apps/passwd.c

   1 /*
   2  * Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #if defined OPENSSL_NO_MD5 || defined CHARSET_EBCDIC
  11 # define NO_MD5CRYPT_1
  12 #endif
  13
  14 #if defined OPENSSL_NO_SHA || defined CHARSET_EBCDIC
  15 # define NO_SHACRYPT
  16 #endif
  17
  18 #if !defined(OPENSSL_NO_DES) || !defined(NO_MD5CRYPT_1) || !defined(NO_SHACRYPT)
  19
  20 # include <string.h>
  21
  22 # include "apps.h"
  23
  24 # include <openssl/bio.h>
  25 # include <openssl/err.h>
  26 # include <openssl/evp.h>
  27 # include <openssl/rand.h>
  28 # ifndef OPENSSL_NO_DES
  29 #  include <openssl/des.h>
  30 # endif
  31 # ifndef NO_MD5CRYPT_1
  32 #  include <openssl/md5.h>
  33 # endif
  34 # ifndef NO_SHACRYPT
  35 #  include <openssl/sha.h>
  36 # endif
  37
  38 static unsigned const char cov_2char[64] = {
  39     /* from crypto/des/fcrypt.c */
  40     0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
  41     0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
  42     0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
  43     0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
  44     0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
  45     0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
  46     0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
  47     0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
  48 };
  49
  50 typedef enum {
  51     passwd_unset = 0,
  52     passwd_crypt,
  53     passwd_md5,
  54     passwd_apr1,
  55     passwd_sha256,
  56     passwd_sha512,
  57     passwd_aixmd5
  58 } passwd_modes;
  59
  60 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
  61                      char *passwd, BIO *out, int quiet, int table,
  62                      int reverse, size_t pw_maxlen, passwd_modes mode);
  63
  64 typedef enum OPTION_choice {
  65     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  66     OPT_IN,
  67     OPT_NOVERIFY, OPT_QUIET, OPT_TABLE, OPT_REVERSE, OPT_APR1,
  68     OPT_1, OPT_5, OPT_6, OPT_CRYPT, OPT_AIXMD5, OPT_SALT, OPT_STDIN
  69 } OPTION_CHOICE;
  70
  71 const OPTIONS passwd_options[] = {
  72     {"help", OPT_HELP, '-', "Display this summary"},
  73     {"in", OPT_IN, '<', "Read passwords from file"},
  74     {"noverify", OPT_NOVERIFY, '-',
  75      "Never verify when reading password from terminal"},
  76     {"quiet", OPT_QUIET, '-', "No warnings"},
  77     {"table", OPT_TABLE, '-', "Format output as table"},
  78     {"reverse", OPT_REVERSE, '-', "Switch table columns"},
  79     {"salt", OPT_SALT, 's', "Use provided salt"},
  80     {"stdin", OPT_STDIN, '-', "Read passwords from stdin"},
  81 # ifndef NO_SHACRYPT
  82     {"6", OPT_6, '-', "SHA512-based password algorithm"},
  83     {"5", OPT_5, '-', "SHA256-based password algorithm"},
  84 # endif
  85 # ifndef NO_MD5CRYPT_1
  86     {"apr1", OPT_APR1, '-', "MD5-based password algorithm, Apache variant"},
  87     {"1", OPT_1, '-', "MD5-based password algorithm"},
  88     {"aixmd5", OPT_AIXMD5, '-', "AIX MD5-based password algorithm"},
  89 # endif
  90 # ifndef OPENSSL_NO_DES
  91     {"crypt", OPT_CRYPT, '-', "Standard Unix password algorithm (default)"},
  92 # endif
  93     {NULL}
  94 };
  95
  96 int passwd_main(int argc, char **argv)
  97 {
  98     BIO *in = NULL;
  99     char *infile = NULL, *salt = NULL, *passwd = NULL, **passwds = NULL;
 100     char *salt_malloc = NULL, *passwd_malloc = NULL, *prog;
 101     OPTION_CHOICE o;
 102     int in_stdin = 0, pw_source_defined = 0;
 103 # ifndef OPENSSL_NO_UI
 104     int in_noverify = 0;
 105 # endif
 106     int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
 107     int ret = 1;
