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