• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 // Copyright 2016 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 "base/unguessable_token.h"
6 
7 #include "base/format_macros.h"
8 #include "base/rand_util.h"
9 #include "base/strings/stringprintf.h"
10 
11 namespace base {
12 
UnguessableToken(uint64_t high,uint64_t low)13 UnguessableToken::UnguessableToken(uint64_t high, uint64_t low)
14     : high_(high), low_(low) {}
15 
ToString() const16 std::string UnguessableToken::ToString() const {
17   return base::StringPrintf("(%08" PRIX64 "%08" PRIX64 ")", high_, low_);
18 }
19 
20 // static
Create()21 UnguessableToken UnguessableToken::Create() {
22   UnguessableToken token;
23   // Use base::RandBytes instead of crypto::RandBytes, because crypto calls the
24   // base version directly, and to prevent the dependency from base/ to crypto/.
25   base::RandBytes(&token, sizeof(token));
26   return token;
27 }
28 
29 // static
Deserialize(uint64_t high,uint64_t low)30 UnguessableToken UnguessableToken::Deserialize(uint64_t high, uint64_t low) {
31   // Receiving a zeroed out UnguessableToken from another process means that it
32   // was never initialized via Create(). Treat this case as a security issue.
33   DCHECK(!(high == 0 && low == 0));
34   return UnguessableToken(high, low);
35 }
36 
operator <<(std::ostream & out,const UnguessableToken & token)37 std::ostream& operator<<(std::ostream& out, const UnguessableToken& token) {
38   return out << token.ToString();
39 }
40 
41 }  // namespace base
42