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using System;
using System.Collections;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Security.Certificates;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.X509
{
public class X509AttrCertParser
{
private static readonly PemParser PemAttrCertParser = new PemParser("ATTRIBUTE CERTIFICATE");
private Asn1Set sData;
private int sDataObjectCount;
private Stream currentStream;
private IX509AttributeCertificate ReadDerCertificate(
Asn1InputStream dIn)
{
Asn1Sequence seq = (Asn1Sequence)dIn.ReadObject();
if (seq.Count > 1 && seq[0] is DerObjectIdentifier)
{
if (seq[0].Equals(PkcsObjectIdentifiers.SignedData))
{
sData = SignedData.GetInstance(
Asn1Sequence.GetInstance((Asn1TaggedObject) seq[1], true)).Certificates;
return GetCertificate();
}
}
// return new X509V2AttributeCertificate(seq.getEncoded());
return new X509V2AttributeCertificate(AttributeCertificate.GetInstance(seq));
}
private IX509AttributeCertificate GetCertificate()
{
if (sData != null)
{
while (sDataObjectCount < sData.Count)
{
object obj = sData[sDataObjectCount++];
if (obj is Asn1TaggedObject && ((Asn1TaggedObject)obj).TagNo == 2)
{
//return new X509V2AttributeCertificate(
// Asn1Sequence.GetInstance((Asn1TaggedObject)obj, false).GetEncoded());
return new X509V2AttributeCertificate(
AttributeCertificate.GetInstance(
Asn1Sequence.GetInstance((Asn1TaggedObject)obj, false)));
}
}
}
return null;
}
private IX509AttributeCertificate ReadPemCertificate(
Stream inStream)
{
Asn1Sequence seq = PemAttrCertParser.ReadPemObject(inStream);
return seq == null
? null
//: new X509V2AttributeCertificate(seq.getEncoded());
: new X509V2AttributeCertificate(AttributeCertificate.GetInstance(seq));
}
/// <summary>
/// Create loading data from byte array.
/// </summary>
/// <param name="input"></param>
public IX509AttributeCertificate ReadAttrCert(
byte[] input)
{
return ReadAttrCert(new MemoryStream(input, false));
}
/// <summary>
/// Create loading data from byte array.
/// </summary>
/// <param name="input"></param>
public ICollection ReadAttrCerts(
byte[] input)
{
return ReadAttrCerts(new MemoryStream(input, false));
}
/**
* Generates a certificate object and initializes it with the data
* read from the input stream inStream.
*/
public IX509AttributeCertificate ReadAttrCert(
Stream inStream)
{
if (inStream == null)
throw new ArgumentNullException("inStream");
if (!inStream.CanRead)
throw new ArgumentException("inStream must be read-able", "inStream");
if (currentStream == null)
{
currentStream = inStream;
sData = null;
sDataObjectCount = 0;
}
else if (currentStream != inStream) // reset if input stream has changed
{
currentStream = inStream;
sData = null;
sDataObjectCount = 0;
}
try
{
if (sData != null)
{
if (sDataObjectCount != sData.Count)
{
return GetCertificate();
}
sData = null;
sDataObjectCount = 0;
return null;
}
PushbackStream pis = new PushbackStream(inStream);
int tag = pis.ReadByte();
if (tag < 0)
return null;
pis.Unread(tag);
if (tag != 0x30) // assume ascii PEM encoded.
{
return ReadPemCertificate(pis);
}
return ReadDerCertificate(new Asn1InputStream(pis));
}
catch (Exception e)
{
throw new CertificateException(e.ToString());
}
}
/**
* Returns a (possibly empty) collection view of the certificates
* read from the given input stream inStream.
*/
public ICollection ReadAttrCerts(
Stream inStream)
{
IX509AttributeCertificate attrCert;
IList attrCerts = Platform.CreateArrayList();
while ((attrCert = ReadAttrCert(inStream)) != null)
{
attrCerts.Add(attrCert);
}
return attrCerts;
}
}
}
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