checksum code in obj-c

Question

I am looking for checksum algorithm written in obj-c so that I can validate a ticket(number) and generate 2Dbar code based on validation.

Any ideas on how to achieve this?

Thanks

Answer 1

Sounds like you can use a public-key cryptographic function.

Encrypt with the private key fixed length information, including a number (the real ticket number) and a random salt (to reduce the chance of someone cracking your key), into a fixed length output.

You can then use the public key to decode that output and verify that the information is there.

Here is some Apple sample code that demonstrates the use of cryptographic functions.

For 2D barcode code, you could start by looking at ZXing