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 /*

  * Copyright 2013 Google Inc.

  *

  * Use of this source code is governed by a BSD-style license that can be

  * found in the LICENSE file.

  */

 #ifndef SkSHA1_DEFINED

 #define SkSHA1_DEFINED

 #include "SkTypes.h"

 #include "SkEndian.h"

 #include "SkStream.h"

 //The following macros can be defined to affect the SHA1 code generated.

 //SK_SHA1_CLEAR_DATA causes all intermediate state to be overwritten with 0's.

 //SK_CPU_BENDIAN allows 32 bit <=> 8 bit conversions without copies (if alligned).

 //SK_CPU_FAST_UNALIGNED_ACCESS allows 32 bit <=> 8 bit conversions without copies if SK_CPU_BENDIAN.

 class SkSHA1 : public SkWStream {

 public:

     SkSHA1();

     /** Processes input, adding it to the digest.

      *  Note that this treats the buffer as a series of uint8_t values.

      */

     virtual bool write(const void* buffer, size_t size) SK_OVERRIDE {

         update(reinterpret_cast<const uint8_t*>(buffer), size);

         return true;

     }

     virtual size_t bytesWritten() const SK_OVERRIDE { return SkToSizeT(this->byteCount); }

     /** Processes input, adding it to the digest. Calling this after finish is undefined. */

     void update(const uint8_t* input, size_t length);

     struct Digest {

         uint8_t data[20];

     };

     /** Computes and returns the digest. */

     void finish(Digest& digest);

 private:

     // number of bytes, modulo 2^64

     uint64_t byteCount;

     // state (ABCDE)

     uint32_t state[5];

     // input buffer

     uint8_t buffer[64];

 };

 #endif