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# Namespace pdftron.Crypto

### Classes

#### AlgorithmIdentifier

This class represents an algorithm identifier, as defined by ITU and used in X.509.

#### AlgorithmParams

Base class for AlgorithmIdentifier parameters.

#### DigestAlgorithm

#### 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. See the X.500 standards, RFC 5280, and an OID repository for more information.

#### X509Certificate

This class represents an X509 public-key certificate, as specified in RFC 5280.

#### X509Extension

This class represents an X509v3 certificate extension. See RFC 5280 as a specification.

### Enums

#### DigestAlgorithm.Type

#### ObjectIdentifier.Predefined