/*
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* Copyright (C) 2015 Southern Storm Software, Pty Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef CRYPTO_RNG_h
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#define CRYPTO_RNG_h
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#include <inttypes.h>
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#include <stddef.h>
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class NoiseSource;
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class RNGClass
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{
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public:
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RNGClass();
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~RNGClass();
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void begin(const char *tag);
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void addNoiseSource(NoiseSource &source);
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void setAutoSaveTime(uint16_t minutes);
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void rand(uint8_t *data, size_t len);
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bool available(size_t len) const;
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void stir(const uint8_t *data, size_t len, unsigned int credit = 0);
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void save();
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void loop();
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void destroy();
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static const int SEED_SIZE = 48;
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private:
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uint32_t block[16];
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uint32_t stream[16];
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uint16_t credits : 13;
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uint16_t firstSave : 1;
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uint16_t initialized : 1;
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uint16_t trngPending : 1;
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unsigned long timer;
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unsigned long timeout;
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NoiseSource *noiseSources[4];
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uint8_t count;
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uint8_t trngPosn;
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void rekey();
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void mixTRNG();
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};
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extern RNGClass RNG;
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#endif
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