307 lines
7.5 KiB
C
307 lines
7.5 KiB
C
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/* $OpenBSD: bf_enc.c,v 1.6 2014/10/28 07:35:58 jsg Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <openssl/blowfish.h>
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#include "bf_locl.h"
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/* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
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* (From LECTURE NOTES IN COMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
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* CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
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*/
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#if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
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#error If you set BF_ROUNDS to some value other than 16 or 20, you will have \
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to modify the code.
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#endif
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void BF_encrypt(BF_LONG *data, const BF_KEY *key)
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{
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#ifndef BF_PTR2
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BF_LONG l,r;
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const BF_LONG *p,*s;
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p=key->P;
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s= &(key->S[0]);
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l=data[0];
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r=data[1];
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l^=p[0];
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BF_ENC(r,l,s,p[ 1]);
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BF_ENC(l,r,s,p[ 2]);
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BF_ENC(r,l,s,p[ 3]);
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BF_ENC(l,r,s,p[ 4]);
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BF_ENC(r,l,s,p[ 5]);
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BF_ENC(l,r,s,p[ 6]);
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BF_ENC(r,l,s,p[ 7]);
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BF_ENC(l,r,s,p[ 8]);
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BF_ENC(r,l,s,p[ 9]);
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BF_ENC(l,r,s,p[10]);
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BF_ENC(r,l,s,p[11]);
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BF_ENC(l,r,s,p[12]);
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BF_ENC(r,l,s,p[13]);
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BF_ENC(l,r,s,p[14]);
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BF_ENC(r,l,s,p[15]);
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BF_ENC(l,r,s,p[16]);
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#if BF_ROUNDS == 20
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BF_ENC(r,l,s,p[17]);
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BF_ENC(l,r,s,p[18]);
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BF_ENC(r,l,s,p[19]);
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BF_ENC(l,r,s,p[20]);
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#endif
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r^=p[BF_ROUNDS+1];
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data[1]=l&0xffffffffL;
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data[0]=r&0xffffffffL;
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#else
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BF_LONG l,r,t,*k;
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l=data[0];
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r=data[1];
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k=(BF_LONG*)key;
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l^=k[0];
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BF_ENC(r,l,k, 1);
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BF_ENC(l,r,k, 2);
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BF_ENC(r,l,k, 3);
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BF_ENC(l,r,k, 4);
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BF_ENC(r,l,k, 5);
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BF_ENC(l,r,k, 6);
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BF_ENC(r,l,k, 7);
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BF_ENC(l,r,k, 8);
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BF_ENC(r,l,k, 9);
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BF_ENC(l,r,k,10);
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BF_ENC(r,l,k,11);
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BF_ENC(l,r,k,12);
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BF_ENC(r,l,k,13);
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BF_ENC(l,r,k,14);
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BF_ENC(r,l,k,15);
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BF_ENC(l,r,k,16);
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#if BF_ROUNDS == 20
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BF_ENC(r,l,k,17);
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BF_ENC(l,r,k,18);
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BF_ENC(r,l,k,19);
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BF_ENC(l,r,k,20);
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#endif
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r^=k[BF_ROUNDS+1];
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data[1]=l&0xffffffffL;
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data[0]=r&0xffffffffL;
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#endif
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}
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#ifndef BF_DEFAULT_OPTIONS
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void BF_decrypt(BF_LONG *data, const BF_KEY *key)
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{
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#ifndef BF_PTR2
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BF_LONG l,r;
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const BF_LONG *p,*s;
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p=key->P;
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s= &(key->S[0]);
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l=data[0];
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r=data[1];
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l^=p[BF_ROUNDS+1];
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#if BF_ROUNDS == 20
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BF_ENC(r,l,s,p[20]);
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BF_ENC(l,r,s,p[19]);
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BF_ENC(r,l,s,p[18]);
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BF_ENC(l,r,s,p[17]);
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#endif
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BF_ENC(r,l,s,p[16]);
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BF_ENC(l,r,s,p[15]);
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BF_ENC(r,l,s,p[14]);
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BF_ENC(l,r,s,p[13]);
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BF_ENC(r,l,s,p[12]);
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BF_ENC(l,r,s,p[11]);
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BF_ENC(r,l,s,p[10]);
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BF_ENC(l,r,s,p[ 9]);
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BF_ENC(r,l,s,p[ 8]);
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BF_ENC(l,r,s,p[ 7]);
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BF_ENC(r,l,s,p[ 6]);
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BF_ENC(l,r,s,p[ 5]);
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BF_ENC(r,l,s,p[ 4]);
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BF_ENC(l,r,s,p[ 3]);
