BLAKE3 constexpr

blake3.cpp

#include "mk_lib_crypto_hash_stream_blake3.h"

#include <array> /* std::array */
#include <string_view> /* std::string_view */


constexpr auto blake3_constexpr(std::string_view const& str_a, char const& char_a, std::string_view const& str_b, char const& char_b)
{
	mk_lib_crypto_hash_stream_blake3_t hash{};
	std::size_t i{};
	std::array<unsigned char, 80> helper_arr{};
	mk_lib_crypto_hash_block_blake3_digest_t digest{};
	std::array<unsigned char, mk_lib_crypto_hash_block_blake3_digest_len> ret{};

	mk_lib_crypto_hash_stream_blake3_init(&hash);
	for(i = 0; i != str_a.size(); ++i){ helper_arr[i] = ((unsigned char)(str_a[i])); }
	mk_lib_crypto_hash_stream_blake3_append(&hash, helper_arr.data(), str_a.size());
	helper_arr[0] = ((unsigned char)(char_a));
	mk_lib_crypto_hash_stream_blake3_append(&hash, helper_arr.data(), 1);
	for(i = 0; i != str_b.size(); ++i){ helper_arr[i] = ((unsigned char)(str_b[i])); }
	mk_lib_crypto_hash_stream_blake3_append(&hash, helper_arr.data(), str_b.size());
	helper_arr[0] = ((unsigned char)(char_b));
	mk_lib_crypto_hash_stream_blake3_append(&hash, helper_arr.data(), 1);
	mk_lib_crypto_hash_stream_blake3_finish(&hash, &digest);
	for(i = 0; i != mk_lib_crypto_hash_block_blake3_digest_len; ++i){ mk_sl_cui_uint8_to_bi_uchar(&digest.m_uint8s[i], &ret[i]); }
	return ret;
}


int main(void)
{
	constexpr static std::string_view const str_a = "abcdef";
	constexpr static char const char_a = 'g';
	constexpr static std::string_view const str_b = "hijklmnopqrstuvwxy";
	constexpr static char const char_b = 'z';
	constexpr static auto const blake3_digest = blake3_constexpr(str_a, char_a, str_b, char_b);

	static_assert(blake3_digest[0] == 0x24, "");
	static_assert(blake3_digest[1] == 0x68, "");
	static_assert(blake3_digest[2] == 0xee, "");
	static_assert(blake3_digest[3] == 0xc8, "");
	static_assert(blake3_digest[4] == 0x89, "");
	static_assert(blake3_digest[5] == 0x4a, "");
	static_assert(blake3_digest[6] == 0xcf, "");
	static_assert(blake3_digest[7] == 0xb4, "");
}