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using System;
using System.Collections.Generic;
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.IO;
namespace Org.BouncyCastle.X509
{
/**
* class for dealing with X509 certificates.
* <p>
* At the moment this will deal with "-----BEGIN CERTIFICATE-----" to "-----END CERTIFICATE-----"
* base 64 encoded certs, as well as the BER binaries of certificates and some classes of PKCS#7
* objects.</p>
*/
public class X509CertificateParser
{
private static readonly PemParser PemCertParser = new PemParser("CERTIFICATE");
private Asn1Set sData;
private int sDataObjectCount;
private Stream currentStream;
private X509Certificate 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 X509Certificate(X509CertificateStructure.GetInstance(seq));
}
private X509Certificate ReadPemCertificate(Stream inStream)
{
Asn1Sequence seq = PemCertParser.ReadPemObject(inStream);
return seq == null ? null : new X509Certificate(X509CertificateStructure.GetInstance(seq));
}
private X509Certificate GetCertificate()
{
if (sData != null)
{
while (sDataObjectCount < sData.Count)
{
object obj = sData[sDataObjectCount++];
if (obj is Asn1Sequence)
return new X509Certificate(X509CertificateStructure.GetInstance(obj));
}
}
return null;
}
/// <summary>
/// Create loading data from byte array.
/// </summary>
/// <param name="input"></param>
public X509Certificate ReadCertificate(byte[] input)
{
return ReadCertificate(new MemoryStream(input, false));
}
/// <summary>
/// Create loading data from byte array.
/// </summary>
/// <param name="input"></param>
public IList<X509Certificate> ReadCertificates(byte[] input)
{
return ReadCertificates(new MemoryStream(input, false));
}
/**
* Generates a certificate object and initializes it with the data
* read from the input stream inStream.
*/
public X509Certificate ReadCertificate(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;
}
int tag = inStream.ReadByte();
if (tag < 0)
return null;
if (inStream.CanSeek)
{
inStream.Seek(-1L, SeekOrigin.Current);
}
else
{
PushbackStream pis = new PushbackStream(inStream);
pis.Unread(tag);
inStream = pis;
}
if (tag != 0x30) // assume ascii PEM encoded.
return ReadPemCertificate(inStream);
using (var asn1In = new Asn1InputStream(inStream, int.MaxValue, leaveOpen: true))
{
return ReadDerCertificate(asn1In);
}
}
catch (Exception e)
{
throw new CertificateException("Failed to read certificate", e);
}
}
/**
* Returns a (possibly empty) collection view of the certificates
* read from the given input stream inStream.
*/
public IList<X509Certificate> ReadCertificates(Stream inStream)
{
return new List<X509Certificate>(ParseCertificates(inStream));
}
public IEnumerable<X509Certificate> ParseCertificates(Stream inStream)
{
X509Certificate cert;
while ((cert = ReadCertificate(inStream)) != null)
{
yield return cert;
}
}
}
}
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