using Org.BouncyCastle.Asn1.X509; namespace Org.BouncyCastle.Asn1.Cms { public class KeyAgreeRecipientInfo : Asn1Encodable { private DerInteger version; private OriginatorIdentifierOrKey originator; private Asn1OctetString ukm; private AlgorithmIdentifier keyEncryptionAlgorithm; private Asn1Sequence recipientEncryptedKeys; public DerInteger Version => version; public OriginatorIdentifierOrKey Originator => originator; public Asn1OctetString UserKeyingMaterial => ukm; public AlgorithmIdentifier KeyEncryptionAlgorithm => keyEncryptionAlgorithm; public Asn1Sequence RecipientEncryptedKeys => recipientEncryptedKeys; public static KeyAgreeRecipientInfo GetInstance(object obj) { if (obj == null) return null; KeyAgreeRecipientInfo keyAgreeRecipientInfo = obj as KeyAgreeRecipientInfo; if (keyAgreeRecipientInfo != null) return keyAgreeRecipientInfo; return new KeyAgreeRecipientInfo(Asn1Sequence.GetInstance(obj)); } public static KeyAgreeRecipientInfo GetInstance(Asn1TaggedObject obj, bool explicitly) { return new KeyAgreeRecipientInfo(Asn1Sequence.GetInstance(obj, explicitly)); } public KeyAgreeRecipientInfo(OriginatorIdentifierOrKey originator, Asn1OctetString ukm, AlgorithmIdentifier keyEncryptionAlgorithm, Asn1Sequence recipientEncryptedKeys) { version = new DerInteger(3); this.originator = originator; this.ukm = ukm; this.keyEncryptionAlgorithm = keyEncryptionAlgorithm; this.recipientEncryptedKeys = recipientEncryptedKeys; } public KeyAgreeRecipientInfo(Asn1Sequence seq) { int num = 0; version = (DerInteger)seq[num++]; originator = OriginatorIdentifierOrKey.GetInstance((Asn1TaggedObject)seq[num++], true); Asn1TaggedObject asn1TaggedObject = seq[num] as Asn1TaggedObject; if (asn1TaggedObject != null) { ukm = Asn1OctetString.GetInstance(asn1TaggedObject, true); num++; } keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[num++]); recipientEncryptedKeys = (Asn1Sequence)seq[num++]; } public override Asn1Object ToAsn1Object() { Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector(version, new DerTaggedObject(true, 0, originator)); asn1EncodableVector.AddOptionalTagged(true, 1, ukm); asn1EncodableVector.Add(keyEncryptionAlgorithm, recipientEncryptedKeys); return new DerSequence(asn1EncodableVector); } } }