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#endif /* ?LITTLE_ENDIAN */
/**
 * The Square block cipher.
 *
 * Algorithm developed by Joan Daemen <daemen.j@protonworld.com> and
 * Vincent Rijmen <vincent.rijmen@esat.kuleuven.ac.be>.  Description available
 * from http://www.esat.kuleuven.ac.be/~cosicart/pdf/VR-9700.PDF
 *
 * This implementation is in the public domain.
 *
 * @author Paulo S.L.M. Barreto <pbarreto@nw.com.br>
 * @author George Barwood <george.barwood@dial.pipex.com>
 * @author Vincent Rijmen <vincent.rijmen@esat.kuleuven.ac.be>
 *
 * Caveat: this code assumes 32-bit words and probably will not work
 * otherwise.
 *
 * To correctly visualize this file, please set tabstop = 4.
 *
 * @version 2.7 (1999.06.29)
 *
 * =============================================================================
 *
 * Differences from version 2.6 (1997.05.24)
 *
 * - Fixed tables (files sqgen.c and consequently square.tab) and hashing
 *   computation (files sqhash.c and sqtest.c) for big-endian platforms.
 *   Thanks to Alan Hawrelak <alan@celcorp.com> for kindly pointing out
 *   the errors and helping in the debugging process.
 *
 * - Fixed the e-mails listed on this note.
 *
 * =============================================================================
 *
 * Differences from version 2.5 (1997.04.25)
 *
 * - Improved key scheduling setup to enhance hashing performance.  Modules
 *   sqgen.c and sqtest.c have been updated accordingly.  The new scheme
 *   (suggested by Vincent Rijmen) uses tables instead of explicit GF(2^8)
 *   multiplications.  Increase in size of the generated code is very small.
 *
 * - Hashing scheme (Matyas-Meyer-Oseas) added.
 *
 * =============================================================================
 *
 * Differences from version 2.4 (1997.04.09):
 *
 * - Changed all initialization functions so that the IV (when applicable)
 *   is separately loaded.
 *
 * - Ciphertext Stealing (CTS) mode added.
 *
 * - Output Feedback (OFB) mode added.
 *
 * - Cipher Block Chaining (CBC) mode added.
 *
 * - Split square.c int several files according to the specific functionality
 *   (basic functions, modes, testing).
 *
 * - Flipped tables according to the endianness of the subjacent platform
 *   for best performance.
 *
 * - Changed "maketabs.c" to "sqgen.c" for compatibility with the Pegwit system.
 *
 * =============================================================================
 *
 * Differences from version 2.3 (1997.04.09):
 *
 * - Defined function squareExpandKey() to enhance performance of both CFB
 *   initialization and hash computation (available in version 2.6).
 *
 * - Changed definition of function squareTransform() to accept a single in-out
 *   parameter, and optimized function squareGenerateRoundKeys accordingly.
 *
 * =============================================================================
 *
 * Differences from version 2.2 (1997.03.03):
 *
 * - Cipher feedback (CFB) mode added (heavily based on an old public domain CFB
 *   shell written by Colin Plumb for the IDEA cipher).
 *
 * - Fixed word size problem (64 bits rather than 32) arising on the Alpha.
 *
 * - Reformatted indented sections of compiler directives for use with old,
 *   non-ANSI compliant compilers.
 *
 * Differences from version 2.1 (1997.03.03):
 *
 * - Added optional Microsoft x86 assembler version, which increases performance
 *   by up to 20% depending on the target machine, and generates smaller code.
 *
 * Differences from version 2.0 (1997.02.11):
 *
 * - Added typecasts to the build-up of out[] in function squareTransform()
 *   to make it portable to 16-bit (MSDOS) systems.
 *
 * - Truncated alogtab[] back to 256 elements and changed the mul() macro
 *   accordingly.  Using an extended table to avoid a division seemed an
 *   unnecessary storage overhead (it could be useful to speed up hash
 *   functions derived from Square, but other optimizations are likely to be
 *   more effective).
 *
 * Differences from version 2.0 (1997.02.11):
 *
 * - Updated definition of Square algorithm (version 1.0 implemented an
 *   embryonic form of Square).
 *
 * ==============================================================================
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF