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1/* crypto/des/cfb64ede.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 "des_locl.h"
60#include "e_os.h"
61
62/* The input and output encrypted as though 64bit cfb mode is being
63 * used. The extra state information to record how much of the
64 * 64bit block we have used is contained in *num;
65 */
66
67void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out,
68 long length, DES_key_schedule *ks1,
69 DES_key_schedule *ks2, DES_key_schedule *ks3,
70 DES_cblock *ivec, int *num, int enc)
71 {
72 register DES_LONG v0,v1;
73 register long l=length;
74 register int n= *num;
75 DES_LONG ti[2];
76 unsigned char *iv,c,cc;
77
78 iv=&(*ivec)[0];
79 if (enc)
80 {
81 while (l--)
82 {
83 if (n == 0)
84 {
85 c2l(iv,v0);
86 c2l(iv,v1);
87
88 ti[0]=v0;
89 ti[1]=v1;
90 DES_encrypt3(ti,ks1,ks2,ks3);
91 v0=ti[0];
92 v1=ti[1];
93
94 iv = &(*ivec)[0];
95 l2c(v0,iv);
96 l2c(v1,iv);
97 iv = &(*ivec)[0];
98 }
99 c= *(in++)^iv[n];
100 *(out++)=c;
101 iv[n]=c;
102 n=(n+1)&0x07;
103 }
104 }
105 else
106 {
107 while (l--)
108 {
109 if (n == 0)
110 {
111 c2l(iv,v0);
112 c2l(iv,v1);
113
114 ti[0]=v0;
115 ti[1]=v1;
116 DES_encrypt3(ti,ks1,ks2,ks3);
117 v0=ti[0];
118 v1=ti[1];
119
120 iv = &(*ivec)[0];
121 l2c(v0,iv);
122 l2c(v1,iv);
123 iv = &(*ivec)[0];
124 }
125 cc= *(in++);
126 c=iv[n];
127 iv[n]=cc;
128 *(out++)=c^cc;
129 n=(n+1)&0x07;
130 }
131 }
132 v0=v1=ti[0]=ti[1]=c=cc=0;
133 *num=n;
134 }
135
136#ifdef undef /* MACRO */
137void DES_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out, long length,
138 DES_key_schedule ks1, DES_key_schedule ks2, DES_cblock (*ivec),
139 int *num, int enc)
140 {
141 DES_ede3_cfb64_encrypt(in,out,length,ks1,ks2,ks1,ivec,num,enc);
142 }
143#endif
144
145/* This is compatible with the single key CFB-r for DES, even thought that's
146 * not what EVP needs.
147 */
148
149void DES_ede3_cfb_encrypt(const unsigned char *in,unsigned char *out,
150 int numbits,long length,DES_key_schedule *ks1,
151 DES_key_schedule *ks2,DES_key_schedule *ks3,
152 DES_cblock *ivec,int enc)
153 {
154 register DES_LONG d0,d1,v0,v1;
155 register unsigned long l=length,n=((unsigned int)numbits+7)/8;
156 register int num=numbits,i;
157 DES_LONG ti[2];
158 unsigned char *iv;
159 unsigned char ovec[16];
160
161 if (num > 64) return;
162 iv = &(*ivec)[0];
163 c2l(iv,v0);
164 c2l(iv,v1);
165 if (enc)
166 {
167 while (l >= n)
168 {
169 l-=n;
170 ti[0]=v0;
171 ti[1]=v1;
172 DES_encrypt3(ti,ks1,ks2,ks3);
173 c2ln(in,d0,d1,n);
174 in+=n;
175 d0^=ti[0];
176 d1^=ti[1];
177 l2cn(d0,d1,out,n);
178 out+=n;
179 /* 30-08-94 - eay - changed because l>>32 and
180 * l<<32 are bad under gcc :-( */
181 if (num == 32)
182 { v0=v1; v1=d0; }
183 else if (num == 64)
184 { v0=d0; v1=d1; }
185 else
186 {
187 iv=&ovec[0];
188 l2c(v0,iv);
189 l2c(v1,iv);
190 l2c(d0,iv);
191 l2c(d1,iv);
192 /* shift ovec left most of the bits... */
193 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0));
194 /* now the remaining bits */
195 if(num%8 != 0)
196 for(i=0 ; i < 8 ; ++i)
197 {
198 ovec[i]<<=num%8;
199 ovec[i]|=ovec[i+1]>>(8-num%8);
200 }
201 iv=&ovec[0];
202 c2l(iv,v0);
203 c2l(iv,v1);
204 }
205 }
206 }
207 else
208 {
209 while (l >= n)
210 {
211 l-=n;
212 ti[0]=v0;
213 ti[1]=v1;
214 DES_encrypt3(ti,ks1,ks2,ks3);
215 c2ln(in,d0,d1,n);
216 in+=n;
217 /* 30-08-94 - eay - changed because l>>32 and
218 * l<<32 are bad under gcc :-( */
219 if (num == 32)
220 { v0=v1; v1=d0; }
221 else if (num == 64)
222 { v0=d0; v1=d1; }
223 else
224 {
225 iv=&ovec[0];
226 l2c(v0,iv);
227 l2c(v1,iv);
228 l2c(d0,iv);
229 l2c(d1,iv);
230 /* shift ovec left most of the bits... */
231 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0));
232 /* now the remaining bits */
233 if(num%8 != 0)
234 for(i=0 ; i < 8 ; ++i)
235 {
236 ovec[i]<<=num%8;
237 ovec[i]|=ovec[i+1]>>(8-num%8);
238 }
239 iv=&ovec[0];
240 c2l(iv,v0);
241 c2l(iv,v1);
242 }
243 d0^=ti[0];
244 d1^=ti[1];
245 l2cn(d0,d1,out,n);
246 out+=n;
247 }
248 }
249 iv = &(*ivec)[0];
250 l2c(v0,iv);
251 l2c(v1,iv);
252 v0=v1=d0=d1=ti[0]=ti[1]=0;
253 }
254
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