2
question about crypto++私はブーストiostreamsを使用して実装しようとしました。ブーストiostreamsフィルタを使用する（closeとnon-copyable）
#include <iostream>
#include <cryptopp/sha.h>
#include <algorithm>
#include <boost/array.hpp>
#include <boost/iostreams/concepts.hpp>
#include <boost/iostreams/operations.hpp>
#include <boost/iostreams/filtering_stream.hpp>
#include <boost/iostreams/device/file.hpp>
template<typename hash>
class sha_output_filter : public boost::iostreams::output_filter
{
hash _hash;
char _digest[hash::DIGESTSIZE];
public:
typedef char char_type;
typedef boost::iostreams::output_filter_tag category;
sha_output_filter() {}
//sha_output_filter(const sha_output_filter &) = delete;
sha_output_filter &operator=(const sha_output_filter &) = delete;
template<typename Sink>
bool put (Sink &dest, int c)
{
std::cout << "put" << std::endl;
char _c = c;
_hash.Update ((const byte *)&_c, 1);
boost::iostreams::put (dest, c);
}
template<typename Source>
void close (Source &src)
{
std::cout << "close" << std::endl;
_hash.Final(_digest);
}
boost::array<char, hash::DIGESTSIZE> digest() {
boost::array<char, hash::DIGESTSIZE> tmp;
std::copy(_digest, _digest + hash::DIGESTSIZE, tmp.begin());
return tmp;
}
};
int main()
{
sha_output_filter<CryptoPP::SHA1> outf;
boost::iostreams::filtering_ostream out;
out.set_auto_close (true);
out.push(outf);
out.push(boost::iostreams::file_sink("my_file.txt"));
std::cout << "write" << std::endl;
out.write("123\n", 4);
out.pop();
out.pop();
boost::iostreams::file_sink hash_out("hash.txt");
boost::array<char, CryptoPP::SHA1::DIGESTSIZE> digest = outf.digest();
hash_out.write(digest.begin(), CryptoPP::SHA1::DIGESTSIZE);
}
問題ありません：私は、次のコードを生成しました。しかし
In file included from /usr/include/boost/iostreams/traits.hpp:31:0,
from /usr/include/boost/iostreams/detail/dispatch.hpp:17,
from /usr/include/boost/iostreams/flush.hpp:17,
from /usr/include/boost/iostreams/close.hpp:18,
from /usr/include/boost/iostreams/operations.hpp:16,
from test.cpp:6:
test.cpp: In function ‘T boost::iostreams::detail::wrap(const T&, typename boost::disable_if<boost::iostreams::is_std_io<T> >::type*) [with T = sha_output_filter<CryptoPP::SHA1>, typename boost::disable_if<boost::iostreams::is_std_io<T> >::type = void]’:
/usr/include/boost/iostreams/stream_buffer.hpp:94:5: instantiated from ‘boost::iostreams::stream_buffer<T, Tr, Alloc, Mode>::stream_buffer(const T&, std::streamsize, std::streamsize) [with T = sha_output_filter<CryptoPP::SHA1>, Tr = std::char_traits<char>, Alloc = std::allocator<char>, Mode = boost::iostreams::output, std::streamsize = long int]’
/usr/include/boost/iostreams/chain.hpp:257:60: instantiated from ‘void boost::iostreams::detail::chain_base<Self, Ch, Tr, Alloc, Mode>::push_impl(const T&, std::streamsize, std::streamsize) [with T = sha_output_filter<CryptoPP::SHA1>, Self = boost::iostreams::chain<boost::iostreams::output, char, std::char_traits<char>, std::allocator<char> >, Ch = char, Tr = std::char_traits<char>, Alloc = std::allocator<char>, Mode = boost::iostreams::output, std::streamsize = long int]’
/usr/include/boost/iostreams/chain.hpp:216:1: instantiated from ‘void boost::iostreams::detail::chain_base<Self, Ch, Tr, Alloc, Mode>::push(const T&, std::streamsize, std::streamsize, typename boost::disable_if<boost::iostreams::is_std_io<T> >::type*) [with T = sha_output_filter<CryptoPP::SHA1>, Self = boost::iostreams::chain<boost::iostreams::output, char, std::char_traits<char>, std::allocator<char> >, Ch = char, Tr = std::char_traits<char>, Alloc = std::allocator<char>, Mode = boost::iostreams::output, std::streamsize = long int, typename boost::disable_if<boost::iostreams::is_std_io<T> >::type = void]’
