/*
 *
 *    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 <crypto/CHIPCryptoPAL.h>
#include <lib/support/Base64.h>
#include <platform/ASR/ASRConfig.h>
#include <platform/ASR/ASRFactoryDataProvider.h>
#include <platform/CHIPDeviceConfig.h>
#include <platform/CHIPDeviceError.h>

namespace chip {
namespace DeviceLayer {

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

namespace {
static constexpr uint32_t kDACPrivateKeySize = 32;
static constexpr uint32_t kDACPublicKeySize  = 65;

CHIP_ERROR LoadKeypairFromRaw(ByteSpan privateKey, ByteSpan publicKey, Crypto::P256Keypair & keypair)
{
    Crypto::P256SerializedKeypair serializedKeypair;
    ReturnErrorOnFailure(serializedKeypair.SetLength(privateKey.size() + publicKey.size()));
    memcpy(serializedKeypair.Bytes(), publicKey.data(), publicKey.size());
    memcpy(serializedKeypair.Bytes() + publicKey.size(), privateKey.data(), privateKey.size());
    return keypair.Deserialize(serializedKeypair);
}
} // namespace

CHIP_ERROR ASRFactoryDataProvider::Init()
{
    CHIP_ERROR err = CHIP_NO_ERROR;
#if CONFIG_ENABLE_ASR_FACTORY_DATA_PROVIDER
    uint8_t ret = asr_factory_check();
    if (ret != 0)
    {
        err = CHIP_ERROR_INTERNAL;
        ChipLogError(DeviceLayer, "The hash of factory bin is not correct.");
    }
#endif
    return err;
}

CHIP_ERROR ASRFactoryDataProvider::GetSetupDiscriminator(uint16_t & setupDiscriminator)
{
    uint32_t setupDiscriminator32;
#if !CONFIG_ENABLE_ASR_FACTORY_DATA_PROVIDER
#if defined(CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR) && CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR
    setupDiscriminator32 = CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR;
#else
    return CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;
#endif // defined(CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR) && CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR
#else
    ReturnErrorOnFailure(ASRConfig::ReadFactoryConfigValue(ASR_DISCRIMINATOR_PARTITION, setupDiscriminator32));
#endif
    VerifyOrReturnLogError(setupDiscriminator32 <= kMaxDiscriminatorValue, CHIP_ERROR_INVALID_ARGUMENT);
    setupDiscriminator = static_cast<uint16_t>(setupDiscriminator32);
    return CHIP_NO_ERROR;
}

CHIP_ERROR ASRFactoryDataProvider::GetSpake2pIterationCount(uint32_t & iterationCount)
{
#if !CONFIG_ENABLE_ASR_FACTORY_DATA_PROVIDER
#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;
    return CHIP_NO_ERROR;
#else
    return CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;
#endif // defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_ITERATION_COUNT) && CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_ITERATION_COUNT
#else
    return ASRConfig::ReadFactoryConfigValue(ASR_ITERATION_COUNT_PARTITION, iterationCount);
#endif
}

CHIP_ERROR ASRFactoryDataProvider::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;
#if !CONFIG_ENABLE_ASR_FACTORY_DATA_PROVIDER
#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);
#else
    return CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;
#endif // defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_SALT)
#else
    err = ASRConfig::ReadFactoryConfigValue(ASR_SALT_PARTITION, reinterpret_cast<uint8_t *>(saltB64), kSpake2pSalt_MaxBase64Len,
                                            saltB64Len);
#endif
    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 ASRFactoryDataProvider::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;
#if !CONFIG_ENABLE_ASR_FACTORY_DATA_PROVIDER
#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);
#else
    return CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;
#endif // defined(CHIP_DEVICE_CONFIG_USE_TEST_SPAKE2P_VERIFIER)
#else
    err = ASRConfig::ReadFactoryConfigValue(ASR_VERIFIER_PARTITION, reinterpret_cast<uint8_t *>(verifierB64),
                                            kSpake2pSerializedVerifier_MaxBase64Len, verifierB64Len);
#endif
    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;
}

