Function validate_attestation_doc_in_cert 

pub fn validate_attestation_doc_in_cert(
    given_cert: &X509Certificate<'_>,
) -> AttestResult<AttestationDoc>

Attests a connection to a Cage by:

• Validating the cert structure
• Extracting the attestation doc from the Subject Alt Names
• Decoding and validating the attestation doc
• Validating the signature on the attestation doc
• Validating that the PCRs of the attestation doc are as expected

Errors

Will return an error if:

• The cose1 encoded attestation doc fails to parse, or its signature is invalid
• The attestation document is not signed by the nitro cert chain
• The public key from the certificate is not present in the attestation document’s challenge
• Any of the certificates are malformed