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 #include <openssl/engine.h>
  13
  14 #undef PROG
  15 #define PROG rand_main
  16
  17 /* -out file         - write to file
  18  * -rand file:file   - PRNG seed files
  19  * -base64           - encode output
  20  * num               - write 'num' bytes
  21  */
  22
  23 int MAIN(int, char **);
  24
  25 int MAIN(int argc, char **argv)
  26         {
  27         ENGINE *e = NULL;
  28         int i, r, ret = 1;
  29         int badopt;
  30         char *outfile = NULL;
  31         char *inrand = NULL;
  32         int base64 = 0;
  33         BIO *out = NULL;
  34         int num = -1;
  35         char *engine=NULL;
  36
  37         apps_startup();
  38
  39         if (bio_err == NULL)
  40                 if ((bio_err = BIO_new(BIO_s_file())) != NULL)
  41                         BIO_set_fp(bio_err, stderr, BIO_NOCLOSE|BIO_FP_TEXT);
  42
  43         badopt = 0;
  44         i = 0;
  45         while (!badopt && argv[++i] != NULL)
  46                 {
  47                 if (strcmp(argv[i], "-out") == 0)
  48                         {
  49                         if ((argv[i+1] != NULL) && (outfile == NULL))
  50                                 outfile = argv[++i];
  51                         else
  52                                 badopt = 1;
  53                         }
  54                 if (strcmp(argv[i], "-engine") == 0)
  55                         {
  56                         if ((argv[i+1] != NULL) && (engine == NULL))
  57                                 engine = argv[++i];
  58                         else
  59                                 badopt = 1;
  60                         }
  61                 else if (strcmp(argv[i], "-rand") == 0)
  62                         {
  63                         if ((argv[i+1] != NULL) && (inrand == NULL))
  64                                 inrand = argv[++i];
  65                         else
  66                                 badopt = 1;
  67                         }
  68                 else if (strcmp(argv[i], "-base64") == 0)
  69                         {
  70                         if (!base64)
  71                                 base64 = 1;
  72                         else
  73                                 badopt = 1;
  74                         }
  75                 else if (isdigit((unsigned char)argv[i][0]))
  76                         {
  77                         if (num < 0)
  78                                 {
  79                                 r = sscanf(argv[i], "%d", &num);
  80                                 if (r == 0 || num < 0)
  81                                         badopt = 1;
  82                                 }
  83                         else
  84                                 badopt = 1;
  85                         }
  86                 else
  87                         badopt = 1;
  88                 }
  89
  90         if (num < 0)
  91                 badopt = 1;
  92
  93         if (badopt)
  94                 {
  95                 BIO_printf(bio_err, "Usage: rand [options] num\n");
  96                 BIO_printf(bio_err, "where options are\n");
  97                 BIO_printf(bio_err, "-out file             - write to file\n");
  98                 BIO_printf(bio_err," -engine e             - use engine e, possibly a hardware device.\n");
  99                 BIO_printf(bio_err, "-rand file%cfile%c... - seed PRNG from files\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
 100                 BIO_printf(bio_err, "-base64               - encode output\n");
 101                 goto err;
 102                 }
 103
 104         if (engine != NULL)
 105                 {
 106                 if((e = ENGINE_by_id(engine)) == NULL)
 107                         {
 108                         BIO_printf(bio_err,"invalid engine \"%s\"\n",
 109                                 engine);
 110                         goto err;
 111                         }
 112                 if(!ENGINE_set_default(e, ENGINE_METHOD_ALL))
 113                         {
 114                         BIO_printf(bio_err,"can't use that engine\n");
 115                         goto err;
 116                         }
 117                 BIO_printf(bio_err,"engine \"%s\" set.\n", engine);
 118                 /* Free our "structural" reference. */
 119                 ENGINE_free(e);
 120                 }
 121
 122         app_RAND_load_file(NULL, bio_err, (inrand != NULL));
 123         if (inrand != NULL)
 124                 BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
 125                         app_RAND_load_files(inrand));
 126
 127         out = BIO_new(BIO_s_file());
 128         if (out == NULL)
 129                 goto err;
 130         if (outfile != NULL)
 131                 r = BIO_write_filename(out, outfile);
 132         else
 133                 {
 134                 r = BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
 135 #ifdef VMS
 136                 {
 137                 BIO *tmpbio = BIO_new(BIO_f_linebuffer());
 138                 out = BIO_push(tmpbio, out);
 139                 }
 140 #endif
 141                 }
 142         if (r <= 0)
 143                 goto err;
 144
 145         if (base64)
 146                 {
 147                 BIO *b64 = BIO_new(BIO_f_base64());
 148                 if (b64 == NULL)
 149                         goto err;
 150                 out = BIO_push(b64, out);
 151                 }
 152
 153         while (num > 0)
 154                 {
 155                 unsigned char buf[4096];
 156                 int chunk;
 157
 158                 chunk = num;
 159                 if (chunk > sizeof buf)
 160                         chunk = sizeof buf;
 161                 r = RAND_bytes(buf, chunk);
 162                 if (r <= 0)
 163                         goto err;
 164                 BIO_write(out, buf, chunk);
 165                 num -= chunk;
 166                 }
 167         BIO_flush(out);
 168
 169         app_RAND_write_file(NULL, bio_err);
 170         ret = 0;
 171
 172 err:
 173         ERR_print_errors(bio_err);
 174         if (out)
 175                 BIO_free_all(out);
 176         EXIT(ret);
 177         }