“EdDSA” algorithm not working

[krallowski]

Hey there,
I already wrote in the Elixir Forum and was guided here to report an issue.
We use AshAuthentication in our Phoenix liveview application and Rauthy in our dev environment as oidc provider. When we leave it to the default id token signed response algorithm (RS256) it workes fine, but when we set id_token_signed_response_alg "EdDSA" I get the following error:

[error] ** (FunctionClauseError) no function clause matching in Assent.JWTAdapter.AssentJWT.verify_message/4
    (assent 0.2.13) lib/assent/jwt_adapter/assent_jwt.ex:243: Assent.JWTAdapter.AssentJWT.verify_message("eyJhbGciOiJFZERTQSIsImtpZCI6IjJSZkJzR1d2b09xeG1WZTlucXFTODNyTiIsInR5cCI6IkpXVCJ9.eyJpYXQiOjE3NTA2ODE2OTksIm5iZiI6MTc1MDY4MTY5OSwiZXhwIjoxNzUwNjgzNDk5LCJpc3MiOiJodHRwOi8vbG9jYWxob3N0OjgwODAvYXV0aC92MSIsImF1ZCI6Im12Iiwic3ViIjoieWRoelNsNkFoSHFGZFk2aG9uM3pMUjVjIiwidHlwIjoiSWQiLCJhenAiOiJtdiIsInNjb3BlIjoib3BlbmlkIiwicHJlZmVycmVkX3VzZXJuYW1lIjoiYWRtaW5AbG9jYWxob3N0IiwiYW1yIjpbInB3ZCJdLCJhdXRoX3RpbWUiOjE3NTA2ODE2OTksImF0X2hhc2giOiJPNEsweWVraTFEbEJOenc2UjVyWkVaTkxRaEZVOVJzWFZyQ3hIWHQxVFpRIiwic2lkIjoiZ0xDY1B4RUVuMGJWd0pQeTNpa0lPSWIwRG5lbnU1NGoiLCJub25jZSI6InN1QnlJSVBjWXdCdFRBaW1qTkdKTVEiLCJyb2xlcyI6WyJyYXV0aHlfYWRtaW4iLCJhZG1pbiJdfQ", <<22, 212, 17, 15, 242, 194, 83, 153, 181, 180, 241, 92, 238, 104, 246, 152, 133, 203, 4, 249, 211, 224, 221, 157, 158, 14, 108, 36, 31, 116, 231, 7, 208, 38, 201, 119, 251, 219, 167, 42, 151, 70, 167, 63, 240, 165, 151, 11, 189, 254, ...>>, "EdDSA", %{"alg" => "EdDSA", "crv" => "Ed25519", "kid" => "2RfBsGWvoOqxmVe9nqqS83rN", "kty" => "OKP", "x" => "suXSvDkHWWx686g8EcwrcnCN7SH_0nwDvKqzshvpy3Q"})
    (assent 0.2.13) lib/assent/jwt_adapter/assent_jwt.ex:229: Assent.JWTAdapter.AssentJWT.do_verify/5
    (assent 0.2.13) lib/assent/jwt_adapter/assent_jwt.ex:149: Assent.JWTAdapter.AssentJWT.verify/3
    (assent 0.2.13) lib/assent/strategies/oidc.ex:311: Assent.Strategy.OIDC.validate_id_token/2
    (assent 0.2.13) lib/assent/strategies/oidc.ex:279: Assent.Strategy.OIDC.fetch_user/2
    (assent 0.2.13) lib/assent/strategies/oauth2.ex:387: Assent.Strategy.OAuth2.fetch_user_with_strategy/3
    (ash_authentication 4.9.3) lib/ash_authentication/strategies/oauth2/plug.ex:60: AshAuthentication.Strategy.OAuth2.Plug.callback/2
    (ash_authentication 4.9.3) lib/ash_authentication/plug/dispatcher.ex:30: AshAuthentication.Plug.Dispatcher.call/2
    (phoenix 1.7.21) lib/phoenix/router/route.ex:42: Phoenix.Router.Route.call/2
    (phoenix 1.7.21) lib/phoenix/router.ex:484: Phoenix.Router.__call__/5
    (mv 0.1.0) lib/mv_web/endpoint.ex:1: MvWeb.Endpoint.plug_builder_call/2
    (mv 0.1.0) deps/plug/lib/plug/debugger.ex:155: MvWeb.Endpoint."call (overridable 3)"/2
    (mv 0.1.0) lib/mv_web/endpoint.ex:1: MvWeb.Endpoint.call/2
    (phoenix 1.7.21) lib/phoenix/endpoint/sync_code_reload_plug.ex:22: Phoenix.Endpoint.SyncCodeReloadPlug.do_call/4
    (bandit 1.7.0) lib/bandit/pipeline.ex:131: Bandit.Pipeline.call_plug!/2
    (bandit 1.7.0) lib/bandit/pipeline.ex:42: Bandit.Pipeline.run/5
    (bandit 1.7.0) lib/bandit/http1/handler.ex:13: Bandit.HTTP1.Handler.handle_data/3
    (bandit 1.7.0) lib/bandit/delegating_handler.ex:18: Bandit.DelegatingHandler.handle_data/3
    (bandit 1.7.0) lib/bandit/delegating_handler.ex:8: Bandit.DelegatingHandler.handle_info/2
    (stdlib 6.2.2) gen_server.erl:2345: :gen_server.try_handle_info/3

Am I missing something or is this an issue?
Link to my post in the elixir forum: https://elixirforum.com/t/ashauthentication-eddsa-algorithm-not-working/71401/2

Best regards and thanks in advance!