1.\" $OpenBSD: arc4random.3,v 1.2 1997/04/27 22:40:25 angelos Exp $
2.\" Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
3.\" All rights reserved.
4.\"
5.\" Redistribution and use in source and binary forms, with or without
6.\" modification, are permitted provided that the following conditions
7.\" are met:
8.\" 1. Redistributions of source code must retain the above copyright
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23.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29.\"
30.\" Manual page, using -mandoc macros
31.\" $FreeBSD: head/lib/libc/gen/arc4random.3 180657 2008-07-21 13:52:06Z ache $
32.\"
33.Dd April 15, 1997
34.Dt ARC4RANDOM 3
35.Os
36.Sh NAME
37.Nm arc4random ,
38.Nm arc4random_buf ,
39.Nm arc4random_stir ,
40.Nm arc4random_addrandom
41.Nd arc4 random number generator
42.Sh LIBRARY
43.Lb libc
44.Sh SYNOPSIS
45.In stdlib.h
46.Ft u_int32_t
47.Fn arc4random "void"
48.Ft void
49.Fn arc4random_buf "void *buf" "size_t nbytes"
50.Ft void
51.Fn arc4random_stir "void"
52.Ft void
53.Fn arc4random_addrandom "unsigned char *dat" "int datlen"
54.Sh DESCRIPTION
55The
56.Fn arc4random
57function uses the key stream generator employed by the
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73.Pp
74.Fn arc4random_buf
75function fills the region
76.Fa buf
77of length
78.Fa nbytes
79with ARC4-derived random data.
80.Pp
81The
82.Fn arc4random_stir
83function reads data from
84.Pa /dev/urandom
85and uses it to permute the S-Boxes via
86.Fn arc4random_addrandom .
87.Pp
88There is no need to call
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2.\" Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
3.\" All rights reserved.
4.\"
5.\" Redistribution and use in source and binary forms, with or without
6.\" modification, are permitted provided that the following conditions
7.\" are met:
8.\" 1. Redistributions of source code must retain the above copyright
--- 14 unchanged lines hidden (view full) ---
23.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29.\"
30.\" Manual page, using -mandoc macros
31.\" $FreeBSD: head/lib/libc/gen/arc4random.3 180657 2008-07-21 13:52:06Z ache $
32.\"
33.Dd April 15, 1997
34.Dt ARC4RANDOM 3
35.Os
36.Sh NAME
37.Nm arc4random ,
38.Nm arc4random_buf ,
39.Nm arc4random_stir ,
40.Nm arc4random_addrandom
41.Nd arc4 random number generator
42.Sh LIBRARY
43.Lb libc
44.Sh SYNOPSIS
45.In stdlib.h
46.Ft u_int32_t
47.Fn arc4random "void"
48.Ft void
49.Fn arc4random_buf "void *buf" "size_t nbytes"
50.Ft void
51.Fn arc4random_stir "void"
52.Ft void
53.Fn arc4random_addrandom "unsigned char *dat" "int datlen"
54.Sh DESCRIPTION
55The
56.Fn arc4random
57function uses the key stream generator employed by the
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73.Pp
74.Fn arc4random_buf
75function fills the region
76.Fa buf
77of length
78.Fa nbytes
79with ARC4-derived random data.
80.Pp
81The
82.Fn arc4random_stir
83function reads data from
84.Pa /dev/urandom
85and uses it to permute the S-Boxes via
86.Fn arc4random_addrandom .
87.Pp
88There is no need to call
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