examples/platform/silabs/SilabsDeviceDataProvider.cpp - third_party/github/project-chip/connectedhomeip - Git at Google

 /*
  *
  *    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 "SilabsDeviceDataProvider.h"
 #include <crypto/CHIPCryptoPAL.h>
 #include <lib/support/Base64.h>
 #include <lib/support/CHIPMemString.h>
 #include <platform/silabs/SilabsConfig.h>
 #include <setup_payload/Base38Encode.h>
 #include <setup_payload/SetupPayload.h>

 #ifdef SIWX917_USE_COMISSIONABLE_DATA
 #include "DeviceConfig.h"
 #include "silabs_utils.h"
 #include <setup_payload/Base38Decode.h>
 #include <setup_payload/QRCodeSetupPayloadGenerator.h>
 #endif // SIWX917_USE_COMISSIONABLE_DATA

 namespace chip {
 namespace DeviceLayer {
 namespace Silabs {

 // using namespace chip::Credentials;
 using namespace chip::DeviceLayer::Internal;

 // TODO Remove once Commander supports (doesn't erase) NVM3 for 917
 #ifdef SIWX917_USE_COMISSIONABLE_DATA
 void SilabsDeviceDataProvider::setupPayload(uint8_t * outBuf)
 {
     SetupPayload payload;
     std::string result;
     ChipError err   = CHIP_NO_ERROR;
     payload.version = 0;
     payload.discriminator.SetLongValue(discriminatorValue);
     payload.setUpPINCode = passcode;
     payload.rendezvousInformation.SetValue(static_cast<RendezvousInformationFlags>(rendezvousFlag));
     payload.commissioningFlow = static_cast<CommissioningFlow>(commissionableFlow);
     payload.vendorID          = vendorId;
     payload.productID         = productId;

     QRCodeSetupPayloadGenerator generator(payload);
     err = generator.payloadBase38Representation(result);
     if (err != CHIP_NO_ERROR)
     {
         SILABS_LOG("Failed to get the payload: %d", err);
     }
     SILABS_LOG("Payload value in string format : %s", result.c_str());
     std::vector<uint8_t> result1;
     // skipping the MT: from the payload during decoding
     err = base38Decode(result.substr(3), result1);
     if (err == CHIP_NO_ERROR)
     {
         for (uint8_t i = 0; i < result1.size(); i++)
         {
             outBuf[i] = result1.at(i);
         }
     }
 }

 // writing to the flash based on the value given in the DeviceConfig.h
 CHIP_ERROR SilabsDeviceDataProvider::FlashFactoryData()
 {
     // flashing the value to the nvm3 section of the flash
     // TODO: remove this once it is removed SiWx917 have the nvm3 simiplicity commander support
     CHIP_ERROR err;
     // Checking for the value of CM and flag
     if ((commissionableFlow > 3) || (rendezvousFlag > 7))
     {
         return CHIP_ERROR_INTERNAL;
     }
     if (discriminatorValue != 0)
     {
         err = SilabsConfig::WriteConfigValue(SilabsConfig::kConfigKey_SetupDiscriminator, discriminatorValue);
         if (err != CHIP_NO_ERROR)
         {
             return err;
         }
     }
     uint8_t payload[kTotalPayloadDataSizeInBytes];
     setupPayload(payload);
     err = SilabsConfig::WriteConfigValueBin(SilabsConfig::kConfigKey_SetupPayloadBitSet, payload, kTotalPayloadDataSizeInBytes);
     if (err != CHIP_NO_ERROR)
     {
         return err;
     }
     if (spake2Interation != 0)
     {
         err = SilabsConfig::WriteConfigValue(SilabsConfig::kConfigKey_Spake2pIterationCount, spake2Interation);
         if (err != CHIP_NO_ERROR)
         {
             return err;
         }
     }
     if (spake2Salt != NULL)
     {
         err = SilabsConfig::WriteConfigValueStr(SilabsConfig::kConfigKey_Spake2pSalt, spake2Salt);
         if (err != CHIP_NO_ERROR)
         {
             return err;
         }
     }
     if (spake2Verifier != NULL)
     {
         err = SilabsConfig::WriteConfigValueStr(SilabsConfig::kConfigKey_Spake2pVerifier, spake2Verifier);
         if (err != CHIP_NO_ERROR)
         {
             return err;
         }
     }
     if (productId != 0)
     {
         err = SilabsConfig::WriteConfigValue(SilabsConfig::kConfigKey_ProductId, productId);
         if (err != CHIP_NO_ERROR)
         {
             return err;
         }
     }
     if (vendorId != 0)
     {
         err = SilabsConfig::WriteConfigValue(SilabsConfig::kConfigKey_VendorId, vendorId);
         if (err != CHIP_NO_ERROR)
         {
             return err;
         }
     }
     if (strlen(productName) != 0)
     {
         err = SilabsConfig::WriteConfigValueStr(SilabsConfig::kConfigKey_ProductName, productName);
         if (err != CHIP_NO_ERROR)
         {
             return err;
         }
     }
     if (strlen(vendorName) != 0)
     {
         err = SilabsConfig::WriteConfigValueStr(SilabsConfig::kConfigKey_VendorName, vendorName);
         if (err != CHIP_NO_ERROR)
         {
             return err;
         }
     }
     if (strlen(hwVersionString) != 0)
     {
         err = SilabsConfig::WriteConfigValueStr(SilabsConfig::kConfigKey_HardwareVersionString, hwVersionString);
         if (err != CHIP_NO_ERROR)
         {
             return err;
         }
     }
     if (rotatingId != 0)
     {
         err = SilabsConfig::WriteConfigValue(SilabsConfig::kConfigKey_UniqueId, rotatingId);
         if (err != CHIP_NO_ERROR)
         {
             return err;
         }
     }
     return CHIP_NO_ERROR;
 }
 #endif

