15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#include "components/variations/metrics_util.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/sha1.h" 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/sys_byteorder.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace metrics { 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)uint32 HashName(const std::string& name) { 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // SHA-1 is designed to produce a uniformly random spread in its output space, 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // even for nearly-identical inputs. 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned char sha1_hash[base::kSHA1Length]; 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::SHA1HashBytes(reinterpret_cast<const unsigned char*>(name.c_str()), 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) name.size(), 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) sha1_hash); 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32 bits; 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) COMPILE_ASSERT(sizeof(bits) < sizeof(sha1_hash), need_more_data); 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memcpy(&bits, sha1_hash, sizeof(bits)); 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return base::ByteSwapToLE32(bits); 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace metrics 28