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using System;
namespace Org.BouncyCastle.Asn1.Cms
{
public class EnvelopedData
: Asn1Encodable
{
private DerInteger version;
private OriginatorInfo originatorInfo;
private Asn1Set recipientInfos;
private EncryptedContentInfo encryptedContentInfo;
private Asn1Set unprotectedAttrs;
public EnvelopedData(
OriginatorInfo originatorInfo,
Asn1Set recipientInfos,
EncryptedContentInfo encryptedContentInfo,
Asn1Set unprotectedAttrs)
{
this.version = new DerInteger(CalculateVersion(originatorInfo, recipientInfos, unprotectedAttrs));
this.originatorInfo = originatorInfo;
this.recipientInfos = recipientInfos;
this.encryptedContentInfo = encryptedContentInfo;
this.unprotectedAttrs = unprotectedAttrs;
}
public EnvelopedData(
OriginatorInfo originatorInfo,
Asn1Set recipientInfos,
EncryptedContentInfo encryptedContentInfo,
Attributes unprotectedAttrs)
{
this.version = new DerInteger(CalculateVersion(originatorInfo, recipientInfos, Asn1Set.GetInstance(unprotectedAttrs)));
this.originatorInfo = originatorInfo;
this.recipientInfos = recipientInfos;
this.encryptedContentInfo = encryptedContentInfo;
this.unprotectedAttrs = Asn1Set.GetInstance(unprotectedAttrs);
}
private EnvelopedData(Asn1Sequence seq)
{
int index = 0;
version = (DerInteger) seq[index++];
object tmp = seq[index++];
if (tmp is Asn1TaggedObject taggedObject)
{
originatorInfo = OriginatorInfo.GetInstance(taggedObject, false);
tmp = seq[index++];
}
recipientInfos = Asn1Set.GetInstance(tmp);
encryptedContentInfo = EncryptedContentInfo.GetInstance(seq[index++]);
if (seq.Count > index)
{
unprotectedAttrs = Asn1Set.GetInstance((Asn1TaggedObject)seq[index], false);
}
}
/**
* return an EnvelopedData 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 EnvelopedData GetInstance(
Asn1TaggedObject obj,
bool explicitly)
{
return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
}
/**
* return an EnvelopedData object from the given object.
*
* @param obj the object we want converted.
* @exception ArgumentException if the object cannot be converted.
*/
public static EnvelopedData GetInstance(
object obj)
{
if (obj is EnvelopedData)
return (EnvelopedData)obj;
if (obj == null)
return null;
return new EnvelopedData(Asn1Sequence.GetInstance(obj));
}
public DerInteger Version
{
get { return version; }
}
public OriginatorInfo OriginatorInfo
{
get { return originatorInfo; }
}
public Asn1Set RecipientInfos
{
get { return recipientInfos; }
}
public EncryptedContentInfo EncryptedContentInfo
{
get { return encryptedContentInfo; }
}
public Asn1Set UnprotectedAttrs
{
get { return unprotectedAttrs; }
}
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* EnvelopedData ::= Sequence {
* version CMSVersion,
* originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
* recipientInfos RecipientInfos,
* encryptedContentInfo EncryptedContentInfo,
* unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL
* }
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(version);
v.AddOptionalTagged(false, 0, originatorInfo);
v.Add(recipientInfos, encryptedContentInfo);
v.AddOptionalTagged(false, 1, unprotectedAttrs);
return new BerSequence(v);
}
public static int CalculateVersion(OriginatorInfo originatorInfo, Asn1Set recipientInfos, Asn1Set unprotectedAttrs)
{
if (originatorInfo != null || unprotectedAttrs != null)
{
return 2;
}
foreach (object o in recipientInfos)
{
RecipientInfo ri = RecipientInfo.GetInstance(o);
if (!ri.Version.HasValue(0))
{
return 2;
}
}
return 0;
}
}
}
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