 CHIP_ERROR SilabsDeviceDataProvider::GetSetupDiscriminator(uint16_t & setupDiscriminator)
 {
     CHIP_ERROR err;
     uint32_t setupDiscriminator32;

     err = SilabsConfig::ReadConfigValue(SilabsConfig::kConfigKey_SetupDiscriminator, setupDiscriminator32);
 #if defined(CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR) && CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR
     if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
     {
         setupDiscriminator32 = CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR;
         err                  = CHIP_NO_ERROR;
     }
 #endif // defined(CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR) && CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR

     VerifyOrReturnLogError(setupDiscriminator32 <= kMaxDiscriminatorValue, CHIP_ERROR_INVALID_ARGUMENT);
     setupDiscriminator = static_cast<uint16_t>(setupDiscriminator32);
     return CHIP_NO_ERROR;
 }

 CHIP_ERROR SilabsDeviceDataProvider::GetSpake2pIterationCount(uint32_t & iterationCount)
 {
     CHIP_ERROR err = SilabsConfig::ReadConfigValue(SilabsConfig::kConfigKey_Spake2pIterationCount, iterationCount);

 #if defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_ITERATION_COUNT) && CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_ITERATION_COUNT
     if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
     {
         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 SilabsDeviceDataProvider::GetSpake2pSalt(MutableByteSpan & saltBuf)
 {
     static constexpr size_t kSpake2pSalt_MaxBase64Len = BASE64_ENCODED_LEN(chip::Crypto::kSpake2p_Max_PBKDF_Salt_Length) + 1;

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

     err = SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_Spake2pSalt, saltB64, sizeof(saltB64), saltB64Len);

 #if defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_SALT)
     if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
     {
         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);

     uint8_t saltByteArray[kSpake2pSalt_MaxBase64Len] = { 0 };
     size_t saltLen                                   = chip::Base64Decode32(saltB64, saltB64Len, saltByteArray);
     ReturnErrorCodeIf(saltLen > saltBuf.size(), CHIP_ERROR_BUFFER_TOO_SMALL);

     memcpy(saltBuf.data(), saltByteArray, saltLen);
     saltBuf.reduce_size(saltLen);

     return CHIP_NO_ERROR;
 }

 CHIP_ERROR SilabsDeviceDataProvider::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_NO_ERROR;
     char verifierB64[kSpake2pSerializedVerifier_MaxBase64Len] = { 0 };
     size_t verifierB64Len                                     = 0;

     err = SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_Spake2pVerifier, verifierB64, sizeof(verifierB64),
                                            verifierB64Len);

 #if defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_VERIFIER)
     if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
     {
         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 CHIP_NO_ERROR;
 }

 CHIP_ERROR SilabsDeviceDataProvider::GetSetupPayload(MutableCharSpan & payloadBuf)
 {
     CHIP_ERROR err                                      = CHIP_NO_ERROR;
     uint8_t payloadBitSet[kTotalPayloadDataSizeInBytes] = { 0 };
     size_t bitSetLen                                    = 0;

     err = SilabsConfig::ReadConfigValueBin(SilabsConfig::kConfigKey_SetupPayloadBitSet, payloadBitSet, kTotalPayloadDataSizeInBytes,
                                            bitSetLen);

 #if defined(CHIP_DEVICE_CONFIG_USE_TEST_SETUP_PIN_CODE) && CHIP_DEVICE_CONFIG_USE_TEST_SETUP_PIN_CODE
     if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
     {
         static constexpr uint8_t kTestSetupPayloadBitset[] = { 0x88, 0xFF, 0x2F, 0x00, 0x44, 0x00, 0xE0, 0x4B, 0x84, 0x68, 0x02 };
         bitSetLen                                          = sizeof(kTestSetupPayloadBitset);
         ReturnErrorCodeIf(bitSetLen > kTotalPayloadDataSizeInBytes, CHIP_ERROR_BUFFER_TOO_SMALL);
         memcpy(payloadBitSet, kTestSetupPayloadBitset, bitSetLen);
         err = CHIP_NO_ERROR;
     }
 #endif // defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_VERIFIER)

