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1/* crypto/des/cfb_enc.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 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@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 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@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 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
59#include "e_os.h"
60#include "des_locl.h"
61
62/* The input and output are loaded in multiples of 8 bits.
63 * What this means is that if you hame numbits=12 and length=2
64 * the first 12 bits will be retrieved from the first byte and half
65 * the second. The second 12 bits will come from the 3rd and half the 4th
66 * byte.
67 */
68/* Until Aug 1 2003 this function did not correctly implement CFB-r, so it
69 * will not be compatible with any encryption prior to that date. Ben. */
70void DES_cfb_encrypt(const unsigned char *in, unsigned char *out, int numbits,
71 long length, DES_key_schedule *schedule, DES_cblock *ivec,
72 int enc)
73 {
74 register DES_LONG d0,d1,v0,v1;
75 register unsigned long l=length,n=(numbits+7)/8;
76 register int num=numbits,i;
77 DES_LONG ti[2];
78 unsigned char *iv;
79 unsigned char ovec[16];
80
81 if (num > 64) return;
82 iv = &(*ivec)[0];
83 c2l(iv,v0);
84 c2l(iv,v1);
85 if (enc)
86 {
87 while (l >= n)
88 {
89 l-=n;
90 ti[0]=v0;
91 ti[1]=v1;
92 DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT);
93 c2ln(in,d0,d1,n);
94 in+=n;
95 d0^=ti[0];
96 d1^=ti[1];
97 l2cn(d0,d1,out,n);
98 out+=n;
99 /* 30-08-94 - eay - changed because l>>32 and
100 * l<<32 are bad under gcc :-( */
101 if (num == 32)
102 { v0=v1; v1=d0; }
103 else if (num == 64)
104 { v0=d0; v1=d1; }
105 else
106 {
107 iv=&ovec[0];
108 l2c(v0,iv);
109 l2c(v1,iv);
110 l2c(d0,iv);
111 l2c(d1,iv);
112 /* shift ovec left most of the bits... */
113 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0));
114 /* now the remaining bits */
115 if(num%8 != 0)
116 for(i=0 ; i < 8 ; ++i)
117 {
118 ovec[i]<<=num%8;
119 ovec[i]|=ovec[i+1]>>(8-num%8);
120 }
121 iv=&ovec[0];
122 c2l(iv,v0);
123 c2l(iv,v1);
124 }
125 }
126 }
127 else
128 {
129 while (l >= n)
130 {
131 l-=n;
132 ti[0]=v0;
133 ti[1]=v1;
134 DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT);
135 c2ln(in,d0,d1,n);
136 in+=n;
137 /* 30-08-94 - eay - changed because l>>32 and
138 * l<<32 are bad under gcc :-( */
139 if (num == 32)
140 { v0=v1; v1=d0; }
141 else if (num == 64)
142 { v0=d0; v1=d1; }
143 else
144 {
145 iv=&ovec[0];
146 l2c(v0,iv);
147 l2c(v1,iv);
148 l2c(d0,iv);
149 l2c(d1,iv);
150 /* shift ovec left most of the bits... */
151 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0));
152 /* now the remaining bits */
153 if(num%8 != 0)
154 for(i=0 ; i < 8 ; ++i)
155 {
156 ovec[i]<<=num%8;
157 ovec[i]|=ovec[i+1]>>(8-num%8);
158 }
159 iv=&ovec[0];
160 c2l(iv,v0);
161 c2l(iv,v1);
162 }
163 d0^=ti[0];
164 d1^=ti[1];
165 l2cn(d0,d1,out,n);
166 out+=n;
167 }
168 }
169 iv = &(*ivec)[0];
170 l2c(v0,iv);
171 l2c(v1,iv);
172 v0=v1=d0=d1=ti[0]=ti[1]=0;
173 }
174
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