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Diffstat (limited to 'stack/gatt/gatt_sr_hash.cc')
| -rw-r--r-- | stack/gatt/gatt_sr_hash.cc | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/stack/gatt/gatt_sr_hash.cc b/stack/gatt/gatt_sr_hash.cc new file mode 100644 index 000000000..c664d1435 --- /dev/null +++ b/stack/gatt/gatt_sr_hash.cc @@ -0,0 +1,128 @@ +/****************************************************************************** + * + * Copyright 2020 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 <base/strings/string_number_conversions.h> +#include <list> + +#include "gatt_int.h" +#include "stack/crypto_toolbox/crypto_toolbox.h" + +using bluetooth::Uuid; + +static size_t calculate_database_info_size(std::list<tGATT_SRV_LIST_ELEM>* lst_ptr) { + size_t len = 0; + auto srv_it = lst_ptr->begin(); + for (; srv_it != lst_ptr->end(); srv_it++) { + auto attr_list = &srv_it->p_db->attr_list; + auto attr_it = attr_list->begin(); + for (; attr_it != attr_list->end(); attr_it++) { + if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_PRI_SERVICE) || + attr_it->uuid == Uuid::From16Bit(GATT_UUID_SEC_SERVICE)) { + // Service declaration (Handle + Type + Value) + len += 4 + gatt_build_uuid_to_stream_len(attr_it->p_value->uuid); + } else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_INCLUDE_SERVICE)){ + // Included service declaration (Handle + Type + Value) + len += 8 + gatt_build_uuid_to_stream_len(attr_it->p_value->incl_handle.service_type); + } else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_DECLARE)) { + // Characteristic declaration (Handle + Type + Value) + len += 7 + gatt_build_uuid_to_stream_len((++attr_it)->uuid); + } else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_DESCRIPTION) || + attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_CLIENT_CONFIG) || + attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_SRVR_CONFIG) || + attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_PRESENT_FORMAT) || + attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_AGG_FORMAT)) { + // Descriptor (Handle + Type) + len += 4; + } else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_EXT_PROP)) { + // Descriptor for ext property (Handle + Type + Value) + len += 6; + } + } + } + return len; +} + +static void fill_database_info(std::list<tGATT_SRV_LIST_ELEM>* lst_ptr, uint8_t* p_data) { + auto srv_it = lst_ptr->begin(); + for (; srv_it != lst_ptr->end(); srv_it++) { + auto attr_list = &srv_it->p_db->attr_list; + auto attr_it = attr_list->begin(); + for (; attr_it != attr_list->end(); attr_it++) { + if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_PRI_SERVICE) || + attr_it->uuid == Uuid::From16Bit(GATT_UUID_SEC_SERVICE)) { + // Service declaration + UINT16_TO_STREAM(p_data, attr_it->handle); + + if (srv_it->is_primary) { + UINT16_TO_STREAM(p_data, GATT_UUID_PRI_SERVICE); + } else { + UINT16_TO_STREAM(p_data, GATT_UUID_SEC_SERVICE); + } + + gatt_build_uuid_to_stream(&p_data, attr_it->p_value->uuid); + } else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_INCLUDE_SERVICE)){ + // Included service declaration + UINT16_TO_STREAM(p_data, attr_it->handle); + UINT16_TO_STREAM(p_data, GATT_UUID_INCLUDE_SERVICE); + UINT16_TO_STREAM(p_data, attr_it->p_value->incl_handle.s_handle); + UINT16_TO_STREAM(p_data, attr_it->p_value->incl_handle.e_handle); + + gatt_build_uuid_to_stream(&p_data, attr_it->p_value->incl_handle.service_type); + } else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_DECLARE)) { + // Characteristic declaration + UINT16_TO_STREAM(p_data, attr_it->handle); + UINT16_TO_STREAM(p_data, GATT_UUID_CHAR_DECLARE); + UINT8_TO_STREAM(p_data, attr_it->p_value->char_decl.property); + UINT16_TO_STREAM(p_data, attr_it->p_value->char_decl.char_val_handle); + + // Increment 1 to fetch characteristic uuid from value declaration attribute + gatt_build_uuid_to_stream(&p_data, (++attr_it)->uuid); + } else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_DESCRIPTION) || + attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_CLIENT_CONFIG) || + attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_SRVR_CONFIG) || + attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_PRESENT_FORMAT) || + attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_AGG_FORMAT)) { + // Descriptor + UINT16_TO_STREAM(p_data, attr_it->handle); + UINT16_TO_STREAM(p_data, attr_it->uuid.As16Bit()); + } else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_EXT_PROP)) { + // Descriptor + UINT16_TO_STREAM(p_data, attr_it->handle); + UINT16_TO_STREAM(p_data, attr_it->uuid.As16Bit()); + UINT16_TO_STREAM(p_data, attr_it->p_value + ? attr_it->p_value->char_ext_prop + : 0x0000); + } + } + } +} + +Octet16 gatts_calculate_database_hash(std::list<tGATT_SRV_LIST_ELEM>* lst_ptr) { + int len = calculate_database_info_size(lst_ptr); + + std::vector<uint8_t> serialized(len); + fill_database_info(lst_ptr, serialized.data()); + + std::reverse(serialized.begin(), serialized.end()); + Octet16 db_hash = crypto_toolbox::aes_cmac(Octet16{0}, serialized.data(), + serialized.size()); + LOG(INFO) << __func__ << ": hash=" + << base::HexEncode(db_hash.data(), db_hash.size()); + + return db_hash; +} |