public AttributeCertificateInfo(
ASN1Sequence seq)
{
this.version = DERInteger.getInstance(seq.getObjectAt(0));
this.holder = Holder.getInstance(seq.getObjectAt(1));
this.issuer = AttCertIssuer.getInstance(seq.getObjectAt(2));
this.signature = AlgorithmIdentifier.getInstance(seq.getObjectAt(3));
this.serialNumber = DERInteger.getInstance(seq.getObjectAt(4));
this.attrCertValidityPeriod = AttCertValidityPeriod.getInstance(seq.getObjectAt(5));
this.attributes = ASN1Sequence.getInstance(seq.getObjectAt(6));
for (int i = 7; i < seq.size(); i++)
{
ASN1Encodable obj = (ASN1Encodable)seq.getObjectAt(i);
if (obj is DERBitString)
{
this.issuerUniqueID = DERBitString.getInstance(seq.getObjectAt(i));
}
else if (obj is ASN1Sequence || obj is X509Extensions)
{
this.extensions = X509Extensions.getInstance(seq.getObjectAt(i));
}
}
}
public AttributeCertificate(
ASN1Sequence seq)
{
this.acinfo = AttributeCertificateInfo.getInstance(seq.getObjectAt(0));
this.signatureAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(1));
this.signatureValue = DERBitString.getInstance(seq.getObjectAt(2));
}
public TBSCertificateStructure(
ASN1Sequence seq)
{
int seqStart = 0;
this.seq = seq;
//
// some certficates don't include a version number - we assume v1
//
if (seq.getObjectAt(0) is DERTaggedObject)
{
version = DERInteger.getInstance(seq.getObjectAt(0));
}
else
{
seqStart = -1; // field 0 is missing!
version = new DERInteger(0);
}
serialNumber = DERInteger.getInstance(seq.getObjectAt(seqStart + 1));
signature = AlgorithmIdentifier.getInstance(seq.getObjectAt(seqStart + 2));
issuer = X509Name.getInstance(seq.getObjectAt(seqStart + 3));
//
// before and after dates
//
ASN1Sequence dates = (ASN1Sequence)seq.getObjectAt(seqStart + 4);
startDate = Time.getInstance(dates.getObjectAt(0));
endDate = Time.getInstance(dates.getObjectAt(1));
subject = X509Name.getInstance(seq.getObjectAt(seqStart + 5));
//
// public key info.
//
subjectPublicKeyInfo = SubjectPublicKeyInfo.getInstance(seq.getObjectAt(seqStart + 6));
for (int extras = seq.size() - (seqStart + 6) - 1; extras > 0; extras--)
{
DERTaggedObject extra = (DERTaggedObject)seq.getObjectAt(seqStart + 6 + extras);
switch ((int)extra.getTagNo())
{
case 1:
issuerUniqueId = DERBitString.getInstance(extra, false);
break;
case 2:
subjectUniqueId = DERBitString.getInstance(extra, false);
break;
case 3:
extensions = X509Extensions.getInstance(extra);
break;
}
}
}
/// <summary>
/// Get a key usage guidlines.
/// </summary>
/// <returns>A DER it string or null if they are not specified.</returns>
public KeyUsage getKeyUsage()
{
byte[] bytes = this.getExtensionBytes("2.5.29.15");
if (bytes != null)
{
try
{
ASN1InputStream dIn = new ASN1InputStream(new MemoryStream(bytes));
return(new KeyUsage(DERBitString.getInstance(dIn.readObject())));
}
catch
{
throw new Exception("error processing key usage extension");
}
}
return(null);
}
public DistributionPoint(
ASN1Sequence seq)
{
for (int i = 0; i != seq.size(); i++)
{
ASN1TaggedObject t = (ASN1TaggedObject)seq.getObjectAt(i);
switch ((int)t.getTagNo())
{
case 0:
distributionPoint = DistributionPointName.getInstance(t, true);
break;
case 1:
reasons = new ReasonFlags(DERBitString.getInstance(t, false));
break;
case 2:
cRLIssuer = GeneralNames.getInstance(t, false);
break;
}
}
}
