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_ERR = -1, OPT_EOF = 0, OPT_HELP,
  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     argc = opt_num_rest();
  85     argv = opt_rest();
  86
  87     if (generate) {
  88         if (argc != 0) {
  89             BIO_printf(bio_err, "Extra arguments given.\n");
  90             goto opthelp;
  91         }
  92     } else if (argc == 0) {
  93         BIO_printf(bio_err, "%s: No prime specified\n", prog);
  94         goto opthelp;
  95     }
  96
  97     if (generate) {
  98         char *s;
  99
 100         if (!bits) {
 101             BIO_printf(bio_err, "Specify the number of bits.\n");
 102             goto end;
 103         }
 104         bn = BN_new();
 105         if (bn == NULL) {
 106             BIO_printf(bio_err, "Out of memory.\n");
 107             goto end;
 108         }
 109         if (!BN_generate_prime_ex(bn, bits, safe, NULL, NULL, NULL)) {
 110             BIO_printf(bio_err, "Failed to generate prime.\n");
 111             goto end;
 112         }
 113         s = hex ? BN_bn2hex(bn) : BN_bn2dec(bn);
 114         if (s == NULL) {
 115             BIO_printf(bio_err, "Out of memory.\n");
 116             goto end;
 117         }
 118         BIO_printf(bio_out, "%s\n", s);
 119         OPENSSL_free(s);
 120     } else {
 121         for ( ; *argv; argv++) {
 122             int r;
 123
 124             if (hex)
 125                 r = BN_hex2bn(&bn, argv[0]);
 126             else
 127                 r = BN_dec2bn(&bn, argv[0]);
 128
 129             if (!r) {
 130                 BIO_printf(bio_err, "Failed to process value (%s)\n", argv[0]);
 131                 goto end;
 132             }
 133
 134             BN_print(bio_out, bn);
 135             BIO_printf(bio_out, " (%s) %s prime\n",
 136                        argv[0],
 137                        BN_check_prime(bn, NULL, NULL)
 138                            ? "is" : "is not");
 139         }
 140     }
 141
 142     ret = 0;
 143  end:
 144     BN_free(bn);
 145     return ret;
 146 }