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I want to use CBC mode encryption for the message using AES algorithm (AES code is available)
in javascript.
How can this be done?
I am new to cryptography and javascript.
Generating key & IV, padding, taking care of padding while decrypting are the issues to be handled.
How to get started with this?
I’d suggest you start by reading NIST: Recommendation for Block Cipher Modes of Operation.
It covers CBC, padding and how to generate IVs.
On a side-note:
You may want to start with Counter Mode (also covered in the recommendation). It’s by far easier to understand and implement. You don’t need any padding and you don’t need a separate function for decryption. Encryption and decryption are basically the same thing in Counter Mode.