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_PASSOUT, OPT_CIPHER,
  37     OPT_R_ENUM
  38 } OPTION_CHOICE;
  39
  40 const OPTIONS genrsa_options[] = {
  41     {"help", OPT_HELP, '-', "Display this summary"},
  42     {"3", OPT_3, '-', "Use 3 for the E value"},
  43     {"F4", OPT_F4, '-', "Use F4 (0x10001) for the E value"},
  44     {"f4", OPT_F4, '-', "Use F4 (0x10001) for the E value"},
  45     {"out", OPT_OUT, 's', "Output the key to specified file"},
  46     OPT_R_OPTIONS,
  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 *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 opthelp:
  82             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  83             goto end;
  84         case OPT_HELP:
  85             ret = 0;
  86             opt_help(genrsa_options);
  87             goto end;
  88         case OPT_3:
  89             f4 = 3;
  90             break;
  91         case OPT_F4:
  92             f4 = RSA_F4;
  93             break;
  94         case OPT_OUT:
  95             outfile = opt_arg();
  96             break;
  97         case OPT_ENGINE:
  98             eng = setup_engine(opt_arg(), 0);
  99             break;
 100         case OPT_R_CASES:
 101             if (!opt_rand(o))
 102                 goto end;
 103             break;
 104         case OPT_PASSOUT:
 105             passoutarg = opt_arg();
 106             break;
 107         case OPT_CIPHER:
 108             if (!opt_cipher(opt_unknown(), &enc))
 109                 goto end;
 110             break;
 111         }
 112     }
 113     argc = opt_num_rest();
 114     argv = opt_rest();
 115
 116     if (argc == 1) {
 117         if (!opt_int(argv[0], &num) || num <= 0)
 118             goto end;
 119     } else if (argc > 0) {
 120         BIO_printf(bio_err, "Extra arguments given.\n");
 121         goto opthelp;
 122     }
 123
 124     private = 1;
 125     if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
 126         BIO_printf(bio_err, "Error getting password\n");
 127         goto end;
 128     }
 129
 130     out = bio_open_owner(outfile, FORMAT_PEM, private);
 131     if (out == NULL)
 132         goto end;
 133
 134     BIO_printf(bio_err, "Generating RSA private key, %d bit long modulus\n",
 135                num);
 136     rsa = eng ? RSA_new_method(eng) : RSA_new();
 137     if (rsa == NULL)
 138         goto end;
 139
 140     if (!BN_set_word(bn, f4) || !RSA_generate_key_ex(rsa, num, bn, cb))
 141         goto end;
 142
 143     RSA_get0_key(rsa, NULL, &e, NULL);
 144     hexe = BN_bn2hex(e);
 145     dece = BN_bn2dec(e);
 146     if (hexe && dece) {
 147         BIO_printf(bio_err, "e is %s (0x%s)\n", dece, hexe);
 148     }
 149     OPENSSL_free(hexe);
 150     OPENSSL_free(dece);
 151     cb_data.password = passout;
 152     cb_data.prompt_info = outfile;
 153     assert(private);
 154     if (!PEM_write_bio_RSAPrivateKey(out, rsa, enc, NULL, 0,
 155                                      (pem_password_cb *)password_callback,
 156                                      &cb_data))
 157         goto end;
 158
 159     ret = 0;
 160  end:
 161     BN_free(bn);
 162     BN_GENCB_free(cb);
 163     RSA_free(rsa);
 164     BIO_free_all(out);
 165     release_engine(eng);
 166     OPENSSL_free(passout);
 167     if (ret != 0)
 168         ERR_print_errors(bio_err);
 169     return (ret);
 170 }
 171
 172 static int genrsa_cb(int p, int n, BN_GENCB *cb)
 173 {
 174     char c = '*';
 175
 176     if (p == 0)
 177         c = '.';
 178     if (p == 1)
 179         c = '+';
 180     if (p == 2)
 181         c = '*';
 182     if (p == 3)
 183         c = '\n';
 184     BIO_write(BN_GENCB_get_arg(cb), &c, 1);
 185     (void)BIO_flush(BN_GENCB_get_arg(cb));
 186     return 1;
 187 }
 188 #endif