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using System;
namespace Org.BouncyCastle.Asn1.Cms
{
public class EncryptedData
: Asn1Encodable
{
public static EncryptedData GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is EncryptedData encryptedData)
return encryptedData;
return new EncryptedData(Asn1Sequence.GetInstance(obj));
}
public static EncryptedData GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new EncryptedData(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
}
private readonly DerInteger m_version;
private readonly EncryptedContentInfo m_encryptedContentInfo;
private readonly Asn1Set m_unprotectedAttrs;
public EncryptedData(EncryptedContentInfo encInfo)
: this(encInfo, null)
{
}
public EncryptedData(EncryptedContentInfo encInfo, Asn1Set unprotectedAttrs)
{
m_version = unprotectedAttrs == null ? DerInteger.Zero : DerInteger.Two;
m_encryptedContentInfo = encInfo ?? throw new ArgumentNullException(nameof(encInfo));
m_unprotectedAttrs = unprotectedAttrs;
}
private EncryptedData(Asn1Sequence seq)
{
int count = seq.Count, pos = 0;
if (count < 2 || count > 3)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
m_version = DerInteger.GetInstance(seq[pos++]);
m_encryptedContentInfo = EncryptedContentInfo.GetInstance(seq[pos++]);
m_unprotectedAttrs = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 1, false, Asn1Set.GetInstance);
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
}
public virtual DerInteger Version => m_version;
public virtual EncryptedContentInfo EncryptedContentInfo => m_encryptedContentInfo;
public virtual Asn1Set UnprotectedAttrs => m_unprotectedAttrs;
/**
* <pre>
* EncryptedData ::= SEQUENCE {
* version CMSVersion,
* encryptedContentInfo EncryptedContentInfo,
* unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL }
* </pre>
* @return a basic ASN.1 object representation.
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(3);
v.Add(m_version, m_encryptedContentInfo);
if (m_unprotectedAttrs != null)
{
v.Add(new BerTaggedObject(false, 1, m_unprotectedAttrs));
}
return new BerSequence(v);
}
}
}
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