diff --git a/crypto/src/bcpg/sig/Features.cs b/crypto/src/bcpg/sig/Features.cs
new file mode 100644
index 000000000..29584239a
--- /dev/null
+++ b/crypto/src/bcpg/sig/Features.cs
@@ -0,0 +1,75 @@
+using System;
+
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Bcpg.Sig
+{
+ /**
+ * packet giving signature expiration time.
+ */
+ public class Features
+ : SignatureSubpacket
+ {
+ /** Identifier for the modification detection feature */
+ public static readonly byte FEATURE_MODIFICATION_DETECTION = 1;
+
+ private static byte[] FeatureToByteArray(byte feature)
+ {
+ return new byte[]{ feature };
+ }
+
+ public Features(
+ bool critical,
+ bool isLongLength,
+ byte[] data)
+ : base(SignatureSubpacketTag.Features, critical, isLongLength, data)
+ {
+ }
+
+ public Features(bool critical, byte feature)
+ : base(SignatureSubpacketTag.Features, critical, false, FeatureToByteArray(feature))
+ {
+ }
+
+ /**
+ * Returns if modification detection is supported.
+ */
+ public bool SupportsModificationDetection
+ {
+ get { return SupportsFeature(FEATURE_MODIFICATION_DETECTION); }
+ }
+
+ /**
+ * Returns if a particular feature is supported.
+ */
+ public bool SupportsFeature(byte feature)
+ {
+ return Array.IndexOf(data, feature) >= 0;
+ }
+
+ /**
+ * Sets support for a particular feature.
+ */
+ private void SetSupportsFeature(byte feature, bool support)
+ {
+ if (feature == 0)
+ throw new ArgumentException("cannot be 0", "feature");
+
+ int i = Array.IndexOf(data, feature);
+ if ((i >= 0) == support)
+ return;
+
+ if (support)
+ {
+ data = Arrays.Append(data, feature);
+ }
+ else
+ {
+ byte[] temp = new byte[data.Length - 1];
+ Array.Copy(data, 0, temp, 0, i);
+ Array.Copy(data, i + 1, temp, i, temp.Length - i);
+ data = temp;
+ }
+ }
+ }
+}
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