1 files changed, 54 insertions, 0 deletions
diff --git a/crypto/src/bcpg/sig/SignatureExpirationTime.cs b/crypto/src/bcpg/sig/SignatureExpirationTime.cs
new file mode 100644
index 000000000..7fddf5743
--- /dev/null
+++ b/crypto/src/bcpg/sig/SignatureExpirationTime.cs
@@ -0,0 +1,54 @@
+using System;
+
+
+
+namespace Org.BouncyCastle.Bcpg.Sig
+{
+    /**
+    * packet giving signature expiration time.
+    */
+    public class SignatureExpirationTime
+        : SignatureSubpacket
+    {
+        protected static byte[] TimeToBytes(
+            long      t)
+        {
+            byte[]    data = new byte[4];
+
+            data[0] = (byte)(t >> 24);
+            data[1] = (byte)(t >> 16);
+            data[2] = (byte)(t >> 8);
+            data[3] = (byte)t;
+
+            return data;
+        }
+
+        public SignatureExpirationTime(
+            bool    critical,
+            byte[]     data)
+            : base(SignatureSubpacketTag.ExpireTime, critical, data)
+    {
+        }
+
+        public SignatureExpirationTime(
+            bool    critical,
+            long       seconds)
+            : base(SignatureSubpacketTag.ExpireTime, critical, TimeToBytes(seconds))
+        {
+        }
+
+        /**
+        * return time in seconds before signature expires after creation time.
+        */
+        public long Time
+        {
+            get
+            {
+                long time = ((long)(data[0] & 0xff) << 24) | ((long)(data[1] & 0xff) << 16)
+                    | ((long)(data[2] & 0xff) << 8) | ((long)data[3] & 0xff);
+
+                return time;
+            }
+        }
+    }
+}