[package] udev: bump to 173
[openwrt.git] / target / linux / generic / files / crypto / ocf / rndtest.c
1 /* $OpenBSD$ */
2
3 /*
4 * OCF/Linux port done by David McCullough <david_mccullough@mcafee.com>
5 * Copyright (C) 2006-2010 David McCullough
6 * Copyright (C) 2004-2005 Intel Corporation.
7 * The license and original author are listed below.
8 *
9 * Copyright (c) 2002 Jason L. Wright (jason@thought.net)
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by Jason L. Wright
23 * 4. The name of the author may not be used to endorse or promote products
24 * derived from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
28 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
29 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
30 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
31 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
34 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
35 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 #include <linux/version.h>
40 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) && !defined(AUTOCONF_INCLUDED)
41 #include <linux/config.h>
42 #endif
43 #include <linux/module.h>
44 #include <linux/list.h>
45 #include <linux/wait.h>
46 #include <linux/time.h>
47 #include <linux/unistd.h>
48 #include <linux/kernel.h>
49 #include <linux/string.h>
50 #include <linux/time.h>
51 #include <cryptodev.h>
52 #include "rndtest.h"
53
54 static struct rndtest_stats rndstats;
55
56 static void rndtest_test(struct rndtest_state *);
57
58 /* The tests themselves */
59 static int rndtest_monobit(struct rndtest_state *);
60 static int rndtest_runs(struct rndtest_state *);
61 static int rndtest_longruns(struct rndtest_state *);
62 static int rndtest_chi_4(struct rndtest_state *);
63
64 static int rndtest_runs_check(struct rndtest_state *, int, int *);
65 static void rndtest_runs_record(struct rndtest_state *, int, int *);
66
67 static const struct rndtest_testfunc {
68 int (*test)(struct rndtest_state *);
69 } rndtest_funcs[] = {
70 { rndtest_monobit },
71 { rndtest_runs },
72 { rndtest_chi_4 },
73 { rndtest_longruns },
74 };
75
76 #define RNDTEST_NTESTS (sizeof(rndtest_funcs)/sizeof(rndtest_funcs[0]))
77
78 static void
79 rndtest_test(struct rndtest_state *rsp)
80 {
81 int i, rv = 0;
82
83 rndstats.rst_tests++;
84 for (i = 0; i < RNDTEST_NTESTS; i++)
85 rv |= (*rndtest_funcs[i].test)(rsp);
86 rsp->rs_discard = (rv != 0);
87 }
88
89
90 extern int crypto_debug;
91 #define rndtest_verbose 2
92 #define rndtest_report(rsp, failure, fmt, a...) \
93 { if (failure || crypto_debug) { printk("rng_test: " fmt "\n", a); } else; }
94
95 #define RNDTEST_MONOBIT_MINONES 9725
96 #define RNDTEST_MONOBIT_MAXONES 10275
97
98 static int
99 rndtest_monobit(struct rndtest_state *rsp)
100 {
101 int i, ones = 0, j;
102 u_int8_t r;
103
104 for (i = 0; i < RNDTEST_NBYTES; i++) {
105 r = rsp->rs_buf[i];
106 for (j = 0; j < 8; j++, r <<= 1)
107 if (r & 0x80)
108 ones++;
109 }
110 if (ones > RNDTEST_MONOBIT_MINONES &&
111 ones < RNDTEST_MONOBIT_MAXONES) {
112 if (rndtest_verbose > 1)
113 rndtest_report(rsp, 0, "monobit pass (%d < %d < %d)",
114 RNDTEST_MONOBIT_MINONES, ones,
115 RNDTEST_MONOBIT_MAXONES);
116 return (0);
117 } else {
118 if (rndtest_verbose)
119 rndtest_report(rsp, 1,
120 "monobit failed (%d ones)", ones);
121 rndstats.rst_monobit++;
122 return (-1);
123 }
124 }
125
126 #define RNDTEST_RUNS_NINTERVAL 6
127
128 static const struct rndtest_runs_tabs {
129 u_int16_t min, max;
130 } rndtest_runs_tab[] = {
131 { 2343, 2657 },
132 { 1135, 1365 },
133 { 542, 708 },
134 { 251, 373 },
135 { 111, 201 },
136 { 111, 201 },
137 };
138
139 static int
140 rndtest_runs(struct rndtest_state *rsp)
141 {
142 int i, j, ones, zeros, rv = 0;
143 int onei[RNDTEST_RUNS_NINTERVAL], zeroi[RNDTEST_RUNS_NINTERVAL];
144 u_int8_t c;
145
146 bzero(onei, sizeof(onei));
147 bzero(zeroi, sizeof(zeroi));
148 ones = zeros = 0;
