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(2,6,33))
  41 #include <generated/autoconf.h>
  42 #else
  43 #include <linux/autoconf.h>
  44 #endif
  45 #include <linux/module.h>
  46 #include <linux/list.h>
  47 #include <linux/wait.h>
  48 #include <linux/time.h>
  49 #include <linux/version.h>
  50 #include <linux/unistd.h>
  51 #include <linux/kernel.h>
  52 #include <linux/string.h>
  53 #include <linux/time.h>
  54 #include <cryptodev.h>
  55 #include "rndtest.h"
  56
  57 static struct rndtest_stats rndstats;
  58
  59 static  void rndtest_test(struct rndtest_state *);
  60
  61 /* The tests themselves */
  62 static  int rndtest_monobit(struct rndtest_state *);
  63 static  int rndtest_runs(struct rndtest_state *);
  64 static  int rndtest_longruns(struct rndtest_state *);
  65 static  int rndtest_chi_4(struct rndtest_state *);
  66
  67 static  int rndtest_runs_check(struct rndtest_state *, int, int *);
  68 static  void rndtest_runs_record(struct rndtest_state *, int, int *);
  69
  70 static const struct rndtest_testfunc {
  71         int (*test)(struct rndtest_state *);
  72 } rndtest_funcs[] = {
  73         { rndtest_monobit },
  74         { rndtest_runs },
  75         { rndtest_chi_4 },
  76         { rndtest_longruns },
  77 };
  78
  79 #define RNDTEST_NTESTS  (sizeof(rndtest_funcs)/sizeof(rndtest_funcs[0]))
  80
  81 static void
  82 rndtest_test(struct rndtest_state *rsp)
  83 {
  84         int i, rv = 0;
  85
  86         rndstats.rst_tests++;
  87         for (i = 0; i < RNDTEST_NTESTS; i++)
  88                 rv |= (*rndtest_funcs[i].test)(rsp);
  89         rsp->rs_discard = (rv != 0);
  90 }
  91
  92
  93 extern int crypto_debug;
  94 #define rndtest_verbose 2
  95 #define rndtest_report(rsp, failure, fmt, a...) \
  96         { if (failure || crypto_debug) { printk("rng_test: " fmt "\n", a); } else; }
  97
  98 #define RNDTEST_MONOBIT_MINONES 9725
  99 #define RNDTEST_MONOBIT_MAXONES 10275
 100
 101 static int
 102 rndtest_monobit(struct rndtest_state *rsp)
 103 {
 104         int i, ones = 0, j;
 105         u_int8_t r;
 106
 107         for (i = 0; i < RNDTEST_NBYTES; i++) {
 108                 r = rsp->rs_buf[i];
 109                 for (j = 0; j < 8; j++, r <<= 1)
 110                         if (r & 0x80)
 111                                 ones++;
 112         }
 113         if (ones > RNDTEST_MONOBIT_MINONES &&
 114             ones < RNDTEST_MONOBIT_MAXONES) {
 115                 if (rndtest_verbose > 1)
 116                         rndtest_report(rsp, 0, "monobit pass (%d < %d < %d)",
 117                             RNDTEST_MONOBIT_MINONES, ones,
 118                             RNDTEST_MONOBIT_MAXONES);
 119                 return (0);
 120         } else {
 121                 if (rndtest_verbose)
 122                         rndtest_report(rsp, 1,
 123                             "monobit failed (%d ones)", ones);
 124                 rndstats.rst_monobit++;
 125                 return (-1);
 126         }
 127 }
 128
 129 #define RNDTEST_RUNS_NINTERVAL  6
 130
 131 static const struct rndtest_runs_tabs {
 132         u_int16_t min, max;
 133 } rndtest_runs_tab[] = {
 134         { 2343, 2657 },
 135         { 1135, 1365 },
 136         { 542, 708 },
 137         { 251, 373 },
 138         { 111, 201 },
 139         { 111, 201 },
 140 };
 141
 142 static int
 143 rndtest_runs(struct rndtest_state *rsp)
 144 {
 145         int i, j, ones, zeros, rv = 0;
 146         int onei[RNDTEST_RUNS_NINTERVAL], zeroi[RNDTEST_RUNS_NINTERVAL];
 147         u_int8_t c;
 148
 149         bzero(onei, sizeof(onei));
 150         bzero(zeroi, sizeof(zeroi));
 151         ones = zeros = 0;
 152         for (i = 0; i < RNDTEST_NBYTES; i++) {
 153                 c = rsp->rs_buf[i];
 154                 for (j = 0; j < 8; j++, c <<= 1) {
 155                         if (c & 0x80) {
 156                                 ones++;
 157                                 rndtest_runs_record(rsp, zeros, zeroi);
 158                                 zeros = 0;
 159                         } else {
 160                                 zeros++;
 161                                 rndtest_runs_record(rsp, ones, onei);
 162                                 ones = 0;
 163                         }
 164                 }
 165         }
 166         rndtest_runs_record(rsp, ones, onei);
 167         rndtest_runs_record(rsp, zeros, zeroi);
 168
 169         rv |= rndtest_runs_check(rsp, 0, zeroi);
 170         rv |= rndtest_runs_check(rsp, 1, onei);
 171
 172         if (rv)
 173                 rndstats.rst_runs++;
 174
 175         return (rv);
 176 }
 177
 178 static void
 179 rndtest_runs_record(struct rndtest_state *rsp, int len, int *intrv)
