amxmodx/third_party/hashing/hashers/md5.h
2016-08-22 11:21:46 +02:00

66 lines
1.7 KiB
C++

// //////////////////////////////////////////////////////////
// md5.h
// Copyright (c) 2014 Stephan Brumme. All rights reserved.
// see http://create.stephan-brumme.com/disclaimer.html
//
#pragma once
#include "../hashing.h"
/// compute MD5 hash
/** Usage:
MD5 md5;
std::string myHash = md5("Hello World"); // std::string
std::string myHash2 = md5("How are you", 11); // arbitrary data, 11 bytes
// or in a streaming fashion:
MD5 md5;
while (more data available)
md5.add(pointer to fresh data, number of new bytes);
std::string myHash3 = md5.getHash();
*/
class MD5 //: public Hash
{
public:
/// split into 64 byte blocks (=> 512 bits), hash is 16 bytes long
enum { BlockSize = 512 / 8, HashBytes = 16 };
/// same as reset()
MD5();
/// compute MD5 of a memory block
const char* operator()(const void* data, size_t numBytes);
/// compute MD5 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 32 hex characters
const char* getHash();
/// return latest hash as bytes
void getHash(unsigned char buffer[HashBytes]);
/// restart
void reset();
private:
/// process 64 bytes
void processBlock(const void* data);
/// process everything left in the internal buffer
void processBuffer();
/// 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];
enum { HashValues = HashBytes / 4 };
/// hash, stored as integers
uint32_t m_hash[HashValues];
};