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decrypt.c (4816, 2020-12-15)

# Firmware decryption tool for OP-1 This tool allows the decryption of the OP-1 firmware. Especially the file `OP1_vdk.ldr`. In that file every boot stream block with the flag `BFLAG_CALLBACK` is encrpyted using the XTEA algorithm. For every 24 byte block only the first 8 byte are encrypted and the remaining 16 bytes are unencrypted. ## Compilation Compile with `gcc` gcc -o decrypt decrypt.c ## Usage Key, input file and output file needs to be provided as parameters decrypt [key] [input] [output] ### Key The key is a 16 byte in length and must be provided as 32 character hexadecimal string on the command line.

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