src/platform/Ameba/FactoryDataProvider.cpp

/*
 *
 *    Copyright (c) 2022 Project CHIP Authors
 *
 *    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 "FactoryDataProvider.h"

#include "FactoryDataDecoder.h"
#include <crypto/CHIPCryptoPAL.h>
#include <lib/core/CHIPError.h>
#include <lib/support/Base64.h>
#include <lib/support/BytesToHex.h>
#include <lib/support/Span.h>
#include <platform/Ameba/CHIPDevicePlatformConfig.h>
#include <platform/CHIPDeviceConfig.h>
#include <platform/CHIPDeviceLayer.h>
#include <platform/ConnectivityManager.h>
#include <platform/internal/CHIPDeviceLayerInternal.h>
#include <platform/internal/GenericConfigurationManagerImpl.ipp>

using namespace ::chip::DeviceLayer::Internal;

namespace chip {
namespace DeviceLayer {

const uint8_t kCdForAllExamples[] = {
    0x30, 0x82, 0x02, 0x19, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x07, 0x02, 0xa0, 0x82, 0x02, 0x0a, 0x30, 0x82,
    0x02, 0x06, 0x02, 0x01, 0x03, 0x31, 0x0d, 0x30, 0x0b, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x30,
    0x82, 0x01, 0x71, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x07, 0x01, 0xa0, 0x82, 0x01, 0x62, 0x04, 0x82, 0x01,
    0x5e, 0x15, 0x24, 0x00, 0x01, 0x25, 0x01, 0xf1, 0xff, 0x36, 0x02, 0x05, 0x00, 0x80, 0x05, 0x01, 0x80, 0x05, 0x02, 0x80, 0x05,
    0x03, 0x80, 0x05, 0x04, 0x80, 0x05, 0x05, 0x80, 0x05, 0x06, 0x80, 0x05, 0x07, 0x80, 0x05, 0x08, 0x80, 0x05, 0x09, 0x80, 0x05,
    0x0a, 0x80, 0x05, 0x0b, 0x80, 0x05, 0x0c, 0x80, 0x05, 0x0d, 0x80, 0x05, 0x0e, 0x80, 0x05, 0x0f, 0x80, 0x05, 0x10, 0x80, 0x05,
    0x11, 0x80, 0x05, 0x12, 0x80, 0x05, 0x13, 0x80, 0x05, 0x14, 0x80, 0x05, 0x15, 0x80, 0x05, 0x16, 0x80, 0x05, 0x17, 0x80, 0x05,
    0x18, 0x80, 0x05, 0x19, 0x80, 0x05, 0x1a, 0x80, 0x05, 0x1b, 0x80, 0x05, 0x1c, 0x80, 0x05, 0x1d, 0x80, 0x05, 0x1e, 0x80, 0x05,
    0x1f, 0x80, 0x05, 0x20, 0x80, 0x05, 0x21, 0x80, 0x05, 0x22, 0x80, 0x05, 0x23, 0x80, 0x05, 0x24, 0x80, 0x05, 0x25, 0x80, 0x05,
    0x26, 0x80, 0x05, 0x27, 0x80, 0x05, 0x28, 0x80, 0x05, 0x29, 0x80, 0x05, 0x2a, 0x80, 0x05, 0x2b, 0x80, 0x05, 0x2c, 0x80, 0x05,
    0x2d, 0x80, 0x05, 0x2e, 0x80, 0x05, 0x2f, 0x80, 0x05, 0x30, 0x80, 0x05, 0x31, 0x80, 0x05, 0x32, 0x80, 0x05, 0x33, 0x80, 0x05,
    0x34, 0x80, 0x05, 0x35, 0x80, 0x05, 0x36, 0x80, 0x05, 0x37, 0x80, 0x05, 0x38, 0x80, 0x05, 0x39, 0x80, 0x05, 0x3a, 0x80, 0x05,
    0x3b, 0x80, 0x05, 0x3c, 0x80, 0x05, 0x3d, 0x80, 0x05, 0x3e, 0x80, 0x05, 0x3f, 0x80, 0x05, 0x40, 0x80, 0x05, 0x41, 0x80, 0x05,
    0x42, 0x80, 0x05, 0x43, 0x80, 0x05, 0x44, 0x80, 0x05, 0x45, 0x80, 0x05, 0x46, 0x80, 0x05, 0x47, 0x80, 0x05, 0x48, 0x80, 0x05,
    0x49, 0x80, 0x05, 0x4a, 0x80, 0x05, 0x4b, 0x80, 0x05, 0x4c, 0x80, 0x05, 0x4d, 0x80, 0x05, 0x4e, 0x80, 0x05, 0x4f, 0x80, 0x05,
    0x50, 0x80, 0x05, 0x51, 0x80, 0x05, 0x52, 0x80, 0x05, 0x53, 0x80, 0x05, 0x54, 0x80, 0x05, 0x55, 0x80, 0x05, 0x56, 0x80, 0x05,
    0x57, 0x80, 0x05, 0x58, 0x80, 0x05, 0x59, 0x80, 0x05, 0x5a, 0x80, 0x05, 0x5b, 0x80, 0x05, 0x5c, 0x80, 0x05, 0x5d, 0x80, 0x05,
    0x5e, 0x80, 0x05, 0x5f, 0x80, 0x05, 0x60, 0x80, 0x05, 0x61, 0x80, 0x05, 0x62, 0x80, 0x05, 0x63, 0x80, 0x18, 0x24, 0x03, 0x16,
    0x2c, 0x04, 0x13, 0x5a, 0x49, 0x47, 0x32, 0x30, 0x31, 0x34, 0x32, 0x5a, 0x42, 0x33, 0x33, 0x30, 0x30, 0x30, 0x33, 0x2d, 0x32,
    0x34, 0x24, 0x05, 0x00, 0x24, 0x06, 0x00, 0x25, 0x07, 0x94, 0x26, 0x24, 0x08, 0x00, 0x18, 0x31, 0x7d, 0x30, 0x7b, 0x02, 0x01,
    0x03, 0x80, 0x14, 0x62, 0xfa, 0x82, 0x33, 0x59, 0xac, 0xfa, 0xa9, 0x96, 0x3e, 0x1c, 0xfa, 0x14, 0x0a, 0xdd, 0xf5, 0x04, 0xf3,
    0x71, 0x60, 0x30, 0x0b, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x30, 0x0a, 0x06, 0x08, 0x2a, 0x86,
    0x48, 0xce, 0x3d, 0x04, 0x03, 0x02, 0x04, 0x47, 0x30, 0x45, 0x02, 0x20, 0x24, 0xe5, 0xd1, 0xf4, 0x7a, 0x7d, 0x7b, 0x0d, 0x20,
    0x6a, 0x26, 0xef, 0x69, 0x9b, 0x7c, 0x97, 0x57, 0xb7, 0x2d, 0x46, 0x90, 0x89, 0xde, 0x31, 0x92, 0xe6, 0x78, 0xc7, 0x45, 0xe7,
    0xf6, 0x0c, 0x02, 0x21, 0x00, 0xf8, 0xaa, 0x2f, 0xa7, 0x11, 0xfc, 0xb7, 0x9b, 0x97, 0xe3, 0x97, 0xce, 0xda, 0x66, 0x7b, 0xae,
    0x46, 0x4e, 0x2b, 0xd3, 0xff, 0xdf, 0xc3, 0xcc, 0xed, 0x7a, 0xa8, 0xca, 0x5f, 0x4c, 0x1a, 0x7c,
};

