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     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
  30     {"help", OPT_HELP, '-', "Display this summary"},
  31     {"out", OPT_OUT, '>', "Output file"},
  32     OPT_R_OPTIONS,
  33     {"base64", OPT_BASE64, '-', "Base64 encode output"},
  34     {"hex", OPT_HEX, '-', "Hex encode output"},
  35 #ifndef OPENSSL_NO_ENGINE
  36     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  37 #endif
  38     {NULL}
  39 };
  40
  41 int rand_main(int argc, char **argv)
  42 {
  43     ENGINE *e = NULL;
  44     BIO *out = NULL;
  45     char *outfile = NULL, *prog;
  46     OPTION_CHOICE o;
  47     int format = FORMAT_BINARY, i, num = -1, r, ret = 1;
  48
  49     prog = opt_init(argc, argv, rand_options);
  50     while ((o = opt_next()) != OPT_EOF) {
  51         switch (o) {
  52         case OPT_EOF:
  53         case OPT_ERR:
  54  opthelp:
  55             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  56             goto end;
  57         case OPT_HELP:
  58             opt_help(rand_options);
  59             ret = 0;
  60             goto end;
  61         case OPT_OUT:
  62             outfile = opt_arg();
  63             break;
  64         case OPT_ENGINE:
  65             e = setup_engine(opt_arg(), 0);
  66             break;
  67         case OPT_R_CASES:
  68             if (!opt_rand(o))
  69                 goto end;
  70             break;
  71         case OPT_BASE64:
  72             format = FORMAT_BASE64;
  73             break;
  74         case OPT_HEX:
  75             format = FORMAT_TEXT;
  76             break;
  77         }
  78     }
  79     argc = opt_num_rest();
  80     argv = opt_rest();
  81     if (argc == 1) {
  82         if (!opt_int(argv[0], &num) || num <= 0)
  83             goto end;
  84     } else if (argc > 0) {
  85         BIO_printf(bio_err, "Extra arguments given.\n");
  86         goto opthelp;
  87     }
  88
  89     out = bio_open_default(outfile, 'w', format);
  90     if (out == NULL)
  91         goto end;
  92
  93     if (format == FORMAT_BASE64) {
  94         BIO *b64 = BIO_new(BIO_f_base64());
  95         if (b64 == NULL)
  96             goto end;
  97         out = BIO_push(b64, out);
  98     }
  99
 100     while (num > 0) {
 101         unsigned char buf[4096];
 102         int chunk;
 103
 104         chunk = num;
 105         if (chunk > (int)sizeof(buf))
 106             chunk = sizeof(buf);
 107         r = RAND_bytes(buf, chunk);
 108         if (r <= 0)
 109             goto end;
 110         if (format != FORMAT_TEXT) {
 111             if (BIO_write(out, buf, chunk) != chunk)
 112                 goto end;
 113         } else {
 114             for (i = 0; i < chunk; i++)
 115                 if (BIO_printf(out, "%02x", buf[i]) != 2)
 116                     goto end;
 117         }
 118         num -= chunk;
 119     }
 120     if (format == FORMAT_TEXT)
 121         BIO_puts(out, "\n");
 122     if (BIO_flush(out) <= 0)
 123         goto end;
 124
 125     ret = 0;
 126
 127  end:
 128     if (ret != 0)
 129         ERR_print_errors(bio_err);
 130     release_engine(e);
 131     BIO_free_all(out);
 132     return ret;
 133 }