 108     passwd_modes mode = passwd_unset;
 109     size_t passwd_malloc_size = 0;
 110     size_t pw_maxlen = 256; /* arbitrary limit, should be enough for most
 111                              * passwords */
 112
 113     prog = opt_init(argc, argv, passwd_options);
 114     while ((o = opt_next()) != OPT_EOF) {
 115         switch (o) {
 116         case OPT_EOF:
 117         case OPT_ERR:
 118  opthelp:
 119             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 120             goto end;
 121         case OPT_HELP:
 122             opt_help(passwd_options);
 123             ret = 0;
 124             goto end;
 125         case OPT_IN:
 126             if (pw_source_defined)
 127                 goto opthelp;
 128             infile = opt_arg();
 129             pw_source_defined = 1;
 130             break;
 131         case OPT_NOVERIFY:
 132 # ifndef OPENSSL_NO_UI
 133             in_noverify = 1;
 134 # endif
 135             break;
 136         case OPT_QUIET:
 137             quiet = 1;
 138             break;
 139         case OPT_TABLE:
 140             table = 1;
 141             break;
 142         case OPT_REVERSE:
 143             reverse = 1;
 144             break;
 145         case OPT_1:
 146             if (mode != passwd_unset)
 147                 goto opthelp;
 148             mode = passwd_md5;
 149             break;
 150         case OPT_5:
 151             if (mode != passwd_unset)
 152                 goto opthelp;
 153             mode = passwd_sha256;
 154             break;
 155         case OPT_6:
 156             if (mode != passwd_unset)
 157                 goto opthelp;
 158             mode = passwd_sha512;
 159             break;
 160         case OPT_APR1:
 161             if (mode != passwd_unset)
 162                 goto opthelp;
 163             mode = passwd_apr1;
 164             break;
 165         case OPT_AIXMD5:
 166             if (mode != passwd_unset)
 167                 goto opthelp;
 168             mode = passwd_aixmd5;
 169             break;
 170         case OPT_CRYPT:
 171             if (mode != passwd_unset)
 172                 goto opthelp;
 173             mode = passwd_crypt;
 174             break;
 175         case OPT_SALT:
 176             passed_salt = 1;
 177             salt = opt_arg();
 178             break;
 179         case OPT_STDIN:
 180             if (pw_source_defined)
 181                 goto opthelp;
 182             in_stdin = 1;
 183             pw_source_defined = 1;
 184             break;
 185         }
 186     }
 187     argc = opt_num_rest();
 188     argv = opt_rest();
 189
 190     if (*argv != NULL) {
 191         if (pw_source_defined)
 192             goto opthelp;
 193         pw_source_defined = 1;
 194         passwds = argv;
 195     }
 196
 197     if (mode == passwd_unset) {
 198         /* use default */
 199         mode = passwd_crypt;
 200     }
 201
 202 # ifdef OPENSSL_NO_DES
 203     if (mode == passwd_crypt)
 204         goto opthelp;
 205 # endif
 206 # ifdef NO_MD5CRYPT_1
 207     if (mode == passwd_md5 || mode == passwd_apr1 || mode == passwd_aixmd5)
 208         goto opthelp;
 209 # endif
 210 # ifdef NO_SHACRYPT
 211     if (mode == passwd_sha256 || mode == passwd_sha512)
 212         goto opthelp;
 213 # endif
 214
 215     if (infile != NULL && in_stdin) {
 216         BIO_printf(bio_err, "%s: Can't combine -in and -stdin\n", prog);
 217         goto end;
 218     }
 219
 220     if (infile != NULL || in_stdin) {
 221         /*
 222          * If in_stdin is true, we know that infile is NULL, and that
 223          * bio_open_default() will give us back an alias for stdin.
