nice version

app/core/crypto/aes_siv_stream.py

@@ -4,7 +4,6 @@ import os
 import struct
 from typing import BinaryIO, Iterator, AsyncIterator
 
-from Crypto.Cipher import SIV
 from Crypto.Cipher import AES
 
 
@@ -62,7 +61,7 @@ def encrypt_file_to_encf(src: BinaryIO, key: bytes, chunk_bytes: int, salt: byte
         block = src.read(chunk_bytes)
         if not block:
             break
-        siv = SIV.new(key=key, ciphermod=AES)  # new object per message
+        siv = AES.new(key, AES.MODE_SIV)  # new object per message
         siv.update(_ad(salt, idx))
         ciph, tag = siv.encrypt_and_digest(block)
         yield struct.pack(">I", len(block))
@@ -76,7 +75,6 @@ async def decrypt_encf_to_file(byte_iter: AsyncIterator[bytes], key: bytes, out_
     Parse ENCF v1 stream from async byte iterator and write plaintext to out_path.
     """
     import aiofiles
-    from Crypto.Cipher import SIV as _SIV
     from Crypto.Cipher import AES as _AES
 
     buf = bytearray()
@@ -129,7 +127,7 @@ async def decrypt_encf_to_file(byte_iter: AsyncIterator[bytes], key: bytes, out_
             c = bytes(buf[:p_len])
             t = bytes(buf[p_len:p_len+TAG_LEN])
             del buf[:p_len+TAG_LEN]
-            siv = _SIV.new(key=key, ciphermod=_AES)
+            siv = _AES.new(key, _AES.MODE_SIV)
             siv.update(_ad(salt, idx))
             p = siv.decrypt_and_verify(c, t)
             await out.write(p)