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1 /*
2 * Copyright (c) 2000-2001,2011-2012,2014 Apple Inc. All Rights Reserved.
3 *
4 * The contents of this file constitute Original Code as defined in and are
5 * subject to the Apple Public Source License Version 1.2 (the 'License').
6 * You may not use this file except in compliance with the License. Please obtain
7 * a copy of the License at http://www.apple.com/publicsource and read it before
8 * using this file.
9 *
10 * This Original Code and all software distributed under the License are
11 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
12 * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
13 * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
14 * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
15 * specific language governing rights and limitations under the License.
16 */
17
18
19 /* crypto/rc2/rc2_cbc.c */
20 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
21 * All rights reserved.
22 *
23 * This package is an SSL implementation written
24 * by Eric Young (eay@cryptsoft.com).
25 * The implementation was written so as to conform with Netscapes SSL.
26 *
27 * This library is free for commercial and non-commercial use as long as
28 * the following conditions are aheared to. The following conditions
29 * apply to all code found in this distribution, be it the RC4, RSA,
30 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
31 * included with this distribution is covered by the same copyright terms
32 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
33 *
34 * Copyright remains Eric Young's, and as such any Copyright notices in
35 * the code are not to be removed.
36 * If this package is used in a product, Eric Young should be given attribution
37 * as the author of the parts of the library used.
38 * This can be in the form of a textual message at program startup or
39 * in documentation (online or textual) provided with the package.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 * 3. All advertising materials mentioning features or use of this software
50 * must display the following acknowledgement:
51 * "This product includes cryptographic software written by
52 * Eric Young (eay@cryptsoft.com)"
53 * The word 'cryptographic' can be left out if the rouines from the library
54 * being used are not cryptographic related :-).
55 * 4. If you include any Windows specific code (or a derivative thereof) from
56 * the apps directory (application code) you must include an acknowledgement:
57 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
58 *
59 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69 * SUCH DAMAGE.
70 *
71 * The licence and distribution terms for any publically available version or
72 * derivative of this code cannot be changed. i.e. this code cannot simply be
73 * copied and put under another distribution licence
74 * [including the GNU Public Licence.]
75 */
76
77 #include <openssl/rc2_legacy.h>
78 #include "rc2_locl.h"
79
80 #ifndef _OPENSSL_APPLE_CDSA_
81
82 void RC2_cbc_encrypt(unsigned char *in, unsigned char *out, long length,
83 RC2_KEY *ks, unsigned char *iv, int encrypt)
84 {
85 register unsigned long tin0,tin1;
86 register unsigned long tout0,tout1,xor0,xor1;
87 register long l=length;
88 unsigned long tin[2];
89
90 if (encrypt)
91 {
92 c2l(iv,tout0);
93 c2l(iv,tout1);
94 iv-=8;