const uint8_t kDacCert[] = {
    0x30, 0x82, 0x01, 0xe7, 0x30, 0x82, 0x01, 0x8e, 0xa0, 0x03, 0x02, 0x01, 0x02, 0x02, 0x08, 0x69, 0xcd, 0xf1, 0x0d, 0xe9, 0xe5,
    0x4e, 0xd1, 0x30, 0x0a, 0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x04, 0x03, 0x02, 0x30, 0x3d, 0x31, 0x25, 0x30, 0x23, 0x06,
    0x03, 0x55, 0x04, 0x03, 0x0c, 0x1c, 0x4d, 0x61, 0x74, 0x74, 0x65, 0x72, 0x20, 0x44, 0x65, 0x76, 0x20, 0x50, 0x41, 0x49, 0x20,
    0x30, 0x78, 0x46, 0x46, 0x46, 0x31, 0x20, 0x6e, 0x6f, 0x20, 0x50, 0x49, 0x44, 0x31, 0x14, 0x30, 0x12, 0x06, 0x0a, 0x2b, 0x06,
    0x01, 0x04, 0x01, 0x82, 0xa2, 0x7c, 0x02, 0x01, 0x0c, 0x04, 0x46, 0x46, 0x46, 0x31, 0x30, 0x20, 0x17, 0x0d, 0x32, 0x32, 0x30,
    0x32, 0x30, 0x35, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x5a, 0x18, 0x0f, 0x39, 0x39, 0x39, 0x39, 0x31, 0x32, 0x33, 0x31, 0x32,
    0x33, 0x35, 0x39, 0x35, 0x39, 0x5a, 0x30, 0x53, 0x31, 0x25, 0x30, 0x23, 0x06, 0x03, 0x55, 0x04, 0x03, 0x0c, 0x1c, 0x4d, 0x61,
    0x74, 0x74, 0x65, 0x72, 0x20, 0x44, 0x65, 0x76, 0x20, 0x44, 0x41, 0x43, 0x20, 0x30, 0x78, 0x46, 0x46, 0x46, 0x31, 0x2f, 0x30,
    0x78, 0x38, 0x30, 0x30, 0x31, 0x31, 0x14, 0x30, 0x12, 0x06, 0x0a, 0x2b, 0x06, 0x01, 0x04, 0x01, 0x82, 0xa2, 0x7c, 0x02, 0x01,
    0x0c, 0x04, 0x46, 0x46, 0x46, 0x31, 0x31, 0x14, 0x30, 0x12, 0x06, 0x0a, 0x2b, 0x06, 0x01, 0x04, 0x01, 0x82, 0xa2, 0x7c, 0x02,
    0x02, 0x0c, 0x04, 0x38, 0x30, 0x30, 0x31, 0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02, 0x01, 0x06,
    0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03, 0x42, 0x00, 0x04, 0x46, 0x3a, 0xc6, 0x93, 0x42, 0x91, 0x0a, 0x0e,
    0x55, 0x88, 0xfc, 0x6f, 0xf5, 0x6b, 0xb6, 0x3e, 0x62, 0xec, 0xce, 0xcb, 0x14, 0x8f, 0x7d, 0x4e, 0xb0, 0x3e, 0xe5, 0x52, 0x60,
    0x14, 0x15, 0x76, 0x7d, 0x16, 0xa5, 0xc6, 0x63, 0xf7, 0x93, 0xe4, 0x91, 0x23, 0x26, 0x0b, 0x82, 0x97, 0xa7, 0xcd, 0x7e, 0x7c,
    0xfc, 0x7b, 0x31, 0x6b, 0x39, 0xd9, 0x8e, 0x90, 0xd2, 0x93, 0x77, 0x73, 0x8e, 0x82, 0xa3, 0x60, 0x30, 0x5e, 0x30, 0x0c, 0x06,
    0x03, 0x55, 0x1d, 0x13, 0x01, 0x01, 0xff, 0x04, 0x02, 0x30, 0x00, 0x30, 0x0e, 0x06, 0x03, 0x55, 0x1d, 0x0f, 0x01, 0x01, 0xff,
    0x04, 0x04, 0x03, 0x02, 0x07, 0x80, 0x30, 0x1d, 0x06, 0x03, 0x55, 0x1d, 0x0e, 0x04, 0x16, 0x04, 0x14, 0x88, 0xdd, 0xe7, 0xb3,
    0x00, 0x38, 0x29, 0x32, 0xcf, 0xf7, 0x34, 0xc0, 0x46, 0x24, 0x81, 0x0f, 0x44, 0x16, 0x8a, 0x6f, 0x30, 0x1f, 0x06, 0x03, 0x55,
    0x1d, 0x23, 0x04, 0x18, 0x30, 0x16, 0x80, 0x14, 0x63, 0x54, 0x0e, 0x47, 0xf6, 0x4b, 0x1c, 0x38, 0xd1, 0x38, 0x84, 0xa4, 0x62,
    0xd1, 0x6c, 0x19, 0x5d, 0x8f, 0xfb, 0x3c, 0x30, 0x0a, 0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x04, 0x03, 0x02, 0x03, 0x47,
    0x00, 0x30, 0x44, 0x02, 0x20, 0x01, 0x27, 0xa2, 0x7b, 0x4b, 0x44, 0x61, 0x0e, 0xe2, 0xfc, 0xdc, 0x4d, 0x2b, 0x78, 0x85, 0x56,
    0x36, 0x60, 0xbc, 0x0f, 0x76, 0xf1, 0x72, 0x19, 0xed, 0x6a, 0x08, 0xdf, 0xb2, 0xb3, 0xc1, 0xcd, 0x02, 0x20, 0x6b, 0x59, 0xe0,
    0xaf, 0x45, 0xf3, 0xeb, 0x2a, 0x85, 0xb9, 0x19, 0xd3, 0x57, 0x31, 0x52, 0x8c, 0x60, 0x28, 0xc4, 0x15, 0x23, 0x95, 0x45, 0xe1,
    0x08, 0xe4, 0xe5, 0x4e, 0x70, 0x97, 0x13, 0x53,
};

