Line data Source code
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/crypto.h>
60 : #include <openssl/rc2.h>
61 : #include "rc2_locl.h"
62 :
63 : static const unsigned char key_table[256] = {
64 : 0xd9, 0x78, 0xf9, 0xc4, 0x19, 0xdd, 0xb5, 0xed, 0x28, 0xe9, 0xfd, 0x79,
65 : 0x4a, 0xa0, 0xd8, 0x9d, 0xc6, 0x7e, 0x37, 0x83, 0x2b, 0x76, 0x53, 0x8e,
66 : 0x62, 0x4c, 0x64, 0x88, 0x44, 0x8b, 0xfb, 0xa2, 0x17, 0x9a, 0x59, 0xf5,
67 : 0x87, 0xb3, 0x4f, 0x13, 0x61, 0x45, 0x6d, 0x8d, 0x09, 0x81, 0x7d, 0x32,
68 : 0xbd, 0x8f, 0x40, 0xeb, 0x86, 0xb7, 0x7b, 0x0b, 0xf0, 0x95, 0x21, 0x22,
69 : 0x5c, 0x6b, 0x4e, 0x82, 0x54, 0xd6, 0x65, 0x93, 0xce, 0x60, 0xb2, 0x1c,
70 : 0x73, 0x56, 0xc0, 0x14, 0xa7, 0x8c, 0xf1, 0xdc, 0x12, 0x75, 0xca, 0x1f,
71 : 0x3b, 0xbe, 0xe4, 0xd1, 0x42, 0x3d, 0xd4, 0x30, 0xa3, 0x3c, 0xb6, 0x26,
72 : 0x6f, 0xbf, 0x0e, 0xda, 0x46, 0x69, 0x07, 0x57, 0x27, 0xf2, 0x1d, 0x9b,
73 : 0xbc, 0x94, 0x43, 0x03, 0xf8, 0x11, 0xc7, 0xf6, 0x90, 0xef, 0x3e, 0xe7,
74 : 0x06, 0xc3, 0xd5, 0x2f, 0xc8, 0x66, 0x1e, 0xd7, 0x08, 0xe8, 0xea, 0xde,
75 : 0x80, 0x52, 0xee, 0xf7, 0x84, 0xaa, 0x72, 0xac, 0x35, 0x4d, 0x6a, 0x2a,
76 : 0x96, 0x1a, 0xd2, 0x71, 0x5a, 0x15, 0x49, 0x74, 0x4b, 0x9f, 0xd0, 0x5e,
77 : 0x04, 0x18, 0xa4, 0xec, 0xc2, 0xe0, 0x41, 0x6e, 0x0f, 0x51, 0xcb, 0xcc,
78 : 0x24, 0x91, 0xaf, 0x50, 0xa1, 0xf4, 0x70, 0x39, 0x99, 0x7c, 0x3a, 0x85,
79 : 0x23, 0xb8, 0xb4, 0x7a, 0xfc, 0x02, 0x36, 0x5b, 0x25, 0x55, 0x97, 0x31,
80 : 0x2d, 0x5d, 0xfa, 0x98, 0xe3, 0x8a, 0x92, 0xae, 0x05, 0xdf, 0x29, 0x10,
81 : 0x67, 0x6c, 0xba, 0xc9, 0xd3, 0x00, 0xe6, 0xcf, 0xe1, 0x9e, 0xa8, 0x2c,
82 : 0x63, 0x16, 0x01, 0x3f, 0x58, 0xe2, 0x89, 0xa9, 0x0d, 0x38, 0x34, 0x1b,
83 : 0xab, 0x33, 0xff, 0xb0, 0xbb, 0x48, 0x0c, 0x5f, 0xb9, 0xb1, 0xcd, 0x2e,
84 : 0xc5, 0xf3, 0xdb, 0x47, 0xe5, 0xa5, 0x9c, 0x77, 0x0a, 0xa6, 0x20, 0x68,
85 : 0xfe, 0x7f, 0xc1, 0xad,
86 : };
87 :
88 : #if defined(_MSC_VER) && defined(_ARM_)
89 : # pragma optimize("g",off)
90 : #endif
91 :
92 : /*
93 : * It has come to my attention that there are 2 versions of the RC2 key
94 : * schedule. One which is normal, and anther which has a hook to use a
95 : * reduced key length. BSAFE uses the 'retarded' version. What I previously
96 : * shipped is the same as specifying 1024 for the 'bits' parameter. Bsafe
97 : * uses a version where the bits parameter is the same as len*8
98 : */
99 0 : void RC2_set_key(RC2_KEY *key, int len, const unsigned char *data, int bits)
100 : #ifdef OPENSSL_FIPS
101 : {
102 : fips_cipher_abort(RC2);
103 : private_RC2_set_key(key, len, data, bits);
104 : }
105 :
106 : void private_RC2_set_key(RC2_KEY *key, int len, const unsigned char *data,
107 : int bits)
108 : #endif
109 : {
110 : int i, j;
111 : unsigned char *k;
112 : RC2_INT *ki;
113 : unsigned int c, d;
114 :
115 0 : k = (unsigned char *)&(key->data[0]);
116 0 : *k = 0; /* for if there is a zero length key */
117 :
118 0 : if (len > 128)
119 : len = 128;
120 0 : if (bits <= 0)
121 : bits = 1024;
122 0 : if (bits > 1024)
123 : bits = 1024;
124 :
125 0 : for (i = 0; i < len; i++)
126 0 : k[i] = data[i];
127 :
128 : /* expand table */
129 0 : d = k[len - 1];
130 : j = 0;
131 0 : for (i = len; i < 128; i++, j++) {
132 0 : d = key_table[(k[j] + d) & 0xff];
133 0 : k[i] = d;
134 : }
135 :
136 : /* hmm.... key reduction to 'bits' bits */
137 :
138 0 : j = (bits + 7) >> 3;
139 0 : i = 128 - j;
140 0 : c = (0xff >> (-bits & 0x07));
141 :
142 0 : d = key_table[k[i] & c];
143 0 : k[i] = d;
144 0 : while (i--) {
145 0 : d = key_table[k[i + j] ^ d];
146 0 : k[i] = d;
147 : }
148 :
149 : /* copy from bytes into RC2_INT's */
150 0 : ki = &(key->data[63]);
151 0 : for (i = 127; i >= 0; i -= 2)
152 0 : *(ki--) = ((k[i] << 8) | k[i - 1]) & 0xffff;
153 0 : }
154 :
155 : #if defined(_MSC_VER)
156 : # pragma optimize("",on)
157 : #endif
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