compute/detail/sha1.hpp

0001 //---------------------------------------------------------------------------//
0002 // Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@gmail.com>
0003 //
0004 // Distributed under the Boost Software License, Version 1.0
0005 // See accompanying file LICENSE_1_0.txt or copy at
0006 // http://www.boost.org/LICENSE_1_0.txt
0007 //
0008 // See http://boostorg.github.com/compute for more information.
0009 //---------------------------------------------------------------------------//
0010
0011 #ifndef BOOST_COMPUTE_DETAIL_SHA1_HPP
0012 #define BOOST_COMPUTE_DETAIL_SHA1_HPP
0013
0014 #include <sstream>
0015 #include <iomanip>
0016 #include <boost/version.hpp>
0017 #if BOOST_VERSION >= 106600
0018 #  include <boost/uuid/detail/sha1.hpp>
0019 #else
0020 #  include <boost/uuid/sha1.hpp>
0021 #endif
0022
0023 namespace boost {
0024 namespace compute {
0025 namespace detail {
0026
0027 // Accumulates SHA1 hash of the passed strings.
0028 class sha1 {
0029     public:
0030         sha1(const std::string &s = "") {
0031             if (!s.empty()) this->process(s);
0032         }
0033
0034         sha1& process(const std::string &s) {
0035             h.process_bytes(s.c_str(), s.size());
0036             return *this;
0037         }
0038
0039         operator std::string() {
0040             #if BOOST_VERSION >= 108600
0041             boost::uuids::detail::sha1::digest_type digest;
0042             #else
0043             unsigned int digest[5];
0044             #endif
0045
0046             h.get_digest(digest);
0047
0048             std::ostringstream buf;
0049             #if BOOST_VERSION >= 108600
0050             for(int i = 0; i < 20; ++i)
0051                 buf << std::hex << std::setfill('0') << std::setw(2) << +digest[i];
0052             #else
0053             for(int i = 0; i < 5; ++i)
0054                 buf << std::hex << std::setfill('0') << std::setw(8) << digest[i];
0055             #endif
0056             return buf.str();
0057         }
0058     private:
0059         boost::uuids::detail::sha1 h;
0060 };
0061
0062 } // end detail namespace
0063 } // end compute namespace
0064 } // end boost namespace
0065
0066
0067 #endif // BOOST_COMPUTE_DETAIL_SHA1_HPP