www.pudn.com > speakfs72.zip > BF_ENC.C, change:2002-01-05,size:5765b


/* crypto/bf/bf_enc.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 "blowfish.h" 
#include "bf_locl.h" 
 
/* Blowfish as implemented from 'Blowfish: Springer-Verlag paper' 
 * (From LECTURE NOTES IN COIMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION, 
 * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993) 
 */ 
 
#if (BF_ROUNDS != 16) && (BF_ROUNDS != 20) 
If you set BF_ROUNDS to some value other than 16 or 20, you will have 
to modify the code. 
#endif 
 
void BF_encrypt(data,key,encrypt) 
BF_LONG *data; 
BF_KEY *key; 
int encrypt; 
        { 
        register BF_LONG l,r,*p,*s; 
 
        p=key->P; 
        s= &(key->S[0]); 
        l=data[0]; 
        r=data[1]; 
 
        if (encrypt) 
                { 
                l^=p[0]; 
                BF_ENC(r,l,s,p[ 1]); 
                BF_ENC(l,r,s,p[ 2]); 
                BF_ENC(r,l,s,p[ 3]); 
                BF_ENC(l,r,s,p[ 4]); 
                BF_ENC(r,l,s,p[ 5]); 
                BF_ENC(l,r,s,p[ 6]); 
                BF_ENC(r,l,s,p[ 7]); 
                BF_ENC(l,r,s,p[ 8]); 
                BF_ENC(r,l,s,p[ 9]); 
                BF_ENC(l,r,s,p[10]); 
                BF_ENC(r,l,s,p[11]); 
                BF_ENC(l,r,s,p[12]); 
                BF_ENC(r,l,s,p[13]); 
                BF_ENC(l,r,s,p[14]); 
                BF_ENC(r,l,s,p[15]); 
                BF_ENC(l,r,s,p[16]); 
#if BF_ROUNDS == 20 
                BF_ENC(r,l,s,p[17]); 
                BF_ENC(l,r,s,p[18]); 
                BF_ENC(r,l,s,p[19]); 
                BF_ENC(l,r,s,p[20]); 
#endif 
                r^=p[BF_ROUNDS+1]; 
                } 
        else 
                { 
                l^=p[BF_ROUNDS+1]; 
#if BF_ROUNDS == 20 
                BF_ENC(r,l,s,p[20]); 
                BF_ENC(l,r,s,p[19]); 
                BF_ENC(r,l,s,p[18]); 
                BF_ENC(l,r,s,p[17]); 
#endif 
                BF_ENC(r,l,s,p[16]); 
                BF_ENC(l,r,s,p[15]); 
                BF_ENC(r,l,s,p[14]); 
                BF_ENC(l,r,s,p[13]); 
                BF_ENC(r,l,s,p[12]); 
                BF_ENC(l,r,s,p[11]); 
                BF_ENC(r,l,s,p[10]); 
                BF_ENC(l,r,s,p[ 9]); 
                BF_ENC(r,l,s,p[ 8]); 
                BF_ENC(l,r,s,p[ 7]); 
                BF_ENC(r,l,s,p[ 6]); 
                BF_ENC(l,r,s,p[ 5]); 
                BF_ENC(r,l,s,p[ 4]); 
                BF_ENC(l,r,s,p[ 3]); 
                BF_ENC(r,l,s,p[ 2]); 
                BF_ENC(l,r,s,p[ 1]); 
                r^=p[0]; 
                } 
        data[1]=l&0xffffffff; 
        data[0]=r&0xffffffff; 
        }