 224          */
 225         in = bio_open_default(infile, 'r', FORMAT_TEXT);
 226         if (in == NULL)
 227             goto end;
 228     }
 229
 230     if (mode == passwd_crypt)
 231         pw_maxlen = 8;
 232
 233     if (passwds == NULL) {
 234         /* no passwords on the command line */
 235
 236         passwd_malloc_size = pw_maxlen + 2;
 237         /* longer than necessary so that we can warn about truncation */
 238         passwd = passwd_malloc =
 239             app_malloc(passwd_malloc_size, "password buffer");
 240     }
 241
 242     if ((in == NULL) && (passwds == NULL)) {
 243         /*
 244          * we use the following method to make sure what
 245          * in the 'else' section is always compiled, to
 246          * avoid rot of not-frequently-used code.
 247          */
 248         if (1) {
 249 # ifndef OPENSSL_NO_UI
 250             /* build a null-terminated list */
 251             static char *passwds_static[2] = { NULL, NULL };
 252
 253             passwds = passwds_static;
 254             if (in == NULL) {
 255                 if (EVP_read_pw_string
 256                     (passwd_malloc, passwd_malloc_size, "Password: ",
 257                      !(passed_salt || in_noverify)) != 0)
 258                     goto end;
 259             }
 260             passwds[0] = passwd_malloc;
 261         } else {
 262 # endif
 263             BIO_printf(bio_err, "password required\n");
 264             goto end;
 265         }
 266     }
 267
 268     if (in == NULL) {
 269         assert(passwds != NULL);
 270         assert(*passwds != NULL);
 271
 272         do {                    /* loop over list of passwords */
 273             passwd = *passwds++;
 274             if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, bio_out,
 275                            quiet, table, reverse, pw_maxlen, mode))
 276                 goto end;
 277         } while (*passwds != NULL);
 278     } else {
 279         /* in != NULL */
 280         int done;
 281
 282         assert(passwd != NULL);
 283         do {
 284             int r = BIO_gets(in, passwd, pw_maxlen + 1);
 285             if (r > 0) {
 286                 char *c = (strchr(passwd, '\n'));
 287                 if (c != NULL) {
 288                     *c = 0;     /* truncate at newline */
 289                 } else {
 290                     /* ignore rest of line */
 291                     char trash[BUFSIZ];
 292                     do
 293                         r = BIO_gets(in, trash, sizeof trash);
 294                     while ((r > 0) && (!strchr(trash, '\n')));
 295                 }
 296
 297                 if (!do_passwd
 298                     (passed_salt, &salt, &salt_malloc, passwd, bio_out, quiet,
 299                      table, reverse, pw_maxlen, mode))
 300                     goto end;
 301             }
 302             done = (r <= 0);
 303         } while (!done);
 304     }
 305     ret = 0;
 306
 307  end:
 308     ERR_print_errors(bio_err);
 309     OPENSSL_free(salt_malloc);
 310     OPENSSL_free(passwd_malloc);
 311     BIO_free(in);
 312     return (ret);
 313 }
 314
 315 # ifndef NO_MD5CRYPT_1
 316 /*
 317  * MD5-based password algorithm (should probably be available as a library
 318  * function; then the static buffer would not be acceptable). For magic
 319  * string "1", this should be compatible to the MD5-based BSD password
 320  * algorithm. For 'magic' string "apr1", this is compatible to the MD5-based
 321  * Apache password algorithm. (Apparently, the Apache password algorithm is
 322  * identical except that the 'magic' string was changed -- the laziest
 323  * application of the NIH principle I've ever encountered.)
