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+.\" $OpenBSD: RAND_bytes.3,v 1.7 2025/06/08 22:40:30 schwarze Exp $
+.\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
+.\"
+.\" This file was written by Ulf Moeller <ulf@openssl.org>.
+.\" Copyright (c) 2000 The OpenSSL Project. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\"
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in
+.\" the documentation and/or other materials provided with the
+.\" distribution.
+.\"
+.\" 3. All advertising materials mentioning features or use of this
+.\" software must display the following acknowledgment:
+.\" "This product includes software developed by the OpenSSL Project
+.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+.\"
+.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+.\" endorse or promote products derived from this software without
+.\" prior written permission. For written permission, please contact
+.\" openssl-core@openssl.org.
+.\"
+.\" 5. Products derived from this software may not be called "OpenSSL"
+.\" nor may "OpenSSL" appear in their names without prior written
+.\" permission of the OpenSSL Project.
+.\"
+.\" 6. Redistributions of any form whatsoever must retain the following
+.\" acknowledgment:
+.\" "This product includes software developed by the OpenSSL Project
+.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
+.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+.\" OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: June 8 2025 $
+.Dt RAND_BYTES 3
+.Os
+.Sh NAME
+.Nm RAND_bytes ,
+.Nm RAND_pseudo_bytes
+.Nd generate random data
+.Sh SYNOPSIS
+.Lb libcrypto
+.In openssl/rand.h
+.Ft int
+.Fo RAND_bytes
+.Fa "unsigned char *buf"
+.Fa "int num"
+.Fc
+.Ft int
+.Fo RAND_pseudo_bytes
+.Fa "unsigned char *buf"
+.Fa "int num"
+.Fc
+.Sh DESCRIPTION
+These functions are deprecated and only retained for compatibility
+with legacy application programs.
+Use
+.Xr arc4random_buf 3
+instead.
+.Pp
+.Fn RAND_bytes
+puts
+.Fa num
+cryptographically strong pseudo-random bytes into
+.Fa buf .
+.Pp
+.Fn RAND_pseudo_bytes
+puts
+.Fa num
+pseudo-random bytes into
+.Fa buf .
+Pseudo-random byte sequences generated by
+.Fn RAND_pseudo_bytes
+will be unique if they are of sufficient length, but are not necessarily
+unpredictable.
+They can be used for non-cryptographic purposes and for certain purposes
+in cryptographic protocols, but usually not for key generation etc.
+.Sh RETURN VALUES
+.Fn RAND_bytes
+returns 1.
+.Fn RAND_pseudo_bytes
+returns 1.
+.Sh HISTORY
+.Fn RAND_bytes
+first appeared in SSLeay 0.5.1 and has been available since
+.Ox 2.4 .
+It has a return value since OpenSSL 0.9.5 and
+.Ox 2.7 .
+.Pp
+.Fn RAND_pseudo_bytes
+first appeared in OpenSSL 0.9.5 and has been available since
+.Ox 2.7 .