| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "operation_table.h" |
| |
| #include <new> |
| |
| #include <openssl/rand.h> |
| |
| #include "openssl_err.h" |
| #include "operation.h" |
| |
| namespace keymaster { |
| |
| OperationTable::Entry::~Entry() { |
| delete operation; |
| operation = NULL; |
| handle = 0; |
| } |
| |
| keymaster_error_t OperationTable::Add(Operation* operation, |
| keymaster_operation_handle_t* op_handle) { |
| if (!table_.get()) { |
| table_.reset(new (std::nothrow) Entry[table_size_]); |
| if (!table_.get()) |
| return KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| } |
| |
| UniquePtr<Operation> op(operation); |
| if (RAND_bytes(reinterpret_cast<uint8_t*>(op_handle), sizeof(*op_handle)) != 1) |
| return TranslateLastOpenSslError(); |
| if (*op_handle == 0) { |
| // Statistically this is vanishingly unlikely, which means if it ever happens in practice, |
| // it indicates a broken RNG. |
| return KM_ERROR_UNKNOWN_ERROR; |
| } |
| |
| for (size_t i = 0; i < table_size_; ++i) { |
| if (table_[i].operation == NULL) { |
| table_[i].operation = op.release(); |
| table_[i].handle = *op_handle; |
| return KM_ERROR_OK; |
| } |
| } |
| return KM_ERROR_TOO_MANY_OPERATIONS; |
| } |
| |
| Operation* OperationTable::Find(keymaster_operation_handle_t op_handle) { |
| if (op_handle == 0) |
| return NULL; |
| |
| if (!table_.get()) |
| return NULL; |
| |
| for (size_t i = 0; i < table_size_; ++i) { |
| if (table_[i].handle == op_handle) |
| return table_[i].operation; |
| } |
| return NULL; |
| } |
| |
| bool OperationTable::Delete(keymaster_operation_handle_t op_handle) { |
| if (!table_.get()) |
| return false; |
| |
| for (size_t i = 0; i < table_size_; ++i) { |
| if (table_[i].handle == op_handle) { |
| delete table_[i].operation; |
| table_[i].operation = NULL; |
| table_[i].handle = 0; |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| } // namespace keymaster |