crypto-keygen-standalone.c

   1 #include <d0_blind_id/d0_blind_id.h>
   2
   3 #include <stdio.h>
   4 #include <unistd.h>
   5 #include <getopt.h>
   6 #include <string.h>
   7 #include <stdlib.h>
   8 #include <signal.h>
   9 #include <math.h>
  10 #include <sys/types.h>
  11 #include <sys/stat.h>
  12
  13 // BEGIN stuff shared with crypto.c
  14 #define FOURCC_D0PK (('d' << 0) | ('0' << 8) | ('p' << 16) | ('k' << 24))
  15 #define FOURCC_D0SK (('d' << 0) | ('0' << 8) | ('s' << 16) | ('k' << 24))
  16 #define FOURCC_D0PI (('d' << 0) | ('0' << 8) | ('p' << 16) | ('i' << 24))
  17 #define FOURCC_D0SI (('d' << 0) | ('0' << 8) | ('s' << 16) | ('i' << 24))
  18 #define FOURCC_D0IQ (('d' << 0) | ('0' << 8) | ('i' << 16) | ('q' << 24))
  19 #define FOURCC_D0IR (('d' << 0) | ('0' << 8) | ('i' << 16) | ('r' << 24))
  20 #define FOURCC_D0ER (('d' << 0) | ('0' << 8) | ('e' << 16) | ('r' << 24))
  21 #define FOURCC_D0IC (('d' << 0) | ('0' << 8) | ('i' << 16) | ('c' << 24))
  22
  23 static unsigned long Crypto_LittleLong(const char *data)
  24 {
  25         return
  26                 ((unsigned char) data[0]) |
  27                 (((unsigned char) data[1]) << 8) |
  28                 (((unsigned char) data[2]) << 16) |
  29                 (((unsigned char) data[3]) << 24);
  30 }
  31
  32 static void Crypto_UnLittleLong(char *data, unsigned long l)
  33 {
  34         data[0] = l & 0xFF;
  35         data[1] = (l >> 8) & 0xFF;
  36         data[2] = (l >> 16) & 0xFF;
  37         data[3] = (l >> 24) & 0xFF;
  38 }
  39
  40 static size_t Crypto_ParsePack(const char *buf, size_t len, unsigned long header, const char **lumps, size_t *lumpsize, size_t nlumps)
  41 {
  42         size_t i;
  43         size_t pos;
  44         pos = 0;
  45         if(header)
  46         {
  47                 if(len < 4)
  48                         return 0;
  49                 if(Crypto_LittleLong(buf) != header)
  50                         return 0;
  51                 pos += 4;
  52         }
  53         for(i = 0; i < nlumps; ++i)
  54         {
  55                 if(pos + 4 > len)
  56                         return 0;
  57                 lumpsize[i] = Crypto_LittleLong(&buf[pos]);
  58                 pos += 4;
  59                 if(pos + lumpsize[i] > len)
  60                         return 0;
  61                 lumps[i] = &buf[pos];
  62                 pos += lumpsize[i];
  63         }
  64         return pos;
  65 }
  66
  67 static size_t Crypto_UnParsePack(char *buf, size_t len, unsigned long header, const char *const *lumps, const size_t *lumpsize, size_t nlumps)
  68 {
  69         size_t i;
  70         size_t pos;
  71         pos = 0;
  72         if(header)
  73         {
  74                 if(len < 4)
  75                         return 0;
  76                 Crypto_UnLittleLong(buf, header);
  77                 pos += 4;
  78         }
  79         for(i = 0; i < nlumps; ++i)
  80         {
  81                 if(pos + 4 + lumpsize[i] > len)
  82                         return 0;
  83                 Crypto_UnLittleLong(&buf[pos], lumpsize[i]);
  84                 pos += 4;
  85                 memcpy(&buf[pos], lumps[i], lumpsize[i]);
  86                 pos += lumpsize[i];
  87         }
  88         return pos;
  89 }
  90
  91 void file2lumps(const char *fn, unsigned long header, const char **lumps, size_t *lumpsize, size_t nlumps)
  92 {
  93         FILE *f;
  94         char buf[65536];
  95         size_t n;
  96         f = fopen(fn, "rb");
  97         if(!f)
  98         {
  99                 fprintf(stderr, "could not open %s\n", fn);
