Square is a 128-bit block cipher that accepts a 128-bit key. Designed by Joan Daemen, Vincent Rijmen, and Lars Knudsen, Square is the predecessor of Rijndael, aka the Advanced Encryption Standard.
BONUS
The C file, _square.c, is a standalone Square implementation. To compile it, type:
gcc -Wall -DLITTLE_ENDIAN _square.c
A new binary, a.out, will be created.
To run the binary, type:
./a.out
Note that this implementation has been rigged and tested only on the Intel platform, and thus, it could give wrong results for non-Intel processors.
COPYRIGHT AND LICENSE
Copyright (C) 2003 Julius C. Duque <jcduque (AT) lycos (DOT) com>
This library is free software; you can redistribute it and/or modify it under the same terms as the GNU General Public License.