fixed indentation
[strongswan.git] / src / libstrongswan / plugins / blowfish / bf_enc.c
1 /* crypto/bf/bf_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 "blowfish.h"
60 #include "bf_locl.h"
61
62 /* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
63 * (From LECTURE NOTES IN COMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
64 * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
65 */
66
67 #if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
68 #error If you set BF_ROUNDS to some value other than 16 or 20, you will have \
69 to modify the code.
70 #endif
71
72 void BF_encrypt(BF_LONG *data, const BF_KEY *key)
73 {
74 #ifndef BF_PTR2
75 const BF_LONG *p,*s;
76 BF_LONG l,r;
77
78 p=key->P;
79 s= &(key->S[0]);
80 l=data[0];
81 r=data[1];
82
83 l^=p[0];
84 BF_ENC(r,l,s,p[ 1]);
85 BF_ENC(l,r,s,p[ 2]);
86 BF_ENC(r,l,s,p[ 3]);
87 BF_ENC(l,r,s,p[ 4]);
88 BF_ENC(r,l,s,p[ 5]);
89 BF_ENC(l,r,s,p[ 6]);
90 BF_ENC(r,l,s,p[ 7]);
91 BF_ENC(l,r,s,p[ 8]);
92 BF_ENC(r,l,s,p[ 9]);
93 BF_ENC(l,r,s,p[10]);
94 BF_ENC(r,l,s,p[11]);
95 BF_ENC(l,r,s,p[12]);
96 BF_ENC(r,l,s,p[13]);
97 BF_ENC(l,r,s,p[14]);
98 BF_ENC(r,l,s,p[15]);
99 BF_ENC(l,r,s,p[16]);
100 #if BF_ROUNDS == 20
101 BF_ENC(r,l,s,p[17]);
102 BF_ENC(l,r,s,p[18]);
103 BF_ENC(r,l,s,p[19]);
104 BF_ENC(l,r,s,p[20]);
105 #endif
106 r^=p[BF_ROUNDS+1];
107
108 data[1]=l&0xffffffffL;
109 data[0]=r&0xffffffffL;
110 #else
111 BF_LONG l,r,t,*k;
112
113 l=data[0];
114 r=data[1];
115 k=(BF_LONG*)key;
116
117 l^=k[0];
118 BF_ENC(r,l,k, 1);
119 BF_ENC(l,r,k, 2);
120 BF_ENC(r,l,k, 3);
121 BF_ENC(l,r,k, 4);
122 BF_ENC(r,l,k, 5);
123 BF_ENC(l,r,k, 6);
124 BF_ENC(r,l,k, 7);
125 BF_ENC(l,r,k, 8);
126 BF_ENC(r,l,k, 9);
127 BF_ENC(l,r,k,10);
128 BF_ENC(r,l,k,11);
129 BF_ENC(l,r,k,12);
130 BF_ENC(r,l,k,13);
131 BF_ENC(l,r,k,14);
132 BF_ENC(r,l,k,15);
133 BF_ENC(l,r,k,16);
134 #if BF_ROUNDS == 20
135 BF_ENC(r,l,k,17);
136 BF_ENC(l,r,k,18);
137 BF_ENC(r,l,k,19);
138 BF_ENC(l,r,k,20);
139 #endif
140 r^=k[BF_ROUNDS+1];
141
142 data[1]=l&0xffffffffL;
143 data[0]=r&0xffffffffL;
144 #endif
145 }
146
147 #ifndef BF_DEFAULT_OPTIONS
148
149 void BF_decrypt(BF_LONG *data, const BF_KEY *key)
150 {
151 #ifndef BF_PTR2
152 const BF_LONG *p,*s;
153 BF_LONG l,r;
154
155 p=key->P;
156 s= &(key->S[0]);
157 l=data[0];
158 r=data[1];
159
160 l^=p[BF_ROUNDS+1];
161 #if BF_ROUNDS == 20
162 BF_ENC(r,l,s,p[20]);
163 BF_ENC(l,r,s,p[19]);
164 BF_ENC(r,l,s,p[18]);
165 BF_ENC(l,r,s,p[17]);
166 #endif
167 BF_ENC(r,l,s,p[16]);
168 BF_ENC(l,r,s,p[15]);
169 BF_ENC(r,l,s,p[14]);
170 BF_ENC(l,r,s,p[13]);