const uint8_t kPaiCert[] = {
    0x30, 0x82, 0x01, 0xcb, 0x30, 0x82, 0x01, 0x71, 0xa0, 0x03, 0x02, 0x01, 0x02, 0x02, 0x08, 0x56, 0xad, 0x82, 0x22, 0xad, 0x94,
    0x5b, 0x64, 0x30, 0x0a, 0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x04, 0x03, 0x02, 0x30, 0x30, 0x31, 0x18, 0x30, 0x16, 0x06,
    0x03, 0x55, 0x04, 0x03, 0x0c, 0x0f, 0x4d, 0x61, 0x74, 0x74, 0x65, 0x72, 0x20, 0x54, 0x65, 0x73, 0x74, 0x20, 0x50, 0x41, 0x41,
    0x31, 0x14, 0x30, 0x12, 0x06, 0x0a, 0x2b, 0x06, 0x01, 0x04, 0x01, 0x82, 0xa2, 0x7c, 0x02, 0x01, 0x0c, 0x04, 0x46, 0x46, 0x46,
    0x31, 0x30, 0x20, 0x17, 0x0d, 0x32, 0x32, 0x30, 0x32, 0x30, 0x35, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x5a, 0x18, 0x0f, 0x39,
    0x39, 0x39, 0x39, 0x31, 0x32, 0x33, 0x31, 0x32, 0x33, 0x35, 0x39, 0x35, 0x39, 0x5a, 0x30, 0x3d, 0x31, 0x25, 0x30, 0x23, 0x06,
    0x03, 0x55, 0x04, 0x03, 0x0c, 0x1c, 0x4d, 0x61, 0x74, 0x74, 0x65, 0x72, 0x20, 0x44, 0x65, 0x76, 0x20, 0x50, 0x41, 0x49, 0x20,
    0x30, 0x78, 0x46, 0x46, 0x46, 0x31, 0x20, 0x6e, 0x6f, 0x20, 0x50, 0x49, 0x44, 0x31, 0x14, 0x30, 0x12, 0x06, 0x0a, 0x2b, 0x06,
    0x01, 0x04, 0x01, 0x82, 0xa2, 0x7c, 0x02, 0x01, 0x0c, 0x04, 0x46, 0x46, 0x46, 0x31, 0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2a,
    0x86, 0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03, 0x42, 0x00, 0x04, 0x41,
    0x9a, 0x93, 0x15, 0xc2, 0x17, 0x3e, 0x0c, 0x8c, 0x87, 0x6d, 0x03, 0xcc, 0xfc, 0x94, 0x48, 0x52, 0x64, 0x7f, 0x7f, 0xec, 0x5e,
    0x50, 0x82, 0xf4, 0x05, 0x99, 0x28, 0xec, 0xa8, 0x94, 0xc5, 0x94, 0x15, 0x13, 0x09, 0xac, 0x63, 0x1e, 0x4c, 0xb0, 0x33, 0x92,
    0xaf, 0x68, 0x4b, 0x0b, 0xaf, 0xb7, 0xe6, 0x5b, 0x3b, 0x81, 0x62, 0xc2, 0xf5, 0x2b, 0xf9, 0x31, 0xb8, 0xe7, 0x7a, 0xaa, 0x82,
    0xa3, 0x66, 0x30, 0x64, 0x30, 0x12, 0x06, 0x03, 0x55, 0x1d, 0x13, 0x01, 0x01, 0xff, 0x04, 0x08, 0x30, 0x06, 0x01, 0x01, 0xff,
    0x02, 0x01, 0x00, 0x30, 0x0e, 0x06, 0x03, 0x55, 0x1d, 0x0f, 0x01, 0x01, 0xff, 0x04, 0x04, 0x03, 0x02, 0x01, 0x06, 0x30, 0x1d,
    0x06, 0x03, 0x55, 0x1d, 0x0e, 0x04, 0x16, 0x04, 0x14, 0x63, 0x54, 0x0e, 0x47, 0xf6, 0x4b, 0x1c, 0x38, 0xd1, 0x38, 0x84, 0xa4,
    0x62, 0xd1, 0x6c, 0x19, 0x5d, 0x8f, 0xfb, 0x3c, 0x30, 0x1f, 0x06, 0x03, 0x55, 0x1d, 0x23, 0x04, 0x18, 0x30, 0x16, 0x80, 0x14,
    0x6a, 0xfd, 0x22, 0x77, 0x1f, 0x51, 0x1f, 0xec, 0xbf, 0x16, 0x41, 0x97, 0x67, 0x10, 0xdc, 0xdc, 0x31, 0xa1, 0x71, 0x7e, 0x30,
    0x0a, 0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x04, 0x03, 0x02, 0x03, 0x48, 0x00, 0x30, 0x45, 0x02, 0x21, 0x00, 0xb2, 0xef,
    0x27, 0xf4, 0x9a, 0xe9, 0xb5, 0x0f, 0xb9, 0x1e, 0xea, 0xc9, 0x4c, 0x4d, 0x0b, 0xdb, 0xb8, 0xd7, 0x92, 0x9c, 0x6c, 0xb8, 0x8f,
    0xac, 0xe5, 0x29, 0x36, 0x8d, 0x12, 0x05, 0x4c, 0x0c, 0x02, 0x20, 0x65, 0x5d, 0xc9, 0x2b, 0x86, 0xbd, 0x90, 0x98, 0x82, 0xa6,
    0xc6, 0x21, 0x77, 0xb8, 0x25, 0xd7, 0xd0, 0x5e, 0xdb, 0xe7, 0xc2, 0x2f, 0x9f, 0xea, 0x71, 0x22, 0x0e, 0x7e, 0xa7, 0x03, 0xf8,
    0x91,
};

