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serpent-encrypt.c

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  • serpent-encrypt.c 14.49 KiB
    /* serpent-encrypt.c
    
       The serpent block cipher.
    
       For more details on this algorithm, see the Serpent website at
       http://www.cl.cam.ac.uk/~rja14/serpent.html
    
       Copyright (C) 2011  Niels Möller
       Copyright (C) 2010, 2011  Simon Josefsson
       Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
    
       This file is part of GNU Nettle.
    
       GNU Nettle is free software: you can redistribute it and/or
       modify it under the terms of either:
    
         * the GNU Lesser General Public License as published by the Free
           Software Foundation; either version 3 of the License, or (at your
           option) any later version.
    
       or
    
         * the GNU General Public License as published by the Free
           Software Foundation; either version 2 of the License, or (at your
           option) any later version.
    
       or both in parallel, as here.
    
       GNU Nettle is distributed in the hope that it will be useful,
       but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       General Public License for more details.
    
       You should have received copies of the GNU General Public License and
       the GNU Lesser General Public License along with this program.  If
       not, see http://www.gnu.org/licenses/.
    */
    
    /* This file is derived from cipher/serpent.c in Libgcrypt v1.4.6.
       The adaption to Nettle was made by Simon Josefsson on 2010-12-07
       with final touches on 2011-05-30.  Changes include replacing
       libgcrypt with nettle in the license template, renaming
       serpent_context to serpent_ctx, renaming u32 to uint32_t, removing
       libgcrypt stubs and selftests, modifying entry function prototypes,
       using FOR_BLOCKS to iterate through data in encrypt/decrypt, using
       LE_READ_UINT32 and LE_WRITE_UINT32 to access data in
       encrypt/decrypt, and running indent on the code. */
    
    #if HAVE_CONFIG_H
    #include "config.h"
    #endif
    
    #include <assert.h>
    #include <limits.h>
    
    #include "serpent.h"
    
    #include "macros.h"
    #include "serpent-internal.h"
    
    /* These are the S-Boxes of Serpent.  They are copied from Serpents
       reference implementation (the optimized one, contained in
       `floppy2') and are therefore:
    
         Copyright (C) 1998 Ross Anderson, Eli Biham, Lars Knudsen.
    
      To quote the Serpent homepage
      (http://www.cl.cam.ac.uk/~rja14/serpent.html):
    
      "Serpent is now completely in the public domain, and we impose no