Compile: gcc -o feal feal.c

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Usage: feal infile outfile direction

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

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The file ciphertext.txt was generated from:

    feal plaintext.txt ciphertext.txt 0

The key used was (specified as a 6 x 4 array of bytes)
{0x00,0x11,0x22,0x33},
{0xff,0xee,0xdd,0xcc},
{0x0f,0xe1,0x2d,0xc3},
{0x4b,0xa5,0x69,0x78},
{0xde,0xad,0xbe,0xef},
{0xff,0xee,0xdd,0xcc}.
This key is hardcoded into the program.