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BF_ENC(r,l,s,p[ 2]);
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BF_ENC(l,r,s,p[ 1]);
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r^=p[0];
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data[1]=l&0xffffffffL;
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data[0]=r&0xffffffffL;
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#else
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BF_LONG l,r,t,*k;
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l=data[0];
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r=data[1];
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k=(BF_LONG *)key;
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l^=k[BF_ROUNDS+1];
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#if BF_ROUNDS == 20
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BF_ENC(r,l,k,20);
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BF_ENC(l,r,k,19);
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BF_ENC(r,l,k,18);
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BF_ENC(l,r,k,17);
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#endif
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BF_ENC(r,l,k,16);
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BF_ENC(l,r,k,15);
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BF_ENC(r,l,k,14);
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BF_ENC(l,r,k,13);
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BF_ENC(r,l,k,12);
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BF_ENC(l,r,k,11);
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BF_ENC(r,l,k,10);
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BF_ENC(l,r,k, 9);
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BF_ENC(r,l,k, 8);
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BF_ENC(l,r,k, 7);
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BF_ENC(r,l,k, 6);
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BF_ENC(l,r,k, 5);
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BF_ENC(r,l,k, 4);
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BF_ENC(l,r,k, 3);
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BF_ENC(r,l,k, 2);
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BF_ENC(l,r,k, 1);
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r^=k[0];
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data[1]=l&0xffffffffL;
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data[0]=r&0xffffffffL;
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#endif
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}
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void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
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const BF_KEY *schedule, unsigned char *ivec, int encrypt)
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{
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BF_LONG tin0,tin1;
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BF_LONG tout0,tout1,xor0,xor1;
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long l=length;
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BF_LONG tin[2];
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if (encrypt)
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{
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n2l(ivec,tout0);
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n2l(ivec,tout1);
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ivec-=8;
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for (l-=8; l>=0; l-=8)
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{
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n2l(in,tin0);
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n2l(in,tin1);
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tin0^=tout0;
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tin1^=tout1;
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tin[0]=tin0;
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tin[1]=tin1;
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BF_encrypt(tin,schedule);
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tout0=tin[0];
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tout1=tin[1];
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l2n(tout0,out);
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l2n(tout1,out);
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}
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if (l != -8)
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{
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n2ln(in,tin0,tin1,l+8);
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tin0^=tout0;
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tin1^=tout1;
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tin[0]=tin0;
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tin[1]=tin1;
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BF_encrypt(tin,schedule);
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tout0=tin[0];
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tout1=tin[1];
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l2n(tout0,out);
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l2n(tout1,out);
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}
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l2n(tout0,ivec);
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l2n(tout1,ivec);
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}
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else
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{
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n2l(ivec,xor0);
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n2l(ivec,xor1);
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ivec-=8;
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for (l-=8; l>=0; l-=8)
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{
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n2l(in,tin0);
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n2l(in,tin1);
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tin[0]=tin0;
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tin[1]=tin1;
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BF_decrypt(tin,schedule);
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tout0=tin[0]^xor0;
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tout1=tin[1]^xor1;
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l2n(tout0,out);
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l2n(tout1,out);
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xor0=tin0;
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xor1=tin1;
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}
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if (l != -8)
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{
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n2l(in,tin0);
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n2l(in,tin1);
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tin[0]=tin0;
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tin[1]=tin1;
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BF_decrypt(tin,schedule);
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tout0=tin[0]^xor0;
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tout1=tin[1]^xor1;
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l2nn(tout0,tout1,out,l+8);
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xor0=tin0;
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xor1=tin1;
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}
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l2n(xor0,ivec);
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l2n(xor1,ivec);
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}
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tin0=tin1=tout0=tout1=xor0=xor1=0;
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tin[0]=tin[1]=0;
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}
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#endif
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