bcrypt.h

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#pragma once
#include <string>
#include <random>
#include <stdexcept>
#include "crypto.h"

BEGIN_NAMESPACE_CRYPTO

class BCrypt
{
private:
    static const int InfoPartSize = 7;
    static const int SaltPartSize = 22;
    static const int HashPartSize = 31;
    static const int SaltSize = InfoPartSize + SaltPartSize;
    static const int HashSize = InfoPartSize + SaltPartSize + HashPartSize;

    std::random_device randomDevice;
    std::uniform_int_distribution<int> randomDist;

    std::vector<char> randBytes(unsigned int length);

public:
    BCrypt();

    std::string hash(const std::string& password, unsigned int rounds = 10);

    std::string hash(const std::string& password, std::string salt, unsigned int rounds = 10) const;

    static bool Verify(const std::string& hash, const std::string& password);

    std::string generateSalt(unsigned int size);

    std::string generateSalt(char* bytes, int size) const;
};

class BCryptException : public std::runtime_error
{
public:
    explicit BCryptException(const std::string& message);
};

class BCryptSaltSizeException : public BCryptException
{
public:
    explicit BCryptSaltSizeException(unsigned int minSaltSize);
};

END_NAMESPACE_CRYPTO