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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 "blowfish.h"
60#include "bf_locl.h"
61
62void BF_cbc_encrypt(in, out, length, ks, iv, encrypt)
63unsigned char *in;
64unsigned char *out;
65long length;
66BF_KEY *ks;
67unsigned char *iv;
68int encrypt;
69 {
70 register BF_LONG tin0,tin1;
71 register BF_LONG tout0,tout1,xor0,xor1;
72 register long l=length;
73 BF_LONG tin[2];
74
75 if (encrypt)
76 {
77 n2l(iv,tout0);
78 n2l(iv,tout1);
79 iv-=8;
80 for (l-=8; l>=0; l-=8)
81 {
82 n2l(in,tin0);
83 n2l(in,tin1);
84 tin0^=tout0;
85 tin1^=tout1;
86 tin[0]=tin0;
87 tin[1]=tin1;
88 BF_encrypt(tin,ks);
89 tout0=tin[0];
90 tout1=tin[1];
91 l2n(tout0,out);
92 l2n(tout1,out);
93 }
94 if (l != -8)
95 {
96 n2ln(in,tin0,tin1,l+8);
97 tin0^=tout0;
98 tin1^=tout1;
99 tin[0]=tin0;
100 tin[1]=tin1;
101 BF_encrypt(tin,ks);
102 tout0=tin[0];
103 tout1=tin[1];
104 l2n(tout0,out);
105 l2n(tout1,out);
106 }
107 l2n(tout0,iv);
108 l2n(tout1,iv);
109 }
110 else
111 {
112 n2l(iv,xor0);
113 n2l(iv,xor1);
114 iv-=8;
115 for (l-=8; l>=0; l-=8)
116 {
117 n2l(in,tin0);
118 n2l(in,tin1);
119 tin[0]=tin0;
120 tin[1]=tin1;
121 BF_decrypt(tin,ks);
122 tout0=tin[0]^xor0;
123 tout1=tin[1]^xor1;
124 l2n(tout0,out);
125 l2n(tout1,out);
126 xor0=tin0;
127 xor1=tin1;
128 }
129 if (l != -8)
130 {
131 n2l(in,tin0);
132 n2l(in,tin1);
133 tin[0]=tin0;
134 tin[1]=tin1;
135 BF_decrypt(tin,ks);
136 tout0=tin[0]^xor0;
137 tout1=tin[1]^xor1;
138 l2nn(tout0,tout1,out,l+8);
139 xor0=tin0;
140 xor1=tin1;
141 }
142 l2n(xor0,iv);
143 l2n(xor1,iv);
144 }
145 tin0=tin1=tout0=tout1=xor0=xor1=0;
146 tin[0]=tin[1]=0;
147 }
148
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