mfbt/SHA1.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 /* Simple class for computing SHA1. */
   7
   8 /*
   9  * To compute the SHA1 of a buffer using this class you should write something
  10  * like:
  11  * void SHA1(const uint8_t* buf, unsigned size, uint8_t hash[20])
  12  * {
  13  *   SHA1Sum S;
  14  *   S.update(buf, size);
  15  *   S.finish(hash);
  16  * }
  17  * If there are multiple buffers or chunks, the update method can be called
  18  * multiple times and the SHA1 is computed on the concatenation of all the
  19  * buffers passed to it.
  20  * The finish method may only be called once and cannot be followed by calls
  21  * to update.
  22  */
  23
  24 #ifndef mozilla_SHA1_h_
  25 #define mozilla_SHA1_h_
  26
  27 #include "mozilla/StandardInteger.h"
  28 namespace mozilla {
  29 class SHA1Sum {
  30   union {
  31     uint32_t w[16];         /* input buffer */
  32     uint8_t  b[64];
  33   } u;
  34   uint64_t size;            /* count of hashed bytes. */
  35   unsigned H[22];           /* 5 state variables, 16 tmp values, 1 extra */
  36   bool mDone;
  37
  38 public:
  39   static const unsigned int HashSize = 20;
  40   SHA1Sum();
  41   void update(const uint8_t *dataIn, uint32_t len);
  42   void finish(uint8_t hashout[20]);
  43 };
  44 }
  45
  46 #endif /* mozilla_SHA1_h_ */