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1 | /* -*-c-*- |
2 | * | |
6b2d9d76 | 3 | * $Id: storin.c,v 1.2 2000/07/02 15:21:20 mdw Exp $ |
e6e0e332 MW |
4 | * |
5 | * Block cipher optimized for DSPs | |
6 | * | |
7 | * (c) 2000 Mark Wooding | |
8 | */ | |
9 | ||
10 | /*----- Licensing notice --------------------------------------------------* | |
11 | * | |
12 | * Copyright (c) 2000 Mark Wooding | |
13 | * All rights reserved. | |
14 | * | |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions are | |
17 | * met: | |
18 | * | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * | |
22 | * 2, Redistributions in binary form must reproduce the above copyright | |
23 | * notice, this list of conditions and the following disclaimer in the | |
24 | * documentation and/or other materials provided with the distribution. | |
25 | * | |
26 | * 3. The name of the authors may not be used to endorse or promote | |
27 | * products derived from this software without specific prior written | |
28 | * permission. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
31 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
32 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
6b2d9d76 | 33 | * NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
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34 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
35 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
36 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
37 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
38 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | |
39 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
40 | * POSSIBILITY OF SUCH DAMAGE. | |
41 | * | |
42 | * Instead of accepting the above terms, you may redistribute and/or modify | |
43 | * this software under the terms of either the GNU General Public License, | |
44 | * or the GNU Library General Public License, published by the Free | |
45 | * Software Foundation; either version 2 of the License, or (at your | |
46 | * option) any later version. | |
47 | */ | |
48 | ||
49 | /*----- Revision history --------------------------------------------------* | |
50 | * | |
51 | * $Log: storin.c,v $ | |
6b2d9d76 MW |
52 | * Revision 1.2 2000/07/02 15:21:20 mdw |
53 | * Fix licence text. | |
54 | * | |
e6e0e332 MW |
55 | * Revision 1.1 2000/05/21 11:28:30 mdw |
56 | * Initial check-in. | |
57 | * | |
58 | */ | |
59 | ||
60 | /*----- Header files ------------------------------------------------------*/ | |
61 | ||
62 | #include "storin.h" | |
63 | #include "storin-tab.h" | |
64 | ||
65 | #include "matrix.h" | |
66 | ||
67 | /*----- Debugging output --------------------------------------------------*/ | |
68 | ||
69 | /* #define DEBUG */ | |
70 | /* #define TIMER */ | |
71 | ||
72 | #ifdef DEBUG | |
73 | # include <stdio.h> | |
74 | # define D(x) x | |
75 | #else | |
76 | # define D(x) | |
77 | #endif | |
78 | ||
79 | /*----- The constant matrix -----------------------------------------------*/ | |
80 | ||
81 | static const uint24 m[] = STORIN_M, mi[] = STORIN_MI; | |
82 | ||