/usr/include/boost/iostreams/chain.hpp:496:7: instantiated from ‘void boost::iostreams::detail::chain_client<Chain>::push_impl(const T&, std::streamsize, std::streamsize) [with T = sha_output_filter<CryptoPP::SHA1>, Chain = boost::iostreams::chain<boost::iostreams::output, char, std::char_traits<char>, std::allocator<char> >, std::streamsize = long int]’
/usr/include/boost/iostreams/chain.hpp:484:1: instantiated from ‘void boost::iostreams::detail::chain_client<Chain>::push(const T&, std::streamsize, std::streamsize, typename boost::disable_if<boost::iostreams::is_std_io<T> >::type*) [with T = sha_output_filter<CryptoPP::SHA1>, Chain = boost::iostreams::chain<boost::iostreams::output, char, std::char_traits<char>, std::allocator<char> >, std::streamsize = long int, typename boost::disable_if<boost::iostreams::is_std_io<T> >::type = void]’
test.cpp:51:16: instantiated from here
test.cpp:20:3: error: deleted function ‘sha_output_filter<hash>::sha_output_filter(const sha_output_filter<hash>&) [with hash = CryptoPP::SHA1, sha_output_filter<hash> = sha_output_filter<CryptoPP::SHA1>]’
/usr/include/boost/iostreams/detail/wrap_unwrap.hpp:53:14: error: used here
In file included from /usr/include/boost/iostreams/detail/streambuf/indirect_streambuf.hpp:23:0,
from /usr/include/boost/iostreams/stream_buffer.hpp:22,
from /usr/include/boost/iostreams/chain.hpp:35,
from /usr/include/boost/iostreams/filtering_streambuf.hpp:17,
from /usr/include/boost/iostreams/filtering_stream.hpp:22,
from test.cpp:7:
test.cpp: In constructor ‘boost::iostreams::detail::concept_adapter<T>::concept_adapter(const T&) [with T = sha_output_filter<CryptoPP::SHA1>]’:
/usr/include/boost/iostreams/detail/streambuf/indirect_streambuf.hpp:187:5: instantiated from ‘void boost::iostreams::detail::indirect_streambuf<T, Tr, Alloc, Mode>::open(const T&, std::streamsize, std::streamsize) [with T = sha_output_filter<CryptoPP::SHA1>, Tr = std::char_traits<char>, Alloc = std::allocator<char>, Mode = boost::iostreams::output, std::streamsize = long int]’
/usr/include/boost/iostreams/stream_buffer.hpp:106:13: instantiated from ‘void boost::iostreams::stream_buffer<T, Tr, Alloc, Mode>::open_impl(const T&, std::streamsize, std::streamsize) [with T = sha_output_filter<CryptoPP::SHA1>, Tr = std::char_traits<char>, Alloc = std::allocator<char>, Mode = boost::iostreams::output, std::streamsize = long int]’
/usr/include/boost/iostreams/stream_buffer.hpp:94:5: instantiated from ‘boost::iostreams::stream_buffer<T, Tr, Alloc, Mode>::stream_buffer(const T&, std::streamsize, std::streamsize) [with T = sha_output_filter<CryptoPP::SHA1>, Tr = std::char_traits<char>, Alloc = std::allocator<char>, Mode = boost::iostreams::output, std::streamsize = long int]’
/usr/include/boost/iostreams/chain.hpp:257:60: instantiated from ‘void boost::iostreams::detail::chain_base<Self, Ch, Tr, Alloc, Mode>::push_impl(const T&, std::streamsize, std::streamsize) [with T = sha_output_filter<CryptoPP::SHA1>, Self = boost::iostreams::chain<boost::iostreams::output, char, std::char_traits<char>, std::allocator<char> >, Ch = char, Tr = std::char_traits<char>, Alloc = std::allocator<char>, Mode = boost::iostreams::output, std::streamsize = long int]’