#define USE_EXAMPLES_DAC // VID:0xFFF1  PID:0x8001

#if CONFIG_ENABLE_ASR_FACTORY_DATA_PROVIDER
#undef USE_EXAMPLES_DAC
#endif

CHIP_ERROR ASRFactoryDataProvider::GetCertificationDeclaration(MutableByteSpan & outBuffer)
{
#if !CONFIG_ENABLE_ASR_FACTORY_DATA_PROVIDER
#ifdef USE_EXAMPLES_DAC
    //-> format_version = 1
    //-> vendor_id = 0xFFF1
    //-> product_id_array = [ 0x8000, 0x8001, 0x8002, 0x8003, 0x8004, 0x8005, 0x8006, 0x8007, 0x8008, 0x8009, 0x800A, 0x800B,
    // 0x800C, 0x800D, 0x800E, 0x800F, 0x8010, 0x8011, 0x8012, 0x8013, 0x8014, 0x8015, 0x8016, 0x8017, 0x8018, 0x8019, 0x801A,
    // 0x801B, 0x801C, 0x801D, 0x801E, 0x801F, 0x8020, 0x8021, 0x8022, 0x8023, 0x8024, 0x8025, 0x8026, 0x8027, 0x8028, 0x8029,
    // 0x802A, 0x802B, 0x802C, 0x802D, 0x802E, 0x802F, 0x8030, 0x8031, 0x8032, 0x8033, 0x8034, 0x8035, 0x8036, 0x8037, 0x8038,
    // 0x8039, 0x803A, 0x803B, 0x803C, 0x803D, 0x803E, 0x803F, 0x8040, 0x8041, 0x8042, 0x8043, 0x8044, 0x8045, 0x8046, 0x8047,
    // 0x8048, 0x8049, 0x804A, 0x804B, 0x804C, 0x804D, 0x804E, 0x804F, 0x8050, 0x8051, 0x8052, 0x8053, 0x8054, 0x8055, 0x8056,
    // 0x8057, 0x8058, 0x8059, 0x805A, 0x805B, 0x805C, 0x805D, 0x805E, 0x805F, 0x8060, 0x8061, 0x8062, 0x8063 ]
    //-> device_type_id = 0x0016
    //-> certificate_id = "ZIG20142ZB330003-24"
    //-> security_level = 0
    //-> security_information = 0
    //-> version_number = 0x2694
    //-> certification_type = 0
    //-> dac_origin_vendor_id is not present
    //-> dac_origin_product_id is not present
    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,
    };
    return CopySpanToMutableSpan(ByteSpan{ kCdForAllExamples }, outBuffer);
#else
    return CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;
#endif
#else
    size_t certSize;
    ReturnErrorOnFailure(ASRConfig::ReadFactoryConfigValue(ASR_CERT_DCLRN_PARTITION, outBuffer.data(), outBuffer.size(), certSize));
    outBuffer.reduce_size(certSize);
    return CHIP_NO_ERROR;
#endif
}

CHIP_ERROR ASRFactoryDataProvider::GetFirmwareInformation(MutableByteSpan & out_firmware_info_buffer)
{
    // We do not provide any FirmwareInformation.
    out_firmware_info_buffer.reduce_size(0);
    return CHIP_NO_ERROR;
}

CHIP_ERROR ASRFactoryDataProvider::GetDeviceAttestationCert(MutableByteSpan & outBuffer)
{
    size_t certSize;
#if !CONFIG_ENABLE_ASR_FACTORY_DATA_PROVIDER
#ifdef USE_EXAMPLES_DAC
    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,
    };
    return CopySpanToMutableSpan(ByteSpan{ kDacCert }, outBuffer);
#else
    return CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;
#endif
#else
    ReturnErrorOnFailure(ASRConfig::ReadFactoryConfigValue(ASR_DAC_CERT_PARTITION, outBuffer.data(), outBuffer.size(), certSize));
#endif
    outBuffer.reduce_size(certSize);
    return CHIP_NO_ERROR;
}

CHIP_ERROR ASRFactoryDataProvider::GetProductAttestationIntermediateCert(MutableByteSpan & outBuffer)
{
    size_t certSize;
#if !CONFIG_ENABLE_ASR_FACTORY_DATA_PROVIDER
#ifdef USE_EXAMPLES_DAC
    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,
    };
    return CopySpanToMutableSpan(ByteSpan{ kPaiCert }, outBuffer);
#else
    return CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;
#endif
#else
    ReturnErrorOnFailure(ASRConfig::ReadFactoryConfigValue(ASR_PAI_CERT_PARTITION, outBuffer.data(), outBuffer.size(), certSize));
#endif
    outBuffer.reduce_size(certSize);
    return CHIP_NO_ERROR;
}

CHIP_ERROR ASRFactoryDataProvider::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 !CONFIG_ENABLE_ASR_FACTORY_DATA_PROVIDER
#ifdef USE_EXAMPLES_DAC
    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,
    };
    ReturnErrorOnFailure(LoadKeypairFromRaw(ByteSpan{ kDacPrivateKey }, ByteSpan{ kDacPublicKey }, keypair));
#else
    return CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;
#endif
#else
    uint8_t privKeyBuf[kDACPrivateKeySize];
    uint8_t pubKeyBuf[kDACPublicKeySize];
    size_t privKeyLen = sizeof(privKeyBuf);
    size_t pubKeyLen  = sizeof(pubKeyBuf);
    ReturnErrorOnFailure(ASRConfig::ReadFactoryConfigValue(ASR_DAC_KEY_PARTITION, privKeyBuf, privKeyLen, privKeyLen));
    ReturnErrorOnFailure(ASRConfig::ReadFactoryConfigValue(ASR_DAC_PUB_KEY_PARTITION, pubKeyBuf, pubKeyLen, pubKeyLen));
    ReturnErrorOnFailure(LoadKeypairFromRaw(ByteSpan(privKeyBuf, privKeyLen), ByteSpan(pubKeyBuf, pubKeyLen), keypair));
#endif

