1 files changed, 182 insertions, 0 deletions
diff --git a/Crypto/src/asn1/cms/AuthenticatedDataParser.cs b/Crypto/src/asn1/cms/AuthenticatedDataParser.cs
new file mode 100644
index 000000000..4b80d1b02
--- /dev/null
+++ b/Crypto/src/asn1/cms/AuthenticatedDataParser.cs
@@ -0,0 +1,182 @@
+using System;
+
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.Cms
+{
+	/**
+	 * Produce an object suitable for an Asn1OutputStream.
+	 * <pre>
+	 * AuthenticatedData ::= SEQUENCE {
+	 *       version CMSVersion,
+	 *       originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
+	 *       recipientInfos RecipientInfos,
+	 *       macAlgorithm MessageAuthenticationCodeAlgorithm,
+	 *       digestAlgorithm [1] DigestAlgorithmIdentifier OPTIONAL,
+	 *       encapContentInfo EncapsulatedContentInfo,
+	 *       authAttrs [2] IMPLICIT AuthAttributes OPTIONAL,
+	 *       mac MessageAuthenticationCode,
+	 *       unauthAttrs [3] IMPLICIT UnauthAttributes OPTIONAL }
+	 *
+	 * AuthAttributes ::= SET SIZE (1..MAX) OF Attribute
+	 *
+	 * UnauthAttributes ::= SET SIZE (1..MAX) OF Attribute
+	 *
+	 * MessageAuthenticationCode ::= OCTET STRING
+	 * </pre>
+	 */
+	public class AuthenticatedDataParser
+	{
+	    private Asn1SequenceParser	seq;
+	    private DerInteger			version;
+	    private IAsn1Convertible	nextObject;
+	    private bool				originatorInfoCalled;
+
+	    public AuthenticatedDataParser(
+	        Asn1SequenceParser	seq)
+	    {
+	        this.seq = seq;
+	        this.version = (DerInteger)seq.ReadObject();
+	    }
+
+	    public DerInteger Version
+	    {
+	        get { return version; }
+	    }
+
+	    public OriginatorInfo GetOriginatorInfo()
+	    {
+	        originatorInfoCalled = true;
+
+	        if (nextObject == null)
+	        {
+	            nextObject = seq.ReadObject();
+	        }
+
+	        if (nextObject is Asn1TaggedObjectParser && ((Asn1TaggedObjectParser)nextObject).TagNo == 0)
+	        {
+	            Asn1SequenceParser originatorInfo = (Asn1SequenceParser) ((Asn1TaggedObjectParser)nextObject).GetObjectParser(Asn1Tags.Sequence, false);
+	            nextObject = null;
+	            return OriginatorInfo.GetInstance(originatorInfo.ToAsn1Object());
+	        }
+
+	        return null;
+	    }
+
+	    public Asn1SetParser GetRecipientInfos()
+	    {
+	        if (!originatorInfoCalled)
+	        {
+	            GetOriginatorInfo();
+	        }
+
+	        if (nextObject == null)
+	        {
+	            nextObject = seq.ReadObject();
+	        }
+
+	        Asn1SetParser recipientInfos = (Asn1SetParser)nextObject;
+	        nextObject = null;
+	        return recipientInfos;
+	    }
+
+	    public AlgorithmIdentifier GetMacAlgorithm()
+	    {
+	        if (nextObject == null)
+	        {
+	            nextObject = seq.ReadObject();
+	        }
+
+	        if (nextObject != null)
+	        {
+	            Asn1SequenceParser o = (Asn1SequenceParser)nextObject;
+	            nextObject = null;
+	            return AlgorithmIdentifier.GetInstance(o.ToAsn1Object());
+	        }
+
+	        return null;
+	    }
+
+		public AlgorithmIdentifier GetDigestAlgorithm()
+		{
+			if (nextObject == null)
+			{
+				nextObject = seq.ReadObject();
+			}
+
+			if (nextObject is Asn1TaggedObjectParser)
+			{
+				AlgorithmIdentifier obj = AlgorithmIdentifier.GetInstance(
+					(Asn1TaggedObject)nextObject.ToAsn1Object(), false);
+				nextObject = null;
+				return obj;
+			}
+
+			return null;
+		}
+
+	    public ContentInfoParser GetEnapsulatedContentInfo()
+	    {
+	        if (nextObject == null)
+	        {
+	            nextObject = seq.ReadObject();
+	        }
+
+	        if (nextObject != null)
+	        {
+	            Asn1SequenceParser o = (Asn1SequenceParser)nextObject;
+	            nextObject = null;
+	            return new ContentInfoParser(o);
+	        }
+
+	        return null;
+	    }
+
+	    public Asn1SetParser GetAuthAttrs()
+	    {
+	        if (nextObject == null)
+	        {
+	            nextObject = seq.ReadObject();
+	        }
+
+	        if (nextObject is Asn1TaggedObjectParser)
+	        {
+	            IAsn1Convertible o = nextObject;
+	            nextObject = null;
+	            return (Asn1SetParser)((Asn1TaggedObjectParser)o).GetObjectParser(Asn1Tags.Set, false);
+	        }
+
+	        return null;
+	    }
+
+	    public Asn1OctetString GetMac()
+	    {
+	        if (nextObject == null)
+	        {
+	            nextObject = seq.ReadObject();
+	        }
+
+	        IAsn1Convertible o = nextObject;
+	        nextObject = null;
+
+	        return Asn1OctetString.GetInstance(o.ToAsn1Object());
+	    }
+
+	    public Asn1SetParser GetUnauthAttrs()
+	    {
+	        if (nextObject == null)
+	        {
+	            nextObject = seq.ReadObject();
+	        }
+
+	        if (nextObject != null)
+	        {
+	            IAsn1Convertible o = nextObject;
+	            nextObject = null;
+	            return (Asn1SetParser)((Asn1TaggedObjectParser)o).GetObjectParser(Asn1Tags.Set, false);
+	        }
+
+	        return null;
+	    }
+	}
+}