73 lines
2.7 KiB
C
73 lines
2.7 KiB
C
/*
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* random.h -- A strong random number generator
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*
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* $Id$
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*
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* Version 0.92, last modified 21-Sep-95
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*
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* Copyright Theodore Ts'o, 1994, 1995. 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, and the entire permission notice in its entirety,
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* including the disclaimer of warranties.
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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. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* ALTERNATIVELY, this product may be distributed under the terms of
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* the GNU Public License, in which case the provisions of the GPL are
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* required INSTEAD OF the above restrictions. (This clause is
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* necessary due to a potential bad interaction between the GPL and
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* the restrictions contained in a BSD-style copyright.)
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/*
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* Many kernel routines will have a use for good random numbers,
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* for example, for truely random TCP sequence numbers, which prevent
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* certain forms of TCP spoofing attacks.
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*
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*/
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#ifndef _MACHINE_RANDOM_H_
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#define _MACHINE_RANDOM_H_ 1
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#include <sys/ioctl.h>
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#define MEM_SETIRQ _IOW('r', 1, int) /* set interrupt */
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#define MEM_CLEARIRQ _IOW('r', 2, int) /* clear interrupt */
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#define MEM_RETURNIRQ _IOR('r', 3, int) /* return interrupt */
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/* Interrupts to be used in the randomising process */
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extern u_int16_t interrupt_allowed;
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/* Exported functions */
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void rand_initialize(void);
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void add_keyboard_randomness(u_char scancode);
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void get_random_bytes(void *buf, u_int nbytes);
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u_int read_random(char *buf, u_int size);
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u_int read_random_unlimited(char *buf, u_int size);
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#endif
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