/usr/include/boost/iostreams/chain.hpp:216:1: instantiated from ‘void boost::iostreams::detail::chain_base<Self, Ch, Tr, Alloc, Mode>::push(const T&, std::streamsize, std::streamsize, typename boost::disable_if<boost::iostreams::is_std_io<T> >::type*) [with T = sha_output_filter<CryptoPP::SHA1>, Self = boost::iostreams::chain<boost::iostreams::output, char, std::char_traits<char>, std::allocator<char> >, Ch = char, Tr = std::char_traits<char>, Alloc = std::allocator<char>, Mode = boost::iostreams::output, std::streamsize = long int, typename boost::disable_if<boost::iostreams::is_std_io<T> >::type = void]’
/usr/include/boost/iostreams/chain.hpp:496:7: instantiated from ‘void boost::iostreams::detail::chain_client<Chain>::push_impl(const T&, std::streamsize, std::streamsize) [with T = sha_output_filter<CryptoPP::SHA1>, Chain = boost::iostreams::chain<boost::iostreams::output, char, std::char_traits<char>, std::allocator<char> >, std::streamsize = long int]’
/usr/include/boost/iostreams/chain.hpp:484:1: instantiated from ‘void boost::iostreams::detail::chain_client<Chain>::push(const T&, std::streamsize, std::streamsize, typename boost::disable_if<boost::iostreams::is_std_io<T> >::type*) [with T = sha_output_filter<CryptoPP::SHA1>, Chain = boost::iostreams::chain<boost::iostreams::output, char, std::char_traits<char>, std::allocator<char> >, std::streamsize = long int, typename boost::disable_if<boost::iostreams::is_std_io<T> >::type = void]’
test.cpp:51:16: instantiated from here
test.cpp:20:3: error: deleted function ‘sha_output_filter<hash>::sha_output_filter(const sha_output_filter<hash>&) [with hash = CryptoPP::SHA1, sha_output_filter<hash> = sha_output_filter<CryptoPP::SHA1>]’
/usr/include/boost/iostreams/detail/adapter/concept_adapter.hpp:67:48: error: used here
test.cpp: In copy constructor ‘boost::iostreams::detail::concept_adapter<sha_output_filter<CryptoPP::SHA1> >::concept_adapter(const boost::iostreams::detail::concept_adapter<sha_output_filter<CryptoPP::SHA1> >&)’:
/usr/include/boost/iostreams/detail/adapter/concept_adapter.hpp:38:23: instantiated from ‘void boost::iostreams::detail::optional<T>::reset(const T&) [with T = boost::iostreams::detail::concept_adapter<sha_output_filter<CryptoPP::SHA1> >]’
/usr/include/boost/iostreams/detail/streambuf/indirect_streambuf.hpp:187:5: instantiated from ‘void boost::iostreams::detail::indirect_streambuf<T, Tr, Alloc, Mode>::open(const T&, std::streamsize, std::streamsize) [with T = sha_output_filter<CryptoPP::SHA1>, Tr = std::char_traits<char>, Alloc = std::allocator<char>, Mode = boost::iostreams::output, std::streamsize = long int]’
/usr/include/boost/iostreams/stream_buffer.hpp:106:13: instantiated from ‘void boost::iostreams::stream_buffer<T, Tr, Alloc, Mode>::open_impl(const T&, std::streamsize, std::streamsize) [with T = sha_output_filter<CryptoPP::SHA1>, Tr = std::char_traits<char>, Alloc = std::allocator<char>, Mode = boost::iostreams::output, std::streamsize = long int]’
/usr/include/boost/iostreams/stream_buffer.hpp:94:5: instantiated from ‘boost::iostreams::stream_buffer<T, Tr, Alloc, Mode>::stream_buffer(const T&, std::streamsize, std::streamsize) [with T = sha_output_filter<CryptoPP::SHA1>, Tr = std::char_traits<char>, Alloc = std::allocator<char>, Mode = boost::iostreams::output, std::streamsize = long int]’