const uint8_t kDacPublicKey[] = {
    0x04, 0x46, 0x3a, 0xc6, 0x93, 0x42, 0x91, 0x0a, 0x0e, 0x55, 0x88, 0xfc, 0x6f, 0xf5, 0x6b, 0xb6, 0x3e,
    0x62, 0xec, 0xce, 0xcb, 0x14, 0x8f, 0x7d, 0x4e, 0xb0, 0x3e, 0xe5, 0x52, 0x60, 0x14, 0x15, 0x76, 0x7d,
    0x16, 0xa5, 0xc6, 0x63, 0xf7, 0x93, 0xe4, 0x91, 0x23, 0x26, 0x0b, 0x82, 0x97, 0xa7, 0xcd, 0x7e, 0x7c,
    0xfc, 0x7b, 0x31, 0x6b, 0x39, 0xd9, 0x8e, 0x90, 0xd2, 0x93, 0x77, 0x73, 0x8e, 0x82,
};

const uint8_t kDacPrivateKey[] = {
    0xaa, 0xb6, 0x00, 0xae, 0x8a, 0xe8, 0xaa, 0xb7, 0xd7, 0x36, 0x27, 0xc2, 0x17, 0xb7, 0xc2, 0x04,
    0x70, 0x9c, 0xa6, 0x94, 0x6a, 0xf5, 0xf2, 0xf7, 0x53, 0x08, 0x33, 0xa5, 0x2b, 0x44, 0xfb, 0xff,
};

// TODO: This should be moved to a method of P256Keypair
CHIP_ERROR LoadKeypairFromRaw(ByteSpan private_key, ByteSpan public_key, Crypto::P256Keypair & keypair)
{
    Crypto::P256SerializedKeypair serialized_keypair;
    ReturnErrorOnFailure(serialized_keypair.SetLength(private_key.size() + public_key.size()));
    memcpy(serialized_keypair.Bytes(), public_key.data(), public_key.size());
    memcpy(serialized_keypair.Bytes() + public_key.size(), private_key.data(), private_key.size());
    return keypair.Deserialize(serialized_keypair);
}

CHIP_ERROR FactoryDataProvider::Init()
{
    CHIP_ERROR err = CHIP_NO_ERROR;

#if CONFIG_ENABLE_AMEBA_FACTORY_DATA
    uint8_t buffer[2048]; // FactoryData won't overflow 2KB
    uint16_t factorydata_len;

    FactoryDataDecoder decoder = FactoryDataDecoder::GetInstance();
    err                        = decoder.ReadFactoryData(buffer, &factorydata_len);
    if (err != CHIP_NO_ERROR)
    {
        ChipLogError(DeviceLayer, "ReadFactoryData failed!");
        return err;
    }
    err = decoder.DecodeFactoryData(buffer, &mFactoryData, factorydata_len);
    if (err != CHIP_NO_ERROR)
    {
        ChipLogError(DeviceLayer, "DecodeFactoryData failed!");
        return err;
    }

