blake_mixin.hpp

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

#ifndef DIGESTPP_MIXINS_BLAKE_HPP
#define DIGESTPP_MIXINS_BLAKE_HPP

namespace digestpp
{

namespace mixin
{

/**
 * \brief Defines additional public functions for BLAKE algorithm.
 * \sa hasher, blake
 */
template<typename T>
class blake_mixin
{
public:

    /**
     * \brief Set salt from std::string
     *
     * Supported salt size is 16 bytes for BLAKE-224, BLAKE-256 and 32 bytes for BLAKE-384, BLAKE-512.
     *
     * \param[in] salt String with salt
     * \throw std::runtime_error if salt size is not supported.
     * \return Reference to hasher
     */
    inline hasher<T, mixin::blake_mixin>& set_salt(const std::string& salt)
    {
        return set_salt(salt.c_str(), salt.size());
    }

    /**
     * \brief Set salt from raw buffer
     *
     * Supported salt size is 16 bytes for BLAKE-224, BLAKE-256 and 32 bytes for BLAKE-384, BLAKE-512.
     *
     * \param[in] salt Pointer to salt bytes
     * \param[in] salt_len Salt length (in bytes)
     * \throw std::runtime_error if salt size is not supported.
     * \return Reference to hasher
     */
    template<typename C, typename std::enable_if<detail::is_byte<C>::value>::type* = nullptr>
    inline hasher<T, mixin::blake_mixin>& set_salt(const C* salt, size_t salt_len)
    {
        auto& blake = static_cast<hasher<T, mixin::blake_mixin>&>(*this);
        blake.provider.set_salt(reinterpret_cast<const unsigned char*>(salt), salt_len);
        blake.provider.init();
        return blake;
    }
};

} // namespace mixin

} // namespace digestpp

#endif