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65 lines
2.6 KiB
C++
65 lines
2.6 KiB
C++
/*
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* Copyright (c) 2011, Peter Thorson. All rights reserved.
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*
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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 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 the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the WebSocket++ Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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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 PETER THORSON BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "hybi_util.hpp"
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namespace websocketpp {
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namespace processor {
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namespace hybi_util {
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size_t prepare_masking_key(const masking_key_type& key) {
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size_t prepared_key = key.i;
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size_t wordSize = sizeof(size_t);
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if (wordSize == 8) {
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prepared_key <<= 32;
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prepared_key |= (static_cast<size_t>(key.i) & 0x00000000FFFFFFFFLL);
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}
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return prepared_key;
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}
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size_t circshift_prepared_key(size_t prepared_key, size_t offset) {
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size_t temp = prepared_key << (sizeof(size_t)-offset)*8;
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return (prepared_key >> offset*8) | temp;
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}
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void word_mask_exact(char* data,size_t length,const masking_key_type& key) {
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size_t prepared_key = prepare_masking_key(key);
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size_t n = length/sizeof(size_t);
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size_t* word_data = reinterpret_cast<size_t*>(data);
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for (size_t i = 0; i < n; i++) {
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word_data[i] ^= prepared_key;
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}
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for (size_t i = n*sizeof(size_t); i < length; i++) {
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data[i] ^= key.c[i%4];
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}
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}
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} // namespace hybi_util
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} // namespace processor
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} // namespace websocketpp
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