Line data Source code
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 <openssl/idea.h>
60 : #include "idea_lcl.h"
61 :
62 0 : void idea_cbc_encrypt(const unsigned char *in, unsigned char *out,
63 : long length, IDEA_KEY_SCHEDULE *ks, unsigned char *iv,
64 : 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 0 : if (encrypt) {
72 0 : n2l(iv, tout0);
73 0 : n2l(iv, tout1);
74 : iv -= 8;
75 0 : for (l -= 8; l >= 0; l -= 8) {
76 0 : n2l(in, tin0);
77 0 : n2l(in, tin1);
78 0 : tin0 ^= tout0;
79 0 : tin1 ^= tout1;
80 0 : tin[0] = tin0;
81 0 : tin[1] = tin1;
82 0 : idea_encrypt(tin, ks);
83 0 : tout0 = tin[0];
84 0 : l2n(tout0, out);
85 0 : tout1 = tin[1];
86 0 : l2n(tout1, out);
87 : }
88 0 : if (l != -8) {
89 0 : n2ln(in, tin0, tin1, l + 8);
90 0 : tin0 ^= tout0;
91 0 : tin1 ^= tout1;
92 0 : tin[0] = tin0;
93 0 : tin[1] = tin1;
94 0 : idea_encrypt(tin, ks);
95 0 : tout0 = tin[0];
96 0 : l2n(tout0, out);
97 0 : tout1 = tin[1];
98 0 : l2n(tout1, out);
99 : }
100 0 : l2n(tout0, iv);
101 0 : l2n(tout1, iv);
102 : } else {
103 0 : n2l(iv, xor0);
104 0 : n2l(iv, xor1);
105 : iv -= 8;
106 0 : for (l -= 8; l >= 0; l -= 8) {
107 0 : n2l(in, tin0);
108 0 : tin[0] = tin0;
109 0 : n2l(in, tin1);
110 0 : tin[1] = tin1;
111 0 : idea_encrypt(tin, ks);
112 0 : tout0 = tin[0] ^ xor0;
113 0 : tout1 = tin[1] ^ xor1;
114 0 : l2n(tout0, out);
115 0 : l2n(tout1, out);
116 : xor0 = tin0;
117 : xor1 = tin1;
118 : }
119 0 : if (l != -8) {
120 0 : n2l(in, tin0);
121 0 : tin[0] = tin0;
122 0 : n2l(in, tin1);
123 0 : tin[1] = tin1;
124 0 : idea_encrypt(tin, ks);
125 0 : tout0 = tin[0] ^ xor0;
126 0 : tout1 = tin[1] ^ xor1;
127 0 : l2nn(tout0, tout1, out, l + 8);
128 : xor0 = tin0;
129 : xor1 = tin1;
130 : }
131 0 : l2n(xor0, iv);
132 0 : l2n(xor1, iv);
133 : }
134 : tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
135 : tin[0] = tin[1] = 0;
136 0 : }
137 :
138 0 : void idea_encrypt(unsigned long *d, IDEA_KEY_SCHEDULE *key)
139 : {
140 : register IDEA_INT *p;
141 : register unsigned long x1, x2, x3, x4, t0, t1, ul;
142 :
143 0 : x2 = d[0];
144 0 : x1 = (x2 >> 16);
145 0 : x4 = d[1];
146 0 : x3 = (x4 >> 16);
147 :
148 : p = &(key->data[0][0]);
149 :
150 0 : E_IDEA(0);
151 0 : E_IDEA(1);
152 0 : E_IDEA(2);
153 0 : E_IDEA(3);
154 0 : E_IDEA(4);
155 0 : E_IDEA(5);
156 0 : E_IDEA(6);
157 0 : E_IDEA(7);
158 :
159 0 : x1 &= 0xffff;
160 0 : idea_mul(x1, x1, *p, ul);
161 : p++;
162 :
163 0 : t0 = x3 + *(p++);
164 0 : t1 = x2 + *(p++);
165 :
166 0 : x4 &= 0xffff;
167 0 : idea_mul(x4, x4, *p, ul);
168 :
169 0 : d[0] = (t0 & 0xffff) | ((x1 & 0xffff) << 16);
170 0 : d[1] = (x4 & 0xffff) | ((t1 & 0xffff) << 16);
171 0 : }
|