apps/prime.c

   1 /*
   2  * Copyright 2004-2020 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 <string.h>
  11
  12 #include "apps.h"
  13 #include "progs.h"
  14 #include <openssl/bn.h>
  15
  16 typedef enum OPTION_choice {
  17     OPT_COMMON,
  18     OPT_HEX, OPT_GENERATE, OPT_BITS, OPT_SAFE, OPT_CHECKS,
  19     OPT_PROV_ENUM
  20 } OPTION_CHOICE;
  21
  22 const OPTIONS prime_options[] = {
  23     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [number...]\n"},
  24
  25     OPT_SECTION("General"),
  26     {"help", OPT_HELP, '-', "Display this summary"},
  27     {"bits", OPT_BITS, 'p', "Size of number in bits"},
  28     {"checks", OPT_CHECKS, 'p', "Number of checks"},
  29
  30     OPT_SECTION("Output"),
  31     {"hex", OPT_HEX, '-', "Hex output"},
  32     {"generate", OPT_GENERATE, '-', "Generate a prime"},
  33     {"safe", OPT_SAFE, '-',
  34      "When used with -generate, generate a safe prime"},
  35
  36     OPT_PROV_OPTIONS,
  37
  38     OPT_PARAMETERS(),
  39     {"number", 0, 0, "Number(s) to check for primality if not generating"},
  40     {NULL}
  41 };
  42
  43 int prime_main(int argc, char **argv)
  44 {
  45     BIGNUM *bn = NULL;
  46     int hex = 0, generate = 0, bits = 0, safe = 0, ret = 1;
  47     char *prog;
  48     OPTION_CHOICE o;
  49
  50     prog = opt_init(argc, argv, prime_options);
  51     while ((o = opt_next()) != OPT_EOF) {
  52         switch (o) {
  53         case OPT_EOF:
  54         case OPT_ERR:
  55 opthelp:
  56             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  57             goto end;
  58         case OPT_HELP:
  59             opt_help(prime_options);
  60             ret = 0;
  61             goto end;
  62         case OPT_HEX:
  63             hex = 1;
  64             break;
  65         case OPT_GENERATE:
  66             generate = 1;
  67             break;
  68         case OPT_BITS:
  69             bits = atoi(opt_arg());
  70             break;
  71         case OPT_SAFE:
  72             safe = 1;
  73             break;
  74         case OPT_CHECKS:
  75             /* ignore parameter and argument */
  76             opt_arg();
  77             break;
  78         case OPT_PROV_CASES:
  79             if (!opt_provider(o))
  80                 goto end;
  81             break;
  82         }
  83     }
  84
  85     /* Optional arguments are numbers to check. */
  86     argc = opt_num_rest();
  87     argv = opt_rest();
  88     if (generate) {
  89         if (argc != 0)
  90             goto opthelp;
  91     } else if (argc == 0) {
  92         goto opthelp;
  93     }
  94
  95     if (generate) {
  96         char *s;
  97
  98         if (!bits) {
  99             BIO_printf(bio_err, "Specify the number of bits.\n");
 100             goto end;
 101         }
 102         bn = BN_new();
 103         if (bn == NULL) {
 104             BIO_printf(bio_err, "Out of memory.\n");
 105             goto end;
 106         }
 107         if (!BN_generate_prime_ex(bn, bits, safe, NULL, NULL, NULL)) {
 108             BIO_printf(bio_err, "Failed to generate prime.\n");
 109             goto end;
 110         }
 111         s = hex ? BN_bn2hex(bn) : BN_bn2dec(bn);
 112         if (s == NULL) {
 113             BIO_printf(bio_err, "Out of memory.\n");
 114             goto end;
 115         }
 116         BIO_printf(bio_out, "%s\n", s);
 117         OPENSSL_free(s);
 118     } else {
 119         for ( ; *argv; argv++) {
 120             int r;
 121
 122             if (hex)
 123                 r = BN_hex2bn(&bn, argv[0]);
 124             else
 125                 r = BN_dec2bn(&bn, argv[0]);
 126
 127             if (!r) {
 128                 BIO_printf(bio_err, "Failed to process value (%s)\n", argv[0]);
 129                 goto end;
 130             }
 131
 132             BN_print(bio_out, bn);
 133             BIO_printf(bio_out, " (%s) %s prime\n",
 134                        argv[0],
 135                        BN_check_prime(bn, NULL, NULL)
 136                            ? "is" : "is not");
 137         }
 138     }
 139
 140     ret = 0;
 141  end:
 142     BN_free(bn);
 143     return ret;
 144 }