[dependencies] Standardize Cryptodome imports

yt_dlp/dependencies/Cryptodome.py

@@ -0,0 +1,38 @@
+import importlib
+
+from ..compat import functools
+from ..compat.compat_utils import EnhancedModule, passthrough_module
+
+EnhancedModule(__name__)
+
+try:
+    import Cryptodome as _parent
+except ImportError:
+    try:
+        import Crypto as _parent
+    except (ImportError, SyntaxError):  # Old Crypto gives SyntaxError in newer Python
+        _parent = EnhancedModule('Cryptodome')
+        __bool__ = lambda: False
+
+
+@functools.cache
+def __getattr__(name):
+    try:
+        submodule = importlib.import_module(f'.{name}', _parent.__name__)
+    except ImportError:
+        return getattr(_parent, name)
+    return passthrough_module(f'{__name__}.{name}', submodule)
+
+
+@property
+@functools.cache
+def _yt_dlp__identifier():
+    if _parent.__name__ == 'Crypto':
+        from Crypto.Cipher import AES
+        try:
+            # In pycrypto, mode defaults to ECB. See:
+            # https://www.pycryptodome.org/en/latest/src/vs_pycrypto.html#:~:text=not%20have%20ECB%20as%20default%20mode
+            AES.new(b'abcdefghijklmnop')
+        except TypeError:
+            return 'pycrypto'
+    return _parent.__name__