73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
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// //////////////////////////////////////////////////////////
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// keccak.h
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// Copyright (c) 2014 Stephan Brumme. All rights reserved.
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// see http://create.stephan-brumme.com/disclaimer.html
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//
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#pragma once
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#include "../hashing.h"
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/// compute Keccak hash (designated SHA3)
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/** Usage:
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Keccak keccak;
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std::string myHash = keccak("Hello World"); // std::string
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std::string myHash2 = keccak("How are you", 11); // arbitrary data, 11 bytes
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// or in a streaming fashion:
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Keccak keccak;
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while (more data available)
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keccak.add(pointer to fresh data, number of new bytes);
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std::string myHash3 = keccak.getHash();
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*/
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class Keccak //: public Hash
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{
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public:
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/// algorithm variants
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enum Bits { Keccak224 = 224, Keccak256 = 256, Keccak384 = 384, Keccak512 = 512 };
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/// same as reset()
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explicit Keccak(Bits bits = Keccak256);
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/// compute hash of a memory block
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const char* operator()(const void* data, size_t numBytes);
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/// compute hash of a string, excluding final zero
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const char* operator()(const char* text, size_t size);
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/// add arbitrary number of bytes
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void add(const void* data, size_t numBytes);
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/// return latest hash as hex characters
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const char* getHash();
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/// same as reset()
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void changeBits(Bits bits);
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/// restart
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void reset();
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private:
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/// process a full block
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void processBlock(const void* data);
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/// process everything left in the internal buffer
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void processBuffer();
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/// 1600 bits, stored as 25x64 bit, BlockSize is no more than 1152 bits (Keccak224)
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enum { StateSize = 1600 / (8 * 8),
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MaxBlockSize = 200 - 2 * (224 / 8) };
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/// hash
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uint64_t m_hash[StateSize];
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/// size of processed data in bytes
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uint64_t m_numBytes;
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/// block size (less or equal to MaxBlockSize)
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size_t m_blockSize;
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/// valid bytes in m_buffer
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size_t m_bufferSize;
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/// bytes not processed yet
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uint8_t m_buffer[MaxBlockSize];
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/// variant
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Bits m_bits;
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};
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