des_encrypt(data,ks,encrypt)1 /* crypto/des/des_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
59 #include "des_locl.h"
60
61 void des_encrypt(data, ks, encrypt)
62 DES_LONG *data;
63 des_key_schedule ks;
64 int encrypt;
65 {
66 register DES_LONG l,r,t,u;
67 #ifdef DES_PTR
68 register unsigned char *des_SP=(unsigned char *)des_SPtrans;
69 #endif
70 #ifndef DES_UNROLL
71 register int i;
72 #endif
73 register DES_LONG *s;
74
75 r=data[0];
76 l=data[1];
77
78 IP(r,l);
79 /* Things have been modified so that the initial rotate is
80 * done outside the loop. This required the
81 * des_SPtrans values in sp.h to be rotated 1 bit to the right.
82 * One perl script later and things have a 5% speed up on a sparc2.
83 * Thanks to Richard Outerbridge <71755.204@CompuServe.COM>
84 * for pointing this out. */
85 /* clear the top bits on machines with 8byte longs */
86 /* shift left by 2 */
87 r=ROTATE(r,29)&0xffffffffL;
88 l=ROTATE(l,29)&0xffffffffL;
89
90 s=(DES_LONG *)ks;
91 /* I don't know if it is worth the effort of loop unrolling the
92 * inner loop */
93 if (encrypt)
94 {
95 #ifdef DES_UNROLL
96 D_ENCRYPT(l,r, 0); /* 1 */
97 D_ENCRYPT(r,l, 2); /* 2 */
98 D_ENCRYPT(l,r, 4); /* 3 */
99 D_ENCRYPT(r,l, 6); /* 4 */
100 D_ENCRYPT(l,r, 8); /* 5 */
101 D_ENCRYPT(r,l,10); /* 6 */
102 D_ENCRYPT(l,r,12); /* 7 */
103 D_ENCRYPT(r,l,14); /* 8 */
104 D_ENCRYPT(l,r,16); /* 9 */
105 D_ENCRYPT(r,l,18); /* 10 */
106 D_ENCRYPT(l,r,20); /* 11 */
107 D_ENCRYPT(r,l,22); /* 12 */
108 D_ENCRYPT(l,r,24); /* 13 */
109 D_ENCRYPT(r,l,26); /* 14 */
110 D_ENCRYPT(l,r,28); /* 15 */
111 D_ENCRYPT(r,l,30); /* 16 */
112 #else
113 for (i=0; i<32; i+=8)
114 {
115 D_ENCRYPT(l,r,i+0); /* 1 */
116 D_ENCRYPT(r,l,i+2); /* 2 */
117 D_ENCRYPT(l,r,i+4); /* 3 */
118 D_ENCRYPT(r,l,i+6); /* 4 */
119 }
120 #endif
121 }
122 else
123 {
124 #ifdef DES_UNROLL
125 D_ENCRYPT(l,r,30); /* 16 */
126 D_ENCRYPT(r,l,28); /* 15 */
127 D_ENCRYPT(l,r,26); /* 14 */
128 D_ENCRYPT(r,l,24); /* 13 */
129 D_ENCRYPT(l,r,22); /* 12 */
130 D_ENCRYPT(r,l,20); /* 11 */
131 D_ENCRYPT(l,r,18); /* 10 */
132 D_ENCRYPT(r,l,16); /* 9 */
133 D_ENCRYPT(l,r,14); /* 8 */
134 D_ENCRYPT(r,l,12); /* 7 */
135 D_ENCRYPT(l,r,10); /* 6 */
136 D_ENCRYPT(r,l, 8); /* 5 */
137 D_ENCRYPT(l,r, 6); /* 4 */
138 D_ENCRYPT(r,l, 4); /* 3 */
139 D_ENCRYPT(l,r, 2); /* 2 */
140 D_ENCRYPT(r,l, 0); /* 1 */
141 #else
142 for (i=30; i>0; i-=8)
143 {
144 D_ENCRYPT(l,r,i-0); /* 16 */
145 D_ENCRYPT(r,l,i-2); /* 15 */
146 D_ENCRYPT(l,r,i-4); /* 14 */
147 D_ENCRYPT(r,l,i-6); /* 13 */
148 }
149 #endif
150 }
151
152 /* rotate and clear the top bits on machines with 8byte longs */
153 l=ROTATE(l,3)&0xffffffffL;
154 r=ROTATE(r,3)&0xffffffffL;
155
156 FP(r,l);
157 data[0]=l;
158 data[1]=r;
159 l=r=t=u=0;
160 }
161
162 void des_encrypt2(data, ks, encrypt)
163 DES_LONG *data;
164 des_key_schedule ks;
165 int encrypt;
166 {
167 register DES_LONG l,r,t,u;
168 #ifdef DES_PTR
169 register unsigned char *des_SP=(unsigned char *)des_SPtrans;
170 #endif
171 #ifndef DES_UNROLL
172 register int i;
173 #endif
174 register DES_LONG *s;
175
176 r=data[0];
177 l=data[1];
178
179 /* Things have been modified so that the initial rotate is
180 * done outside the loop. This required the
181 * des_SPtrans values in sp.h to be rotated 1 bit to the right.
