I trying to perform POODLE attack on a hosted server that I've configured to support only SSLv3. The scenario is I logged on my server and it sends the cookie in response that will be stored by the client. I need not be in middle since I'm the attacker and the victim. So to get the decrypted cookie I have to craft a POST request and replay it to my server. The crafted request will be
POST Cookie: name="cookie value" "\r\n\r\n"body "MAC" padding bytes
So, how to get length of the cookie value since it is encrypted and it is required to add the padding bytes ?