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.
12 #include "base/base_export.h"
13 #include "base/strings/string_piece.h"
14 #include "build/build_config.h"
18 // Generate a 128-bit random GUID in the form of version 4 as described in
19 // RFC 4122, section 4.4.
20 // The format of GUID version 4 must be xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx,
21 // where y is one of [8, 9, A, B].
22 // The hexadecimal values "a" through "f" are output as lower case characters.
24 // A cryptographically secure random source will be used, but consider using
25 // UnguessableToken for greater type-safety if GUID format is unnecessary.
26 BASE_EXPORT std::string GenerateGUID();
28 // Returns true if the input string conforms to the version 4 GUID format.
29 // Note that this does NOT check if the hexadecimal values "a" through "f"
30 // are in lower case characters, as Version 4 RFC says onput they're
31 // case insensitive. (Use IsValidGUIDOutputString for checking if the
32 // given string is valid output string)
33 BASE_EXPORT bool IsValidGUID(const base::StringPiece& guid);
35 // Returns true if the input string is valid version 4 GUID output string.
36 // This also checks if the hexadecimal values "a" through "f" are in lower
38 BASE_EXPORT bool IsValidGUIDOutputString(const base::StringPiece& guid);
40 // For unit testing purposes only. Do not use outside of tests.
41 BASE_EXPORT std::string RandomDataToGUIDString(const uint64_t bytes[2]);
45 #endif // BASE_GUID_H_