# Self-Signing a Module **URL:** \ **Category:** 3rd Party Modules\ **Created:** [November 18, 2016, 3:57pm UTC](https://forum.inductiveautomation.com/t/self-signing-a-module/12380 "2016-11-18T15:57:07Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Polynomial](https://avatars.discourse-cdn.com/v4/letter/p/848f3c/32.png) [@Polynomial](https://forum.inductiveautomation.com/u/Polynomial)\ **Post date:** [November 18, 2016, 3:57pm UTC](https://forum.inductiveautomation.com/t/self-signing-a-module/12380/1 "2016-11-18T15:57:07Z")
I’m trying to follow the directions on this page ([docs.inductiveautomation.com:84 … le+Signing](https://docs.inductiveautomation.com:8443/display/SE/Module+Signing)) but I don’t think I’m doing it the right way. How do you use KeyStore Explorer to create the files I need to self-sign a module? Can anyone give me some step-by-step instruction? I also ran into a “JNI error has occurred. Check your installation error” when I tried to run the Module Signer. I’m not sure it was due to the files I was trying to feed it or something else though. Any help would be appreciated, thanks! ---
**Author:** ![Polynomial](https://avatars.discourse-cdn.com/v4/letter/p/848f3c/32.png) [@Polynomial](https://forum.inductiveautomation.com/u/Polynomial)\ **Post date:** [November 21, 2016, 2:29pm UTC](https://forum.inductiveautomation.com/t/self-signing-a-module/12380/2 "2016-11-21T14:29:18Z")
I figured it out so I’ll post the basic steps here for posterity: [ul]1. In KeyStore Explorer, generate a new Key Pair. 2. Right-click on the new Key Pair, select Export-\>Export Certificate Chain. Select the “Entire Chain” option and pick PKCS #7 to get the p7b file. 3. Run the command given on the documentation page for the module-signer. I used Windows PowerShell and had to put quotes around the variable values (alias, chain, etc).[/ul] I hope this’ll help someone else! ---
**Author:** ![JWolnisty](https://avatars.discourse-cdn.com/v4/letter/j/e0b2c6/32.png) [@JWolnisty](https://forum.inductiveautomation.com/u/JWolnisty)\ **Post date:** [August 24, 2018, 4:36pm UTC](https://forum.inductiveautomation.com/t/self-signing-a-module/12380/3 "2018-08-24T16:36:40Z")
I’m at my wits end with the module signer and I’m sure it is something simple. No matter what I do I constantly get “keystore was tampered with or password is incorrect”. I have created keystores, recreated them, added key-pairs, exported, imported, put quotes around every parameter, taken them off. I’m considering sacrificing a chicken, sprinkling its blood on the keyboard and bowing towards Folsom next. Any suggestions (to save the life of a chicken?) ---
**Author:** ![PRAMANJ](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pramanj/32/66935_2.png) [@PRAMANJ](https://forum.inductiveautomation.com/u/PRAMANJ)\ **Post date:** [August 24, 2018, 4:47pm UTC](https://forum.inductiveautomation.com/t/self-signing-a-module/12380/4 "2018-08-24T16:47:59Z")
See first few entries in the post > [@Module signing tool](http://forum.inductiveautomation.com/t/module-signing-tool/18885): > > While self signing modules using java -jar module-signer.jar \ -keystore=/keystore.jks -keystore-pwd= -alias= -alias-pwd= -chain=/cert.p7b -module-in=/my-unsigned-module.modl -module-out=/my-signed-module.modl as given in the SDK documentation, how to get chain path /cert.p7b? I don't see any such files in my folder where I created the keypair using the keystore explorer tool ver 5.3.2? I get error "no RSA PrivateKey found for alias 'gcm\_certificate'." I am at a loss how to use … You have run the module-signer tool with proper command after you have generated and exported the keys with KeyStore Explorer tool. ---
**Author:** ![JWolnisty](https://avatars.discourse-cdn.com/v4/letter/j/e0b2c6/32.png) [@JWolnisty](https://forum.inductiveautomation.com/u/JWolnisty)\ **Post date:** [August 24, 2018, 5:16pm UTC](https://forum.inductiveautomation.com/t/self-signing-a-module/12380/5 "2018-08-24T17:16:37Z")
The chicken blood fixed it! Actually I found a typo.