2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
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
10 #include <openssl/opensslconf.h>
12 NON_EMPTY_TRANSLATION_UNIT
17 # include <sys/types.h>
18 # include <sys/stat.h>
21 # include <openssl/bio.h>
22 # include <openssl/err.h>
23 # include <openssl/bn.h>
24 # include <openssl/dsa.h>
25 # include <openssl/x509.h>
26 # include <openssl/pem.h>
28 typedef enum OPTION_choice {
29 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
30 OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_CIPHER, OPT_VERBOSE,
34 const OPTIONS gendsa_options[] = {
35 {OPT_HELP_STR, 1, '-', "Usage: %s [args] dsaparam-file\n"},
37 OPT_SECTION("General"),
38 {"help", OPT_HELP, '-', "Display this summary"},
39 # ifndef OPENSSL_NO_ENGINE
40 {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
43 OPT_SECTION("Output"),
44 {"out", OPT_OUT, '>', "Output the key to the specified file"},
45 {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
47 {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
48 {"verbose", OPT_VERBOSE, '-', "Verbose output"},
52 int gendsa_main(int argc, char **argv)
55 BIO *out = NULL, *in = NULL;
57 const EVP_CIPHER *enc = NULL;
58 char *dsaparams = NULL;
59 char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
61 int ret = 1, private = 0, verbose = 0;
62 const BIGNUM *p = NULL;
64 prog = opt_init(argc, argv, gendsa_options);
65 while ((o = opt_next()) != OPT_EOF) {
70 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
74 opt_help(gendsa_options);
80 passoutarg = opt_arg();
83 e = setup_engine(opt_arg(), 0);
90 if (!opt_cipher(opt_unknown(), &enc))
98 argc = opt_num_rest();
106 if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
107 BIO_printf(bio_err, "Error getting password\n");
111 in = bio_open_default(dsaparams, 'r', FORMAT_PEM);
115 if ((dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL)) == NULL) {
116 BIO_printf(bio_err, "unable to load DSA parameter file\n");
122 out = bio_open_owner(outfile, FORMAT_PEM, private);
126 DSA_get0_pqg(dsa, &p, NULL, NULL);
128 if (BN_num_bits(p) > OPENSSL_DSA_MAX_MODULUS_BITS)
130 "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
131 " Your key size is %d! Larger key size may behave not as expected.\n",
132 OPENSSL_DSA_MAX_MODULUS_BITS, BN_num_bits(p));
135 BIO_printf(bio_err, "Generating DSA key, %d bits\n", BN_num_bits(p));
136 if (!DSA_generate_key(dsa))
140 if (!PEM_write_bio_DSAPrivateKey(out, dsa, enc, NULL, 0, NULL, passout))
145 ERR_print_errors(bio_err);
151 OPENSSL_free(passout);