text: /*
   * Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the Apache License 2.0 (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include <string.h>
  
  #include "apps.h"
  #include "progs.h"
  
  #include <openssl/bio.h>
  #include <openssl/err.h>
  #include <openssl/evp.h>
  #include <openssl/rand.h>
  #if !defined(OPENSSL_NO_DES) && !defined(OPENSSL_NO_DEPRECATED_3_0)
  # include <openssl/des.h>
  #endif
  #include <openssl/md5.h>
  #include <openssl/sha.h>
  
  static const unsigned char cov_2char[64] = {
      /* from crypto/des/fcrypt.c */
      0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
      0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
      0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
      0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
      0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
      0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
      0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
      0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
  };
  
  static const char ascii_dollar[] = { 0x24, 0x00 };
  
  typedef enum {
      passwd_unset = 0,
      passwd_md5,
      passwd_apr1,
      passwd_sha256,
      passwd_sha512,
      passwd_aixmd5
  } passwd_modes;
  
  static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
                       char *passwd, BIO *out, int quiet, int table,
                       int reverse, size_t pw_maxlen, passwd_modes mode);
  
  typedef enum OPTION_choice {
      OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
      OPT_IN,
      OPT_NOVERIFY, OPT_QUIET, OPT_TABLE, OPT_REVERSE, OPT_APR1,
      OPT_1, OPT_5, OPT_6, OPT_AIXMD5, OPT_SALT, OPT_STDIN,
      OPT_R_ENUM, OPT_PROV_ENUM
  } OPTION_CHOICE;
  
  const OPTIONS passwd_options[] = {
      {OPT_HELP_STR, 1, '-', "Usage: %s [options] [password]\n"},
  
      OPT_SECTION("General"),
      {"help", OPT_HELP, '-', "Display this summary"},
  
      OPT_SECTION("Input"),
      {"in", OPT_IN, '<', "Read passwords from file"},
      {"noverify", OPT_NOVERIFY, '-',
       "Never verify when reading password from terminal"},
      {"stdin", OPT_STDIN, '-', "Read passwords from stdin"},
  
      OPT_SECTION("Output"),
      {"quiet", OPT_QUIET, '-', "No warnings"},
      {"table", OPT_TABLE, '-', "Format output as table"},
      {"reverse", OPT_REVERSE, '-', "Switch table columns"},
  
      OPT_SECTION("Cryptographic"),
      {"salt", OPT_SALT, 's', "Use provided salt"},
      {"6", OPT_6, '-', "SHA512-based password algorithm"},
      {"5", OPT_5, '-', "SHA256-based password algorithm"},
      {"apr1", OPT_APR1, '-', "MD5-based password algorithm, Apache variant"},
      {"1", OPT_1, '-', "MD5-based password algorithm"},
      {"aixmd5", OPT_AIXMD5, '-', "AIX MD5-based password algorithm"},
  
      OPT_R_OPTIONS,
      OPT_PROV_OPTIONS,
  
      OPT_PARAMETERS(),
      {"password", 0, 0, "Password text to digest (optional)"},
      {NULL}
  };
  
  int passwd_main(int argc, char **argv)
  {
      BIO *in = NULL;
      char *infile = NULL, *salt = NULL, *passwd = NULL, **passwds = NULL;
      char *salt_malloc = NULL, *passwd_malloc = NULL, *prog;
      OPTION_CHOICE o;
      int in_stdin = 0, pw_source_defined = 0;
  #ifndef OPENSSL_NO_UI_CONSOLE
      int in_noverify = 0;
  #endif
      int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
      int ret = 1;
      passwd_modes mode = passwd_unset;
      size_t passwd_malloc_size = 0;
      size_t pw_maxlen = 256; /* arbitrary limit, should be enough for most
                               * passwords */
  
