Attempting to block_decrypt with a different key returns a FunctionClauseError

[Qqwy]

Given the following example, where a non-matching key is used for decryption:

encryption_key = JOSE.JWK.from_oct(<<0::128>>)
different_key = JOSE.JWK.from_oct(<<1::128>>)

encrypted_a128gcmkw = JOSE.JWE.block_encrypt(encryption_key, "{}", %{ "alg" => "A128GCMKW", "enc" => "A128GCM" }) |> JOSE.JWE.compact |> elem(1)
JOSE.JWE.block_decrypt(different_key, encrypted_a128gcmkw) |> elem(0)

Expected Result

Some descriptive error message, stating that a non-matching key was used.

Actual Result

** (FunctionClauseError) no function clause matching in :jose_jwe_enc_aes.block_decrypt/4

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Improving this would be great, because in a system where multiple remote parties connect to each-other using JOSE, implementers need good feedback to know where implementation mistakes are happening (malformed key? malformed cyphertext? malformed plain text after decoding?).

It would be even nicer if you can alter the signature of the decryption functions to return ok/error-tuples, and provide versions with bangs that throw.

[Qqwy]

If someone can point me a little bit to what causes this error, I would be willing to contribute a PR.