2 * Copyright 1995-2020 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>
14 #include <sys/types.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>
25 typedef enum OPTION_choice {
26 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
27 OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_CIPHER, OPT_VERBOSE,
28 OPT_R_ENUM, OPT_PROV_ENUM
31 const OPTIONS gendsa_options[] = {
32 {OPT_HELP_STR, 1, '-', "Usage: %s [options] dsaparam-file\n"},
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"},
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"},
45 {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
46 {"verbose", OPT_VERBOSE, '-', "Verbose output"},
49 {"dsaparam-file", 0, 0, "File containing DSA parameters"},
53 int gendsa_main(int argc, char **argv)
56 BIO *out = NULL, *in = NULL;
58 EVP_PKEY *pkey = NULL;
59 EVP_PKEY_CTX *ctx = NULL;
60 const EVP_CIPHER *enc = NULL;
61 char *dsaparams = NULL;
62 char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
64 int ret = 1, private = 0, verbose = 0;
65 const BIGNUM *p = NULL;
67 prog = opt_init(argc, argv, gendsa_options);
68 while ((o = opt_next()) != OPT_EOF) {
73 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
77 opt_help(gendsa_options);
83 passoutarg = opt_arg();
86 e = setup_engine(opt_arg(), 0);
97 if (!opt_cipher(opt_unknown(), &enc))
105 argc = opt_num_rest();
113 if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
114 BIO_printf(bio_err, "Error getting password\n");
118 in = bio_open_default(dsaparams, 'r', FORMAT_PEM);
122 if ((dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL)) == NULL) {
123 BIO_printf(bio_err, "unable to load DSA parameter file\n");
129 out = bio_open_owner(outfile, FORMAT_PEM, private);
133 DSA_get0_pqg(dsa, &p, NULL, NULL);
135 if (BN_num_bits(p) > OPENSSL_DSA_MAX_MODULUS_BITS)
137 "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
138 " Your key size is %d! Larger key size may behave not as expected.\n",
139 OPENSSL_DSA_MAX_MODULUS_BITS, BN_num_bits(p));
141 pkey = EVP_PKEY_new();
143 BIO_printf(bio_err, "unable to allocate PKEY\n");
146 if (!EVP_PKEY_set1_DSA(pkey, dsa)) {
147 BIO_printf(bio_err, "unable to associate DSA parameters with PKEY\n");
150 ctx = EVP_PKEY_CTX_new(pkey, NULL);
152 BIO_printf(bio_err, "unable to create PKEY context\n");
157 if (EVP_PKEY_keygen_init(ctx) <= 0) {
158 BIO_printf(bio_err, "unable to set up for key generation\n");
162 BIO_printf(bio_err, "Generating DSA key, %d bits\n", BN_num_bits(p));
163 if (EVP_PKEY_keygen(ctx, &pkey) <= 0) {
164 BIO_printf(bio_err, "unable to generate key\n");
169 if (!PEM_write_bio_PrivateKey(out, pkey, enc, NULL, 0, NULL, passout)) {
170 BIO_printf(bio_err, "unable to output generated key\n");
176 ERR_print_errors(bio_err);
182 EVP_PKEY_CTX_free(ctx);
184 OPENSSL_free(passout);