     ReturnErrorOnFailure(err);

     size_t prefixLen = strlen(kQRCodePrefix);

     if (payloadBuf.size() < prefixLen + 1)
     {
         err = CHIP_ERROR_BUFFER_TOO_SMALL;
     }
     else
     {
         MutableCharSpan subSpan = payloadBuf.SubSpan(prefixLen, payloadBuf.size() - prefixLen);
         memcpy(payloadBuf.data(), kQRCodePrefix, prefixLen);
         err = base38Encode(MutableByteSpan(payloadBitSet), subSpan);
         // Reduce output span size to be the size of written data
         payloadBuf.reduce_size(subSpan.size() + prefixLen);
     }

     return err;
 }

 CHIP_ERROR SilabsDeviceDataProvider::GetVendorName(char * buf, size_t bufSize)
 {
     size_t vendorNameLen = 0; // without counting null-terminator
     CHIP_ERROR err       = SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_VendorName, buf, bufSize, vendorNameLen);
 #if defined(CHIP_DEVICE_CONFIG_TEST_VENDOR_NAME)
     if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
     {
         VerifyOrReturnError(buf != nullptr, CHIP_ERROR_NO_MEMORY);
         VerifyOrReturnError(bufSize > strlen(CHIP_DEVICE_CONFIG_TEST_VENDOR_NAME), CHIP_ERROR_BUFFER_TOO_SMALL);
         Platform::CopyString(buf, bufSize, CHIP_DEVICE_CONFIG_TEST_VENDOR_NAME);
         err = CHIP_NO_ERROR;
     }
 #endif
     return err;
 }

 CHIP_ERROR SilabsDeviceDataProvider::GetVendorId(uint16_t & vendorId)
 {
     ChipError err       = CHIP_NO_ERROR;
     uint32_t vendorId32 = 0;

     err = SilabsConfig::ReadConfigValue(SilabsConfig::kConfigKey_VendorId, vendorId32);

 #if defined(CHIP_DEVICE_CONFIG_DEVICE_VENDOR_ID) && CHIP_DEVICE_CONFIG_DEVICE_VENDOR_ID
     if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
     {
         vendorId32 = CHIP_DEVICE_CONFIG_DEVICE_VENDOR_ID;
         err        = CHIP_NO_ERROR;
     }
 #endif // defined(CHIP_DEVICE_CONFIG_DEVICE_VENDOR_ID) && CHIP_DEVICE_CONFIG_DEVICE_VENDOR_ID

     ReturnErrorOnFailure(err);
     vendorId = static_cast<uint16_t>(vendorId32);
     return err;
 }

 CHIP_ERROR SilabsDeviceDataProvider::GetProductName(char * buf, size_t bufSize)
 {
     size_t productNameLen = 0; // without counting null-terminator
     CHIP_ERROR err        = SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_ProductName, buf, bufSize, productNameLen);
 #if defined(CHIP_DEVICE_CONFIG_TEST_PRODUCT_NAME)
     if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
     {
         VerifyOrReturnError(buf != nullptr, CHIP_ERROR_NO_MEMORY);
         VerifyOrReturnError(bufSize > strlen(CHIP_DEVICE_CONFIG_TEST_VENDOR_NAME), CHIP_ERROR_BUFFER_TOO_SMALL);
         Platform::CopyString(buf, bufSize, CHIP_DEVICE_CONFIG_TEST_PRODUCT_NAME);
         err = CHIP_NO_ERROR;
     }
 #endif
     return err;
 }

 CHIP_ERROR SilabsDeviceDataProvider::GetProductId(uint16_t & productId)
 {
     ChipError err        = CHIP_NO_ERROR;
     uint32_t productId32 = 0;

     err = SilabsConfig::ReadConfigValue(SilabsConfig::kConfigKey_ProductId, productId32);

 #if defined(CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_ID) && CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_ID
     if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
     {
         productId32 = CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_ID;
         err         = CHIP_NO_ERROR;
     }
 #endif // defined(CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_ID) && CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_ID
     ReturnErrorOnFailure(err);

     productId = static_cast<uint16_t>(productId32);
     return err;
 }

 CHIP_ERROR SilabsDeviceDataProvider::GetHardwareVersionString(char * buf, size_t bufSize)
 {
     size_t hardwareVersionStringLen = 0; // without counting null-terminator
     CHIP_ERROR err =
         SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_HardwareVersionString, buf, bufSize, hardwareVersionStringLen);
 #if defined(CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION_STRING)
     if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
     {
         VerifyOrReturnError(buf != nullptr, CHIP_ERROR_NO_MEMORY);
         VerifyOrReturnError(bufSize > strlen(CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION_STRING),
                             CHIP_ERROR_BUFFER_TOO_SMALL);
         Platform::CopyString(buf, bufSize, CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION_STRING);
         err = CHIP_NO_ERROR;
     }
 #endif // CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION_STRING
     return err;
 }

