apps/prime.c

   1 /*
   2  * Copyright 2004-2018 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 } OPTION_CHOICE;
  20
  21 const OPTIONS prime_options[] = {
  22     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [number...]\n"},
  23
  24     OPT_SECTION("General"),
  25     {"help", OPT_HELP, '-', "Display this summary"},
  26     {"bits", OPT_BITS, 'p', "Size of number in bits"},
  27     {"checks", OPT_CHECKS, 'p', "Number of checks"},
  28
  29     OPT_SECTION("Output"),
  30     {"hex", OPT_HEX, '-', "Hex output"},
  31     {"generate", OPT_GENERATE, '-', "Generate a prime"},
  32     {"safe", OPT_SAFE, '-',
  33      "When used with -generate, generate a safe prime"},
  34
  35     OPT_PARAMETERS(),
  36     {"number", 0, 0, "Number(s) to check for primality if not generating"},
  37     {NULL}
  38 };
  39
  40 int prime_main(int argc, char **argv)
  41 {
  42     BIGNUM *bn = NULL;
  43     int hex = 0, generate = 0, bits = 0, safe = 0, ret = 1;
  44     char *prog;
  45     OPTION_CHOICE o;
  46
  47     prog = opt_init(argc, argv, prime_options);
  48     while ((o = opt_next()) != OPT_EOF) {
  49         switch (o) {
  50         case OPT_EOF:
  51         case OPT_ERR:
  52 opthelp:
  53             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  54             goto end;
  55         case OPT_HELP:
  56             opt_help(prime_options);
  57             ret = 0;
  58             goto end;
  59         case OPT_HEX:
  60             hex = 1;
  61             break;
  62         case OPT_GENERATE:
  63             generate = 1;
  64             break;
  65         case OPT_BITS:
  66             bits = atoi(opt_arg());
  67             break;
  68         case OPT_SAFE:
  69             safe = 1;
  70             break;
  71         case OPT_CHECKS:
  72             /* ignore parameter and argument */
  73             opt_arg();
  74             break;
  75         }
  76     }
  77     argc = opt_num_rest();
  78     argv = opt_rest();
  79
  80     if (generate) {
  81         if (argc != 0) {
  82             BIO_printf(bio_err, "Extra arguments given.\n");
  83             goto opthelp;
  84         }
  85     } else if (argc == 0) {
  86         BIO_printf(bio_err, "%s: No prime specified\n", prog);
  87         goto opthelp;
  88     }
  89
  90     if (generate) {
  91         char *s;
  92
  93         if (!bits) {
  94             BIO_printf(bio_err, "Specify the number of bits.\n");
  95             goto end;
  96         }
  97         bn = BN_new();
  98         if (bn == NULL) {
  99             BIO_printf(bio_err, "Out of memory.\n");
 100             goto end;
 101         }
 102         if (!BN_generate_prime_ex(bn, bits, safe, NULL, NULL, NULL)) {
 103             BIO_printf(bio_err, "Failed to generate prime.\n");
 104             goto end;
 105         }
 106         s = hex ? BN_bn2hex(bn) : BN_bn2dec(bn);
 107         if (s == NULL) {
 108             BIO_printf(bio_err, "Out of memory.\n");
 109             goto end;
 110         }
 111         BIO_printf(bio_out, "%s\n", s);
 112         OPENSSL_free(s);
 113     } else {
 114         for ( ; *argv; argv++) {
 115             int r;
 116
 117             if (hex)
 118                 r = BN_hex2bn(&bn, argv[0]);
 119             else
 120                 r = BN_dec2bn(&bn, argv[0]);
 121
 122             if (!r) {
 123                 BIO_printf(bio_err, "Failed to process value (%s)\n", argv[0]);
 124                 goto end;
 125             }
 126
 127             BN_print(bio_out, bn);
 128             BIO_printf(bio_out, " (%s) %s prime\n",
 129                        argv[0],
 130                        BN_check_prime(bn, NULL, NULL)
 131                            ? "is" : "is not");
 132         }
 133     }
 134
 135     ret = 0;
 136  end:
 137     BN_free(bn);
 138     return ret;
 139 }