public KeyAgreeRecipientIdentifier(
     RecipientKeyIdentifier rKeyID)
 {
     this.rKeyID = rKeyID;
 }
 public SmimeEncryptionKeyPreferenceAttribute(
     RecipientKeyIdentifier rKeyID)
     : base(SmimeAttributes.EncrypKeyPref,
         new DerSet(new DerTaggedObject(false, 1, rKeyID)))
 {
 }