83 | /*----- Main code ---------------------------------------------------------*/ | |
84 | ||
85 | /* --- @storin_init24@ --- * | |
86 | * | |
87 | * Arguments: @storin_ctx *k@ = pointer to cipher context to initialize | |
88 | * @const uint24 *buf@ = pointer to buffer of key material | |
89 | * @size_t sz@ = size of the key material | |
90 | * | |
91 | * Returns: --- | |
92 | * | |
93 | * Use: Initializes the storin for use. | |
94 | */ | |
95 | ||
96 | void storin_init24(storin_ctx *k, const uint24 *buf, size_t sz) | |
97 | { | |
98 | unsigned i, n; | |
99 | uint24 mm[16]; | |
100 | const uint24 *d; | |
101 | uint24 *dd; | |
102 | ||
103 | #define KEYS (4 * (STORIN_ROUNDS + 1)) | |
104 | ||
105 | D( puts("Key schedule...\n"); ) | |
106 | ||
107 | /* --- Seed the subkey array --- */ | |
108 | ||
109 | d = m; | |
110 | dd = k->k; | |
111 | n = KEYS; | |
112 | while (n > 15) { | |
113 | matmul(dd, d, m, 4, 4, 4); | |
114 | n -= 16; | |
115 | d = dd; | |
116 | dd += 16; | |
117 | } | |
118 | matmul(mm, d, m, 4, 4, 4); | |
119 | for (i = 0; i < n; i++) | |
120 | *dd++ = mm[i]; | |
121 | ||
122 | D( puts("Constant initial array contents:"); | |
123 | for (i = 0; i < KEYS; i++) { | |
124 | printf("%06x ", k->k[i]); | |
125 | if (i % 4 == 3) | |
126 | fputc('\n', stdout); | |
127 | } | |
128 | fputc('\n', stdout); ) | |
129 | ||
130 | /* --- Mix in the real key material --- */ | |
131 | ||
132 | dd = k->k; | |
133 | d = buf; | |
134 | n = sz; | |
135 | for (i = 0; i < KEYS; i++) { | |
136 | *dd++ ^= *d++; | |
137 | n--; | |
138 | if (n == 0) { | |
139 | n = sz; | |
140 | d = buf; | |
141 | } | |
142 | } | |
143 | ||
144 | D( puts("Array after mixing in key material:"); | |
145 | for (i = 0; i < KEYS; i++) { | |
146 | printf("%06x ", k->k[i]); | |
147 | if (i % 4 == 3) | |
148 | fputc('\n', stdout); | |
149 | } | |
150 | fputc('\n', stdout); ) | |
151 | ||
152 | /* --- Now mangle the key material horribly --- */ | |
153 | ||
154 | for (i = 0; i < 4; i++) | |
155 | mm[i] = 0; | |
156 | ||
157 | dd = k->k; | |
158 | for (i = 0; i < KEYS; i += 4) { | |
159 | storin_eblk24(k, mm, mm); | |
160 | for (n = 0; n < 4; n++) | |
161 | dd[n] = mm[n]; | |
162 | dd += 4; | |
163 | } | |
164 | ||
165 | D( puts("Final round subkeys:"); | |
166 | for (i = 0; i < KEYS; i++) { | |
167 | printf("%06x ", k->k[i]); | |
168 | if (i % 4 == 3) | |
169 | fputc('\n', stdout); | |
170 | } | |
171 | fputc('\n', stdout); ) | |
172 | } | |
173 | ||
174 | /* --- @storin_eblk24@, @storin_dblk24@ --- * | |
175 | * | |
176 | * Arguments: @const storin_ctx *k@ = pointer to cipher context | |
177 | * @const uint24 s[4]@ = pointer to source block | |
178 | * @uint24 d[4]@ = pointer to destination block | |
179 | * | |
180 | * Returns: --- | |
181 | * | |
182 | * Use: Low-level block encryption and decryption. | |
183 | */ | |
184 | ||
185 | void storin_eblk24(const storin_ctx *k, const uint24 *s, uint24 *d) | |
186 | { | |
187 | unsigned i, j; | |
188 | uint24 p[4], q[4]; | |
189 | const uint24 *kk = k->k; | |
190 | ||
191 | D( puts("Encryption..."); | |
192 | printf(" plaintext: %06x %06x %06x %06x\n", s[0], s[1], s[2], s[3]); ) | |
193 | ||
194 | for (j = 0; j < 4; j++) | |