 324  */
 325 static char *md5crypt(const char *passwd, const char *magic, const char *salt)
 326 {
 327     /* "$apr1$..salt..$.......md5hash..........\0" */
 328     static char out_buf[6 + 9 + 24 + 2];
 329     unsigned char buf[MD5_DIGEST_LENGTH];
 330     char *salt_out;
 331     int n;
 332     unsigned int i;
 333     EVP_MD_CTX *md = NULL, *md2 = NULL;
 334     size_t passwd_len, salt_len, magic_len;
 335
 336     passwd_len = strlen(passwd);
 337
 338     out_buf[0] = 0;
 339     magic_len = strlen(magic);
 340
 341     if (magic_len > 0) {
 342         out_buf[0] = '$';
 343         out_buf[1] = 0;
 344
 345         if (magic_len > 4)    /* assert it's  "1" or "apr1" */
 346             return NULL;
 347
 348         OPENSSL_strlcat(out_buf, magic, sizeof out_buf);
 349         OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 350     }
 351
 352     OPENSSL_strlcat(out_buf, salt, sizeof out_buf);
 353
 354     if (strlen(out_buf) > 6 + 8) /* assert "$apr1$..salt.." */
 355         return NULL;
 356
 357     salt_out = out_buf;
 358     if (magic_len > 0)
 359         salt_out += 2 + magic_len;
 360     salt_len = strlen(salt_out);
 361
 362     if (salt_len > 8)
 363         return NULL;
 364
 365     md = EVP_MD_CTX_new();
 366     if (md == NULL
 367         || !EVP_DigestInit_ex(md, EVP_md5(), NULL)
 368         || !EVP_DigestUpdate(md, passwd, passwd_len))
 369         goto err;
 370
 371     if (magic_len > 0)
 372         if (!EVP_DigestUpdate(md, "$", 1)
 373             || !EVP_DigestUpdate(md, magic, magic_len)
 374             || !EVP_DigestUpdate(md, "$", 1))
 375           goto err;
 376
 377     if (!EVP_DigestUpdate(md, salt_out, salt_len))
 378         goto err;
 379
 380     md2 = EVP_MD_CTX_new();
 381     if (md2 == NULL
 382         || !EVP_DigestInit_ex(md2, EVP_md5(), NULL)
 383         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 384         || !EVP_DigestUpdate(md2, salt_out, salt_len)
 385         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 386         || !EVP_DigestFinal_ex(md2, buf, NULL))
 387         goto err;
 388
 389     for (i = passwd_len; i > sizeof buf; i -= sizeof buf) {
 390         if (!EVP_DigestUpdate(md, buf, sizeof buf))
 391             goto err;
 392     }
 393     if (!EVP_DigestUpdate(md, buf, i))
 394         goto err;
 395
 396     n = passwd_len;
 397     while (n) {
 398         if (!EVP_DigestUpdate(md, (n & 1) ? "\0" : passwd, 1))
 399             goto err;
 400         n >>= 1;
 401     }
 402     if (!EVP_DigestFinal_ex(md, buf, NULL))
 403         return NULL;
 404
 405     for (i = 0; i < 1000; i++) {
 406         if (!EVP_DigestInit_ex(md2, EVP_md5(), NULL))
 407             goto err;
 408         if (!EVP_DigestUpdate(md2,
 409                               (i & 1) ? (unsigned const char *)passwd : buf,
 410                               (i & 1) ? passwd_len : sizeof buf))
 411             goto err;
 412         if (i % 3) {
 413             if (!EVP_DigestUpdate(md2, salt_out, salt_len))
 414                 goto err;
 415         }
 416         if (i % 7) {
 417             if (!EVP_DigestUpdate(md2, passwd, passwd_len))
 418                 goto err;
 419         }
 420         if (!EVP_DigestUpdate(md2,
 421                               (i & 1) ? buf : (unsigned const char *)passwd,
 422                               (i & 1) ? sizeof buf : passwd_len))
 423                 goto err;
 424         if (!EVP_DigestFinal_ex(md2, buf, NULL))
 425                 goto err;
 426     }
 427     EVP_MD_CTX_free(md2);
 428     EVP_MD_CTX_free(md);
 429     md2 = NULL;
 430     md = NULL;
 431
 432     {
 433         /* transform buf into output string */
 434         unsigned char buf_perm[sizeof buf];
 435         int dest, source;
 436         char *output;
 437
 438         /* silly output permutation */
