127 lines
3.8 KiB
C++
127 lines
3.8 KiB
C++
/*
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Copyright (c) 2003-2018, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_HASHER_HPP_INCLUDED
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#define TORRENT_HASHER_HPP_INCLUDED
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#include "libtorrent/peer_id.hpp"
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#include "libtorrent/config.hpp"
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#include "libtorrent/assert.hpp"
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#include "libtorrent/aux_/disable_warnings_push.hpp"
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#include <boost/cstdint.hpp>
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#include "libtorrent/aux_/disable_warnings_pop.hpp"
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#ifdef TORRENT_USE_GCRYPT
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#include <gcrypt.h>
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#elif TORRENT_USE_COMMONCRYPTO
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#include <CommonCrypto/CommonDigest.h>
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#elif defined TORRENT_USE_OPENSSL
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extern "C"
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{
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#include <openssl/sha.h>
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}
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#else
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#include "libtorrent/sha1.hpp"
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#endif
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namespace libtorrent
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{
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// this is a SHA-1 hash class.
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//
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// You use it by first instantiating it, then call ``update()`` to feed it
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// with data. i.e. you don't have to keep the entire buffer of which you want to
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// create the hash in memory. You can feed the hasher parts of it at a time. When
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// You have fed the hasher with all the data, you call ``final()`` and it
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// will return the sha1-hash of the data.
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//
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// The constructor that takes a ``char const*`` and an integer will construct the
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// sha1 context and feed it the data passed in.
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//
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// If you want to reuse the hasher object once you have created a hash, you have to
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// call ``reset()`` to reinitialize it.
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//
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// The sha1-algorithm used was implemented by Steve Reid and released as public domain.
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// For more info, see ``src/sha1.cpp``.
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class TORRENT_EXPORT hasher
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{
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public:
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hasher();
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// this is the same as default constructing followed by a call to
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// ``update(data, len)``.
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hasher(const char* data, int len);
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#ifdef TORRENT_USE_GCRYPT
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hasher(hasher const& h);
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hasher& operator=(hasher const& h);
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#endif
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// append the following bytes to what is being hashed
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hasher& update(std::string const& data) { update(data.c_str(), int(data.size())); return *this; }
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hasher& update(const char* data, int len);
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// returns the SHA-1 digest of the buffers previously passed to
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// update() and the hasher constructor.
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sha1_hash final();
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// restore the hasher state to be as if the hasher has just been
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// default constructed.
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void reset();
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~hasher();
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private:
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#ifdef TORRENT_USE_GCRYPT
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gcry_md_hd_t m_context;
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#elif TORRENT_USE_COMMONCRYPTO
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CC_SHA1_CTX m_context;
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#elif defined TORRENT_USE_OPENSSL
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SHA_CTX m_context;
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#else
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sha_ctx m_context;
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#endif
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};
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}
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#endif // TORRENT_HASHER_HPP_INCLUDED
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