bf_skey.c revision 296341 
1/* crypto/bf/bf_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 <stdio.h>
60#include <string.h>
61#include <openssl/crypto.h>
62#include <openssl/blowfish.h>
63#include "bf_locl.h"
64#include "bf_pi.h"
65
66void BF_set_key(BF_KEY *key, int len, const unsigned char *data)
67#ifdef OPENSSL_FIPS
68{
69    fips_cipher_abort(BLOWFISH);
70    private_BF_set_key(key, len, data);
71}
72
73void private_BF_set_key(BF_KEY *key, int len, const unsigned char *data)
74#endif
75{
76    int i;
77    BF_LONG *p, ri, in[2];
78    const unsigned char *d, *end;
79
80    memcpy(key, &bf_init, sizeof(BF_KEY));
81    p = key->P;
82
83    if (len > ((BF_ROUNDS + 2) * 4))
84        len = (BF_ROUNDS + 2) * 4;
85
86    d = data;
87    end = &(data[len]);
88    for (i = 0; i < (BF_ROUNDS + 2); i++) {
89        ri = *(d++);
90        if (d >= end)
91            d = data;
92
93        ri <<= 8;
94        ri |= *(d++);
95        if (d >= end)
96            d = data;
97
98        ri <<= 8;
99        ri |= *(d++);
100        if (d >= end)
101            d = data;
102
103        ri <<= 8;
104        ri |= *(d++);
105        if (d >= end)
106            d = data;
107
108        p[i] ^= ri;
109    }
110
111    in[0] = 0L;
112    in[1] = 0L;
113    for (i = 0; i < (BF_ROUNDS + 2); i += 2) {
114        BF_encrypt(in, key);
115        p[i] = in[0];
116        p[i + 1] = in[1];
117    }
118
119    p = key->S;
120    for (i = 0; i < 4 * 256; i += 2) {
121        BF_encrypt(in, key);
122        p[i] = in[0];
123        p[i + 1] = in[1];
124    }
125}
126