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      1 /*
      2  * Copyright (C) 2011 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef WTF_SHA1_h
     32 #define WTF_SHA1_h
     33 
     34 #include "wtf/Vector.h"
     35 #include "wtf/WTFExport.h"
     36 #include "wtf/text/CString.h"
     37 
     38 namespace WTF {
     39 
     40 class WTF_EXPORT SHA1 {
     41 public:
     42     SHA1();
     43 
     44     void addBytes(const Vector<uint8_t>& input)
     45     {
     46         addBytes(input.data(), input.size());
     47     }
     48     void addBytes(const CString& input)
     49     {
     50         const char* string = input.data();
     51         // Make sure that the creator of the CString didn't make the mistake
     52         // of forcing length() to be the size of the buffer used to create the
     53         // string, prior to inserting the null terminator earlier in the
     54         // sequence.
     55         ASSERT(input.length() == strlen(string));
     56         addBytes(reinterpret_cast<const uint8_t*>(string), input.length());
     57     }
     58     void addBytes(const uint8_t* input, size_t length);
     59 
     60     // computeHash has a side effect of resetting the state of the object.
     61     void computeHash(Vector<uint8_t, 20>&);
     62 
     63 private:
     64     void finalize();
     65     void processBlock();
     66     void reset();
     67 
     68     uint8_t m_buffer[64];
     69     size_t m_cursor; // Number of bytes filled in m_buffer (0-64).
     70     uint64_t m_totalBytes; // Number of bytes added so far.
     71     uint32_t m_hash[5];
     72 };
     73 
     74 } // namespace WTF
     75 
     76 using WTF::SHA1;
     77 
     78 #endif // WTF_SHA1_h
     79