SpiceCrypt: A Python library for decrypting LTspice encrypted model files

Coming from a brief failed attempt of using ghidra to see if keys were part of binary, this is a welcome news.

Next on wishlist is someone doing the same for encrypted fpga verilog blobs.

The file header contains two 32-bit keys used to derive a substitution table index and step value for decryption.

In other words, obfuscation.

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