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
BF_cbc_encrypt(const unsigned char * in,unsigned char * out,long length,const BF_KEY * schedule,unsigned char * ivec,int encrypt)62 void 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