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60b52453 UM |
1 | =pod |
2 | ||
3 | =head1 NAME | |
4 | ||
4d524e10 | 5 | RAND_bytes, RAND_pseudo_bytes - generate random data |
60b52453 UM |
6 | |
7 | =head1 SYNOPSIS | |
8 | ||
9 | #include <openssl/rand.h> | |
10 | ||
11 | int RAND_bytes(unsigned char *buf, int num); | |
12 | ||
302d38e3 MC |
13 | Deprecated: |
14 | ||
98186eb4 | 15 | #if OPENSSL_API_COMPAT < 0x10100000L |
60b52453 | 16 | int RAND_pseudo_bytes(unsigned char *buf, int num); |
98186eb4 | 17 | #endif |
60b52453 UM |
18 | |
19 | =head1 DESCRIPTION | |
20 | ||
720b3598 BM |
21 | RAND_bytes() puts B<num> cryptographically strong pseudo-random bytes |
22 | into B<buf>. An error occurs if the PRNG has not been seeded with | |
23 | enough randomness to ensure an unpredictable byte sequence. | |
24 | ||
302d38e3 | 25 | RAND_pseudo_bytes() has been deprecated. Users should use RAND_bytes() instead. |
720b3598 BM |
26 | RAND_pseudo_bytes() puts B<num> pseudo-random bytes into B<buf>. |
27 | Pseudo-random byte sequences generated by RAND_pseudo_bytes() will be | |
28 | unique if they are of sufficient length, but are not necessarily | |
29 | unpredictable. They can be used for non-cryptographic purposes and for | |
30 | certain purposes in cryptographic protocols, but usually not for key | |
31 | generation etc. | |
60b52453 | 32 | |
7bbce697 LJ |
33 | The contents of B<buf> is mixed into the entropy pool before retrieving |
34 | the new pseudo-random bytes unless disabled at compile time (see FAQ). | |
35 | ||
60b52453 UM |
36 | =head1 RETURN VALUES |
37 | ||
38 | RAND_bytes() returns 1 on success, 0 otherwise. The error code can be | |
9b86974e | 39 | obtained by L<ERR_get_error(3)>. RAND_pseudo_bytes() returns 1 if the |
60b52453 UM |
40 | bytes generated are cryptographically strong, 0 otherwise. Both |
41 | functions return -1 if they are not supported by the current RAND | |
42 | method. | |
43 | ||
44 | =head1 SEE ALSO | |
45 | ||
b97fdb57 | 46 | L<RAND_bytes(3)>, L<ERR_get_error(3)>, |
9b86974e | 47 | L<RAND_add(3)> |
60b52453 | 48 | |
e2f92610 RS |
49 | =head1 COPYRIGHT |
50 | ||
51 | Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. | |
52 | ||
53 | Licensed under the OpenSSL license (the "License"). You may not use | |
54 | this file except in compliance with the License. You can obtain a copy | |
55 | in the file LICENSE in the source distribution or at | |
56 | L<https://www.openssl.org/source/license.html>. | |
57 | ||
58 | =cut |