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using System;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;
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 KeyAgreeRecipientInfo(
OriginatorIdentifierOrKey originator,
Asn1OctetString ukm,
AlgorithmIdentifier keyEncryptionAlgorithm,
Asn1Sequence recipientEncryptedKeys)
{
this.version = new DerInteger(3);
this.originator = originator;
this.ukm = ukm;
this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
this.recipientEncryptedKeys = recipientEncryptedKeys;
}
public KeyAgreeRecipientInfo(Asn1Sequence seq)
{
int index = 0;
version = (DerInteger) seq[index++];
originator = OriginatorIdentifierOrKey.GetInstance((Asn1TaggedObject)seq[index++], true);
if (seq[index] is Asn1TaggedObject taggedObject)
{
ukm = Asn1OctetString.GetInstance(taggedObject, true);
++index;
}
keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[index++]);
recipientEncryptedKeys = (Asn1Sequence)seq[index++];
}
/**
* return a KeyAgreeRecipientInfo object from a tagged object.
*
* @param obj the tagged object holding the object we want.
* @param explicitly true if the object is meant to be explicitly
* tagged false otherwise.
* @exception ArgumentException if the object held by the
* tagged object cannot be converted.
*/
public static KeyAgreeRecipientInfo GetInstance(
Asn1TaggedObject obj,
bool explicitly)
{
return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
}
/**
* return a KeyAgreeRecipientInfo object from the given object.
*
* @param obj the object we want converted.
* @exception ArgumentException if the object cannot be converted.
*/
public static KeyAgreeRecipientInfo GetInstance(
object obj)
{
if (obj == null || obj is KeyAgreeRecipientInfo)
return (KeyAgreeRecipientInfo)obj;
if (obj is Asn1Sequence)
return new KeyAgreeRecipientInfo((Asn1Sequence)obj);
throw new ArgumentException(
"Illegal object in KeyAgreeRecipientInfo: " + Platform.GetTypeName(obj));
}
public DerInteger Version
{
get { return version; }
}
public OriginatorIdentifierOrKey Originator
{
get { return originator; }
}
public Asn1OctetString UserKeyingMaterial
{
get { return ukm; }
}
public AlgorithmIdentifier KeyEncryptionAlgorithm
{
get { return keyEncryptionAlgorithm; }
}
public Asn1Sequence RecipientEncryptedKeys
{
get { return recipientEncryptedKeys; }
}
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* KeyAgreeRecipientInfo ::= Sequence {
* version CMSVersion, -- always set to 3
* originator [0] EXPLICIT OriginatorIdentifierOrKey,
* ukm [1] EXPLICIT UserKeyingMaterial OPTIONAL,
* keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
* recipientEncryptedKeys RecipientEncryptedKeys
* }
*
* UserKeyingMaterial ::= OCTET STRING
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(version, new DerTaggedObject(true, 0, originator));
v.AddOptionalTagged(true, 1, ukm);
v.Add(keyEncryptionAlgorithm, recipientEncryptedKeys);
return new DerSequence(v);
}
}
}
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