trust_is_certificate_distrusted
Description:
public bool trust_is_certificate_distrusted (uint8[] serial_nr, uint8[] issuer, Cancellable? cancellable = null) throws Error
Checks whether the certificate that can be uniquely identified with the given serial_nr and issuer is marked as 
      distrusted (for example by the user, or because it's part of a CRL).
Since we can't directly use [iface@Certificate] to fetch these values, you need to call these with the raw serial number and issuer as provided by the PKCS#11 fields `CKA_SERIAL_NR` and `CKA_ISSUER`.
Parameters:
| serial_nr | 
           The serial number of the certificate  | 
      
| issuer | 
           The raw issuer  | 
      
| cancellable | 
           a Cancellable or null  | 
      
| issuer_len | 
           The nr of bytes in   | 
      
| serial_nr_len | 
           The nr of bytes in   | 
      
Returns:
| 
           true if the certificate is marked as distrusted  | 
      
Namespace: Gcr
  
  Package: gcr-4