1.\" $OpenBSD: RAND_load_file.3,v 1.6 2018/03/27 17:35:50 schwarze Exp $ 2.\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100 3.\" 4.\" This file was written by Ulf Moeller <ulf@openssl.org>. 5.\" Copyright (c) 2000, 2001 The OpenSSL Project. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in 16.\" the documentation and/or other materials provided with the 17.\" distribution. 18.\" 19.\" 3. All advertising materials mentioning features or use of this 20.\" software must display the following acknowledgment: 21.\" "This product includes software developed by the OpenSSL Project 22.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 23.\" 24.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 25.\" endorse or promote products derived from this software without 26.\" prior written permission. For written permission, please contact 27.\" openssl-core@openssl.org. 28.\" 29.\" 5. Products derived from this software may not be called "OpenSSL" 30.\" nor may "OpenSSL" appear in their names without prior written 31.\" permission of the OpenSSL Project. 32.\" 33.\" 6. Redistributions of any form whatsoever must retain the following 34.\" acknowledgment: 35.\" "This product includes software developed by the OpenSSL Project 36.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)" 37.\" 38.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 39.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 41.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 42.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 43.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 44.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 45.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 47.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 48.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 49.\" OF THE POSSIBILITY OF SUCH DAMAGE. 50.\" 51.Dd $Mdocdate: March 27 2018 $ 52.Dt RAND_LOAD_FILE 3 53.Os 54.Sh NAME 55.Nm RAND_file_name , 56.Nm RAND_load_file , 57.Nm RAND_write_file 58.Nd PRNG seed file 59.Sh SYNOPSIS 60.In openssl/rand.h 61.Ft const char * 62.Fo RAND_file_name 63.Fa "char *buf" 64.Fa "size_t num" 65.Fc 66.Ft int 67.Fo RAND_load_file 68.Fa "const char *filename" 69.Fa "long max_bytes" 70.Fc 71.Ft int 72.Fo RAND_write_file 73.Fa "const char *filename" 74.Fc 75.Sh DESCRIPTION 76.Fn RAND_file_name 77returns a default path for the random seed file. 78.Fa buf 79points to a buffer of size 80.Fa num 81in which to store the filename. 82If 83.Fa num 84is too small for the path name, an error occurs. 85.Pp 86.Fn RAND_load_file 87used to allow for the state of the random number generator to be 88controlled by external sources. 89It is kept for ABI compatibility but is no longer functional, and should 90not be used in new programs. 91.Pp 92.Fn RAND_write_file 93writes a number of random bytes (currently 1024) to file 94.Fa filename . 95.Sh RETURN VALUES 96.Fn RAND_load_file 97returns 98.Fa max_bytes , 99or a bogus positive value if 100.Fa max_bytes 101is -1. 102.Pp 103.Fn RAND_write_file 104returns the number of bytes written, or a number less than or equal 105to 1 if an error occurs. 106.Pp 107.Fn RAND_file_name 108returns a pointer to 109.Fa buf 110on success or 111.Dv NULL 112on error. 113.Sh HISTORY 114.Fn RAND_load_file , 115.Fn RAND_write_file , 116and 117.Fn RAND_file_name 118first appeared in SSLeay 0.5.1 and have been available since 119.Ox 2.4 . 120