cshake_mixin.hpp

/*
This code is written by kerukuro and released into public domain.
*/

#ifndef DIGESTPP_MIXIN_SHAKE_HPP
#define DIGESTPP_MIXIN_SHAKE_HPP

namespace digestpp
{

namespace mixin
{

/**
 * \brief Defines additional public functions for cSHAKE128 and cSHAKE256.
 * \sa hasher, cshake128, cshake256
 */
template<typename T>
class cshake_mixin
{
public:
    /**
     * \brief Set NIST function name from std::string
     *
     * \param[in] function_name NIST function name string
     * \return Reference to hasher
     */
    inline hasher<T, mixin::cshake_mixin>& set_function_name(const std::string& function_name)
    {
        auto& shake = static_cast<hasher<T, mixin::cshake_mixin>&>(*this);
        shake.provider.set_function_name(function_name);
        shake.provider.init();
        return shake;
    }

    /**
     * \brief Set NIST function name from raw buffer
     *
     * \param[in] function_name Pointer to NIST function name bytes
     * \param[in] function_name_len NIST function name length (in bytes)
     * \return Reference to hasher
     */
    template<typename C, typename std::enable_if<detail::is_byte<C>::value>::type* = nullptr>
    inline hasher<T, mixin::cshake_mixin>& set_function_name(const C* function_name, size_t function_name_len)
    {
        return set_function_name(std::string(reinterpret_cast<const char*>(function_name), function_name_len));
    }

    /**
     * \brief Set customization from std::string
     *
     * \param[in] customization Customization string
     * \return Reference to hasher
     */
    inline hasher<T, mixin::cshake_mixin>& set_customization(const std::string& customization)
    {
        auto& shake = static_cast<hasher<T, mixin::cshake_mixin>&>(*this);
        shake.provider.set_customization(customization);
        shake.provider.init();
        return shake;
    }

    /**
     * \brief Set customization from raw buffer
     *
     * \param[in] customization Pointer to customization bytes
     * \param[in] customization_len Customization length (in bytes)
     * \return Reference to hasher
     */
    template<typename C, typename std::enable_if<detail::is_byte<C>::value>::type* = nullptr>
    inline hasher<T, mixin::cshake_mixin>& set_customization(const C* customization, size_t customization_len)
    {
        return set_customization(std::string(reinterpret_cast<const char*>(customization), customization_len));
    }
};

} // namespace mixin

} // namespace digestpp

#endif // DIGESTPP_MIXIN_SHAKE_HPP