Compute sketch SHA256

Author: pennam

src/ArduinoIoTCloudTCP.cpp

@@ -215,8 +215,44 @@ int ArduinoIoTCloudTCP::begin(bool const enable_watchdog, String brokerAddress,
    */
   String const sha256_str = FlashSHA256::calc(XIP_BASE, 0x100000);
 #elif defined(ARDUINO_ARCH_ESP32)
-# warning "Compute image SHA256"
-String const sha256_str;
+  SHA256         sha256;
+
+  uint32_t lengthLeft = ESP.getSketchSize();
+
+  const esp_partition_t *running = esp_ota_get_running_partition();
+  if (!running) {
+    DEBUG_ERROR("Partition could not be found");
+  }
+  const size_t bufSize = SPI_FLASH_SEC_SIZE;
+  std::unique_ptr<uint8_t[]> buf(new uint8_t[bufSize]);
+  uint32_t offset = 0;
+  if(!buf.get()) {
+    DEBUG_ERROR("Not enough memory to allocate buffer");
+  }
+
+  sha256.begin();
+  while( lengthLeft > 0) {
+    size_t readBytes = (lengthLeft < bufSize) ? lengthLeft : bufSize;
+    if (!ESP.flashRead(running->address + offset, reinterpret_cast<uint32_t*>(buf.get()), (readBytes + 3) & ~3)) {
+      DEBUG_ERROR("Could not read buffer from flash");
+    }
+    sha256.update(buf.get(), readBytes);
+    lengthLeft -= readBytes;
+    offset += readBytes;
+  }
+  /* Retrieve the final hash string. */
+  uint8_t sha256_hash[SHA256::HASH_SIZE] = {0};
+  sha256.finalize(sha256_hash);
+  String sha256_str;
+  std::for_each(sha256_hash,
+                sha256_hash + SHA256::HASH_SIZE,
+                [&sha256_str](uint8_t const elem)
+                {
+                  char buf[4];
+                  snprintf(buf, 4, "%02X", elem);
+                  sha256_str += buf;
+                });
+  DEBUG_VERBOSE("SHA256: %d bytes (of %d) read", ESP.getSketchSize() - lengthLeft, ESP.getSketchSize());
 #else
 # error "No method for SHA256 checksum calculation over application image defined for this architecture."
 #endif

src/tls/bearssl/dec32be.c

@@ -23,7 +23,7 @@
  */
 
 #include <AIoTC_Config.h>
-#if defined(BOARD_HAS_ECCX08) || defined(BOARD_HAS_OFFLOADED_ECCX08) || defined(BOARD_HAS_SE050)
+#if defined(BOARD_HAS_ECCX08) || defined(BOARD_HAS_OFFLOADED_ECCX08) || defined(BOARD_HAS_SE050) || defined(ARDUINO_ARCH_ESP32)
 
 #include "inner.h"
 

src/tls/bearssl/enc32be.c

@@ -23,7 +23,7 @@
  */
 
 #include <AIoTC_Config.h>
-#if defined(BOARD_HAS_ECCX08) || defined(BOARD_HAS_OFFLOADED_ECCX08) || defined(BOARD_HAS_SE050)
+#if defined(BOARD_HAS_ECCX08) || defined(BOARD_HAS_OFFLOADED_ECCX08) || defined(BOARD_HAS_SE050) || defined(ARDUINO_ARCH_ESP32)
 
 #include "inner.h"
 

src/tls/bearssl/sha2small.c

@@ -23,7 +23,7 @@
  */
 
 #include <AIoTC_Config.h>
-#if defined(BOARD_HAS_ECCX08) || defined(BOARD_HAS_OFFLOADED_ECCX08) || defined(BOARD_HAS_SE050)
+#if defined(BOARD_HAS_ECCX08) || defined(BOARD_HAS_OFFLOADED_ECCX08) || defined(BOARD_HAS_SE050) || defined(ARDUINO_ARCH_ESP32)
 
 #include "inner.h"