1 files changed, 195 insertions, 0 deletions
diff --git a/Crypto/src/x509/X509CrlParser.cs b/Crypto/src/x509/X509CrlParser.cs
new file mode 100644
index 000000000..d830bb9a6
--- /dev/null
+++ b/Crypto/src/x509/X509CrlParser.cs
@@ -0,0 +1,195 @@
+using System;
+using System.Collections;
+using System.IO;
+using System.Text;
+
+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.Encoders;
+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;
+ }
+
+ 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 ReadPemCrl(pis);
+ }
+
+ Asn1InputStream asn1 = lazyAsn1
+ ? new LazyAsn1InputStream(pis)
+ : new Asn1InputStream(pis);
+
+ 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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