Home | History | Annotate | Line # | Download | only in apps 
      1 /*
      2  * Copyright 1995-2020 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 #include <stdio.h>
     12 #include <string.h>
     13 #include <sys/types.h>
     14 #include <sys/stat.h>
     15 #include "apps.h"
     16 #include "progs.h"
     17 #include <openssl/bio.h>
     18 #include <openssl/err.h>
     19 #include <openssl/bn.h>
     20 #include <openssl/dsa.h>
     21 #include <openssl/x509.h>
     22 #include <openssl/pem.h>
     23 
     24 typedef enum OPTION_choice {
     25     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
     26     OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_CIPHER,
     27     OPT_R_ENUM
     28 } OPTION_CHOICE;
     29 
     30 const OPTIONS gendsa_options[] = {
     31     {OPT_HELP_STR, 1, '-', "Usage: %s [args] dsaparam-file\n"},
     32     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
     33     {"help", OPT_HELP, '-', "Display this summary"},
     34     {"out", OPT_OUT, '>', "Output the key to the specified file"},
     35     {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
     36     OPT_R_OPTIONS,
     37     {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
     38 #ifndef OPENSSL_NO_ENGINE
     39     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
     40 #endif
     41     {NULL}
     42 };
     43 
     44 int gendsa_main(int argc, char **argv)
     45 {
     46     ENGINE *e = NULL;
     47     BIO *out = NULL, *in = NULL;
     48     DSA *dsa = NULL;
     49     const EVP_CIPHER *enc = NULL;
     50     char *dsaparams = NULL;
     51     char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
     52     OPTION_CHOICE o;
     53     int ret = 1, private = 0;
     54     const BIGNUM *p = NULL;
     55 
     56     prog = opt_init(argc, argv, gendsa_options);
     57     while ((o = opt_next()) != OPT_EOF) {
     58         switch (o) {
     59         case OPT_EOF:
     60         case OPT_ERR:
     61  opthelp:
     62             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
     63             goto end;
     64         case OPT_HELP:
     65             ret = 0;
     66             opt_help(gendsa_options);
     67             goto end;
     68         case OPT_OUT:
     69             outfile = opt_arg();
     70             break;
     71         case OPT_PASSOUT:
     72             passoutarg = opt_arg();
     73             break;
     74         case OPT_ENGINE:
     75             e = setup_engine(opt_arg(), 0);
     76             break;
     77         case OPT_R_CASES:
     78             if (!opt_rand(o))
     79                 goto end;
     80             break;
     81         case OPT_CIPHER:
     82             if (!opt_cipher(opt_unknown(), &enc))
     83                 goto end;
     84             break;
     85         }
     86     }
     87     argc = opt_num_rest();
     88     argv = opt_rest();
     89     private = 1;
     90 
     91     if (argc != 1)
     92         goto opthelp;
     93     dsaparams = *argv;
     94 
     95     if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
     96         BIO_printf(bio_err, "Error getting password\n");
     97         goto end;
     98     }
     99 
    100     in = bio_open_default(dsaparams, 'r', FORMAT_PEM);
    101     if (in == NULL)
    102         goto end2;
    103 
    104     if ((dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL)) == NULL) {
    105         BIO_printf(bio_err, "unable to load DSA parameter file\n");
    106         goto end;
    107     }
    108     BIO_free(in);
    109     in = NULL;
    110 
    111     out = bio_open_owner(outfile, FORMAT_PEM, private);
    112     if (out == NULL)
    113         goto end2;
    114 
    115     DSA_get0_pqg(dsa, &p, NULL, NULL);
    116 
    117     if (BN_num_bits(p) > OPENSSL_DSA_MAX_MODULUS_BITS)
    118         BIO_printf(bio_err,
    119                    "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
    120                    "         Your key size is %d! Larger key size may behave not as expected.\n",
    121                    OPENSSL_DSA_MAX_MODULUS_BITS, BN_num_bits(p));
    122 
    123     BIO_printf(bio_err, "Generating DSA key, %d bits\n", BN_num_bits(p));
    124     if (!DSA_generate_key(dsa))
    125         goto end;
    126 
    127     assert(private);
    128     if (!PEM_write_bio_DSAPrivateKey(out, dsa, enc, NULL, 0, NULL, passout))
    129         goto end;
    130     ret = 0;
    131  end:
    132     if (ret != 0)
    133         ERR_print_errors(bio_err);
    134  end2:
    135     BIO_free(in);
    136     BIO_free_all(out);
    137     DSA_free(dsa);
    138     release_engine(e);
    139     OPENSSL_free(passout);
    140     return ret;
    141 }
    142