bf_cbc.c revision 296465 
1/* crypto/bf/bf_cbc.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/blowfish.h>
60#include "bf_locl.h"
61
62void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
63                    const BF_KEY *schedule, unsigned char *ivec, int encrypt)
64{
65    register BF_LONG tin0, tin1;
66    register BF_LONG tout0, tout1, xor0, xor1;
67    register long l = length;
68    BF_LONG tin[2];
69
70    if (encrypt) {
71        n2l(ivec, tout0);
72        n2l(ivec, tout1);
73        ivec -= 8;
74        for (l -= 8; l >= 0; l -= 8) {
75            n2l(in, tin0);
76            n2l(in, tin1);
77            tin0 ^= tout0;
78            tin1 ^= tout1;
79            tin[0] = tin0;
80            tin[1] = tin1;
81            BF_encrypt(tin, schedule);
82            tout0 = tin[0];
83            tout1 = tin[1];
84            l2n(tout0, out);
85            l2n(tout1, out);
86        }
87        if (l != -8) {
88            n2ln(in, tin0, tin1, l + 8);
89            tin0 ^= tout0;
90            tin1 ^= tout1;
91            tin[0] = tin0;
92            tin[1] = tin1;
93            BF_encrypt(tin, schedule);
94            tout0 = tin[0];
95            tout1 = tin[1];
96            l2n(tout0, out);
97            l2n(tout1, out);
98        }
99        l2n(tout0, ivec);
100        l2n(tout1, ivec);
101    } else {
102        n2l(ivec, xor0);
103        n2l(ivec, xor1);
104        ivec -= 8;
105        for (l -= 8; l >= 0; l -= 8) {
106            n2l(in, tin0);
107            n2l(in, tin1);
108            tin[0] = tin0;
109            tin[1] = tin1;
110            BF_decrypt(tin, schedule);
111            tout0 = tin[0] ^ xor0;
112            tout1 = tin[1] ^ xor1;
113            l2n(tout0, out);
114            l2n(tout1, out);
115            xor0 = tin0;
116            xor1 = tin1;
117        }
118        if (l != -8) {
119            n2l(in, tin0);
120            n2l(in, tin1);
121            tin[0] = tin0;
122            tin[1] = tin1;
123            BF_decrypt(tin, schedule);
124            tout0 = tin[0] ^ xor0;
125            tout1 = tin[1] ^ xor1;
126            l2nn(tout0, tout1, out, l + 8);
127            xor0 = tin0;
128            xor1 = tin1;
129        }
130        l2n(xor0, ivec);
131        l2n(xor1, ivec);
132    }
133    tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
134    tin[0] = tin[1] = 0;
135}
136