    ChipLogProgress(DeviceLayer, "FactoryData of length: %d retrieved successfully", factorydata_len);
    kReadFromFlash = true;
#endif // CONFIG_ENABLE_AMEBA_FACTORY_DATA

    return err;
}

CHIP_ERROR FactoryDataProvider::GetCertificationDeclaration(MutableByteSpan & outBuffer)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    if (kReadFromFlash)
    {
        ReturnErrorCodeIf(outBuffer.size() < mFactoryData.dac.cd.len, CHIP_ERROR_BUFFER_TOO_SMALL);
        ReturnErrorCodeIf(!mFactoryData.dac.cd.value, CHIP_ERROR_PERSISTED_STORAGE_VALUE_NOT_FOUND);

        memcpy(outBuffer.data(), mFactoryData.dac.cd.value, mFactoryData.dac.cd.len);

        outBuffer.reduce_size(mFactoryData.dac.cd.len);
        err = CHIP_NO_ERROR;
    }
    else
    {
        err = CopySpanToMutableSpan(ByteSpan(kCdForAllExamples), outBuffer);
    }

    return err;
}

CHIP_ERROR FactoryDataProvider::GetFirmwareInformation(MutableByteSpan & out_firmware_info_buffer)
{
    // TODO: We need a real example FirmwareInformation to be populated.
    out_firmware_info_buffer.reduce_size(0);

    return CHIP_NO_ERROR;
}

CHIP_ERROR FactoryDataProvider::GetDeviceAttestationCert(MutableByteSpan & outBuffer)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    if (kReadFromFlash)
    {
        ReturnErrorCodeIf(outBuffer.size() < mFactoryData.dac.dac_cert.len, CHIP_ERROR_BUFFER_TOO_SMALL);
        ReturnErrorCodeIf(!mFactoryData.dac.dac_cert.value, CHIP_ERROR_PERSISTED_STORAGE_VALUE_NOT_FOUND);

        memcpy(outBuffer.data(), mFactoryData.dac.dac_cert.value, mFactoryData.dac.dac_cert.len);

        outBuffer.reduce_size(mFactoryData.dac.dac_cert.len);
        err = CHIP_NO_ERROR;
    }
    else
    {
        err = CopySpanToMutableSpan(ByteSpan(kDacCert), outBuffer);
    }

    return err;
}

CHIP_ERROR FactoryDataProvider::GetProductAttestationIntermediateCert(MutableByteSpan & outBuffer)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    if (kReadFromFlash)
    {
        ReturnErrorCodeIf(outBuffer.size() < mFactoryData.dac.pai_cert.len, CHIP_ERROR_BUFFER_TOO_SMALL);
        ReturnErrorCodeIf(!mFactoryData.dac.pai_cert.value, CHIP_ERROR_PERSISTED_STORAGE_VALUE_NOT_FOUND);

        memcpy(outBuffer.data(), mFactoryData.dac.pai_cert.value, mFactoryData.dac.pai_cert.len);

        outBuffer.reduce_size(mFactoryData.dac.pai_cert.len);
        err = CHIP_NO_ERROR;
    }
    else
    {
        err = CopySpanToMutableSpan(ByteSpan{ kPaiCert }, outBuffer);
    }

    return err;
}

CHIP_ERROR FactoryDataProvider::SignWithDeviceAttestationKey(const ByteSpan & messageToSign, MutableByteSpan & outSignBuffer)
{
    Crypto::P256ECDSASignature signature;
    Crypto::P256Keypair keypair;

    VerifyOrReturnError(IsSpanUsable(outSignBuffer), CHIP_ERROR_INVALID_ARGUMENT);
    VerifyOrReturnError(IsSpanUsable(messageToSign), CHIP_ERROR_INVALID_ARGUMENT);
    VerifyOrReturnError(outSignBuffer.size() >= signature.Capacity(), CHIP_ERROR_BUFFER_TOO_SMALL);

    if (kReadFromFlash)
    {
        ReturnErrorCodeIf(!mFactoryData.dac.dac_cert.value, CHIP_ERROR_PERSISTED_STORAGE_VALUE_NOT_FOUND);
        ReturnErrorCodeIf(!mFactoryData.dac.dac_key.value, CHIP_ERROR_PERSISTED_STORAGE_VALUE_NOT_FOUND);
        // Extract public key from DAC cert.
        ByteSpan dacCertSpan{ reinterpret_cast<uint8_t *>(mFactoryData.dac.dac_cert.value), mFactoryData.dac.dac_cert.len };
        chip::Crypto::P256PublicKey dacPublicKey;

        ReturnErrorOnFailure(chip::Crypto::ExtractPubkeyFromX509Cert(dacCertSpan, dacPublicKey));
        ReturnErrorOnFailure(
            LoadKeypairFromRaw(ByteSpan(reinterpret_cast<uint8_t *>(mFactoryData.dac.dac_key.value), mFactoryData.dac.dac_key.len),
                               ByteSpan(dacPublicKey.Bytes(), dacPublicKey.Length()), keypair));
    }
    else
    {
        ReturnErrorOnFailure(LoadKeypairFromRaw(ByteSpan(kDacPrivateKey), ByteSpan(kDacPublicKey), keypair));
    }

    ReturnErrorOnFailure(keypair.ECDSA_sign_msg(messageToSign.data(), messageToSign.size(), signature));

    return CopySpanToMutableSpan(ByteSpan{ signature.ConstBytes(), signature.Length() }, outSignBuffer);
}

