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 <string.h>
15 #include <time.h>
16 #include "apps.h"
17 #include "progs.h"
18 #include <openssl/bio.h>
19 #include <openssl/err.h>
20 #include <openssl/dsa.h>
21 #include <openssl/evp.h>
22 #include <openssl/x509.h>
23 #include <openssl/pem.h>
24 #include <openssl/bn.h>
25 #include <openssl/encoder.h>
26 #include <openssl/core_names.h>
27 #include <openssl/core_dispatch.h>
28
29 #ifndef OPENSSL_NO_RC4
30 # define DEFAULT_PVK_ENCR_STRENGTH 2
31 #else
32 # define DEFAULT_PVK_ENCR_STRENGTH 0
33 #endif
34
35 typedef enum OPTION_choice {
36 OPT_COMMON,
37 OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_ENGINE,
38 /* Do not change the order here; see case statements below */
39 OPT_PVK_NONE, OPT_PVK_WEAK, OPT_PVK_STRONG,
40 OPT_NOOUT, OPT_TEXT, OPT_MODULUS, OPT_PUBIN,
41 OPT_PUBOUT, OPT_CIPHER, OPT_PASSIN, OPT_PASSOUT,
42 OPT_PROV_ENUM
43 } OPTION_CHOICE;
44
45 const OPTIONS dsa_options[] = {
46 OPT_SECTION("General"),
47 {"help", OPT_HELP, '-', "Display this summary"},
48 {"", OPT_CIPHER, '-', "Any supported cipher"},
49 #ifndef OPENSSL_NO_RC4
50 {"pvk-strong", OPT_PVK_STRONG, '-', "Enable 'Strong' PVK encoding level (default)"},
51 {"pvk-weak", OPT_PVK_WEAK, '-', "Enable 'Weak' PVK encoding level"},
52 {"pvk-none", OPT_PVK_NONE, '-', "Don't enforce PVK encoding"},
53 #endif
54 #ifndef OPENSSL_NO_ENGINE
55 {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
56 #endif
57
58 OPT_SECTION("Input"),
59 {"in", OPT_IN, 's', "Input key"},
60 {"inform", OPT_INFORM, 'f', "Input format (DER/PEM/PVK); has no effect"},
61 {"pubin", OPT_PUBIN, '-', "Expect a public key in input file"},
62 {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
63
64 OPT_SECTION("Output"),
65 {"out", OPT_OUT, '>', "Output file"},
66 {"outform", OPT_OUTFORM, 'f', "Output format, DER PEM PVK"},
67 {"noout", OPT_NOOUT, '-', "Don't print key out"},
68 {"text", OPT_TEXT, '-', "Print the key in text"},
69 {"modulus", OPT_MODULUS, '-', "Print the DSA public value"},
70 {"pubout", OPT_PUBOUT, '-', "Output public key, not private"},
71 {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
72
73 OPT_PROV_OPTIONS,
74 {NULL}
75 };
76
dsa_main(int argc,char ** argv)77 int dsa_main(int argc, char **argv)
78 {
79 BIO *out = NULL;
80 ENGINE *e = NULL;
81 EVP_PKEY *pkey = NULL;
82 EVP_CIPHER *enc = NULL;
83 char *infile = NULL, *outfile = NULL, *prog;
84 char *passin = NULL, *passout = NULL, *passinarg = NULL, *passoutarg = NULL;
85 OPTION_CHOICE o;
86 int informat = FORMAT_UNDEF, outformat = FORMAT_PEM, text = 0, noout = 0;
87 int modulus = 0, pubin = 0, pubout = 0, ret = 1;
88 int pvk_encr = DEFAULT_PVK_ENCR_STRENGTH;
89 int private = 0;
90 const char *output_type = NULL, *ciphername = NULL;
91 const char *output_structure = NULL;
92 int selection = 0;
93 OSSL_ENCODER_CTX *ectx = NULL;
94
95 opt_set_unknown_name("cipher");
96 prog = opt_init(argc, argv, dsa_options);
97 while ((o = opt_next()) != OPT_EOF) {
98 switch (o) {
99 case OPT_EOF:
100 case OPT_ERR:
101 opthelp:
102 ret = 0;
103 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
104 goto end;
105 case OPT_HELP:
106 opt_help(dsa_options);
107 ret = 0;
108 goto end;
109 case OPT_INFORM:
110 if (!opt_format(opt_arg(), OPT_FMT_ANY, &informat))
111 goto opthelp;
112 break;
113 case OPT_IN:
114 infile = opt_arg();
115 break;
116 case OPT_OUTFORM:
117 if (!opt_format(opt_arg(), OPT_FMT_ANY, &outformat))
118 goto opthelp;
119 break;
120 case OPT_OUT:
121 outfile = opt_arg();
122 break;
123 case OPT_ENGINE:
124 e = setup_engine(opt_arg(), 0);
125 break;
126 case OPT_PASSIN:
127 passinarg = opt_arg();
128 break;
129 case OPT_PASSOUT:
130 passoutarg = opt_arg();
131 break;
132 case OPT_PVK_STRONG: /* pvk_encr:= 2 */
133 case OPT_PVK_WEAK: /* pvk_encr:= 1 */
134 case OPT_PVK_NONE: /* pvk_encr:= 0 */
135 #ifndef OPENSSL_NO_RC4
136 pvk_encr = (o - OPT_PVK_NONE);
137 #endif
138 break;
139 case OPT_NOOUT:
140 noout = 1;
141 break;
142 case OPT_TEXT:
143 text = 1;
144 break;
145 case OPT_MODULUS:
146 modulus = 1;
147 break;
148 case OPT_PUBIN:
149 pubin = 1;
150 break;
151 case OPT_PUBOUT:
