apps/rand.c

   1 /*
   2  * Copyright 1998-2018 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
  25 } OPTION_CHOICE;
  26
  27 const OPTIONS rand_options[] = {
  28     {OPT_HELP_STR, 1, '-', "Usage: %s [flags] 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     {NULL}
  43 };
  44
  45 int rand_main(int argc, char **argv)
  46 {
  47     ENGINE *e = NULL;
  48     BIO *out = NULL;
  49     char *outfile = NULL, *prog;
  50     OPTION_CHOICE o;
  51     int format = FORMAT_BINARY, i, num = -1, r, ret = 1;
  52
  53     prog = opt_init(argc, argv, rand_options);
  54     while ((o = opt_next()) != OPT_EOF) {
  55         switch (o) {
  56         case OPT_EOF:
  57         case OPT_ERR:
  58  opthelp:
  59             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  60             goto end;
  61         case OPT_HELP:
  62             opt_help(rand_options);
  63             ret = 0;
  64             goto end;
  65         case OPT_OUT:
  66             outfile = opt_arg();
  67             break;
  68         case OPT_ENGINE:
  69             e = setup_engine(opt_arg(), 0);
  70             break;
  71         case OPT_R_CASES:
  72             if (!opt_rand(o))
  73                 goto end;
  74             break;
  75         case OPT_BASE64:
  76             format = FORMAT_BASE64;
  77             break;
  78         case OPT_HEX:
  79             format = FORMAT_TEXT;
  80             break;
  81         }
  82     }
  83     argc = opt_num_rest();
  84     argv = opt_rest();
  85     if (argc == 1) {
  86         if (!opt_int(argv[0], &num) || num <= 0)
  87             goto end;
  88     } else if (argc > 0) {
  89         BIO_printf(bio_err, "Extra arguments given.\n");
  90         goto opthelp;
  91     }
  92
  93     out = bio_open_default(outfile, 'w', format);
  94     if (out == NULL)
  95         goto end;
  96
  97     if (format == FORMAT_BASE64) {
  98         BIO *b64 = BIO_new(BIO_f_base64());
  99         if (b64 == NULL)
 100             goto end;
 101         out = BIO_push(b64, out);
 102     }
 103
 104     while (num > 0) {
 105         unsigned char buf[4096];
 106         int chunk;
 107
 108         chunk = num;
 109         if (chunk > (int)sizeof(buf))
 110             chunk = sizeof(buf);
 111         r = RAND_bytes(buf, chunk);
 112         if (r <= 0)
 113             goto end;
 114         if (format != FORMAT_TEXT) {
 115             if (BIO_write(out, buf, chunk) != chunk)
 116                 goto end;
 117         } else {
 118             for (i = 0; i < chunk; i++)
 119                 if (BIO_printf(out, "%02x", buf[i]) != 2)
 120                     goto end;
 121         }
 122         num -= chunk;
 123     }
 124     if (format == FORMAT_TEXT)
 125         BIO_puts(out, "\n");
 126     if (BIO_flush(out) <= 0)
 127         goto end;
 128
 129     ret = 0;
 130
 131  end:
 132     if (ret != 0)
 133         ERR_print_errors(bio_err);
 134     release_engine(e);
 135     BIO_free_all(out);
 136     return ret;
 137 }