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,
28 OPT_PASSOUT,
29 OPT_ENGINE,
30 OPT_CIPHER,
31 OPT_VERBOSE,
32 OPT_QUIET,
33 OPT_R_ENUM,
34 OPT_PROV_ENUM
35 } OPTION_CHOICE;
36
37 const OPTIONS gendsa_options[] = {
38 { OPT_HELP_STR, 1, '-', "Usage: %s [options] dsaparam-file\n" },
39
40 OPT_SECTION("General"),
41 { "help", OPT_HELP, '-', "Display this summary" },
42 #ifndef OPENSSL_NO_ENGINE
43 { "engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device" },
44 #endif
45
46 OPT_SECTION("Output"),
47 { "out", OPT_OUT, '>', "Output the key to the specified file" },
48 { "passout", OPT_PASSOUT, 's', "Output file pass phrase source" },
49 OPT_R_OPTIONS,
50 OPT_PROV_OPTIONS,
51 { "", OPT_CIPHER, '-', "Encrypt the output with any supported cipher" },
52 { "verbose", OPT_VERBOSE, '-', "Verbose output" },
53 { "quiet", OPT_QUIET, '-', "Terse output" },
54
55 OPT_PARAMETERS(),
56 { "dsaparam-file", 0, 0, "File containing DSA parameters" },
57 { NULL }
58 };
59
gendsa_main(int argc,char ** argv)60 int gendsa_main(int argc, char **argv)
61 {
62 ENGINE *e = NULL;
63 BIO *out = NULL, *in = NULL;
64 EVP_PKEY *pkey = NULL;
65 EVP_PKEY_CTX *ctx = NULL;
66 EVP_CIPHER *enc = NULL;
67 char *dsaparams = NULL, *ciphername = NULL;
68 char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
69 OPTION_CHOICE o;
70 int ret = 1, private = 0, verbose = 0, nbits;
71
72 opt_set_unknown_name("cipher");
73 prog = opt_init(argc, argv, gendsa_options);
74 while ((o = opt_next()) != OPT_EOF) {
75 switch (o) {
76 case OPT_EOF:
77 case OPT_ERR:
78 opthelp:
79 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
80 goto end;
81 case OPT_HELP:
82 ret = 0;
83 opt_help(gendsa_options);
84 goto end;
85 case OPT_OUT:
86 outfile = opt_arg();
87 break;
88 case OPT_PASSOUT:
89 passoutarg = opt_arg();
90 break;
91 case OPT_ENGINE:
92 e = setup_engine(opt_arg(), 0);
93 break;
94 case OPT_R_CASES:
95 if (!opt_rand(o))
96 goto end;
97 break;
98 case OPT_PROV_CASES:
99 if (!opt_provider(o))
100 goto end;
101 break;
102 case OPT_CIPHER:
103 ciphername = opt_unknown();
104 break;
105 case OPT_VERBOSE:
106 verbose = 1;
107 break;
108 case OPT_QUIET:
109 verbose = 0;
110 break;
111 }
112 }
113
114 /* One argument, the params file. */
115 if (!opt_check_rest_arg("params file"))
116 goto opthelp;
117 argv = opt_rest();
118 dsaparams = argv[0];
119
120 if (!app_RAND_load())
121 goto end;
122
123 if (!opt_cipher(ciphername, &enc))
124 goto end;
125 private = 1;
126
127 if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
128 BIO_printf(bio_err, "Error getting password\n");
129 goto end;
130 }
131
132 pkey = load_keyparams(dsaparams, FORMAT_UNDEF, 1, "DSA", "DSA parameters");
133
134 out = bio_open_owner(outfile, FORMAT_PEM, private);
135 if (out == NULL)
136 goto end2;
137
138 nbits = EVP_PKEY_get_bits(pkey);
139 if (nbits > OPENSSL_DSA_MAX_MODULUS_BITS)
140 BIO_printf(bio_err,
141 "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
142 " Your key size is %d! Larger key size may behave not as expected.\n",
143 OPENSSL_DSA_MAX_MODULUS_BITS, EVP_PKEY_get_bits(pkey));
144
145 ctx = EVP_PKEY_CTX_new_from_pkey(app_get0_libctx(), pkey, app_get0_propq());
146 if (ctx == NULL) {
147 BIO_printf(bio_err, "unable to create PKEY context\n");
148 goto end;
149 }
150 EVP_PKEY_free(pkey);
151 pkey = NULL;
152 if (EVP_PKEY_keygen_init(ctx) <= 0) {
153 BIO_printf(bio_err, "unable to set up for key generation\n");
154 goto end;
155 }
156 pkey = app_keygen(ctx, "DSA", nbits, verbose);
157 if (pkey == NULL)
158 goto end;
159
160 assert(private);
161 if (!PEM_write_bio_PrivateKey(out, pkey, enc, NULL, 0, NULL, passout)) {
162 BIO_printf(bio_err, "unable to output generated key\n");
163 goto end;
164 }
165 ret = 0;
166 end:
167 if (ret != 0)
168 ERR_print_errors(bio_err);
169 end2:
170 BIO_free(in);
171 BIO_free_all(out);
172 EVP_PKEY_free(pkey);
173 EVP_PKEY_CTX_free(ctx);
174 EVP_CIPHER_free(enc);
175 release_engine(e);
176 OPENSSL_free(passout);
177 return ret;
178 }
179