Update from 0.9.8 stable. Eliminate duplicate error codes.
[openssl.git] / crypto / rc2 / rc2_cbc.c
1 /* crypto/rc2/rc2_cbc.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 <openssl/rc2.h>
60 #include "rc2_locl.h"
61
62 void RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
63              RC2_KEY *ks, unsigned char *iv, int encrypt)
64         {
65         register unsigned long tin0,tin1;
66         register unsigned long tout0,tout1,xor0,xor1;
67         register long l=length;
68         unsigned long tin[2];
69
70         if (encrypt)
71                 {
72                 c2l(iv,tout0);
73                 c2l(iv,tout1);
74                 iv-=8;
75                 for (l-=8; l>=0; l-=8)
76                         {
77                         c2l(in,tin0);
78                         c2l(in,tin1);
79                         tin0^=tout0;
80                         tin1^=tout1;
81                         tin[0]=tin0;
82                         tin[1]=tin1;
83                         RC2_encrypt(tin,ks);
84                         tout0=tin[0]; l2c(tout0,out);
85                         tout1=tin[1]; l2c(tout1,out);
86                         }
87                 if (l != -8)
88                         {
89                         c2ln(in,tin0,tin1,l+8);
90                         tin0^=tout0;
91                         tin1^=tout1;
92                         tin[0]=tin0;
93                         tin[1]=tin1;
94                         RC2_encrypt(tin,ks);
95                         tout0=tin[0]; l2c(tout0,out);
96                         tout1=tin[1]; l2c(tout1,out);
97                         }
98                 l2c(tout0,iv);
99                 l2c(tout1,iv);
100                 }
101         else
102                 {
103                 c2l(iv,xor0);
104                 c2l(iv,xor1);
105                 iv-=8;
106                 for (l-=8; l>=0; l-=8)
107                         {
108                         c2l(in,tin0); tin[0]=tin0;
109                         c2l(in,tin1); tin[1]=tin1;
110                         RC2_decrypt(tin,ks);
111                         tout0=tin[0]^xor0;
112                         tout1=tin[1]^xor1;
113                         l2c(tout0,out);
114                         l2c(tout1,out);
115                         xor0=tin0;
116                         xor1=tin1;
117                         }
118                 if (l != -8)
119                         {
120                         c2l(in,tin0); tin[0]=tin0;
121                         c2l(in,tin1); tin[1]=tin1;
122                         RC2_decrypt(tin,ks);
123                         tout0=tin[0]^xor0;
124                         tout1=tin[1]^xor1;
125                         l2cn(tout0,tout1,out,l+8);
126                         xor0=tin0;
127                         xor1=tin1;
128                         }
129                 l2c(xor0,iv);
130                 l2c(xor1,iv);
131                 }
132         tin0=tin1=tout0=tout1=xor0=xor1=0;
133         tin[0]=tin[1]=0;
134         }
135
136 void RC2_encrypt(unsigned long *d, RC2_KEY *key)
137         {
138         int i,n;
139         register RC2_INT *p0,*p1;
140         register RC2_INT x0,x1,x2,x3,t;
141         unsigned long l;
142
143         l=d[0];
144         x0=(RC2_INT)l&0xffff;
145         x1=(RC2_INT)(l>>16L);
146         l=d[1];
147         x2=(RC2_INT)l&0xffff;
148         x3=(RC2_INT)(l>>16L);
149
150         n=3;
151         i=5;
152
153         p0=p1= &(key->data[0]);
154         for (;;)
155                 {
156                 t=(x0+(x1& ~x3)+(x2&x3)+ *(p0++))&0xffff;
157                 x0=(t<<1)|(t>>15);
158                 t=(x1+(x2& ~x0)+(x3&x0)+ *(p0++))&0xffff;
159                 x1=(t<<2)|(t>>14);
160                 t=(x2+(x3& ~x1)+(x0&x1)+ *(p0++))&0xffff;
161                 x2=(t<<3)|(t>>13);
162                 t=(x3+(x0& ~x2)+(x1&x2)+ *(p0++))&0xffff;
163                 x3=(t<<5)|(t>>11);
164
165                 if (--i == 0)
166                         {
167                         if (--n == 0) break;
168                         i=(n == 2)?6:5;
169
170                         x0+=p1[x3&0x3f];
171                         x1+=p1[x0&0x3f];
172                         x2+=p1[x1&0x3f];
173                         x3+=p1[x2&0x3f];
174                         }
175                 }
176
177         d[0]=(unsigned long)(x0&0xffff)|((unsigned long)(x1&0xffff)<<16L);
178         d[1]=(unsigned long)(x2&0xffff)|((unsigned long)(x3&0xffff)<<16L);
179         }
180
181 void RC2_decrypt(unsigned long *d, RC2_KEY *key)
182         {
183         int i,n;
184         register RC2_INT *p0,*p1;
185         register RC2_INT x0,x1,x2,x3,t;
186         unsigned long l;
187
188         l=d[0];
189         x0=(RC2_INT)l&0xffff;
190         x1=(RC2_INT)(l>>16L);
191         l=d[1];
192         x2=(RC2_INT)l&0xffff;
193         x3=(RC2_INT)(l>>16L);
194
195         n=3;
196         i=5;
197
198         p0= &(key->data[63]);
199         p1= &(key->data[0]);
200         for (;;)
201                 {
202                 t=((x3<<11)|(x3>>5))&0xffff;
203                 x3=(t-(x0& ~x2)-(x1&x2)- *(p0--))&0xffff;
204                 t=((x2<<13)|(x2>>3))&0xffff;
205                 x2=(t-(x3& ~x1)-(x0&x1)- *(p0--))&0xffff;
206                 t=((x1<<14)|(x1>>2))&0xffff;
207                 x1=(t-(x2& ~x0)-(x3&x0)- *(p0--))&0xffff;
208                 t=((x0<<15)|(x0>>1))&0xffff;
209                 x0=(t-(x1& ~x3)-(x2&x3)- *(p0--))&0xffff;
210
211                 if (--i == 0)
212                         {
213                         if (--n == 0) break;
214                         i=(n == 2)?6:5;
215
216                         x3=(x3-p1[x2&0x3f])&0xffff;
217                         x2=(x2-p1[x1&0x3f])&0xffff;
218                         x1=(x1-p1[x0&0x3f])&0xffff;
219                         x0=(x0-p1[x3&0x3f])&0xffff;
220                         }
221                 }
222
223         d[0]=(unsigned long)(x0&0xffff)|((unsigned long)(x1&0xffff)<<16L);
224         d[1]=(unsigned long)(x2&0xffff)|((unsigned long)(x3&0xffff)<<16L);
225         }
226