/*
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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_CHACHA_h
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#define CRYPTO_CHACHA_h
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#include "Cipher.h"
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class ChaChaPoly;
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class ChaCha : public Cipher
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{
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public:
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explicit ChaCha(uint8_t numRounds = 20);
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virtual ~ChaCha();
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size_t keySize() const;
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size_t ivSize() const;
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uint8_t numRounds() const { return rounds; }
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void setNumRounds(uint8_t numRounds) { rounds = numRounds; }
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bool setKey(const uint8_t *key, size_t len);
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bool setIV(const uint8_t *iv, size_t len);
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bool setCounter(const uint8_t *counter, size_t len);
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void encrypt(uint8_t *output, const uint8_t *input, size_t len);
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void decrypt(uint8_t *output, const uint8_t *input, size_t len);
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void clear();
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static void hashCore(uint32_t *output, const uint32_t *input, uint8_t rounds);
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private:
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uint8_t block[64];
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uint8_t stream[64];
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uint8_t rounds;
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uint8_t posn;
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void keystreamBlock(uint32_t *output);
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friend class ChaChaPoly;
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};
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#endif
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