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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/idea/i_skey.c
1 /* crypto/idea/i_skey.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
63 static IDEA_INT
inverse(unsigned int xin
);
65 static IDEA_INT
inverse();
68 void idea_set_encrypt_key(key
, ks
)
70 IDEA_KEY_SCHEDULE
*ks
;
73 register IDEA_INT
*kt
,*kf
,r0
,r1
,r2
;
75 kt
= &(ks
->data
[0][0]);
76 n2s(key
,kt
[0]); n2s(key
,kt
[1]); n2s(key
,kt
[2]); n2s(key
,kt
[3]);
77 n2s(key
,kt
[4]); n2s(key
,kt
[5]); n2s(key
,kt
[6]); n2s(key
,kt
[7]);
85 *(kt
++)= ((r2
<<9) | (r1
>>7))&0xffff;
87 *(kt
++)= ((r1
<<9) | (r0
>>7))&0xffff;
89 *(kt
++)= ((r0
<<9) | (r1
>>7))&0xffff;
91 *(kt
++)= ((r1
<<9) | (r0
>>7))&0xffff;
93 *(kt
++)= ((r0
<<9) | (r1
>>7))&0xffff;
95 *(kt
++)= ((r1
<<9) | (r0
>>7))&0xffff;
98 *(kt
++)= ((r0
<<9) | (r1
>>7))&0xffff;
99 *(kt
++)= ((r1
<<9) | (r2
>>7))&0xffff;
104 void idea_set_decrypt_key(ek
, dk
)
105 IDEA_KEY_SCHEDULE
*ek
;
106 IDEA_KEY_SCHEDULE
*dk
;
109 register IDEA_INT
*fp
,*tp
,t
;
111 tp
= &(dk
->data
[0][0]);
112 fp
= &(ek
->data
[8][0]);
115 *(tp
++)=inverse(fp
[0]);
116 *(tp
++)=((int)(0x10000L
-fp
[2])&0xffff);
117 *(tp
++)=((int)(0x10000L
-fp
[1])&0xffff);
118 *(tp
++)=inverse(fp
[3]);
125 tp
= &(dk
->data
[0][0]);
135 /* taken directly from the 'paper' I'll have a look at it later */
136 static IDEA_INT
inverse(xin
)
139 long n1
,n2
,q
,r
,b1
,b2
,t
;
154 { if (b2
< 0) b2
=0x10001+b2
; }
165 return((IDEA_INT
)b2
);