Encrypted Consent

See our blog post on the ManyClasses website for the motivation for this project.

To use this script:

1. Update config.php if you wish. Pay special attention to the $KEY_LENGTH variable, which sets an upper bound on how many unique requests the consent script can handle. If $KEY_LENGTH is 3, then there are 900 unique keys -- 100 thru 999. Roughly half of the keys will be consent and half dissent, so the script will run about 400 times before it runs out of unique keys. We exclude keys where the value would have a leading 0 so that Canvas's number field validator runs properly.
2. Upload all four .php files onto a webserver. Ensure that the folder that contains the .php files is writeable so that the sqlite database can be generated.
3. Run setup.php by going to the URL in your browser. With key lengths of 4 or more the script can take a while to run. It will print a message when it is complete.
4. Use consent_buttons.php to get consent values. You can embed this form in a Canvas quiz, for example.