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 <stdlib.h>
14 #include <time.h>
15 #include <string.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 static int verbose = 0;
26
27 typedef enum OPTION_choice {
28 OPT_COMMON,
29 OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT,
30 OPT_NOOUT, OPT_GENKEY, OPT_ENGINE, OPT_VERBOSE, OPT_QUIET,
31 OPT_R_ENUM, OPT_PROV_ENUM
32 } OPTION_CHOICE;
33
34 const OPTIONS dsaparam_options[] = {
35 {OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits] [numqbits]\n"},
36
37 OPT_SECTION("General"),
38 {"help", OPT_HELP, '-', "Display this summary"},
39 #ifndef OPENSSL_NO_ENGINE
40 {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
41 #endif
42
43 OPT_SECTION("Input"),
44 {"in", OPT_IN, '<', "Input file"},
45 {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
46
47 OPT_SECTION("Output"),
48 {"out", OPT_OUT, '>', "Output file"},
49 {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
50 {"text", OPT_TEXT, '-', "Print as text"},
51 {"noout", OPT_NOOUT, '-', "No output"},
52 {"verbose", OPT_VERBOSE, '-', "Verbose output"},
53 {"quiet", OPT_QUIET, '-', "Terse output"},
54 {"genkey", OPT_GENKEY, '-', "Generate a DSA key"},
55
56 OPT_R_OPTIONS,
57 OPT_PROV_OPTIONS,
58
59 OPT_PARAMETERS(),
60 {"numbits", 0, 0, "Number of bits if generating parameters or key (optional)"},
61 {"numqbits", 0, 0, "Number of bits in the subprime parameter q if generating parameters or key (optional)"},
62 {NULL}
63 };
64
dsaparam_main(int argc,char ** argv)65 int dsaparam_main(int argc, char **argv)
66 {
67 ENGINE *e = NULL;
68 BIO *out = NULL;
69 EVP_PKEY *params = NULL, *pkey = NULL;
70 EVP_PKEY_CTX *ctx = NULL;
71 int numbits = -1, numqbits = -1, num = 0, genkey = 0;
72 int informat = FORMAT_UNDEF, outformat = FORMAT_PEM, noout = 0;
73 int ret = 1, i, text = 0, private = 0;
74 char *infile = NULL, *outfile = NULL, *prog;
75 OPTION_CHOICE o;
76
77 prog = opt_init(argc, argv, dsaparam_options);
78 while ((o = opt_next()) != OPT_EOF) {
79 switch (o) {
80 case OPT_EOF:
81 case OPT_ERR:
82 opthelp:
83 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
84 goto end;
85 case OPT_HELP:
86 opt_help(dsaparam_options);
87 ret = 0;
88 goto end;
89 case OPT_INFORM:
90 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
91 goto opthelp;
92 break;
93 case OPT_IN:
94 infile = opt_arg();
95 break;
96 case OPT_OUTFORM:
97 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
98 goto opthelp;
99 break;
100 case OPT_OUT:
101 outfile = opt_arg();
102 break;
103 case OPT_ENGINE:
104 e = setup_engine(opt_arg(), 0);
105 break;
106 case OPT_TEXT:
107 text = 1;
108 break;
109 case OPT_GENKEY:
110 genkey = 1;
111 break;
112 case OPT_R_CASES:
113 if (!opt_rand(o))
114 goto end;
115 break;
116 case OPT_PROV_CASES:
117 if (!opt_provider(o))
118 goto end;
119 break;
120 case OPT_NOOUT:
121 noout = 1;
122 break;
123 case OPT_VERBOSE:
124 verbose = 1;
125 break;
126 case OPT_QUIET:
127 verbose = 0;
128 break;
129 }
130 }
131
132 /* Optional args are bitsize and q bitsize. */
133 argc = opt_num_rest();
134 argv = opt_rest();
135 if (argc == 2) {
136 if (!opt_int(argv[0], &num) || num < 0)
137 goto opthelp;
138 if (!opt_int(argv[1], &numqbits) || numqbits < 0)