 439         for (dest = 0, source = 0; dest < 14;
 440              dest++, source = (source + 6) % 17)
 441             buf_perm[dest] = buf[source];
 442         buf_perm[14] = buf[5];
 443         buf_perm[15] = buf[11];
 444 #  ifndef PEDANTIC              /* Unfortunately, this generates a "no
 445                                  * effect" warning */
 446         assert(16 == sizeof buf_perm);
 447 #  endif
 448
 449         output = salt_out + salt_len;
 450         assert(output == out_buf + strlen(out_buf));
 451
 452         *output++ = '$';
 453
 454         for (i = 0; i < 15; i += 3) {
 455             *output++ = cov_2char[buf_perm[i + 2] & 0x3f];
 456             *output++ = cov_2char[((buf_perm[i + 1] & 0xf) << 2) |
 457                                   (buf_perm[i + 2] >> 6)];
 458             *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
 459                                   (buf_perm[i + 1] >> 4)];
 460             *output++ = cov_2char[buf_perm[i] >> 2];
 461         }
 462         assert(i == 15);
 463         *output++ = cov_2char[buf_perm[i] & 0x3f];
 464         *output++ = cov_2char[buf_perm[i] >> 6];
 465         *output = 0;
 466         assert(strlen(out_buf) < sizeof(out_buf));
 467     }
 468
 469     return out_buf;
 470
 471  err:
 472     EVP_MD_CTX_free(md2);
 473     EVP_MD_CTX_free(md);
 474     return NULL;
 475 }
 476 # endif
 477
 478 # ifndef NO_SHACRYPT
 479 /*
 480  * SHA based password algorithm, describe by Ulrich Drepper here:
 481  * https://www.akkadia.org/drepper/SHA-crypt.txt
 482  * (note that it's in the public domain)
 483  */
 484 static char *shacrypt(const char *passwd, const char *magic, const char *salt)
 485 {
 486     /* Prefix for optional rounds specification.  */
 487     static const char rounds_prefix[] = "rounds=";
 488     /* Maximum salt string length.  */
 489 #  define SALT_LEN_MAX 16
 490     /* Default number of rounds if not explicitly specified.  */
 491 #  define ROUNDS_DEFAULT 5000
 492     /* Minimum number of rounds.  */
 493 #  define ROUNDS_MIN 1000
 494     /* Maximum number of rounds.  */
 495 #  define ROUNDS_MAX 999999999
 496
 497     /* "$6$rounds=<N>$......salt......$...shahash(up to 86 chars)...\0" */
 498     static char out_buf[3 + 17 + 17 + 86 + 1];
 499     unsigned char buf[SHA512_DIGEST_LENGTH];
 500     unsigned char temp_buf[SHA512_DIGEST_LENGTH];
 501     size_t buf_size = 0;
 502     char salt_copy[17];          /* Max 16 chars plus '\0' */
 503     size_t n;
 504     EVP_MD_CTX *md = NULL, *md2 = NULL;
 505     const EVP_MD *sha = NULL;
 506     size_t passwd_len, salt_len, magic_len;
 507     unsigned int rounds = 5000;        /* Default */
 508     char rounds_custom = 0;
 509     char *p_bytes = NULL;
 510     char *s_bytes = NULL;
 511     char *cp = NULL;
 512
 513     passwd_len = strlen(passwd);
 514     magic_len = strlen(magic);
 515
 516     /* assert it's "5" or "6" */
 517     if (magic_len != 1)
 518         return NULL;
 519
 520     switch (magic[0]) {
 521     case '5':
 522         sha = EVP_sha256();
 523         buf_size = 32;
 524         break;
 525     case '6':
 526         sha = EVP_sha512();
 527         buf_size = 64;
 528         break;
 529     default:
 530         return NULL;
 531     }
 532
 533     if (strncmp(salt, rounds_prefix, sizeof(rounds_prefix) - 1) == 0) {
 534         const char *num = salt + sizeof(rounds_prefix) - 1;
 535         char *endp;
 536         unsigned long int srounds = strtoul (num, &endp, 10);
 537         if (*endp == '$') {
 538             salt = endp + 1;
 539             if (srounds > ROUNDS_MAX)
 540                 rounds = ROUNDS_MAX;
 541             else if (srounds < ROUNDS_MIN)
 542                 rounds = ROUNDS_MIN;
 543             else
 544                 rounds = (unsigned int)srounds;
 545             rounds_custom = 1;
 546         } else {