152 pubout = 1;
153 break;
154 case OPT_CIPHER:
155 ciphername = opt_unknown();
156 break;
157 case OPT_PROV_CASES:
158 if (!opt_provider(o))
159 goto end;
160 break;
161 }
162 }
163
164 /* No extra args. */
165 if (!opt_check_rest_arg(NULL))
166 goto opthelp;
167
168 if (!opt_cipher(ciphername, &enc))
169 goto end;
170 private = !pubin && (!pubout || text);
171
172 if (!app_passwd(passinarg, passoutarg, &passin, &passout)) {
173 BIO_printf(bio_err, "Error getting passwords\n");
174 goto end;
175 }
176
177 BIO_printf(bio_err, "read DSA key\n");
178 if (pubin)
179 pkey = load_pubkey(infile, informat, 1, passin, e, "public key");
180 else
181 pkey = load_key(infile, informat, 1, passin, e, "private key");
182
183 if (pkey == NULL) {
184 BIO_printf(bio_err, "unable to load Key\n");
185 ERR_print_errors(bio_err);
186 goto end;
187 }
188 if (!EVP_PKEY_is_a(pkey, "DSA")) {
189 BIO_printf(bio_err, "Not a DSA key\n");
190 goto end;
191 }
192
193 out = bio_open_owner(outfile, outformat, private);
194 if (out == NULL)
195 goto end;
196
197 if (text) {
198 assert(pubin || private);
199 if ((pubin && EVP_PKEY_print_public(out, pkey, 0, NULL) <= 0)
200 || (!pubin && EVP_PKEY_print_private(out, pkey, 0, NULL) <= 0)) {
201 perror(outfile);
202 ERR_print_errors(bio_err);
203 goto end;
204 }
205 }
206
207 if (modulus) {
208 BIGNUM *pub_key = NULL;
209
210 if (!EVP_PKEY_get_bn_param(pkey, "pub", &pub_key)) {
211 ERR_print_errors(bio_err);
212 goto end;
213 }
214 BIO_printf(out, "Public Key=");
215 BN_print(out, pub_key);
216 BIO_printf(out, "\n");
217 BN_free(pub_key);
218 }
219
220 if (noout) {
221 ret = 0;
222 goto end;
223 }
224 BIO_printf(bio_err, "writing DSA key\n");
225 if (outformat == FORMAT_ASN1) {
226 output_type = "DER";
227 } else if (outformat == FORMAT_PEM) {
228 output_type = "PEM";
229 } else if (outformat == FORMAT_MSBLOB) {
230 output_type = "MSBLOB";
231 } else if (outformat == FORMAT_PVK) {
232 if (pubin) {
233 BIO_printf(bio_err, "PVK form impossible with public key input\n");
234 goto end;
235 }
236 output_type = "PVK";
237 } else {
238 BIO_printf(bio_err, "bad output format specified for outfile\n");
239 goto end;
240 }
241
242 if (outformat == FORMAT_ASN1 || outformat == FORMAT_PEM) {
243 if (pubout || pubin)
244 output_structure = "SubjectPublicKeyInfo";
245 else
246 output_structure = "type-specific";
247 }
248
249 /* Select what you want in the output */
250 if (pubout || pubin) {
251 selection = OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
252 } else {
253 assert(private);
254 selection = (OSSL_KEYMGMT_SELECT_KEYPAIR
255 | OSSL_KEYMGMT_SELECT_ALL_PARAMETERS);
256 }
257
258 /* Perform the encoding */
259 ectx = OSSL_ENCODER_CTX_new_for_pkey(pkey, selection, output_type,
260 output_structure, NULL);
261 if (OSSL_ENCODER_CTX_get_num_encoders(ectx) == 0) {
262 BIO_printf(bio_err, "%s format not supported\n", output_type);
263 goto end;
264 }
265
266 /* Passphrase setup */
267 if (enc != NULL)
268 OSSL_ENCODER_CTX_set_cipher(ectx, EVP_CIPHER_get0_name(enc), NULL);
269
270 /* Default passphrase prompter */
271 if (enc != NULL || outformat == FORMAT_PVK) {
272 OSSL_ENCODER_CTX_set_passphrase_ui(ectx, get_ui_method(), NULL);
273 if (passout != NULL)
274 /* When passout given, override the passphrase prompter */
275 OSSL_ENCODER_CTX_set_passphrase(ectx,
276 (const unsigned char *)passout,
277 strlen(passout));
278 }
279
280 /* PVK requires a bit more */
281 if (outformat == FORMAT_PVK) {
282 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
283
284 params[0] = OSSL_PARAM_construct_int("encrypt-level", &pvk_encr);
285 if (!OSSL_ENCODER_CTX_set_params(ectx, params)) {
286 BIO_printf(bio_err, "invalid PVK encryption level\n");
287 goto end;
288 }
289 }
290
291 if (!OSSL_ENCODER_to_bio(ectx, out)) {
292 BIO_printf(bio_err, "unable to write key\n");
293 goto end;
294 }
295 ret = 0;
296 end:
297 if (ret != 0)
298 ERR_print_errors(bio_err);
299 OSSL_ENCODER_CTX_free(ectx);
300 BIO_free_all(out);
301 EVP_PKEY_free(pkey);
302 EVP_CIPHER_free(enc);
303 release_engine(e);
304 OPENSSL_free(passin);
305 OPENSSL_free(passout);
306 return ret;
307 }
308
