tools/crypto_bench.c

   1 /*
   2  * Copyright (c) 2013 Nicolas George
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public License
   8  * as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /* Optional external libraries; can be enabled using:
  22  * make VERSUS=crypto+gcrypt+tomcrypt tools/crypto_bench */
  23 #define USE_crypto           0x01    /* OpenSSL's libcrypto */
  24 #define USE_gcrypt           0x02    /* GnuTLS's libgcrypt */
  25 #define USE_tomcrypt         0x04    /* LibTomCrypt */
  26
  27 #include <stdlib.h>
  28 #include <math.h>
  29
  30 #include "libavutil/avutil.h"
  31 #include "libavutil/avstring.h"
  32 #include "libavutil/crc.h"
  33 #include "libavutil/intreadwrite.h"
  34 #include "libavutil/timer.h"
  35
  36 #ifndef AV_READ_TIME
  37 #define AV_READ_TIME(x) 0
  38 #endif
  39
  40 #if HAVE_UNISTD_H
  41 #include <unistd.h> /* for getopt */
  42 #endif
  43 #if !HAVE_GETOPT
  44 #include "compat/getopt.c"
  45 #endif
  46
  47 #define MAX_INPUT_SIZE 1048576
  48 #define MAX_OUTPUT_SIZE 128
  49
  50 static const char *enabled_libs;
  51 static const char *enabled_algos;
  52 static unsigned specified_runs;
  53
  54 static const uint8_t *hardcoded_key = "FFmpeg is the best program ever.";
  55
  56 static void fatal_error(const char *tag)
  57 {
  58     av_log(NULL, AV_LOG_ERROR, "Fatal error: %s\n", tag);
  59     exit(1);
  60 }
  61
  62 struct hash_impl {
  63     const char *lib;
  64     const char *name;
  65     void (*run)(uint8_t *output, const uint8_t *input, unsigned size);
  66     const char *output;
  67 };
  68
  69 /***************************************************************************
  70  * lavu: libavutil
  71  ***************************************************************************/
  72
  73 #include "libavutil/md5.h"
  74 #include "libavutil/sha.h"
  75 #include "libavutil/sha512.h"
  76 #include "libavutil/ripemd.h"
  77 #include "libavutil/aes.h"
  78 #include "libavutil/blowfish.h"
  79 #include "libavutil/camellia.h"
  80 #include "libavutil/cast5.h"
  81 #include "libavutil/des.h"
  82 #include "libavutil/twofish.h"
  83 #include "libavutil/rc4.h"
  84 #include "libavutil/xtea.h"
  85
  86 #define IMPL_USE_lavu IMPL_USE
  87
  88 static void run_lavu_md5(uint8_t *output,
  89                          const uint8_t *input, unsigned size)
  90 {
  91     av_md5_sum(output, input, size);
  92 }
  93
  94 #define DEFINE_LAVU_MD(suffix, type, namespace, hsize)                       \
  95 static void run_lavu_ ## suffix(uint8_t *output,                             \
  96                                 const uint8_t *input, unsigned size)         \
  97 {                                                                            \
  98     static struct type *h;                                                   \
  99     if (!h && !(h = av_ ## namespace ## _alloc()))                           \
 100         fatal_error("out of memory");                                        \
 101     av_ ## namespace ## _init(h, hsize);                                     \
 102     av_ ## namespace ## _update(h, input, size);                             \
 103     av_ ## namespace ## _final(h, output);                                   \
 104 }
 105
 106 DEFINE_LAVU_MD(sha1,      AVSHA,    sha, 160);
 107 DEFINE_LAVU_MD(sha256,    AVSHA,    sha, 256);
 108 DEFINE_LAVU_MD(sha512,    AVSHA512, sha512, 512);
 109 DEFINE_LAVU_MD(ripemd128, AVRIPEMD, ripemd, 128);
 110 DEFINE_LAVU_MD(ripemd160, AVRIPEMD, ripemd, 160);
 111
 112 static void run_lavu_aes128(uint8_t *output,
 113                             const uint8_t *input, unsigned size)
 114 {
 115     static struct AVAES *aes;
 116     if (!aes && !(aes = av_aes_alloc()))
 117         fatal_error("out of memory");