      prog = opt_init(argc, argv, passwd_options);
      while ((o = opt_next()) != OPT_EOF) {
          switch (o) {
          case OPT_EOF:
          case OPT_ERR:
   opthelp:
              BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
              goto end;
          case OPT_HELP:
              opt_help(passwd_options);
              ret = 0;
              goto end;
          case OPT_IN:
              if (pw_source_defined)
                  goto opthelp;
              infile = opt_arg();
              pw_source_defined = 1;
              break;
          case OPT_NOVERIFY:
  #ifndef OPENSSL_NO_UI_CONSOLE
              in_noverify = 1;
  #endif
              break;
          case OPT_QUIET:
              quiet = 1;
              break;
          case OPT_TABLE:
              table = 1;
              break;
          case OPT_REVERSE:
              reverse = 1;
              break;
          case OPT_1:
              if (mode != passwd_unset)
                  goto opthelp;
              mode = passwd_md5;
              break;
          case OPT_5:
              if (mode != passwd_unset)
                  goto opthelp;
              mode = passwd_sha256;
              break;
          case OPT_6:
              if (mode != passwd_unset)
                  goto opthelp;
              mode = passwd_sha512;
              break;
          case OPT_APR1:
              if (mode != passwd_unset)
                  goto opthelp;
              mode = passwd_apr1;
              break;
          case OPT_AIXMD5:
              if (mode != passwd_unset)
                  goto opthelp;
              mode = passwd_aixmd5;
              break;
          case OPT_SALT:
              passed_salt = 1;
              salt = opt_arg();
              break;
          case OPT_STDIN:
              if (pw_source_defined)
                  goto opthelp;
              in_stdin = 1;
              pw_source_defined = 1;
              break;
          case OPT_R_CASES:
              if (!opt_rand(o))
                  goto end;
              break;
          case OPT_PROV_CASES:
              if (!opt_provider(o))
                  goto end;
              break;
          }
      }
  
      /* All remaining arguments are the password text */
      argc = opt_num_rest();
      argv = opt_rest();
      if (*argv != NULL) {
          if (pw_source_defined)
              goto opthelp;
          pw_source_defined = 1;
          passwds = argv;
      }
  
      if (mode == passwd_unset) {
          /* use default */
          mode = passwd_md5;
      }
  
      if (infile != NULL && in_stdin) {
          BIO_printf(bio_err, "%s: Can't combine -in and -stdin\n", prog);
          goto end;
      }
  
      if (infile != NULL || in_stdin) {
          /*
           * If in_stdin is true, we know that infile is NULL, and that
           * bio_open_default() will give us back an alias for stdin.
           */
          in = bio_open_default(infile, 'r', FORMAT_TEXT);
          if (in == NULL)
              goto end;
      }
  
      if (passwds == NULL) {
          /* no passwords on the command line */
  
          passwd_malloc_size = pw_maxlen + 2;
          /* longer than necessary so that we can warn about truncation */
          passwd = passwd_malloc =
              app_malloc(passwd_malloc_size, "password buffer");
      }
  
      if ((in == NULL) && (passwds == NULL)) {
          /*
           * we use the following method to make sure what
           * in the 'else' section is always compiled, to
           * avoid rot of not-frequently-used code.
           */
          if (1) {
  #ifndef OPENSSL_NO_UI_CONSOLE
              /* build a null-terminated list */
              static char *passwds_static[2] = { NULL, NULL };
  
              passwds = passwds_static;
              if (in == NULL) {
                  if (EVP_read_pw_string
                      (passwd_malloc, passwd_malloc_size, "Password: ",
                       !(passed_salt || in_noverify)) != 0)
                      goto end;
              }
              passwds[0] = passwd_malloc;
          } else {
  #endif
              BIO_printf(bio_err, "password required\n");
              goto end;
          }
      }
  
      if (in == NULL) {
          assert(passwds != NULL);
          assert(*passwds != NULL);
  
          do {                    /* loop over list of passwords */
              passwd = *passwds++;
              if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, bio_out,
                             quiet, table, reverse, pw_maxlen, mode))
                  goto end;
          } while (*passwds != NULL);
      } else {
          /* in != NULL */
          int done;
  
          assert(passwd != NULL);
          do {
              int r = BIO_gets(in, passwd, pw_maxlen + 1);
              if (r > 0) {
                  char *c = (strchr(passwd, '\n'));
                  if (c != NULL) {
                      *c = 0;     /* truncate at newline */
                  } else {
                      /* ignore rest of line */
                      char trash[BUFSIZ];
                      do
                          r = BIO_gets(in, trash, sizeof(trash));
                      while ((r > 0) && (!strchr(trash, '\n')));
                  }
  
                  if (!do_passwd
                      (passed_salt, &salt, &salt_malloc, passwd, bio_out, quiet,
                       table, reverse, pw_maxlen, mode))
                      goto end;
              }
              done = (r <= 0);
          } while (!done);
      }
      ret = 0;
  
   end:
  #if 0
      ERR_print_errors(bio_err);
  #endif
      OPENSSL_free(salt_malloc);
      OPENSSL_free(passwd_malloc);
      BIO_free(in);
      return ret;
  }
  
