- certificate_field(+Certificate, ?Field) is nondet
- Retrieve the field matching Field from Certificate. May be
one of the following:
- subject/1 to retrieve the subject
- issuer/1 to retrieve the issuer's subject
- version/1 to retrieve the version
- serial/1 to retrieve the serial number
- not_before/1 to retrieve the start date
- not_after/1 to retrieve the expiry date
- public_key/1 to retrieve the public key
- crls/1 to retrieve a list of the CRLs
- sans/1 to retrieve a list of the Subject Alternative Names
- signature/1 to retrieve the certificate signature
- signature_algorithm/1 to retrieve the signing algorithm
- hash/1 to retrieve the certificate hash
- to_be_signed/1 to retrieve the data on the certificate which
must be signed