 118     av_aes_init(aes, hardcoded_key, 128, 0);
 119     av_aes_crypt(aes, output, input, size >> 4, NULL, 0);
 120 }
 121
 122 static void run_lavu_blowfish(uint8_t *output,
 123                               const uint8_t *input, unsigned size)
 124 {
 125     static struct AVBlowfish *blowfish;
 126     if (!blowfish && !(blowfish = av_blowfish_alloc()))
 127         fatal_error("out of memory");
 128     av_blowfish_init(blowfish, hardcoded_key, 16);
 129     av_blowfish_crypt(blowfish, output, input, size >> 3, NULL, 0);
 130 }
 131
 132 static void run_lavu_camellia(uint8_t *output,
 133                               const uint8_t *input, unsigned size)
 134 {
 135     static struct AVCAMELLIA *camellia;
 136     if (!camellia && !(camellia = av_camellia_alloc()))
 137         fatal_error("out of memory");
 138     av_camellia_init(camellia, hardcoded_key, 128);
 139     av_camellia_crypt(camellia, output, input, size >> 4, NULL, 0);
 140 }
 141
 142 static void run_lavu_cast128(uint8_t *output,
 143                              const uint8_t *input, unsigned size)
 144 {
 145     static struct AVCAST5 *cast;
 146     if (!cast && !(cast = av_cast5_alloc()))
 147         fatal_error("out of memory");
 148     av_cast5_init(cast, hardcoded_key, 128);
 149     av_cast5_crypt(cast, output, input, size >> 3, 0);
 150 }
 151
 152 static void run_lavu_des(uint8_t *output,
 153                               const uint8_t *input, unsigned size)
 154 {
 155     static struct AVDES *des;
 156     if (!des && !(des = av_des_alloc()))
 157         fatal_error("out of memory");
 158     av_des_init(des, hardcoded_key, 64, 0);
 159     av_des_crypt(des, output, input, size >> 3, NULL, 0);
 160 }
 161
 162 static void run_lavu_twofish(uint8_t *output,
 163                               const uint8_t *input, unsigned size)
 164 {
 165     static struct AVTWOFISH *twofish;
 166     if (!twofish && !(twofish = av_twofish_alloc()))
 167         fatal_error("out of memory");
 168     av_twofish_init(twofish, hardcoded_key, 128);
 169     av_twofish_crypt(twofish, output, input, size >> 4, NULL, 0);
 170 }
 171
 172 static void run_lavu_rc4(uint8_t *output,
 173                               const uint8_t *input, unsigned size)
 174 {
 175     static struct AVRC4 *rc4;
 176     if (!rc4 && !(rc4 = av_rc4_alloc()))
 177         fatal_error("out of memory");
 178     av_rc4_init(rc4, hardcoded_key, 128, 0);
 179     av_rc4_crypt(rc4, output, input, size, NULL, 0);
 180 }
 181
 182 static void run_lavu_xtea(uint8_t *output,
 183                               const uint8_t *input, unsigned size)
 184 {
 185     static struct AVXTEA *xtea;
 186     if (!xtea && !(xtea = av_xtea_alloc()))
 187         fatal_error("out of memory");
 188     av_xtea_init(xtea, hardcoded_key);
 189     av_xtea_crypt(xtea, output, input, size >> 3, NULL, 0);
 190 }
 191
 192 /***************************************************************************
 193  * crypto: OpenSSL's libcrypto
 194  ***************************************************************************/
 195
 196 #if (USE_EXT_LIBS) & USE_crypto
 197
 198 #define OPENSSL_DISABLE_OLD_DES_SUPPORT
 199 #include <openssl/md5.h>
 200 #include <openssl/sha.h>
 201 #include <openssl/ripemd.h>
 202 #include <openssl/aes.h>
 203 #include <openssl/blowfish.h>
 204 #include <openssl/camellia.h>
 205 #include <openssl/cast.h>
 206 #include <openssl/des.h>
 207 #include <openssl/rc4.h>
 208
 209 #define DEFINE_CRYPTO_WRAPPER(suffix, function)                              \
 210 static void run_crypto_ ## suffix(uint8_t *output,                           \
 211                                   const uint8_t *input, unsigned size)       \
 212 {                                                                            \
