mfbt/SHA1.h
author Georg Fritzsche <georg.fritzsche@googlemail.com>
Mon, 22 May 2017 15:33:29 +0700
changeset 410493 af4327fd49cd93c717328e61caf1af692a0e52a0
parent 215455 91d7659bb35145e10ff737753688e0972c1a79b5
child 508163 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1361661 - Part 1: Generate headers with process data from Processes.yaml. r=dexter Adding the Gecko enums to Processes.yaml allows us to generate mappings from ProcessID to GeckoProcessType. We generate string tables with the Telemetry process names, so we can use these names consistently throughout Telemetry.

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* Simple class for computing SHA1. */

#ifndef mozilla_SHA1_h
#define mozilla_SHA1_h

#include "mozilla/Types.h"

#include <stddef.h>
#include <stdint.h>

namespace mozilla {

/**
 * This class computes the SHA1 hash of a byte sequence, or of the concatenation
 * of multiple sequences.  For example, computing the SHA1 of two sequences of
 * bytes could be done as follows:
 *
 *   void SHA1(const uint8_t* buf1, uint32_t size1,
 *             const uint8_t* buf2, uint32_t size2,
 *             SHA1Sum::Hash& hash)
 *   {
 *     SHA1Sum s;
 *     s.update(buf1, size1);
 *     s.update(buf2, size2);
 *     s.finish(hash);
 *   }
 *
 * The finish method may only be called once and cannot be followed by calls
 * to update.
 */
class SHA1Sum
{
  union
  {
    uint32_t mW[16]; /* input buffer */
    uint8_t mB[64];
  } mU;
  uint64_t mSize; /* count of hashed bytes. */
  unsigned mH[22]; /* 5 state variables, 16 tmp values, 1 extra */
  bool mDone;

public:
  MFBT_API SHA1Sum();

  static const size_t kHashSize = 20;
  typedef uint8_t Hash[kHashSize];

  /* Add len bytes of dataIn to the data sequence being hashed. */
  MFBT_API void update(const void* aData, uint32_t aLength);

  /* Compute the final hash of all data into hashOut. */
  MFBT_API void finish(SHA1Sum::Hash& aHashOut);
};

} /* namespace mozilla */

#endif /* mozilla_SHA1_h */