summaryrefslogtreecommitdiff
path: root/src/lib/libcrypto/des/cfb_enc.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/lib/libcrypto/des/cfb_enc.c')
-rw-r--r--src/lib/libcrypto/des/cfb_enc.c175
1 files changed, 175 insertions, 0 deletions
diff --git a/src/lib/libcrypto/des/cfb_enc.c b/src/lib/libcrypto/des/cfb_enc.c
new file mode 100644
index 0000000000..2600bdfc93
--- /dev/null
+++ b/src/lib/libcrypto/des/cfb_enc.c
@@ -0,0 +1,175 @@
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 */
67/* WARNING WARNING: this uses in and out in 8-byte chunks regardless of
68 * length */
69/* Until Aug 1 2003 this function did not correctly implement CFB-r, so it
70 * will not be compatible with any encryption prior to that date. Ben. */
71void DES_cfb_encrypt(const unsigned char *in, unsigned char *out, int numbits,
72 long length, DES_key_schedule *schedule, DES_cblock *ivec,
73 int enc)
74 {
75 register DES_LONG d0,d1,v0,v1,n=(numbits+7)/8;
76 register unsigned long l=length;
77 register int num=numbits;
78 DES_LONG ti[2];
79 unsigned char *iv;
80 unsigned char ovec[16];
81
82 if (num > 64) return;
83 iv = &(*ivec)[0];
84 c2l(iv,v0);
85 c2l(iv,v1);
86 if (enc)
87 {
88 while (l >= n)
89 {
90 l-=n;
91 ti[0]=v0;
92 ti[1]=v1;
93 DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT);
94 c2ln(in,d0,d1,n);
95 in+=n;
96 d0^=ti[0];
97 d1^=ti[1];
98 l2cn(d0,d1,out,n);
99 out+=n;
100 /* 30-08-94 - eay - changed because l>>32 and
101 * l<<32 are bad under gcc :-( */
102 if (num == 32)
103 { v0=v1; v1=d0; }
104 else if (num == 64)
105 { v0=d0; v1=d1; }
106 else
107 {
108 iv=&ovec[0];
109 l2c(v0,iv);
110 l2c(v1,iv);
111 l2c(d0,iv);
112 l2c(d1,iv);
113 /* shift ovec left most of the bits... */
114 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0));
115 /* now the remaining bits */
116 if(num%8 != 0)
117 for(n=0 ; n < 8 ; ++n)
118 {
119 ovec[n]<<=num%8;
120 ovec[n]|=ovec[n+1]>>(8-num%8);
121 }
122 iv=&ovec[0];
123 c2l(iv,v0);
124 c2l(iv,v1);
125 }
126 }
127 }
128 else
129 {
130 while (l >= n)
131 {
132 l-=n;
133 ti[0]=v0;
134 ti[1]=v1;
135 DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT);
136 c2ln(in,d0,d1,n);
137 in+=n;
138 /* 30-08-94 - eay - changed because l>>32 and
139 * l<<32 are bad under gcc :-( */
140 if (num == 32)
141 { v0=v1; v1=d0; }
142 else if (num == 64)
143 { v0=d0; v1=d1; }
144 else
145 {
146 iv=&ovec[0];
147 l2c(v0,iv);
148 l2c(v1,iv);
149 l2c(d0,iv);
150 l2c(d1,iv);
151 /* shift ovec left most of the bits... */
152 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0));
153 /* now the remaining bits */
154 if(num%8 != 0)
155 for(n=0 ; n < 8 ; ++n)
156 {
157 ovec[n]<<=num%8;
158 ovec[n]|=ovec[n+1]>>(8-num%8);
159 }
160 iv=&ovec[0];
161 c2l(iv,v0);
162 c2l(iv,v1);
163 }
164 d0^=ti[0];
165 d1^=ti[1];
166 l2cn(d0,d1,out,n);
167 out+=n;
168 }
169 }
170 iv = &(*ivec)[0];
171 l2c(v0,iv);
172 l2c(v1,iv);
173 v0=v1=d0=d1=ti[0]=ti[1]=0;
174 }
175
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-04-27 08:52:37 +0000