 213     function(input, size, output);                                           \
 214 }
 215
 216 DEFINE_CRYPTO_WRAPPER(md5,       MD5)
 217 DEFINE_CRYPTO_WRAPPER(sha1,      SHA1)
 218 DEFINE_CRYPTO_WRAPPER(sha256,    SHA256)
 219 DEFINE_CRYPTO_WRAPPER(sha512,    SHA512)
 220 DEFINE_CRYPTO_WRAPPER(ripemd160, RIPEMD160)
 221
 222 static void run_crypto_aes128(uint8_t *output,
 223                               const uint8_t *input, unsigned size)
 224 {
 225     AES_KEY aes;
 226     unsigned i;
 227
 228     AES_set_encrypt_key(hardcoded_key, 128, &aes);
 229     size -= 15;
 230     for (i = 0; i < size; i += 16)
 231         AES_encrypt(input + i, output + i, &aes);
 232 }
 233
 234 static void run_crypto_blowfish(uint8_t *output,
 235                                 const uint8_t *input, unsigned size)
 236 {
 237     BF_KEY blowfish;
 238     unsigned i;
 239
 240     BF_set_key(&blowfish, 16, hardcoded_key);
 241     for (i = 0; i < size; i += 8)
 242         BF_ecb_encrypt(input + i, output + i, &blowfish, 1);
 243 }
 244
 245 static void run_crypto_camellia(uint8_t *output,
 246                                 const uint8_t *input, unsigned size)
 247 {
 248     CAMELLIA_KEY camellia;
 249     unsigned i;
 250
 251     Camellia_set_key(hardcoded_key, 128, &camellia);
 252     size -= 15;
 253     for (i = 0; i < size; i += 16)
 254         Camellia_ecb_encrypt(input + i, output + i, &camellia, 1);
 255 }
 256
 257 static void run_crypto_cast128(uint8_t *output,
 258                                const uint8_t *input, unsigned size)
 259 {
 260     CAST_KEY cast;
 261     unsigned i;
 262
 263     CAST_set_key(&cast, 16, hardcoded_key);
 264     for (i = 0; i < size; i += 8)
 265         CAST_ecb_encrypt(input + i, output + i, &cast, 1);
 266 }
 267
 268 static void run_crypto_des(uint8_t *output,
 269                            const uint8_t *input, unsigned size)
 270 {
 271     DES_key_schedule des;
 272     unsigned i;
 273
 274     DES_set_key(hardcoded_key, &des);
 275     for (i = 0; i < size; i += 8)
 276         DES_ecb_encrypt(input + i, output + i, &des, 1);
 277 }
 278
 279 static void run_crypto_rc4(uint8_t *output,
 280                                 const uint8_t *input, unsigned size)
 281 {
 282     RC4_KEY rc4;
 283
 284     RC4_set_key(&rc4, 16, hardcoded_key);
 285     RC4(&rc4, size, input, output);
 286 }
 287
 288 #define IMPL_USE_crypto(...) IMPL_USE(__VA_ARGS__)
 289 #else
 290 #define IMPL_USE_crypto(...) /* ignore */
 291 #endif
 292
 293 /***************************************************************************
 294  * gcrypt: GnuTLS's libgcrypt
 295  ***************************************************************************/
 296
 297 #if (USE_EXT_LIBS) & USE_gcrypt
 298
 299 #include <gcrypt.h>
 300
 301 #define DEFINE_GCRYPT_WRAPPER(suffix, algo)                                  \
 302 static void run_gcrypt_ ## suffix(uint8_t *output,                           \
 303                                   const uint8_t *input, unsigned size)       \
 304 {                                                                            \
 305     gcry_md_hash_buffer(GCRY_MD_ ## algo, output, input, size);              \
 306 }
 307
 308 DEFINE_GCRYPT_WRAPPER(md5,       MD5)
 309 DEFINE_GCRYPT_WRAPPER(sha1,      SHA1)
 310 DEFINE_GCRYPT_WRAPPER(sha256,    SHA256)
 311 DEFINE_GCRYPT_WRAPPER(sha512,    SHA512)
 312 DEFINE_GCRYPT_WRAPPER(ripemd160, RMD160)
 313
 314 #define DEFINE_GCRYPT_CYPHER_WRAPPER(suffix, cypher, sz)                            \
 315 static void run_gcrypt_ ## suffix(uint8_t *output,                                  \
 316                               const uint8_t *input, unsigned size)                  \
 317 {                                                                                   \
