apps/prime.c

   1 /*
   2  * Copyright 2004-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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 <string.h>
  11
  12 #include "apps.h"
  13 #include <openssl/bn.h>
  14
  15 typedef enum OPTION_choice {
  16     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  17     OPT_HEX, OPT_GENERATE, OPT_BITS, OPT_SAFE, OPT_CHECKS
  18 } OPTION_CHOICE;
  19
  20 const OPTIONS prime_options[] = {
  21     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [number...]\n"},
  22     {OPT_HELP_STR, 1, '-',
  23         "  number Number to check for primality\n"},
  24     {"help", OPT_HELP, '-', "Display this summary"},
  25     {"hex", OPT_HEX, '-', "Hex output"},
  26     {"generate", OPT_GENERATE, '-', "Generate a prime"},
  27     {"bits", OPT_BITS, 'p', "Size of number in bits"},
  28     {"safe", OPT_SAFE, '-',
  29      "When used with -generate, generate a safe prime"},
  30     {"checks", OPT_CHECKS, 'p', "Number of checks"},
  31     {NULL}
  32 };
  33
  34 int prime_main(int argc, char **argv)
  35 {
  36     BIGNUM *bn = NULL;
  37     int hex = 0, checks = 20, generate = 0, bits = 0, safe = 0, ret = 1;
  38     char *prog;
  39     OPTION_CHOICE o;
  40
  41     prog = opt_init(argc, argv, prime_options);
  42     while ((o = opt_next()) != OPT_EOF) {
  43         switch (o) {
  44         case OPT_EOF:
  45         case OPT_ERR:
  46 opthelp:
  47             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  48             goto end;
  49         case OPT_HELP:
  50             opt_help(prime_options);
  51             ret = 0;
  52             goto end;
  53         case OPT_HEX:
  54             hex = 1;
  55             break;
  56         case OPT_GENERATE:
  57             generate = 1;
  58             break;
  59         case OPT_BITS:
  60             bits = atoi(opt_arg());
  61             break;
  62         case OPT_SAFE:
  63             safe = 1;
  64             break;
  65         case OPT_CHECKS:
  66             checks = atoi(opt_arg());
  67             break;
  68         }
  69     }
  70     argc = opt_num_rest();
  71     argv = opt_rest();
  72
  73     if (generate) {
  74         if (argc != 0) {
  75             BIO_printf(bio_err, "Extra arguments given.\n");
  76             goto opthelp;
  77         }
  78     } else if (argc == 0) {
  79         BIO_printf(bio_err, "%s: No prime specified\n", prog);
  80         goto opthelp;
  81     }
  82
  83     if (generate) {
  84         char *s;
  85
  86         if (!bits) {
  87             BIO_printf(bio_err, "Specify the number of bits.\n");
  88             goto end;
  89         }
  90         bn = BN_new();
  91         if (bn == NULL) {
  92             BIO_printf(bio_err, "Out of memory.\n");
  93             goto end;
  94         }
  95         if (!BN_generate_prime_ex(bn, bits, safe, NULL, NULL, NULL)) {
  96             BIO_printf(bio_err, "Failed to generate prime.\n");
  97             goto end;
  98         }
  99         s = hex ? BN_bn2hex(bn) : BN_bn2dec(bn);
 100         if (s == NULL) {
 101             BIO_printf(bio_err, "Out of memory.\n");
 102             goto end;
 103         }
 104         BIO_printf(bio_out, "%s\n", s);
 105         OPENSSL_free(s);
 106     } else {
 107         for ( ; *argv; argv++) {
 108             int r;
 109
 110             if (hex)
 111                 r = BN_hex2bn(&bn, argv[0]);
 112             else
 113                 r = BN_dec2bn(&bn, argv[0]);
 114
 115             if (!r) {
 116                 BIO_printf(bio_err, "Failed to process value (%s)\n", argv[0]);
 117                 goto end;
 118             }
 119
 120             BN_print(bio_out, bn);
 121             BIO_printf(bio_out, " (%s) %s prime\n",
 122                        argv[0],
 123                        BN_is_prime_ex(bn, checks, NULL, NULL)
 124                            ? "is" : "is not");
 125         }
 126     }
 127
 128     ret = 0;
 129  end:
 130     BN_free(bn);
 131     return ret;
 132 }