FreeBSD/Linux Kernel Cross Reference
sys/crypto/blowfish/bf_skey.c

     /*      $KAME: bf_skey.c,v 1.7 2002/02/27 01:33:59 itojun Exp $ */
     
     /* crypto/bf/bf_skey.c */
     
     /* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
      * All rights reserved.
      *
      * This package is an SSL implementation written
      * by Eric Young (eay@mincom.oz.au).
     * The implementation was written so as to conform with Netscapes SSL.
     *
     * This library is free for commercial and non-commercial use as long as
     * the following conditions are aheared to.  The following conditions
     * apply to all code found in this distribution, be it the RC4, RSA,
     * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     * included with this distribution is covered by the same copyright terms
     * except that the holder is Tim Hudson (tjh@mincom.oz.au).
     *
     * Copyright remains Eric Young's, and as such any Copyright notices in
     * the code are not to be removed.
     * If this package is used in a product, Eric Young should be given attribution
     * as the author of the parts of the library used.
     * This can be in the form of a textual message at program startup or
     * in documentation (online or textual) provided with the package.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *    "This product includes cryptographic software written by
     *     Eric Young (eay@mincom.oz.au)"
     *    The word 'cryptographic' can be left out if the rouines from the library
     *    being used are not cryptographic related :-).
     * 4. If you include any Windows specific code (or a derivative thereof) from
     *    the apps directory (application code) you must include an acknowledgement:
     *    "This product includes software written by Tim Hudson (tjh@mincom.oz.au)"
     *
     * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * The licence and distribution terms for any publically available version or
     * derivative of this code cannot be changed.  i.e. this code cannot simply be
     * copied and put under another distribution licence
     * [including the GNU Public Licence.]
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/10.1/sys/crypto/blowfish/bf_skey.c 116174 2003-06-10 21:44:29Z obrien $");
    
    #include <sys/types.h>
    #include <sys/time.h>
    #include <sys/systm.h>
    #include <crypto/blowfish/blowfish.h>
    #include <crypto/blowfish/bf_locl.h>
    #include <crypto/blowfish/bf_pi.h>
    
    void
    BF_set_key(key, len, data)
            BF_KEY *key;
            int len;
            unsigned char *data;
    {
            int i;
            BF_LONG *p, ri, in[2];
            unsigned char *d, *end;
    
            memcpy((char *)key, (const char *)&bf_init, sizeof(BF_KEY));
            p = key->P;
    
            if (len > ((BF_ROUNDS + 2) * 4))
                    len = (BF_ROUNDS + 2) * 4;
    
            d = data;
            end= &(data[len]);
            for (i = 0; i < BF_ROUNDS + 2; i++) {
                    ri = *(d++);
                    if (d >= end) d = data;
    
                    ri <<= 8;
                    ri |= *(d++);
                    if (d >= end) d = data;
    
                    ri <<= 8;
                    ri |= *(d++);
                   if (d >= end) d = data;
   
                   ri <<= 8;
                   ri |= *(d++);
                   if (d >= end) d = data;
   
                   p[i] ^= ri;
           }
   
           in[0] = 0L;
           in[1] = 0L;
           for (i = 0; i < BF_ROUNDS + 2; i += 2) {
                   BF_encrypt(in, key);
                   p[i  ] = in[0];
                   p[i+1] = in[1];
           }
   
           p = key->S;
           for (i = 0; i < 4 * 256; i += 2) {
                   BF_encrypt(in, key);
                   p[i  ] = in[0];
                   p[i+1] = in[1];
           }
   }

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