<PackageReference Include="BouncyCastle.Cryptography" Version="2.6.2" />

TrustAnchor

public class TrustAnchor
A trust anchor or most-trusted Certification Authority (CA). This class represents a "most-trusted CA", which is used as a trust anchor for validating X.509 certification paths. A most-trusted CA includes the public key of the CA, the CA's name, and any constraints upon the set of paths which may be validated using this key. These parameters can be specified in the form of a trusted X509Certificate or as individual parameters.
public X509Name CA { get; }

Returns the name of the most-trusted CA as an X509Name.

public string CAName { get; }

Returns the name of the most-trusted CA in RFC 2253 string format.

public AsymmetricKeyParameter CAPublicKey { get; }

Returns the public key of the most-trusted CA.

public byte[] GetNameConstraints { get; }

public X509Certificate TrustedCert { get; }

Returns the most-trusted CA certificate.

public TrustAnchor(X509Certificate trustedCert, byte[] nameConstraints)

Creates an instance of TrustAnchor with the specified X509Certificate and optional name constraints, which are intended to be used as additional constraints when validating an X.509 certification path. The name constraints are specified as a byte array. This byte array should contain the DER encoded form of the name constraints, as they would appear in the NameConstraints structure defined in RFC 2459 and X.509. The ASN.1 definition of this structure appears below. NameConstraints ::= SEQUENCE { permittedSubtrees [0] GeneralSubtrees OPTIONAL, excludedSubtrees [1] GeneralSubtrees OPTIONAL } GeneralSubtrees ::= SEQUENCE SIZE (1..MAX) OF GeneralSubtree GeneralSubtree ::= SEQUENCE { base GeneralName, minimum [0] BaseDistance DEFAULT 0, maximum [1] BaseDistance OPTIONAL } BaseDistance ::= INTEGER (0..MAX) GeneralName ::= CHOICE { otherName [0] OtherName, rfc822Name [1] IA5String, dNSName [2] IA5String, x400Address [3] ORAddress, directoryName [4] Name, ediPartyName [5] EDIPartyName, uniformResourceIdentifier [6] IA5String, iPAddress [7] OCTET STRING, registeredID [8] OBJECT IDENTIFIER} Note that the name constraints byte array supplied is cloned to protect against subsequent modifications.

public TrustAnchor(X509Name caPrincipal, AsymmetricKeyParameter pubKey, byte[] nameConstraints)

Creates an instance of TrustAnchor where the most-trusted CA is specified as an X500Principal and public key.

public TrustAnchor(string caName, AsymmetricKeyParameter pubKey, byte[] nameConstraints)

Creates an instance of TrustAnchor where the most-trusted CA is specified as a distinguished name and public key. Name constraints are an optional parameter, and are intended to be used as additional constraints when validating an X.509 certification path. The name constraints are specified as a byte array. This byte array contains the DER encoded form of the name constraints, as they would appear in the NameConstraints structure defined in RFC 2459 and X.509.