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/*
* The Tiger algorithm was written by Eli Biham and Ross Anderson and
* is available on the official Tiger algorithm page <https://www.cs.technion.ac.il/~biham/Reports/Tiger/>.
* The below Tiger implementation is a C++ version of their original C code.
* Permission was granted by Eli Biham to use with the following conditions;
* a) This note must be retained.
* b) The algorithm must correctly compute Tiger.
* c) The algorithm's use must be legal.
* d) The algorithm may not be exported to countries banned by law.
* e) The authors of the C code are not responsible of this use of the code,
* the software or anything else.
*/
/*
* Copyright (C) 2001-2019 Jacek Sieka, arnetheduck on gmail point com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <cstddef>
#include <cstdint>
namespace dcpp {
class TigerHash {
public:
/** Hash size in bytes */
static const size_t BITS = 192;
static const size_t BYTES = BITS / 8;
TigerHash() : pos(0) {
res[0]=_ULL(0x0123456789ABCDEF);
res[1]=_ULL(0xFEDCBA9876543210);
res[2]=_ULL(0xF096A5B4C3B2E187);
memset(&tmp, 0, sizeof(tmp));
}
~TigerHash() {
}
/** Calculates the Tiger hash of the data. */
void update(const void* data, size_t len);
/** Call once all data has been processed. */
uint8_t* finalize();
uint8_t* getResult() { return (uint8_t*) res; }
private:
enum { BLOCK_SIZE = 512/8 };
/** 512 bit blocks for the compress function */
uint8_t tmp[512/8];
/** State / final hash value */
uint64_t res[3];
/** Total number of bytes compressed */
uint64_t pos;
/** S boxes */
static uint64_t table[];
void tigerCompress(const uint64_t* data, uint64_t state[3]);
};
} // namespace dcpp
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