[erlang-questions] Retrieve public key from DER encoded certificate

[Eric Meadows-Jönsson]

I have a DER encoded certificate that i decode to #'Certificate' with
public_key:pkix_decode_cert(Cert, plain). From the certificate I
retrieve #'SubjectPublicKeyInfo' which I pass to
publick_key:pem_entry_decode/1 to get rsa_public_key() or dsa_public_key().

But this function call fails because pem_entry_decode/1 does not seem to
expect #'SubjectPublicKeyInfo' to be already decoded. It already has the
structure that it tries to decode to here
https://github.com/erlang/otp/blob/382943f9a943eb4215a297f9445e21fb9b5c0633/lib/public_key/src/public_key.erl#L119-L120
.

How should I retrieve rsa_public_key() | dsa_public_key() from a DER
encoded certificate?

-- 
Eric Meadows-Jönsson
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