<PackageReference Include="BouncyCastle.Cryptography" Version="2.3.0" />

Org.BouncyCastle.Cms.CmsAuthenticatedDataParser

public string MacAlgOid { get; }

public Asn1Object MacAlgParams { get; }

public CmsAuthenticatedDataParser(byte[] envelopedData)

public CmsAuthenticatedDataParser(Stream envelopedData)

public byte[] GetMac()