supports barcode generation / scanning and support functions for ubersystem
set the following vars in your development.ini:
a secret 10-digit key (KEEP THIS SAFE, SHARE WITH NO-ONE) used to encrypt/decrypt barcodes
barcode_key = "ABCDEF1234"
a secret numeric salt value (KEEP THIS SAFE, SHARE WITH NO-ONE) used to encrypt/decrypt barcodes pick a random number between 0 and max of 1,000,000 (don't go over)
barcode_salt = 121212
a 1-byte event-ID number embedded in each barcode that tells us what event this came from
barcode_event_id = 2
A barcode contains a badge_number and an event_id. The event_id is just a unique ID that is used for verification purposes.
These are symetrically encrypted with a salt into a 6-character barcode_number which is printed on the badge itself. It might look like this: aXv5bC This is a CODE-128 compliant encoding.
If you have a barcode number, you need the key and salt to decrypt it, which will yield the badge number and the event ID. Ubersystem installations can do this, but normal users can't generate a badge number and event ID from a barcode, and vice versa.
An attacker won't be able to generate a valid barcode number without the secret key, salt, and event_id.
If you have a barcode and want to know the badge#, call get_badge_num_from_barcode():
badge_num = get_badge_num_from_barcode(barocde_num='ABC123')
If you have a badge number and want to generate a barcode from it, call generate_barcode_from_badge_num()
barcode = generate_barcode_from_badge_num(badge_num=3)
These numbers are encrypted/decrypted using the secret key, salt, and event_id in the INI file. RAMS doesn't need to store a list of barcodes anywhere since this can be computed anytime it's needed.