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export_secret_key from StatefulSignature: TypeError: LoadLibrary() argument 1 must be str, not None #136
Description
On my Python configuration (Windows 11, Python 3.14.4 32 bits, my own oqs.dll), the export_secret_key method applied on Stateful Signature algo returns the error "TypeError: LoadLibrary() argument 1 must be str, not None" on this line:
ct.CDLL(ct.util.find_library("c")).free(buf_ptr)
~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
Actually, the example stfl_sig.py fails when removing the comment line 33:
# secret_key = signer.export_secret_key()
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fjumelle commentedon May 7, 2026
Another remark: with Python 3.14.4 64 bits, the same function 'export_secret_key' in StatefulSignature (with algo class fails "ctypes.ArgumentError: argument 3: OverflowError: int too long to convert" at this line when running the stfl_sig.py example:
rc = native().OQS_SIG_STFL_SECRET_KEY_serialize( ct.byref(buf_ptr), ct.byref(buf_len), self._secret_key )dstebila commentedon May 14, 2026
@fjumelle Could you check if the changes in #141 address your issues?
Fix StatefulSignature.export_secret_key TypeErrors on Windows (#141)
fjumelle commentedon May 15, 2026
@dstebila I confirm that all is now fine.