 CHIP_ERROR SilabsDeviceDataProvider::GetHardwareVersion(uint16_t & hardwareVersion)
 {
     CHIP_ERROR err;
     uint32_t hardwareVersion32;

     err = SilabsConfig::ReadConfigValue(SilabsConfig::kConfigKey_HardwareVersion, hardwareVersion32);
 #if defined(CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION)
     if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
     {
         hardwareVersion32 = CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION;
         err               = CHIP_NO_ERROR;
     }
 #endif // defined(CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION)

     hardwareVersion = static_cast<uint16_t>(hardwareVersion32);
     return err;
 }

 CHIP_ERROR SilabsDeviceDataProvider::GetRotatingDeviceIdUniqueId(MutableByteSpan & uniqueIdSpan)
 {
     ChipError err = CHIP_ERROR_WRONG_KEY_TYPE;
 #if CHIP_ENABLE_ROTATING_DEVICE_ID
     static_assert(ConfigurationManager::kRotatingDeviceIDUniqueIDLength >= ConfigurationManager::kMinRotatingDeviceIDUniqueIDLength,
                   "Length of unique ID for rotating device ID is smaller than minimum.");

     size_t uniqueIdLen = 0;
     err =
         SilabsConfig::ReadConfigValueBin(SilabsConfig::kConfigKey_UniqueId, uniqueIdSpan.data(), uniqueIdSpan.size(), uniqueIdLen);
 #ifdef CHIP_DEVICE_CONFIG_ROTATING_DEVICE_ID_UNIQUE_ID
     if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
     {
         constexpr uint8_t uniqueId[] = CHIP_DEVICE_CONFIG_ROTATING_DEVICE_ID_UNIQUE_ID;

         ReturnErrorCodeIf(sizeof(uniqueId) > uniqueIdSpan.size(), CHIP_ERROR_BUFFER_TOO_SMALL);
         memcpy(uniqueIdSpan.data(), uniqueId, sizeof(uniqueId));
         uniqueIdLen = sizeof(uniqueId);
     }
 #endif // CHIP_DEVICE_CONFIG_ROTATING_DEVICE_ID_UNIQUE_ID

     ReturnErrorOnFailure(err);
     uniqueIdSpan.reduce_size(uniqueIdLen);

 #endif // CHIP_ENABLE_ROTATING_DEVICE_ID
     return err;
 }

 CHIP_ERROR SilabsDeviceDataProvider::GetSerialNumber(char * buf, size_t bufSize)
 {
     size_t serialNumberLen = 0; // without counting null-terminator
     return SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_SerialNum, buf, bufSize, serialNumberLen);
 }

 CHIP_ERROR SilabsDeviceDataProvider::GetManufacturingDate(uint16_t & year, uint8_t & month, uint8_t & day)
 {
     CHIP_ERROR err;
     constexpr uint8_t kDateStringLength = 10; // YYYY-MM-DD
     char dateStr[kDateStringLength + 1];
     size_t dateLen;
     char * parseEnd;

     err = SilabsConfig::ReadConfigValueBin(SilabsConfig::kConfigKey_ManufacturingDate, reinterpret_cast<uint8_t *>(dateStr),
                                            sizeof(dateStr), dateLen);
     SuccessOrExit(err);

     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(dateStr, &parseEnd, 10));
     VerifyOrExit(parseEnd == dateStr + 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(dateStr + 5, &parseEnd, 10));
     VerifyOrExit(parseEnd == dateStr + 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(dateStr + 8, &parseEnd, 10));
     VerifyOrExit(parseEnd == dateStr + 10, err = CHIP_ERROR_INVALID_ARGUMENT);

 exit:
     if (err != CHIP_NO_ERROR && err != CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
     {
         ChipLogError(DeviceLayer, "Invalid manufacturing date: %s", dateStr);
     }
     return err;
 }

 CHIP_ERROR SilabsDeviceDataProvider::GetPartNumber(char * buf, size_t bufSize)
 {
     size_t partNumberLen = 0; // without counting null-terminator
     return SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_PartNumber, buf, bufSize, partNumberLen);
 }

 CHIP_ERROR SilabsDeviceDataProvider::GetProductURL(char * buf, size_t bufSize)
 {
     size_t productUrlLen = 0; // without counting null-terminator
     return SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_ProductURL, buf, bufSize, productUrlLen);
 }

 CHIP_ERROR SilabsDeviceDataProvider::GetProductLabel(char * buf, size_t bufSize)
 {
     size_t productLabelLen = 0; // without counting null-terminator
     return SilabsConfig::ReadConfigValueStr(SilabsConfig::KConfigKey_ProductLabel, buf, bufSize, productLabelLen);
 }

 SilabsDeviceDataProvider & SilabsDeviceDataProvider::GetDeviceDataProvider()
 {
     static SilabsDeviceDataProvider sDataProvider;
     return sDataProvider;
 }

