validate_hash_size.hpp

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/*
This code is written by kerukuro and released into public domain.
*/
 
#ifndef DIGESTPP_DETAIL_VALIDATE_HASH_SIZE_HPP
#define DIGESTPP_DETAIL_VALIDATE_HASH_SIZE_HPP
 
namespace digestpp
{
namespace detail
{
 
// Validate that variable hash is within the list of allowed sizes
inline void validate_hash_size(size_t hs, std::initializer_list<size_t> set)
{
    if (!hs)
        throw std::runtime_error("hash size can't be zero");
 
    if (std::find(set.begin(), set.end(), hs))
        return;
 
    throw std::runtime_error("invalid hash size");
}
 
// Validate variable hash size up to max bits
inline void validate_hash_size(size_t hs, size_t max)
{
    if (!hs)
        throw std::runtime_error("hash size can't be zero");
 
    if (hs % 8)
        throw std::runtime_error("non-byte hash sizes are not supported");
 
    if (hs > max)
        throw std::runtime_error("invalid hash size");
}
 
} // namespace detail
} // namespace digestpp
 
#endif // DIGESTPP_DETAIL_VALIDATE_HASH_SIZE_HPP