • OpenSSL_1_0_2e
    • OpenSSL_1_0_2d
    • OpenSSL_1_0_2c
    • OpenSSL_1_0_2b
    • OpenSSL_1_0_2a
    • OpenSSL_1_0_2-pre-reformat
    • OpenSSL_1_0_2-pre-auto-reformat
    • OpenSSL_1_0_2-post-reformat
    • OpenSSL_1_0_2-post-auto-reformat
    • OpenSSL_1_0_2-beta3
    • OpenSSL_1_0_2-beta2
    • OpenSSL_1_0_2-beta1
    • OpenSSL_1_0_2
    • OpenSSL_1_0_1u
    • OpenSSL_1_0_1t
    • OpenSSL_1_0_1s
    • OpenSSL_1_0_1r
    • OpenSSL_1_0_1q
    • OpenSSL_1_0_1p
    • OpenSSL_1_0_1o
    • OpenSSL_1_0_1n
    • OpenSSL_1_0_1m
    • OpenSSL_1_0_1l
    • OpenSSL_1_0_1k
    • OpenSSL_1_0_1j
    • OpenSSL_1_0_1i
    • OpenSSL_1_0_1h
    • OpenSSL_1_0_1g
    • OpenSSL_1_0_1f
    • OpenSSL_1_0_1e
    • OpenSSL_1_0_1d
    • OpenSSL_1_0_1-pre-reformat
    • OpenSSL_1_0_1-pre-auto-reformat
    • OpenSSL_1_0_1-post-reformat
    • OpenSSL_1_0_1-post-auto-reformat
    • OpenSSL_1_0_0t
    • OpenSSL_1_0_0s
    • OpenSSL_1_0_0r
    • OpenSSL_1_0_0q
    • OpenSSL_1_0_0p
    • OpenSSL_1_0_0o
    • OpenSSL_1_0_0n
    • OpenSSL_1_0_0m
    • OpenSSL_1_0_0l
    • OpenSSL_1_0_0k
    • OpenSSL_1_0_0-pre-reformat
    • OpenSSL_1_0_0-pre-auto-reformat
    • OpenSSL_1_0_0-post-reformat
    • OpenSSL_1_0_0-post-auto-reformat
    • OpenSSL_0_9_8zh
    • OpenSSL_0_9_8zg
    • OpenSSL_0_9_8zf
    • OpenSSL_0_9_8ze
    • OpenSSL_0_9_8zd
    • OpenSSL_0_9_8zc
    • OpenSSL_0_9_8zb
    • OpenSSL_0_9_8za
    • OpenSSL_0_9_8y
    • OpenSSL_0_9_8-pre-reformat
    • OpenSSL_0_9_8-pre-auto-reformat
    • OpenSSL_0_9_8-post-reformat
    • OpenSSL_0_9_8-post-auto-reformat
    • OpenSSL-fips-2_0_9
    • OpenSSL-fips-2_0_8
    • OpenSSL-fips-2_0_7
    • OpenSSL-fips-2_0_6
    • OpenSSL-fips-2_0_5
    • OpenSSL-fips-2_0_4
    • OpenSSL-fips-2_0_3
    • OpenSSL-fips-2_0_2
    • OpenSSL-fips-2_0_16
    • OpenSSL-fips-2_0_15
    • OpenSSL-fips-2_0_14
    • OpenSSL-fips-2_0_13
    • OpenSSL-fips-2_0_12
    • OpenSSL-fips-2_0_11
    • OpenSSL-fips-2_0_10
  • e7e7350
  • /
  • doc
  • /
  • man3
  • /
  • RAND_bytes.pod
Raw File
Permalinks

To reference or cite the objects present in the Software Heritage archive, permalinks based on SoftWare Hash IDentifiers (SWHIDs) must be used.
Select below a type of object currently browsed in order to display its associated SWHID and permalink.

  • content
  • directory
  • revision
  • snapshot
  • release
content badge Iframe embedding
swh:1:cnt:c44c2f967607524fb9268f797c4bfaaa184a6fbd
directory badge Iframe embedding
swh:1:dir:495d93f463bb9f15cf9353f44d622e23991c5300
revision badge
swh:1:rev:9398e4038c27d5ef15111c61e984d4d2be8a52a8
snapshot badge
swh:1:snp:dc2a5002442a00b1c0eda7c65d04ea7455e166cd
release badge
swh:1:rel:ca44a6f8fdfe8141e6d0bf2d744471cd48ba9851
Tip revision: 9398e4038c27d5ef15111c61e984d4d2be8a52a8 authored by Matt Caswell on 01 August 2023, 13:51:35 UTC
Prepare for release of 1.1.1v
Tip revision: 9398e40
RAND_bytes.pod
=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() generates B<num> random bytes using a cryptographically
secure pseudo random generator (CSPRNG) and stores them in 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

By default, the OpenSSL CSPRNG supports a security level of 256 bits, provided it
was able to seed itself from a trusted entropy source.
On all major platforms supported by OpenSSL (including the Unix-like platforms
and Windows), OpenSSL is configured to automatically seed the CSPRNG on first use
using the operating systems's random generator.

If the entropy source fails or is not available, the CSPRNG will enter an
error state and refuse to generate random bytes. For that reason, it is important
to always check the error return value of RAND_bytes() and RAND_priv_bytes() and
not take randomness for granted.

On other platforms, there might not be a trusted entropy source available
or OpenSSL might have been explicitly configured to use different entropy sources.
If you are in doubt about the quality of the entropy source, don't hesitate to ask
your operating system vendor or post a question on GitHub or the openssl-users
mailing list.

=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 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 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 COPYRIGHT

Copyright 2000-2020 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

ENEA — Copyright (C), ENEA. License: GNU AGPLv3+.
Legal notes  ::  JavaScript license information ::  Web API

back to top