apps/rand.c

   1 /* apps/rand.c */
   2
   3 #include "apps.h"
   4
   5 #include <ctype.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8
   9 #include <openssl/bio.h>
  10 #include <openssl/err.h>
  11 #include <openssl/rand.h>
  12
  13 #undef PROG
  14 #define PROG rand_main
  15
  16 /* -out file         - write to file
  17  * -rand file:file   - PRNG seed files
  18  * -base64           - encode output
  19  * num               - write 'num' bytes
  20  */
  21
  22 int MAIN(int, char **);
  23
  24 int MAIN(int argc, char **argv)
  25         {
  26         ENGINE *e = NULL;
  27         int i, r, ret = 1;
  28         int badopt;
  29         char *outfile = NULL;
  30         char *inrand = NULL;
  31         int base64 = 0;
  32         BIO *out = NULL;
  33         int num = -1;
  34         char *engine=NULL;
  35
  36         apps_startup();
  37
  38         if (bio_err == NULL)
  39                 if ((bio_err = BIO_new(BIO_s_file())) != NULL)
  40                         BIO_set_fp(bio_err, stderr, BIO_NOCLOSE|BIO_FP_TEXT);
  41
  42         badopt = 0;
  43         i = 0;
  44         while (!badopt && argv[++i] != NULL)
  45                 {
  46                 if (strcmp(argv[i], "-out") == 0)
  47                         {
  48                         if ((argv[i+1] != NULL) && (outfile == NULL))
  49                                 outfile = argv[++i];
  50                         else
  51                                 badopt = 1;
  52                         }
  53                 else if (strcmp(argv[i], "-engine") == 0)
  54                         {
  55                         if ((argv[i+1] != NULL) && (engine == NULL))
  56                                 engine = argv[++i];
  57                         else
  58                                 badopt = 1;
  59                         }
  60                 else if (strcmp(argv[i], "-rand") == 0)
  61                         {
  62                         if ((argv[i+1] != NULL) && (inrand == NULL))
  63                                 inrand = argv[++i];
  64                         else
  65                                 badopt = 1;
  66                         }
  67                 else if (strcmp(argv[i], "-base64") == 0)
  68                         {
  69                         if (!base64)
  70                                 base64 = 1;
  71                         else
  72                                 badopt = 1;
  73                         }
  74                 else if (isdigit((unsigned char)argv[i][0]))
  75                         {
  76                         if (num < 0)
  77                                 {
  78                                 r = sscanf(argv[i], "%d", &num);
  79                                 if (r == 0 || num < 0)
  80                                         badopt = 1;
  81                                 }
  82                         else
  83                                 badopt = 1;
  84                         }
  85                 else
  86                         badopt = 1;
  87                 }
  88
  89         if (num < 0)
  90                 badopt = 1;
  91
  92         if (badopt)
  93                 {
  94                 BIO_printf(bio_err, "Usage: rand [options] num\n");
  95                 BIO_printf(bio_err, "where options are\n");
  96                 BIO_printf(bio_err, "-out file             - write to file\n");
  97                 BIO_printf(bio_err, "-engine e             - use engine e, possibly a hardware device.\n");
  98                 BIO_printf(bio_err, "-rand file%cfile%c... - seed PRNG from files\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
  99                 BIO_printf(bio_err, "-base64               - encode output\n");
 100                 goto err;
 101                 }
 102
 103         e = setup_engine(bio_err, engine, 0);
 104
 105         app_RAND_load_file(NULL, bio_err, (inrand != NULL));
 106         if (inrand != NULL)
 107                 BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
 108                         app_RAND_load_files(inrand));
 109
 110         out = BIO_new(BIO_s_file());
 111         if (out == NULL)
 112                 goto err;
 113         if (outfile != NULL)
 114                 r = BIO_write_filename(out, outfile);
 115         else
 116                 {
 117                 r = BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
 118 #ifdef OPENSSL_SYS_VMS
 119                 {
 120                 BIO *tmpbio = BIO_new(BIO_f_linebuffer());
 121                 out = BIO_push(tmpbio, out);
 122                 }
 123 #endif
 124                 }
 125         if (r <= 0)
 126                 goto err;
 127
 128         if (base64)
 129                 {
 130                 BIO *b64 = BIO_new(BIO_f_base64());
 131                 if (b64 == NULL)
 132                         goto err;
 133                 out = BIO_push(b64, out);
 134                 }
 135
 136         while (num > 0)
 137                 {
 138                 unsigned char buf[4096];
 139                 int chunk;
 140
 141                 chunk = num;
 142                 if (chunk > sizeof buf)
 143                         chunk = sizeof buf;
 144                 r = RAND_bytes(buf, chunk);
 145                 if (r <= 0)
 146                         goto err;
 147                 BIO_write(out, buf, chunk);
 148                 num -= chunk;
 149                 }
 150         BIO_flush(out);
 151
 152         app_RAND_write_file(NULL, bio_err);
 153         ret = 0;
 154
 155 err:
 156         ERR_print_errors(bio_err);
 157         if (out)
 158                 BIO_free_all(out);
 159         apps_shutdown();
 160         EXIT(ret);
 161         }