62 lines
1.5 KiB
C++
62 lines
1.5 KiB
C++
// //////////////////////////////////////////////////////////
|
|
// sha256.h
|
|
// Copyright (c) 2014 Stephan Brumme. All rights reserved.
|
|
// see http://create.stephan-brumme.com/disclaimer.html
|
|
//
|
|
|
|
#pragma once
|
|
|
|
#include "../hashing.h"
|
|
|
|
/// compute SHA256 hash
|
|
/** Usage:
|
|
SHA256 sha256;
|
|
std::string myHash = sha256("Hello World"); // std::string
|
|
std::string myHash2 = sha256("How are you", 11); // arbitrary data, 11 bytes
|
|
|
|
// or in a streaming fashion:
|
|
|
|
SHA256 sha256;
|
|
while (more data available)
|
|
sha256.add(pointer to fresh data, number of new bytes);
|
|
std::string myHash3 = sha256.getHash();
|
|
*/
|
|
class SHA256 //: public Hash
|
|
{
|
|
public:
|
|
/// same as reset()
|
|
SHA256();
|
|
|
|
/// compute SHA256 of a memory block
|
|
const char* operator()(const void* data, size_t numBytes);
|
|
/// compute SHA256 of a string, excluding final zero
|
|
const char* operator()(const char* text, size_t size);
|
|
|
|
/// add arbitrary number of bytes
|
|
void add(const void* data, size_t numBytes);
|
|
|
|
/// return latest hash as 16 hex characters
|
|
const char* getHash();
|
|
|
|
/// restart
|
|
void reset();
|
|
|
|
private:
|
|
/// process 64 bytes
|
|
void processBlock(const void* data);
|
|
/// process everything left in the internal buffer
|
|
void processBuffer();
|
|
|
|
/// split into 64 byte blocks (=> 512 bits)
|
|
enum { BlockSize = 512 / 8, HashValues = 8 };
|
|
|
|
/// size of processed data in bytes
|
|
uint64_t m_numBytes;
|
|
/// valid bytes in m_buffer
|
|
size_t m_bufferSize;
|
|
/// bytes not processed yet
|
|
uint8_t m_buffer[BlockSize];
|
|
/// hash, stored as integers
|
|
uint32_t m_hash[8];
|
|
};
|