 100                 exit(1);
 101         }
 102         n = fread(buf, 1, sizeof(buf), f);
 103         fclose(f);
 104         if(!Crypto_ParsePack(buf, n, header, lumps, lumpsize, nlumps))
 105         {
 106                 fprintf(stderr, "could not parse %s as %c%c%c%c (%d lumps expected)\n", fn, (int) header & 0xFF, (int) (header >> 8) & 0xFF, (int) (header >> 16) & 0xFF, (int) (header >> 24) & 0xFF, (int) nlumps);
 107                 exit(1);
 108         }
 109 }
 110
 111 mode_t umask_save;
 112 void lumps2file(const char *fn, unsigned long header, const char *const *lumps, size_t *lumpsize, size_t nlumps, D0_BOOL private)
 113 {
 114         FILE *f;
 115         char buf[65536];
 116         size_t n;
 117         if(private)
 118                 umask(umask_save | 0077);
 119         else
 120                 umask(umask_save);
 121         f = fopen(fn, "wb");
 122         if(!f)
 123         {
 124                 fprintf(stderr, "could not open %s\n", fn);
 125                 exit(1);
 126         }
 127         if(!(n = Crypto_UnParsePack(buf, sizeof(buf), header, lumps, lumpsize, nlumps)))
 128         {
 129                 fprintf(stderr, "could not unparse for %s\n", fn);
 130                 exit(1);
 131         }
 132         n = fwrite(buf, n, 1, f);
 133         if(fclose(f) || !n)
 134         {
 135                 fprintf(stderr, "could not write %s\n", fn);
 136                 exit(1);
 137         }
 138 }
 139
 140 void USAGE(const char *me)
 141 {
 142         printf("Usage:\n"
 143                         "%s [-F] [-b bits] [-n progress-denominator] [-x prefix] [-X infix] [-C] -o private.d0sk\n"
 144                         "%s -P private.d0sk -o public.d0pk\n"
 145                         "%s [-n progress-denominator] [-x prefix] [-X infix] [-C] -p public.d0pk -o idkey-unsigned.d0si\n"
 146                         "%s -p public.d0pk -I idkey-unsigned.d0si -o request.d0iq -O camouflage.d0ic\n"
 147                         "%s -P private.d0sk -j request.d0iq -o response.d0ir\n"
 148                         "%s -p public.d0pk -I idkey-unsigned.d0si -c camouflage.d0ic -J response.d0ir -o idkey.d0si\n"
 149                         "%s -P private.d0sk -I idkey-unsigned.d0si -o idkey.d0si\n"
 150                         "%s -I idkey.d0si -o id.d0pi\n"
 151                         "%s -p public.d0pk\n"
 152                         "%s -P private.d0sk\n"
 153                         "%s -p public.d0pk -i id.d0pi\n"
 154                         "%s -p public.d0pk -I idkey.d0si\n",
 155                         me, me, me, me, me, me, me, me, me, me, me, me
 156                    );
 157 }
 158
 159 unsigned int seconds;
 160 unsigned int generated;
 161 unsigned int ntasks = 1;
 162 double generated_offset;
 163 double guesscount;
 164 double guessfactor;
 165 void print_generated(int signo)
 166 {
 167         (void) signo;
 168         ++seconds;
 169         if(generated >= 1000000000)
 170         {
 171                 generated_offset += generated;
 172                 generated = 0;
 173         }
 174         fprintf(stderr, "Generated: %.0f (about %.0f, %.1f/s, about %.2f hours for %.0f)\n",
 175                 // nasty and dishonest hack:
 176                 // we are adjusting the values "back", so the total count is
 177                 // divided by guessfactor (as the check function is called
 178                 // guessfactor as often as it would be if no fastreject were
 179                 // done)
 180                 // so the values indicate the relative speed of fastreject vs
 181                 // normal!
