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gendsa.c revision 1.1.1.1 
      1 /*
      2  * Copyright 1995-2023 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 <openssl/opensslconf.h>
     11 
     12 #include <stdio.h>
     13 #include <string.h>
     14 #include <sys/types.h>
     15 #include <sys/stat.h>
     16 #include "apps.h"
     17 #include "progs.h"
     18 #include <openssl/bio.h>
     19 #include <openssl/err.h>
     20 #include <openssl/bn.h>
     21 #include <openssl/dsa.h>
     22 #include <openssl/x509.h>
     23 #include <openssl/pem.h>
     24 
     25 typedef enum OPTION_choice {
     26     OPT_COMMON,
     27     OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_CIPHER, OPT_VERBOSE, OPT_QUIET,
     28     OPT_R_ENUM, OPT_PROV_ENUM
     29 } OPTION_CHOICE;
     30 
     31 const OPTIONS gendsa_options[] = {
     32     {OPT_HELP_STR, 1, '-', "Usage: %s [options] dsaparam-file\n"},
     33 
     34     OPT_SECTION("General"),
     35     {"help", OPT_HELP, '-', "Display this summary"},
     36 #ifndef OPENSSL_NO_ENGINE
     37     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
     38 #endif
     39 
     40     OPT_SECTION("Output"),
     41     {"out", OPT_OUT, '>', "Output the key to the specified file"},
     42     {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
     43     OPT_R_OPTIONS,
     44     OPT_PROV_OPTIONS,
     45     {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
     46     {"verbose", OPT_VERBOSE, '-', "Verbose output"},
     47     {"quiet", OPT_QUIET, '-', "Terse output"},
     48 
     49     OPT_PARAMETERS(),
     50     {"dsaparam-file", 0, 0, "File containing DSA parameters"},
     51     {NULL}
     52 };
     53 
     54 int gendsa_main(int argc, char **argv)
     55 {
     56     ENGINE *e = NULL;
     57     BIO *out = NULL, *in = NULL;
     58     EVP_PKEY *pkey = NULL;
     59     EVP_PKEY_CTX *ctx = NULL;
     60     EVP_CIPHER *enc = NULL;
     61     char *dsaparams = NULL, *ciphername = NULL;
     62     char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
     63     OPTION_CHOICE o;
     64     int ret = 1, private = 0, verbose = 0, nbits;
     65 
     66     opt_set_unknown_name("cipher");
     67     prog = opt_init(argc, argv, gendsa_options);
     68     while ((o = opt_next()) != OPT_EOF) {
     69         switch (o) {
     70         case OPT_EOF:
     71         case OPT_ERR:
     72  opthelp:
     73             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
     74             goto end;
     75         case OPT_HELP:
     76             ret = 0;
     77             opt_help(gendsa_options);
     78             goto end;
     79         case OPT_OUT:
     80             outfile = opt_arg();
     81             break;
     82         case OPT_PASSOUT:
     83             passoutarg = opt_arg();
     84             break;
     85         case OPT_ENGINE:
     86             e = setup_engine(opt_arg(), 0);
     87             break;
     88         case OPT_R_CASES:
     89             if (!opt_rand(o))
     90                 goto end;
     91             break;
     92         case OPT_PROV_CASES:
     93             if (!opt_provider(o))
     94                 goto end;
     95             break;
     96         case OPT_CIPHER:
     97             ciphername = opt_unknown();
     98             break;
     99         case OPT_VERBOSE:
    100             verbose = 1;
    101             break;
    102         case OPT_QUIET:
    103             verbose = 0;
    104             break;
    105         }
    106     }
    107 
    108     /* One argument, the params file. */
    109     if (!opt_check_rest_arg("params file"))
    110         goto opthelp;
    111     argv = opt_rest();
    112     dsaparams = argv[0];
    113 
    114     if (!app_RAND_load())
    115         goto end;
    116 
    117     if (!opt_cipher(ciphername, &enc))
    118         goto end;
    119     private = 1;
    120 
    121     if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
    122         BIO_printf(bio_err, "Error getting password\n");
    123         goto end;
    124     }
    125 
    126     pkey = load_keyparams(dsaparams, FORMAT_UNDEF, 1, "DSA", "DSA parameters");
    127 
    128     out = bio_open_owner(outfile, FORMAT_PEM, private);
    129     if (out == NULL)
    130         goto end2;
    131 
    132     nbits = EVP_PKEY_get_bits(pkey);
    133     if (nbits > OPENSSL_DSA_MAX_MODULUS_BITS)
    134         BIO_printf(bio_err,
    135                    "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
    136                    "         Your key size is %d! Larger key size may behave not as expected.\n",
    137                    OPENSSL_DSA_MAX_MODULUS_BITS, EVP_PKEY_get_bits(pkey));
    138 
    139     ctx = EVP_PKEY_CTX_new_from_pkey(app_get0_libctx(), pkey, app_get0_propq());
    140     if (ctx == NULL) {
    141         BIO_printf(bio_err, "unable to create PKEY context\n");
    142         goto end;
    143     }
    144     EVP_PKEY_free(pkey);
    145     pkey = NULL;
    146     if (EVP_PKEY_keygen_init(ctx) <= 0) {
    147         BIO_printf(bio_err, "unable to set up for key generation\n");
    148         goto end;
    149     }
    150     pkey = app_keygen(ctx, "DSA", nbits, verbose);
    151     if (pkey == NULL)
    152         goto end;
    153 
    154     assert(private);
    155     if (!PEM_write_bio_PrivateKey(out, pkey, enc, NULL, 0, NULL, passout)) {
    156         BIO_printf(bio_err, "unable to output generated key\n");
    157         goto end;
    158     }
    159     ret = 0;
    160  end:
    161     if (ret != 0)
    162         ERR_print_errors(bio_err);
    163  end2:
    164     BIO_free(in);
    165     BIO_free_all(out);
    166     EVP_PKEY_free(pkey);
    167     EVP_PKEY_CTX_free(ctx);
    168     EVP_CIPHER_free(enc);
    169     release_engine(e);
    170     OPENSSL_free(passout);
    171     return ret;
    172 }
    173