149 for (i = 0; i < RNDTEST_NBYTES; i++) {
150 c = rsp->rs_buf[i];
151 for (j = 0; j < 8; j++, c <<= 1) {
152 if (c & 0x80) {
153 ones++;
154 rndtest_runs_record(rsp, zeros, zeroi);
155 zeros = 0;
156 } else {
157 zeros++;
158 rndtest_runs_record(rsp, ones, onei);
159 ones = 0;
160 }
161 }
162 }
163 rndtest_runs_record(rsp, ones, onei);
164 rndtest_runs_record(rsp, zeros, zeroi);
165
166 rv |= rndtest_runs_check(rsp, 0, zeroi);
167 rv |= rndtest_runs_check(rsp, 1, onei);
168
169 if (rv)
170 rndstats.rst_runs++;
171
172 return (rv);
173 }
174
175 static void
176 rndtest_runs_record(struct rndtest_state *rsp, int len, int *intrv)
177 {
178 if (len == 0)
179 return;
180 if (len > RNDTEST_RUNS_NINTERVAL)
181 len = RNDTEST_RUNS_NINTERVAL;
182 len -= 1;
183 intrv[len]++;
184 }
185
186 static int
187 rndtest_runs_check(struct rndtest_state *rsp, int val, int *src)
188 {
189 int i, rv = 0;
190
191 for (i = 0; i < RNDTEST_RUNS_NINTERVAL; i++) {
192 if (src[i] < rndtest_runs_tab[i].min ||
193 src[i] > rndtest_runs_tab[i].max) {
194 rndtest_report(rsp, 1,
195 "%s interval %d failed (%d, %d-%d)",
196 val ? "ones" : "zeros",
197 i + 1, src[i], rndtest_runs_tab[i].min,
198 rndtest_runs_tab[i].max);
199 rv = -1;
200 } else {
201 rndtest_report(rsp, 0,
202 "runs pass %s interval %d (%d < %d < %d)",
203 val ? "ones" : "zeros",
204 i + 1, rndtest_runs_tab[i].min, src[i],
205 rndtest_runs_tab[i].max);
206 }
207 }
208 return (rv);
209 }
210
211 static int
212 rndtest_longruns(struct rndtest_state *rsp)
213 {
214 int i, j, ones = 0, zeros = 0, maxones = 0, maxzeros = 0;
215 u_int8_t c;
216
217 for (i = 0; i < RNDTEST_NBYTES; i++) {
218 c = rsp->rs_buf[i];
219 for (j = 0; j < 8; j++, c <<= 1) {
220 if (c & 0x80) {
221 zeros = 0;
222 ones++;
223 if (ones > maxones)
224 maxones = ones;
225 } else {
226 ones = 0;
227 zeros++;
228 if (zeros > maxzeros)
229 maxzeros = zeros;
230 }
231 }
232 }
233
234 if (maxones < 26 && maxzeros < 26) {
235 rndtest_report(rsp, 0, "longruns pass (%d ones, %d zeros)",
236 maxones, maxzeros);
237 return (0);
238 } else {
239 rndtest_report(rsp, 1, "longruns fail (%d ones, %d zeros)",
240 maxones, maxzeros);
241 rndstats.rst_longruns++;
242 return (-1);
243 }
244 }
245
246 /*
247 * chi^2 test over 4 bits: (this is called the poker test in FIPS 140-2,
248 * but it is really the chi^2 test over 4 bits (the poker test as described
249 * by Knuth vol 2 is something different, and I take him as authoritative
250 * on nomenclature over NIST).
251 */
252 #define RNDTEST_CHI4_K 16
253 #define RNDTEST_CHI4_K_MASK (RNDTEST_CHI4_K - 1)
254
255 /*
256 * The unnormalized values are used so that we don't have to worry about
257 * fractional precision. The "real" value is found by:
258 * (V - 1562500) * (16 / 5000) = Vn (where V is the unnormalized value)
259 */
260 #define RNDTEST_CHI4_VMIN 1563181 /* 2.1792 */
261 #define RNDTEST_CHI4_VMAX 1576929 /* 46.1728 */
262
263 static int
264 rndtest_chi_4(struct rndtest_state *rsp)
265 {
266 unsigned int freq[RNDTEST_CHI4_K], i, sum;
267
268 for (i = 0; i < RNDTEST_CHI4_K; i++)
269 freq[i] = 0;
270
271 /* Get number of occurances of each 4 bit pattern */
272 for (i = 0; i < RNDTEST_NBYTES; i++) {
273 freq[(rsp->rs_buf[i] >> 4) & RNDTEST_CHI4_K_MASK]++;
274 freq[(rsp->rs_buf[i] >> 0) & RNDTEST_CHI4_K_MASK]++;
275 }
276
277 for (i = 0, sum = 0; i < RNDTEST_CHI4_K; i++)
278 sum += freq[i] * freq[i];
279
280 if (sum >= 1563181 && sum <= 1576929) {
281 rndtest_report(rsp, 0, "chi^2(4): pass (sum %u)", sum);
282 return (0);
283 } else {
284 rndtest_report(rsp, 1, "chi^2(4): failed (sum %u)", sum);
285 rndstats.rst_chi++;
286 return (-1);
287 }
288 }
289
290 int
291 rndtest_buf(unsigned char *buf)
292 {
293 struct rndtest_state rsp;
294
295 memset(&rsp, 0, sizeof(rsp));
296 rsp.rs_buf = buf;
297 rndtest_test(&rsp);
298 return(rsp.rs_discard);
299 }
300
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