 182                 (generated + generated_offset) / guessfactor,
 183                 (generated + generated_offset) * ntasks / guessfactor,
 184                 (generated + generated_offset) * ntasks / (guessfactor * seconds),
 185                 guesscount * ((guessfactor * seconds) / (generated + generated_offset) / ntasks) / 3600.0,
 186                 guesscount);
 187         alarm(1);
 188 }
 189
 190 #define CHECK(x) if(!(x)) { fprintf(stderr, "error exit: error returned by %s\n", #x); exit(2); }
 191
 192 const char *prefix = NULL, *infix = NULL;
 193 size_t prefixlen = 0;
 194 int ignorecase;
 195 typedef D0_BOOL (*fingerprint_func) (const d0_blind_id_t *ctx, char *outbuf, size_t *outbuflen);
 196 D0_BOOL fastreject(const d0_blind_id_t *ctx, void *pass)
 197 {
 198         static char fp64[513]; size_t fp64size = 512;
 199         CHECK(((fingerprint_func) pass)(ctx, fp64, &fp64size));
 200         ++generated;
 201         if(ignorecase)
 202         {
 203                 if(prefixlen)
 204                         if(strncasecmp(fp64, prefix, prefixlen))
 205                                 return 1;
 206                 if(infix)
 207                 {
 208                         fp64[fp64size] = 0;
 209                         if(!strcasestr(fp64, infix))
 210                                 return 1;
 211                 }
 212         }
 213         else
 214         {
 215                 if(prefixlen)
 216                         if(memcmp(fp64, prefix, prefixlen))
 217                                 return 1;
 218                 if(infix)
 219                 {
 220                         fp64[fp64size] = 0;
 221                         if(!strstr(fp64, infix))
 222                                 return 1;
 223                 }
 224         }
 225         return 0;
 226 }
 227
 228 int main(int argc, char **argv)
 229 {
 230         int opt;
 231         size_t lumpsize[2];
 232         const char *lumps[2];
 233         char lumps_w0[65536];
 234         char lumps_w1[65536];
 235         const char *pubkeyfile = NULL, *privkeyfile = NULL, *pubidfile = NULL, *prividfile = NULL, *idreqfile = NULL, *idresfile = NULL, *outfile = NULL, *outfile2 = NULL, *camouflagefile = NULL;
 236         char fp64[513]; size_t fp64size = 512;
 237         int mask = 0;
 238         int bits = 1024;
 239         int i;
 240         D0_BOOL do_fastreject = 1;
 241         d0_blind_id_t *ctx;
 242         if(!d0_blind_id_INITIALIZE())
 243         {
 244                 fprintf(stderr, "could not initialize\n");
 245                 exit(1);
 246         }
 247
 248         umask_save = umask(0022);
 249
 250         ctx = d0_blind_id_new();
 251         while((opt = getopt(argc, argv, "p:P:i:I:j:J:o:O:c:b:x:X:y:Fn:C")) != -1)
 252         {
 253                 switch(opt)
 254                 {
 255                         case 'C':
 256                                 ignorecase = 1;
 257                                 break;
 258                         case 'n':
 259                                 ntasks = atoi(optarg);
 260                                 break;
 261                         case 'b':
 262                                 bits = atoi(optarg);
 263                                 break;
 264                         case 'p': // d0pk = <pubkey> <modulus>
 265                                 pubkeyfile = optarg;
 266                                 mask |= 1;
 267                                 break;
 268                         case 'P': // d0sk = <privkey> <modulus>
 269                                 privkeyfile = optarg;
 270                                 mask |= 2;
 271                                 break;
 272                         case 'i': // d0pi = <pubid>
 273                                 pubidfile = optarg;
 274                                 mask |= 4;
 275                                 break;
 276                         case 'I': // d0si = <privid>
 277                                 prividfile = optarg;
 278                                 mask |= 8;
 279                                 break;
 280                         case 'j': // d0iq = <req>
 281                                 idreqfile = optarg;
 282                                 mask |= 0x10;
 283                                 break;
 284                         case 'J': // d0ir = <resp>
 285                                 idresfile = optarg;
 286                                 mask |= 0x20;
 287                                 break;
 288                         case 'o':
 289                                 outfile = optarg;
 290                                 mask |= 0x40;
 291                                 break;
 292                         case 'O':
 293                                 outfile2 = optarg;
 294                                 mask |= 0x80;
 295                                 break;
 296                         case 'c':
 297                                 camouflagefile = optarg;
 298                                 mask |= 0x100;
