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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "components/variations/metrics_util.h" | 5 #include "components/variations/metrics_util.h" |
6 | 6 |
7 #include "base/sha1.h" | 7 #include "base/sha1.h" |
8 #include "base/sys_byteorder.h" | 8 #include "base/sys_byteorder.h" |
9 | 9 |
10 namespace metrics { | 10 namespace metrics { |
11 | 11 |
12 uint32 HashName(const std::string& name) { | 12 uint32_t HashName(const std::string& name) { |
13 // SHA-1 is designed to produce a uniformly random spread in its output space, | 13 // SHA-1 is designed to produce a uniformly random spread in its output space, |
14 // even for nearly-identical inputs. | 14 // even for nearly-identical inputs. |
15 unsigned char sha1_hash[base::kSHA1Length]; | 15 unsigned char sha1_hash[base::kSHA1Length]; |
16 base::SHA1HashBytes(reinterpret_cast<const unsigned char*>(name.c_str()), | 16 base::SHA1HashBytes(reinterpret_cast<const unsigned char*>(name.c_str()), |
17 name.size(), | 17 name.size(), |
18 sha1_hash); | 18 sha1_hash); |
19 | 19 |
20 uint32 bits; | 20 uint32_t bits; |
21 static_assert(sizeof(bits) < sizeof(sha1_hash), "more data required"); | 21 static_assert(sizeof(bits) < sizeof(sha1_hash), "more data required"); |
22 memcpy(&bits, sha1_hash, sizeof(bits)); | 22 memcpy(&bits, sha1_hash, sizeof(bits)); |
23 | 23 |
24 return base::ByteSwapToLE32(bits); | 24 return base::ByteSwapToLE32(bits); |
25 } | 25 } |
26 | 26 |
27 } // namespace metrics | 27 } // namespace metrics |
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