  /*
   * MD5-based password algorithm (should probably be available as a library
   * function; then the static buffer would not be acceptable). For magic
   * string "1", this should be compatible to the MD5-based BSD password
   * algorithm. For 'magic' string "apr1", this is compatible to the MD5-based
   * Apache password algorithm. (Apparently, the Apache password algorithm is
   * identical except that the 'magic' string was changed -- the laziest
   * application of the NIH principle I've ever encountered.)
   */
  static char *md5crypt(const char *passwd, const char *magic, const char *salt)
  {
      /* "$apr1$..salt..$.......md5hash..........\0" */
      static char out_buf[6 + 9 + 24 + 2];
      unsigned char buf[MD5_DIGEST_LENGTH];
      char ascii_magic[5];         /* "apr1" plus '\0' */
      char ascii_salt[9];          /* Max 8 chars plus '\0' */
      char *ascii_passwd = NULL;
      char *salt_out;
      int n;
      unsigned int i;
      EVP_MD_CTX *md = NULL, *md2 = NULL;
      size_t passwd_len, salt_len, magic_len;
  
      passwd_len = strlen(passwd);
  
      out_buf[0] = 0;
      magic_len = strlen(magic);
      OPENSSL_strlcpy(ascii_magic, magic, sizeof(ascii_magic));
  #ifdef CHARSET_EBCDIC
      if ((magic[0] & 0x80) != 0)    /* High bit is 1 in EBCDIC alnums */
          ebcdic2ascii(ascii_magic, ascii_magic, magic_len);
  #endif
  
      /* The salt gets truncated to 8 chars */
      OPENSSL_strlcpy(ascii_salt, salt, sizeof(ascii_salt));
      salt_len = strlen(ascii_salt);
  #ifdef CHARSET_EBCDIC
      ebcdic2ascii(ascii_salt, ascii_salt, salt_len);
  #endif
  
  #ifdef CHARSET_EBCDIC
      ascii_passwd = OPENSSL_strdup(passwd);
      if (ascii_passwd == NULL)
          return NULL;
      ebcdic2ascii(ascii_passwd, ascii_passwd, passwd_len);
      passwd = ascii_passwd;
  #endif
  
      if (magic_len > 0) {
          OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
  
          if (magic_len > 4)    /* assert it's  "1" or "apr1" */
              goto err;
  
          OPENSSL_strlcat(out_buf, ascii_magic, sizeof(out_buf));
          OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
      }
  
      OPENSSL_strlcat(out_buf, ascii_salt, sizeof(out_buf));
  
      if (strlen(out_buf) > 6 + 8) /* assert "$apr1$..salt.." */
          goto err;
  
      salt_out = out_buf;
      if (magic_len > 0)
          salt_out += 2 + magic_len;
  
      if (salt_len > 8)
          goto err;
  
      md = EVP_MD_CTX_new();
      if (md == NULL
          || !EVP_DigestInit_ex(md, EVP_md5(), NULL)
          || !EVP_DigestUpdate(md, passwd, passwd_len))
          goto err;
  
      if (magic_len > 0)
          if (!EVP_DigestUpdate(md, ascii_dollar, 1)
              || !EVP_DigestUpdate(md, ascii_magic, magic_len)
              || !EVP_DigestUpdate(md, ascii_dollar, 1))
            goto err;
  
      if (!EVP_DigestUpdate(md, ascii_salt, salt_len))
          goto err;
  
      md2 = EVP_MD_CTX_new();
      if (md2 == NULL
          || !EVP_DigestInit_ex(md2, EVP_md5(), NULL)
          || !EVP_DigestUpdate(md2, passwd, passwd_len)
          || !EVP_DigestUpdate(md2, ascii_salt, salt_len)
          || !EVP_DigestUpdate(md2, passwd, passwd_len)
          || !EVP_DigestFinal_ex(md2, buf, NULL))
          goto err;
  
      for (i = passwd_len; i > sizeof(buf); i -= sizeof(buf)) {
          if (!EVP_DigestUpdate(md, buf, sizeof(buf)))
              goto err;
      }
      if (!EVP_DigestUpdate(md, buf, i))
          goto err;
  
