| AlgorithmIdentifier | This class represents an algorithm identifier, as defined by ITU and used in X.509. |
| AlgorithmParams | Base class for AlgorithmIdentifier parameters. |
| ObjectIdentifier | This class represents an object identifier (OID), as defined by ITU and used in X.509. |
| RSASSAPSSParams | Parameters for the RSASSA-PSS algorithm. |
| X501AttributeTypeAndValue | This class represents an AttributeTypeAndValue as mentioned in RFC 5280 in the context of DistinguishedNames and as defined in ITU X.501. |
| X501DistinguishedName | This class represents a distinguished name (DN) as defined in X.501. |
| X509Certificate | This class represents an X509 public-key certificate, as specified in RFC 5280. |
| X509Extension | This class represents an X509v3 certificate extension. |