Encrypting files "bad decrypt"


I want to add an encrypted keystore-file to my repository and use it to sign an apk.
I used this guide (Encrypting Files - Travis CI) to encrypt my files. I tried it by using the “travis encrypt-file --pro mykestore.keystore”-command, and by manually encrypting the file with openssl and storing the password as a secret. Both attempts always lead to a “bad decrypt”-error.
I’m using Windows 10, but also tried to encrypt the keystore on my linux server. Both files produce the same error.
This are my attempts: