1 /*
2 * Copyright 1995-2021 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 prog = opt_init(argc, argv, dsa_options);
96 while ((o = opt_next()) != OPT_EOF) {
97 switch (o) {
98 case OPT_EOF:
99 case OPT_ERR:
100 opthelp:
101 ret = 0;
102 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
103 goto end;
104 case OPT_HELP:
105 opt_help(dsa_options);
106 ret = 0;
107 goto end;
108 case OPT_INFORM:
109 if (!opt_format(opt_arg(), OPT_FMT_ANY, &informat))
110 goto opthelp;
111 break;
112 case OPT_IN:
113 infile = opt_arg();
114 break;
115 case OPT_OUTFORM:
116 if (!opt_format(opt_arg(), OPT_FMT_ANY, &outformat))
117 goto opthelp;
118 break;
119 case OPT_OUT:
120 outfile = opt_arg();
121 break;
122 case OPT_ENGINE:
123 e = setup_engine(opt_arg(), 0);
124 break;
125 case OPT_PASSIN:
126 passinarg = opt_arg();
127 break;
128 case OPT_PASSOUT:
129 passoutarg = opt_arg();
130 break;
131 case OPT_PVK_STRONG: /* pvk_encr:= 2 */
132 case OPT_PVK_WEAK: /* pvk_encr:= 1 */
133 case OPT_PVK_NONE: /* pvk_encr:= 0 */
134 #ifndef OPENSSL_NO_RC4
135 pvk_encr = (o - OPT_PVK_NONE);
136 #endif
137 break;
138 case OPT_NOOUT:
139 noout = 1;
140 break;
141 case OPT_TEXT:
142 text = 1;
143 break;
144 case OPT_MODULUS:
145 modulus = 1;
146 break;
147 case OPT_PUBIN:
148 pubin = 1;
149 break;
150 case OPT_PUBOUT:
151 pubout = 1;
152 break;
153 case OPT_CIPHER:
154 ciphername = opt_unknown();
155 break;
156 case OPT_PROV_CASES:
157 if (!opt_provider(o))
158 goto end;
159 break;
160 }
161 }
162
163 /* No extra args. */
164 argc = opt_num_rest();
165 if (argc != 0)
166 goto opthelp;
167
168 if (ciphername != NULL) {
169 if (!opt_cipher(ciphername, &enc))
170 goto end;
171 }
172 private = pubin || pubout ? 0 : 1;
173 if (text && !pubin)
174 private = 1;
175
176 if (!app_passwd(passinarg, passoutarg, &passin, &passout)) {
177 BIO_printf(bio_err, "Error getting passwords\n");
178 goto end;
179 }
180
181 BIO_printf(bio_err, "read DSA key\n");
182 if (pubin)
183 pkey = load_pubkey(infile, informat, 1, passin, e, "public key");
184 else
185 pkey = load_key(infile, informat, 1, passin, e, "private key");
186
187 if (pkey == NULL) {
188 BIO_printf(bio_err, "unable to load Key\n");
189 ERR_print_errors(bio_err);
190 goto end;
191 }
192 if (!EVP_PKEY_is_a(pkey, "DSA")) {
193 BIO_printf(bio_err, "Not a DSA key\n");
194 goto end;
195 }
196
197 out = bio_open_owner(outfile, outformat, private);
198 if (out == NULL)
199 goto end;
200
201 if (text) {
202 assert(pubin || private);
203 if ((pubin && EVP_PKEY_print_public(out, pkey, 0, NULL) <= 0)
204 || (!pubin && EVP_PKEY_print_private(out, pkey, 0, NULL) <= 0)) {
205 perror(outfile);
206 ERR_print_errors(bio_err);
207 goto end;
208 }
209 }
210
211 if (modulus) {
212 BIGNUM *pub_key = NULL;
213
214 if (!EVP_PKEY_get_bn_param(pkey, "pub", &pub_key)) {
215 ERR_print_errors(bio_err);
216 goto end;
217 }
218 BIO_printf(out, "Public Key=");
219 BN_print(out, pub_key);
220 BIO_printf(out, "\n");
221 BN_free(pub_key);
222 }
223
224 if (noout) {
225 ret = 0;
226 goto end;
227 }
228 BIO_printf(bio_err, "writing DSA key\n");
229 if (outformat == FORMAT_ASN1) {
230 output_type = "DER";
231 } else if (outformat == FORMAT_PEM) {
232 output_type = "PEM";
233 } else if (outformat == FORMAT_MSBLOB) {
234 output_type = "MSBLOB";
235 } else if (outformat == FORMAT_PVK) {
236 if (pubin) {
237 BIO_printf(bio_err, "PVK form impossible with public key input\n");
238 goto end;
239 }
240 output_type = "PVK";
241 } else {
242 BIO_printf(bio_err, "bad output format specified for outfile\n");
243 goto end;
244 }
245
246 if (outformat == FORMAT_ASN1 || outformat == FORMAT_PEM) {
247 if (pubout || pubin)
248 output_structure = "SubjectPublicKeyInfo";
249 else
250 output_structure = "type-specific";
251 }
252
253 /* Select what you want in the output */
254 if (pubout || pubin) {
255 selection = OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
256 } else {
257 assert(private);
258 selection = (OSSL_KEYMGMT_SELECT_KEYPAIR
259 | OSSL_KEYMGMT_SELECT_ALL_PARAMETERS);
260 }
261
262 /* Perform the encoding */
263 ectx = OSSL_ENCODER_CTX_new_for_pkey(pkey, selection, output_type,
264 output_structure, NULL);
265 if (OSSL_ENCODER_CTX_get_num_encoders(ectx) == 0) {
266 BIO_printf(bio_err, "%s format not supported\n", output_type);
267 goto end;
268 }
269
270 /* Passphrase setup */
271 if (enc != NULL)
272 OSSL_ENCODER_CTX_set_cipher(ectx, EVP_CIPHER_get0_name(enc), NULL);
273
274 /* Default passphrase prompter */
275 if (enc != NULL || outformat == FORMAT_PVK) {
276 OSSL_ENCODER_CTX_set_passphrase_ui(ectx, get_ui_method(), NULL);
277 if (passout != NULL)
278 /* When passout given, override the passphrase prompter */
279 OSSL_ENCODER_CTX_set_passphrase(ectx,
280 (const unsigned char *)passout,
281 strlen(passout));
282 }
283
284 /* PVK requires a bit more */
285 if (outformat == FORMAT_PVK) {
286 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
287
288 params[0] = OSSL_PARAM_construct_int("encrypt-level", &pvk_encr);
289 if (!OSSL_ENCODER_CTX_set_params(ectx, params)) {
290 BIO_printf(bio_err, "invalid PVK encryption level\n");
291 goto end;
292 }
293 }
294
295 if (!OSSL_ENCODER_to_bio(ectx, out)) {
296 BIO_printf(bio_err, "unable to write key\n");
297 goto end;
298 }
299 ret = 0;
300 end:
301 if (ret != 0)
302 ERR_print_errors(bio_err);
303 OSSL_ENCODER_CTX_free(ectx);
304 BIO_free_all(out);
305 EVP_PKEY_free(pkey);
306 EVP_CIPHER_free(enc);
307 release_engine(e);
308 OPENSSL_free(passin);
309 OPENSSL_free(passout);
310 return ret;
311 }
312