Home | History | Annotate | Line # | Download | only in apps 
      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,
     28     OPT_PASSOUT,
     29     OPT_ENGINE,
     30     OPT_CIPHER,
     31     OPT_VERBOSE,
     32     OPT_QUIET,
     33     OPT_R_ENUM,
     34     OPT_PROV_ENUM
     35 } OPTION_CHOICE;
     36 
     37 const OPTIONS gendsa_options[] = {
     38     { OPT_HELP_STR, 1, '-', "Usage: %s [options] dsaparam-file\n" },
     39 
     40     OPT_SECTION("General"),
     41     { "help", OPT_HELP, '-', "Display this summary" },
     42 #ifndef OPENSSL_NO_ENGINE
     43     { "engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device" },
     44 #endif
     45 
     46     OPT_SECTION("Output"),
     47     { "out", OPT_OUT, '>', "Output the key to the specified file" },
     48     { "passout", OPT_PASSOUT, 's', "Output file pass phrase source" },
     49     OPT_R_OPTIONS,
     50     OPT_PROV_OPTIONS,
     51     { "", OPT_CIPHER, '-', "Encrypt the output with any supported cipher" },
     52     { "verbose", OPT_VERBOSE, '-', "Verbose output" },
     53     { "quiet", OPT_QUIET, '-', "Terse output" },
     54 
     55     OPT_PARAMETERS(),
     56     { "dsaparam-file", 0, 0, "File containing DSA parameters" },
     57     { NULL }
     58 };
     59 
     60 int gendsa_main(int argc, char **argv)
     61 {
     62     ENGINE *e = NULL;
     63     BIO *out = NULL, *in = NULL;
     64     EVP_PKEY *pkey = NULL;
     65     EVP_PKEY_CTX *ctx = NULL;
     66     EVP_CIPHER *enc = NULL;
     67     char *dsaparams = NULL, *ciphername = NULL;
     68     char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
     69     OPTION_CHOICE o;
     70     int ret = 1, private = 0, verbose = 0, nbits;
     71 
     72     opt_set_unknown_name("cipher");
     73     prog = opt_init(argc, argv, gendsa_options);
     74     while ((o = opt_next()) != OPT_EOF) {
     75         switch (o) {
     76         case OPT_EOF:
     77         case OPT_ERR:
     78         opthelp:
     79             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
     80             goto end;
     81         case OPT_HELP:
     82             ret = 0;
     83             opt_help(gendsa_options);
     84             goto end;
     85         case OPT_OUT:
     86             outfile = opt_arg();
     87             break;
     88         case OPT_PASSOUT:
     89             passoutarg = opt_arg();
     90             break;
     91         case OPT_ENGINE:
     92             e = setup_engine(opt_arg(), 0);
     93             break;
     94         case OPT_R_CASES:
     95             if (!opt_rand(o))
     96                 goto end;
     97             break;
     98         case OPT_PROV_CASES:
     99             if (!opt_provider(o))
    100                 goto end;
    101             break;
    102         case OPT_CIPHER:
    103             ciphername = opt_unknown();
    104             break;
    105         case OPT_VERBOSE:
    106             verbose = 1;
    107             break;
    108         case OPT_QUIET:
    109             verbose = 0;
    110             break;
    111         }
    112     }
    113 
    114     /* One argument, the params file. */
    115     if (!opt_check_rest_arg("params file"))
    116         goto opthelp;
    117     argv = opt_rest();
    118     dsaparams = argv[0];
    119 
    120     if (!app_RAND_load())
    121         goto end;
    122 
    123     if (!opt_cipher(ciphername, &enc))
    124         goto end;
    125     private = 1;
    126 
    127     if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
    128         BIO_printf(bio_err, "Error getting password\n");
    129         goto end;
    130     }
    131 
    132     pkey = load_keyparams(dsaparams, FORMAT_UNDEF, 1, "DSA", "DSA parameters");
    133 
    134     out = bio_open_owner(outfile, FORMAT_PEM, private);
    135     if (out == NULL)
    136         goto end2;
    137 
    138     nbits = EVP_PKEY_get_bits(pkey);
    139     if (nbits > OPENSSL_DSA_MAX_MODULUS_BITS)
    140         BIO_printf(bio_err,
    141             "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
    142             "         Your key size is %d! Larger key size may behave not as expected.\n",
    143             OPENSSL_DSA_MAX_MODULUS_BITS, EVP_PKEY_get_bits(pkey));
    144 
    145     ctx = EVP_PKEY_CTX_new_from_pkey(app_get0_libctx(), pkey, app_get0_propq());
    146     if (ctx == NULL) {
    147         BIO_printf(bio_err, "unable to create PKEY context\n");
    148         goto end;
    149     }
    150     EVP_PKEY_free(pkey);
    151     pkey = NULL;
    152     if (EVP_PKEY_keygen_init(ctx) <= 0) {
    153         BIO_printf(bio_err, "unable to set up for key generation\n");
    154         goto end;
    155     }
    156     pkey = app_keygen(ctx, "DSA", nbits, verbose);
    157     if (pkey == NULL)
    158         goto end;
    159 
    160     assert(private);
    161     if (!PEM_write_bio_PrivateKey(out, pkey, enc, NULL, 0, NULL, passout)) {
    162         BIO_printf(bio_err, "unable to output generated key\n");
    163         goto end;
    164     }
    165     ret = 0;
    166 end:
    167     if (ret != 0)
    168         ERR_print_errors(bio_err);
    169 end2:
    170     BIO_free(in);
    171     BIO_free_all(out);
    172     EVP_PKEY_free(pkey);
    173     EVP_PKEY_CTX_free(ctx);
    174     EVP_CIPHER_free(enc);
    175     release_engine(e);
    176     OPENSSL_free(passout);
    177     return ret;
    178 }
    179