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fpc2pas:
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AlexTP:
Make the type of array

  PMy = ^TMy;
  TMy = packed array[0..1000*1000] of byte;

Make the xor procedure, which takes param of PMy.
Then cast any pointer to PMy.

af0815:
The array holds Bytes, not more not less. The hexadecimal notation is only a visual representation in the code. If you write $fe it will the same as you write 254 .

See here done with CRC under Pascal/Delphi with word https://de.wikipedia.org/wiki/Zyklische_Redundanzpr%C3%BCfung

fpc2pas:
thanks guys it has been solved for now  O:-)

Thaddy:
Note such a task is for real beginners with less than three days of any programming experience at all. I will bet that 99%+ of the forum members have at some point implemented XOR obfuscation. Even with passwords and recurring sequences... >:D

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