Hi,

I woud like to sign a certificate with my internal intermediate (CA) 
certificate and add the AuthorityKeyIdentifier Extension with 
authority_cert_issuer and authority_cert_serial_number. Only key_identifier 
work, but with authority_cert_issuer and authority_cert_serial_number I get 
this error: 

authority_cert_issuer must be a list of GeneralName objects

I try to use the subject of the public certificate of my intermediate 
certificate. The Code looks like this:

builder = builder.add_extension(
    x509.AuthorityKeyIdentifier(
        
x509.AuthorityKeyIdentifier.from_issuer_public_key(caCert.cert.public_key()),
        caCert.cert.subject,
        caCert.cert.serial,
    ),
    critical=False,
)

In caCert.cert I have loaded the public certificate of my Intermediate CA. In 
caCert.key is my private key, witch I use to sign it.

How can I generate authority_cert_issuer and authority_cert_serial_number from 
the CAs public certificate?

I`m just a hoby programmer and not a pro, so it would be very nice, if someone 
can help me with this issue.

Kind regards 
Julian
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