      n = passwd_len;
      while (n) {
          if (!EVP_DigestUpdate(md, (n & 1) ? "\0" : passwd, 1))
              goto err;
          n >>= 1;
      }
      if (!EVP_DigestFinal_ex(md, buf, NULL))
          return NULL;
  
      for (i = 0; i < 1000; i++) {
          if (!EVP_DigestInit_ex(md2, EVP_md5(), NULL))
              goto err;
          if (!EVP_DigestUpdate(md2,
                                (i & 1) ? (const unsigned char *)passwd : buf,
                                (i & 1) ? passwd_len : sizeof(buf)))
              goto err;
          if (i % 3) {
              if (!EVP_DigestUpdate(md2, ascii_salt, salt_len))
                  goto err;
          }
          if (i % 7) {
              if (!EVP_DigestUpdate(md2, passwd, passwd_len))
                  goto err;
          }
          if (!EVP_DigestUpdate(md2,
                                (i & 1) ? buf : (const unsigned char *)passwd,
                                (i & 1) ? sizeof(buf) : passwd_len))
                  goto err;
          if (!EVP_DigestFinal_ex(md2, buf, NULL))
                  goto err;
      }
      EVP_MD_CTX_free(md2);
      EVP_MD_CTX_free(md);
      md2 = NULL;
      md = NULL;
  
      {
          /* transform buf into output string */
          unsigned char buf_perm[sizeof(buf)];
          int dest, source;
          char *output;
  
          /* silly output permutation */
          for (dest = 0, source = 0; dest < 14;
               dest++, source = (source + 6) % 17)
              buf_perm[dest] = buf[source];
          buf_perm[14] = buf[5];
          buf_perm[15] = buf[11];
  # ifndef PEDANTIC              /* Unfortunately, this generates a "no
                                   * effect" warning */
          assert(16 == sizeof(buf_perm));
  # endif
  
          output = salt_out + salt_len;
          assert(output == out_buf + strlen(out_buf));
  
          *output++ = ascii_dollar[0];
  
          for (i = 0; i < 15; i += 3) {
              *output++ = cov_2char[buf_perm[i + 2] & 0x3f];
              *output++ = cov_2char[((buf_perm[i + 1] & 0xf) << 2) |
                                    (buf_perm[i + 2] >> 6)];
              *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
                                    (buf_perm[i + 1] >> 4)];
              *output++ = cov_2char[buf_perm[i] >> 2];
          }
          assert(i == 15);
          *output++ = cov_2char[buf_perm[i] & 0x3f];
          *output++ = cov_2char[buf_perm[i] >> 6];
          *output = 0;
          assert(strlen(out_buf) < sizeof(out_buf));
  #ifdef CHARSET_EBCDIC
          ascii2ebcdic(out_buf, out_buf, strlen(out_buf));
  #endif
      }
  
      return out_buf;
  
   err:
      OPENSSL_free(ascii_passwd);
      EVP_MD_CTX_free(md2);
      EVP_MD_CTX_free(md);
      return NULL;
  }
  
  /*
   * SHA based password algorithm, describe by Ulrich Drepper here:
   * https://www.akkadia.org/drepper/SHA-crypt.txt
   * (note that it's in the public domain)
   */
  static char *shacrypt(const char *passwd, const char *magic, const char *salt)
  {
      /* Prefix for optional rounds specification.  */
      static const char rounds_prefix[] = "rounds=";
      /* Maximum salt string length.  */
  # define SALT_LEN_MAX 16
      /* Default number of rounds if not explicitly specified.  */
  # define ROUNDS_DEFAULT 5000
      /* Minimum number of rounds.  */
  # define ROUNDS_MIN 1000
      /* Maximum number of rounds.  */
  # define ROUNDS_MAX 999999999
  
      /* "$6$rounds=<N>$......salt......$...shahash(up to 86 chars)...\0" */
      static char out_buf[3 + 17 + 17 + 86 + 1];
      unsigned char buf[SHA512_DIGEST_LENGTH];
      unsigned char temp_buf[SHA512_DIGEST_LENGTH];
      size_t buf_size = 0;
      char ascii_magic[2];
      char ascii_salt[17];          /* Max 16 chars plus '\0' */
      char *ascii_passwd = NULL;
      size_t n;
      EVP_MD_CTX *md = NULL, *md2 = NULL;
      const EVP_MD *sha = NULL;
      size_t passwd_len, salt_len, magic_len;
      unsigned int rounds = 5000;        /* Default */
      char rounds_custom = 0;
      char *p_bytes = NULL;
      char *s_bytes = NULL;
      char *cp = NULL;
  
      passwd_len = strlen(passwd);
      magic_len = strlen(magic);
  
