mirror of
https://github.com/geode-sdk/geode.git
synced 2024-12-12 00:51:13 -05:00
bbf2608ac2
The previous library we used (picosha3) returned a wrong hash for one particular file. Though this was quite rare (we only found 1 such file), it was a bug with the library regardless. The current sha3 library now comes from https://github.com/stbrumme/hash-library
73 lines
1.9 KiB
C++
73 lines
1.9 KiB
C++
// //////////////////////////////////////////////////////////
|
|
// sha3.h
|
|
// Copyright (c) 2014,2015 Stephan Brumme. All rights reserved.
|
|
// see http://create.stephan-brumme.com/disclaimer.html
|
|
//
|
|
|
|
#pragma once
|
|
|
|
//#include "hash.h"
|
|
#include <string>
|
|
|
|
#include <stdint.h>
|
|
|
|
|
|
/// compute SHA3 hash
|
|
/** Usage:
|
|
SHA3 sha3;
|
|
std::string myHash = sha3("Hello World"); // std::string
|
|
std::string myHash2 = sha3("How are you", 11); // arbitrary data, 11 bytes
|
|
|
|
// or in a streaming fashion:
|
|
|
|
SHA3 sha3;
|
|
while (more data available)
|
|
sha3.add(pointer to fresh data, number of new bytes);
|
|
std::string myHash3 = sha3.getHash();
|
|
*/
|
|
class SHA3 //: public Hash
|
|
{
|
|
public:
|
|
/// algorithm variants
|
|
enum Bits { Bits224 = 224, Bits256 = 256, Bits384 = 384, Bits512 = 512 };
|
|
|
|
/// same as reset()
|
|
explicit SHA3(Bits bits = Bits256);
|
|
|
|
/// compute hash of a memory block
|
|
std::string operator()(const void* data, size_t numBytes);
|
|
/// compute hash of a string, excluding final zero
|
|
std::string operator()(const std::string& text);
|
|
|
|
/// add arbitrary number of bytes
|
|
void add(const void* data, size_t numBytes);
|
|
|
|
/// return latest hash as hex characters
|
|
std::string getHash();
|
|
|
|
/// restart
|
|
void reset();
|
|
|
|
private:
|
|
/// process a full block
|
|
void processBlock(const void* data);
|
|
/// process everything left in the internal buffer
|
|
void processBuffer();
|
|
|
|
/// 1600 bits, stored as 25x64 bit, BlockSize is no more than 1152 bits (Keccak224)
|
|
enum { StateSize = 1600 / (8 * 8),
|
|
MaxBlockSize = 200 - 2 * (224 / 8) };
|
|
|
|
/// hash
|
|
uint64_t m_hash[StateSize];
|
|
/// size of processed data in bytes
|
|
uint64_t m_numBytes;
|
|
/// block size (less or equal to MaxBlockSize)
|
|
size_t m_blockSize;
|
|
/// valid bytes in m_buffer
|
|
size_t m_bufferSize;
|
|
/// bytes not processed yet
|
|
uint8_t m_buffer[MaxBlockSize];
|
|
/// variant
|
|
Bits m_bits;
|
|
};
|