source: trunk/cscrypt/i_cbc.c@ 580

Last change on this file since 580 was 580, checked in by nightmann, 11 years ago

added idea support to cscrypt. Is needed for nagra-reader

File size: 5.0 KB
Line 
1/* crypto/idea/i_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 "idea.h"
60#include "idea_lcl.h"
61
62void idea_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
63 IDEA_KEY_SCHEDULE *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 n2l(iv,tout0);
73 n2l(iv,tout1);
74 iv-=8;
75 for (l-=8; l>=0; l-=8)
76 {
77 n2l(in,tin0);
78 n2l(in,tin1);
79 tin0^=tout0;
80 tin1^=tout1;
81 tin[0]=tin0;
82 tin[1]=tin1;
83 idea_encrypt(tin,ks);
84 tout0=tin[0]; l2n(tout0,out);
85 tout1=tin[1]; l2n(tout1,out);
86 }
87 if (l != -8)
88 {
89 n2ln(in,tin0,tin1,l+8);
90 tin0^=tout0;
91 tin1^=tout1;
92 tin[0]=tin0;
93 tin[1]=tin1;
94 idea_encrypt(tin,ks);
95 tout0=tin[0]; l2n(tout0,out);
96 tout1=tin[1]; l2n(tout1,out);
97 }
98 l2n(tout0,iv);
99 l2n(tout1,iv);
100 }
101 else
102 {
103 n2l(iv,xor0);
104 n2l(iv,xor1);
105 iv-=8;
106 for (l-=8; l>=0; l-=8)
107 {
108 n2l(in,tin0); tin[0]=tin0;
109 n2l(in,tin1); tin[1]=tin1;
110 idea_encrypt(tin,ks);
111 tout0=tin[0]^xor0;
112 tout1=tin[1]^xor1;
113 l2n(tout0,out);
114 l2n(tout1,out);
115 xor0=tin0;
116 xor1=tin1;
117 }
118 if (l != -8)
119 {
120 n2l(in,tin0); tin[0]=tin0;
121 n2l(in,tin1); tin[1]=tin1;
122 idea_encrypt(tin,ks);
123 tout0=tin[0]^xor0;
124 tout1=tin[1]^xor1;
125 l2nn(tout0,tout1,out,l+8);
126 xor0=tin0;
127 xor1=tin1;
128 }
129 l2n(xor0,iv);
130 l2n(xor1,iv);
131 }
132 tin0=tin1=tout0=tout1=xor0=xor1=0;
133 tin[0]=tin[1]=0;
134 }
135
136void idea_encrypt(unsigned long *d, IDEA_KEY_SCHEDULE *key)
137 {
138 register IDEA_INT *p;
139 register unsigned long x1,x2,x3,x4,t0,t1,ul;
140
141 x2=d[0];
142 x1=(x2>>16);
143 x4=d[1];
144 x3=(x4>>16);
145
146 p= &(key->data[0][0]);
147
148 E_IDEA(0);
149 E_IDEA(1);
150 E_IDEA(2);
151 E_IDEA(3);
152 E_IDEA(4);
153 E_IDEA(5);
154 E_IDEA(6);
155 E_IDEA(7);
156
157 x1&=0xffff;
158 idea_mul(x1,x1,*p,ul); p++;
159
160 t0= x3+ *(p++);
161 t1= x2+ *(p++);
162
163 x4&=0xffff;
164 idea_mul(x4,x4,*p,ul);
165
166 d[0]=(t0&0xffff)|((x1&0xffff)<<16);
167 d[1]=(x4&0xffff)|((t1&0xffff)<<16);
168 }
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