Guard crypto parts in "Update" to save resources (espressif#10630)

* guard crypt update * guard update crypt * Update Updater.cpp * revert logic to disable * change disable logic * formatting * formatting * remove trailing space

Author: Jason2866

libraries/Update/src/Update.h

@@ -63,6 +63,7 @@ class UpdateClass {
  */
  bool begin(size_t size = UPDATE_SIZE_UNKNOWN, int command = U_FLASH, int ledPin = -1, uint8_t ledOn = LOW, const char *label = NULL);
 
+#ifndef UPDATE_NOCRYPT
  /*
  Setup decryption configuration
  Crypt Key is 32bytes(256bits) block of data, use the same key as used to encrypt image file
@@ -71,6 +72,7 @@ class UpdateClass {
  Crypt Mode, used to select if image files should be decrypted or not
  */
  bool setupCrypt(const uint8_t *cryptKey = 0, size_t cryptAddress = 0, uint8_t cryptConfig = 0xf, int cryptMode = U_AES_DECRYPT_AUTO);
+#endif /* UPDATE_NOCRYPT */
 
  /*
  Writes a buffer to the flash and increments the address
@@ -99,6 +101,7 @@ class UpdateClass {
  */
  bool end(bool evenIfRemaining = false);
 
+#ifndef UPDATE_NOCRYPT
  /*
  sets AES256 key(32 bytes) used for decrypting image file
  */
@@ -122,6 +125,7 @@ class UpdateClass {
  void setCryptConfig(const uint8_t cryptConfig) {
  _cryptCfg = cryptConfig & 0x0f;
  }
+#endif /* UPDATE_NOCRYPT */
 
  /*
  Aborts the running update
@@ -139,7 +143,13 @@ class UpdateClass {
  sets the expected MD5 for the firmware (hexString)
  If calc_post_decryption is true, the update library will calculate the MD5 after the decryption, if false the calculation occurs before the decryption
  */
- bool setMD5(const char *expected_md5, bool calc_post_decryption = true);
+ bool setMD5(
+ const char *expected_md5
+#ifndef UPDATE_NOCRYPT
+ ,
+ bool calc_post_decryption = true
+#endif /* #ifdef UPDATE_NOCRYPT */
+ );
 
  /*
  returns the MD5 String of the successfully ended firmware
@@ -236,17 +246,21 @@ class UpdateClass {
 private:
  void _reset();
  void _abort(uint8_t err);
+#ifndef UPDATE_NOCRYPT
  void _cryptKeyTweak(size_t cryptAddress, uint8_t *tweaked_key);
  bool _decryptBuffer();
+#endif /* UPDATE_NOCRYPT */
  bool _writeBuffer();
  bool _verifyHeader(uint8_t data);
  bool _verifyEnd();
  bool _enablePartition(const esp_partition_t *partition);
  bool _chkDataInBlock(const uint8_t *data, size_t len) const; // check if block contains any data or is empty
 
  uint8_t _error;
+#ifndef UPDATE_NOCRYPT
  uint8_t *_cryptKey;
  uint8_t *_cryptBuffer;
+#endif /* UPDATE_NOCRYPT */
  uint8_t *_buffer;
  uint8_t *_skipBuffer;
  size_t _bufferLen;
@@ -258,15 +272,19 @@ class UpdateClass {
  const esp_partition_t *_partition;
 
  String _target_md5;
+#ifndef UPDATE_NOCRYPT
  bool _target_md5_decrypted = true;
+#endif /* UPDATE_NOCRYPT */
  MD5Builder _md5;
 
  int _ledPin;
  uint8_t _ledOn;
 
+#ifndef UPDATE_NOCRYPT
  uint8_t _cryptMode;
  size_t _cryptAddress;
  uint8_t _cryptCfg;
+#endif /* UPDATE_NOCRYPT */
 };
 
 #if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_UPDATE)

libraries/Update/src/Updater.cpp

@@ -9,7 +9,9 @@
 #include "spi_flash_mmap.h"
 #include "esp_ota_ops.h"
 #include "esp_image_format.h"
+#ifndef UPDATE_NOCRYPT
 #include "mbedtls/aes.h"
+#endif /* UPDATE_NOCRYPT */
 
 static const char *_err2str(uint8_t _error) {
  if (_error == UPDATE_ERROR_OK) {
@@ -38,8 +40,10 @@ static const char *_err2str(uint8_t _error) {
  return ("Bad Argument");
  } else if (_error == UPDATE_ERROR_ABORT) {
  return ("Aborted");
+#ifndef UPDATE_NOCRYPT
  } else if (_error == UPDATE_ERROR_DECRYPT) {
  return ("Decryption error");
+#endif /* UPDATE_NOCRYPT */
  }
  return ("UNKNOWN");
 }
@@ -67,8 +71,17 @@ bool UpdateClass::_enablePartition(const esp_partition_t *partition) {
 }
 