      /* assert it's "5" or "6" */
      if (magic_len != 1)
          return NULL;
  
      switch (magic[0]) {
      case '5':
          sha = EVP_sha256();
          buf_size = 32;
          break;
      case '6':
          sha = EVP_sha512();
          buf_size = 64;
          break;
      default:
          return NULL;
      }
  
      if (strncmp(salt, rounds_prefix, sizeof(rounds_prefix) - 1) == 0) {
          const char *num = salt + sizeof(rounds_prefix) - 1;
          char *endp;
          unsigned long int srounds = strtoul (num, &endp, 10);
          if (*endp == '$') {
              salt = endp + 1;
              if (srounds > ROUNDS_MAX)
                  rounds = ROUNDS_MAX;
              else if (srounds < ROUNDS_MIN)
                  rounds = ROUNDS_MIN;
              else
                  rounds = (unsigned int)srounds;
              rounds_custom = 1;
          } else {
              return NULL;
          }
      }
  
      OPENSSL_strlcpy(ascii_magic, magic, sizeof(ascii_magic));
  #ifdef CHARSET_EBCDIC
      if ((magic[0] & 0x80) != 0)    /* High bit is 1 in EBCDIC alnums */
          ebcdic2ascii(ascii_magic, ascii_magic, magic_len);
  #endif
  
      /* The salt gets truncated to 16 chars */
      OPENSSL_strlcpy(ascii_salt, salt, sizeof(ascii_salt));
      salt_len = strlen(ascii_salt);
  #ifdef CHARSET_EBCDIC
      ebcdic2ascii(ascii_salt, ascii_salt, salt_len);
  #endif
  
  #ifdef CHARSET_EBCDIC
      ascii_passwd = OPENSSL_strdup(passwd);
      if (ascii_passwd == NULL)
          return NULL;
      ebcdic2ascii(ascii_passwd, ascii_passwd, passwd_len);
      passwd = ascii_passwd;
  #endif
  
      out_buf[0] = 0;
      OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
      OPENSSL_strlcat(out_buf, ascii_magic, sizeof(out_buf));
      OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
      if (rounds_custom) {
          char tmp_buf[80]; /* "rounds=999999999" */
          sprintf(tmp_buf, "rounds=%u", rounds);
  #ifdef CHARSET_EBCDIC
          /* In case we're really on a ASCII based platform and just pretend */
          if (tmp_buf[0] != 0x72)  /* ASCII 'r' */
              ebcdic2ascii(tmp_buf, tmp_buf, strlen(tmp_buf));
  #endif
          OPENSSL_strlcat(out_buf, tmp_buf, sizeof(out_buf));
          OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
      }
      OPENSSL_strlcat(out_buf, ascii_salt, sizeof(out_buf));
  
      /* assert "$5$rounds=999999999$......salt......" */
      if (strlen(out_buf) > 3 + 17 * rounds_custom + salt_len )
          goto err;
  
      md = EVP_MD_CTX_new();
      if (md == NULL
          || !EVP_DigestInit_ex(md, sha, NULL)
          || !EVP_DigestUpdate(md, passwd, passwd_len)
          || !EVP_DigestUpdate(md, ascii_salt, salt_len))
          goto err;
  
      md2 = EVP_MD_CTX_new();
      if (md2 == NULL
          || !EVP_DigestInit_ex(md2, sha, NULL)
          || !EVP_DigestUpdate(md2, passwd, passwd_len)
          || !EVP_DigestUpdate(md2, ascii_salt, salt_len)
          || !EVP_DigestUpdate(md2, passwd, passwd_len)
          || !EVP_DigestFinal_ex(md2, buf, NULL))
          goto err;
  
      for (n = passwd_len; n > buf_size; n -= buf_size) {
          if (!EVP_DigestUpdate(md, buf, buf_size))
              goto err;
      }
      if (!EVP_DigestUpdate(md, buf, n))
          goto err;
  
      n = passwd_len;
      while (n) {
          if (!EVP_DigestUpdate(md,
                                (n & 1) ? buf : (const unsigned char *)passwd,
                                (n & 1) ? buf_size : passwd_len))
              goto err;
          n >>= 1;
      }
      if (!EVP_DigestFinal_ex(md, buf, NULL))
          return NULL;
  
