components/proximity_auth/cryptauth/cryptauth_enrollment_utils.cc

   1 // Copyright 2015 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/proximity_auth/cryptauth/cryptauth_enrollment_utils.h"
   6
   7 #include <math.h>
   8
   9 #include "base/md5.h"
  10 #include "base/sha1.h"
  11 #include "components/proximity_auth/cryptauth/base64url.h"
  12
  13 namespace proximity_auth {
  14
  15 int64_t HashStringToInt64(const std::string& string) {
  16   base::MD5Context context;
  17   base::MD5Init(&context);
  18   base::MD5Update(&context, string);
  19
  20   base::MD5Digest digest;
  21   base::MD5Final(&digest, &context);
  22
  23   // Fold the digest into an int64 value. |digest.a| is a 16-byte array, so we
  24   // sum the two 8-byte halves of the digest to create the hash.
  25   int64_t hash = 0;
  26   for (size_t i = 0; i < sizeof(digest.a); ++i) {
  27     uint8_t byte = digest.a[i];
  28     hash += static_cast<int64_t>(byte) << (i % sizeof(int64_t));
  29   }
  30
  31   return hash;
  32 }
  33
  34 std::string CalculateDeviceUserId(const std::string& device_id,
  35                                   const std::string& user_id) {
  36   std::string device_user_id;
  37   Base64UrlEncode(base::SHA1HashString(device_id + "|" + user_id),
  38                   &device_user_id);
  39   return device_user_id;
  40 }
  41
  42 }  // namespace proximity_auth