[PATCH] libpayload: Add rand() et al.

[Uwe Hermann]

See patch.

Note that these are pseudo-random numbers, do _not_ try to use them
for crypto stuff!

Uwe.

libpayload: Add rand() et al.

[Jordan Crouse]

On 08/04/08 00:41 +0200, Uwe Hermann wrote:
> See patch.
>
> Note that these are pseudo-random numbers, do _not_ try to use them
> for crypto stuff!
> Uwe.
>
> http://www.hermann-uwe.de  | http://www.holsham-traders.de
> http://www.crazy-hacks.org | http://www.unmaintained-free-software.org
> Add rand/rand_r/srand functions for generating pseudo-random bytes.
>
> Signed-off-by: Uwe Hermann

Acked-by: Jordan Crouse

libpayload: Add rand() et al.

[Uwe Hermann]

On Mon, Apr 07, 2008 at 04:52:05PM -0600, Jordan Crouse wrote:
> > Add rand/rand_r/srand functions for generating pseudo-random bytes.
> >
> > Signed-off-by: Uwe Hermann
>
> Acked-by: Jordan Crouse

Thanks, r3222.

Uwe.

libpayload: Add rand() et al.

[Jordan Crouse]

On 08/04/08 00:41 +0200, Uwe Hermann wrote:
> See patch.
>
> Note that these are pseudo-random numbers, do _not_ try to use them
> for crypto stuff!
> Uwe.
>
> http://www.hermann-uwe.de  | http://www.holsham-traders.de
> http://www.crazy-hacks.org | http://www.unmaintained-free-software.org
> Add rand/rand_r/srand functions for generating pseudo-random bytes.
>
> Signed-off-by: Uwe Hermann

Acked-by: Jordan Crouse
> Index: include/libpayload.h
>
> --- include/libpayload.h	(Revision 3220)
> +++ include/libpayload.h	(Arbeitskopie)
> @@ -53,6 +53,8 @@
>  #define BYTE_ORDER	BIG_ENDIAN
>  #endif
>
> +#define RAND_MAX 0x7fffffff
>
> /* Some NVRAM byte definitions */
>  #define NVRAM_RTC_SECONDS        0
>  #define NVRAM_RTC_MINUTES        2
> Index: LICENSES
> ===================================================================
> --- LICENSES	(Revision 3220)
> +++ LICENSES	(Arbeitskopie)
> @@ -66,6 +66,12 @@
>    Original files: lib/libalias/alias_util.c, function LibAliasInternetChecksum()
>    Current version we use: CVS revision 1.15 2004/07/06 12:13:28
>
> +* libc/rand.c: 3-clause BSD license
> Source: OpenBSD
>      http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdlib/rand.c
> Original files: src/lib/libc/stdlib/rand.c
> Current version we use: CVS revision 1.9 2005/8/8 08:05:37
> libc/memory.c: 3-clause BSD license
> Source: HelenOS, http://www.helenos.eu
>         svn checkout svn://svn.helenos.eu/HelenOS/trunk HelenOS
> Index: libc/Makefile.inc
>
> --- libc/Makefile.inc	(Revision 3220)
> +++ libc/Makefile.inc	(Arbeitskopie)
> @@ -29,3 +29,4 @@
>
> TARGETS-y += libc/malloc.o libc/printf.o libc/console.o libc/string.o
>  TARGETS-y += libc/memory.o libc/ctype.o libc/ipchecksum.o libc/lib.o
> +TARGETS-y += libc/rand.o
> Index: libc/rand.c
> ===================================================================
> --- libc/rand.c	(Revision 0)
> +++ libc/rand.c	(Revision 0)
> @@ -0,0 +1,52 @@
> +/*
> This file is part of the libpayload project.
> It was originally taken from the OpenBSD project.
> Copyright (c) 1990 The Regents of the University of California.
> All rights reserved.
> Redistribution and use in source and binary forms, with or without
> modification, are permitted provided that the following conditions
> are met:
> Redistributions of source code must retain the above copyright
> notice, this list of conditions and the following disclaimer.
> 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.
> Neither the name of the University nor the names of its contributors
> may be used to endorse or promote products derived from this software
> without specific prior written permission.
> THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
> ANY EXPRESS 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 REGENTS OR 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.
> */
>
> +#include <libpayload.h>
>
> +static unsigned int next = 1;
>
> +int rand_r(unsigned int *seed)
> +{
> *seed = *seed * 1103515245 + 12345;
> return (*seed % ((unsigned int)RAND_MAX + 1));
>
> +}
>
> +int rand(void)
> +{
> return (rand_r(&next));
>
> +}
>
> +void srand(unsigned int seed)
> +{
> next = seed;
>
> +}
>