On 6 Nov 2014, at 15:00, sqwarqDev wrote:
[…] I can't find any guidance on exactly how do I generate and test for valid licence keys at run time?
I wrote this post about the general principles of a secure license key scheme: http://sigpipe.macromates.com/2004/09/05/using-openssl-for-license-keys/
Today you shouldn’t rely on openssl (as it’s deprecated on OS X). If you do not need to encrypt a payload (as in my post) then I suggest making the license be just a serial number followed by a signature on that number (maybe include a short hash of the owner name) — this should give a shorter license key and is also a more commonly supported operation of crypto libraries (generating a digital signature).
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