apps/genrsa.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <openssl/opensslconf.h>
  59
  60 #ifndef OPENSSL_NO_RSA
  61 # include <stdio.h>
  62 # include <string.h>
  63 # include <sys/types.h>
  64 # include <sys/stat.h>
  65 # include "apps.h"
  66 # include <openssl/bio.h>
  67 # include <openssl/err.h>
  68 # include <openssl/bn.h>
  69 # include <openssl/rsa.h>
  70 # include <openssl/evp.h>
  71 # include <openssl/x509.h>
  72 # include <openssl/pem.h>
  73 # include <openssl/rand.h>
  74
  75 # define DEFBITS 2048
  76
  77 static int genrsa_cb(int p, int n, BN_GENCB *cb);
  78
  79 typedef enum OPTION_choice {
  80     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  81     OPT_3, OPT_F4, OPT_ENGINE,
  82     OPT_OUT, OPT_RAND, OPT_PASSOUT, OPT_CIPHER
  83 } OPTION_CHOICE;
  84
  85 OPTIONS genrsa_options[] = {
  86     {"help", OPT_HELP, '-', "Display this summary"},
  87     {"3", OPT_3, '-', "Use 3 for the E value"},
  88     {"F4", OPT_F4, '-', "Use F4 (0x10001) for the E value"},
  89     {"f4", OPT_F4, '-', "Use F4 (0x10001) for the E value"},
  90     {"out", OPT_OUT, 's', "Output the key to specified file"},
  91     {"rand", OPT_RAND, 's',
  92      "Load the file(s) into the random number generator"},
  93     {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
  94     {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
  95 # ifndef OPENSSL_NO_ENGINE
  96     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  97 # endif
  98     {NULL}
  99 };
 100
 101 int genrsa_main(int argc, char **argv)
 102 {
 103     BN_GENCB *cb = BN_GENCB_new();
 104     PW_CB_DATA cb_data;
 105     ENGINE *e = NULL;
 106     BIGNUM *bn = BN_new();
 107     BIO *out = NULL;
 108     RSA *rsa = NULL;
 109     const EVP_CIPHER *enc = NULL;
 110     int ret = 1, num = DEFBITS, private = 0;
 111     unsigned long f4 = RSA_F4;
 112     char *outfile = NULL, *passoutarg = NULL, *passout = NULL;
 113     char *inrand = NULL, *prog, *hexe, *dece;
 114     OPTION_CHOICE o;
 115
 116     if (bn == NULL || cb == NULL)
 117         goto end;
 118
 119     BN_GENCB_set(cb, genrsa_cb, bio_err);
 120
 121     prog = opt_init(argc, argv, genrsa_options);
 122     while ((o = opt_next()) != OPT_EOF) {
 123         switch (o) {
 124         case OPT_EOF:
 125         case OPT_ERR:
 126             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 127             goto end;
 128         case OPT_HELP:
 129             ret = 0;
 130             opt_help(genrsa_options);
 131             goto end;
 132         case OPT_3:
 133             f4 = 3;
 134             break;
 135         case OPT_F4:
 136             f4 = RSA_F4;
 137             break;
 138         case OPT_OUT:
 139             outfile = opt_arg();
 140             break;
 141         case OPT_ENGINE:
 142             e = setup_engine(opt_arg(), 0);
 143             break;
 144         case OPT_RAND:
 145             inrand = opt_arg();
 146             break;
 147         case OPT_PASSOUT:
 148             passoutarg = opt_arg();
 149             break;
 150         case OPT_CIPHER:
 151             if (!opt_cipher(opt_unknown(), &enc))
 152                 goto end;
 153             break;
 154         }
 155     }
 156     argc = opt_num_rest();
 157     argv = opt_rest();
 158     private = 1;
 159
 160     if (argv[0] && (!opt_int(argv[0], &num) || num <= 0))
 161         goto end;
 162
 163     if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
 164         BIO_printf(bio_err, "Error getting password\n");
 165         goto end;
 166     }
 167
 168     out = bio_open_owner(outfile, FORMAT_PEM, private);
 169     if (out == NULL)
 170         goto end;
 171
 172     if (!app_RAND_load_file(NULL, 1) && inrand == NULL
 173         && !RAND_status()) {
 174         BIO_printf(bio_err,
 175                    "warning, not much extra random data, consider using the -rand option\n");
 176     }
 177     if (inrand != NULL)
 178         BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 179                    app_RAND_load_files(inrand));
 180
 181     BIO_printf(bio_err, "Generating RSA private key, %d bit long modulus\n",
 182                num);
 183     rsa = e ? RSA_new_method(e) : RSA_new();
 184     if (rsa == NULL)
 185         goto end;
 186
 187     if (!BN_set_word(bn, f4) || !RSA_generate_key_ex(rsa, num, bn, cb))
 188         goto end;
 189
 190     app_RAND_write_file(NULL);
 191
 192     hexe = BN_bn2hex(rsa->e);
 193     dece = BN_bn2dec(rsa->e);
 194     if (hexe && dece) {
 195         BIO_printf(bio_err, "e is %s (0x%s)\n", dece, hexe);
 196     }
 197     OPENSSL_free(hexe);
 198     OPENSSL_free(dece);
 199     cb_data.password = passout;
 200     cb_data.prompt_info = outfile;
 201     assert(private);
 202     if (!PEM_write_bio_RSAPrivateKey(out, rsa, enc, NULL, 0,
 203                                      (pem_password_cb *)password_callback,
 204                                      &cb_data))
 205         goto end;
 206
 207     ret = 0;
 208  end:
 209     BN_free(bn);
 210     BN_GENCB_free(cb);
 211     RSA_free(rsa);
 212     BIO_free_all(out);
 213     OPENSSL_free(passout);
 214     if (ret != 0)
 215         ERR_print_errors(bio_err);
 216     return (ret);
 217 }
 218
 219 static int genrsa_cb(int p, int n, BN_GENCB *cb)
 220 {
 221     char c = '*';
 222
 223     if (p == 0)
 224         c = '.';
 225     if (p == 1)
 226         c = '+';
 227     if (p == 2)
 228         c = '*';
 229     if (p == 3)
 230         c = '\n';
 231     BIO_write(BN_GENCB_get_arg(cb), &c, 1);
 232     (void)BIO_flush(BN_GENCB_get_arg(cb));
 233     return 1;
 234 }
 235 #else                           /* !OPENSSL_NO_RSA */
 236
 237 # if PEDANTIC
 238 static void *dummy = &dummy;
 239 # endif
 240
 241 #endif