Rethrow IllegalArgumentException for invalid unhashed IssuerKeyID subpacket as MalformedPacketException

Author: vanitasvitae

pg/src/main/java/org/bouncycastle/bcpg/SignaturePacket.java

@@ -214,7 +214,14 @@ else if (p instanceof SignatureCreationTime)
             SignatureSubpacket p = (SignatureSubpacket)vec.elementAt(i);
             if (p instanceof IssuerKeyID)
             {
-                keyID = ((IssuerKeyID)p).getKeyID();
+                try
+                {
+                    keyID = ((IssuerKeyID) p).getKeyID();
+                }
+                catch (IllegalArgumentException e)
+                {
+                    throw new MalformedPacketException("Malformed IssuerKeyID subpacket.", e);
+                }
             }
 
             unhashedData[i] = p;