157 lines
3.8 KiB
C++
157 lines
3.8 KiB
C++
/*
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Copyright (c) 2003-2012, 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 <boost/cstdint.hpp>
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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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#ifdef TORRENT_USE_GCRYPT
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#include <gcrypt.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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// from sha1.cpp
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struct TORRENT_EXTRA_EXPORT SHA_CTX
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{
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boost::uint32_t state[5];
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boost::uint32_t count[2];
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boost::uint8_t buffer[64];
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};
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TORRENT_EXTRA_EXPORT void SHA1_Init(SHA_CTX* context);
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TORRENT_EXTRA_EXPORT void SHA1_Update(SHA_CTX* context, boost::uint8_t const* data, boost::uint32_t len);
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TORRENT_EXTRA_EXPORT void SHA1_Final(boost::uint8_t* digest, SHA_CTX* context);
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#endif
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namespace libtorrent
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{
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class hasher
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{
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public:
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hasher()
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{
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#ifdef TORRENT_USE_GCRYPT
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gcry_md_open(&m_context, GCRY_MD_SHA1, 0);
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#else
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SHA1_Init(&m_context);
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#endif
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}
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hasher(const char* data, int len)
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{
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TORRENT_ASSERT(data != 0);
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TORRENT_ASSERT(len > 0);
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#ifdef TORRENT_USE_GCRYPT
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gcry_md_open(&m_context, GCRY_MD_SHA1, 0);
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gcry_md_write(m_context, data, len);
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#else
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SHA1_Init(&m_context);
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SHA1_Update(&m_context, reinterpret_cast<unsigned char const*>(data), len);
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#endif
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}
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#ifdef TORRENT_USE_GCRYPT
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hasher(hasher const& h)
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{
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gcry_md_copy(&m_context, h.m_context);
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}
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hasher& operator=(hasher const& h)
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{
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gcry_md_close(m_context);
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gcry_md_copy(&m_context, h.m_context);
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return *this;
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}
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#endif
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void update(std::string const& data) { update(data.c_str(), data.size()); }
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void update(const char* data, int len)
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{
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TORRENT_ASSERT(data != 0);
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TORRENT_ASSERT(len > 0);
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#ifdef TORRENT_USE_GCRYPT
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gcry_md_write(m_context, data, len);
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#else
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SHA1_Update(&m_context, reinterpret_cast<unsigned char const*>(data), len);
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#endif
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}
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sha1_hash final()
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{
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sha1_hash digest;
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#ifdef TORRENT_USE_GCRYPT
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gcry_md_final(m_context);
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digest.assign((const char*)gcry_md_read(m_context, 0));
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#else
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SHA1_Final(digest.begin(), &m_context);
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#endif
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return digest;
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}
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void reset()
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{
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#ifdef TORRENT_USE_GCRYPT
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gcry_md_reset(m_context);
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#else
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SHA1_Init(&m_context);
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#endif
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}
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#ifdef TORRENT_USE_GCRYPT
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~hasher()
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{
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gcry_md_close(m_context);
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}
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#endif
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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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#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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