 } // namespace Silabs
 } // namespace DeviceLayer
 } // namespace chip
	/*
	*
	* 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 "SilabsDeviceDataProvider.h"
	#include <crypto/CHIPCryptoPAL.h>
	#include <lib/support/Base64.h>
	#include <lib/support/CHIPMemString.h>
	#include <platform/silabs/SilabsConfig.h>
	#include <setup_payload/Base38Encode.h>
	#include <setup_payload/SetupPayload.h>

	#ifdef SIWX917_USE_COMISSIONABLE_DATA
	#include "DeviceConfig.h"
	#include "silabs_utils.h"
	#include <setup_payload/Base38Decode.h>
	#include <setup_payload/QRCodeSetupPayloadGenerator.h>
	#endif // SIWX917_USE_COMISSIONABLE_DATA

	namespace chip {
	namespace DeviceLayer {
	namespace Silabs {

	// using namespace chip::Credentials;
	using namespace chip::DeviceLayer::Internal;

	// TODO Remove once Commander supports (doesn't erase) NVM3 for 917
	#ifdef SIWX917_USE_COMISSIONABLE_DATA
	void SilabsDeviceDataProvider::setupPayload(uint8_t * outBuf)
	{
	SetupPayload payload;
	std::string result;
	ChipError err = CHIP_NO_ERROR;
	payload.version = 0;
	payload.discriminator.SetLongValue(discriminatorValue);
	payload.setUpPINCode = passcode;
	payload.rendezvousInformation.SetValue(static_cast<RendezvousInformationFlags>(rendezvousFlag));
	payload.commissioningFlow = static_cast<CommissioningFlow>(commissionableFlow);
	payload.vendorID = vendorId;
	payload.productID = productId;

	QRCodeSetupPayloadGenerator generator(payload);
	err = generator.payloadBase38Representation(result);
	if (err != CHIP_NO_ERROR)
	{
	SILABS_LOG("Failed to get the payload: %d", err);
	}
	SILABS_LOG("Payload value in string format : %s", result.c_str());
	std::vector<uint8_t> result1;
	// skipping the MT: from the payload during decoding
	err = base38Decode(result.substr(3), result1);
	if (err == CHIP_NO_ERROR)
	{
	for (uint8_t i = 0; i < result1.size(); i++)
	{
	outBuf[i] = result1.at(i);
	}
	}
	}

	// writing to the flash based on the value given in the DeviceConfig.h
	CHIP_ERROR SilabsDeviceDataProvider::FlashFactoryData()
	{
	// flashing the value to the nvm3 section of the flash
	// TODO: remove this once it is removed SiWx917 have the nvm3 simiplicity commander support
	CHIP_ERROR err;
	// Checking for the value of CM and flag
	if ((commissionableFlow > 3) \|\| (rendezvousFlag > 7))
	{
	return CHIP_ERROR_INTERNAL;
	}
	if (discriminatorValue != 0)
	{
	err = SilabsConfig::WriteConfigValue(SilabsConfig::kConfigKey_SetupDiscriminator, discriminatorValue);
	if (err != CHIP_NO_ERROR)
	{
	return err;
	}
	}
	uint8_t payload[kTotalPayloadDataSizeInBytes];
	setupPayload(payload);
	err = SilabsConfig::WriteConfigValueBin(SilabsConfig::kConfigKey_SetupPayloadBitSet, payload, kTotalPayloadDataSizeInBytes);
	if (err != CHIP_NO_ERROR)
	{
	return err;
	}
	if (spake2Interation != 0)
	{
	err = SilabsConfig::WriteConfigValue(SilabsConfig::kConfigKey_Spake2pIterationCount, spake2Interation);
	if (err != CHIP_NO_ERROR)
	{
	return err;
	}
	}
	if (spake2Salt != NULL)
	{
	err = SilabsConfig::WriteConfigValueStr(SilabsConfig::kConfigKey_Spake2pSalt, spake2Salt);
	if (err != CHIP_NO_ERROR)
	{
	return err;
	}
	}
	if (spake2Verifier != NULL)
	{
	err = SilabsConfig::WriteConfigValueStr(SilabsConfig::kConfigKey_Spake2pVerifier, spake2Verifier);
	if (err != CHIP_NO_ERROR)
	{
	return err;
	}
	}
	if (productId != 0)
	{
	err = SilabsConfig::WriteConfigValue(SilabsConfig::kConfigKey_ProductId, productId);
	if (err != CHIP_NO_ERROR)
	{
	return err;
	}
	}
	if (vendorId != 0)
	{
	err = SilabsConfig::WriteConfigValue(SilabsConfig::kConfigKey_VendorId, vendorId);
	if (err != CHIP_NO_ERROR)
	{
	return err;
	}
	}
	if (strlen(productName) != 0)
	{
	err = SilabsConfig::WriteConfigValueStr(SilabsConfig::kConfigKey_ProductName, productName);
	if (err != CHIP_NO_ERROR)
	{
	return err;
	}
	}
	if (strlen(vendorName) != 0)
	{
	err = SilabsConfig::WriteConfigValueStr(SilabsConfig::kConfigKey_VendorName, vendorName);
	if (err != CHIP_NO_ERROR)
	{
	return err;
	}
	}
	if (strlen(hwVersionString) != 0)
	{
	err = SilabsConfig::WriteConfigValueStr(SilabsConfig::kConfigKey_HardwareVersionString, hwVersionString);
	if (err != CHIP_NO_ERROR)
	{
	return err;
	}
	}
	if (rotatingId != 0)
	{
	err = SilabsConfig::WriteConfigValue(SilabsConfig::kConfigKey_UniqueId, rotatingId);
	if (err != CHIP_NO_ERROR)
	{
	return err;
	}
	}
	return CHIP_NO_ERROR;
	}
	#endif

