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using System;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.Cms
{
public class RecipientInfo
: Asn1Encodable, IAsn1Choice
{
public static RecipientInfo GetInstance(object o)
{
if (o == null)
return null;
if (o is RecipientInfo recipientInfo)
return recipientInfo;
if (o is Asn1Sequence sequence)
return new RecipientInfo(sequence);
if (o is Asn1TaggedObject taggedObject)
return new RecipientInfo(taggedObject);
throw new ArgumentException("unknown object in factory: " + Platform.GetTypeName(o), nameof(o));
}
public static RecipientInfo GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return Asn1Utilities.GetInstanceFromChoice(taggedObject, declaredExplicit, GetInstance);
}
internal Asn1Encodable info;
public RecipientInfo(
KeyTransRecipientInfo info)
{
this.info = info;
}
public RecipientInfo(
KeyAgreeRecipientInfo info)
{
this.info = new DerTaggedObject(false, 1, info);
}
public RecipientInfo(
KekRecipientInfo info)
{
this.info = new DerTaggedObject(false, 2, info);
}
public RecipientInfo(
PasswordRecipientInfo info)
{
this.info = new DerTaggedObject(false, 3, info);
}
public RecipientInfo(
OtherRecipientInfo info)
{
this.info = new DerTaggedObject(false, 4, info);
}
public RecipientInfo(
Asn1Object info)
{
this.info = info;
}
public DerInteger Version
{
get
{
if (info is Asn1TaggedObject o)
{
switch (o.TagNo)
{
case 1:
return KeyAgreeRecipientInfo.GetInstance(o, false).Version;
case 2:
return GetKekInfo(o).Version;
case 3:
return PasswordRecipientInfo.GetInstance(o, false).Version;
case 4:
return new DerInteger(0); // no syntax version for OtherRecipientInfo
default:
throw new InvalidOperationException("unknown tag");
}
}
return KeyTransRecipientInfo.GetInstance(info).Version;
}
}
public bool IsTagged
{
get { return info is Asn1TaggedObject; }
}
public Asn1Encodable Info
{
get
{
if (info is Asn1TaggedObject o)
{
switch (o.TagNo)
{
case 1:
return KeyAgreeRecipientInfo.GetInstance(o, false);
case 2:
return GetKekInfo(o);
case 3:
return PasswordRecipientInfo.GetInstance(o, false);
case 4:
return OtherRecipientInfo.GetInstance(o, false);
default:
throw new InvalidOperationException("unknown tag");
}
}
return KeyTransRecipientInfo.GetInstance(info);
}
}
private KekRecipientInfo GetKekInfo(
Asn1TaggedObject o)
{
// For compatibility with erroneous version, we don't always pass 'false' here
return KekRecipientInfo.GetInstance(o, o.IsExplicit());
}
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* RecipientInfo ::= CHOICE {
* ktri KeyTransRecipientInfo,
* kari [1] KeyAgreeRecipientInfo,
* kekri [2] KekRecipientInfo,
* pwri [3] PasswordRecipientInfo,
* ori [4] OtherRecipientInfo }
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
return info.ToAsn1Object();
}
}
}
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