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/**
* @file HASHCrypt.hpp
* @brief HASHCrypt class header
* @author manzerbredes
* @date 8 Mars 2015
*
* Contain all prototypes of HASHCrypt class.
*
*/
#ifndef __HASHCrypt__
#define __HASHCrypt__
//----- std -----
#include <iostream>
#include <string>
#include <sstream>
//----- crypto++ -----
#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1
#include <crypto++/md5.h> //For MD5
#include <crypto++/hex.h> //For Hex convertion
#include <crypto++/sha.h> //For SHA
/**
* @class HASHCrypt HASHCrypt.hpp "/CryptClass/HASHCrypt.hpp"
* @brief Hashing class
* @author manzerbredes
*
* Class who handle hashing functions on a byte* parameter.
* HASHCrypt try to detect errors and throw exceptions.
* HASHCrypt use crypto++ library.
*/
class HASHCrypt{
public:
/**
* @brief Contructor
*/
HASHCrypt();
/**
* @brief Destructor
*/
~HASHCrypt();
/**
* @brief Create an MD5 over 128 bits on a digest array of bytes.
*
* @param chain : Chain to hash
* @param digest : An array of bytes (8 bits)
* @param size : Length of the array digest
*
* **Warning** digest will be modified.
* Digest must be an array of byte with 16 entries
*/
void getMD5_128(std::string chain, byte* digest, int size);
/**
* @brief Create an SHA over 256 bits on a digest array of bytes.
*
* @param chain : Chain to hash
* @param digest : An array of bytes (8 bits)
* @param size : Length of the array digest
*
* **Warning** digest will be modified.
* Digest must be an array of byte with 32 entries
*/
void getSHA_256(std::string chain, byte* digest, int size); //Return SHA_256
/**
* @brief Convert digest to a string of HEX characters
*
* @param digest : An array of bytes (8 bits)
* @param size : Length of the array digest
*
* @return a string of hex digest equivalent
*
* Digest must be an array of byte with 16 entries
*/
std::string digestToString(byte* digest, int size); //Return a string of a digest
/**
* @brief Compare 2 digest
*
* @param digest1 : An array of bytes (8 bits)
* @param digest2 : An array of bytes (8 bits)
* @param size : Length of the array digest1 or digest2
*
* @return a boolean if digest1 equals to digest2
*
* **Warning** if sizeof(digest1) != sizeof(digest 2) : segmentation fault !
* Compare the two digest.
*/
bool compareDigest(byte* digest1, byte* digest2, int size);
private:
/**
* @brief Check the digest size
*
* @param sizeRequired : Digest size expected
* @param size : Given digest size
*
* Throw an exception, and stop the programm if
* sizeRequired != size
* Use getInvalidDigestSizeError method.
*/
void checkDigestSize(int sizeRequired, int size);
/**
* @brief Make and error message.
*
* @param sizeRequired : Digest size expected
* @param size : Given digest size
*
* @return a string correspond to the error message
*
* Construct an error message with sizeRequired and size.
*/
std::string getInvalidDigestSizeError(int sizeRequired, int size);
};
#endif
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