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using System;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.Pkcs
{
/**
* The EncryptedData object.
* <pre>
* EncryptedData ::= Sequence {
* version Version,
* encryptedContentInfo EncryptedContentInfo
* }
*
*
* EncryptedContentInfo ::= Sequence {
* contentType ContentType,
* contentEncryptionAlgorithm ContentEncryptionAlgorithmIdentifier,
* encryptedContent [0] IMPLICIT EncryptedContent OPTIONAL
* }
*
* EncryptedContent ::= OCTET STRING
* </pre>
*/
public class EncryptedData
: Asn1Encodable
{
private readonly Asn1Sequence data;
// private readonly DerObjectIdentifier bagId;
// private readonly Asn1Object bagValue;
public static EncryptedData GetInstance(
object obj)
{
if (obj is EncryptedData)
{
return (EncryptedData) obj;
}
if (obj is Asn1Sequence)
{
return new EncryptedData((Asn1Sequence) obj);
}
throw new ArgumentException("Unknown object in factory: " + Platform.GetTypeName(obj), "obj");
}
private EncryptedData(
Asn1Sequence seq)
{
if (seq.Count != 2)
throw new ArgumentException("Wrong number of elements in sequence", "seq");
int version = ((DerInteger)seq[0]).IntValueExact;
if (version != 0)
{
throw new ArgumentException("sequence not version 0");
}
this.data = (Asn1Sequence) seq[1];
}
public EncryptedData(
DerObjectIdentifier contentType,
AlgorithmIdentifier encryptionAlgorithm,
Asn1Encodable content)
{
data = new BerSequence(
contentType,
encryptionAlgorithm.ToAsn1Object(),
new BerTaggedObject(false, 0, content));
}
public DerObjectIdentifier ContentType
{
get { return (DerObjectIdentifier) data[0]; }
}
public AlgorithmIdentifier EncryptionAlgorithm
{
get { return AlgorithmIdentifier.GetInstance(data[1]); }
}
public Asn1OctetString Content
{
get
{
if (data.Count == 3)
{
DerTaggedObject o = (DerTaggedObject) data[2];
return Asn1OctetString.GetInstance(o, false);
}
return null;
}
}
public override Asn1Object ToAsn1Object()
{
return new BerSequence(new DerInteger(0), data);
}
}
}
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