mdw@git.distorted.org.uk Git - secnet/blob - crypto-test.c

   1 /*
   2  * crypto-test.c: common test vector processing
   3  */
   4 /*
   5  * This file is Free Software.  It was originally written for secnet.
   6  *
   7  * Copyright 2017 Mark Wooding
   8  *
   9  * You may redistribute secnet as a whole and/or modify it under the
  10  * terms of the GNU General Public License as published by the Free
  11  * Software Foundation; either version 3, or (at your option) any
  12  * later version.
  13  *
  14  * You may redistribute this file and/or modify it under the terms of
  15  * the GNU General Public License as published by the Free Software
  16  * Foundation; either version 2, or (at your option) any later
  17  * version.
  18  *
  19  * This software is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this software; if not, see
  26  * https://www.gnu.org/licenses/gpl.html.
  27  */
  28
  29 #include <assert.h>
  30 #include <errno.h>
  31 #include <ctype.h>
  32 #include <stdarg.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 #include "secnet.h"
  38 #include "util.h"
  39
  40 #include "crypto-test.h"
  41
  42 /*----- Utilities ---------------------------------------------------------*/
  43
  44 static void *xmalloc(size_t sz)
  45 {
  46     void *p;
  47
  48     if (!sz) return 0;
  49     p = malloc(sz);
  50     if (!p) {
  51         fprintf(stderr, "out of memory!\n");
  52         exit(2);
  53     }
  54     return p;
  55 }
  56
  57 static void *xrealloc(void *p, size_t sz)
  58 {
  59     void *q;
  60
  61     if (!sz) { free(p); return 0; }
  62     else if (!p) return xmalloc(sz);
  63     q = realloc(p, sz);
  64     if (!q) {
  65         fprintf(stderr, "out of memory!\n");
  66         exit(2);
  67     }
  68     return q;
  69 }
  70
  71 static int lno;
  72
  73 void bail(const char *msg, ...)
  74 {
  75     va_list ap;
  76     va_start(ap, msg);
  77     fprintf(stderr, "unexpected error (line %d): ", lno);
  78     vfprintf(stderr, msg, ap);
  79     va_end(ap);
  80     fputc('\n', stderr);
  81     exit(2);
  82 }
  83
  84 struct linebuf {
  85     char *p;
  86     size_t sz;
  87 };
  88 #define LINEBUF_INIT { 0, 0 };
  89
  90 static int read_line(struct linebuf *b, FILE *fp)
  91 {
  92     size_t n = 0;
  93     int ch;
  94
  95     ch = getc(fp); if (ch == EOF) return EOF;
  96     for (;;) {
  97         if (n >= b->sz) {
  98             b->sz = b->sz ? 2*b->sz : 64;
  99             b->p = xrealloc(b->p, b->sz);
 100         }
 101         if (ch == EOF || ch == '\n') { b->p[n++] = 0; return 0; }
 102         b->p[n++] = ch;
 103         ch = getc(fp);
 104     }
 105 }
 106
 107 void parse_hex(uint8_t *b, size_t sz, char *p)
 108 {
 109     size_t n = strlen(p);
 110     unsigned i;
 111     char bb[3];
 112
 113     if (n%2) bail("bad hex (odd number of nibbles)");
 114     else if (n/2 != sz) bail("bad hex (want %zu bytes, found %zu)", sz, n/2);
 115     while (sz) {
 116         for (i = 0; i < 2; i++) {
 117             if (!isxdigit((unsigned char)p[i]))
 118                 bail("bad hex digit `%c'", p[i]);
 119             bb[i] = p[i];
 120         }
 121         bb[2] = 0;
 122         p += 2;
 123         *b++ = strtoul(bb, 0, 16); sz--;
 124     }
 125 }
 126
 127 void dump_hex(FILE *fp, const uint8_t *b, size_t sz)
 128     { while (sz--) fprintf(fp, "%02x", *b++); fputc('\n', fp); }
 129
 130 void trivial_regty_init(union regval *v) { ; }
 131 void trivial_regty_release(union regval *v) { ; }
 132
 133 /* Define some global variables we shouldn't need.
 134  *
 135  * Annoyingly, `secnet.h' declares static pointers and initializes them to
 136  * point to some external variables.  At `-O0', GCC doesn't optimize these
 137  * away, so there's a link-time dependency on these variables.  Define them
 138  * here, so that `f25519.c' and `f448.c' can find them.
 139  *
 140  * (Later GCC has `-Og', which optimizes without making debugging a
 141  * nightmare, but I'm not running that version here.  Note that `serpent.c'
 142  * doesn't have this problem because it defines its own word load and store
 143  * operations to cope with its endian weirdness, whereas the field arithmetic
 144  * uses `unaligned.h' which manages to include `secnet.h'.)
