<PackageReference Include="BouncyCastle.Cryptography" Version="2.3.1" />

Org.BouncyCastle.Cms.CmsEnvelopedData

public class CmsEnvelopedData
namespace Org.BouncyCastle.Cms { public class CmsEnvelopedData { public AlgorithmIdentifier EncryptionAlgorithmID { get; } public string EncryptionAlgOid { get; } public ContentInfo ContentInfo { get; } public CmsEnvelopedData(byte[] envelopedData); public CmsEnvelopedData(Stream envelopedData); public CmsEnvelopedData(ContentInfo contentInfo); public RecipientInformationStore GetRecipientInfos(); public Org.BouncyCastle.Asn1.Cms.AttributeTable GetUnprotectedAttributes(); public byte[] GetEncoded(); } }