JWKs with signing alg but use equals "enc"

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Victor Nascimento

Oct 15, 2021, 8:50:54 AMOct 15
to Keycloak Dev
Hi lovely people!

I think there is a misinterpretation of the JWA specification currently on Keycloak. If you add an rsa-key provider with use "enc", you still have to choose an alg and there are only JWS algorithms (which is not enc use but sig use).

Both claims in a JWK are optional as I understand, but when present they must be the "intended". Here are the specifics from the spec:


>> The "use" (public key use) parameter identifies the intended use of the public key. The "use" parameter is employed to indicate whether a public key is used for encrypting data or verifying the signature on data.


>> The "alg" (algorithm) parameter identifies the algorithm intended for use with the key.

There are clients that will break with having alg as a JWS alg and use as enc.

Sorry if this has been reported before. I tried to find some relations about it but couldn't.

Kind regards,


Nov 18, 2021, 3:28:54 PMNov 18
to keyclo...@googlegroups.com



This issue has been resolved.




Takashi Norimatsu

Hitachi, Ltd.

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