	CHIP_ERROR SilabsDeviceDataProvider::GetSetupDiscriminator(uint16_t & setupDiscriminator)
	{
	CHIP_ERROR err;
	uint32_t setupDiscriminator32;

	err = SilabsConfig::ReadConfigValue(SilabsConfig::kConfigKey_SetupDiscriminator, setupDiscriminator32);
	#if defined(CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR) && CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR
	if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
	{
	setupDiscriminator32 = CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR;
	err = CHIP_NO_ERROR;
	}
	#endif // defined(CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR) && CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR

	VerifyOrReturnLogError(setupDiscriminator32 <= kMaxDiscriminatorValue, CHIP_ERROR_INVALID_ARGUMENT);
	setupDiscriminator = static_cast<uint16_t>(setupDiscriminator32);
	return CHIP_NO_ERROR;
	}

	CHIP_ERROR SilabsDeviceDataProvider::GetSpake2pIterationCount(uint32_t & iterationCount)
	{
	CHIP_ERROR err = SilabsConfig::ReadConfigValue(SilabsConfig::kConfigKey_Spake2pIterationCount, iterationCount);

	#if defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_ITERATION_COUNT) && CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_ITERATION_COUNT
	if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
	{
	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 SilabsDeviceDataProvider::GetSpake2pSalt(MutableByteSpan & saltBuf)
	{
	static constexpr size_t kSpake2pSalt_MaxBase64Len = BASE64_ENCODED_LEN(chip::Crypto::kSpake2p_Max_PBKDF_Salt_Length) + 1;

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

	err = SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_Spake2pSalt, saltB64, sizeof(saltB64), saltB64Len);

	#if defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_SALT)
	if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
	{
	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);

	uint8_t saltByteArray[kSpake2pSalt_MaxBase64Len] = { 0 };
	size_t saltLen = chip::Base64Decode32(saltB64, saltB64Len, saltByteArray);
	ReturnErrorCodeIf(saltLen > saltBuf.size(), CHIP_ERROR_BUFFER_TOO_SMALL);

	memcpy(saltBuf.data(), saltByteArray, saltLen);
	saltBuf.reduce_size(saltLen);

	return CHIP_NO_ERROR;
	}

	CHIP_ERROR SilabsDeviceDataProvider::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_NO_ERROR;
	char verifierB64[kSpake2pSerializedVerifier_MaxBase64Len] = { 0 };
	size_t verifierB64Len = 0;

	err = SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_Spake2pVerifier, verifierB64, sizeof(verifierB64),
	verifierB64Len);

	#if defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_VERIFIER)
	if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
	{
	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 CHIP_NO_ERROR;
	}

	CHIP_ERROR SilabsDeviceDataProvider::GetSetupPayload(MutableCharSpan & payloadBuf)
	{
	CHIP_ERROR err = CHIP_NO_ERROR;
	uint8_t payloadBitSet[kTotalPayloadDataSizeInBytes] = { 0 };
	size_t bitSetLen = 0;

	err = SilabsConfig::ReadConfigValueBin(SilabsConfig::kConfigKey_SetupPayloadBitSet, payloadBitSet, kTotalPayloadDataSizeInBytes,
	bitSetLen);

	#if defined(CHIP_DEVICE_CONFIG_USE_TEST_SETUP_PIN_CODE) && CHIP_DEVICE_CONFIG_USE_TEST_SETUP_PIN_CODE
	if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
	{
	static constexpr uint8_t kTestSetupPayloadBitset[] = { 0x88, 0xFF, 0x2F, 0x00, 0x44, 0x00, 0xE0, 0x4B, 0x84, 0x68, 0x02 };
	bitSetLen = sizeof(kTestSetupPayloadBitset);
	ReturnErrorCodeIf(bitSetLen > kTotalPayloadDataSizeInBytes, CHIP_ERROR_BUFFER_TOO_SMALL);
	memcpy(payloadBitSet, kTestSetupPayloadBitset, bitSetLen);
	err = CHIP_NO_ERROR;
	}
	#endif // defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_VERIFIER)

