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Fix sigalg→sign_alg param naming for create_authn_request in POST binding - #432
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peppelinux merged 2 commits intoNov 9, 2026
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When signing is enabled and POST binding with a custom template is used, sso_kwargs["sigalg"] was passed directly to client.create_authn_request(), which expects the parameter as "sign_alg". This caused the signing algorithm to be silently ignored (absorbed by **kwargs).
The fix copies sso_kwargs before the create_authn_request call, pops "sigalg", and passes it as "sign_alg". The original sso_kwargs dict remains unchanged for prepare_for_authenticate calls, which correctly expect "sigalg".
Adds a test verifying create_authn_request receives sign_alg (not sigalg).
Fixes #433