182 * One perl script later and things have a 5% speed up on a sparc2.
183 * Thanks to Richard Outerbridge <71755.204@CompuServe.COM>
184 * for pointing this out. */
185 /* clear the top bits on machines with 8byte longs */
186 r=ROTATE(r,29)&0xffffffff;
187 l=ROTATE(l,29)&0xffffffff;
188
189 s=(DES_LONG *)ks;
190 /* I don't know if it is worth the effort of loop unrolling the
191 * inner loop */
192 if (encrypt)
193 {
194 #ifdef DES_UNROLL
195 D_ENCRYPT(l,r, 0); /* 1 */
196 D_ENCRYPT(r,l, 2); /* 2 */
197 D_ENCRYPT(l,r, 4); /* 3 */
198 D_ENCRYPT(r,l, 6); /* 4 */
199 D_ENCRYPT(l,r, 8); /* 5 */
200 D_ENCRYPT(r,l,10); /* 6 */
201 D_ENCRYPT(l,r,12); /* 7 */
202 D_ENCRYPT(r,l,14); /* 8 */
203 D_ENCRYPT(l,r,16); /* 9 */
204 D_ENCRYPT(r,l,18); /* 10 */
205 D_ENCRYPT(l,r,20); /* 11 */
206 D_ENCRYPT(r,l,22); /* 12 */
207 D_ENCRYPT(l,r,24); /* 13 */
208 D_ENCRYPT(r,l,26); /* 14 */
209 D_ENCRYPT(l,r,28); /* 15 */
210 D_ENCRYPT(r,l,30); /* 16 */
211 #else
212 for (i=0; i<32; i+=8)
213 {
214 D_ENCRYPT(l,r,i+0); /* 1 */
215 D_ENCRYPT(r,l,i+2); /* 2 */
216 D_ENCRYPT(l,r,i+4); /* 3 */
217 D_ENCRYPT(r,l,i+6); /* 4 */
218 }
219 #endif
220 }
221 else
222 {
223 #ifdef DES_UNROLL
224 D_ENCRYPT(l,r,30); /* 16 */
225 D_ENCRYPT(r,l,28); /* 15 */
226 D_ENCRYPT(l,r,26); /* 14 */
227 D_ENCRYPT(r,l,24); /* 13 */
228 D_ENCRYPT(l,r,22); /* 12 */
229 D_ENCRYPT(r,l,20); /* 11 */
230 D_ENCRYPT(l,r,18); /* 10 */
231 D_ENCRYPT(r,l,16); /* 9 */
232 D_ENCRYPT(l,r,14); /* 8 */
233 D_ENCRYPT(r,l,12); /* 7 */
234 D_ENCRYPT(l,r,10); /* 6 */
235 D_ENCRYPT(r,l, 8); /* 5 */
236 D_ENCRYPT(l,r, 6); /* 4 */
237 D_ENCRYPT(r,l, 4); /* 3 */
238 D_ENCRYPT(l,r, 2); /* 2 */
239 D_ENCRYPT(r,l, 0); /* 1 */
240 #else
241 for (i=30; i>0; i-=8)
242 {
243 D_ENCRYPT(l,r,i-0); /* 16 */
244 D_ENCRYPT(r,l,i-2); /* 15 */
245 D_ENCRYPT(l,r,i-4); /* 14 */
246 D_ENCRYPT(r,l,i-6); /* 13 */
247 }
248 #endif
249 }
250 /* rotate and clear the top bits on machines with 8byte longs */
251 data[0]=ROTATE(l,3)&0xffffffff;
252 data[1]=ROTATE(r,3)&0xffffffff;
253 l=r=t=u=0;
254 }
255
256 void des_encrypt3(data,ks1,ks2,ks3)
257 DES_LONG *data;
258 des_key_schedule ks1;
259 des_key_schedule ks2;
260 des_key_schedule ks3;
261 {
262 register DES_LONG l,r;
263
264 l=data[0];
265 r=data[1];
266 IP(l,r);
267 data[0]=l;
268 data[1]=r;
269 des_encrypt2((DES_LONG *)data,ks1,DES_ENCRYPT);
270 des_encrypt2((DES_LONG *)data,ks2,DES_DECRYPT);
271 des_encrypt2((DES_LONG *)data,ks3,DES_ENCRYPT);
272 l=data[0];
273 r=data[1];
274 FP(r,l);
275 data[0]=l;
276 data[1]=r;
277 }
278
279 void des_decrypt3(data,ks1,ks2,ks3)
280 DES_LONG *data;
281 des_key_schedule ks1;
282 des_key_schedule ks2;
283 des_key_schedule ks3;
284 {
285 register DES_LONG l,r;
286
287 l=data[0];
288 r=data[1];
289 IP(l,r);
290 data[0]=l;
291 data[1]=r;
292 des_encrypt2((DES_LONG *)data,ks3,DES_DECRYPT);
293 des_encrypt2((DES_LONG *)data,ks2,DES_ENCRYPT);
294 des_encrypt2((DES_LONG *)data,ks1,DES_DECRYPT);
295 l=data[0];
296 r=data[1];
297 FP(r,l);
298 data[0]=l;
299 data[1]=r;
300 }
301
302