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// Copyright 2024 Peter Dimov.
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#define _CRT_SECURE_NO_WARNINGS
#include <boost/hash2/md5.hpp>
#include <boost/hash2/sha1.hpp>
#include <boost/hash2/sha2.hpp>
#include <boost/hash2/sha3.hpp>
#include <boost/hash2/ripemd.hpp>
#include <boost/hash2/blake2.hpp>
#include <boost/mp11.hpp>
#include <array>
#include <string>
#include <cerrno>
#include <cstdio>
template<class Hash> void hash2sum( std::FILE* f, char const* fn )
{
Hash hash;
int const N = 4096;
unsigned char buffer[ N ];
for( ;; )
{
std::size_t n = std::fread( buffer, 1, N, f );
if( std::ferror( f ) )
{
std::fprintf( stderr, "'%s': read error: %s\n", fn, std::strerror( errno ) );
return;
}
if( n == 0 ) break;
hash.update( buffer, n );
}
std::string digest = to_string( hash.result() );
std::printf( "%s *%s\n", digest.c_str(), fn );
}
template<class Hash> void hash2sum( char const* fn )
{
std::FILE* f = std::fopen( fn, "rb" );
if( f == 0 )
{
std::fprintf( stderr, "'%s': open error: %s\n", fn, std::strerror( errno ) );
}
else
{
hash2sum<Hash>( f, fn );
std::fclose( f );
}
}
using namespace boost::mp11;
using namespace boost::hash2;
using hashes = mp_list<
md5_128,
sha1_160,
sha2_256,
sha2_224,
sha2_512,
sha2_384,
sha2_512_256,
sha2_512_224,
sha3_256,
sha3_224,
sha3_512,
sha3_384,
ripemd_160,
ripemd_128,
blake2b_512,
blake2s_256
>;
constexpr char const* names[] = {
"md5_128",
"sha1_160",
"sha2_256",
"sha2_224",
"sha2_512",
"sha2_384",
"sha2_512_256",
"sha2_512_224",
"sha3_256",
"sha3_224",
"sha3_512",
"sha3_384",
"ripemd_160",
"ripemd_128",
"blake2b_512",
"blake2s_256"
};
int main( int argc, char const* argv[] )
{
if( argc < 2 )
{
std::fputs( "usage: hash2sum <hash> <files...>\n", stderr );
return 2;
}
std::string hash( argv[1] );
bool found = false;
mp_for_each< mp_iota<mp_size<hashes>> >([&](auto I){
if( hash == names[I] )
{
using Hash = mp_at_c<hashes, I>;
for( int i = 2; i < argc; ++i )
{
hash2sum<Hash>( argv[i] );
}
found = true;
}
});
if( !found )
{
std::fprintf( stderr, "hash2sum: unknown hash algorithm name '%s'; use one of the following:\n\n", hash.c_str() );
for( char const* name: names )
{
std::fprintf( stderr, " %s\n", name );
}
return 1;
}
}
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