 299                                 break;
 300                         case 'x':
 301                                 prefix = optarg;
 302                                 prefixlen = strlen(prefix);
 303                                 break;
 304                         case 'X':
 305                                 infix = optarg;
 306                                 break;
 307                         case 'F':
 308                                 do_fastreject = 0;
 309                                 break;
 310                         default:
 311                                 USAGE(*argv);
 312                                 return 1;
 313                 }
 314         }
 315
 316         // fastreject is a slight slowdown when rejecting nothing at all
 317         if(!infix && !prefixlen)
 318                 do_fastreject = 0;
 319
 320         guesscount = pow(64.0, prefixlen);
 321         if(infix)
 322                 guesscount /= (1 - pow(1 - pow(1/64.0, strlen(infix)), 44 - prefixlen - strlen(infix)));
 323         // 44 chars; prefix is assumed to not match the infix (although it theoretically could)
 324         // 43'th char however is always '=' and does not count
 325         if(ignorecase)
 326         {
 327                 if(infix)
 328                         for(i = 0; infix[i]; ++i)
 329                                 if(toupper(infix[i]) != tolower(infix[i]))
 330                                         guesscount /= 2;
 331                 for(i = 0; i < prefixlen; ++i)
 332                         if(toupper(prefix[i]) != tolower(prefix[i]))
 333                                 guesscount /= 2;
 334         }
 335
 336         if(do_fastreject)
 337         {
 338                 // fastreject: reject function gets called about log(2^bits) times more often
 339                 guessfactor = bits * log(2) / 2;
 340                 // so guess function gets called guesscount * guessfactor times, and it tests as many valid keys as guesscount
 341         }
 342
 343         if(mask & 1)
 344         {
 345                 file2lumps(pubkeyfile, FOURCC_D0PK, lumps, lumpsize, 2);
 346                 if(!d0_blind_id_read_public_key(ctx, lumps[0], lumpsize[0]))
 347                 {
 348                         fprintf(stderr, "could not decode public key\n");
 349                         exit(1);
 350                 }
 351                 if(!d0_blind_id_read_private_id_modulus(ctx, lumps[1], lumpsize[1]))
 352                 {
 353                         fprintf(stderr, "could not decode modulus\n");
 354                         exit(1);
 355                 }
 356         }
 357         else if(mask & 2)
 358         {
 359                 file2lumps(privkeyfile, FOURCC_D0SK, lumps, lumpsize, 2);
 360                 if(!d0_blind_id_read_private_key(ctx, lumps[0], lumpsize[0]))
 361                 {
 362                         fprintf(stderr, "could not decode private key\n");
 363                         exit(1);
 364                 }
 365                 if(!d0_blind_id_read_private_id_modulus(ctx, lumps[1], lumpsize[1]))
 366                 {
 367                         fprintf(stderr, "could not decode modulus\n");
 368                         exit(1);
 369                 }
 370         }
 371
 372         if(mask & 4)
 373         {
 374                 file2lumps(pubidfile, FOURCC_D0PI, lumps, lumpsize, 1);
 375                 if(!d0_blind_id_read_public_id(ctx, lumps[0], lumpsize[0]))
 376                 {
 377                         fprintf(stderr, "could not decode public ID\n");
 378                         exit(1);
 379                 }
 380         }
 381         if(mask & 8)
 382         {
 383                 file2lumps(prividfile, FOURCC_D0SI, lumps, lumpsize, 1);
 384                 if(!d0_blind_id_read_private_id(ctx, lumps[0], lumpsize[0]))
 385                 {
 386                         fprintf(stderr, "could not decode private ID\n");
 387                         exit(1);
 388                 }
 389         }
 390
 391         if(mask & 0x10)
 392         {
 393                 file2lumps(idreqfile, FOURCC_D0IQ, lumps, lumpsize, 1);
 394                 lumpsize[1] = sizeof(lumps_w1);
 395                 lumps[1] = lumps_w1;
 396                 if(!d0_blind_id_answer_private_id_request(ctx, lumps[0], lumpsize[0], lumps_w1, &lumpsize[1]))
 397                 {
 398                         fprintf(stderr, "could not answer private ID request\n");
 399                         exit(1);
 400                 }
 401         }
 402         else if((mask & 0x120) == 0x120)
 403         {
 404                 file2lumps(camouflagefile, FOURCC_D0IC, lumps, lumpsize, 1);
 405                 if(!d0_blind_id_read_private_id_request_camouflage(ctx, lumps[0], lumpsize[0]))
 406                 {
 407                         fprintf(stderr, "could not decode camouflage\n");
 408                         exit(1);
 409                 }
 410
 411                 file2lumps(idresfile, FOURCC_D0IR, lumps, lumpsize, 1);