139 goto opthelp;
140 } else if (argc == 1) {
141 if (!opt_int(argv[0], &num) || num < 0)
142 goto opthelp;
143 } else if (!opt_check_rest_arg(NULL)) {
144 goto opthelp;
145 }
146 if (!app_RAND_load())
147 goto end;
148
149 /* generate a key */
150 numbits = num;
151 private = genkey ? 1 : 0;
152
153 ctx = EVP_PKEY_CTX_new_from_name(app_get0_libctx(), "DSA", app_get0_propq());
154 if (ctx == NULL) {
155 BIO_printf(bio_err,
156 "Error, DSA parameter generation context allocation failed\n");
157 goto end;
158 }
159 if (numbits > 0) {
160 if (numbits > OPENSSL_DSA_MAX_MODULUS_BITS)
161 BIO_printf(bio_err,
162 "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
163 " Your key size is %d! Larger key size may behave not as expected.\n",
164 OPENSSL_DSA_MAX_MODULUS_BITS, numbits);
165
166 EVP_PKEY_CTX_set_app_data(ctx, bio_err);
167 if (verbose) {
168 EVP_PKEY_CTX_set_cb(ctx, progress_cb);
169 BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
170 num);
171 BIO_printf(bio_err, "This could take some time\n");
172 }
173 if (EVP_PKEY_paramgen_init(ctx) <= 0) {
174 BIO_printf(bio_err,
175 "Error, DSA key generation paramgen init failed\n");
176 goto end;
177 }
178 if (EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, num) <= 0) {
179 BIO_printf(bio_err,
180 "Error, DSA key generation setting bit length failed\n");
181 goto end;
182 }
183 if (numqbits > 0) {
184 if (EVP_PKEY_CTX_set_dsa_paramgen_q_bits(ctx, numqbits) <= 0) {
185 BIO_printf(bio_err,
186 "Error, DSA key generation setting subprime bit length failed\n");
187 goto end;
188 }
189 }
190 params = app_paramgen(ctx, "DSA");
191 } else {
192 params = load_keyparams(infile, informat, 1, "DSA", "DSA parameters");
193 }
194 if (params == NULL) {
195 /* Error message should already have been displayed */
196 goto end;
197 }
198
199 out = bio_open_owner(outfile, outformat, private);
200 if (out == NULL)
201 goto end;
202
203 if (text) {
204 EVP_PKEY_print_params(out, params, 0, NULL);
205 }
206
207 if (outformat == FORMAT_ASN1 && genkey)
208 noout = 1;
209
210 if (!noout) {
211 if (outformat == FORMAT_ASN1)
212 i = i2d_KeyParams_bio(out, params);
213 else
214 i = PEM_write_bio_Parameters(out, params);
215 if (!i) {
216 BIO_printf(bio_err, "Error, unable to write DSA parameters\n");
217 goto end;
218 }
219 }
220 if (genkey) {
221 EVP_PKEY_CTX_free(ctx);
222 ctx = EVP_PKEY_CTX_new_from_pkey(app_get0_libctx(), params,
223 app_get0_propq());
224 if (ctx == NULL) {
225 BIO_printf(bio_err,
226 "Error, DSA key generation context allocation failed\n");
227 goto end;
228 }
229 if (EVP_PKEY_keygen_init(ctx) <= 0) {
230 BIO_printf(bio_err,
231 "Error, unable to initialise for key generation\n");
232 goto end;
233 }
234 pkey = app_keygen(ctx, "DSA", numbits, verbose);
235 if (pkey == NULL)
236 goto end;
237 assert(private);
238 if (outformat == FORMAT_ASN1)
239 i = i2d_PrivateKey_bio(out, pkey);
240 else
241 i = PEM_write_bio_PrivateKey(out, pkey, NULL, NULL, 0, NULL, NULL);
242 }
243 ret = 0;
244 end:
245 if (ret != 0)
246 ERR_print_errors(bio_err);
247 BIO_free_all(out);
248 EVP_PKEY_CTX_free(ctx);
249 EVP_PKEY_free(pkey);
250 EVP_PKEY_free(params);
251 release_engine(e);
252 return ret;
253 }
254
