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. 4 5 #ifndef BASE_GUID_H_ 6 #define BASE_GUID_H_ 7 8 #include <stdint.h> 9 10 #include <string> 11 12 #include "base/base_export.h" 13 #include "base/strings/string_piece.h" 14 #include "build/build_config.h" 15 16 namespace base { 17 18 // Generate a 128-bit (pseudo) random GUID in the form of version 4 as described 19 // in 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. 23 // If GUID generation fails an empty string is returned. 24 BASE_EXPORT std::string GenerateGUID(); 25 26 // Returns true if the input string conforms to the version 4 GUID format. 27 // Note that this does NOT check if the hexadecimal values "a" through "f" 28 // are in lower case characters, as Version 4 RFC says onput they're 29 // case insensitive. (Use IsValidGUIDOutputString for checking if the 30 // given string is valid output string) 31 BASE_EXPORT bool IsValidGUID(const base::StringPiece& guid); 32 33 // Returns true if the input string is valid version 4 GUID output string. 34 // This also checks if the hexadecimal values "a" through "f" are in lower 35 // case characters. 36 BASE_EXPORT bool IsValidGUIDOutputString(const base::StringPiece& guid); 37 38 // For unit testing purposes only. Do not use outside of tests. 39 BASE_EXPORT std::string RandomDataToGUIDString(const uint64_t bytes[2]); 40 41 } // namespace base 42 43 #endif // BASE_GUID_H_ 44