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CibaRequestSigningAlg.php

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CibaRequestSigningAlg
The JWS algorithm a CIBA client signs its authentication requests with (CIBA Core §4 `backchannel_authentication_request_signing_alg`, §7.1.1). Exactly the three algorithms AXIAM verifies on any client-signed JWT (`axiam_oauth2::jose::PERMITTED_ALGORITHMS`): FAPI 2.0 §5.3.1.1's list. A registration naming anything else — `RS256`, `HS256`, `none` — is refused rather than stored, so no row can hold an algorithm the verifier would not honour (D-61).
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