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/*
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* Copyright (c) 2020 Red Hat, Inc.
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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
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* $Id: //eng/uds-releases/jasper/src/uds/random.h#2 $
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*/
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#ifndef RANDOM_H
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#define RANDOM_H
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#ifdef __KERNEL__
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#include <linux/random.h>
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#else
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#include <stdlib.h>
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#endif
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#include "compiler.h"
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#include "typeDefs.h"
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/**
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* Get random unsigned integer in a given range
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*
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* @param lo Minimum unsigned integer value
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* @param hi Maximum unsigned integer value
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*
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* @return unsigned integer in the interval [lo,hi]
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**/
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unsigned int randomInRange(unsigned int lo, unsigned int hi);
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/**
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* Special function wrapper required for compile-time assertions. This
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* function will fail to compile if RAND_MAX is not of the form 2^n - 1.
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**/
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void randomCompileTimeAssertions(void);
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/**
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* Fill bytes with random data.
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*
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* @param ptr where to store bytes
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* @param len number of bytes to write
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**/
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#ifdef __KERNEL__
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static INLINE void fillRandomly(void *ptr, size_t len)
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{
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prandom_bytes(ptr, len);
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}
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#else
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void fillRandomly(void *ptr, size_t len);
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#endif
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#ifdef __KERNEL__
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#define RAND_MAX 2147483647
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/**
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* Random number generator
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*
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* @return a random number in the rand 0 to RAND_MAX
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**/
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static INLINE long random(void)
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{
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long value;
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fillRandomly(&value, sizeof(value));
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return value & RAND_MAX;
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}
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#endif
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#endif /* RANDOM_H */
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