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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 X509CrlParser
{
private static readonly PemParser PemCrlParser = new PemParser("CRL");
private readonly bool lazyAsn1;
private Asn1Set sCrlData;
private int sCrlDataObjectCount;
private Stream currentCrlStream;
public X509CrlParser()
: this(false)
{
}
public X509CrlParser(
bool lazyAsn1)
{
this.lazyAsn1 = lazyAsn1;
}
private X509Crl ReadPemCrl(
Stream inStream)
{
Asn1Sequence seq = PemCrlParser.ReadPemObject(inStream);
return seq == null
? null
: CreateX509Crl(CertificateList.GetInstance(seq));
}
private X509Crl ReadDerCrl(
Asn1InputStream dIn)
{
Asn1Sequence seq = (Asn1Sequence)dIn.ReadObject();
if (seq.Count > 1 && seq[0] is DerObjectIdentifier)
{
if (seq[0].Equals(PkcsObjectIdentifiers.SignedData))
{
sCrlData = SignedData.GetInstance(
Asn1Sequence.GetInstance((Asn1TaggedObject) seq[1], true)).Crls;
return GetCrl();
}
}
return CreateX509Crl(CertificateList.GetInstance(seq));
}
private X509Crl GetCrl()
{
if (sCrlData == null || sCrlDataObjectCount >= sCrlData.Count)
{
return null;
}
return CreateX509Crl(
CertificateList.GetInstance(
sCrlData[sCrlDataObjectCount++]));
}
protected virtual X509Crl CreateX509Crl(
CertificateList c)
{
return new X509Crl(c);
}
/// <summary>
/// Create loading data from byte array.
/// </summary>
/// <param name="input"></param>
public X509Crl ReadCrl(
byte[] input)
{
return ReadCrl(new MemoryStream(input, false));
}
/// <summary>
/// Create loading data from byte array.
/// </summary>
/// <param name="input"></param>
public ICollection ReadCrls(
byte[] input)
{
return ReadCrls(new MemoryStream(input, false));
}
/**
* Generates a certificate revocation list (CRL) object and initializes
* it with the data read from the input stream inStream.
*/
public X509Crl ReadCrl(
Stream inStream)
{
if (inStream == null)
throw new ArgumentNullException("inStream");
if (!inStream.CanRead)
throw new ArgumentException("inStream must be read-able", "inStream");
if (currentCrlStream == null)
{
currentCrlStream = inStream;
sCrlData = null;
sCrlDataObjectCount = 0;
}
else if (currentCrlStream != inStream) // reset if input stream has changed
{
currentCrlStream = inStream;
sCrlData = null;
sCrlDataObjectCount = 0;
}
try
{
if (sCrlData != null)
{
if (sCrlDataObjectCount != sCrlData.Count)
{
return GetCrl();
}
sCrlData = null;
sCrlDataObjectCount = 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 ReadPemCrl(inStream);
}
Asn1InputStream asn1 = lazyAsn1
? new LazyAsn1InputStream(inStream)
: new Asn1InputStream(inStream);
return ReadDerCrl(asn1);
}
catch (CrlException e)
{
throw e;
}
catch (Exception e)
{
throw new CrlException(e.ToString());
}
}
/**
* Returns a (possibly empty) collection view of the CRLs read from
* the given input stream inStream.
*
* The inStream may contain a sequence of DER-encoded CRLs, or
* a PKCS#7 CRL set. This is a PKCS#7 SignedData object, with the
* only significant field being crls. In particular the signature
* and the contents are ignored.
*/
public ICollection ReadCrls(
Stream inStream)
{
X509Crl crl;
IList crls = Platform.CreateArrayList();
while ((crl = ReadCrl(inStream)) != null)
{
crls.Add(crl);
}
return crls;
}
}
}
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