X509Certificate parseCertificate()
{
if (sData != null && sDataObjectCount != sData.getCertificates().size())
{
return(new X509Certificate(
ASN1Sequence.getInstance(
sData.getCertificates().getObjectAt(sDataObjectCount++))));
}
sData = null;
sDataObjectCount = 0;
long pos = inStr.Position;
int tag = inStr.ReadByte();
if (tag == -1)
{
return(null);
}
if (tag != 0x30) // assume ascii PEM encoded.
{
inStr.Seek(pos, SeekOrigin.Begin);
return(readPEMCertificate());
}
else if (inStr.ReadByte() == 0x80) // assume BER encoded.
{
inStr.Seek(pos, SeekOrigin.Begin);
return(readPKCS7Certificate());
}
else
{
inStr.Seek(pos, SeekOrigin.Begin);
return(readDERCertificate(inStr));
}
}
private X509Certificate readPKCS7Certificate()
{
ASN1InputStream dIn = new ASN1InputStream(inStr);
ASN1Sequence seq = (ASN1Sequence)dIn.readObject();
if (seq.size() > 1 && seq.getObjectAt(0) is DERObjectIdentifier)
{
if (seq.getObjectAt(0).Equals(PKCSObjectIdentifiers.signedData))
{
sData = new SignedData(ASN1Sequence.getInstance((ASN1TaggedObject)seq.getObjectAt(1), true));
return(new X509Certificate(ASN1Sequence.getInstance(sData.getCertificates().getObjectAt(sDataObjectCount++))));
}
}
return(new X509Certificate(ASN1Sequence.getInstance(seq)));
}