Implement Data Encryption for messages

[tmoon8730]

We need a way of encrypting the text data stored in Firebase. It would be ideal to have a centralized way of doing this across all the platforms (at this time JawWeb and JawAndroid).

AES-256 algorithms seem to be the most popular these days so that may be a good algorithm to use.

Tasks:

1. Research specific algorithm to implement

2. Determine method of generating keys / initial vectors in a common method across platforms

3. Implement encryption method on JawAndroid

4. Implement encryption method on JawWeb

[tmoon8730]

I implemented an AES-256 encryption algorithm into the JawWeb project. Currently, the project is using this aesjs implementation with the CTR mode.

We still need to figure out a way of generating and sharing the encryption keys between JawWeb and JawAndroid. There does not seem to be a common way to share the encryption between the Javascript for the web project and the Java of the android project.