 412                 if(!d0_blind_id_finish_private_id_request(ctx, lumps[0], lumpsize[0]))
 413                 {
 414                         fprintf(stderr, "could not finish private ID request\n");
 415                         exit(1);
 416                 }
 417         }
 418
 419         switch(mask)
 420         {
 421                 // modes of operation:
 422                 case 0x40:
 423                         //   nothing -> private key file (incl modulus), print fingerprint
 424                         generated = 0;
 425                         generated_offset = 0;
 426                         seconds = 0;
 427                         signal(SIGALRM, print_generated);
 428                         alarm(1);
 429                         if(do_fastreject)
 430                         {
 431                                 CHECK(d0_blind_id_generate_private_key_fastreject(ctx, bits, fastreject, d0_blind_id_fingerprint64_public_key));
 432                         }
 433                         else
 434                         {
 435                                 guessfactor = 1; // no fastreject here
 436                                 do
 437                                 {
 438                                         CHECK(d0_blind_id_generate_private_key(ctx, bits));
 439                                 }
 440                                 while(fastreject(ctx, d0_blind_id_fingerprint64_public_key));
 441                         }
 442                         alarm(0);
 443                         signal(SIGALRM, NULL);
 444                         CHECK(d0_blind_id_generate_private_id_modulus(ctx));
 445                         lumps[0] = lumps_w0;
 446                         lumpsize[0] = sizeof(lumps_w0);
 447                         lumps[1] = lumps_w1;
 448                         lumpsize[1] = sizeof(lumps_w1);
 449                         CHECK(d0_blind_id_write_private_key(ctx, lumps_w0, &lumpsize[0]));
 450                         CHECK(d0_blind_id_write_private_id_modulus(ctx, lumps_w1, &lumpsize[1]));
 451                         lumps2file(outfile, FOURCC_D0SK, lumps, lumpsize, 2, 1);
 452                         break;
 453                 case 0x42:
 454                         //   private key file -> public key file (incl modulus)
 455                         lumps[0] = lumps_w0;
 456                         lumpsize[0] = sizeof(lumps_w0);
 457                         lumps[1] = lumps_w1;
 458                         lumpsize[1] = sizeof(lumps_w1);
 459                         CHECK(d0_blind_id_write_public_key(ctx, lumps_w0, &lumpsize[0]));
 460                         CHECK(d0_blind_id_write_private_id_modulus(ctx, lumps_w1, &lumpsize[1]));
 461                         lumps2file(outfile, FOURCC_D0PK, lumps, lumpsize, 2, 0);
 462                         break;
 463                 case 0x41:
 464                         //   public key file -> unsigned private ID file
 465                         generated = 0;
 466                         generated_offset = 0;
 467                         seconds = 0;
 468                         signal(SIGALRM, print_generated);
 469                         alarm(1);
 470                         guessfactor = 1; // no fastreject here
 471                         do
 472                         {
 473                                 CHECK(d0_blind_id_generate_private_id_start(ctx));
 474                         }
 475                         while(fastreject(ctx, d0_blind_id_fingerprint64_public_id));
 476                         alarm(0);
 477                         signal(SIGALRM, 0);
 478                         lumps[0] = lumps_w0;
 479                         lumpsize[0] = sizeof(lumps_w0);
 480                         CHECK(d0_blind_id_write_private_id(ctx, lumps_w0, &lumpsize[0]));
 481                         lumps2file(outfile, FOURCC_D0SI, lumps, lumpsize, 1, 1);
 482                         break;
 483                 case 0xC9:
 484                         //   public key file, unsigned private ID file -> ID request file and camouflage file
 485                         lumps[0] = lumps_w0;
 486                         lumpsize[0] = sizeof(lumps_w0);
 487                         CHECK(d0_blind_id_generate_private_id_request(ctx, lumps_w0, &lumpsize[0]));
 488                         lumps2file(outfile, FOURCC_D0IQ, lumps, lumpsize, 1, 0);
 489                         lumpsize[0] = sizeof(lumps_w0);
 490                         CHECK(d0_blind_id_write_private_id_request_camouflage(ctx, lumps_w0, &lumpsize[0]));
 491                         lumps2file(outfile2, FOURCC_D0IC, lumps, lumpsize, 1, 1);
 492                         break;
 493                 case 0x52:
 494                         //   private key file, ID request file -> ID response file
 495                         lumps2file(outfile, FOURCC_D0IR, lumps+1, lumpsize+1, 1, 0);
 496                         break;
 497                 case 0x169:
 498                         //   public key file, ID response file, private ID file -> signed private ID file
 499                         lumps[0] = lumps_w0;
