source: trunk/cscrypt/i_cbc.c@ 3181

Last change on this file since 3181 was 3181, checked in by dingo35, 10 years ago

Adding threadsafety FIXMEs, feel free to join checking..

File size: 5.1 KB
Line 
1//FIXME Not checked on threadsafety yet; after checking please remove this line
2/* crypto/idea/i_cbc.c */
3/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * All rights reserved.
5 *
6 * This package is an SSL implementation written
7 * by Eric Young (eay@cryptsoft.com).
8 * The implementation was written so as to conform with Netscapes SSL.
9 *
10 * This library is free for commercial and non-commercial use as long as
11 * the following conditions are aheared to. The following conditions
12 * apply to all code found in this distribution, be it the RC4, RSA,
13 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
14 * included with this distribution is covered by the same copyright terms
15 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 *
17 * Copyright remains Eric Young's, and as such any Copyright notices in
18 * the code are not to be removed.
19 * If this package is used in a product, Eric Young should be given attribution
20 * as the author of the parts of the library used.
21 * This can be in the form of a textual message at program startup or
22 * in documentation (online or textual) provided with the package.
23 *
24 * Redistribution and use in source and binary forms, with or without
25 * modification, are permitted provided that the following conditions
26 * are met:
27 * 1. Redistributions of source code must retain the copyright
28 * notice, this list of conditions and the following disclaimer.
29 * 2. Redistributions in binary form must reproduce the above copyright
30 * notice, this list of conditions and the following disclaimer in the
31 * documentation and/or other materials provided with the distribution.
32 * 3. All advertising materials mentioning features or use of this software
33 * must display the following acknowledgement:
34 * "This product includes cryptographic software written by
35 * Eric Young (eay@cryptsoft.com)"
36 * The word 'cryptographic' can be left out if the rouines from the library
37 * being used are not cryptographic related :-).
38 * 4. If you include any Windows specific code (or a derivative thereof) from
39 * the apps directory (application code) you must include an acknowledgement:
40 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 *
42 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
43 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
44 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
45 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
46 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
47 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
48 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
49 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
50 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
51 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * SUCH DAMAGE.
53 *
54 * The licence and distribution terms for any publically available version or
55 * derivative of this code cannot be changed. i.e. this code cannot simply be
56 * copied and put under another distribution licence
57 * [including the GNU Public Licence.]
58 */
59
60#include "idea.h"
61#include "idea_lcl.h"
62
63void idea_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
64 IDEA_KEY_SCHEDULE *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 n2l(iv,tout0);
74 n2l(iv,tout1);
75 iv-=8;
76 for (l-=8; l>=0; l-=8)
77 {
78 n2l(in,tin0);
79 n2l(in,tin1);
80 tin0^=tout0;
81 tin1^=tout1;
82 tin[0]=tin0;
83 tin[1]=tin1;
84 idea_encrypt(tin,ks);
85 tout0=tin[0]; l2n(tout0,out);
86 tout1=tin[1]; l2n(tout1,out);
87 }
88 if (l != -8)
89 {
90 n2ln(in,tin0,tin1,l+8);
91 tin0^=tout0;
92 tin1^=tout1;
93 tin[0]=tin0;
94 tin[1]=tin1;
95 idea_encrypt(tin,ks);
96 tout0=tin[0]; l2n(tout0,out);
97 tout1=tin[1]; l2n(tout1,out);
98 }
99 l2n(tout0,iv);
100 l2n(tout1,iv);
101 }
102 else
103 {
104 n2l(iv,xor0);
105 n2l(iv,xor1);
106 iv-=8;
107 for (l-=8; l>=0; l-=8)
108 {
109 n2l(in,tin0); tin[0]=tin0;
110 n2l(in,tin1); tin[1]=tin1;
111 idea_encrypt(tin,ks);
112 tout0=tin[0]^xor0;
113 tout1=tin[1]^xor1;
114 l2n(tout0,out);
115 l2n(tout1,out);
116 xor0=tin0;
117 xor1=tin1;
118 }
119 if (l != -8)
120 {
121 n2l(in,tin0); tin[0]=tin0;
122 n2l(in,tin1); tin[1]=tin1;
123 idea_encrypt(tin,ks);
124 tout0=tin[0]^xor0;
125 tout1=tin[1]^xor1;
126 l2nn(tout0,tout1,out,l+8);
127 xor0=tin0;
128 xor1=tin1;
129 }
130 l2n(xor0,iv);
131 l2n(xor1,iv);
132 }
133 tin0=tin1=tout0=tout1=xor0=xor1=0;
134 tin[0]=tin[1]=0;
135 }
136
137void idea_encrypt(unsigned long *d, IDEA_KEY_SCHEDULE *key)
138 {
139 register IDEA_INT *p;
140 register unsigned long x1,x2,x3,x4,t0,t1,ul;
141
142 x2=d[0];
143 x1=(x2>>16);
144 x4=d[1];
145 x3=(x4>>16);
146
147 p= &(key->data[0][0]);
148
149 E_IDEA(0);
150 E_IDEA(1);
151 E_IDEA(2);
152 E_IDEA(3);
153 E_IDEA(4);
154 E_IDEA(5);
155 E_IDEA(6);
156 E_IDEA(7);
157
158 x1&=0xffff;
159 idea_mul(x1,x1,*p,ul); p++;
160
161 t0= x3+ *(p++);
162 t1= x2+ *(p++);
163
164 x4&=0xffff;
165 idea_mul(x4,x4,*p,ul);
166
167 d[0]=(t0&0xffff)|((x1&0xffff)<<16);
168 d[1]=(x4&0xffff)|((t1&0xffff)<<16);
169 }
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