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 COMPILE_ASSERT(sizeof(bits) < sizeof(sha1_hash), need_more_data); 22 memcpy(&bits, sha1_hash, sizeof(bits)); 23 24 return base::ByteSwapToLE32(bits); 25 } 26 27 } // namespace metrics 28
