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89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
/*
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* util/random.h - thread safe random generator, which is reasonably secure.
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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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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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, 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 OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef UTIL_RANDOM_H
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#define UTIL_RANDOM_H
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/**
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* \file
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* Thread safe random functions. Similar to random(3) and initstate(3).
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*/
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/**
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* random state structure.
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*/
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struct ub_randstate {
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/** state array, malloced */
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long int* state;
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/** front ptr */
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long int* fptr;
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/** rear ptr */
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long int* rptr;
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/** rng type */
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int rand_type;
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/** rng degree */
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int rand_deg;
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/** rng sep */
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int rand_sep;
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/** rng end ptr */
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long int* end_ptr;
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};
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/**
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* Initialize a random generator state for use
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* @param seed: seed value to create state contents.
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* @param state: struct allocated by caller.
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* @param n: size of state->state. 8, 32, 64, 128, or 256 bytes.
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* @return false alloc failure.
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*/
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int ub_initstate(unsigned int seed, struct ub_randstate* state,
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unsigned long n);
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/**
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* Generate next random number from the state passed along.
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* Thread safe, so random numbers are repeatable.
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* @param state: must have been initialised with ub_initstate.
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* @return: random 31 bit value.
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*/
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long int ub_random(struct ub_randstate* state);
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/**
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* Delete the random state.
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* @param state: to delete.
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*/
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void ub_randfree(struct ub_randstate* state);
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#endif /* UTIL_RANDOM_H */
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