| /* |
| * |
| * Copyright (c) 2023 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. |
| */ |
| #pragma once |
| |
| #include <crypto/CHIPCryptoPAL.h> |
| #include <platform/nxp/k32w/common/FactoryDataProvider.h> |
| |
| #if !CHIP_USE_PLAIN_DAC_KEY |
| #include "sss_crypto.h" |
| #endif |
| |
| /* This flag should be defined to run SSS_RunApiTest tests. |
| */ |
| #ifndef CHIP_DEVICE_CONFIG_ENABLE_SSS_API_TEST |
| #define CHIP_DEVICE_CONFIG_ENABLE_SSS_API_TEST 0 |
| #endif |
| |
| namespace chip { |
| namespace DeviceLayer { |
| |
| /** |
| * This class extends the default FactoryDataProvider functionality |
| * by leveraging the secure subsystem for signing messages. |
| */ |
| |
| class FactoryDataProviderImpl : public FactoryDataProvider |
| { |
| public: |
| ~FactoryDataProviderImpl(); |
| |
| CHIP_ERROR Init() override; |
| CHIP_ERROR SignWithDacKey(const ByteSpan & messageToSign, MutableByteSpan & outSignBuffer) override; |
| |
| private: |
| #if !CHIP_USE_PLAIN_DAC_KEY |
| |
| CHIP_ERROR SSS_InitContext(); |
| CHIP_ERROR SSS_ImportPrivateKeyBlob(); |
| CHIP_ERROR SSS_Sign(uint8_t * digest, Crypto::P256ECDSASignature & signature); |
| /*! |
| * \brief Convert DAC private key to an SSS encrypted blob and update factory data if not already done |
| * |
| * @note This API should be called in manufacturing process context to replace |
| * DAC private key with an SSS encrypted blob. The conversion will be a |
| * one-time-only operation. |
| * @retval #CHIP_NO_ERROR if factory data was updated successfully. |
| */ |
| CHIP_ERROR SSS_ConvertDacKey(); |
| |
| /*! |
| * \brief Check and export an SSS encrypted blob from the DAC private key found in factory data if needed |
| * |
| * @param data Pointer to an allocated buffer |
| * @param dataLen Pointer to a variable that will store the blob length |
| * @param offset Offset of private key from the start of factory data payload address (after header) |
| * @param isNeeded Will be set to true if conversion is needed |
| * |
| * @retval #CHIP_NO_ERROR if conversion to blob was successful. |
| */ |
| CHIP_ERROR SSS_ExportBlob(uint8_t * data, size_t * dataLen, uint32_t & offset, bool & isNeeded); |
| |
| /*! |
| * \brief Replace DAC private key with the specified SSS encrypted blob |
| * |
| * @note A new hash has to be computed and written in the factory data header. |
| * @param data Pointer to a RAM buffer that duplicates the current factory data |
| * @param blob Pointer to blob data |
| * @param blobLen Blob length |
| * @param offset Offset of private key from the start of factory data payload address (after header) |
| * Extracted with SSS_ConvertToBlob. |
| * |
| * @retval #CHIP_NO_ERROR if conversion to blob was successful. |
| */ |
| CHIP_ERROR ReplaceWithBlob(uint8_t * data, uint8_t * blob, size_t blobLen, uint32_t offset); |
| |
| #if CHIP_DEVICE_CONFIG_ENABLE_SSS_API_TEST |
| void SSS_RunApiTest(); |
| #endif |
| |
| sss_sscp_object_t mContext; |
| #endif // CHIP_USE_PLAIN_DAC_KEY |
| }; |
| |
| } // namespace DeviceLayer |
| } // namespace chip |