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      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,
     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 
     48     OPT_PARAMETERS(),
     49     {"dsaparam-file", 0, 0, "File containing DSA parameters"},
     50     {NULL}
     51 };
     52 
     53 int gendsa_main(int argc, char **argv)
     54 {
     55     ENGINE *e = NULL;
     56     BIO *out = NULL, *in = NULL;
     57     EVP_PKEY *pkey = NULL;
     58     EVP_PKEY_CTX *ctx = NULL;
     59     EVP_CIPHER *enc = NULL;
     60     char *dsaparams = NULL, *ciphername = NULL;
     61     char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
     62     OPTION_CHOICE o;
     63     int ret = 1, private = 0, verbose = 0, nbits;
     64 
     65     prog = opt_init(argc, argv, gendsa_options);
     66     while ((o = opt_next()) != OPT_EOF) {
     67         switch (o) {
     68         case OPT_EOF:
     69         case OPT_ERR:
     70  opthelp:
     71             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
     72             goto end;
     73         case OPT_HELP:
     74             ret = 0;
     75             opt_help(gendsa_options);
     76             goto end;
     77         case OPT_OUT:
     78             outfile = opt_arg();
     79             break;
     80         case OPT_PASSOUT:
     81             passoutarg = opt_arg();
     82             break;
     83         case OPT_ENGINE:
     84             e = setup_engine(opt_arg(), 0);
     85             break;
     86         case OPT_R_CASES:
     87             if (!opt_rand(o))
     88                 goto end;
     89             break;
     90         case OPT_PROV_CASES:
     91             if (!opt_provider(o))
     92                 goto end;
     93             break;
     94         case OPT_CIPHER:
     95             ciphername = opt_unknown();
     96             break;
     97         case OPT_VERBOSE:
     98             verbose = 1;
     99             break;
    100         }
    101     }
    102 
    103     /* One argument, the params file. */
    104     argc = opt_num_rest();
    105     argv = opt_rest();
    106     if (argc != 1)
    107         goto opthelp;
    108     dsaparams = argv[0];
    109 
    110     if (!app_RAND_load())
    111         goto end;
    112 
    113     if (ciphername != NULL) {
    114         if (!opt_cipher(ciphername, &enc))
    115             goto end;
    116     }
    117     private = 1;
    118 
    119     if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
    120         BIO_printf(bio_err, "Error getting password\n");
    121         goto end;
    122     }
    123 
    124     pkey = load_keyparams(dsaparams, FORMAT_UNDEF, 1, "DSA", "DSA parameters");
    125 
    126     out = bio_open_owner(outfile, FORMAT_PEM, private);
    127     if (out == NULL)
    128         goto end2;
    129 
    130     nbits = EVP_PKEY_get_bits(pkey);
    131     if (nbits > OPENSSL_DSA_MAX_MODULUS_BITS)
    132         BIO_printf(bio_err,
    133                    "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
    134                    "         Your key size is %d! Larger key size may behave not as expected.\n",
    135                    OPENSSL_DSA_MAX_MODULUS_BITS, EVP_PKEY_get_bits(pkey));
    136 
    137     ctx = EVP_PKEY_CTX_new_from_pkey(app_get0_libctx(), pkey, app_get0_propq());
    138     if (ctx == NULL) {
    139         BIO_printf(bio_err, "unable to create PKEY context\n");
    140         goto end;
    141     }
    142     EVP_PKEY_free(pkey);
    143     pkey = NULL;
    144     if (EVP_PKEY_keygen_init(ctx) <= 0) {
    145         BIO_printf(bio_err, "unable to set up for key generation\n");
    146         goto end;
    147     }
    148     pkey = app_keygen(ctx, "DSA", nbits, verbose);
    149     if (pkey == NULL)
    150         goto end;
    151 
    152     assert(private);
    153     if (!PEM_write_bio_PrivateKey(out, pkey, enc, NULL, 0, NULL, passout)) {
    154         BIO_printf(bio_err, "unable to output generated key\n");
    155         goto end;
    156     }
    157     ret = 0;
    158  end:
    159     if (ret != 0)
    160         ERR_print_errors(bio_err);
    161  end2:
    162     BIO_free(in);
    163     BIO_free_all(out);
    164     EVP_PKEY_free(pkey);
    165     EVP_PKEY_CTX_free(ctx);
    166     EVP_CIPHER_free(enc);
    167     release_engine(e);
    168     OPENSSL_free(passout);
    169     return ret;
    170 }
    171