 UpdateClass::UpdateClass()
- : _error(0), _cryptKey(0), _cryptBuffer(0), _buffer(0), _skipBuffer(0), _bufferLen(0), _size(0), _progress_callback(NULL), _progress(0), _paroffset(0),
- _command(U_FLASH), _partition(NULL), _cryptMode(U_AES_DECRYPT_AUTO), _cryptAddress(0), _cryptCfg(0xf) {}
+ : _error(0),
+#ifndef UPDATE_NOCRYPT
+ _cryptKey(0), _cryptBuffer(0),
+#endif /* UPDATE_NOCRYPT */
+ _buffer(0), _skipBuffer(0), _bufferLen(0), _size(0), _progress_callback(NULL), _progress(0), _paroffset(0), _command(U_FLASH), _partition(NULL)
+#ifndef UPDATE_NOCRYPT
+ ,
+ _cryptMode(U_AES_DECRYPT_AUTO), _cryptAddress(0), _cryptCfg(0xf)
+#endif /* UPDATE_NOCRYPT */
+{
+}
 
 UpdateClass &UpdateClass::onProgress(THandlerFunction_Progress fn) {
  _progress_callback = fn;
@@ -83,7 +96,9 @@ void UpdateClass::_reset() {
  delete[] _skipBuffer;
  }
 
+#ifndef UPDATE_NOCRYPT
  _cryptBuffer = nullptr;
+#endif /* UPDATE_NOCRYPT */
  _buffer = nullptr;
  _skipBuffer = nullptr;
  _bufferLen = 0;
@@ -175,6 +190,7 @@ bool UpdateClass::begin(size_t size, int command, int ledPin, uint8_t ledOn, con
  return true;
 }
 
+#ifndef UPDATE_NOCRYPT
 bool UpdateClass::setupCrypt(const uint8_t *cryptKey, size_t cryptAddress, uint8_t cryptConfig, int cryptMode) {
  if (setCryptKey(cryptKey)) {
  if (setCryptMode(cryptMode)) {
@@ -216,6 +232,7 @@ bool UpdateClass::setCryptMode(const int cryptMode) {
  }
  return true;
 }
+#endif /* UPDATE_NOCRYPT */
 
 void UpdateClass::_abort(uint8_t err) {
  _reset();
@@ -226,6 +243,7 @@ void UpdateClass::abort() {
  _abort(UPDATE_ERROR_ABORT);
 }
 
+#ifndef UPDATE_NOCRYPT
 void UpdateClass::_cryptKeyTweak(size_t cryptAddress, uint8_t *tweaked_key) {
  memcpy(tweaked_key, _cryptKey, ENCRYPTED_KEY_SIZE);
  if (_cryptCfg == 0) {
@@ -338,8 +356,10 @@ bool UpdateClass::_decryptBuffer() {
  }
  return true;
 }
+#endif /* UPDATE_NOCRYPT */
 
 bool UpdateClass::_writeBuffer() {
+#ifndef UPDATE_NOCRYPT
  //first bytes of loading image, check to see if loading image needs decrypting
  if (!_progress) {
  _cryptMode &= U_AES_DECRYPT_MODE_MASK;
@@ -360,6 +380,7 @@ bool UpdateClass::_writeBuffer() {
  return false;
  }
  }
+#endif /* UPDATE_NOCRYPT */
  //first bytes of new firmware
  uint8_t skip = 0;
  if (!_progress && _command == U_FLASH) {
@@ -409,9 +430,13 @@ bool UpdateClass::_writeBuffer() {
  if (!_progress && _command == U_FLASH) {
  _buffer[0] = ESP_IMAGE_HEADER_MAGIC;
  }
+#ifndef UPDATE_NOCRYPT
  if (_target_md5_decrypted) {
+#endif /* UPDATE_NOCRYPT */
  _md5.add(_buffer, _bufferLen);
+#ifndef UPDATE_NOCRYPT
  }
+#endif /* UPDATE_NOCRYPT */
  _progress += _bufferLen;
  _bufferLen = 0;
  if (_progress_callback) {
@@ -453,13 +478,21 @@ bool UpdateClass::_verifyEnd() {
  return false;
 }
 
-bool UpdateClass::setMD5(const char *expected_md5, bool calc_post_decryption) {
+bool UpdateClass::setMD5(
+ const char *expected_md5
+#ifndef UPDATE_NOCRYPT
+ ,
+ bool calc_post_decryption
+#endif /* UPDATE_NOCRYPT */
+) {
  if (strlen(expected_md5) != 32) {
  return false;
  }
  _target_md5 = expected_md5;
  _target_md5.toLowerCase();
+#ifndef UPDATE_NOCRYPT
  _target_md5_decrypted = calc_post_decryption;
+#endif /* UPDATE_NOCRYPT */
  return true;
 }
 
@@ -532,12 +565,16 @@ size_t UpdateClass::writeStream(Stream &data) {
  return 0;
  }
 
+#ifndef UPDATE_NOCRYPT
  if (_command == U_FLASH && !_cryptMode) {
+#endif /* UPDATE_NOCRYPT */
  if (!_verifyHeader(data.peek())) {
  _reset();
  return 0;
  }
+#ifndef UPDATE_NOCRYPT
  }
+#endif /* UPDATE_NOCRYPT */
 
  if (_ledPin != -1) {
  pinMode(_ledPin, OUTPUT);