On: Forcing a file's CRC to any value (2018)

[shric]

What would be really clever is if it could alter, say, source code or natural language prose of sufficient length to force a specific CRC preserving the semantics of the program/prose e.g. by reordering or changing words and/or identifiers. (changing 4 bytes to arbitrary values in a comment is against the spirit of this)

[pxx → shric]

Here's a repo that does something a little more generic that you can adapt for that.

https://github.com/madler/spoof/

(you can naively use this to flip case where the case is not semantically important, but you can also extend this as needed)