1 // 2 // Copyright (C) 2014 The Android Open Source Project 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 #ifndef TRUNKS_AUTHORIZATION_DELEGATE_H_ 18 #define TRUNKS_AUTHORIZATION_DELEGATE_H_ 19 20 #include <string> 21 22 #include <base/macros.h> 23 24 namespace trunks { 25 26 // AuthorizationDelegate is an interface passed to TPM commands. The delegate 27 // takes care of providing the authorization data for commands and verifying 28 // authorization data for responses. It also handles parameter encryption for 29 // commands and parameter decryption for responses. 30 class AuthorizationDelegate { 31 public: AuthorizationDelegate()32 AuthorizationDelegate() {} ~AuthorizationDelegate()33 virtual ~AuthorizationDelegate() {} 34 35 // Provides authorization data for a command which has a cpHash value of 36 // |command_hash|. The availability of encryption for the command is indicated 37 // by |is_*_parameter_encryption_possible|. On success, |authorization| is 38 // populated with the exact octets for the Authorization Area of the command. 39 // Returns true on success. 40 virtual bool GetCommandAuthorization( 41 const std::string& command_hash, 42 bool is_command_parameter_encryption_possible, 43 bool is_response_parameter_encryption_possible, 44 std::string* authorization) = 0; 45 46 // Checks authorization data for a response which has a rpHash value of 47 // |response_hash|. The exact octets from the Authorization Area of the 48 // response are given in |authorization|. Returns true iff the authorization 49 // is valid. 50 virtual bool CheckResponseAuthorization(const std::string& response_hash, 51 const std::string& authorization) = 0; 52 53 // Encrypts |parameter| if encryption is enabled. Returns true on success. 54 virtual bool EncryptCommandParameter(std::string* parameter) = 0; 55 56 // Decrypts |parameter| if encryption is enabled. Returns true on success. 57 virtual bool DecryptResponseParameter(std::string* parameter) = 0; 58 59 private: 60 DISALLOW_COPY_AND_ASSIGN(AuthorizationDelegate); 61 }; 62 63 } // namespace trunks 64 65 #endif // TRUNKS_AUTHORIZATION_DELEGATE_H_ 66