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d02b48c6 | 1 | /* crypto/des/cfb_enc.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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 | ||
cf89b405 | 59 | #include "e_os.h" |
d02b48c6 RE |
60 | #include "des_locl.h" |
61 | ||
62 | /* The input and output are loaded in multiples of 8 bits. | |
63 | * What this means is that if you hame numbits=12 and length=2 | |
64 | * the first 12 bits will be retrieved from the first byte and half | |
65 | * the second. The second 12 bits will come from the 3rd and half the 4th | |
66 | * byte. | |
67 | */ | |
8c6336b0 AP |
68 | /* Until Aug 1 2003 this function did not correctly implement CFB-r, so it |
69 | * will not be compatible with any encryption prior to that date. Ben. */ | |
c2e4f17c | 70 | void DES_cfb_encrypt(const unsigned char *in, unsigned char *out, int numbits, |
8c6336b0 AP |
71 | long length, DES_key_schedule *schedule, DES_cblock *ivec, |
72 | int enc) | |
d02b48c6 | 73 | { |
8c6336b0 | 74 | register DES_LONG d0,d1,v0,v1; |
d02b48c6 | 75 | register unsigned long l=length; |
8c6336b0 | 76 | register int num=numbits,n=(numbits+7)/8,i; |
d02b48c6 RE |
77 | DES_LONG ti[2]; |
78 | unsigned char *iv; | |
8c6336b0 | 79 | unsigned char ovec[16]; |
d02b48c6 RE |
80 | |
81 | if (num > 64) return; | |
edf0bfb5 | 82 | iv = &(*ivec)[0]; |
d02b48c6 RE |
83 | c2l(iv,v0); |
84 | c2l(iv,v1); | |
85 | if (enc) | |
86 | { | |
6c430321 | 87 | while (l >= (unsigned long)n) |
d02b48c6 RE |
88 | { |
89 | l-=n; | |
90 | ti[0]=v0; | |
91 | ti[1]=v1; | |
c2e4f17c | 92 | DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT); |
d02b48c6 RE |
93 | c2ln(in,d0,d1,n); |
94 | in+=n; | |
8c6336b0 AP |
95 | d0^=ti[0]; |
96 | d1^=ti[1]; | |
d02b48c6 RE |
97 | l2cn(d0,d1,out,n); |
98 | out+=n; | |
99 | /* 30-08-94 - eay - changed because l>>32 and | |
100 | * l<<32 are bad under gcc :-( */ | |
101 | if (num == 32) | |
102 | { v0=v1; v1=d0; } | |
103 | else if (num == 64) | |
104 | { v0=d0; v1=d1; } | |
8c6336b0 | 105 | else |
d02b48c6 | 106 | { |
8c6336b0 AP |
107 | iv=&ovec[0]; |
108 | l2c(v0,iv); | |
109 | l2c(v1,iv); | |
110 | l2c(d0,iv); | |
111 | l2c(d1,iv); | |
112 | /* shift ovec left most of the bits... */ | |
113 | memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0)); | |
114 | /* now the remaining bits */ | |
115 | if(num%8 != 0) | |
116 | for(i=0 ; i < 8 ; ++i) | |
117 | { | |
118 | ovec[i]<<=num%8; | |
119 | ovec[i]|=ovec[i+1]>>(8-num%8); | |
120 | } | |
121 | iv=&ovec[0]; | |
122 | c2l(iv,v0); | |
123 | c2l(iv,v1); | |
d02b48c6 RE |
124 | } |
125 | } | |
126 | } | |
127 | else | |
128 | { | |
6c430321 | 129 | while (l >= (unsigned long)n) |
d02b48c6 RE |
130 | { |
131 | l-=n; | |
132 | ti[0]=v0; | |
133 | ti[1]=v1; | |
c2e4f17c | 134 | DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT); |
d02b48c6 RE |
135 | c2ln(in,d0,d1,n); |
136 | in+=n; | |
137 | /* 30-08-94 - eay - changed because l>>32 and | |
138 | * l<<32 are bad under gcc :-( */ | |
139 | if (num == 32) | |
140 | { v0=v1; v1=d0; } | |
141 | else if (num == 64) | |
142 | { v0=d0; v1=d1; } | |
8c6336b0 | 143 | else |
d02b48c6 | 144 | { |
8c6336b0 AP |
145 | iv=&ovec[0]; |
146 | l2c(v0,iv); | |
147 | l2c(v1,iv); | |
148 | l2c(d0,iv); | |
149 | l2c(d1,iv); | |
150 | /* shift ovec left most of the bits... */ | |
151 | memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0)); | |
152 | /* now the remaining bits */ | |
153 | if(num%8 != 0) | |
154 | for(i=0 ; i < 8 ; ++i) | |
155 | { | |
156 | ovec[i]<<=num%8; | |
157 | ovec[i]|=ovec[i+1]>>(8-num%8); | |
158 | } | |
159 | iv=&ovec[0]; | |
160 | c2l(iv,v0); | |
161 | c2l(iv,v1); | |
d02b48c6 | 162 | } |
8c6336b0 AP |
163 | d0^=ti[0]; |
164 | d1^=ti[1]; | |
d02b48c6 RE |
165 | l2cn(d0,d1,out,n); |
166 | out+=n; | |
167 | } | |
168 | } | |
edf0bfb5 | 169 | iv = &(*ivec)[0]; |
d02b48c6 RE |
170 | l2c(v0,iv); |
171 | l2c(v1,iv); | |
172 | v0=v1=d0=d1=ti[0]=ti[1]=0; | |
173 | } | |
174 |