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d02b48c6 | 1 | /* crypto/idea/i_cbc.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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 | ||
62 | void idea_cbc_encrypt(in, out, length, ks, iv, encrypt) | |
63 | unsigned char *in; | |
64 | unsigned char *out; | |
65 | long length; | |
66 | IDEA_KEY_SCHEDULE *ks; | |
67 | unsigned char *iv; | |
68 | int encrypt; | |
69 | { | |
70 | register unsigned long tin0,tin1; | |
71 | register unsigned long tout0,tout1,xor0,xor1; | |
72 | register long l=length; | |
73 | unsigned long tin[2]; | |
74 | ||
75 | if (encrypt) | |
76 | { | |
77 | n2l(iv,tout0); | |
78 | n2l(iv,tout1); | |
79 | iv-=8; | |
80 | for (l-=8; l>=0; l-=8) | |
81 | { | |
82 | n2l(in,tin0); | |
83 | n2l(in,tin1); | |
84 | tin0^=tout0; | |
85 | tin1^=tout1; | |
86 | tin[0]=tin0; | |
87 | tin[1]=tin1; | |
88 | idea_encrypt(tin,ks); | |
89 | tout0=tin[0]; l2n(tout0,out); | |
90 | tout1=tin[1]; l2n(tout1,out); | |
91 | } | |
92 | if (l != -8) | |
93 | { | |
94 | n2ln(in,tin0,tin1,l+8); | |
95 | tin0^=tout0; | |
96 | tin1^=tout1; | |
97 | tin[0]=tin0; | |
98 | tin[1]=tin1; | |
99 | idea_encrypt(tin,ks); | |
100 | tout0=tin[0]; l2n(tout0,out); | |
101 | tout1=tin[1]; l2n(tout1,out); | |
102 | } | |
103 | l2n(tout0,iv); | |
104 | l2n(tout1,iv); | |
105 | } | |
106 | else | |
107 | { | |
108 | n2l(iv,xor0); | |
109 | n2l(iv,xor1); | |
110 | iv-=8; | |
111 | for (l-=8; l>=0; l-=8) | |
112 | { | |
113 | n2l(in,tin0); tin[0]=tin0; | |
114 | n2l(in,tin1); tin[1]=tin1; | |
115 | idea_encrypt(tin,ks); | |
116 | tout0=tin[0]^xor0; | |
117 | tout1=tin[1]^xor1; | |
118 | l2n(tout0,out); | |
119 | l2n(tout1,out); | |
120 | xor0=tin0; | |
121 | xor1=tin1; | |
122 | } | |
123 | if (l != -8) | |
124 | { | |
125 | n2l(in,tin0); tin[0]=tin0; | |
126 | n2l(in,tin1); tin[1]=tin1; | |
127 | idea_encrypt(tin,ks); | |
128 | tout0=tin[0]^xor0; | |
129 | tout1=tin[1]^xor1; | |
130 | l2nn(tout0,tout1,out,l+8); | |
131 | xor0=tin0; | |
132 | xor1=tin1; | |
133 | } | |
134 | l2n(xor0,iv); | |
135 | l2n(xor1,iv); | |
136 | } | |
137 | tin0=tin1=tout0=tout1=xor0=xor1=0; | |
138 | tin[0]=tin[1]=0; | |
139 | } | |
140 | ||
58964a49 RE |
141 | void idea_encrypt(d,key) |
142 | unsigned long *d; | |
143 | IDEA_KEY_SCHEDULE *key; | |
144 | { | |
145 | register IDEA_INT *p; | |
146 | register unsigned long x1,x2,x3,x4,t0,t1,ul; | |
147 | ||
148 | x2=d[0]; | |
149 | x1=(x2>>16); | |
150 | x4=d[1]; | |
151 | x3=(x4>>16); | |
152 | ||
153 | p= &(key->data[0][0]); | |
154 | ||
155 | E_IDEA(0); | |
156 | E_IDEA(1); | |
157 | E_IDEA(2); | |
158 | E_IDEA(3); | |
159 | E_IDEA(4); | |
160 | E_IDEA(5); | |
161 | E_IDEA(6); | |
162 | E_IDEA(7); | |
163 | ||
164 | x1&=0xffff; | |
165 | idea_mul(x1,x1,*p,ul); p++; | |
166 | ||
167 | t0= x3+ *(p++); | |
168 | t1= x2+ *(p++); | |
169 | ||
170 | x4&=0xffff; | |
171 | idea_mul(x4,x4,*p,ul); | |
172 | ||
173 | d[0]=(t0&0xffff)|((x1&0xffff)<<16); | |
174 | d[1]=(x4&0xffff)|((t1&0xffff)<<16); | |
175 | } |