mirror of
https://github.com/ipxe/ipxe
synced 2025-12-25 17:12:40 +03:00
8406115834
Access to the gpxe.org and etherboot.org domains and associated resources has been revoked by the registrant of the domain. Work around this problem by renaming project from gPXE to iPXE, and updating URLs to match. Also update README, LOG and COPYRIGHTS to remove obsolete information. Signed-off-by: Michael Brown <mcb30@ipxe.org>
56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/*
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* Copyright (c) 2009 Joshua Oreman <oremanj@rwcr.net>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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/** @file
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*
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* Cryptographically strong random number generator
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*
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* Currently the cryptographic part is not implemented, and this just
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* uses random().
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*/
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#include <ipxe/crypto.h>
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#include <stdlib.h>
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/**
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* Get cryptographically strong random bytes
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*
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* @v buf Buffer in which to store random bytes
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* @v len Number of random bytes to generate
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*
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* @b WARNING: This function is currently underimplemented, and does
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* not give numbers any stronger than random()!
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*/
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void get_random_bytes ( void *buf, size_t len )
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{
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u8 *bufp = buf;
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/*
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* Somewhat arbitrarily, choose the 0x00FF0000-masked byte
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* returned by random() as having good entropy. PRNGs often
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* don't provide good entropy in lower bits, and the top byte
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* might show a pattern because of sign issues.
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*/
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while ( len-- ) {
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*bufp++ = ( random() >> 16 ) & 0xFF;
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}
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}
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