AES-256 and PKCS7Padding fails in Java

Question

I have a couple of library, C#, PHP and Android where they all encrypt/decrypt a string in the same way so they are all compatible with each other, i.e. C# writes and encryp

Answer 1

First, in Java, the standard padding name is PKCS5Padding, not PKCS7Padding. Java is actually performing PKCS #7 padding, but in the JCA specification, PKCS5Padding is the name given.

Next, you are trying to use AES-256, so you'll need to install the Unlimited Strength Jurisdiction policy files.

Hopefully this is just an example and you aren't using the same IV for every message, right?