CHIP_ERROR FactoryDataProvider::GetSetupDiscriminator(uint16_t & setupDiscriminator)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    if (kReadFromFlash)
    {
        setupDiscriminator = mFactoryData.cdata.discriminator;
        err                = CHIP_NO_ERROR;
    }
    else
    {
#if defined(CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR) && CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR
        uint32_t val;
        val                = CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR;
        setupDiscriminator = static_cast<uint16_t>(val);
        err                = CHIP_NO_ERROR;
#endif // defined(CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR) && CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR
    }

    return err;
}

CHIP_ERROR FactoryDataProvider::SetSetupDiscriminator(uint16_t setupDiscriminator)
{
    return CHIP_ERROR_NOT_IMPLEMENTED;
}

CHIP_ERROR FactoryDataProvider::GetSpake2pIterationCount(uint32_t & iterationCount)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    if (kReadFromFlash)
    {
        ReturnErrorCodeIf(mFactoryData.cdata.spake2_it == 0, CHIP_ERROR_PERSISTED_STORAGE_VALUE_NOT_FOUND);
        iterationCount = mFactoryData.cdata.spake2_it;
        err            = CHIP_NO_ERROR;
    }
    else
    {
#if defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_ITERATION_COUNT) && CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_ITERATION_COUNT
        iterationCount = CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_ITERATION_COUNT;
        err            = CHIP_NO_ERROR;
#endif // defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_ITERATION_COUNT) && CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_ITERATION_COUNT
    }

    return err;
}

CHIP_ERROR FactoryDataProvider::GetSpake2pSalt(MutableByteSpan & saltBuf)
{
    static constexpr size_t kSpake2pSalt_MaxBase64Len = BASE64_ENCODED_LEN(chip::Crypto::kSpake2p_Max_PBKDF_Salt_Length) + 1;

    CHIP_ERROR err                          = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;
    char saltB64[kSpake2pSalt_MaxBase64Len] = { 0 };
    size_t saltB64Len                       = 0;

    if (kReadFromFlash)
    {
        saltB64Len = mFactoryData.cdata.spake2_salt.len;
        ReturnErrorCodeIf(saltB64Len > sizeof(saltB64), CHIP_ERROR_BUFFER_TOO_SMALL);
        memcpy(saltB64, mFactoryData.cdata.spake2_salt.value, saltB64Len);
        err = CHIP_NO_ERROR;
    }
    else
    {
#if defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_SALT)
        saltB64Len = strlen(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_SALT);
        ReturnErrorCodeIf(saltB64Len > sizeof(saltB64), CHIP_ERROR_BUFFER_TOO_SMALL);
        memcpy(saltB64, CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_SALT, saltB64Len);
        err = CHIP_NO_ERROR;
#endif // defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_SALT)
    }

    ReturnErrorOnFailure(err);
    size_t saltLen = chip::Base64Decode32(saltB64, saltB64Len, reinterpret_cast<uint8_t *>(saltB64));

    ReturnErrorCodeIf(saltLen > saltBuf.size(), CHIP_ERROR_BUFFER_TOO_SMALL);
    memcpy(saltBuf.data(), saltB64, saltLen);
    saltBuf.reduce_size(saltLen);

    return CHIP_NO_ERROR;
}

CHIP_ERROR FactoryDataProvider::GetSpake2pVerifier(MutableByteSpan & verifierBuf, size_t & verifierLen)
{
    static constexpr size_t kSpake2pSerializedVerifier_MaxBase64Len =
        BASE64_ENCODED_LEN(chip::Crypto::kSpake2p_VerifierSerialized_Length) + 1;

    CHIP_ERROR err                                            = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;
    char verifierB64[kSpake2pSerializedVerifier_MaxBase64Len] = { 0 };
    size_t verifierB64Len                                     = 0;

    if (kReadFromFlash)
    {
        verifierB64Len = mFactoryData.cdata.spake2_verifier.len;
        ReturnErrorCodeIf(verifierB64Len > sizeof(verifierB64), CHIP_ERROR_BUFFER_TOO_SMALL);
        memcpy(verifierB64, mFactoryData.cdata.spake2_verifier.value, verifierB64Len);
        err = CHIP_NO_ERROR;
    }
    else
    {
#if defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_VERIFIER)
        verifierB64Len = strlen(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_VERIFIER);
        ReturnErrorCodeIf(verifierB64Len > sizeof(verifierB64), CHIP_ERROR_BUFFER_TOO_SMALL);
        memcpy(verifierB64, CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_VERIFIER, verifierB64Len);
        err = CHIP_NO_ERROR;
#endif // defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_VERIFIER)
    }

    ReturnErrorOnFailure(err);
    verifierLen = chip::Base64Decode32(verifierB64, verifierB64Len, reinterpret_cast<uint8_t *>(verifierB64));
    ReturnErrorCodeIf(verifierLen > verifierBuf.size(), CHIP_ERROR_BUFFER_TOO_SMALL);
    memcpy(verifierBuf.data(), verifierB64, verifierLen);
    verifierBuf.reduce_size(verifierLen);

    return err;
}

CHIP_ERROR FactoryDataProvider::GetSetupPasscode(uint32_t & setupPasscode)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    if (kReadFromFlash)
    {
        ReturnErrorCodeIf(mFactoryData.cdata.passcode == 0, CHIP_ERROR_PERSISTED_STORAGE_VALUE_NOT_FOUND);
        setupPasscode = mFactoryData.cdata.passcode;
        err           = CHIP_NO_ERROR;
    }
    else
    {
#if defined(CHIP_DEVICE_CONFIG_USE_TEST_SETUP_PIN_CODE) && CHIP_DEVICE_CONFIG_USE_TEST_SETUP_PIN_CODE
        setupPasscode = CHIP_DEVICE_CONFIG_USE_TEST_SETUP_PIN_CODE;
        err           = CHIP_NO_ERROR;
#endif // defined(CHIP_DEVICE_CONFIG_USE_TEST_SETUP_PIN_CODE) && CHIP_DEVICE_CONFIG_USE_TEST_SETUP_PIN_CODE
    }

    return err;
}

CHIP_ERROR FactoryDataProvider::SetSetupPasscode(uint32_t setupPasscode)
{
    return CHIP_ERROR_NOT_IMPLEMENTED;
}

