66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
/*
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* Copyright (c) 2004, Matthew P. Cashdollar <mpc@innographx.com>
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* 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 are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * 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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* * Neither the name of the author nor the names of any contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* 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
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "platform.hpp"
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#include "random.hpp"
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/*
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* Prepares the Yarrow PRNG for use
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*/
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Random::Random(void)
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{
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LMINOR << "Initalising PRNG\n";
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int rc = yarrow_start(&prng);
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assert(rc == CRYPT_OK);
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uchar_t entropy[ENTROPY_SIZE];
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size_t sz = rng_get_bytes(entropy, ENTROPY_SIZE, NULL);
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assert(sz == ENTROPY_SIZE);
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rc = yarrow_add_entropy(entropy, ENTROPY_SIZE, &prng);
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assert(rc == CRYPT_OK);
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rc = yarrow_ready(&prng);
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assert(rc == CRYPT_OK);
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}
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/*
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* Gets `size' random bytes from the PRNG
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*
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* random - space to fill with random bytes
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* size - size of `random'
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*/
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void Random::get_bytes(uchar_t* random, size_t size)
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{
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size_t sz = yarrow_read(random, size, &prng);
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assert(sz == size);
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}
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