components/variations/metrics_util.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/variations/metrics_util.h"
   6
   7 #include "base/sha1.h"
   8 #include "base/sys_byteorder.h"
   9
  10 namespace metrics {
  11
  12 uint32 HashName(const std::string& name) {
  13   // SHA-1 is designed to produce a uniformly random spread in its output space,
  14   // even for nearly-identical inputs.
  15   unsigned char sha1_hash[base::kSHA1Length];
  16   base::SHA1HashBytes(reinterpret_cast<const unsigned char*>(name.c_str()),
  17                       name.size(),
  18                       sha1_hash);
  19
  20   uint32 bits;
  21   static_assert(sizeof(bits) < sizeof(sha1_hash), "more data required");
  22   memcpy(&bits, sha1_hash, sizeof(bits));
  23
  24   return base::ByteSwapToLE32(bits);
  25 }
  26
  27 }  // namespace metrics