195 | p[j] = s[j]; | |
196 | ||
197 | /* --- Main cipher guts --- */ | |
198 | ||
199 | for (i = 0; i < STORIN_ROUNDS; i++) { | |
200 | D( printf("round %2i\n", i); ) | |
201 | for (j = 0; j < 4; j++) | |
202 | q[j] = p[j] ^ *kk++; | |
203 | D( printf(" mix key: %06x %06x %06x %06x\n", q[0], q[1], q[2], q[3]); ) | |
204 | matmul(p, m, q, 4, 4, 1); | |
205 | D( printf(" matrix: %06x %06x %06x %06x\n", p[0], p[1], p[2], p[3]); ) | |
206 | for (j = 0; j < 4; j++) | |
207 | p[j] ^= p[j] >> 12; | |
208 | D( printf(" lin trans: %06x %06x %06x %06x\n", p[0], p[1], p[2], p[3]); ) | |
209 | } | |
210 | ||
211 | /* --- Postwhitening and output --- */ | |
212 | ||
213 | for (j = 0; j < 4; j++) | |
214 | d[j] = p[j] ^ *kk++; | |
215 | ||
216 | D( printf("ciphertext: %06x %06x %06x %06x\n", d[0], d[1], d[2], d[3]); ) | |
217 | } | |
218 | ||
219 | ||
220 | void storin_dblk24(const storin_ctx *k, const uint24 *s, uint24 *d) | |
221 | { | |
222 | unsigned i, j; | |
223 | uint24 p[4], q[4]; | |
224 | const uint24 *kk = k->k + KEYS; | |
225 | ||
226 | D( puts("Decryption..."); | |
227 | printf("ciphertext: %06x %06x %06x %06x\n", s[0], s[1], s[2], s[3]); ) | |
228 | ||
229 | for (j = 0; j < 4; j++) | |
230 | p[j] = s[j]; | |
231 | ||
232 | /* --- Main cipher guts --- */ | |
233 | ||
234 | for (i = 0; i < STORIN_ROUNDS; i++) { | |
235 | D( printf("round %2i\n", i); ) | |
236 | for (j = 0; j < 4; j++) | |
237 | q[3 - j] = p[3 - j] ^ *--kk; | |
238 | D( printf(" mix key: %06x %06x %06x %06x\n", q[0], q[1], q[2], q[3]); ) | |
239 | for (j = 0; j < 4; j++) | |
240 | q[j] ^= q[j] >> 12; | |
241 | D( printf(" lin trans: %06x %06x %06x %06x\n", p[0], p[1], p[2], p[3]); ) | |
242 | matmul(p, mi, q, 4, 4, 1); | |
243 | D( printf(" matrix: %06x %06x %06x %06x\n", p[0], p[1], p[2], p[3]); ) | |
244 | } | |
245 | ||
246 | /* --- Postwhitening and output --- */ | |
247 | ||
248 | for (j = 0; j < 4; j++) | |
249 | d[3 - j] = p[3 - j] ^ *--kk; | |
250 | ||
251 | D( printf(" plaintext: %06x %06x %06x %06x\n", d[0], d[1], d[2], d[3]); ) | |
252 | } | |
253 | ||
254 | /*----- Test rig ----------------------------------------------------------*/ | |
255 | ||
256 | #if defined(DEBUG) || defined(TIMER) | |
257 | ||
258 | #include <time.h> | |
259 | ||
260 | int main(void) | |
261 | { | |
262 | uint24 kk[] = { 1, 2, 3, 4, 5 }; | |
263 | uint24 p[4] = { 6, 7, 8, 9 }; | |
264 | uint24 q[4]; | |
265 | storin_ctx c; | |
266 | ||
267 | storin_init24(&c, kk, 5); | |
268 | ||
269 | #ifdef DEBUG | |
270 | storin_eblk24(&c, p, q); | |
271 | storin_dblk24(&c, q, q); | |
272 | #endif | |
273 | ||
274 | #ifdef TIMER | |
275 | { | |
276 | time_t now, then; | |
277 | unsigned n = 0; | |
278 | ||
279 | then = time(0); | |
280 | for (;;) { | |
281 | storin_eblk24(&c, p, q); | |
282 | n++; | |
283 | now = time(0); | |
284 | if (difftime(now, then) > 10.0) | |
285 | break; | |
286 | } | |
287 | printf("%g blocks/s = %g bits/s\n", n / 10.0, n * 96.0 / 10.0); | |
288 | } | |
289 | #endif | |
290 | return (0); | |
291 | } | |
292 | ||
293 | #endif | |
294 | ||
295 | /*----- That's all, folks -------------------------------------------------*/ |