 547             return NULL;
 548         }
 549     }
 550
 551     /* The salt gets truncated to 16 chars */
 552     OPENSSL_strlcpy(salt_copy, salt, sizeof salt_copy);
 553     salt_len = strlen(salt_copy);
 554
 555     out_buf[0] = 0;
 556     OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 557     OPENSSL_strlcat(out_buf, magic, sizeof out_buf);
 558     OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 559     if (rounds_custom) {
 560         char tmp_buf[80]; /* "rounds=999999999" */
 561         sprintf(tmp_buf, "rounds=%u", rounds);
 562         OPENSSL_strlcat(out_buf, tmp_buf, sizeof out_buf);
 563         OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 564     }
 565     OPENSSL_strlcat(out_buf, salt_copy, sizeof out_buf);
 566
 567     /* assert "$5$rounds=999999999$......salt......" */
 568     if (strlen(out_buf) > 3 + 17 * rounds_custom + salt_len )
 569         return NULL;
 570
 571     md = EVP_MD_CTX_new();
 572     if (md == NULL
 573         || !EVP_DigestInit_ex(md, sha, NULL)
 574         || !EVP_DigestUpdate(md, passwd, passwd_len)
 575         || !EVP_DigestUpdate(md, salt_copy, salt_len))
 576         goto err;
 577
 578     md2 = EVP_MD_CTX_new();
 579     if (md2 == NULL
 580         || !EVP_DigestInit_ex(md2, sha, NULL)
 581         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 582         || !EVP_DigestUpdate(md2, salt_copy, salt_len)
 583         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 584         || !EVP_DigestFinal_ex(md2, buf, NULL))
 585         goto err;
 586
 587     for (n = passwd_len; n > buf_size; n -= buf_size) {
 588         if (!EVP_DigestUpdate(md, buf, buf_size))
 589             goto err;
 590     }
 591     if (!EVP_DigestUpdate(md, buf, n))
 592         goto err;
 593
 594     n = passwd_len;
 595     while (n) {
 596         if (!EVP_DigestUpdate(md,
 597                               (n & 1) ? buf : (unsigned const char *)passwd,
 598                               (n & 1) ? buf_size : passwd_len))
 599             goto err;
 600         n >>= 1;
 601     }
 602     if (!EVP_DigestFinal_ex(md, buf, NULL))
 603         return NULL;
 604
 605     /* P sequence */
 606     if (!EVP_DigestInit_ex(md2, sha, NULL))
 607         goto err;
 608
 609     for (n = passwd_len; n > 0; n--)
 610         if (!EVP_DigestUpdate(md2, passwd, passwd_len))
 611             goto err;
 612
 613     if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))
 614         return NULL;
 615
 616     if ((p_bytes = OPENSSL_zalloc(passwd_len)) == NULL)
 617         goto err;
 618     for (cp = p_bytes, n = passwd_len; n > buf_size; n -= buf_size, cp += buf_size)
 619         memcpy(cp, temp_buf, buf_size);
 620     memcpy(cp, temp_buf, n);
 621
 622     /* S sequence */
 623     if (!EVP_DigestInit_ex(md2, sha, NULL))
 624         goto err;
 625
 626     for (n = 16 + buf[0]; n > 0; n--)
 627         if (!EVP_DigestUpdate(md2, salt, salt_len))
 628             goto err;
 629
 630     if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))
 631         return NULL;
 632
 633     if ((s_bytes = OPENSSL_zalloc(salt_len)) == NULL)
 634         goto err;
 635     for (cp = s_bytes, n = salt_len; n > buf_size; n -= buf_size, cp += buf_size)
 636         memcpy(cp, temp_buf, buf_size);
 637     memcpy(cp, temp_buf, n);
 638
 639     for (n = 0; n < rounds; n++) {
 640         if (!EVP_DigestInit_ex(md2, sha, NULL))
 641             goto err;
 642         if (!EVP_DigestUpdate(md2,
 643                               (n & 1) ? (unsigned const char *)p_bytes : buf,
 644                               (n & 1) ? passwd_len : buf_size))
 645             goto err;
 646         if (n % 3) {
 647             if (!EVP_DigestUpdate(md2, s_bytes, salt_len))
 648                 goto err;
 649         }
 650         if (n % 7) {