 318     static gcry_cipher_hd_t suffix;                                                 \
 319     if (!suffix)                                                                    \
 320         gcry_cipher_open(&suffix, GCRY_CIPHER_ ## cypher, GCRY_CIPHER_MODE_ECB, 0); \
 321     gcry_cipher_setkey(suffix, hardcoded_key, sz);                                  \
 322     gcry_cipher_encrypt(suffix, output, size, input, size);                         \
 323 }
 324
 325 DEFINE_GCRYPT_CYPHER_WRAPPER(aes128,   AES128,      16)
 326 DEFINE_GCRYPT_CYPHER_WRAPPER(blowfish, BLOWFISH,    16)
 327 DEFINE_GCRYPT_CYPHER_WRAPPER(camellia, CAMELLIA128, 16)
 328 DEFINE_GCRYPT_CYPHER_WRAPPER(cast128,  CAST5,       16)
 329 DEFINE_GCRYPT_CYPHER_WRAPPER(des,      DES,         8)
 330 DEFINE_GCRYPT_CYPHER_WRAPPER(twofish,  TWOFISH128,  16)
 331
 332 #define IMPL_USE_gcrypt(...) IMPL_USE(__VA_ARGS__)
 333 #else
 334 #define IMPL_USE_gcrypt(...) /* ignore */
 335 #endif
 336
 337 /***************************************************************************
 338  * tomcrypt: LibTomCrypt
 339  ***************************************************************************/
 340
 341 #if (USE_EXT_LIBS) & USE_tomcrypt
 342
 343 #include <tomcrypt.h>
 344
 345 #define DEFINE_TOMCRYPT_WRAPPER(suffix, namespace, algo)                     \
 346 static void run_tomcrypt_ ## suffix(uint8_t *output,                         \
 347                                     const uint8_t *input, unsigned size)     \
 348 {                                                                            \
 349     hash_state md;                                                           \
 350     namespace ## _init(&md);                                                 \
 351     namespace ## _process(&md, input, size);                                 \
 352     namespace ## _done(&md, output);                                         \
 353 }
 354
 355 DEFINE_TOMCRYPT_WRAPPER(md5,       md5,    MD5)
 356 DEFINE_TOMCRYPT_WRAPPER(sha1,      sha1,   SHA1)
 357 DEFINE_TOMCRYPT_WRAPPER(sha256,    sha256, SHA256)
 358 DEFINE_TOMCRYPT_WRAPPER(sha512,    sha512, SHA512)
 359 DEFINE_TOMCRYPT_WRAPPER(ripemd128, rmd128, RIPEMD128)
 360 DEFINE_TOMCRYPT_WRAPPER(ripemd160, rmd160, RIPEMD160)
 361
 362 static void run_tomcrypt_aes128(uint8_t *output,
 363                                 const uint8_t *input, unsigned size)
 364 {
 365     symmetric_key aes;
 366     unsigned i;
 367
 368     aes_setup(hardcoded_key, 16, 0, &aes);
 369     size -= 15;
 370     for (i = 0; i < size; i += 16)
 371         aes_ecb_encrypt(input + i, output + i, &aes);
 372 }
 373
 374 static void run_tomcrypt_blowfish(uint8_t *output,
 375                                   const uint8_t *input, unsigned size)
 376 {
 377     symmetric_key blowfish;
 378     unsigned i;
 379
 380     blowfish_setup(hardcoded_key, 16, 0, &blowfish);
 381     for (i = 0; i < size; i += 8)
 382         blowfish_ecb_encrypt(input + i, output + i, &blowfish);
 383 }
 384
 385 static void run_tomcrypt_camellia(uint8_t *output,
 386                                   const uint8_t *input, unsigned size)
 387 {
 388     symmetric_key camellia;
 389     unsigned i;
 390
 391     camellia_setup(hardcoded_key, 16, 0, &camellia);
 392     size -= 15;
 393     for (i = 0; i < size; i += 16)
 394         camellia_ecb_encrypt(input + i, output + i, &camellia);
 395 }
 396
 397 static void run_tomcrypt_cast128(uint8_t *output,
 398                                 const uint8_t *input, unsigned size)
 399 {
 400     symmetric_key cast;
 401     unsigned i;
 402
 403     cast5_setup(hardcoded_key, 16, 0, &cast);
 404     for (i = 0; i < size; i += 8)
 405         cast5_ecb_encrypt(input + i, output + i, &cast);