	ReturnErrorOnFailure(err);

	size_t prefixLen = strlen(kQRCodePrefix);

	if (payloadBuf.size() < prefixLen + 1)
	{
	err = CHIP_ERROR_BUFFER_TOO_SMALL;
	}
	else
	{
	MutableCharSpan subSpan = payloadBuf.SubSpan(prefixLen, payloadBuf.size() - prefixLen);
	memcpy(payloadBuf.data(), kQRCodePrefix, prefixLen);
	err = base38Encode(MutableByteSpan(payloadBitSet), subSpan);
	// Reduce output span size to be the size of written data
	payloadBuf.reduce_size(subSpan.size() + prefixLen);
	}

	return err;
	}

	CHIP_ERROR SilabsDeviceDataProvider::GetVendorName(char * buf, size_t bufSize)
	{
	size_t vendorNameLen = 0; // without counting null-terminator
	CHIP_ERROR err = SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_VendorName, buf, bufSize, vendorNameLen);
	#if defined(CHIP_DEVICE_CONFIG_TEST_VENDOR_NAME)
	if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
	{
	VerifyOrReturnError(buf != nullptr, CHIP_ERROR_NO_MEMORY);
	VerifyOrReturnError(bufSize > strlen(CHIP_DEVICE_CONFIG_TEST_VENDOR_NAME), CHIP_ERROR_BUFFER_TOO_SMALL);
	Platform::CopyString(buf, bufSize, CHIP_DEVICE_CONFIG_TEST_VENDOR_NAME);
	err = CHIP_NO_ERROR;
	}
	#endif
	return err;
	}

	CHIP_ERROR SilabsDeviceDataProvider::GetVendorId(uint16_t & vendorId)
	{
	ChipError err = CHIP_NO_ERROR;
	uint32_t vendorId32 = 0;

	err = SilabsConfig::ReadConfigValue(SilabsConfig::kConfigKey_VendorId, vendorId32);

	#if defined(CHIP_DEVICE_CONFIG_DEVICE_VENDOR_ID) && CHIP_DEVICE_CONFIG_DEVICE_VENDOR_ID
	if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
	{
	vendorId32 = CHIP_DEVICE_CONFIG_DEVICE_VENDOR_ID;
	err = CHIP_NO_ERROR;
	}
	#endif // defined(CHIP_DEVICE_CONFIG_DEVICE_VENDOR_ID) && CHIP_DEVICE_CONFIG_DEVICE_VENDOR_ID

	ReturnErrorOnFailure(err);
	vendorId = static_cast<uint16_t>(vendorId32);
	return err;
	}

	CHIP_ERROR SilabsDeviceDataProvider::GetProductName(char * buf, size_t bufSize)
	{
	size_t productNameLen = 0; // without counting null-terminator
	CHIP_ERROR err = SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_ProductName, buf, bufSize, productNameLen);
	#if defined(CHIP_DEVICE_CONFIG_TEST_PRODUCT_NAME)
	if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
	{
	VerifyOrReturnError(buf != nullptr, CHIP_ERROR_NO_MEMORY);
	VerifyOrReturnError(bufSize > strlen(CHIP_DEVICE_CONFIG_TEST_VENDOR_NAME), CHIP_ERROR_BUFFER_TOO_SMALL);
	Platform::CopyString(buf, bufSize, CHIP_DEVICE_CONFIG_TEST_PRODUCT_NAME);
	err = CHIP_NO_ERROR;
	}
	#endif
	return err;
	}

	CHIP_ERROR SilabsDeviceDataProvider::GetProductId(uint16_t & productId)
	{
	ChipError err = CHIP_NO_ERROR;
	uint32_t productId32 = 0;

	err = SilabsConfig::ReadConfigValue(SilabsConfig::kConfigKey_ProductId, productId32);

	#if defined(CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_ID) && CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_ID
	if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
	{
	productId32 = CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_ID;
	err = CHIP_NO_ERROR;
	}
	#endif // defined(CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_ID) && CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_ID
	ReturnErrorOnFailure(err);

	productId = static_cast<uint16_t>(productId32);
	return err;
	}

	CHIP_ERROR SilabsDeviceDataProvider::GetHardwareVersionString(char * buf, size_t bufSize)
	{
	size_t hardwareVersionStringLen = 0; // without counting null-terminator
	CHIP_ERROR err =
	SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_HardwareVersionString, buf, bufSize, hardwareVersionStringLen);
	#if defined(CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION_STRING)
	if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
	{
	VerifyOrReturnError(buf != nullptr, CHIP_ERROR_NO_MEMORY);
	VerifyOrReturnError(bufSize > strlen(CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION_STRING),
	CHIP_ERROR_BUFFER_TOO_SMALL);
	Platform::CopyString(buf, bufSize, CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION_STRING);
	err = CHIP_NO_ERROR;
	}
	#endif // CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION_STRING
	return err;
	}

