bf_enc.c revision 55009 
1/* crypto/bf/bf_enc.c */
2/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@mincom.oz.au).
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 aheared 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@mincom.oz.au).
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@mincom.oz.au)"
35 *    The word 'cryptographic' can be left out if the rouines 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@mincom.oz.au)"
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 publically 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 * $FreeBSD: head/sys/crypto/blowfish/bf_enc.c 55009 1999-12-22 19:13:38Z shin $
59 */
60
61#include <crypto/blowfish/blowfish.h>
62#include <crypto/blowfish/bf_locl.h>
63
64/* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
65 * (From LECTURE NOTES IN COIMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
66 * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
67 */
68
69#if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
70If you set BF_ROUNDS to some value other than 16 or 20, you will have
71to modify the code.
72#endif
73
74void BF_encrypt(data,key,encrypt)
75BF_LONG *data;
76BF_KEY *key;
77int encrypt;
78	{
79	register BF_LONG l,r,*p,*s;
80
81	p=key->P;
82	s= &(key->S[0]);
83	l=data[0];
84	r=data[1];
85
86	if (encrypt)
87		{
88		l^=p[0];
89		BF_ENC(r,l,s,p[ 1]);
90		BF_ENC(l,r,s,p[ 2]);
91		BF_ENC(r,l,s,p[ 3]);
92		BF_ENC(l,r,s,p[ 4]);
93		BF_ENC(r,l,s,p[ 5]);
94		BF_ENC(l,r,s,p[ 6]);
95		BF_ENC(r,l,s,p[ 7]);
96		BF_ENC(l,r,s,p[ 8]);
97		BF_ENC(r,l,s,p[ 9]);
98		BF_ENC(l,r,s,p[10]);
99		BF_ENC(r,l,s,p[11]);
100		BF_ENC(l,r,s,p[12]);
101		BF_ENC(r,l,s,p[13]);
102		BF_ENC(l,r,s,p[14]);
103		BF_ENC(r,l,s,p[15]);
104		BF_ENC(l,r,s,p[16]);
105#if BF_ROUNDS == 20
106		BF_ENC(r,l,s,p[17]);
107		BF_ENC(l,r,s,p[18]);
108		BF_ENC(r,l,s,p[19]);
109		BF_ENC(l,r,s,p[20]);
110#endif
111		r^=p[BF_ROUNDS+1];
112		}
113	else
114		{
115		l^=p[BF_ROUNDS+1];
116#if BF_ROUNDS == 20
117		BF_ENC(r,l,s,p[20]);
118		BF_ENC(l,r,s,p[19]);
119		BF_ENC(r,l,s,p[18]);
120		BF_ENC(l,r,s,p[17]);
121#endif
122		BF_ENC(r,l,s,p[16]);
123		BF_ENC(l,r,s,p[15]);
124		BF_ENC(r,l,s,p[14]);
125		BF_ENC(l,r,s,p[13]);
126		BF_ENC(r,l,s,p[12]);
127		BF_ENC(l,r,s,p[11]);
128		BF_ENC(r,l,s,p[10]);
129		BF_ENC(l,r,s,p[ 9]);
130		BF_ENC(r,l,s,p[ 8]);
131		BF_ENC(l,r,s,p[ 7]);
132		BF_ENC(r,l,s,p[ 6]);
133		BF_ENC(l,r,s,p[ 5]);
134		BF_ENC(r,l,s,p[ 4]);
135		BF_ENC(l,r,s,p[ 3]);
136		BF_ENC(r,l,s,p[ 2]);
137		BF_ENC(l,r,s,p[ 1]);
138		r^=p[0];
139		}
140	data[1]=l&0xffffffff;
141	data[0]=r&0xffffffff;
142	}
143