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authorryker <>1998-10-05 20:13:14 +0000
committerryker <>1998-10-05 20:13:14 +0000
commitaeeae06a79815dc190061534d47236cec09f9e32 (patch)
tree851692b9c2f9c04f077666855641900f19fdb217 /src/lib/libcrypto/des/cfb_enc.c
parenta4f79641824cbf9f60ca9d1168d1fcc46717a82a (diff)
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Import of SSLeay-0.9.0b with RSA and IDEA stubbed + OpenBSD build
functionality for shared libs. Note that routines such as sslv2_init and friends that use RSA will not work due to lack of RSA in this library. Needs documentation and help from ports for easy upgrade to full functionality where legally possible.
Diffstat (limited to 'src/lib/libcrypto/des/cfb_enc.c')
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1 files changed, 171 insertions, 0 deletions
diff --git a/src/lib/libcrypto/des/cfb_enc.c b/src/lib/libcrypto/des/cfb_enc.c
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1/* crypto/des/cfb_enc.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 "des_locl.h"
60
61/* The input and output are loaded in multiples of 8 bits.
62 * What this means is that if you hame numbits=12 and length=2
63 * the first 12 bits will be retrieved from the first byte and half
64 * the second. The second 12 bits will come from the 3rd and half the 4th
65 * byte.
66 */
67void des_cfb_encrypt(in, out, numbits, length, schedule, ivec, enc)
68unsigned char *in;
69unsigned char *out;
70int numbits;
71long length;
72des_key_schedule schedule;
73des_cblock (*ivec);
74int enc;
75 {
76 register DES_LONG d0,d1,v0,v1,n=(numbits+7)/8;
77 register DES_LONG mask0,mask1;
78 register unsigned long l=length;
79 register int num=numbits;
80 DES_LONG ti[2];
81 unsigned char *iv;
82
83 if (num > 64) return;
84 if (num > 32)
85 {
86 mask0=0xffffffffL;
87 if (num == 64)
88 mask1=mask0;
89 else mask1=(1L<<(num-32))-1;
90 }
91 else
92 {
93 if (num == 32)
94 mask0=0xffffffffL;
95 else mask0=(1L<<num)-1;
96 mask1=0x00000000L;
97 }
98
99 iv=(unsigned char *)ivec;
100 c2l(iv,v0);
101 c2l(iv,v1);
102 if (enc)
103 {
104 while (l >= n)
105 {
106 l-=n;
107 ti[0]=v0;
108 ti[1]=v1;
109 des_encrypt((DES_LONG *)ti,schedule,DES_ENCRYPT);
110 c2ln(in,d0,d1,n);
111 in+=n;
112 d0=(d0^ti[0])&mask0;
113 d1=(d1^ti[1])&mask1;
114 l2cn(d0,d1,out,n);
115 out+=n;
116 /* 30-08-94 - eay - changed because l>>32 and
117 * l<<32 are bad under gcc :-( */
118 if (num == 32)
119 { v0=v1; v1=d0; }
120 else if (num == 64)
121 { v0=d0; v1=d1; }
122 else if (num > 32) /* && num != 64 */
123 {
124 v0=((v1>>(num-32))|(d0<<(64-num)))&0xffffffffL;
125 v1=((d0>>(num-32))|(d1<<(64-num)))&0xffffffffL;
126 }
127 else /* num < 32 */
128 {
129 v0=((v0>>num)|(v1<<(32-num)))&0xffffffffL;
130 v1=((v1>>num)|(d0<<(32-num)))&0xffffffffL;
131 }
132 }
133 }
134 else
135 {
136 while (l >= n)
137 {
138 l-=n;
139 ti[0]=v0;
140 ti[1]=v1;
141 des_encrypt((DES_LONG *)ti,schedule,DES_ENCRYPT);
142 c2ln(in,d0,d1,n);
143 in+=n;
144 /* 30-08-94 - eay - changed because l>>32 and
145 * l<<32 are bad under gcc :-( */
146 if (num == 32)
147 { v0=v1; v1=d0; }
148 else if (num == 64)
149 { v0=d0; v1=d1; }
150 else if (num > 32) /* && num != 64 */
151 {
152 v0=((v1>>(num-32))|(d0<<(64-num)))&0xffffffffL;
153 v1=((d0>>(num-32))|(d1<<(64-num)))&0xffffffffL;
154 }
155 else /* num < 32 */
156 {
157 v0=((v0>>num)|(v1<<(32-num)))&0xffffffffL;
158 v1=((v1>>num)|(d0<<(32-num)))&0xffffffffL;
159 }
160 d0=(d0^ti[0])&mask0;
161 d1=(d1^ti[1])&mask1;
162 l2cn(d0,d1,out,n);
163 out+=n;
164 }
165 }
166 iv=(unsigned char *)ivec;
167 l2c(v0,iv);
168 l2c(v1,iv);
169 v0=v1=d0=d1=ti[0]=ti[1]=0;
170 }
171