1 files changed, 81 insertions, 0 deletions
diff --git a/pg/src/main/java/org/spongycastle/bcpg/SignatureSubpacket.java b/pg/src/main/java/org/spongycastle/bcpg/SignatureSubpacket.java
new file mode 100644
index 00000000..c427cef9
--- /dev/null
+++ b/pg/src/main/java/org/spongycastle/bcpg/SignatureSubpacket.java
@@ -0,0 +1,81 @@
+package org.spongycastle.bcpg;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * Basic type for a PGP Signature sub-packet.
+ */
+public class SignatureSubpacket 
+{
+    int               type;
+    boolean           critical;
+    
+    protected byte[]  data;
+    
+    protected SignatureSubpacket(
+        int           type,
+        boolean       critical,
+        byte[]        data)
+    {    
+        this.type = type;
+        this.critical = critical;
+        this.data = data;
+    }
+    
+    public int getType()
+    {
+        return type;
+    }
+    
+    public boolean isCritical()
+    {
+        return critical;
+    }
+    
+    /**
+     * return the generic data making up the packet.
+     */
+    public byte[] getData()
+    {
+        return data;
+    }
+
+    public void encode(
+        OutputStream    out)
+        throws IOException
+    {
+        int    bodyLen = data.length + 1;
+        
+        if (bodyLen < 192)
+        {
+            out.write((byte)bodyLen);
+        }
+        else if (bodyLen <= 8383)
+        {
+            bodyLen -= 192;
+            
+            out.write((byte)(((bodyLen >> 8) & 0xff) + 192));
+            out.write((byte)bodyLen);
+        }
+        else
+        {
+            out.write(0xff);
+            out.write((byte)(bodyLen >> 24));
+            out.write((byte)(bodyLen >> 16));
+            out.write((byte)(bodyLen >> 8));
+            out.write((byte)bodyLen);
+        }
+        
+        if (critical)
+        {
+            out.write(0x80 | type);
+        }
+        else
+        {
+            out.write(type);
+        }
+        
+        out.write(data);
+    }
+}