From 2324289ed7d81ffa998eff6da4d0863c7e473253 Mon Sep 17 00:00:00 2001
From: Shubham Patil <shubham.patil@espressif.com>
Date: Tue, 5 Jul 2022 18:02:24 +0530
Subject: [PATCH] [ESP32] Read unique-id from factory partition (#20249)

---
 src/platform/ESP32/ESP32Config.cpp              |  2 +-
 src/platform/ESP32/ESP32FactoryDataProvider.cpp | 15 +++++++++++++++
 src/platform/ESP32/ESP32FactoryDataProvider.h   |  1 +
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/platform/ESP32/ESP32Config.cpp b/src/platform/ESP32/ESP32Config.cpp
index 2097f918764b9d..b839f4ad3d70e0 100644
--- a/src/platform/ESP32/ESP32Config.cpp
+++ b/src/platform/ESP32/ESP32Config.cpp
@@ -72,6 +72,7 @@ const ESP32Config::Key ESP32Config::kConfigKey_VendorId              = { kConfig
 const ESP32Config::Key ESP32Config::kConfigKey_VendorName            = { kConfigNamespace_ChipFactory, "vendor-name" };
 const ESP32Config::Key ESP32Config::kConfigKey_ProductId             = { kConfigNamespace_ChipFactory, "product-id" };
 const ESP32Config::Key ESP32Config::kConfigKey_ProductName           = { kConfigNamespace_ChipFactory, "product-name" };
+const ESP32Config::Key ESP32Config::kConfigKey_UniqueId              = { kConfigNamespace_ChipFactory, "unique-id" };
 
 // Keys stored in the chip-config namespace
 const ESP32Config::Key ESP32Config::kConfigKey_ServiceConfig      = { kConfigNamespace_ChipConfig, "service-config" };
@@ -82,7 +83,6 @@ const ESP32Config::Key ESP32Config::kConfigKey_FailSafeArmed      = { kConfigNam
 const ESP32Config::Key ESP32Config::kConfigKey_WiFiStationSecType = { kConfigNamespace_ChipConfig, "sta-sec-type" };
 const ESP32Config::Key ESP32Config::kConfigKey_RegulatoryLocation = { kConfigNamespace_ChipConfig, "reg-location" };
 const ESP32Config::Key ESP32Config::kConfigKey_CountryCode        = { kConfigNamespace_ChipConfig, "country-code" };
-const ESP32Config::Key ESP32Config::kConfigKey_UniqueId           = { kConfigNamespace_ChipFactory, "unique-id" };
 
 // Keys stored in the Chip-counters namespace
 const ESP32Config::Key ESP32Config::kCounterKey_RebootCount           = { kConfigNamespace_ChipCounters, "reboot-count" };
diff --git a/src/platform/ESP32/ESP32FactoryDataProvider.cpp b/src/platform/ESP32/ESP32FactoryDataProvider.cpp
index adeb155e4d382b..443374b2c4421b 100644
--- a/src/platform/ESP32/ESP32FactoryDataProvider.cpp
+++ b/src/platform/ESP32/ESP32FactoryDataProvider.cpp
@@ -194,6 +194,21 @@ CHIP_ERROR ESP32FactoryDataProvider::GetHardwareVersionString(char * buf, size_t
     size_t hardwareVersionStringLen = 0; // without counting null-terminator
     return ESP32Config::ReadConfigValueStr(ESP32Config::kConfigKey_HardwareVersionString, buf, bufSize, hardwareVersionStringLen);
 }
+
+CHIP_ERROR ESP32FactoryDataProvider::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.");
+
+    size_t uniqueIdLen = 0;
+    err = ESP32Config::ReadConfigValueBin(ESP32Config::kConfigKey_UniqueId, uniqueIdSpan.data(), uniqueIdSpan.size(), uniqueIdLen);
+    ReturnErrorOnFailure(err);
+    uniqueIdSpan.reduce_size(uniqueIdLen);
+#endif
+    return err;
+}
 #endif // CHIP_DEVICE_CONFIG_ENABLE_DEVICE_INSTANCE_INFO_PROVIDER
 
 } // namespace DeviceLayer
diff --git a/src/platform/ESP32/ESP32FactoryDataProvider.h b/src/platform/ESP32/ESP32FactoryDataProvider.h
index aa258d1d3df91f..92b8d3042ec537 100644
--- a/src/platform/ESP32/ESP32FactoryDataProvider.h
+++ b/src/platform/ESP32/ESP32FactoryDataProvider.h
@@ -67,6 +67,7 @@ class ESP32FactoryDataProvider : public CommissionableDataProvider,
     CHIP_ERROR GetProductName(char * buf, size_t bufSize) override;
     CHIP_ERROR GetProductId(uint16_t & productId) override;
     CHIP_ERROR GetHardwareVersionString(char * buf, size_t bufSize) override;
+    CHIP_ERROR GetRotatingDeviceIdUniqueId(MutableByteSpan & uniqueIdSpan) override;
 #endif // CHIP_DEVICE_CONFIG_ENABLE_DEVICE_INSTANCE_INFO_PROVIDER
 };