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