171 BF_ENC(r,l,s,p[12]);
172 BF_ENC(l,r,s,p[11]);
173 BF_ENC(r,l,s,p[10]);
174 BF_ENC(l,r,s,p[ 9]);
175 BF_ENC(r,l,s,p[ 8]);
176 BF_ENC(l,r,s,p[ 7]);
177 BF_ENC(r,l,s,p[ 6]);
178 BF_ENC(l,r,s,p[ 5]);
179 BF_ENC(r,l,s,p[ 4]);
180 BF_ENC(l,r,s,p[ 3]);
181 BF_ENC(r,l,s,p[ 2]);
182 BF_ENC(l,r,s,p[ 1]);
183 r^=p[0];
184
185 data[1]=l&0xffffffffL;
186 data[0]=r&0xffffffffL;
187 #else
188 BF_LONG l,r,t,*k;
189
190 l=data[0];
191 r=data[1];
192 k=(BF_LONG *)key;
193
194 l^=k[BF_ROUNDS+1];
195 #if BF_ROUNDS == 20
196 BF_ENC(r,l,k,20);
197 BF_ENC(l,r,k,19);
198 BF_ENC(r,l,k,18);
199 BF_ENC(l,r,k,17);
200 #endif
201 BF_ENC(r,l,k,16);
202 BF_ENC(l,r,k,15);
203 BF_ENC(r,l,k,14);
204 BF_ENC(l,r,k,13);
205 BF_ENC(r,l,k,12);
206 BF_ENC(l,r,k,11);
207 BF_ENC(r,l,k,10);
208 BF_ENC(l,r,k, 9);
209 BF_ENC(r,l,k, 8);
210 BF_ENC(l,r,k, 7);
211 BF_ENC(r,l,k, 6);
212 BF_ENC(l,r,k, 5);
213 BF_ENC(r,l,k, 4);
214 BF_ENC(l,r,k, 3);
215 BF_ENC(r,l,k, 2);
216 BF_ENC(l,r,k, 1);
217 r^=k[0];
218
219 data[1]=l&0xffffffffL;
220 data[0]=r&0xffffffffL;
221 #endif
222 }
223
224 void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
225 const BF_KEY *schedule, unsigned char *ivec, int encrypt)
226 {
227 BF_LONG tin0,tin1;
228 BF_LONG tout0,tout1,xor0,xor1;
229 long l=length;
230 BF_LONG tin[2];
231
232 if (encrypt)
233 {
234 n2l(ivec,tout0);
235 n2l(ivec,tout1);
236 ivec-=8;
237 for (l-=8; l>=0; l-=8)
238 {
239 n2l(in,tin0);
240 n2l(in,tin1);
241 tin0^=tout0;
242 tin1^=tout1;
243 tin[0]=tin0;
244 tin[1]=tin1;
245 BF_encrypt(tin,schedule);
246 tout0=tin[0];
247 tout1=tin[1];
248 l2n(tout0,out);
249 l2n(tout1,out);
250 }
251 if (l != -8)
252 {
253 n2ln(in,tin0,tin1,l+8);
254 tin0^=tout0;
255 tin1^=tout1;
256 tin[0]=tin0;
257 tin[1]=tin1;
258 BF_encrypt(tin,schedule);
259 tout0=tin[0];
260 tout1=tin[1];
261 l2n(tout0,out);
262 l2n(tout1,out);
263 }
264 l2n(tout0,ivec);
265 l2n(tout1,ivec);
266 }
267 else
268 {
269 n2l(ivec,xor0);
270 n2l(ivec,xor1);
271 ivec-=8;
272 for (l-=8; l>=0; l-=8)
273 {
274 n2l(in,tin0);
275 n2l(in,tin1);
276 tin[0]=tin0;
277 tin[1]=tin1;
278 BF_decrypt(tin,schedule);
279 tout0=tin[0]^xor0;
280 tout1=tin[1]^xor1;
281 l2n(tout0,out);
282 l2n(tout1,out);
283 xor0=tin0;
284 xor1=tin1;
285 }
286 if (l != -8)
287 {
288 n2l(in,tin0);
289 n2l(in,tin1);
290 tin[0]=tin0;
291 tin[1]=tin1;
292 BF_decrypt(tin,schedule);
293 tout0=tin[0]^xor0;
294 tout1=tin[1]^xor1;
295 l2nn(tout0,tout1,out,l+8);
296 xor0=tin0;
297 xor1=tin1;
298 }
299 l2n(xor0,ivec);
300 l2n(xor1,ivec);
301 }
302 tin0=tin1=tout0=tout1=xor0=xor1=0;
303 tin[0]=tin[1]=0;
304 }
305
306 #endif