 500                         lumpsize[0] = sizeof(lumps_w0);
 501                         CHECK(d0_blind_id_write_private_id(ctx, lumps_w0, &lumpsize[0]));
 502                         lumps2file(outfile, FOURCC_D0SI, lumps, lumpsize, 1, 1);
 503                         break;
 504                 case 0x4A:
 505                         //   private key file, private ID file -> signed private ID file
 506                         {
 507                                 char buf[65536]; size_t bufsize;
 508                                 char buf2[65536]; size_t buf2size;
 509                                 D0_BOOL status;
 510                                 d0_blind_id_t *ctx2 = d0_blind_id_new();
 511                                 CHECK(d0_blind_id_copy(ctx2, ctx));
 512                                 bufsize = sizeof(buf);
 513                                 CHECK(d0_blind_id_authenticate_with_private_id_start(ctx, 1, 1, "hello world", 11, buf, &bufsize));
 514                                 buf2size = sizeof(buf2);
 515                                 CHECK(d0_blind_id_authenticate_with_private_id_challenge(ctx2, 1, 1, buf, bufsize, buf2, &buf2size, &status));
 516                                 bufsize = sizeof(buf);
 517                                 CHECK(d0_blind_id_authenticate_with_private_id_response(ctx, buf2, buf2size, buf, &bufsize));
 518                                 buf2size = sizeof(buf2);
 519                                 CHECK(d0_blind_id_authenticate_with_private_id_verify(ctx2, buf, bufsize, buf2, &buf2size, &status));
 520                                 CHECK(status == 0);
 521                                 CHECK(d0_blind_id_authenticate_with_private_id_generate_missing_signature(ctx2));
 522                                 lumps[0] = lumps_w0;
 523                                 lumpsize[0] = sizeof(lumps_w0);
 524                                 CHECK(d0_blind_id_write_private_id(ctx2, lumps_w0, &lumpsize[0]));
 525                                 lumps2file(outfile, FOURCC_D0SI, lumps, lumpsize, 1, 1);
 526                         }
 527                         break;
 528                 case 0x48:
 529                         //   private ID file -> public ID file
 530                         lumps[0] = lumps_w0;
 531                         lumpsize[0] = sizeof(lumps_w0);
 532                         CHECK(d0_blind_id_write_public_id(ctx, lumps_w0, &lumpsize[0]));
 533                         lumps2file(outfile, FOURCC_D0PI, lumps, lumpsize, 1, 0);
 534                         break;
 535                 case 0x01:
 536                 case 0x02:
 537                         //   public/private key file -> fingerprint
 538                         CHECK(d0_blind_id_fingerprint64_public_key(ctx, fp64, &fp64size));
 539                         printf("%.*s\n", (int)fp64size, fp64);
 540                         break;
 541                 case 0x05:
 542                 case 0x09:
 543                         //   public/private ID file -> fingerprint
 544                         CHECK(d0_blind_id_fingerprint64_public_id(ctx, fp64, &fp64size));
 545                         printf("%.*s\n", (int)fp64size, fp64);
 546                         break;
 547 /*
 548                 case 0x09:
 549                         //   public key, private ID file -> test whether key is properly signed
 550                         {
 551                                 char buf[65536]; size_t bufsize;
 552                                 char buf2[65536]; size_t buf2size;
 553                                 D0_BOOL status;
 554                                 d0_blind_id_t *ctx2 = d0_blind_id_new();
 555                                 CHECK(d0_blind_id_copy(ctx2, ctx));
 556                                 bufsize = sizeof(buf);
 557                                 CHECK(d0_blind_id_authenticate_with_private_id_start(ctx, 1, 1, "hello world", 11, buf, &bufsize));
 558                                 buf2size = sizeof(buf2);
 559                                 CHECK(d0_blind_id_authenticate_with_private_id_challenge(ctx2, 1, 1, buf, bufsize, buf2, &buf2size, &status));
 560                                 bufsize = sizeof(buf);
 561                                 CHECK(d0_blind_id_authenticate_with_private_id_response(ctx, buf2, buf2size, buf, &bufsize));
 562                                 buf2size = sizeof(buf2);
 563                                 CHECK(d0_blind_id_authenticate_with_private_id_verify(ctx2, buf, bufsize, buf2, &buf2size, &status));
 564                                 if(status)
 565                                         printf("OK\n");
 566                                 else
 567                                         printf("EPIC FAIL\n");
 568                         }
 569                         break;
 570 */
 571                 default:
 572                         USAGE(*argv);
 573                         exit(1);
 574                         break;
 575         }
 576         d0_blind_id_SHUTDOWN();
 577         return 0;
 578 }