      /* P sequence */
      if (!EVP_DigestInit_ex(md2, sha, NULL))
          goto err;
  
      for (n = passwd_len; n > 0; n--)
          if (!EVP_DigestUpdate(md2, passwd, passwd_len))
              goto err;
  
      if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))
          return NULL;
  
      if ((p_bytes = OPENSSL_zalloc(passwd_len)) == NULL)
          goto err;
      for (cp = p_bytes, n = passwd_len; n > buf_size; n -= buf_size, cp += buf_size)
          memcpy(cp, temp_buf, buf_size);
      memcpy(cp, temp_buf, n);
  
      /* S sequence */
      if (!EVP_DigestInit_ex(md2, sha, NULL))
          goto err;
  
      for (n = 16 + buf[0]; n > 0; n--)
          if (!EVP_DigestUpdate(md2, ascii_salt, salt_len))
              goto err;
  
      if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))
          return NULL;
  
      if ((s_bytes = OPENSSL_zalloc(salt_len)) == NULL)
          goto err;
      for (cp = s_bytes, n = salt_len; n > buf_size; n -= buf_size, cp += buf_size)
          memcpy(cp, temp_buf, buf_size);
      memcpy(cp, temp_buf, n);
  
      for (n = 0; n < rounds; n++) {
          if (!EVP_DigestInit_ex(md2, sha, NULL))
              goto err;
          if (!EVP_DigestUpdate(md2,
                                (n & 1) ? (const unsigned char *)p_bytes : buf,
                                (n & 1) ? passwd_len : buf_size))
              goto err;
          if (n % 3) {
              if (!EVP_DigestUpdate(md2, s_bytes, salt_len))
                  goto err;
          }
          if (n % 7) {
              if (!EVP_DigestUpdate(md2, p_bytes, passwd_len))
                  goto err;
          }
          if (!EVP_DigestUpdate(md2,
                                (n & 1) ? buf : (const unsigned char *)p_bytes,
                                (n & 1) ? buf_size : passwd_len))
                  goto err;
          if (!EVP_DigestFinal_ex(md2, buf, NULL))
                  goto err;
      }
      EVP_MD_CTX_free(md2);
      EVP_MD_CTX_free(md);
      md2 = NULL;
      md = NULL;
      OPENSSL_free(p_bytes);
      OPENSSL_free(s_bytes);
      p_bytes = NULL;
      s_bytes = NULL;
  
      cp = out_buf + strlen(out_buf);
      *cp++ = ascii_dollar[0];
  
  # define b64_from_24bit(B2, B1, B0, N)                                   \
      do {                                                                \
          unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0);             \
          int i = (N);                                                    \
          while (i-- > 0)                                                 \
              {                                                           \
                  *cp++ = cov_2char[w & 0x3f];                            \
                  w >>= 6;                                                \
              }                                                           \
      } while (0)
  
