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Annotation of embedaddon/strongswan/src/libstrongswan/plugins/blowfish/bf_skey.c, revision 1.1.1.1

1.1       misho       1: /* crypto/bf/bf_skey.c */
                      2: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
                      3:  * All rights reserved.
                      4:  *
                      5:  * This package is an SSL implementation written
                      6:  * by Eric Young (eay@cryptsoft.com).
                      7:  * The implementation was written so as to conform with Netscapes SSL.
                      8:  *
                      9:  * This library is free for commercial and non-commercial use as long as
                     10:  * the following conditions are adhered to.  The following conditions
                     11:  * apply to all code found in this distribution, be it the RC4, RSA,
                     12:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
                     13:  * included with this distribution is covered by the same copyright terms
                     14:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
                     15:  *
                     16:  * Copyright remains Eric Young's, and as such any Copyright notices in
                     17:  * the code are not to be removed.
                     18:  * If this package is used in a product, Eric Young should be given attribution
                     19:  * as the author of the parts of the library used.
                     20:  * This can be in the form of a textual message at program startup or
                     21:  * in documentation (online or textual) provided with the package.
                     22:  *
                     23:  * Redistribution and use in source and binary forms, with or without
                     24:  * modification, are permitted provided that the following conditions
                     25:  * are met:
                     26:  * 1. Redistributions of source code must retain the copyright
                     27:  *    notice, this list of conditions and the following disclaimer.
                     28:  * 2. Redistributions in binary form must reproduce the above copyright
                     29:  *    notice, this list of conditions and the following disclaimer in the
                     30:  *    documentation and/or other materials provided with the distribution.
                     31:  * 3. All advertising materials mentioning features or use of this software
                     32:  *    must display the following acknowledgement:
                     33:  *    "This product includes cryptographic software written by
                     34:  *     Eric Young (eay@cryptsoft.com)"
                     35:  *    The word 'cryptographic' can be left out if the routines from the library
                     36:  *    being used are not cryptographic related :-).
                     37:  * 4. If you include any Windows specific code (or a derivative thereof) from
                     38:  *    the apps directory (application code) you must include an acknowledgement:
                     39:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
                     40:  *
                     41:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
                     42:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     43:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     44:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
                     45:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     46:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     47:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     48:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     49:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     50:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     51:  * SUCH DAMAGE.
                     52:  *
                     53:  * The licence and distribution terms for any publicly available version or
                     54:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
                     55:  * copied and put under another distribution licence
                     56:  * [including the GNU Public Licence.]
                     57:  */
                     58: 
                     59: #ifdef __KERNEL__
                     60: #include <linux/types.h>
                     61: #include <linux/string.h>
                     62: #else
                     63: #include <stdio.h>
                     64: #include <string.h>
                     65: #endif
                     66: 
                     67: #include "blowfish.h"
                     68: #include "bf_locl.h"
                     69: #include "bf_pi.h"
                     70: 
                     71: void BF_set_key(BF_KEY *key, int len, const unsigned char *data)
                     72:        {
                     73:        int i;
                     74:        BF_LONG *p,ri,in[2];
                     75:        const unsigned char *d,*end;
                     76: 
                     77: 
                     78:        memcpy((char *)key,(const char *)&bf_init,sizeof(BF_KEY));
                     79:        p=key->P;
                     80: 
                     81:        if (len > ((BF_ROUNDS+2)*4)) len=(BF_ROUNDS+2)*4;
                     82: 
                     83:        d=data;
                     84:        end= &(data[len]);
                     85:        for (i=0; i<(BF_ROUNDS+2); i++)
                     86:                {
                     87:                ri= *(d++);
                     88:                if (d >= end) d=data;
                     89: 
                     90:                ri<<=8;
                     91:                ri|= *(d++);
                     92:                if (d >= end) d=data;
                     93: 
                     94:                ri<<=8;
                     95:                ri|= *(d++);
                     96:                if (d >= end) d=data;
                     97: 
                     98:                ri<<=8;
                     99:                ri|= *(d++);
                    100:                if (d >= end) d=data;
                    101: 
                    102:                p[i]^=ri;
                    103:                }
                    104: 
                    105:        in[0]=0L;
                    106:        in[1]=0L;
                    107:        for (i=0; i<(BF_ROUNDS+2); i+=2)
                    108:                {
                    109:                BF_encrypt(in,key);
                    110:                p[i  ]=in[0];
                    111:                p[i+1]=in[1];
                    112:                }
                    113: 
                    114:        p=key->S;
                    115:        for (i=0; i<4*256; i+=2)
                    116:                {
                    117:                BF_encrypt(in,key);
                    118:                p[i  ]=in[0];
                    119:                p[i+1]=in[1];
                    120:                }
                    121:        }
                    122: