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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) =>
Asn1Utilities.GetInstanceChoice(taggedObject, declaredExplicit, GetInstance);
public static RecipientInfo GetTagged(Asn1TaggedObject taggedObject, bool declaredExplicit) =>
Asn1Utilities.GetTaggedChoice(taggedObject, declaredExplicit, GetInstance);
private readonly Asn1Encodable m_info;
public RecipientInfo(KeyTransRecipientInfo info)
{
m_info = info ?? throw new ArgumentNullException(nameof(info));
}
public RecipientInfo(KeyAgreeRecipientInfo info)
{
m_info = new DerTaggedObject(false, 1, info);
}
public RecipientInfo(KekRecipientInfo info)
{
m_info = new DerTaggedObject(false, 2, info);
}
public RecipientInfo(PasswordRecipientInfo info)
{
m_info = new DerTaggedObject(false, 3, info);
}
public RecipientInfo(OtherRecipientInfo info)
{
m_info = new DerTaggedObject(false, 4, info);
}
public RecipientInfo(Asn1Object info)
{
m_info = info ?? throw new ArgumentNullException(nameof(info));
}
[Obsolete("Will be removed")]
public DerInteger Version
{
get
{
if (!(m_info is Asn1TaggedObject tagged))
return KeyTransRecipientInfo.GetInstance(m_info).Version;
if (tagged.HasContextTag())
{
switch (tagged.TagNo)
{
case 1:
return KeyAgreeRecipientInfo.GetInstance(tagged, false).Version;
case 2:
return GetKekInfo(tagged).Version;
case 3:
return PasswordRecipientInfo.GetInstance(tagged, false).Version;
case 4:
return DerInteger.Zero; // no syntax version for OtherRecipientInfo
}
}
throw new InvalidOperationException("unknown tag");
}
}
public bool IsTagged => m_info is Asn1TaggedObject;
public Asn1Encodable Info
{
get
{
if (!(m_info is Asn1TaggedObject tagged))
return KeyTransRecipientInfo.GetInstance(m_info);
if (tagged.HasContextTag())
{
switch (tagged.TagNo)
{
case 1:
return KeyAgreeRecipientInfo.GetInstance(tagged, false);
case 2:
return GetKekInfo(tagged);
case 3:
return PasswordRecipientInfo.GetInstance(tagged, false);
case 4:
return OtherRecipientInfo.GetInstance(tagged, false);
}
}
throw new InvalidOperationException("unknown tag");
}
}
private KekRecipientInfo GetKekInfo(Asn1TaggedObject tagged)
{
// For compatibility with erroneous version, we don't always pass 'false' here
bool declaredExplicit = tagged.IsExplicit();
return KekRecipientInfo.GetInstance(tagged, declaredExplicit);
}
/**
* 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() => m_info.ToAsn1Object();
internal bool IsKeyTransV0()
{
if (m_info is Asn1TaggedObject)
return false;
var ktri = KeyTransRecipientInfo.GetInstance(m_info);
return ktri.Version.HasValue(0);
}
internal bool IsPasswordOrOther()
{
if (m_info is Asn1TaggedObject tagged && tagged.HasContextTag())
{
switch (tagged.TagNo)
{
case 3:
case 4:
return true;
}
}
return false;
}
}
}
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