      switch (magic[0]) {
      case '5':
          b64_from_24bit (buf[0], buf[10], buf[20], 4);
          b64_from_24bit (buf[21], buf[1], buf[11], 4);
          b64_from_24bit (buf[12], buf[22], buf[2], 4);
          b64_from_24bit (buf[3], buf[13], buf[23], 4);
          b64_from_24bit (buf[24], buf[4], buf[14], 4);
          b64_from_24bit (buf[15], buf[25], buf[5], 4);
          b64_from_24bit (buf[6], buf[16], buf[26], 4);
          b64_from_24bit (buf[27], buf[7], buf[17], 4);
          b64_from_24bit (buf[18], buf[28], buf[8], 4);
          b64_from_24bit (buf[9], buf[19], buf[29], 4);
          b64_from_24bit (0, buf[31], buf[30], 3);
          break;
      case '6':
          b64_from_24bit (buf[0], buf[21], buf[42], 4);
          b64_from_24bit (buf[22], buf[43], buf[1], 4);
          b64_from_24bit (buf[44], buf[2], buf[23], 4);
          b64_from_24bit (buf[3], buf[24], buf[45], 4);
          b64_from_24bit (buf[25], buf[46], buf[4], 4);
          b64_from_24bit (buf[47], buf[5], buf[26], 4);
          b64_from_24bit (buf[6], buf[27], buf[48], 4);
          b64_from_24bit (buf[28], buf[49], buf[7], 4);
          b64_from_24bit (buf[50], buf[8], buf[29], 4);
          b64_from_24bit (buf[9], buf[30], buf[51], 4);
          b64_from_24bit (buf[31], buf[52], buf[10], 4);
          b64_from_24bit (buf[53], buf[11], buf[32], 4);
          b64_from_24bit (buf[12], buf[33], buf[54], 4);
          b64_from_24bit (buf[34], buf[55], buf[13], 4);
          b64_from_24bit (buf[56], buf[14], buf[35], 4);
          b64_from_24bit (buf[15], buf[36], buf[57], 4);
          b64_from_24bit (buf[37], buf[58], buf[16], 4);
          b64_from_24bit (buf[59], buf[17], buf[38], 4);
          b64_from_24bit (buf[18], buf[39], buf[60], 4);
          b64_from_24bit (buf[40], buf[61], buf[19], 4);
          b64_from_24bit (buf[62], buf[20], buf[41], 4);
          b64_from_24bit (0, 0, buf[63], 2);
          break;
      default:
          goto err;
      }
      *cp = '\0';
  #ifdef CHARSET_EBCDIC
      ascii2ebcdic(out_buf, out_buf, strlen(out_buf));
  #endif
  
      return out_buf;
  
   err:
      EVP_MD_CTX_free(md2);
      EVP_MD_CTX_free(md);
      OPENSSL_free(p_bytes);
      OPENSSL_free(s_bytes);
      OPENSSL_free(ascii_passwd);
      return NULL;
  }
  
  static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
                       char *passwd, BIO *out, int quiet, int table,
                       int reverse, size_t pw_maxlen, passwd_modes mode)
  {
      char *hash = NULL;
  
      assert(salt_p != NULL);
      assert(salt_malloc_p != NULL);
  
      /* first make sure we have a salt */
      if (!passed_salt) {
          size_t saltlen = 0;
          size_t i;
  
          if (mode == passwd_md5 || mode == passwd_apr1 || mode == passwd_aixmd5)
              saltlen = 8;
  
          if (mode == passwd_sha256 || mode == passwd_sha512)
              saltlen = 16;
  
          assert(saltlen != 0);
  
          if (*salt_malloc_p == NULL)
              *salt_p = *salt_malloc_p = app_malloc(saltlen + 1, "salt buffer");
          if (RAND_bytes((unsigned char *)*salt_p, saltlen) <= 0)
              goto end;
  
          for (i = 0; i < saltlen; i++)
              (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
          (*salt_p)[i] = 0;
  # ifdef CHARSET_EBCDIC
          /* The password encryption function will convert back to ASCII */
          ascii2ebcdic(*salt_p, *salt_p, saltlen);
  # endif
      }
  
      assert(*salt_p != NULL);
  
      /* truncate password if necessary */
      if ((strlen(passwd) > pw_maxlen)) {
          if (!quiet)
              /*
               * XXX: really we should know how to print a size_t, not cast it
               */
              BIO_printf(bio_err,
                         "Warning: truncating password to %u characters\n",
                         (unsigned)pw_maxlen);
          passwd[pw_maxlen] = 0;
      }
      assert(strlen(passwd) <= pw_maxlen);
  
      /* now compute password hash */
      if (mode == passwd_md5 || mode == passwd_apr1)
          hash = md5crypt(passwd, (mode == passwd_md5 ? "1" : "apr1"), *salt_p);
      if (mode == passwd_aixmd5)
          hash = md5crypt(passwd, "", *salt_p);
      if (mode == passwd_sha256 || mode == passwd_sha512)
          hash = shacrypt(passwd, (mode == passwd_sha256 ? "5" : "6"), *salt_p);
      assert(hash != NULL);
  
      if (table && !reverse)
          BIO_printf(out, "%s\t%s\n", passwd, hash);
      else if (table && reverse)
          BIO_printf(out, "%s\t%s\n", hash, passwd);
      else
          BIO_printf(out, "%s\n", hash);
      return 1;
  
   end:
      return 0;
  }
  