 406 }
 407
 408 static void run_tomcrypt_des(uint8_t *output,
 409                              const uint8_t *input, unsigned size)
 410 {
 411     symmetric_key des;
 412     unsigned i;
 413
 414     des_setup(hardcoded_key, 8, 0, &des);
 415     for (i = 0; i < size; i += 8)
 416         des_ecb_encrypt(input + i, output + i, &des);
 417 }
 418
 419 static void run_tomcrypt_twofish(uint8_t *output,
 420                                 const uint8_t *input, unsigned size)
 421 {
 422     symmetric_key twofish;
 423     unsigned i;
 424
 425     twofish_setup(hardcoded_key, 16, 0, &twofish);
 426     size -= 15;
 427     for (i = 0; i < size; i += 16)
 428         twofish_ecb_encrypt(input + i, output + i, &twofish);
 429 }
 430
 431 static void run_tomcrypt_xtea(uint8_t *output,
 432                               const uint8_t *input, unsigned size)
 433 {
 434     symmetric_key xtea;
 435     unsigned i;
 436
 437     xtea_setup(hardcoded_key, 16, 0, &xtea);
 438     for (i = 0; i < size; i += 8)
 439         xtea_ecb_encrypt(input + i, output + i, &xtea);
 440 }
 441
 442
 443 #define IMPL_USE_tomcrypt(...) IMPL_USE(__VA_ARGS__)
 444 #else
 445 #define IMPL_USE_tomcrypt(...) /* ignore */
 446 #endif
 447
 448 /***************************************************************************
 449  * Driver code
 450  ***************************************************************************/
 451
 452 static unsigned crc32(const uint8_t *data, unsigned size)
 453 {
 454     return av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0, data, size);
 455 }
 456
 457 static void run_implementation(const uint8_t *input, uint8_t *output,
 458                                struct hash_impl *impl, unsigned size)
 459 {
 460     uint64_t t0, t1;
 461     unsigned nruns = specified_runs ? specified_runs : (1 << 30) / size;
 462     unsigned outlen = 0, outcrc = 0;
 463     unsigned i, j, val;
 464     double mtime, ttime = 0, ttime2 = 0, stime;
 465     uint8_t outref[MAX_OUTPUT_SIZE];
 466
 467     if (enabled_libs  && !av_stristr(enabled_libs,  impl->lib) ||
 468         enabled_algos && !av_stristr(enabled_algos, impl->name))
 469         return;
 470     if (!sscanf(impl->output, "crc:%x", &outcrc)) {
 471         outlen = strlen(impl->output) / 2;
 472         for (i = 0; i < outlen; i++) {
 473             sscanf(impl->output + i * 2, "%02x", &val);
 474             outref[i] = val;
 475         }
 476     }
 477     for (i = 0; i < 8; i++) /* heat caches */
 478         impl->run(output, input, size);
 479     for (i = 0; i < nruns; i++) {
 480         memset(output, 0, size); /* avoid leftovers from previous runs */
 481         t0 = AV_READ_TIME();
 482         impl->run(output, input, size);
 483         t1 = AV_READ_TIME();
 484         if (outlen ? memcmp(output, outref, outlen) :
 485                      crc32(output, size) != outcrc) {
 486             fprintf(stderr, "Expected: ");
 487             if (outlen)
 488                 for (j = 0; j < outlen; j++)
 489                     fprintf(stderr, "%02x", output[j]);
 490             else
 491                 fprintf(stderr, "%08x", crc32(output, size));
 492             fprintf(stderr, "\n");
 493             fatal_error("output mismatch");
 494         }
 495         mtime = (double)(t1 - t0) / size;
 496         ttime  += mtime;
 497         ttime2 += mtime * mtime;
 498     }
 499
 500     ttime  /= nruns;
 501     ttime2 /= nruns;
 502     stime = sqrt(ttime2 - ttime * ttime);
 503     printf("%-10s %-12s size: %7d  runs: %6d  time: %8.3f +- %.3f\n",
 504            impl->lib, impl->name, size, nruns, ttime, stime);
 505     fflush(stdout);
 506 }
 507
 508 #define IMPL_USE(lib, name, symbol, output) \
 509     { #lib, name, run_ ## lib ## _ ## symbol, output },
