1 files changed, 92 insertions, 0 deletions
diff --git a/crypto/src/asn1/ess/ContentHints.cs b/crypto/src/asn1/ess/ContentHints.cs
new file mode 100644
index 000000000..a430fea8d
--- /dev/null
+++ b/crypto/src/asn1/ess/ContentHints.cs
@@ -0,0 +1,92 @@
+using System;
+
+namespace Org.BouncyCastle.Asn1.Ess
+{
+	public class ContentHints
+		: Asn1Encodable
+	{
+		private readonly DerUtf8String contentDescription;
+		private readonly DerObjectIdentifier contentType;
+
+		public static ContentHints GetInstance(
+			object o)
+		{
+			if (o == null || o is ContentHints)
+			{
+				return (ContentHints)o;
+			}
+
+			if (o is Asn1Sequence)
+			{
+				return new ContentHints((Asn1Sequence)o);
+			}
+
+			throw new ArgumentException("unknown object in 'ContentHints' factory : "
+				+ o.GetType().Name + ".");
+		}
+
+		/**
+		 * constructor
+		 */
+		private ContentHints(
+			Asn1Sequence seq)
+		{
+			IAsn1Convertible field = seq[0];
+			if (field.ToAsn1Object() is DerUtf8String)
+			{
+				contentDescription = DerUtf8String.GetInstance(field);
+				contentType = DerObjectIdentifier.GetInstance(seq[1]);
+			}
+			else
+			{
+				contentType = DerObjectIdentifier.GetInstance(seq[0]);
+			}
+		}
+
+		public ContentHints(
+			DerObjectIdentifier contentType)
+		{
+			this.contentType = contentType;
+			this.contentDescription = null;
+		}
+
+		public ContentHints(
+			DerObjectIdentifier	contentType,
+			DerUtf8String		contentDescription)
+		{
+			this.contentType = contentType;
+			this.contentDescription = contentDescription;
+		}
+
+		public DerObjectIdentifier ContentType
+		{
+			get { return contentType; }
+		}
+
+		public DerUtf8String ContentDescription
+		{
+			get { return contentDescription; }
+		}
+
+		/**
+		 * <pre>
+		 * ContentHints ::= SEQUENCE {
+		 *   contentDescription UTF8String (SIZE (1..MAX)) OPTIONAL,
+		 *   contentType ContentType }
+		 * </pre>
+		 */
+		public override Asn1Object ToAsn1Object()
+		{
+			Asn1EncodableVector v = new Asn1EncodableVector();
+
+			if (contentDescription != null)
+			{
+				v.Add(contentDescription);
+			}
+
+			v.Add(contentType);
+
+			return new DerSequence(v);
+		}
+	}
+}