# Module signing tool problem **URL:** \ **Category:** Module Development\ **Created:** [July 8, 2020, 5:14pm UTC](https://forum.inductiveautomation.com/t/module-signing-tool-problem/36503 "2020-07-08T17:14:59Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![rshah18](https://avatars.discourse-cdn.com/v4/letter/r/7ea924/32.png) [@rshah18](https://forum.inductiveautomation.com/u/rshah18)\ **Post date:** [July 8, 2020, 5:14pm UTC](https://forum.inductiveautomation.com/t/module-signing-tool-problem/36503/1 "2020-07-08T17:14:59Z")
C:\Users\rshah\Downloads\module-signer-master\module-signer-master\target\>java -jar module-signer-1.0.0-SNAPSHOT.jar -keystore=“C:\keyToFile\KeyStore.jks” -alias=tutorialpedia -keystore-pwd=\*\*\*\*\*\* -chain=“C:\Users\rshah\Documents\c ert\1.p7b” -module-in=“C:\Users\rshah\Documents\workbp\Projects\ignition-sdk-examples\opc-ua-device\opc-ua-device-build\target\OPC-UA-Device-Example-unsigned.modl” -module-out=“C:\Users\rshah\Documents\workbp\Projects\ignition-sdk-e xamples\opc-ua-device\opc-ua-device-build\target\OPC-UA-Device-Example-signed.modl” Error: Unable to initialize main class com.inductiveautomation.ignitionsdk.ModuleSigner$Main Caused by: java.lang.NoClassDefFoundError: org/apache/commons/cli/CommandLineParser need some help with this. Not sure what is the problem ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [July 8, 2020, 5:19pm UTC](https://forum.inductiveautomation.com/t/module-signing-tool-problem/36503/2 "2020-07-08T17:19:08Z")
Run `target/module-signer-1.0.0-SNAPSHOT-jar-with-dependencies.jar` instead. This jar has the dependencies bundled. ---
**Author:** ![rshah18](https://avatars.discourse-cdn.com/v4/letter/r/7ea924/32.png) [@rshah18](https://forum.inductiveautomation.com/u/rshah18)\ **Post date:** [July 8, 2020, 5:39pm UTC](https://forum.inductiveautomation.com/t/module-signing-tool-problem/36503/3 "2020-07-08T17:39:50Z")
- I created the keystore using keytool : keytool -genkey -alias tutorialpedia -keyalg RSA -keyStore "C:\keyToFile\KeyStore.jks - then open the keystore in keystore explorer and exported the chain by right clicking on alias - then used the following command. C:\Users\rshah\Downloads\module-signer-master\module-signer-master\target\>java -jar module-signer-1.0.0-SNAPSHOT-jar-with-dependencies.jar -keystore=“C:\keyToFile\KeyStore.jks” -alias=tutorialpedia -keystore-pwd=ramram -chain=“tut orialpedia.p7b” -module-in=“C:\Users\rshah\Documents\workbp\Projects\ignition-sdk-examples\opc-ua-device\opc-ua-device-build\target\OPC-UA-Device-Example-unsigned.modl” -module-out=“C:\Users\rshah\Documents\workbp\Projects\ignition- sdk-examples\opc-ua-device\opc-ua-device-build\target\OPC-UA-Device-Example-signed.modl” Exception in thread “main” java.security.UnrecoverableKeyException: Get Key failed: Given final block not properly padded. Such issues can arise if a bad key is used during decryption. at java.base/sun.security.pkcs12.PKCS12KeyStore.engineGetKey(PKCS12KeyStore.java:462) at java.base/sun.security.util.KeyStoreDelegator.engineGetKey(KeyStoreDelegator.java:90) at java.base/java.security.KeyStore.getKey(KeyStore.java:1057) at com.inductiveautomation.ignitionsdk.ModuleSigner$Main.main(ModuleSigner.java:138) Caused by: javax.crypto.BadPaddingException: Given final block not properly padded. Such issues can arise if a bad key is used during decryption. at java.base/com.sun.crypto.provider.CipherCore.unpad(CipherCore.java:975) at java.base/com.sun.crypto.provider.CipherCore.fillOutputBuffer(CipherCore.java:1056) at java.base/com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:853) at java.base/com.sun.crypto.provider.PKCS12PBECipherCore.implDoFinal(PKCS12PBECipherCore.java:408) at java.base/com.sun.crypto.provider.PKCS12PBECipherCore$PBEWithSHA1AndDESede.engineDoFinal(PKCS12PBECipherCore.java:440) at java.base/javax.crypto.Cipher.doFinal(Cipher.java:2202) at java.base/sun.security.pkcs12.PKCS12KeyStore.lambda$engineGetKey$0(PKCS12KeyStore.java:406) at java.base/sun.security.pkcs12.PKCS12KeyStore$RetryWithZero.run(PKCS12KeyStore.java:302) at java.base/sun.security.pkcs12.PKCS12KeyStore.engineGetKey(PKCS12KeyStore.java:400) … 3 more ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [July 8, 2020, 5:47pm UTC](https://forum.inductiveautomation.com/t/module-signing-tool-problem/36503/4 "2020-07-08T17:47:14Z")
Try renaming the KeyStore so it ends with “.pfx” instead of “.jks”. The tool naively uses the extension to determine the format. If you used a recent version of Java to generate the keystore the format was PKCS12 (".pfx") by default. edit: also, looks like you aren’t specifying the `-alias-pwd` param, which would be the same as your keystore pwd by default. ---
**Author:** ![rshah18](https://avatars.discourse-cdn.com/v4/letter/r/7ea924/32.png) [@rshah18](https://forum.inductiveautomation.com/u/rshah18)\ **Post date:** [July 8, 2020, 5:55pm UTC](https://forum.inductiveautomation.com/t/module-signing-tool-problem/36503/5 "2020-07-08T17:55:31Z")
thank you so much kevin. that really helped. Have a good day!