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

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

CHIP_ERROR ASRFactoryDataProvider::GetVendorName(char * buf, size_t bufSize)
{
#if !CONFIG_ENABLE_ASR_FACTORY_DEVICE_INFO_PROVIDER
    ReturnErrorCodeIf(bufSize < sizeof(CHIP_DEVICE_CONFIG_DEVICE_VENDOR_NAME), CHIP_ERROR_BUFFER_TOO_SMALL);
    strcpy(buf, CHIP_DEVICE_CONFIG_DEVICE_VENDOR_NAME);
#else
#define BUFFER_MAX_SIZE 32
    uint8_t buffer[BUFFER_MAX_SIZE + 1] = { 0 };
    size_t buffer_len                   = BUFFER_MAX_SIZE + 1;
    ReturnErrorOnFailure(ASRConfig::ReadFactoryConfigValue(ASR_VENDOR_NAME_PARTITION, buffer, buffer_len, buffer_len));
    ReturnErrorCodeIf(bufSize < buffer_len, CHIP_ERROR_BUFFER_TOO_SMALL);
    memcpy(buf, buffer, buffer_len);
    buf[buffer_len] = 0;
#endif
    return CHIP_NO_ERROR;
}

CHIP_ERROR ASRFactoryDataProvider::GetVendorId(uint16_t & vendorId)
{
#if !CONFIG_ENABLE_ASR_FACTORY_DEVICE_INFO_PROVIDER
    vendorId = static_cast<uint16_t>(CHIP_DEVICE_CONFIG_DEVICE_VENDOR_ID);
#else
    uint32_t vendorId32;
    ReturnErrorOnFailure(ASRConfig::ReadFactoryConfigValue(ASR_VENDOR_ID_PARTITION, vendorId32));
    vendorId                            = static_cast<uint16_t>(vendorId32);
#endif
    return CHIP_NO_ERROR;
}

CHIP_ERROR ASRFactoryDataProvider::GetProductName(char * buf, size_t bufSize)
{
#if !CONFIG_ENABLE_ASR_FACTORY_DEVICE_INFO_PROVIDER
    ReturnErrorCodeIf(bufSize < sizeof(CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_NAME), CHIP_ERROR_BUFFER_TOO_SMALL);
    strcpy(buf, CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_NAME);
#else
#define BUFFER_MAX_SIZE 32
    uint8_t buffer[BUFFER_MAX_SIZE + 1] = { 0 };
    size_t buffer_len                   = BUFFER_MAX_SIZE + 1;
    ReturnErrorOnFailure(ASRConfig::ReadFactoryConfigValue(ASR_PRODUCT_NAME_PARTITION, buffer, buffer_len, buffer_len));
    ReturnErrorCodeIf(bufSize < buffer_len, CHIP_ERROR_BUFFER_TOO_SMALL);
    memcpy(buf, buffer, buffer_len);
    buf[buffer_len] = 0;
#endif
    return CHIP_NO_ERROR;
}

CHIP_ERROR ASRFactoryDataProvider::GetProductId(uint16_t & productId)
{
#if !CONFIG_ENABLE_ASR_FACTORY_DEVICE_INFO_PROVIDER
    productId = static_cast<uint16_t>(CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_ID);
#else
    uint32_t productId32;
    ReturnErrorOnFailure(ASRConfig::ReadFactoryConfigValue(ASR_PRODUCT_ID_PARTITION, productId32));
    productId = static_cast<uint16_t>(productId32);
#endif
    return CHIP_NO_ERROR;
}

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

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

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

CHIP_ERROR ASRFactoryDataProvider::GetSerialNumber(char * buf, size_t bufSize)
{
    ChipError err = CHIP_NO_ERROR;

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

#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);

    return err;
}

CHIP_ERROR ASRFactoryDataProvider::GetManufacturingDate(uint16_t & year, uint8_t & month, uint8_t & day)
{
    return CHIP_ERROR_NOT_IMPLEMENTED;
}

CHIP_ERROR ASRFactoryDataProvider::GetHardwareVersion(uint16_t & hardwareVersion)
{
    return CHIP_ERROR_NOT_IMPLEMENTED;
}

CHIP_ERROR ASRFactoryDataProvider::GetHardwareVersionString(char * buf, size_t bufSize)
{
    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);
    return CHIP_NO_ERROR;
}

CHIP_ERROR ASRFactoryDataProvider::GetRotatingDeviceIdUniqueId(MutableByteSpan & uniqueIdSpan)
{
    ChipError 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));
    return CHIP_NO_ERROR;
#endif
    return err;
}

} // namespace DeviceLayer
} // namespace chip