Line data Source code
1 : /* crypto/des/cfb64ede.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 : #include "e_os.h"
61 :
62 : /*
63 : * The input and output encrypted as though 64bit cfb mode is being used.
64 : * The extra state information to record how much of the 64bit block we have
65 : * used is contained in *num;
66 : */
67 :
68 0 : void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out,
69 : long length, DES_key_schedule *ks1,
70 : DES_key_schedule *ks2, DES_key_schedule *ks3,
71 : DES_cblock *ivec, int *num, int enc)
72 : {
73 : register DES_LONG v0, v1;
74 : register long l = length;
75 0 : register int n = *num;
76 : DES_LONG ti[2];
77 : unsigned char *iv, c, cc;
78 :
79 0 : iv = &(*ivec)[0];
80 0 : if (enc) {
81 0 : while (l--) {
82 0 : if (n == 0) {
83 0 : c2l(iv, v0);
84 0 : c2l(iv, v1);
85 :
86 0 : ti[0] = v0;
87 0 : ti[1] = v1;
88 0 : DES_encrypt3(ti, ks1, ks2, ks3);
89 0 : v0 = ti[0];
90 0 : v1 = ti[1];
91 :
92 : iv = &(*ivec)[0];
93 0 : l2c(v0, iv);
94 0 : l2c(v1, iv);
95 : iv = &(*ivec)[0];
96 : }
97 0 : c = *(in++) ^ iv[n];
98 0 : *(out++) = c;
99 0 : iv[n] = c;
100 0 : n = (n + 1) & 0x07;
101 : }
102 : } else {
103 0 : while (l--) {
104 0 : if (n == 0) {
105 0 : c2l(iv, v0);
106 0 : c2l(iv, v1);
107 :
108 0 : ti[0] = v0;
109 0 : ti[1] = v1;
110 0 : DES_encrypt3(ti, ks1, ks2, ks3);
111 0 : v0 = ti[0];
112 0 : v1 = ti[1];
113 :
114 : iv = &(*ivec)[0];
115 0 : l2c(v0, iv);
116 0 : l2c(v1, iv);
117 : iv = &(*ivec)[0];
118 : }
119 0 : cc = *(in++);
120 0 : c = iv[n];
121 0 : iv[n] = cc;
122 0 : *(out++) = c ^ cc;
123 0 : n = (n + 1) & 0x07;
124 : }
125 : }
126 : v0 = v1 = ti[0] = ti[1] = c = cc = 0;
127 0 : *num = n;
128 0 : }
129 :
130 : #ifdef undef /* MACRO */
131 : void DES_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out,
132 : long length, DES_key_schedule ks1,
133 : DES_key_schedule ks2, DES_cblock (*ivec),
134 : int *num, int enc)
135 : {
136 : DES_ede3_cfb64_encrypt(in, out, length, ks1, ks2, ks1, ivec, num, enc);
137 : }
138 : #endif
139 :
140 : /*
141 : * This is compatible with the single key CFB-r for DES, even thought that's
142 : * not what EVP needs.
143 : */
144 :
145 0 : void DES_ede3_cfb_encrypt(const unsigned char *in, unsigned char *out,
146 : int numbits, long length, DES_key_schedule *ks1,
147 : DES_key_schedule *ks2, DES_key_schedule *ks3,
148 : DES_cblock *ivec, int enc)
149 : {
150 : register DES_LONG d0, d1, v0, v1;
151 0 : register unsigned long l = length, n = ((unsigned int)numbits + 7) / 8;
152 : register int num = numbits, i;
153 : DES_LONG ti[2];
154 : unsigned char *iv;
155 : unsigned char ovec[16];
156 :
157 0 : if (num > 64)
158 0 : return;
159 : iv = &(*ivec)[0];
160 0 : c2l(iv, v0);
161 0 : c2l(iv, v1);
162 0 : if (enc) {
163 0 : while (l >= n) {
164 0 : l -= n;
165 0 : ti[0] = v0;
166 0 : ti[1] = v1;
167 0 : DES_encrypt3(ti, ks1, ks2, ks3);
168 0 : c2ln(in, d0, d1, n);
169 0 : in += n;
170 0 : d0 ^= ti[0];
171 0 : d1 ^= ti[1];
172 0 : l2cn(d0, d1, out, n);
173 0 : out += n;
174 : /*
175 : * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
176 : * gcc :-(
177 : */
178 0 : if (num == 32) {
179 : v0 = v1;
180 : v1 = d0;
181 0 : } else if (num == 64) {
182 : v0 = d0;
183 : v1 = d1;
184 : } else {
185 : iv = &ovec[0];
186 0 : l2c(v0, iv);
187 0 : l2c(v1, iv);
188 0 : l2c(d0, iv);
189 0 : l2c(d1, iv);
190 : /* shift ovec left most of the bits... */
191 0 : memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
192 : /* now the remaining bits */
193 0 : if (num % 8 != 0)
194 0 : for (i = 0; i < 8; ++i) {
195 0 : ovec[i] <<= num % 8;
196 0 : ovec[i] |= ovec[i + 1] >> (8 - num % 8);
197 : }
198 : iv = &ovec[0];
199 0 : c2l(iv, v0);
200 0 : c2l(iv, v1);
201 : }
202 : }
203 : } else {
204 0 : while (l >= n) {
205 0 : l -= n;
206 0 : ti[0] = v0;
207 0 : ti[1] = v1;
208 0 : DES_encrypt3(ti, ks1, ks2, ks3);
209 0 : c2ln(in, d0, d1, n);
210 0 : in += n;
211 : /*
212 : * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
213 : * gcc :-(
214 : */
215 0 : if (num == 32) {
216 : v0 = v1;
217 : v1 = d0;
218 0 : } else if (num == 64) {
219 : v0 = d0;
220 : v1 = d1;
221 : } else {
222 : iv = &ovec[0];
223 0 : l2c(v0, iv);
224 0 : l2c(v1, iv);
225 0 : l2c(d0, iv);
226 0 : l2c(d1, iv);
227 : /* shift ovec left most of the bits... */
228 0 : memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
229 : /* now the remaining bits */
230 0 : if (num % 8 != 0)
231 0 : for (i = 0; i < 8; ++i) {
232 0 : ovec[i] <<= num % 8;
233 0 : ovec[i] |= ovec[i + 1] >> (8 - num % 8);
234 : }
235 : iv = &ovec[0];
236 0 : c2l(iv, v0);
237 0 : c2l(iv, v1);
238 : }
239 0 : d0 ^= ti[0];
240 0 : d1 ^= ti[1];
241 0 : l2cn(d0, d1, out, n);
242 0 : out += n;
243 : }
244 : }
245 : iv = &(*ivec)[0];
246 0 : l2c(v0, iv);
247 0 : l2c(v1, iv);
248 : v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0;
249 : }
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