	CHIP_ERROR SilabsDeviceDataProvider::GetHardwareVersion(uint16_t & hardwareVersion)
	{
	CHIP_ERROR err;
	uint32_t hardwareVersion32;

	err = SilabsConfig::ReadConfigValue(SilabsConfig::kConfigKey_HardwareVersion, hardwareVersion32);
	#if defined(CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION)
	if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
	{
	hardwareVersion32 = CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION;
	err = CHIP_NO_ERROR;
	}
	#endif // defined(CHIP_DEVICE_CONFIG_DEFAULT_DEVICE_HARDWARE_VERSION)

	hardwareVersion = static_cast<uint16_t>(hardwareVersion32);
	return err;
	}

	CHIP_ERROR SilabsDeviceDataProvider::GetRotatingDeviceIdUniqueId(MutableByteSpan & uniqueIdSpan)
	{
	ChipError err = CHIP_ERROR_WRONG_KEY_TYPE;
	#if CHIP_ENABLE_ROTATING_DEVICE_ID
	static_assert(ConfigurationManager::kRotatingDeviceIDUniqueIDLength >= ConfigurationManager::kMinRotatingDeviceIDUniqueIDLength,
	"Length of unique ID for rotating device ID is smaller than minimum.");

	size_t uniqueIdLen = 0;
	err =
	SilabsConfig::ReadConfigValueBin(SilabsConfig::kConfigKey_UniqueId, uniqueIdSpan.data(), uniqueIdSpan.size(), uniqueIdLen);
	#ifdef CHIP_DEVICE_CONFIG_ROTATING_DEVICE_ID_UNIQUE_ID
	if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
	{
	constexpr uint8_t uniqueId[] = CHIP_DEVICE_CONFIG_ROTATING_DEVICE_ID_UNIQUE_ID;

	ReturnErrorCodeIf(sizeof(uniqueId) > uniqueIdSpan.size(), CHIP_ERROR_BUFFER_TOO_SMALL);
	memcpy(uniqueIdSpan.data(), uniqueId, sizeof(uniqueId));
	uniqueIdLen = sizeof(uniqueId);
	}
	#endif // CHIP_DEVICE_CONFIG_ROTATING_DEVICE_ID_UNIQUE_ID

	ReturnErrorOnFailure(err);
	uniqueIdSpan.reduce_size(uniqueIdLen);

	#endif // CHIP_ENABLE_ROTATING_DEVICE_ID
	return err;
	}

	CHIP_ERROR SilabsDeviceDataProvider::GetSerialNumber(char * buf, size_t bufSize)
	{
	size_t serialNumberLen = 0; // without counting null-terminator
	return SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_SerialNum, buf, bufSize, serialNumberLen);
	}

	CHIP_ERROR SilabsDeviceDataProvider::GetManufacturingDate(uint16_t & year, uint8_t & month, uint8_t & day)
	{
	CHIP_ERROR err;
	constexpr uint8_t kDateStringLength = 10; // YYYY-MM-DD
	char dateStr[kDateStringLength + 1];
	size_t dateLen;
	char * parseEnd;

	err = SilabsConfig::ReadConfigValueBin(SilabsConfig::kConfigKey_ManufacturingDate, reinterpret_cast<uint8_t *>(dateStr),
	sizeof(dateStr), dateLen);
	SuccessOrExit(err);

	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(dateStr, &parseEnd, 10));
	VerifyOrExit(parseEnd == dateStr + 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(dateStr + 5, &parseEnd, 10));
	VerifyOrExit(parseEnd == dateStr + 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(dateStr + 8, &parseEnd, 10));
	VerifyOrExit(parseEnd == dateStr + 10, err = CHIP_ERROR_INVALID_ARGUMENT);

	exit:
	if (err != CHIP_NO_ERROR && err != CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
	{
	ChipLogError(DeviceLayer, "Invalid manufacturing date: %s", dateStr);
	}
	return err;
	}

	CHIP_ERROR SilabsDeviceDataProvider::GetPartNumber(char * buf, size_t bufSize)
	{
	size_t partNumberLen = 0; // without counting null-terminator
	return SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_PartNumber, buf, bufSize, partNumberLen);
	}

	CHIP_ERROR SilabsDeviceDataProvider::GetProductURL(char * buf, size_t bufSize)
	{
	size_t productUrlLen = 0; // without counting null-terminator
	return SilabsConfig::ReadConfigValueStr(SilabsConfig::kConfigKey_ProductURL, buf, bufSize, productUrlLen);
	}

	CHIP_ERROR SilabsDeviceDataProvider::GetProductLabel(char * buf, size_t bufSize)
	{
	size_t productLabelLen = 0; // without counting null-terminator
	return SilabsConfig::ReadConfigValueStr(SilabsConfig::KConfigKey_ProductLabel, buf, bufSize, productLabelLen);
	}

	SilabsDeviceDataProvider & SilabsDeviceDataProvider::GetDeviceDataProvider()
	{
	static SilabsDeviceDataProvider sDataProvider;
	return sDataProvider;
	}

	} // namespace Silabs
	} // namespace DeviceLayer
	} // namespace chip