 651             if (!EVP_DigestUpdate(md2, p_bytes, passwd_len))
 652                 goto err;
 653         }
 654         if (!EVP_DigestUpdate(md2,
 655                               (n & 1) ? buf : (unsigned const char *)p_bytes,
 656                               (n & 1) ? buf_size : passwd_len))
 657                 goto err;
 658         if (!EVP_DigestFinal_ex(md2, buf, NULL))
 659                 goto err;
 660     }
 661     EVP_MD_CTX_free(md2);
 662     EVP_MD_CTX_free(md);
 663     md2 = NULL;
 664     md = NULL;
 665     OPENSSL_free(p_bytes);
 666     OPENSSL_free(s_bytes);
 667     p_bytes = NULL;
 668     s_bytes = NULL;
 669
 670     cp = out_buf + strlen(out_buf);
 671     *cp++ = '$';
 672
 673 #  define b64_from_24bit(B2, B1, B0, N)                                   \
 674     do {                                                                \
 675         unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0);             \
 676         int i = (N);                                                    \
 677         while (i-- > 0)                                                 \
 678             {                                                           \
 679                 *cp++ = cov_2char[w & 0x3f];                            \
 680                 w >>= 6;                                                \
 681             }                                                           \
 682     } while (0)
 683
 684     switch (*magic) {
 685     case '5':
 686         b64_from_24bit (buf[0], buf[10], buf[20], 4);
 687         b64_from_24bit (buf[21], buf[1], buf[11], 4);
 688         b64_from_24bit (buf[12], buf[22], buf[2], 4);
 689         b64_from_24bit (buf[3], buf[13], buf[23], 4);
 690         b64_from_24bit (buf[24], buf[4], buf[14], 4);
 691         b64_from_24bit (buf[15], buf[25], buf[5], 4);
 692         b64_from_24bit (buf[6], buf[16], buf[26], 4);
 693         b64_from_24bit (buf[27], buf[7], buf[17], 4);
 694         b64_from_24bit (buf[18], buf[28], buf[8], 4);
 695         b64_from_24bit (buf[9], buf[19], buf[29], 4);
 696         b64_from_24bit (0, buf[31], buf[30], 3);
 697         break;
 698     case '6':
 699         b64_from_24bit (buf[0], buf[21], buf[42], 4);
 700         b64_from_24bit (buf[22], buf[43], buf[1], 4);
 701         b64_from_24bit (buf[44], buf[2], buf[23], 4);
 702         b64_from_24bit (buf[3], buf[24], buf[45], 4);
 703         b64_from_24bit (buf[25], buf[46], buf[4], 4);
 704         b64_from_24bit (buf[47], buf[5], buf[26], 4);
 705         b64_from_24bit (buf[6], buf[27], buf[48], 4);
 706         b64_from_24bit (buf[28], buf[49], buf[7], 4);
 707         b64_from_24bit (buf[50], buf[8], buf[29], 4);
 708         b64_from_24bit (buf[9], buf[30], buf[51], 4);
 709         b64_from_24bit (buf[31], buf[52], buf[10], 4);
 710         b64_from_24bit (buf[53], buf[11], buf[32], 4);
 711         b64_from_24bit (buf[12], buf[33], buf[54], 4);
 712         b64_from_24bit (buf[34], buf[55], buf[13], 4);
 713         b64_from_24bit (buf[56], buf[14], buf[35], 4);
 714         b64_from_24bit (buf[15], buf[36], buf[57], 4);
 715         b64_from_24bit (buf[37], buf[58], buf[16], 4);
 716         b64_from_24bit (buf[59], buf[17], buf[38], 4);
 717         b64_from_24bit (buf[18], buf[39], buf[60], 4);
 718         b64_from_24bit (buf[40], buf[61], buf[19], 4);
 719         b64_from_24bit (buf[62], buf[20], buf[41], 4);
 720         b64_from_24bit (0, 0, buf[63], 2);
 721         break;
 722     default:
 723         goto err;
 724     }
 725     *cp = '\0';
 726
 727     return out_buf;
 728
 729  err:
 730     EVP_MD_CTX_free(md2);
 731     EVP_MD_CTX_free(md);
 732     OPENSSL_free(p_bytes);
 733     OPENSSL_free(s_bytes);
 734     return NULL;
 735 }
 736 # endif
 737
 738 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
 739                      char *passwd, BIO *out, int quiet, int table,