 510 #define IMPL(lib, ...) IMPL_USE_ ## lib(lib, __VA_ARGS__)
 511 #define IMPL_ALL(...) \
 512     IMPL(lavu,       __VA_ARGS__) \
 513     IMPL(crypto,     __VA_ARGS__) \
 514     IMPL(gcrypt,     __VA_ARGS__) \
 515     IMPL(tomcrypt,   __VA_ARGS__)
 516
 517 struct hash_impl implementations[] = {
 518     IMPL_ALL("MD5",        md5,       "aa26ff5b895356bcffd9292ba9f89e66")
 519     IMPL_ALL("SHA-1",      sha1,      "1fd8bd1fa02f5b0fe916b0d71750726b096c5744")
 520     IMPL_ALL("SHA-256",    sha256,    "14028ac673b3087e51a1d407fbf0df4deeec8f217119e13b07bf2138f93db8c5")
 521     IMPL_ALL("SHA-512",    sha512,    "3afdd44a80d99af15c87bd724cb717243193767835ce866dd5d58c02d674bb57"
 522                                       "7c25b9e118c200a189fcd5a01ef106a4e200061f3e97dbf50ba065745fd46bef")
 523     IMPL(lavu,     "RIPEMD-128", ripemd128, "9ab8bfba2ddccc5d99c9d4cdfb844a5f")
 524     IMPL(tomcrypt, "RIPEMD-128", ripemd128, "9ab8bfba2ddccc5d99c9d4cdfb844a5f")
 525     IMPL_ALL("RIPEMD-160", ripemd160, "62a5321e4fc8784903bb43ab7752c75f8b25af00")
 526     IMPL_ALL("AES-128",    aes128,    "crc:ff6bc888")
 527     IMPL_ALL("CAMELLIA",   camellia,  "crc:7abb59a7")
 528     IMPL_ALL("CAST-128",   cast128,   "crc:456aa584")
 529     IMPL_ALL("BLOWFISH",   blowfish,  "crc:33e8aa74")
 530     IMPL_ALL("DES",        des,       "crc:31291e0b")
 531     IMPL(lavu,     "TWOFISH", twofish, "crc:9edbd5c1")
 532     IMPL(gcrypt,   "TWOFISH", twofish, "crc:9edbd5c1")
 533     IMPL(tomcrypt, "TWOFISH", twofish, "crc:9edbd5c1")
 534     IMPL(lavu,     "RC4",     rc4,     "crc:538d37b2")
 535     IMPL(crypto,   "RC4",     rc4,     "crc:538d37b2")
 536     IMPL(lavu,     "XTEA",    xtea,    "crc:931fc270")
 537     IMPL(tomcrypt, "XTEA",    xtea,    "crc:931fc270")
 538 };
 539
 540 int main(int argc, char **argv)
 541 {
 542     uint8_t *input = av_malloc(MAX_INPUT_SIZE * 2);
 543     uint8_t *output = input + MAX_INPUT_SIZE;
 544     unsigned i, impl, size;
 545     int opt;
 546
 547     while ((opt = getopt(argc, argv, "hl:a:r:")) != -1) {
 548         switch (opt) {
 549         case 'l':
 550             enabled_libs = optarg;
 551             break;
 552         case 'a':
 553             enabled_algos = optarg;
 554             break;
 555         case 'r':
 556             specified_runs = strtol(optarg, NULL, 0);
 557             break;
 558         case 'h':
 559         default:
 560             fprintf(stderr, "Usage: %s [-l libs] [-a algos] [-r runs]\n",
 561                     argv[0]);
 562             if ((USE_EXT_LIBS)) {
 563                 char buf[1024];
 564                 snprintf(buf, sizeof(buf), "%s%s%s",
 565                          ((USE_EXT_LIBS) & USE_crypto)   ? "+crypto"   : "",
 566                          ((USE_EXT_LIBS) & USE_gcrypt)   ? "+gcrypt"   : "",
 567                          ((USE_EXT_LIBS) & USE_tomcrypt) ? "+tomcrypt" : "");
 568                 fprintf(stderr, "Built with the following external libraries:\n"
 569                         "make VERSUS=%s\n", buf + 1);
 570             } else {
 571                 fprintf(stderr, "Built without external libraries; use\n"
 572                         "make VERSUS=crypto+gcrypt+tomcrypt tools/crypto_bench\n"
 573                         "to enable them.\n");
 574             }
 575             exit(opt != 'h');
 576         }
 577     }
 578
 579     if (!input)
 580         fatal_error("out of memory");
 581     for (i = 0; i < MAX_INPUT_SIZE; i += 4)
 582         AV_WB32(input + i, i);
 583
 584     size = MAX_INPUT_SIZE;
 585     for (impl = 0; impl < FF_ARRAY_ELEMS(implementations); impl++)
 586         run_implementation(input, output, &implementations[impl], size);
 587
 588     av_free(input);
 589
 590     return 0;
 591 }