/usr/include/boost/iostreams/chain.hpp:257:60: instantiated from ‘void boost::iostreams::detail::chain_base<Self, Ch, Tr, Alloc, Mode>::push_impl(const T&, std::streamsize, std::streamsize) [with T = sha_output_filter<CryptoPP::SHA1>, Self = boost::iostreams::chain<boost::iostreams::output, char, std::char_traits<char>, std::allocator<char> >, Ch = char, Tr = std::char_traits<char>, Alloc = std::allocator<char>, Mode = boost::iostreams::output, std::streamsize = long int]’
/usr/include/boost/iostreams/chain.hpp:216:1: instantiated from ‘void boost::iostreams::detail::chain_base<Self, Ch, Tr, Alloc, Mode>::push(const T&, std::streamsize, std::streamsize, typename boost::disable_if<boost::iostreams::is_std_io<T> >::type*) [with T = sha_output_filter<CryptoPP::SHA1>, Self = boost::iostreams::chain<boost::iostreams::output, char, std::char_traits<char>, std::allocator<char> >, Ch = char, Tr = std::char_traits<char>, Alloc = std::allocator<char>, Mode = boost::iostreams::output, std::streamsize = long int, typename boost::disable_if<boost::iostreams::is_std_io<T> >::type = void]’
/usr/include/boost/iostreams/chain.hpp:496:7: instantiated from ‘void boost::iostreams::detail::chain_client<Chain>::push_impl(const T&, std::streamsize, std::streamsize) [with T = sha_output_filter<CryptoPP::SHA1>, Chain = boost::iostreams::chain<boost::iostreams::output, char, std::char_traits<char>, std::allocator<char> >, std::streamsize = long int]’
/usr/include/boost/iostreams/chain.hpp:484:1: instantiated from ‘void boost::iostreams::detail::chain_client<Chain>::push(const T&, std::streamsize, std::streamsize, typename boost::disable_if<boost::iostreams::is_std_io<T> >::type*) [with T = sha_output_filter<CryptoPP::SHA1>, Chain = boost::iostreams::chain<boost::iostreams::output, char, std::char_traits<char>, std::allocator<char> >, std::streamsize = long int, typename boost::disable_if<boost::iostreams::is_std_io<T> >::type = void]’
test.cpp:51:16: instantiated from here
test.cpp:20:3: error: deleted function ‘sha_output_filter<hash>::sha_output_filter(const sha_output_filter<hash>&) [with hash = CryptoPP::SHA1, sha_output_filter<hash> = sha_output_filter<CryptoPP::SHA1>]’
/usr/include/boost/iostreams/detail/adapter/concept_adapter.hpp:38:23: error: used here
In file included from /usr/include/boost/iostreams/detail/streambuf/direct_streambuf.hpp:26:0,
from /usr/include/boost/iostreams/stream_buffer.hpp:21,
from /usr/include/boost/iostreams/chain.hpp:35,
from /usr/include/boost/iostreams/filtering_streambuf.hpp:17,
from /usr/include/boost/iostreams/filtering_stream.hpp:22,
from test.cpp:7:
/usr/include/boost/iostreams/detail/optional.hpp: In member function ‘void boost::iostreams::detail::optional<T>::reset(const T&) [with T = boost::iostreams::detail::concept_adapter<sha_output_filter<CryptoPP::SHA1> >]’:
/usr/include/boost/iostreams/detail/optional.hpp:100:9: note: synthesized method ‘boost::iostreams::detail::concept_adapter<sha_output_filter<CryptoPP::SHA1> >::concept_adapter(const boost::iostreams::detail::concept_adapter<sha_output_filter<CryptoPP::SHA1> >&)’ first required here
boost::ref作品：1：私は"if T is a standard stream or stream buffer type, by using the templated overload of push taking a non-const reference."を述べドキュメントにもかかわらず、私のコメントを解除行場合はコピー不能sha_output_filter作る場合は動作しません。
問題はありません。 2.ストリームを閉じるには？デバッグ出力は次のようになります。
write
put
put
put
put