Initial Commit

iTechSharp/srcbc/asn1/x509/ObjectDigestInfo.cs

@@ -0,0 +1,177 @@
+using System;
+
+namespace Org.BouncyCastle.Asn1.X509
+{
+	/**
+	 * ObjectDigestInfo ASN.1 structure used in v2 attribute certificates.
+	 * 
+	 * <pre>
+	 *  
+	 *    ObjectDigestInfo ::= SEQUENCE {
+	 *         digestedObjectType  ENUMERATED {
+	 *                 publicKey            (0),
+	 *                 publicKeyCert        (1),
+	 *                 otherObjectTypes     (2) },
+	 *                         -- otherObjectTypes MUST NOT
+	 *                         -- be used in this profile
+	 *         otherObjectTypeID   OBJECT IDENTIFIER OPTIONAL,
+	 *         digestAlgorithm     AlgorithmIdentifier,
+	 *         objectDigest        BIT STRING
+	 *    }
+	 *   
+	 * </pre>
+	 * 
+	 */
+	public class ObjectDigestInfo
+        : Asn1Encodable
+    {
+		/**
+		 * The public key is hashed.
+		 */
+		public const int PublicKey = 0;
+
+		/**
+		 * The public key certificate is hashed.
+		 */
+		public const int PublicKeyCert = 1;
+
+		/**
+		 * An other object is hashed.
+		 */
+		public const int OtherObjectDigest = 2;
+
+		internal readonly DerEnumerated			digestedObjectType;
+        internal readonly DerObjectIdentifier	otherObjectTypeID;
+        internal readonly AlgorithmIdentifier	digestAlgorithm;
+        internal readonly DerBitString			objectDigest;
+
+		public static ObjectDigestInfo GetInstance(
+            object obj)
+        {
+            if (obj == null || obj is ObjectDigestInfo)
+            {
+                return (ObjectDigestInfo) obj;
+            }
+
+			if (obj is Asn1Sequence)
+            {
+                return new ObjectDigestInfo((Asn1Sequence) obj);
+            }
+
+			throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
+		}
+
+		public static ObjectDigestInfo GetInstance(
+            Asn1TaggedObject	obj,
+            bool				isExplicit)
+        {
+            return GetInstance(Asn1Sequence.GetInstance(obj, isExplicit));
+        }
+
+		/**
+		 * Constructor from given details.
+		 * <p>
+		 * If <code>digestedObjectType</code> is not {@link #publicKeyCert} or
+		 * {@link #publicKey} <code>otherObjectTypeID</code> must be given,
+		 * otherwise it is ignored.</p>
+		 * 
+		 * @param digestedObjectType The digest object type.
+		 * @param otherObjectTypeID The object type ID for
+		 *            <code>otherObjectDigest</code>.
+		 * @param digestAlgorithm The algorithm identifier for the hash.
+		 * @param objectDigest The hash value.
+		 */
+		public ObjectDigestInfo(
+			int					digestedObjectType,
+			string				otherObjectTypeID,
+			AlgorithmIdentifier	digestAlgorithm,
+			byte[]				objectDigest)
+		{
+			this.digestedObjectType = new DerEnumerated(digestedObjectType);
+
+			if (digestedObjectType == OtherObjectDigest)
+			{
+				this.otherObjectTypeID = new DerObjectIdentifier(otherObjectTypeID);
+			}
+
+			this.digestAlgorithm = digestAlgorithm; 
+
+			this.objectDigest = new DerBitString(objectDigest);
+		}
+
+		private ObjectDigestInfo(
+			Asn1Sequence seq)
+        {
+			if (seq.Count > 4 || seq.Count < 3)
+			{
+				throw new ArgumentException("Bad sequence size: " + seq.Count);
+			}
+
+			digestedObjectType = DerEnumerated.GetInstance(seq[0]);
+
+			int offset = 0;
+
+			if (seq.Count == 4)
+            {
+                otherObjectTypeID = DerObjectIdentifier.GetInstance(seq[1]);
+                offset++;
+            }
+
+			digestAlgorithm = AlgorithmIdentifier.GetInstance(seq[1 + offset]);
+			objectDigest = DerBitString.GetInstance(seq[2 + offset]);
+		}
+
+		public DerEnumerated DigestedObjectType
+		{
+			get { return digestedObjectType; }
+		}
+
+		public DerObjectIdentifier OtherObjectTypeID
+		{
+			get { return otherObjectTypeID; }
+		}
+
+		public AlgorithmIdentifier DigestAlgorithm
+		{
+			get { return digestAlgorithm; }
+		}
+
+		public DerBitString ObjectDigest
+		{
+			get { return objectDigest; }
+		}
+
+		/**
+		 * Produce an object suitable for an Asn1OutputStream.
+		 * 
+		 * <pre>
+		 *  
+		 *    ObjectDigestInfo ::= SEQUENCE {
+		 *         digestedObjectType  ENUMERATED {
+		 *                 publicKey            (0),
+		 *                 publicKeyCert        (1),
+		 *                 otherObjectTypes     (2) },
+		 *                         -- otherObjectTypes MUST NOT
+		 *                         -- be used in this profile
+		 *         otherObjectTypeID   OBJECT IDENTIFIER OPTIONAL,
+		 *         digestAlgorithm     AlgorithmIdentifier,
+		 *         objectDigest        BIT STRING
+		 *    }
+		 *   
+		 * </pre>
+		 */
+		public override Asn1Object ToAsn1Object()
+        {
+            Asn1EncodableVector v = new Asn1EncodableVector(digestedObjectType);
+
+			if (otherObjectTypeID != null)
+            {
+                v.Add(otherObjectTypeID);
+            }
+
+			v.Add(digestAlgorithm, objectDigest);
+
+			return new DerSequence(v);
+        }
+    }
+}