 145  */
 146 uint64_t now_global;
 147 struct timeval tv_now_global;
 148
 149 /* Bletch.  sha512.c wants to drag in the world. */
 150 void *safe_malloc(size_t size, const char *message) { return xmalloc(size); }
 151 list_t *new_closure(closure_t *cl) { abort(); }
 152 void dict_add(dict_t *dict, cstring_t key, list_t *val) { abort(); }
 153
 154 /* Bletch.  util.c is a mess of layers. */
 155 int consttime_memeq(const void *s1in, const void *s2in, size_t n)
 156 {
 157     const uint8_t *s1=s1in, *s2=s2in;
 158     register volatile uint8_t accumulator=0;
 159
 160     while (n-- > 0) {
 161         accumulator |= (*s1++ ^ *s2++);
 162     }
 163     accumulator |= accumulator >> 4; /* constant-time             */
 164     accumulator |= accumulator >> 2; /*  boolean canonicalisation */
 165     accumulator |= accumulator >> 1;
 166     accumulator &= 1;
 167     accumulator ^= 1;
 168     return accumulator;
 169 }
 170
 171 /*----- Built-in types ----------------------------------------------------*/
 172
 173 /* Signed integer. */
 174
 175 static void parse_int(union regval *v, char *p)
 176 {
 177     char *q;
 178
 179     errno = 0;
 180     v->i = strtol(p, &q, 0);
 181     if (*q || errno) bail("bad integer `%s'", p);
 182 }
 183
 184 static void dump_int(FILE *fp, const union regval *v)
 185     { fprintf(fp, "%ld\n", v->i); }
 186
 187 static int eq_int(const union regval *v0, const union regval *v1)
 188     { return (v0->i == v1->i); }
 189
 190 const struct regty regty_int = {
 191     trivial_regty_init,
 192     parse_int,
 193     dump_int,
 194     eq_int,
 195     trivial_regty_release
 196 };
 197
 198 /* Unsigned integer. */
 199
 200 static void parse_uint(union regval *v, char *p)
 201 {
 202     char *q;
 203
 204     errno = 0;
 205     v->u = strtoul(p, &q, 0);
 206     if (*q || errno) bail("bad integer `%s'", p);
 207 }
 208
 209 static void dump_uint(FILE *fp, const union regval *v)
 210     { fprintf(fp, "%lu\n", v->u); }
 211
 212 static int eq_uint(const union regval *v0, const union regval *v1)
 213     { return (v0->u == v1->u); }
 214
 215 const struct regty regty_uint = {
 216     trivial_regty_init,
 217     parse_uint,
 218     dump_uint,
 219     eq_uint,
 220     trivial_regty_release
 221 };
 222
 223 /* Byte string, as hex. */
 224
 225 void allocate_bytes(union regval *v, size_t sz)
 226     { v->bytes.p = xmalloc(sz); v->bytes.sz = sz; }
 227
 228 static void init_bytes(union regval *v) { v->bytes.p = 0; v->bytes.sz = 0; }
 229
 230 static void parse_bytes(union regval *v, char *p)
 231 {
 232     size_t n = strlen(p);
 233
 234     allocate_bytes(v, n/2);
 235     parse_hex(v->bytes.p, v->bytes.sz, p);
 236 }
 237
 238 static void dump_bytes(FILE *fp, const union regval *v)
 239     { dump_hex(fp, v->bytes.p, v->bytes.sz); }
 240
 241 static int eq_bytes(const union regval *v0, const union regval *v1)
 242 {
 243     return v0->bytes.sz == v1->bytes.sz &&
 244         !memcmp(v0->bytes.p, v1->bytes.p, v0->bytes.sz);
 245 }
 246
 247 static void release_bytes(union regval *v) { free(v->bytes.p); }
 248
 249 const struct regty regty_bytes = {
 250     init_bytes,
 251     parse_bytes,
 252     dump_bytes,
 253     eq_bytes,
 254     release_bytes
 255 };
 256
 257 /*----- Core test machinery -----------------------------------------------*/
 258
 259 /* Say that a register is `reset' by releasing and then re-initializing it.
 260  * While there is a current test, all of that test's registers are
 261  * initialized.  The input registers are reset at the end of `check', ready
 262  * for the next test to load new values.  The output registers are reset at
 263  * the end of `check_test_output', so that a test runner can run a test
 264  * multiple times against the same test input, but with different context
 265  * data.
