apps/rand.c

   1 /*
   2  * Copyright 1998-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 #include "apps.h"
  11 #include "progs.h"
  12
  13 #include <ctype.h>
  14 #include <stdio.h>
  15 #include <string.h>
  16
  17 #include <openssl/bio.h>
  18 #include <openssl/err.h>
  19 #include <openssl/rand.h>
  20
  21 typedef enum OPTION_choice {
  22     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  23     OPT_OUT, OPT_ENGINE, OPT_BASE64, OPT_HEX,
  24     OPT_R_ENUM, OPT_PROV_ENUM
  25 } OPTION_CHOICE;
  26
  27 const OPTIONS rand_options[] = {
  28     {OPT_HELP_STR, 1, '-', "Usage: %s [options] num\n"},
  29
  30     OPT_SECTION("General"),
  31     {"help", OPT_HELP, '-', "Display this summary"},
  32 #ifndef OPENSSL_NO_ENGINE
  33     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  34 #endif
  35
  36     OPT_SECTION("Output"),
  37     {"out", OPT_OUT, '>', "Output file"},
  38     {"base64", OPT_BASE64, '-', "Base64 encode output"},
  39     {"hex", OPT_HEX, '-', "Hex encode output"},
  40
  41     OPT_R_OPTIONS,
  42     OPT_PROV_OPTIONS,
  43
  44     OPT_PARAMETERS(),
  45     {"num", 0, 0, "Number of bytes to generate"},
  46     {NULL}
  47 };
  48
  49 int rand_main(int argc, char **argv)
  50 {
  51     ENGINE *e = NULL;
  52     BIO *out = NULL;
  53     char *outfile = NULL, *prog;
  54     OPTION_CHOICE o;
  55     int format = FORMAT_BINARY, i, num = -1, r, ret = 1;
  56
  57     prog = opt_init(argc, argv, rand_options);
  58     while ((o = opt_next()) != OPT_EOF) {
  59         switch (o) {
  60         case OPT_EOF:
  61         case OPT_ERR:
  62  opthelp:
  63             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  64             goto end;
  65         case OPT_HELP:
  66             opt_help(rand_options);
  67             ret = 0;
  68             goto end;
  69         case OPT_OUT:
  70             outfile = opt_arg();
  71             break;
  72         case OPT_ENGINE:
  73             e = setup_engine(opt_arg(), 0);
  74             break;
  75         case OPT_R_CASES:
  76             if (!opt_rand(o))
  77                 goto end;
  78             break;
  79         case OPT_BASE64:
  80             format = FORMAT_BASE64;
  81             break;
  82         case OPT_HEX:
  83             format = FORMAT_TEXT;
  84             break;
  85         case OPT_PROV_CASES:
  86             if (!opt_provider(o))
  87                 goto end;
  88             break;
  89         }
  90     }
  91
  92     /* Optional argument is number of bytes to generate. */
  93     argc = opt_num_rest();
  94     argv = opt_rest();
  95     if (argc == 1) {
  96         if (!opt_int(argv[0], &num) || num <= 0)
  97             goto opthelp;
  98     } else if (argc != 0) {
  99         goto opthelp;
 100     }
 101
 102     app_RAND_load();
 103     out = bio_open_default(outfile, 'w', format);
 104     if (out == NULL)
 105         goto end;
 106
 107     if (format == FORMAT_BASE64) {
 108         BIO *b64 = BIO_new(BIO_f_base64());
 109         if (b64 == NULL)
 110             goto end;
 111         out = BIO_push(b64, out);
 112     }
 113
 114     while (num > 0) {
 115         unsigned char buf[4096];
 116         int chunk;
 117
 118         chunk = num;
 119         if (chunk > (int)sizeof(buf))
 120             chunk = sizeof(buf);
 121         r = RAND_bytes(buf, chunk);
 122         if (r <= 0)
 123             goto end;
 124         if (format != FORMAT_TEXT) {
 125             if (BIO_write(out, buf, chunk) != chunk)
 126                 goto end;
 127         } else {
 128             for (i = 0; i < chunk; i++)
 129                 if (BIO_printf(out, "%02x", buf[i]) != 2)
 130                     goto end;
 131         }
 132         num -= chunk;
 133     }
 134     if (format == FORMAT_TEXT)
 135         BIO_puts(out, "\n");
 136     if (BIO_flush(out) <= 0)
 137         goto end;
 138
 139     ret = 0;
 140
 141  end:
 142     if (ret != 0)
 143         ERR_print_errors(bio_err);
 144     release_engine(e);
 145     BIO_free_all(out);
 146     return ret;
 147 }