this is the method o have tried but error is CryptoToJS not defined 

Can you please provide me the logic for oauth signature 

I have tried the way they mentioned the screenshot i have consumer key,consumer secret, signature method,access token and token secret how can I get oauth signature,oauth timestamp,oauth nonce in apigee

I tried the same way but I am getting error like CryptoToJS is undefined

I tried using this but I am getting error like CryptoToJS is undefined