blob: 0644ce33f5c43ea2c8342beec64b2632f541f5da [file] [log] [blame]
// Copyright 2014 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "metrics/uploader/metrics_hashes.h"
#include <base/hash/md5.h>
#include <base/logging.h>
#include <base/stl_util.h>
#include <base/sys_byteorder.h>
namespace metrics {
namespace {
// Converts the 8-byte prefix of an MD5 hash into a uint64_t value.
inline uint64_t HashToUInt64(const std::string& hash) {
uint64_t value;
DCHECK_GE(hash.size(), sizeof(value));
memcpy(&value,, sizeof(value));
return base::HostToNet64(value);
} // namespace
uint64_t HashMetricName(const std::string& name) {
// Create an MD5 hash of the given |name|, represented as a byte buffer
// encoded as an std::string.
base::MD5Context context;
base::MD5Update(&context, name);
base::MD5Digest digest;
base::MD5Final(&digest, &context);
std::string hash_str(reinterpret_cast<char*>(digest.a), base::size(digest.a));
return HashToUInt64(hash_str);
} // namespace metrics