Compile: gcc -o Akelarre Akelarre.c

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Usage: Akelarre rounds infile outfile direction

where rounds == number of rounds
      infile == name of input file
      outfile == name of output file
      direction == 0 to encrypt, 1 to decrypt

It is recommended to use 4 rounds

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The file ciphertext.txt was generated from:

     Akelarre 4 plaintext.txt ciphertext.txt 0

That is, 4 rounds were used. The 128-bit key used was
0x76543210,0xdeadbeef,0xfedcba98,0xa55aa55a
which is hardcoded into the program.
