using System; namespace Org.BouncyCastle.Asn1.Cms { public class EncryptedData : Asn1Encodable { private readonly DerInteger version; private readonly EncryptedContentInfo encryptedContentInfo; private readonly Asn1Set unprotectedAttrs; public virtual DerInteger Version => version; public virtual EncryptedContentInfo EncryptedContentInfo => encryptedContentInfo; public virtual Asn1Set UnprotectedAttrs => unprotectedAttrs; public static EncryptedData GetInstance(object obj) { if (obj == null) return null; EncryptedData encryptedData = obj as EncryptedData; if (encryptedData != null) return encryptedData; return new EncryptedData(Asn1Sequence.GetInstance(obj)); } public static EncryptedData GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit) { return new EncryptedData(Asn1Sequence.GetInstance(taggedObject, declaredExplicit)); } public EncryptedData(EncryptedContentInfo encInfo) : this(encInfo, null) { } public EncryptedData(EncryptedContentInfo encInfo, Asn1Set unprotectedAttrs) { if (encInfo == null) throw new ArgumentNullException("encInfo"); version = new DerInteger((unprotectedAttrs != null) ? 2 : 0); encryptedContentInfo = encInfo; this.unprotectedAttrs = unprotectedAttrs; } private EncryptedData(Asn1Sequence seq) { int count = seq.Count; if (count < 2 || count > 3) throw new ArgumentException("Bad sequence size: " + count.ToString(), "seq"); int sequencePosition = 0; version = DerInteger.GetInstance(seq[sequencePosition++]); encryptedContentInfo = EncryptedContentInfo.GetInstance(seq[sequencePosition++]); unprotectedAttrs = Asn1Utilities.ReadOptionalContextTagged(seq, ref sequencePosition, 0, false, Asn1Set.GetInstance); if (sequencePosition != count) throw new ArgumentException("Unexpected elements in sequence", "seq"); } public override Asn1Object ToAsn1Object() { Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector(version, encryptedContentInfo); if (unprotectedAttrs != null) asn1EncodableVector.Add(new BerTaggedObject(false, 1, unprotectedAttrs)); return new BerSequence(asn1EncodableVector); } } }