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using System;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.Cms
{
public class KeyTransRecipientInfo
: Asn1Encodable
{
private DerInteger version;
private RecipientIdentifier rid;
private AlgorithmIdentifier keyEncryptionAlgorithm;
private Asn1OctetString encryptedKey;
public KeyTransRecipientInfo(
RecipientIdentifier rid,
AlgorithmIdentifier keyEncryptionAlgorithm,
Asn1OctetString encryptedKey)
{
if (rid.ToAsn1Object() is Asn1TaggedObject)
{
this.version = new DerInteger(2);
}
else
{
this.version = new DerInteger(0);
}
this.rid = rid;
this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
this.encryptedKey = encryptedKey;
}
public KeyTransRecipientInfo(
Asn1Sequence seq)
{
this.version = (DerInteger) seq[0];
this.rid = RecipientIdentifier.GetInstance(seq[1]);
this.keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[2]);
this.encryptedKey = (Asn1OctetString) seq[3];
}
/**
* return a KeyTransRecipientInfo object from the given object.
*
* @param obj the object we want converted.
* @exception ArgumentException if the object cannot be converted.
*/
public static KeyTransRecipientInfo GetInstance(
object obj)
{
if (obj == null || obj is KeyTransRecipientInfo)
return (KeyTransRecipientInfo) obj;
if(obj is Asn1Sequence)
return new KeyTransRecipientInfo((Asn1Sequence) obj);
throw new ArgumentException(
"Illegal object in KeyTransRecipientInfo: " + Platform.GetTypeName(obj));
}
public DerInteger Version
{
get { return version; }
}
public RecipientIdentifier RecipientIdentifier
{
get { return rid; }
}
public AlgorithmIdentifier KeyEncryptionAlgorithm
{
get { return keyEncryptionAlgorithm; }
}
public Asn1OctetString EncryptedKey
{
get { return encryptedKey; }
}
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* KeyTransRecipientInfo ::= Sequence {
* version CMSVersion, -- always set to 0 or 2
* rid RecipientIdentifier,
* keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
* encryptedKey EncryptedKey
* }
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
return new DerSequence(version, rid, keyEncryptionAlgorithm, encryptedKey);
}
}
}
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