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using System;
namespace Org.BouncyCastle.Asn1.Cms
{
/**
* a signed data object.
*/
public class SignedData
: Asn1Encodable
{
private static readonly DerInteger Version1 = new DerInteger(1);
private static readonly DerInteger Version3 = new DerInteger(3);
private static readonly DerInteger Version4 = new DerInteger(4);
private static readonly DerInteger Version5 = new DerInteger(5);
private readonly DerInteger version;
private readonly Asn1Set digestAlgorithms;
private readonly ContentInfo contentInfo;
private readonly Asn1Set certificates;
private readonly Asn1Set crls;
private readonly Asn1Set signerInfos;
private readonly bool certsBer;
private readonly bool crlsBer;
public static SignedData GetInstance(object obj)
{
if (obj is SignedData)
return (SignedData)obj;
if (obj == null)
return null;
return new SignedData(Asn1Sequence.GetInstance(obj));
}
public SignedData(
Asn1Set digestAlgorithms,
ContentInfo contentInfo,
Asn1Set certificates,
Asn1Set crls,
Asn1Set signerInfos)
{
this.version = CalculateVersion(contentInfo.ContentType, certificates, crls, signerInfos);
this.digestAlgorithms = digestAlgorithms;
this.contentInfo = contentInfo;
this.certificates = certificates;
this.crls = crls;
this.signerInfos = signerInfos;
this.crlsBer = crls is BerSet;
this.certsBer = certificates is BerSet;
}
// RFC3852, section 5.1:
// IF ((certificates is present) AND
// (any certificates with a type of other are present)) OR
// ((crls is present) AND
// (any crls with a type of other are present))
// THEN version MUST be 5
// ELSE
// IF (certificates is present) AND
// (any version 2 attribute certificates are present)
// THEN version MUST be 4
// ELSE
// IF ((certificates is present) AND
// (any version 1 attribute certificates are present)) OR
// (any SignerInfo structures are version 3) OR
// (encapContentInfo eContentType is other than id-data)
// THEN version MUST be 3
// ELSE version MUST be 1
//
private DerInteger CalculateVersion(
DerObjectIdentifier contentOid,
Asn1Set certs,
Asn1Set crls,
Asn1Set signerInfs)
{
bool otherCert = false;
bool otherCrl = false;
bool attrCertV1Found = false;
bool attrCertV2Found = false;
if (certs != null)
{
foreach (object obj in certs)
{
if (obj is Asn1TaggedObject)
{
Asn1TaggedObject tagged = (Asn1TaggedObject)obj;
if (tagged.TagNo == 1)
{
attrCertV1Found = true;
}
else if (tagged.TagNo == 2)
{
attrCertV2Found = true;
}
else if (tagged.TagNo == 3)
{
otherCert = true;
break;
}
}
}
}
if (otherCert)
{
return Version5;
}
if (crls != null)
{
foreach (object obj in crls)
{
if (obj is Asn1TaggedObject)
{
otherCrl = true;
break;
}
}
}
if (otherCrl)
{
return Version5;
}
if (attrCertV2Found)
{
return Version4;
}
if (attrCertV1Found || !CmsObjectIdentifiers.Data.Equals(contentOid) || CheckForVersion3(signerInfs))
{
return Version3;
}
return Version1;
}
private bool CheckForVersion3(Asn1Set signerInfs)
{
foreach (object obj in signerInfs)
{
SignerInfo s = SignerInfo.GetInstance(obj);
if (s.Version.HasValue(3))
{
return true;
}
}
return false;
}
private SignedData(Asn1Sequence seq)
{
var e = seq.GetEnumerator();
e.MoveNext();
version = (DerInteger)e.Current;
e.MoveNext();
digestAlgorithms = (Asn1Set)e.Current.ToAsn1Object();
e.MoveNext();
contentInfo = ContentInfo.GetInstance(e.Current.ToAsn1Object());
while (e.MoveNext())
{
Asn1Object o = e.Current.ToAsn1Object();
//
// an interesting feature of SignedData is that there appear
// to be varying implementations...
// for the moment we ignore anything which doesn't fit.
//
if (o is Asn1TaggedObject tagged)
{
switch (tagged.TagNo)
{
case 0:
certsBer = tagged is BerTaggedObject;
certificates = Asn1Set.GetInstance(tagged, false);
break;
case 1:
crlsBer = tagged is BerTaggedObject;
crls = Asn1Set.GetInstance(tagged, false);
break;
default:
throw new ArgumentException("unknown tag value " + tagged.TagNo);
}
}
else
{
signerInfos = (Asn1Set) o;
}
}
}
public DerInteger Version
{
get { return version; }
}
public Asn1Set DigestAlgorithms
{
get { return digestAlgorithms; }
}
public ContentInfo EncapContentInfo
{
get { return contentInfo; }
}
public Asn1Set Certificates
{
get { return certificates; }
}
public Asn1Set CRLs
{
get { return crls; }
}
public Asn1Set SignerInfos
{
get { return signerInfos; }
}
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* SignedData ::= Sequence {
* version CMSVersion,
* digestAlgorithms DigestAlgorithmIdentifiers,
* encapContentInfo EncapsulatedContentInfo,
* certificates [0] IMPLICIT CertificateSet OPTIONAL,
* crls [1] IMPLICIT CertificateRevocationLists OPTIONAL,
* signerInfos SignerInfos
* }
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(
version, digestAlgorithms, contentInfo);
if (certificates != null)
{
if (certsBer)
{
v.Add(new BerTaggedObject(false, 0, certificates));
}
else
{
v.Add(new DerTaggedObject(false, 0, certificates));
}
}
if (crls != null)
{
if (crlsBer)
{
v.Add(new BerTaggedObject(false, 1, crls));
}
else
{
v.Add(new DerTaggedObject(false, 1, crls));
}
}
v.Add(signerInfos);
return new BerSequence(v);
}
}
}
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