fc733ebccd
This section is based on catpages contributed by Mainichi Communications, Inc. Translated by: MYCOM team Converted by: Japanese Online Manual Project <man-jp@jp.FreeBSD.ORG> Submitted by: Kazuo Horikawa <k-horik@yk.rim.or.jp>
85 lines
2.9 KiB
Groff
85 lines
2.9 KiB
Groff
.\" $OpenBSD: arc4random.3,v 1.2 1997/04/27 22:40:25 angelos Exp $
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.\" Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Niels Provos.
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" Manual page, using -mandoc macros
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.\"
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.Dd April 15, 1997
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.Dt ARC4RANDOM 3
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.Os
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.Sh 名称
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.Nm arc4random,
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.Nm arc4random_stir,
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.Nm arc4random_addrandom
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.Nd arc4 乱数ジェネレータ
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.Sh 書式
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.Fd #include <stdlib.h>
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.Ft u_int32_t
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.Fn arc4random "void"
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.Ft void
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.Fn arc4random_stir "void"
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.Ft void
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.Fn arc4random_addrandom "unsigned char *dat" "int datlen"
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.Sh 解説
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.Fn arc4random
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関数は、arc4 暗号が採用しているキーストリームジェネレータを
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使用します。arc4 暗号は、8*8 の 8 ビット S-Box を使用します。
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S-Box は約
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.if t 2 2\u\s71700\s10\d
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.if n (2**1700)
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個の状態を取ることができます。
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.Pp
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.Fn arc4random_stir
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関数は、
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.Pa /dev/urandom
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からデータを読み取り、それを使用して
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.Fn arc4random_addrandom
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によって S-Box の順序を変えます。
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.Pp
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.Fn arc4random
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を使用する前に
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.Fn arc4random_stir
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を呼び出す必要はありません。
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.Fn arc4random
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は自動的に自分自身を初期化するからです。
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.Pp
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.Sh 関連項目
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.Xr rand 3 ,
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.Xr random 3 ,
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.Xr srandomdev 3
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.Sh 歴史
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.Pa RC4
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は、RSA Data Security, Inc. によって設計されました。
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.Pa RC4
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は、匿名で USENET にポストされ、オリジナルのコードにアクセスした人の
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いくつかのソースによって同等であることが確認されました。
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.Pa RC4
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は企業機密であったので、この暗号は
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.Pa ARC4
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と呼ばれています。
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.\" kuma
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