1 | /* $NetBSD: bf_cbc.c,v 1.12 2005/12/11 12:20:48 christos Exp $ */ |
2 | |
3 | /* crypto/bf/bf_cbc.c */ |
4 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
5 | * All rights reserved. |
6 | * |
7 | * This package is an SSL implementation written |
8 | * by Eric Young (eay@cryptsoft.com). |
9 | * The implementation was written so as to conform with Netscapes SSL. |
10 | * |
11 | * This library is free for commercial and non-commercial use as long as |
12 | * the following conditions are aheared to. The following conditions |
13 | * apply to all code found in this distribution, be it the RC4, RSA, |
14 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
15 | * included with this distribution is covered by the same copyright terms |
16 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
17 | * |
18 | * Copyright remains Eric Young's, and as such any Copyright notices in |
19 | * the code are not to be removed. |
20 | * If this package is used in a product, Eric Young should be given attribution |
21 | * as the author of the parts of the library used. |
22 | * This can be in the form of a textual message at program startup or |
23 | * in documentation (online or textual) provided with the package. |
24 | * |
25 | * Redistribution and use in source and binary forms, with or without |
26 | * modification, are permitted provided that the following conditions |
27 | * are met: |
28 | * 1. Redistributions of source code must retain the copyright |
29 | * notice, this list of conditions and the following disclaimer. |
30 | * 2. Redistributions in binary form must reproduce the above copyright |
31 | * notice, this list of conditions and the following disclaimer in the |
32 | * documentation and/or other materials provided with the distribution. |
33 | * 3. All advertising materials mentioning features or use of this software |
34 | * must display the following acknowledgement: |
35 | * "This product includes cryptographic software written by |
36 | * Eric Young (eay@cryptsoft.com)" |
37 | * The word 'cryptographic' can be left out if the rouines from the library |
38 | * being used are not cryptographic related :-). |
39 | * 4. If you include any Windows specific code (or a derivative thereof) from |
40 | * the apps directory (application code) you must include an acknowledgement: |
41 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
42 | * |
43 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
44 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
45 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
46 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
47 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
48 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
49 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
50 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
51 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
52 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
53 | * SUCH DAMAGE. |
54 | * |
55 | * The licence and distribution terms for any publically available version or |
56 | * derivative of this code cannot be changed. i.e. this code cannot simply be |
57 | * copied and put under another distribution licence |
58 | * [including the GNU Public Licence.] |
59 | */ |
60 | |
61 | #include <sys/cdefs.h> |
62 | __KERNEL_RCSID(0, "$NetBSD: bf_cbc.c,v 1.12 2005/12/11 12:20:48 christos Exp $" ); |
63 | |
64 | #include <sys/types.h> |
65 | |
66 | #include <crypto/blowfish/blowfish.h> |
67 | #include "bf_locl.h" |
68 | |
69 | void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, |
70 | const BF_KEY *schedule, unsigned char *ivec, int encrypt) |
71 | { |
72 | register BF_LONG tin0,tin1; |
73 | register BF_LONG tout0,tout1,xor0,xor1; |
74 | register long l=length; |
75 | BF_LONG tin[2]; |
76 | |
77 | if (encrypt) |
78 | { |
79 | n2l(ivec,tout0); |
80 | n2l(ivec,tout1); |
81 | ivec-=8; |
82 | for (l-=8; l>=0; l-=8) |
83 | { |
84 | n2l(in,tin0); |
85 | n2l(in,tin1); |
86 | tin0^=tout0; |
87 | tin1^=tout1; |
88 | tin[0]=tin0; |
89 | tin[1]=tin1; |
90 | BF_encrypt(tin,(const BF_KEY *)schedule); |
91 | tout0=tin[0]; |
92 | tout1=tin[1]; |
93 | l2n(tout0,out); |
94 | l2n(tout1,out); |
95 | } |
96 | if (l != -8) |
97 | { |
98 | n2ln(in,tin0,tin1,l+8); |
99 | tin0^=tout0; |
100 | tin1^=tout1; |
101 | tin[0]=tin0; |
102 | tin[1]=tin1; |
103 | BF_encrypt(tin,(const BF_KEY *)schedule); |
104 | tout0=tin[0]; |
105 | tout1=tin[1]; |
106 | l2n(tout0,out); |
107 | l2n(tout1,out); |
108 | } |
109 | l2n(tout0,ivec); |
110 | l2n(tout1,ivec); |
111 | } |
112 | else |
113 | { |
114 | n2l(ivec,xor0); |
115 | n2l(ivec,xor1); |
116 | ivec-=8; |
117 | for (l-=8; l>=0; l-=8) |
118 | { |
119 | n2l(in,tin0); |
120 | n2l(in,tin1); |
121 | tin[0]=tin0; |
122 | tin[1]=tin1; |
123 | BF_decrypt(tin,(const BF_KEY *)schedule); |
124 | tout0=tin[0]^xor0; |
125 | tout1=tin[1]^xor1; |
126 | l2n(tout0,out); |
127 | l2n(tout1,out); |
128 | xor0=tin0; |
129 | xor1=tin1; |
130 | } |
131 | if (l != -8) |
132 | { |
133 | n2l(in,tin0); |
134 | n2l(in,tin1); |
135 | tin[0]=tin0; |
136 | tin[1]=tin1; |
137 | BF_decrypt(tin,(const BF_KEY *)schedule); |
138 | tout0=tin[0]^xor0; |
139 | tout1=tin[1]^xor1; |
140 | l2nn(tout0,tout1,out,l+8); |
141 | xor0=tin0; |
142 | xor1=tin1; |
143 | } |
144 | l2n(xor0,ivec); |
145 | l2n(xor1,ivec); |
146 | } |
147 | tin0=tin1=tout0=tout1=xor0=xor1=0; |
148 | tin[0]=tin[1]=0; |
149 | } |
150 | |
151 | |