CHIP_ERROR FactoryDataProvider::GetVendorName(char * buf, size_t bufSize)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    if (kReadFromFlash)
    {
        ReturnErrorCodeIf(bufSize < mFactoryData.dii.vendor_name.len + 1, CHIP_ERROR_BUFFER_TOO_SMALL);
        ReturnErrorCodeIf(!mFactoryData.dii.vendor_name.value, CHIP_ERROR_PERSISTED_STORAGE_VALUE_NOT_FOUND);
        memcpy(buf, mFactoryData.dii.vendor_name.value, mFactoryData.dii.vendor_name.len);
        buf[mFactoryData.dii.vendor_name.len] = 0;
        err                                   = CHIP_NO_ERROR;
    }
    else
    {
        ReturnErrorCodeIf(bufSize < sizeof(CHIP_DEVICE_CONFIG_DEVICE_VENDOR_NAME), CHIP_ERROR_BUFFER_TOO_SMALL);
        strcpy(buf, CHIP_DEVICE_CONFIG_DEVICE_VENDOR_NAME);
        err = CHIP_NO_ERROR;
    }

    return err;
}

CHIP_ERROR FactoryDataProvider::GetVendorId(uint16_t & vendorId)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    if (kReadFromFlash)
    {
        vendorId = mFactoryData.dii.vendor_id;
        err      = CHIP_NO_ERROR;
    }
    else
    {
        vendorId = static_cast<uint16_t>(CHIP_DEVICE_CONFIG_DEVICE_VENDOR_ID);
        err      = CHIP_NO_ERROR;
    }

    return err;
}

CHIP_ERROR FactoryDataProvider::GetProductName(char * buf, size_t bufSize)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    if (kReadFromFlash)
    {
        ReturnErrorCodeIf(bufSize < mFactoryData.dii.product_name.len + 1, CHIP_ERROR_BUFFER_TOO_SMALL);
        ReturnErrorCodeIf(!mFactoryData.dii.product_name.value, CHIP_ERROR_PERSISTED_STORAGE_VALUE_NOT_FOUND);
        memcpy(buf, mFactoryData.dii.product_name.value, mFactoryData.dii.product_name.len);
        buf[mFactoryData.dii.product_name.len] = 0;
        err                                    = CHIP_NO_ERROR;
    }
    else
    {
        ReturnErrorCodeIf(bufSize < sizeof(CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_NAME), CHIP_ERROR_BUFFER_TOO_SMALL);
        strcpy(buf, CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_NAME);
        err = CHIP_NO_ERROR;
    }

    return err;
}

CHIP_ERROR FactoryDataProvider::GetProductId(uint16_t & productId)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    if (kReadFromFlash)
    {
        productId = mFactoryData.dii.product_id;
        err       = CHIP_NO_ERROR;
    }
    else
    {
        productId = static_cast<uint16_t>(CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_ID);
        err       = CHIP_NO_ERROR;
    }

    return err;
}

CHIP_ERROR FactoryDataProvider::GetPartNumber(char * buf, size_t bufSize)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

CHIP_ERROR FactoryDataProvider::GetProductURL(char * buf, size_t bufSize)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

CHIP_ERROR FactoryDataProvider::GetProductLabel(char * buf, size_t bufSize)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

CHIP_ERROR FactoryDataProvider::GetSerialNumber(char * buf, size_t bufSize)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    size_t serialNumLen = 0; // without counting null-terminator

    if (kReadFromFlash)
    {
        ReturnErrorCodeIf(bufSize < mFactoryData.dii.serial_num.len + 1, CHIP_ERROR_BUFFER_TOO_SMALL);
        ReturnErrorCodeIf(!mFactoryData.dii.serial_num.value, CHIP_ERROR_PERSISTED_STORAGE_VALUE_NOT_FOUND);
        memcpy(buf, mFactoryData.dii.serial_num.value, mFactoryData.dii.serial_num.len);
        buf[mFactoryData.dii.serial_num.len] = 0;
        err                                  = CHIP_NO_ERROR;
    }
    else
    {
#ifdef CHIP_DEVICE_CONFIG_TEST_SERIAL_NUMBER
        if (CHIP_DEVICE_CONFIG_TEST_SERIAL_NUMBER[0] != 0)
        {
            ReturnErrorCodeIf(sizeof(CHIP_DEVICE_CONFIG_TEST_SERIAL_NUMBER) > bufSize, CHIP_ERROR_BUFFER_TOO_SMALL);
            memcpy(buf, CHIP_DEVICE_CONFIG_TEST_SERIAL_NUMBER, sizeof(CHIP_DEVICE_CONFIG_TEST_SERIAL_NUMBER));
            serialNumLen = sizeof(CHIP_DEVICE_CONFIG_TEST_SERIAL_NUMBER) - 1;
            err          = CHIP_NO_ERROR;
        }
#endif // CHIP_DEVICE_CONFIG_TEST_SERIAL_NUMBER