 266  */
 267
 268 #define REG(rvec, i)                                                    \
 269     ((struct reg *)((unsigned char *)state->rvec + (i)*state->regsz))
 270
 271 void check_test_output(struct test_state *state, const struct test *test)
 272 {
 273     const struct regdef *def;
 274     struct reg *reg, *in, *out;
 275     int ok = 1;
 276     int match;
 277
 278     for (def = test->regs; def->name; def++) {
 279         if (def->i >= state->nrout) continue;
 280         in = REG(in, def->i); out = REG(out, def->i);
 281         if (!def->ty->eq(&in->v, &out->v)) ok = 0;
 282     }
 283     if (ok)
 284         state->win++;
 285     else {
 286         printf("failed test `%s'\n", test->name);
 287         for (def = test->regs; def->name; def++) {
 288             in = REG(in, def->i);
 289             if (def->i >= state->nrout) {
 290                 printf("\t   input `%s' = ", def->name);
 291                 def->ty->dump(stdout, &in->v);
 292             } else {
 293                 out = REG(out, def->i);
 294                 match = def->ty->eq(&in->v, &out->v);
 295                 printf("\t%s `%s' = ",
 296                        match ? "  output" : "expected", def->name);
 297                 def->ty->dump(stdout, &in->v);
 298                 if (!match) {
 299                     printf("\tcomputed `%s' = ", def->name);
 300                     def->ty->dump(stdout, &out->v);
 301                 }
 302             }
 303         }
 304         state->lose++;
 305     }
 306
 307     for (def = test->regs; def->name; def++) {
 308         if (def->i >= state->nrout) continue;
 309         reg = REG(out, def->i);
 310         def->ty->release(&reg->v); def->ty->init(&reg->v);
 311     }
 312 }
 313
 314 void run_test(struct test_state *state, const struct test *test)
 315 {
 316     test->fn(state->out, state->in, 0);
 317     check_test_output(state, test);
 318 }
 319
 320 static void check(struct test_state *state, const struct test *test)
 321 {
 322     const struct regdef *def, *miss = 0;
 323     struct reg *reg;
 324     int any = 0;
 325
 326     if (!test) return;
 327     for (def = test->regs; def->name; def++) {
 328         reg = REG(in, def->i);
 329         if (reg->f&REGF_LIVE) any = 1;
 330         else if (!miss && !(def->f&REGF_OPT)) miss = def;
 331     }
 332     if (!any) return;
 333     if (miss)
 334         bail("register `%s' not set in test `%s'", def->name, test->name);
 335
 336     test->run(state, test);
 337
 338     for (def = test->regs; def->name; def++) {
 339         reg = REG(in, def->i);
 340         reg->f = 0; def->ty->release(&reg->v); def->ty->init(&reg->v);
 341     }
 342 }
 343
 344 int run_test_suite(unsigned nrout, unsigned nreg, size_t regsz,
 345                    const struct test *tests, FILE *fp)
 346 {
 347     struct linebuf buf = LINEBUF_INIT;
 348     struct test_state state[1];
 349     const struct test *test;
 350     const struct regdef *def;
 351     struct reg *reg;
 352     char *p;
 353     const char *q;
 354     int total;
 355     size_t n;
 356
 357     for (test = tests; test->name; test++)
 358         for (def = test->regs; def->name; def++)
 359             assert(def->i < nreg);
 360
 361     state->in = xmalloc(nreg*regsz);
 362     state->out = xmalloc(nrout*regsz);
 363     state->nrout = nrout;
 364     state->nreg = nreg;
 365     state->regsz = regsz;
 366     state->win = state->lose = 0;
 367
 368     test = 0;
 369     lno = 0;
 370     while (!read_line(&buf, fp)) {
 371         lno++;
 372         p = buf.p; n = strlen(buf.p);
 373
 374         while (isspace((unsigned char)*p)) p++;
 375         if (*p == '#') continue;
 376         if (!*p) { check(state, test); continue; }
 377
 378         q = p;
 379         while (*p && !isspace((unsigned char)*p)) p++;
 380         if (*p) *p++ = 0;
 381
 382         if (!strcmp(q, "test")) {
 383             if (!*p) bail("missing argument");
 384             check(state, test);
 385             if (test) {
 386                 for (def = test->regs; def->name; def++) {
 387                     def->ty->release(&REG(in, def->i)->v);
 388                     if (def->i < state->nrout)
 389                         def->ty->release(&REG(out, def->i)->v);
 390                 }
 391             }
 392             for (test = tests; test->name; test++)
 393                 if (!strcmp(p, test->name)) goto found_test;
 394             bail("unknown test `%s'", p);
 395         found_test:
 396             for (def = test->regs; def->name; def++) {
 397                 reg = REG(in, def->i);
 398                 reg->f = 0; def->ty->init(&reg->v);
 399                 if (def->i < state->nrout) {
 400                     reg = REG(out, def->i);
 401                     reg->f = 0; def->ty->init(&reg->v);
 402                 }
 403             }
 404             continue;
 405         }
 406
 407         if (!test) bail("no current test");
 408         for (def = test->regs; def->name; def++)
 409             if (!strcmp(q, def->name)) goto found_reg;
 410         bail("unknown register `%s' in test `%s'", q, test->name);
 411     found_reg:
 412         reg = REG(in, def->i);
 413         if (reg->f&REGF_LIVE) bail("register `%s' already set", def->name);
 414         def->ty->parse(&reg->v, p); reg->f |= REGF_LIVE;
 415     }
 416     check(state, test);
 417
 418     total = state->win + state->lose;
 419     if (!state->lose)
 420         printf("PASSED all %d test%s\n", state->win, total == 1 ? "" : "s");
 421     else
 422         printf("FAILED %d of %d test%s\n", state->lose, total,
 423                total == 1 ? "" : "s");
 424     return state->lose ? 1 : 0;
 425 }