2 * Copyright 1995-2021 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
{
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
;
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
;
63 int ret
= 1, private = 0, verbose
= 0, nbits
;
65 prog
= opt_init(argc
, argv
, gendsa_options
);
66 while ((o
= opt_next()) != OPT_EOF
) {
71 BIO_printf(bio_err
, "%s: Use -help for summary.\n", prog
);
75 opt_help(gendsa_options
);
81 passoutarg
= opt_arg();
84 e
= setup_engine(opt_arg(), 0);
95 ciphername
= opt_unknown();
103 /* One argument, the params file. */
104 argc
= opt_num_rest();
110 if (!app_RAND_load())
113 if (ciphername
!= NULL
) {
114 if (!opt_cipher(ciphername
, &enc
))
119 if (!app_passwd(NULL
, passoutarg
, NULL
, &passout
)) {
120 BIO_printf(bio_err
, "Error getting password\n");
124 pkey
= load_keyparams(dsaparams
, FORMAT_UNDEF
, 1, "DSA", "DSA parameters");
126 out
= bio_open_owner(outfile
, FORMAT_PEM
, private);
130 nbits
= EVP_PKEY_bits(pkey
);
131 if (nbits
> OPENSSL_DSA_MAX_MODULUS_BITS
)
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_bits(pkey
));
137 ctx
= EVP_PKEY_CTX_new(pkey
, NULL
);
139 BIO_printf(bio_err
, "unable to create PKEY context\n");
144 if (EVP_PKEY_keygen_init(ctx
) <= 0) {
145 BIO_printf(bio_err
, "unable to set up for key generation\n");
149 BIO_printf(bio_err
, "Generating DSA key, %d bits\n", nbits
);
150 if (EVP_PKEY_keygen(ctx
, &pkey
) <= 0) {
151 BIO_printf(bio_err
, "unable to generate key\n");
156 if (!PEM_write_bio_PrivateKey(out
, pkey
, enc
, NULL
, 0, NULL
, passout
)) {
157 BIO_printf(bio_err
, "unable to output generated key\n");
163 ERR_print_errors(bio_err
);
168 EVP_PKEY_CTX_free(ctx
);
169 EVP_CIPHER_free(enc
);
171 OPENSSL_free(passout
);