        ReturnErrorCodeIf(serialNumLen >= bufSize, CHIP_ERROR_BUFFER_TOO_SMALL);
        ReturnErrorCodeIf(buf[serialNumLen] != 0, CHIP_ERROR_INVALID_STRING_LENGTH);

        err = CHIP_NO_ERROR;
    }

    return err;
}

CHIP_ERROR FactoryDataProvider::GetManufacturingDate(uint16_t & year, uint8_t & month, uint8_t & day)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    enum
    {
        kDateStringLength = 10 // YYYY-MM-DD
    };

    if (kReadFromFlash)
    {
        char * parseEnd;
        size_t dateLen;
        dateLen = mFactoryData.dii.mfg_date.len;
        VerifyOrExit(dateLen == kDateStringLength, err = CHIP_ERROR_INVALID_ARGUMENT);

        // Cast does not lose information, because we then check that we only parsed
        // 4 digits, so our number can't be bigger than 9999.
        year = static_cast<uint16_t>(strtoul((char *) mFactoryData.dii.mfg_date.value, &parseEnd, 10));
        VerifyOrExit(parseEnd == (char *) mFactoryData.dii.mfg_date.value + 4, err = CHIP_ERROR_INVALID_ARGUMENT);

        // Cast does not lose information, because we then check that we only parsed
        // 2 digits, so our number can't be bigger than 99.
        month = static_cast<uint8_t>(strtoul((char *) mFactoryData.dii.mfg_date.value + 5, &parseEnd, 10));
        VerifyOrExit(parseEnd == (char *) mFactoryData.dii.mfg_date.value + 7, err = CHIP_ERROR_INVALID_ARGUMENT);

        // Cast does not lose information, because we then check that we only parsed
        // 2 digits, so our number can't be bigger than 99.
        day = static_cast<uint8_t>(strtoul((char *) mFactoryData.dii.mfg_date.value + 8, &parseEnd, 10));
        VerifyOrExit(parseEnd == (char *) mFactoryData.dii.mfg_date.value + 10, err = CHIP_ERROR_INVALID_ARGUMENT);

        err = CHIP_NO_ERROR;
    }
    else
    {
        err = CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
    }

exit:
    if (err != CHIP_NO_ERROR && err != CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND && err != CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE)
    {
        ChipLogError(DeviceLayer, "Invalid manufacturing date: %s", mFactoryData.dii.mfg_date.value);
    }
    return err;
}

CHIP_ERROR FactoryDataProvider::GetHardwareVersion(uint16_t & hardwareVersion)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    if (kReadFromFlash)
    {
        hardwareVersion = mFactoryData.dii.hw_ver;
        err             = CHIP_NO_ERROR;
    }
    else
    {
        err = CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
    }

    return err;
}

CHIP_ERROR FactoryDataProvider::GetHardwareVersionString(char * buf, size_t bufSize)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    if (kReadFromFlash)
    {
        ReturnErrorCodeIf(bufSize < mFactoryData.dii.hw_ver_string.len + 1, CHIP_ERROR_BUFFER_TOO_SMALL);
        ReturnErrorCodeIf(!mFactoryData.dii.hw_ver_string.value, CHIP_ERROR_PERSISTED_STORAGE_VALUE_NOT_FOUND);
        memcpy(buf, mFactoryData.dii.hw_ver_string.value, mFactoryData.dii.hw_ver_string.len);
        buf[mFactoryData.dii.hw_ver_string.len] = 0;
        err                                     = CHIP_NO_ERROR;
    }
    else
    {
        ReturnErrorCodeIf(bufSize < sizeof(CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION_STRING), CHIP_ERROR_BUFFER_TOO_SMALL);
        strcpy(buf, CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION_STRING);
        err = CHIP_NO_ERROR;
    }

    return err;
}

CHIP_ERROR FactoryDataProvider::GetRotatingDeviceIdUniqueId(MutableByteSpan & uniqueIdSpan)
{
    CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;

    if (kReadFromFlash)
    {
        ReturnErrorCodeIf(uniqueIdSpan.size() < mFactoryData.dii.rd_id_uid.len, CHIP_ERROR_BUFFER_TOO_SMALL);
        ReturnErrorCodeIf(!mFactoryData.dii.rd_id_uid.value, CHIP_ERROR_PERSISTED_STORAGE_VALUE_NOT_FOUND);
        memcpy(uniqueIdSpan.data(), mFactoryData.dii.rd_id_uid.value, mFactoryData.dii.rd_id_uid.len);
        err = CHIP_NO_ERROR;
    }
    else
    {
        err = CHIP_ERROR_WRONG_KEY_TYPE;
#if CHIP_ENABLE_ROTATING_DEVICE_ID && defined(CHIP_DEVICE_CONFIG_ROTATING_DEVICE_ID_UNIQUE_ID)
        static_assert(ConfigurationManager::kRotatingDeviceIDUniqueIDLength >=
                          ConfigurationManager::kMinRotatingDeviceIDUniqueIDLength,
                      "Length of unique ID for rotating device ID is smaller than minimum.");
        constexpr uint8_t uniqueId[] = CHIP_DEVICE_CONFIG_ROTATING_DEVICE_ID_UNIQUE_ID;

        ReturnErrorCodeIf(sizeof(uniqueId) > uniqueIdSpan.size(), CHIP_ERROR_BUFFER_TOO_SMALL);
        ReturnErrorCodeIf(sizeof(uniqueId) != ConfigurationManager::kRotatingDeviceIDUniqueIDLength, CHIP_ERROR_BUFFER_TOO_SMALL);
        memcpy(uniqueIdSpan.data(), uniqueId, sizeof(uniqueId));
        uniqueIdSpan.reduce_size(sizeof(uniqueId));
        err = CHIP_NO_ERROR;
#endif
    }

    return err;
}

} // namespace DeviceLayer
} // namespace chip