95 for (l-=8; l>=0; l-=8)
96 {
97 c2l(in,tin0);
98 c2l(in,tin1);
99 tin0^=tout0;
100 tin1^=tout1;
101 tin[0]=tin0;
102 tin[1]=tin1;
103 RC2_encrypt(tin,ks);
104 tout0=tin[0]; l2c(tout0,out);
105 tout1=tin[1]; l2c(tout1,out);
106 }
107 if (l != -8)
108 {
109 c2ln(in,tin0,tin1,l+8);
110 tin0^=tout0;
111 tin1^=tout1;
112 tin[0]=tin0;
113 tin[1]=tin1;
114 RC2_encrypt(tin,ks);
115 tout0=tin[0]; l2c(tout0,out);
116 tout1=tin[1]; l2c(tout1,out);
117 }
118 l2c(tout0,iv);
119 l2c(tout1,iv);
120 }
121 else
122 {
123 c2l(iv,xor0);
124 c2l(iv,xor1);
125 iv-=8;
126 for (l-=8; l>=0; l-=8)
127 {
128 c2l(in,tin0); tin[0]=tin0;
129 c2l(in,tin1); tin[1]=tin1;
130 RC2_decrypt(tin,ks);
131 tout0=tin[0]^xor0;
132 tout1=tin[1]^xor1;
133 l2c(tout0,out);
134 l2c(tout1,out);
135 xor0=tin0;
136 xor1=tin1;
137 }
138 if (l != -8)
139 {
140 c2l(in,tin0); tin[0]=tin0;
141 c2l(in,tin1); tin[1]=tin1;
142 RC2_decrypt(tin,ks);
143 tout0=tin[0]^xor0;
144 tout1=tin[1]^xor1;
145 l2cn(tout0,tout1,out,l+8);
146 xor0=tin0;
147 xor1=tin1;
148 }
149 l2c(xor0,iv);
150 l2c(xor1,iv);
151 }
152 tin0=tin1=tout0=tout1=xor0=xor1=0;
153 tin[0]=tin[1]=0;
154 }
155
156 #endif /* _OPENSSL_APPLE_CDSA_ */
157
158 #ifdef _OPENSSL_APPLE_CDSA_
159 void RC2_encrypt(RC2_INT *d, RC2_KEY *key)
160 #else
161 void RC2_encrypt(unsigned long *d, RC2_KEY *key)
162 #endif
163 {
164 int i,n;
165 register RC2_INT *p0,*p1;
166 register RC2_INT x0,x1,x2,x3,t;
167 unsigned long l;
168
169 l=d[0];
170 x0=(RC2_INT)l&0xffff;
171 x1=(RC2_INT)(l>>16L);
172 l=d[1];
173 x2=(RC2_INT)l&0xffff;
174 x3=(RC2_INT)(l>>16L);
175
176 n=3;
177 i=5;
178
179 p0=p1= &(key->data[0]);
180 for (;;)
181 {
182 t=(x0+(x1& ~x3)+(x2&x3)+ *(p0++))&0xffff;
183 x0=(t<<1)|(t>>15);
184 t=(x1+(x2& ~x0)+(x3&x0)+ *(p0++))&0xffff;
185 x1=(t<<2)|(t>>14);
186 t=(x2+(x3& ~x1)+(x0&x1)+ *(p0++))&0xffff;
187 x2=(t<<3)|(t>>13);
188 t=(x3+(x0& ~x2)+(x1&x2)+ *(p0++))&0xffff;
189 x3=(t<<5)|(t>>11);
190
191 if (--i == 0)
192 {
193 if (--n == 0) break;
194 i=(n == 2)?6:5;
195
196 x0+=p1[x3&0x3f];
197 x1+=p1[x0&0x3f];
198 x2+=p1[x1&0x3f];
199 x3+=p1[x2&0x3f];
200 }
201 }
202
203 d[0]=(RC2_INT)(x0&0xffff)|((RC2_INT)(x1&0xffff)<<16L);
204 d[1]=(RC2_INT)(x2&0xffff)|((RC2_INT)(x3&0xffff)<<16L);
205 }
206
207 #ifdef _OPENSSL_APPLE_CDSA_
208 void RC2_decrypt(RC2_INT *d, RC2_KEY *key)
209 #else
210 void RC2_decrypt(unsigned long *d, RC2_KEY *key)
211 #endif
212 {
213 int i,n;
214 register RC2_INT *p0,*p1;
215 register RC2_INT x0,x1,x2,x3,t;
216 unsigned long l;
217
218 l=d[0];
219 x0=(RC2_INT)l&0xffff;
220 x1=(RC2_INT)(l>>16L);
221 l=d[1];
222 x2=(RC2_INT)l&0xffff;
223 x3=(RC2_INT)(l>>16L);
224
225 n=3;
226 i=5;
227
228 p0= &(key->data[63]);
229 p1= &(key->data[0]);
230 for (;;)
231 {
232 t=((x3<<11)|(x3>>5))&0xffff;
233 x3=(t-(x0& ~x2)-(x1&x2)- *(p0--))&0xffff;
234 t=((x2<<13)|(x2>>3))&0xffff;
235 x2=(t-(x3& ~x1)-(x0&x1)- *(p0--))&0xffff;
236 t=((x1<<14)|(x1>>2))&0xffff;
237 x1=(t-(x2& ~x0)-(x3&x0)- *(p0--))&0xffff;
238 t=((x0<<15)|(x0>>1))&0xffff;
239 x0=(t-(x1& ~x3)-(x2&x3)- *(p0--))&0xffff;
240
241 if (--i == 0)
242 {
243 if (--n == 0) break;
244 i=(n == 2)?6:5;
245
246 x3=(x3-p1[x2&0x3f])&0xffff;
247 x2=(x2-p1[x1&0x3f])&0xffff;
248 x1=(x1-p1[x0&0x3f])&0xffff;
249 x0=(x0-p1[x3&0x3f])&0xffff;
250 }
251 }
252
253 d[0]=(RC2_INT)(x0&0xffff)|((RC2_INT)(x1&0xffff)<<16L);
254 d[1]=(RC2_INT)(x2&0xffff)|((RC2_INT)(x3&0xffff)<<16L);
255 }
256