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+"""smartcard.guid
+
+Utility functions to handle GUIDs as strings or list of bytes
+
+__author__ = "https://www.gemalto.com/"
+
+Copyright 2001-2012 gemalto
+Author: Jean-Daniel Aussel, mailto:jean-daniel.aussel@gemalto.com
+
+This file is part of pyscard.
+
+pyscard is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+pyscard is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with pyscard; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+"""
+
+import uuid
+
+
+def strToGUID(s: str) -> list[int]:
+    """Converts a GUID string into a list of bytes.
+
+    >>> strToGUID('{AD4F1667-EA75-4124-84D4-641B3B197C65}')
+    [103, 22, 79, 173, 117, 234, 36, 65, 132, 212, 100, 27, 59, 25, 124, 101]
+    """
+    return list(uuid.UUID(s).bytes_le)
+
+
+def GUIDToStr(g: list[int]) -> str:
+    """Converts a GUID sequence of bytes into a string.
+
+    >>> GUIDToStr([103,22,79,173,  117,234,  36,65,
+    ...            132, 212, 100, 27, 59, 25, 124, 101])
+    '{AD4F1667-EA75-4124-84D4-641B3B197C65}'
+    """
+    return f"{{{uuid.UUID(bytes_le=bytes(g))}}}".upper()