Report extension type in unsupported_extension error messages

Author: peterdettman

tls/src/main/java/org/bouncycastle/tls/DTLSClientProtocol.java

@@ -877,7 +877,8 @@ protected void processServerHello(ClientHandshakeState state, byte[] body)
                  */
                 if (null == TlsUtils.getExtensionData(state.clientExtensions, extType))
                 {
-                    throw new TlsFatalAlert(AlertDescription.unsupported_extension);
+                    throw new TlsFatalAlert(AlertDescription.unsupported_extension,
+                        "Unrequested extension in ServerHello: " + ExtensionType.getText(extType.intValue()));
                 }
 
                 /*

tls/src/main/java/org/bouncycastle/tls/TlsClientProtocol.java

@@ -869,7 +869,7 @@ protected void process13HelloRetryRequest(ServerHello helloRetryRequest)
                 if (null == TlsUtils.getExtensionData(clientExtensions, extType))
                 {
                     throw new TlsFatalAlert(AlertDescription.unsupported_extension,
-                        "received unrequested extension response: " + ExtensionType.getText(extensionType));
+                        "Unrequested extension in HelloRetryRequest: " + ExtensionType.getText(extensionType));
                 }
             }
         }
@@ -1529,7 +1529,8 @@ protected void receive13EncryptedExtensions(ByteArrayInputStream buf)
 
                 if (null == TlsUtils.getExtensionData(clientExtensions, extType))
                 {
-                    throw new TlsFatalAlert(AlertDescription.unsupported_extension);
+                    throw new TlsFatalAlert(AlertDescription.unsupported_extension,
+                        "Unrequested extension in EncryptedExtensions: " + ExtensionType.getText(extType.intValue()));
                 }
             }
         }