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1 : : /* crypto/rc2/rc2_skey.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/rc2.h>
60 : : #include "rc2_locl.h"
61 : :
62 : : static const unsigned char key_table[256]={
63 : : 0xd9,0x78,0xf9,0xc4,0x19,0xdd,0xb5,0xed,0x28,0xe9,0xfd,0x79,
64 : : 0x4a,0xa0,0xd8,0x9d,0xc6,0x7e,0x37,0x83,0x2b,0x76,0x53,0x8e,
65 : : 0x62,0x4c,0x64,0x88,0x44,0x8b,0xfb,0xa2,0x17,0x9a,0x59,0xf5,
66 : : 0x87,0xb3,0x4f,0x13,0x61,0x45,0x6d,0x8d,0x09,0x81,0x7d,0x32,
67 : : 0xbd,0x8f,0x40,0xeb,0x86,0xb7,0x7b,0x0b,0xf0,0x95,0x21,0x22,
68 : : 0x5c,0x6b,0x4e,0x82,0x54,0xd6,0x65,0x93,0xce,0x60,0xb2,0x1c,
69 : : 0x73,0x56,0xc0,0x14,0xa7,0x8c,0xf1,0xdc,0x12,0x75,0xca,0x1f,
70 : : 0x3b,0xbe,0xe4,0xd1,0x42,0x3d,0xd4,0x30,0xa3,0x3c,0xb6,0x26,
71 : : 0x6f,0xbf,0x0e,0xda,0x46,0x69,0x07,0x57,0x27,0xf2,0x1d,0x9b,
72 : : 0xbc,0x94,0x43,0x03,0xf8,0x11,0xc7,0xf6,0x90,0xef,0x3e,0xe7,
73 : : 0x06,0xc3,0xd5,0x2f,0xc8,0x66,0x1e,0xd7,0x08,0xe8,0xea,0xde,
74 : : 0x80,0x52,0xee,0xf7,0x84,0xaa,0x72,0xac,0x35,0x4d,0x6a,0x2a,
75 : : 0x96,0x1a,0xd2,0x71,0x5a,0x15,0x49,0x74,0x4b,0x9f,0xd0,0x5e,
76 : : 0x04,0x18,0xa4,0xec,0xc2,0xe0,0x41,0x6e,0x0f,0x51,0xcb,0xcc,
77 : : 0x24,0x91,0xaf,0x50,0xa1,0xf4,0x70,0x39,0x99,0x7c,0x3a,0x85,
78 : : 0x23,0xb8,0xb4,0x7a,0xfc,0x02,0x36,0x5b,0x25,0x55,0x97,0x31,
79 : : 0x2d,0x5d,0xfa,0x98,0xe3,0x8a,0x92,0xae,0x05,0xdf,0x29,0x10,
80 : : 0x67,0x6c,0xba,0xc9,0xd3,0x00,0xe6,0xcf,0xe1,0x9e,0xa8,0x2c,
81 : : 0x63,0x16,0x01,0x3f,0x58,0xe2,0x89,0xa9,0x0d,0x38,0x34,0x1b,
82 : : 0xab,0x33,0xff,0xb0,0xbb,0x48,0x0c,0x5f,0xb9,0xb1,0xcd,0x2e,
83 : : 0xc5,0xf3,0xdb,0x47,0xe5,0xa5,0x9c,0x77,0x0a,0xa6,0x20,0x68,
84 : : 0xfe,0x7f,0xc1,0xad,
85 : : };
86 : :
87 : : #if defined(_MSC_VER) && defined(_ARM_)
88 : : #pragma optimize("g",off)
89 : : #endif
90 : :
91 : : /* It has come to my attention that there are 2 versions of the RC2
92 : : * key schedule. One which is normal, and anther which has a hook to
93 : : * use a reduced key length.
94 : : * BSAFE uses the 'retarded' version. What I previously shipped is
95 : : * the same as specifying 1024 for the 'bits' parameter. Bsafe uses
96 : : * a version where the bits parameter is the same as len*8 */
97 : 80 : void RC2_set_key(RC2_KEY *key, int len, const unsigned char *data, int bits)
98 : : {
99 : : int i,j;
100 : : unsigned char *k;
101 : : RC2_INT *ki;
102 : : unsigned int c,d;
103 : :
104 : 80 : k= (unsigned char *)&(key->data[0]);
105 : 80 : *k=0; /* for if there is a zero length key */
106 : :
107 [ - + ]: 80 : if (len > 128) len=128;
108 [ + + ]: 80 : if (bits <= 0) bits=1024;
109 [ - + ]: 80 : if (bits > 1024) bits=1024;
110 : :
111 [ + + ]: 1262 : for (i=0; i<len; i++)
112 : 1182 : k[i]=data[i];
113 : :
114 : : /* expand table */
115 : 80 : d=k[len-1];
116 : 80 : j=0;
117 [ + + ]: 9138 : for (i=len; i < 128; i++,j++)
118 : : {
119 : 9058 : d=key_table[(k[j]+d)&0xff];
120 : 9058 : k[i]=d;
121 : : }
122 : :
123 : : /* hmm.... key reduction to 'bits' bits */
124 : :
125 : 80 : j=(bits+7)>>3;
126 : 80 : i=128-j;
127 : 80 : c= (0xff>>(-bits & 0x07));
128 : :
129 : 80 : d=key_table[k[i]&c];
130 : 80 : k[i]=d;
131 [ + + ]: 8668 : while (i--)
132 : : {
133 : 8588 : d=key_table[k[i+j]^d];
134 : 8588 : k[i]=d;
135 : : }
136 : :
137 : : /* copy from bytes into RC2_INT's */
138 : 80 : ki= &(key->data[63]);
139 [ + + ]: 5200 : for (i=127; i>=0; i-=2)
140 : 5120 : *(ki--)=((k[i]<<8)|k[i-1])&0xffff;
141 : 80 : }
142 : :
143 : : #if defined(_MSC_VER)
144 : : #pragma optimize("",on)
145 : : #endif
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