mirror of
https://github.com/biergaizi/codecrypt
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65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
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/*
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* This file is part of Codecrypt.
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*
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* Copyright (C) 2013-2016 Mirek Kratochvil <exa.exa@gmail.com>
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*
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* Codecrypt is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or (at
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* your option) any later version.
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*
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* Codecrypt is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _ccr_chacha_h_
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#define _ccr_chacha_h_
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#include "types.h"
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#include "sc.h"
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#include <sys/types.h>
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#include <stdint.h>
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class chacha20 : public streamcipher
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{
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/*
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* This implementation uses Nonce as actual part of the key, as we do
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* not have any actual use for nonce-ing here. From that reason, keys
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* are 40byte (320bit). We always use the "32byte" expansion.
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*/
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public:
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uint32_t key[10];
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uint32_t counter[2];
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byte block[64];
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int blockpos; //64 = no block data allocated
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void init();
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void clear() {
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init();
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}
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void load_key (const byte*begin, const byte*end);
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byte gen();
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void gen (size_t n, byte*out);
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size_t key_size() {
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return 32 + 8;
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}
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size_t block_size() {
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return 64;
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}
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};
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#endif
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