Compile: gcc -o CMEA CMEA.c

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Usage: CMEA inputfile outputfile

where inputfile == name of input file
      outputfile == name of outputfile

Note that if the file is not an even number of blocks,
the final block is padded with 0s.
Note also that it is not necessary to specify
whether the file is being encrypted or decrypted,
since the cipher is its own inverse.

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The file ciphertext.txt was generated from

    CMEA plaintext.txt ciphertext.txt

The 8-byte key used was
0x0f,0x3e,0x33,0xd4,0x01,0x1a,0xbc,0x45
which is hardcoded into the program.
