They also took more aggressive steps to reduce key sharing. Ambrosia now had better control over code distribution, but they assumed their renewal server would never be shut down. This new method was based on polynomial hashing and included a timestamp so that codes could be expired and renewed. Once you have the bitstring module installed via sudo pip install bitstring, you can test the output yourself with python aswreg_v1.py "Anonymous" 100 "Slithereens".Īs Ambrosia's Matt Slot explains, the old system continued to allow a lot of piracy, so in the early 2000's they decided to switch to a more challenging registration system. Here is a Python implementation of the v1 system: aswreg_v1.py The following chart shows an example using a well-known hacked code for Slithereens. This maps the 32-bit string into 8 characters, but due to the limit of a hex digit to only encode 16 values, codes only contain letters from the first 16 of the alphabet. The resulting 32 bits are converted into a text registration code by adding the ASCII offset of $41 to each hex digit. However, the rest of the algorithm remained essentially unchanged. The second loop repeats that operation, only using the game's name instead of the license holder's name.īeginning with Mars Rising, later games added a step to these loops: XOR the current code with the common hex string $DEADBEEF. The first loop iterates over each letter of the capitalized licensee name, adding the ASCII representation of that letter with the number of copies and then rotating the resulting bits. Given a licensee name, number of copies, and game name, the code generator runs through two loops. All of their classic titles use the original algorithm by Andrew Welch. In their earliest days, ASW didn't require registration, but they eventually began locking core features away behind codes.
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