Fix encrypted large file upload

b2sdk/transfer/emerge/executor.py

@@ -395,7 +395,6 @@ def __init__(
         large_file_id,
         large_file_upload_state,
         finished_parts=None,
-        destination_encryption: Optional[EncryptionSetting] = None,
     ):
         super(LargeFileEmergeExecutionStepFactory, self).__init__(emerge_execution, emerge_part)
         self.part_number = part_number
@@ -421,7 +420,7 @@ def create_upload_execution_step(self, stream_opener, stream_length=None, stream
             self.large_file_upload_state,
             stream_length=stream_length,
             stream_sha1=stream_sha1,
-            finished_parts=self.finished_parts
+            finished_parts=self.finished_parts,
         )
 
 

b2sdk/transfer/outbound/copy_manager.py

@@ -131,6 +131,10 @@ def _copy_part(
             EncryptionMode.SSE_B2,
         )
 
+        # b2_copy_part doesn't need SSE-B2. Large file encryption is decided on b2_start_large_file.
+        if destination_encryption is not None and destination_encryption.mode == EncryptionMode.SSE_B2:
+            destination_encryption = None
+
         # Check if this part was uploaded before
         if finished_parts is not None and part_number in finished_parts:
             # Report this part finished

b2sdk/transfer/outbound/upload_manager.py

@@ -137,6 +137,11 @@ def _upload_part(
         :param b2sdk.v1.EncryptionSetting encryption: encryption setting (``None`` if unknown)
         """
         assert encryption is None or encryption.mode in (EncryptionMode.SSE_B2,)
+
+        # b2_upload_part doesn't need SSE-B2. Large file encryption is decided on b2_start_large_file.
+        if encryption is not None and encryption.mode == EncryptionMode.SSE_B2:
+            encryption = None
+
         # Check if this part was uploaded before
         if finished_parts is not None and part_number in finished_parts:
             # Report this part finished