]>
Commit | Line | Data |
---|---|---|
d02b48c6 | 1 | /* crypto/des/cfb64ede.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. | |
0f113f3e | 8 | * |
d02b48c6 RE |
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). | |
0f113f3e | 15 | * |
d02b48c6 RE |
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. | |
0f113f3e | 22 | * |
d02b48c6 RE |
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 :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
d02b48c6 RE |
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. | |
0f113f3e | 52 | * |
d02b48c6 RE |
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" | |
1a4b8e7c | 60 | #include "e_os.h" |
d02b48c6 | 61 | |
0f113f3e MC |
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; | |
d02b48c6 RE |
66 | */ |
67 | ||
c2e4f17c | 68 | void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out, |
0f113f3e MC |
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 | register int n = *num; | |
76 | DES_LONG ti[2]; | |
77 | unsigned char *iv, c, cc; | |
d02b48c6 | 78 | |
0f113f3e MC |
79 | iv = &(*ivec)[0]; |
80 | if (enc) { | |
81 | while (l--) { | |
82 | if (n == 0) { | |
83 | c2l(iv, v0); | |
84 | c2l(iv, v1); | |
d02b48c6 | 85 | |
0f113f3e MC |
86 | ti[0] = v0; |
87 | ti[1] = v1; | |
88 | DES_encrypt3(ti, ks1, ks2, ks3); | |
89 | v0 = ti[0]; | |
90 | v1 = ti[1]; | |
d02b48c6 | 91 | |
0f113f3e MC |
92 | iv = &(*ivec)[0]; |
93 | l2c(v0, iv); | |
94 | l2c(v1, iv); | |
95 | iv = &(*ivec)[0]; | |
96 | } | |
97 | c = *(in++) ^ iv[n]; | |
98 | *(out++) = c; | |
99 | iv[n] = c; | |
100 | n = (n + 1) & 0x07; | |
101 | } | |
102 | } else { | |
103 | while (l--) { | |
104 | if (n == 0) { | |
105 | c2l(iv, v0); | |
106 | c2l(iv, v1); | |
d02b48c6 | 107 | |
0f113f3e MC |
108 | ti[0] = v0; |
109 | ti[1] = v1; | |
110 | DES_encrypt3(ti, ks1, ks2, ks3); | |
111 | v0 = ti[0]; | |
112 | v1 = ti[1]; | |
d02b48c6 | 113 | |
0f113f3e MC |
114 | iv = &(*ivec)[0]; |
115 | l2c(v0, iv); | |
116 | l2c(v1, iv); | |
117 | iv = &(*ivec)[0]; | |
118 | } | |
119 | cc = *(in++); | |
120 | c = iv[n]; | |
121 | iv[n] = cc; | |
122 | *(out++) = c ^ cc; | |
123 | n = (n + 1) & 0x07; | |
124 | } | |
125 | } | |
126 | v0 = v1 = ti[0] = ti[1] = c = cc = 0; | |
127 | *num = n; | |
128 | } | |
d02b48c6 | 129 | |
0f113f3e MC |
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 | } | |
d02b48c6 | 138 | #endif |
8c6336b0 | 139 | |
0f113f3e MC |
140 | /* |
141 | * This is compatible with the single key CFB-r for DES, even thought that's | |
8c6336b0 AP |
142 | * not what EVP needs. |
143 | */ | |
144 | ||
0f113f3e MC |
145 | 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 | 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]; | |
8c6336b0 | 156 | |
0f113f3e MC |
157 | if (num > 64) |
158 | return; | |
159 | iv = &(*ivec)[0]; | |
160 | c2l(iv, v0); | |
161 | c2l(iv, v1); | |
162 | if (enc) { | |
163 | while (l >= n) { | |
164 | l -= n; | |
165 | ti[0] = v0; | |
166 | ti[1] = v1; | |
167 | DES_encrypt3(ti, ks1, ks2, ks3); | |
168 | c2ln(in, d0, d1, n); | |
169 | in += n; | |
170 | d0 ^= ti[0]; | |
171 | d1 ^= ti[1]; | |
172 | l2cn(d0, d1, out, n); | |
173 | out += n; | |
174 | /* | |
175 | * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under | |
176 | * gcc :-( | |
177 | */ | |
178 | if (num == 32) { | |
179 | v0 = v1; | |
180 | v1 = d0; | |
181 | } else if (num == 64) { | |
182 | v0 = d0; | |
183 | v1 = d1; | |
184 | } else { | |
185 | iv = &ovec[0]; | |
186 | l2c(v0, iv); | |
187 | l2c(v1, iv); | |
188 | l2c(d0, iv); | |
189 | l2c(d1, iv); | |
190 | /* shift ovec left most of the bits... */ | |
191 | memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0)); | |
192 | /* now the remaining bits */ | |
193 | if (num % 8 != 0) | |
194 | for (i = 0; i < 8; ++i) { | |
195 | ovec[i] <<= num % 8; | |
196 | ovec[i] |= ovec[i + 1] >> (8 - num % 8); | |
197 | } | |
198 | iv = &ovec[0]; | |
199 | c2l(iv, v0); | |
200 | c2l(iv, v1); | |
201 | } | |
202 | } | |
203 | } else { | |
204 | while (l >= n) { | |
205 | l -= n; | |
206 | ti[0] = v0; | |
207 | ti[1] = v1; | |
208 | DES_encrypt3(ti, ks1, ks2, ks3); | |
209 | c2ln(in, d0, d1, n); | |
210 | in += n; | |
211 | /* | |
212 | * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under | |
213 | * gcc :-( | |
214 | */ | |
215 | if (num == 32) { | |
216 | v0 = v1; | |
217 | v1 = d0; | |
218 | } else if (num == 64) { | |
219 | v0 = d0; | |
220 | v1 = d1; | |
221 | } else { | |
222 | iv = &ovec[0]; | |
223 | l2c(v0, iv); | |
224 | l2c(v1, iv); | |
225 | l2c(d0, iv); | |
226 | l2c(d1, iv); | |
227 | /* shift ovec left most of the bits... */ | |
228 | memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0)); | |
229 | /* now the remaining bits */ | |
230 | if (num % 8 != 0) | |
231 | for (i = 0; i < 8; ++i) { | |
232 | ovec[i] <<= num % 8; | |
233 | ovec[i] |= ovec[i + 1] >> (8 - num % 8); | |
234 | } | |
235 | iv = &ovec[0]; | |
236 | c2l(iv, v0); | |
237 | c2l(iv, v1); | |
238 | } | |
239 | d0 ^= ti[0]; | |
240 | d1 ^= ti[1]; | |
241 | l2cn(d0, d1, out, n); | |
242 | out += n; | |
243 | } | |
244 | } | |
245 | iv = &(*ivec)[0]; | |
246 | l2c(v0, iv); | |
247 | l2c(v1, iv); | |
248 | v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0; | |
249 | } |