 740                      int reverse, size_t pw_maxlen, passwd_modes mode)
 741 {
 742     char *hash = NULL;
 743
 744     assert(salt_p != NULL);
 745     assert(salt_malloc_p != NULL);
 746
 747     /* first make sure we have a salt */
 748     if (!passed_salt) {
 749 # ifndef OPENSSL_NO_DES
 750         if (mode == passwd_crypt) {
 751             if (*salt_malloc_p == NULL)
 752                 *salt_p = *salt_malloc_p = app_malloc(3, "salt buffer");
 753             if (RAND_bytes((unsigned char *)*salt_p, 2) <= 0)
 754                 goto end;
 755             (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
 756             (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
 757             (*salt_p)[2] = 0;
 758 #  ifdef CHARSET_EBCDIC
 759             ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert back
 760                                                 * to ASCII */
 761 #  endif
 762         }
 763 # endif                         /* !OPENSSL_NO_DES */
 764
 765 # ifndef NO_MD5CRYPT_1
 766         if (mode == passwd_md5 || mode == passwd_apr1 || mode == passwd_aixmd5) {
 767             int i;
 768
 769             if (*salt_malloc_p == NULL)
 770                 *salt_p = *salt_malloc_p = app_malloc(9, "salt buffer");
 771             if (RAND_bytes((unsigned char *)*salt_p, 8) <= 0)
 772                 goto end;
 773
 774             for (i = 0; i < 8; i++)
 775                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 776             (*salt_p)[8] = 0;
 777         }
 778 # endif                         /* !NO_MD5CRYPT_1 */
 779
 780 # ifndef NO_SHACRYPT
 781         if (mode == passwd_sha256 || mode == passwd_sha512) {
 782             int i;
 783
 784             if (*salt_malloc_p == NULL)
 785                 *salt_p = *salt_malloc_p = app_malloc(17, "salt buffer");
 786             if (RAND_bytes((unsigned char *)*salt_p, 16) <= 0)
 787                 goto end;
 788
 789             for (i = 0; i < 16; i++)
 790                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 791             (*salt_p)[16] = 0;
 792         }
 793 # endif                         /* !NO_SHACRYPT */
 794     }
 795
 796     assert(*salt_p != NULL);
 797
 798     /* truncate password if necessary */
 799     if ((strlen(passwd) > pw_maxlen)) {
 800         if (!quiet)
 801             /*
 802              * XXX: really we should know how to print a size_t, not cast it
 803              */
 804             BIO_printf(bio_err,
 805                        "Warning: truncating password to %u characters\n",
 806                        (unsigned)pw_maxlen);
 807         passwd[pw_maxlen] = 0;
 808     }
 809     assert(strlen(passwd) <= pw_maxlen);
 810
 811     /* now compute password hash */
 812 # ifndef OPENSSL_NO_DES
 813     if (mode == passwd_crypt)
 814         hash = DES_crypt(passwd, *salt_p);
 815 # endif
 816 # ifndef NO_MD5CRYPT_1
 817     if (mode == passwd_md5 || mode == passwd_apr1)
 818         hash = md5crypt(passwd, (mode == passwd_md5 ? "1" : "apr1"), *salt_p);
 819     if (mode == passwd_aixmd5)
 820         hash = md5crypt(passwd, "", *salt_p);
 821 # endif
 822 # ifndef NO_SHACRYPT
 823     if (mode == passwd_sha256 || mode == passwd_sha512)
 824         hash = shacrypt(passwd, (mode == passwd_sha256 ? "5" : "6"), *salt_p);
 825 # endif
 826     assert(hash != NULL);
 827
 828     if (table && !reverse)
 829         BIO_printf(out, "%s\t%s\n", passwd, hash);
 830     else if (table && reverse)
 831         BIO_printf(out, "%s\t%s\n", hash, passwd);
 832     else
 833         BIO_printf(out, "%s\n", hash);
 834     return 1;
 835
 836  end:
 837     return 0;
 838 }
 839 #else
 840
 841 int passwd_main(int argc, char **argv)
 842 {
 843     BIO_printf(bio_err, "Program not available.\n");
 844     return (1);
 845 }
 846 #endif