apps/genrsa.c

   1 /*
   2  * Copyright 1995-2016 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 <openssl/opensslconf.h>
  11 #ifdef OPENSSL_NO_RSA
  12 NON_EMPTY_TRANSLATION_UNIT
  13 #else
  14
  15 # include <stdio.h>
  16 # include <string.h>
  17 # include <sys/types.h>
  18 # include <sys/stat.h>
  19 # include "apps.h"
  20 # include <openssl/bio.h>
  21 # include <openssl/err.h>
  22 # include <openssl/bn.h>
  23 # include <openssl/rsa.h>
  24 # include <openssl/evp.h>
  25 # include <openssl/x509.h>
  26 # include <openssl/pem.h>
  27 # include <openssl/rand.h>
  28
  29 # define DEFBITS 2048
  30
  31 static int genrsa_cb(int p, int n, BN_GENCB *cb);
  32
  33 typedef enum OPTION_choice {
  34     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  35     OPT_3, OPT_F4, OPT_ENGINE,
  36     OPT_OUT, OPT_RAND, OPT_PASSOUT, OPT_CIPHER
  37 } OPTION_CHOICE;
  38
  39 OPTIONS genrsa_options[] = {
  40     {"help", OPT_HELP, '-', "Display this summary"},
  41     {"3", OPT_3, '-', "Use 3 for the E value"},
  42     {"F4", OPT_F4, '-', "Use F4 (0x10001) for the E value"},
  43     {"f4", OPT_F4, '-', "Use F4 (0x10001) for the E value"},
  44     {"out", OPT_OUT, 's', "Output the key to specified file"},
  45     {"rand", OPT_RAND, 's',
  46      "Load the file(s) into the random number generator"},
  47     {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
  48     {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
  49 # ifndef OPENSSL_NO_ENGINE
  50     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  51 # endif
  52     {NULL}
  53 };
  54
  55 int genrsa_main(int argc, char **argv)
  56 {
  57     BN_GENCB *cb = BN_GENCB_new();
  58     PW_CB_DATA cb_data;
  59     ENGINE *eng = NULL;
  60     BIGNUM *bn = BN_new();
  61     BIO *out = NULL;
  62     const BIGNUM *e;
  63     RSA *rsa = NULL;
  64     const EVP_CIPHER *enc = NULL;
  65     int ret = 1, num = DEFBITS, private = 0;
  66     unsigned long f4 = RSA_F4;
  67     char *outfile = NULL, *passoutarg = NULL, *passout = NULL;
  68     char *inrand = NULL, *prog, *hexe, *dece;
  69     OPTION_CHOICE o;
  70
  71     if (bn == NULL || cb == NULL)
  72         goto end;
  73
  74     BN_GENCB_set(cb, genrsa_cb, bio_err);
  75
  76     prog = opt_init(argc, argv, genrsa_options);
  77     while ((o = opt_next()) != OPT_EOF) {
  78         switch (o) {
  79         case OPT_EOF:
  80         case OPT_ERR:
  81             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  82             goto end;
  83         case OPT_HELP:
  84             ret = 0;
  85             opt_help(genrsa_options);
  86             goto end;
  87         case OPT_3:
  88             f4 = 3;
  89             break;
  90         case OPT_F4:
  91             f4 = RSA_F4;
  92             break;
  93         case OPT_OUT:
  94             outfile = opt_arg();
  95             break;
  96         case OPT_ENGINE:
  97             eng = setup_engine(opt_arg(), 0);
  98             break;
  99         case OPT_RAND:
 100             inrand = opt_arg();
 101             break;
 102         case OPT_PASSOUT:
 103             passoutarg = opt_arg();
 104             break;
 105         case OPT_CIPHER:
 106             if (!opt_cipher(opt_unknown(), &enc))
 107                 goto end;
 108             break;
 109         }
 110     }
 111     argc = opt_num_rest();
 112     argv = opt_rest();
 113     private = 1;
 114
 115     if (argv[0] && (!opt_int(argv[0], &num) || num <= 0))
 116         goto end;
 117
 118     if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
 119         BIO_printf(bio_err, "Error getting password\n");
 120         goto end;
 121     }
 122
 123     out = bio_open_owner(outfile, FORMAT_PEM, private);
 124     if (out == NULL)
 125         goto end;
 126
 127     if (!app_RAND_load_file(NULL, 1) && inrand == NULL
 128         && !RAND_status()) {
 129         BIO_printf(bio_err,
 130                    "warning, not much extra random data, consider using the -rand option\n");
 131     }
 132     if (inrand != NULL)
 133         BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 134                    app_RAND_load_files(inrand));
 135
 136     BIO_printf(bio_err, "Generating RSA private key, %d bit long modulus\n",
 137                num);
 138     rsa = eng ? RSA_new_method(eng) : RSA_new();
 139     if (rsa == NULL)
 140         goto end;
 141
 142     if (!BN_set_word(bn, f4) || !RSA_generate_key_ex(rsa, num, bn, cb))
 143         goto end;
 144
 145     app_RAND_write_file(NULL);
 146
 147     RSA_get0_key(rsa, NULL, &e, NULL);
 148     hexe = BN_bn2hex(e);
 149     dece = BN_bn2dec(e);
 150     if (hexe && dece) {
 151         BIO_printf(bio_err, "e is %s (0x%s)\n", dece, hexe);
 152     }
 153     OPENSSL_free(hexe);
 154     OPENSSL_free(dece);
 155     cb_data.password = passout;
 156     cb_data.prompt_info = outfile;
 157     assert(private);
 158     if (!PEM_write_bio_RSAPrivateKey(out, rsa, enc, NULL, 0,
 159                                      (pem_password_cb *)password_callback,
 160                                      &cb_data))
 161         goto end;
 162
 163     ret = 0;
 164  end:
 165     BN_free(bn);
 166     BN_GENCB_free(cb);
 167     RSA_free(rsa);
 168     BIO_free_all(out);
 169     OPENSSL_free(passout);
 170     if (ret != 0)
 171         ERR_print_errors(bio_err);
 172     return (ret);
 173 }
 174
 175 static int genrsa_cb(int p, int n, BN_GENCB *cb)
 176 {
 177     char c = '*';
 178
 179     if (p == 0)
 180         c = '.';
 181     if (p == 1)
 182         c = '+';
 183     if (p == 2)
 184         c = '*';
 185     if (p == 3)
 186         c = '\n';
 187     BIO_write(BN_GENCB_get_arg(cb), &c, 1);
 188     (void)BIO_flush(BN_GENCB_get_arg(cb));
 189     return 1;
 190 }
 191 #endif