 180 {
 181         if (len == 0)
 182                 return;
 183         if (len > RNDTEST_RUNS_NINTERVAL)
 184                 len = RNDTEST_RUNS_NINTERVAL;
 185         len -= 1;
 186         intrv[len]++;
 187 }
 188
 189 static int
 190 rndtest_runs_check(struct rndtest_state *rsp, int val, int *src)
 191 {
 192         int i, rv = 0;
 193
 194         for (i = 0; i < RNDTEST_RUNS_NINTERVAL; i++) {
 195                 if (src[i] < rndtest_runs_tab[i].min ||
 196                     src[i] > rndtest_runs_tab[i].max) {
 197                         rndtest_report(rsp, 1,
 198                             "%s interval %d failed (%d, %d-%d)",
 199                             val ? "ones" : "zeros",
 200                             i + 1, src[i], rndtest_runs_tab[i].min,
 201                             rndtest_runs_tab[i].max);
 202                         rv = -1;
 203                 } else {
 204                         rndtest_report(rsp, 0,
 205                             "runs pass %s interval %d (%d < %d < %d)",
 206                             val ? "ones" : "zeros",
 207                             i + 1, rndtest_runs_tab[i].min, src[i],
 208                             rndtest_runs_tab[i].max);
 209                 }
 210         }
 211         return (rv);
 212 }
 213
 214 static int
 215 rndtest_longruns(struct rndtest_state *rsp)
 216 {
 217         int i, j, ones = 0, zeros = 0, maxones = 0, maxzeros = 0;
 218         u_int8_t c;
 219
 220         for (i = 0; i < RNDTEST_NBYTES; i++) {
 221                 c = rsp->rs_buf[i];
 222                 for (j = 0; j < 8; j++, c <<= 1) {
 223                         if (c & 0x80) {
 224                                 zeros = 0;
 225                                 ones++;
 226                                 if (ones > maxones)
 227                                         maxones = ones;
 228                         } else {
 229                                 ones = 0;
 230                                 zeros++;
 231                                 if (zeros > maxzeros)
 232                                         maxzeros = zeros;
 233                         }
 234                 }
 235         }
 236
 237         if (maxones < 26 && maxzeros < 26) {
 238                 rndtest_report(rsp, 0, "longruns pass (%d ones, %d zeros)",
 239                         maxones, maxzeros);
 240                 return (0);
 241         } else {
 242                 rndtest_report(rsp, 1, "longruns fail (%d ones, %d zeros)",
 243                         maxones, maxzeros);
 244                 rndstats.rst_longruns++;
 245                 return (-1);
 246         }
 247 }
 248
 249 /*
 250  * chi^2 test over 4 bits: (this is called the poker test in FIPS 140-2,
 251  * but it is really the chi^2 test over 4 bits (the poker test as described
 252  * by Knuth vol 2 is something different, and I take him as authoritative
 253  * on nomenclature over NIST).
 254  */
 255 #define RNDTEST_CHI4_K  16
 256 #define RNDTEST_CHI4_K_MASK     (RNDTEST_CHI4_K - 1)
 257
 258 /*
 259  * The unnormalized values are used so that we don't have to worry about
 260  * fractional precision.  The "real" value is found by:
 261  *      (V - 1562500) * (16 / 5000) = Vn   (where V is the unnormalized value)
 262  */
 263 #define RNDTEST_CHI4_VMIN       1563181         /* 2.1792 */
 264 #define RNDTEST_CHI4_VMAX       1576929         /* 46.1728 */
 265
 266 static int
 267 rndtest_chi_4(struct rndtest_state *rsp)
 268 {
 269         unsigned int freq[RNDTEST_CHI4_K], i, sum;
 270
 271         for (i = 0; i < RNDTEST_CHI4_K; i++)
 272                 freq[i] = 0;
 273
 274         /* Get number of occurances of each 4 bit pattern */
 275         for (i = 0; i < RNDTEST_NBYTES; i++) {
 276                 freq[(rsp->rs_buf[i] >> 4) & RNDTEST_CHI4_K_MASK]++;
 277                 freq[(rsp->rs_buf[i] >> 0) & RNDTEST_CHI4_K_MASK]++;
 278         }
 279
 280         for (i = 0, sum = 0; i < RNDTEST_CHI4_K; i++)
 281                 sum += freq[i] * freq[i];
 282
 283         if (sum >= 1563181 && sum <= 1576929) {
 284                 rndtest_report(rsp, 0, "chi^2(4): pass (sum %u)", sum);
 285                 return (0);
 286         } else {
 287                 rndtest_report(rsp, 1, "chi^2(4): failed (sum %u)", sum);
 288                 rndstats.rst_chi++;
 289                 return (-1);
 290         }
 291 }
 292
 293 int
 294 rndtest_buf(unsigned char *buf)
 295 {
 296         struct rndtest_state rsp;
 297
 298         memset(&rsp, 0, sizeof(rsp));
 299         rsp.rs_buf = buf;
 300         rndtest_test(&rsp);
 301         return(rsp.rs_discard);
 302 }
 303