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[openssl.git] / crypto / rc5 / rc5_enc.c
1 /* crypto/rc5/rc5_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 <stdio.h>
60 #include "rc5.h"
61 #include "rc5_locl.h"
62
63 void RC5_32_cbc_encrypt(in, out, length, ks, iv, encrypt)
64 unsigned char *in;
65 unsigned char *out;
66 long length;
67 RC5_32_KEY *ks;
68 unsigned char *iv;
69 int encrypt;
70         {
71         register unsigned long tin0,tin1;
72         register unsigned long tout0,tout1,xor0,xor1;
73         register long l=length;
74         unsigned long tin[2];
75
76         if (encrypt)
77                 {
78                 c2l(iv,tout0);
79                 c2l(iv,tout1);
80                 iv-=8;
81                 for (l-=8; l>=0; l-=8)
82                         {
83                         c2l(in,tin0);
84                         c2l(in,tin1);
85                         tin0^=tout0;
86                         tin1^=tout1;
87                         tin[0]=tin0;
88                         tin[1]=tin1;
89                         RC5_32_encrypt(tin,ks);
90                         tout0=tin[0]; l2c(tout0,out);
91                         tout1=tin[1]; l2c(tout1,out);
92                         }
93                 if (l != -8)
94                         {
95                         c2ln(in,tin0,tin1,l+8);
96                         tin0^=tout0;
97                         tin1^=tout1;
98                         tin[0]=tin0;
99                         tin[1]=tin1;
100                         RC5_32_encrypt(tin,ks);
101                         tout0=tin[0]; l2c(tout0,out);
102                         tout1=tin[1]; l2c(tout1,out);
103                         }
104                 l2c(tout0,iv);
105                 l2c(tout1,iv);
106                 }
107         else
108                 {
109                 c2l(iv,xor0);
110                 c2l(iv,xor1);
111                 iv-=8;
112                 for (l-=8; l>=0; l-=8)
113                         {
114                         c2l(in,tin0); tin[0]=tin0;
115                         c2l(in,tin1); tin[1]=tin1;
116                         RC5_32_decrypt(tin,ks);
117                         tout0=tin[0]^xor0;
118                         tout1=tin[1]^xor1;
119                         l2c(tout0,out);
120                         l2c(tout1,out);
121                         xor0=tin0;
122                         xor1=tin1;
123                         }
124                 if (l != -8)
125                         {
126                         c2l(in,tin0); tin[0]=tin0;
127                         c2l(in,tin1); tin[1]=tin1;
128                         RC5_32_decrypt(tin,ks);
129                         tout0=tin[0]^xor0;
130                         tout1=tin[1]^xor1;
131                         l2cn(tout0,tout1,out,l+8);
132                         xor0=tin0;
133                         xor1=tin1;
134                         }
135                 l2c(xor0,iv);
136                 l2c(xor1,iv);
137                 }
138         tin0=tin1=tout0=tout1=xor0=xor1=0;
139         tin[0]=tin[1]=0;
140         }
141
142 void RC5_32_encrypt(d,key)
143 unsigned long *d;
144 RC5_32_KEY *key;
145         {
146         RC5_32_INT a,b,*s;
147
148         s=key->data;
149
150         a=d[0]+s[0];
151         b=d[1]+s[1];
152         E_RC5_32(a,b,s, 2);
153         E_RC5_32(a,b,s, 4);
154         E_RC5_32(a,b,s, 6);
155         E_RC5_32(a,b,s, 8);
156         E_RC5_32(a,b,s,10);
157         E_RC5_32(a,b,s,12);
158         E_RC5_32(a,b,s,14);
159         E_RC5_32(a,b,s,16);
160         if (key->rounds == 12)
161                 {
162                 E_RC5_32(a,b,s,18);
163                 E_RC5_32(a,b,s,20);
164                 E_RC5_32(a,b,s,22);
165                 E_RC5_32(a,b,s,24);
166                 }
167         else if (key->rounds == 16)
168                 {
169                 /* Do a full expansion to avoid a jump */
170                 E_RC5_32(a,b,s,18);
171                 E_RC5_32(a,b,s,20);
172                 E_RC5_32(a,b,s,22);
173                 E_RC5_32(a,b,s,24);
174                 E_RC5_32(a,b,s,26);
175                 E_RC5_32(a,b,s,28);
176                 E_RC5_32(a,b,s,30);
177                 E_RC5_32(a,b,s,32);
178                 }
179         d[0]=a;
180         d[1]=b;
181         }
182
183 void RC5_32_decrypt(d,key)
184 unsigned long *d;
185 RC5_32_KEY *key;
186         {
187         RC5_32_INT a,b,*s;
188
189         s=key->data;
190
191         a=d[0];
192         b=d[1];
193         if (key->rounds == 16) 
194                 {
195                 D_RC5_32(a,b,s,32);
196                 D_RC5_32(a,b,s,30);
197                 D_RC5_32(a,b,s,28);
198                 D_RC5_32(a,b,s,26);
199                 /* Do a full expansion to avoid a jump */
200                 D_RC5_32(a,b,s,24);
201                 D_RC5_32(a,b,s,22);
202                 D_RC5_32(a,b,s,20);
203                 D_RC5_32(a,b,s,18);
204                 }
205         else if (key->rounds == 12)
206                 {
207                 D_RC5_32(a,b,s,24);
208                 D_RC5_32(a,b,s,22);
209                 D_RC5_32(a,b,s,20);
210                 D_RC5_32(a,b,s,18);
211                 }
212         D_RC5_32(a,b,s,16);
213         D_RC5_32(a,b,s,14);
214         D_RC5_32(a,b,s,12);
215         D_RC5_32(a,b,s,10);
216         D_RC5_32(a,b,s, 8);
217         D_RC5_32(a,b,s, 6);
218         D_RC5_32(a,b,s, 4);
219         D_RC5_32(a,b,s, 2);
220         d[0]=a-s[0];
221         d[1]=b-s[1];
222         }
223