Calling JOSE.JWK.block_encrypt with an invalid JWK never resolve

[arnaudmorisset]

Expected Behavior

Either:

• Calling JOSE.JWK.block_encrypt/3 with an invalid value for the third argument (jwk) should send back a relevant error.
• Calling JOSE.JWK.from_pem/1 with an invalid key as an argument should send back an error instead of [].

Current Behavior

Calling JOSE.JWK.block_encrypt/3 with an invalid value for the third argument (jwk) hangs and never resolve.

Steps to Reproduce

1. Open an interactive shell in a Mix project using erlang-jose
2. Parse an invalid Public Key using JOSE.JWK.from_pem/1; you should get []
3. Use [] as the third argument when calling JOSE.JWK.block_encrypt/3
4. The process will hang, and you will be forced to interrupt it

Context (Environment)

After a configuration error, we got an invalid Public Key in our database, and we tried to use it to generate a JWK, then we try to use this invalid result to encrypt a token. As the function call was never resolved, our HTTP endpoint produced a timeout error.

[1st8]

Did you find a workaround?

[arnaudmorisset]

@1st8 Adding defensive code around the function call to be sure that we never call it with an invalid value. 🤷‍♂️