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