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

Org.BouncyCastle.Asn1.X509.AltSignatureAlgorithm

public static AltSignatureAlgorithm GetInstance(object obj)

public static AltSignatureAlgorithm GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)

public static AltSignatureAlgorithm GetTagged(Asn1TaggedObject taggedObject, bool declaredExplicit)