fix(decryption): ensure values are positive #4
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dignifiedquire
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When decrypting, care has to be taken to ensure that negative numbers are brought back into the positive range.
In most cases the
if < 0 then += primewas enough, but if the number was more negative than the prime, we ended up with still a negative number. So this was changed to use awhilestatement, which ensures the right thing always happens.Fixes #2