Home | History | Annotate | Line # | Download | only in blowfish 
      1 /*	$NetBSD: bf_skey.c,v 1.6 2005/12/11 12:20:48 christos Exp $	*/
      2 /*	$KAME: bf_skey.c,v 1.5 2000/11/06 13:58:08 itojun Exp $	*/
      3 
      4 /* crypto/bf/bf_skey.c */
      5 /* Copyright (C) 1995-1997 Eric Young (eay (at) mincom.oz.au)
      6  * All rights reserved.
      7  *
      8  * This package is an SSL implementation written
      9  * by Eric Young (eay (at) mincom.oz.au).
     10  * The implementation was written so as to conform with Netscapes SSL.
     11  *
     12  * This library is free for commercial and non-commercial use as long as
     13  * the following conditions are aheared to.  The following conditions
     14  * apply to all code found in this distribution, be it the RC4, RSA,
     15  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     16  * included with this distribution is covered by the same copyright terms
     17  * except that the holder is Tim Hudson (tjh (at) mincom.oz.au).
     18  *
     19  * Copyright remains Eric Young's, and as such any Copyright notices in
     20  * the code are not to be removed.
     21  * If this package is used in a product, Eric Young should be given attribution
     22  * as the author of the parts of the library used.
     23  * This can be in the form of a textual message at program startup or
     24  * in documentation (online or textual) provided with the package.
     25  *
     26  * Redistribution and use in source and binary forms, with or without
     27  * modification, are permitted provided that the following conditions
     28  * are met:
     29  * 1. Redistributions of source code must retain the copyright
     30  *    notice, this list of conditions and the following disclaimer.
     31  * 2. Redistributions in binary form must reproduce the above copyright
     32  *    notice, this list of conditions and the following disclaimer in the
     33  *    documentation and/or other materials provided with the distribution.
     34  * 3. All advertising materials mentioning features or use of this software
     35  *    must display the following acknowledgement:
     36  *    "This product includes cryptographic software written by
     37  *     Eric Young (eay (at) mincom.oz.au)"
     38  *    The word 'cryptographic' can be left out if the rouines from the library
     39  *    being used are not cryptographic related :-).
     40  * 4. If you include any Windows specific code (or a derivative thereof) from
     41  *    the apps directory (application code) you must include an acknowledgement:
     42  *    "This product includes software written by Tim Hudson (tjh (at) mincom.oz.au)"
     43  *
     44  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     54  * SUCH DAMAGE.
     55  *
     56  * The licence and distribution terms for any publically available version or
     57  * derivative of this code cannot be changed.  i.e. this code cannot simply be
     58  * copied and put under another distribution licence
     59  * [including the GNU Public Licence.]
     60  */
     61 
     62 #include <sys/cdefs.h>
     63 __KERNEL_RCSID(0, "$NetBSD: bf_skey.c,v 1.6 2005/12/11 12:20:48 christos Exp $");
     64 
     65 #include <sys/types.h>
     66 #include <sys/time.h>
     67 #ifdef _KERNEL
     68 #include <sys/systm.h>
     69 #else
     70 #include <string.h>
     71 #endif
     72 #include <crypto/blowfish/blowfish.h>
     73 #include <crypto/blowfish/bf_locl.h>
     74 #include <crypto/blowfish/bf_pi.h>
     75 
     76 void
     77 BF_set_key(BF_KEY *key, int len, const unsigned char *data)
     78 {
     79 	int i;
     80 	BF_LONG *p, ri, in[2];
     81 	const unsigned char *d, *end;
     82 
     83 	memcpy(key, &bf_init, sizeof(BF_KEY));
     84 	p = key->P;
     85 
     86 	if (len > ((BF_ROUNDS + 2) * 4))
     87 		len = (BF_ROUNDS + 2) * 4;
     88 
     89 	d = data;
     90 	end= &(data[len]);
     91 	for (i = 0; i < BF_ROUNDS + 2; i++) {
     92 		ri = *(d++);
     93 		if (d >= end) d = data;
     94 
     95 		ri <<= 8;
     96 		ri |= *(d++);
     97 		if (d >= end) d = data;
     98 
     99 		ri <<= 8;
    100 		ri |= *(d++);
    101 		if (d >= end) d = data;
    102 
    103 		ri <<= 8;
    104 		ri |= *(d++);
    105 		if (d >= end) d = data;
    106 
    107 		p[i] ^= ri;
    108 	}
    109 
    110 	in[0] = 0L;
    111 	in[1] = 0L;
    112 	for (i = 0; i < BF_ROUNDS + 2; i += 2) {
    113 		BF_encrypt(in, key);
    114 		p[i  ] = in[0];
    115 		p[i+1] = in[1];
    116 	}
    117 
    118 	p = key->S;
    119 	for (i = 0; i < 4 * 256; i += 2) {
    120 		BF_encrypt(in, key);
    121 		p[i  ] = in[0];
    122 		p[i+1] = in[1];
    123 	}
    124 }
    125