1 files changed, 48 insertions, 0 deletions
diff --git a/pg/src/main/java/org/spongycastle/bcpg/sig/SignatureExpirationTime.java b/pg/src/main/java/org/spongycastle/bcpg/sig/SignatureExpirationTime.java
new file mode 100644
index 00000000..bcf1444d
--- /dev/null
+++ b/pg/src/main/java/org/spongycastle/bcpg/sig/SignatureExpirationTime.java
@@ -0,0 +1,48 @@
+package org.spongycastle.bcpg.sig;
+
+import org.spongycastle.bcpg.SignatureSubpacket;
+import org.spongycastle.bcpg.SignatureSubpacketTags;
+
+/**
+ * packet giving signature expiration time.
+ */
+public class SignatureExpirationTime 
+    extends 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(
+        boolean    critical,
+        byte[]     data)
+    {
+        super(SignatureSubpacketTags.EXPIRE_TIME, critical, data);
+    }
+    
+    public SignatureExpirationTime(
+        boolean    critical,
+        long       seconds)
+    {
+        super(SignatureSubpacketTags.EXPIRE_TIME, critical, timeToBytes(seconds));
+    }
+    
+    /**
+     * return time in seconds before signature expires after creation time.
+     */
+    public long getTime()
+    {
+        long    time = ((long)(data[0] & 0xff) << 24) | ((data[1] & 0xff) << 16) | ((data[2] & 0xff) << 8) | (data[3] & 0xff);
+        
+        return time;
+    }
+}