79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
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// //////////////////////////////////////////////////////////
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// sha256.h
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// Copyright (c) 2014,2015 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 "hash.h"
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#include <string>
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// define fixed size integer types
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#ifdef _MSC_VER
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// Windows
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typedef unsigned __int8 uint8_t;
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typedef unsigned __int32 uint32_t;
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typedef unsigned __int64 uint64_t;
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#else
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// GCC
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#include <stdint.h>
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#endif
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/// compute SHA256 hash
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/** Usage:
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SHA256 sha256;
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std::string myHash = sha256("Hello World"); // std::string
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std::string myHash2 = sha256("How are you", 11); // arbitrary data, 11 bytes
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// or in a streaming fashion:
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SHA256 sha256;
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while (more data available)
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sha256.add(pointer to fresh data, number of new bytes);
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std::string myHash3 = sha256.getHash();
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*/
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class SHA256 //: public Hash
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{
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public:
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/// split into 64 byte blocks (=> 512 bits), hash is 32 bytes long
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enum { BlockSize = 512 / 8, HashBytes = 32 };
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/// same as reset()
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SHA256();
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/// compute SHA256 of a memory block
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std::string operator()(const void* data, size_t numBytes);
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/// compute SHA256 of a string, excluding final zero
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std::string operator()(const std::string& text);
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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 64 hex characters
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std::string getHash();
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/// return latest hash as bytes
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void getHash(unsigned char buffer[HashBytes]);
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/// restart
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void reset();
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private:
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/// process 64 bytes
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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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/// size of processed data in bytes
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uint64_t m_numBytes;
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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[BlockSize];
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enum { HashValues = HashBytes / 4 };
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/// hash, stored as integers
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uint32_t m_hash[HashValues];
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};
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