Generate hmac, Key, and IV for cookie SSO

Hi, I am using cookie SSO and  have used the values provided in the documentation at 

https://community.telligent.com/community/10/w/developer-training/53134/cookies-authentication#Sample_Data

under "AES CBC + HMAC" (Encryption Key (base64); HMAC Key (base64); Initialisation Vector (base64)) for initial testing.

However I would like to generate my own values to use. How can I do this?

Thanks