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using System;
namespace Org.BouncyCastle.Asn1.Cms
{
public class AuthEnvelopedData
: Asn1Encodable
{
public static AuthEnvelopedData GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is AuthEnvelopedData authEnvelopedData)
return authEnvelopedData;
return new AuthEnvelopedData(Asn1Sequence.GetInstance(obj));
}
public static AuthEnvelopedData GetInstance(Asn1TaggedObject obj, bool isExplicit)
{
return new AuthEnvelopedData(Asn1Sequence.GetInstance(obj, isExplicit));
}
private DerInteger version;
private OriginatorInfo originatorInfo;
private Asn1Set recipientInfos;
private EncryptedContentInfo authEncryptedContentInfo;
private Asn1Set authAttrs;
private Asn1OctetString mac;
private Asn1Set unauthAttrs;
public AuthEnvelopedData(
OriginatorInfo originatorInfo,
Asn1Set recipientInfos,
EncryptedContentInfo authEncryptedContentInfo,
Asn1Set authAttrs,
Asn1OctetString mac,
Asn1Set unauthAttrs)
{
// "It MUST be set to 0."
this.version = new DerInteger(0);
this.originatorInfo = originatorInfo;
// "There MUST be at least one element in the collection."
this.recipientInfos = recipientInfos;
if (this.recipientInfos.Count < 1)
throw new ArgumentException("AuthEnvelopedData requires at least 1 RecipientInfo");
this.authEncryptedContentInfo = authEncryptedContentInfo;
// "The authAttrs MUST be present if the content type carried in
// EncryptedContentInfo is not id-data."
this.authAttrs = authAttrs;
if (!authEncryptedContentInfo.ContentType.Equals(CmsObjectIdentifiers.Data))
{
if (authAttrs == null || authAttrs.Count < 1)
throw new ArgumentException("authAttrs must be present with non-data content");
}
this.mac = mac;
this.unauthAttrs = unauthAttrs;
}
private AuthEnvelopedData(Asn1Sequence seq)
{
int index = 0;
// "It MUST be set to 0."
Asn1Object tmp = seq[index++].ToAsn1Object();
version = DerInteger.GetInstance(tmp);
if (!version.HasValue(0))
throw new ArgumentException("AuthEnvelopedData version number must be 0");
tmp = seq[index++].ToAsn1Object();
if (tmp is Asn1TaggedObject taggedObject1)
{
originatorInfo = OriginatorInfo.GetInstance(taggedObject1, false);
tmp = seq[index++].ToAsn1Object();
}
// "There MUST be at least one element in the collection."
recipientInfos = Asn1Set.GetInstance(tmp);
if (recipientInfos.Count < 1)
throw new ArgumentException("AuthEnvelopedData requires at least 1 RecipientInfo");
tmp = seq[index++].ToAsn1Object();
authEncryptedContentInfo = EncryptedContentInfo.GetInstance(tmp);
tmp = seq[index++].ToAsn1Object();
if (tmp is Asn1TaggedObject taggedObject2)
{
authAttrs = Asn1Set.GetInstance(taggedObject2, false);
tmp = seq[index++].ToAsn1Object();
}
else
{
// "The authAttrs MUST be present if the content type carried in
// EncryptedContentInfo is not id-data."
if (!authEncryptedContentInfo.ContentType.Equals(CmsObjectIdentifiers.Data))
{
if (authAttrs == null || authAttrs.Count < 1)
throw new ArgumentException("authAttrs must be present with non-data content");
}
}
mac = Asn1OctetString.GetInstance(tmp);
if (seq.Count > index)
{
tmp = seq[index++].ToAsn1Object();
unauthAttrs = Asn1Set.GetInstance((Asn1TaggedObject)tmp, false);
}
}
public DerInteger Version
{
get { return version; }
}
public OriginatorInfo OriginatorInfo
{
get { return originatorInfo; }
}
public Asn1Set RecipientInfos
{
get { return recipientInfos; }
}
public EncryptedContentInfo AuthEncryptedContentInfo
{
get { return authEncryptedContentInfo; }
}
public Asn1Set AuthAttrs
{
get { return authAttrs; }
}
public Asn1OctetString Mac
{
get { return mac; }
}
public Asn1Set UnauthAttrs
{
get { return unauthAttrs; }
}
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* AuthEnvelopedData ::= SEQUENCE {
* version CMSVersion,
* originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
* recipientInfos RecipientInfos,
* authEncryptedContentInfo EncryptedContentInfo,
* authAttrs [1] IMPLICIT AuthAttributes OPTIONAL,
* mac MessageAuthenticationCode,
* unauthAttrs [2] IMPLICIT UnauthAttributes OPTIONAL }
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(version);
v.AddOptionalTagged(false, 0, originatorInfo);
v.Add(recipientInfos, authEncryptedContentInfo);
// "authAttrs optionally contains the authenticated attributes."
// "AuthAttributes MUST be DER encoded, even if the rest of the
// AuthEnvelopedData structure is BER encoded."
v.AddOptionalTagged(false, 1, authAttrs);
v.Add(mac);
// "unauthAttrs optionally contains the unauthenticated attributes."
v.AddOptionalTagged(false, 2, unauthAttrs);
return new BerSequence(v);
}
}
}
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