2 * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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
10 #include <openssl/opensslconf.h>
12 NON_EMPTY_TRANSLATION_UNIT
20 # include <openssl/bio.h>
21 # include <openssl/err.h>
22 # include <openssl/bn.h>
23 # include <openssl/dh.h>
24 # include <openssl/x509.h>
25 # include <openssl/pem.h>
27 # ifndef OPENSSL_NO_DSA
28 # include <openssl/dsa.h>
33 static int dh_cb(int p
, int n
, BN_GENCB
*cb
);
35 typedef enum OPTION_choice
{
36 OPT_ERR
= -1, OPT_EOF
= 0, OPT_HELP
,
37 OPT_INFORM
, OPT_OUTFORM
, OPT_IN
, OPT_OUT
,
38 OPT_ENGINE
, OPT_CHECK
, OPT_TEXT
, OPT_NOOUT
,
39 OPT_DSAPARAM
, OPT_C
, OPT_2
, OPT_5
,
43 const OPTIONS dhparam_options
[] = {
44 {OPT_HELP_STR
, 1, '-', "Usage: %s [flags] [numbits]\n"},
45 {OPT_HELP_STR
, 1, '-', "Valid options are:\n"},
46 {"help", OPT_HELP
, '-', "Display this summary"},
47 {"in", OPT_IN
, '<', "Input file"},
48 {"inform", OPT_INFORM
, 'F', "Input format, DER or PEM"},
49 {"outform", OPT_OUTFORM
, 'F', "Output format, DER or PEM"},
50 {"out", OPT_OUT
, '>', "Output file"},
51 {"check", OPT_CHECK
, '-', "Check the DH parameters"},
52 {"text", OPT_TEXT
, '-', "Print a text form of the DH parameters"},
53 {"noout", OPT_NOOUT
, '-', "Don't output any DH parameters"},
55 {"C", OPT_C
, '-', "Print C code"},
56 {"2", OPT_2
, '-', "Generate parameters using 2 as the generator value"},
57 {"5", OPT_5
, '-', "Generate parameters using 5 as the generator value"},
58 # ifndef OPENSSL_NO_DSA
59 {"dsaparam", OPT_DSAPARAM
, '-',
60 "Read or generate DSA parameters, convert to DH"},
62 # ifndef OPENSSL_NO_ENGINE
63 {"engine", OPT_ENGINE
, 's', "Use engine e, possibly a hardware device"},
68 int dhparam_main(int argc
, char **argv
)
70 BIO
*in
= NULL
, *out
= NULL
;
72 char *infile
= NULL
, *outfile
= NULL
, *prog
;
74 #ifndef OPENSSL_NO_DSA
77 int i
, text
= 0, C
= 0, ret
= 1, num
= 0, g
= 0;
78 int informat
= FORMAT_PEM
, outformat
= FORMAT_PEM
, check
= 0, noout
= 0;
81 prog
= opt_init(argc
, argv
, dhparam_options
);
82 while ((o
= opt_next()) != OPT_EOF
) {
87 BIO_printf(bio_err
, "%s: Use -help for summary.\n", prog
);
90 opt_help(dhparam_options
);
94 if (!opt_format(opt_arg(), OPT_FMT_PEMDER
, &informat
))
98 if (!opt_format(opt_arg(), OPT_FMT_PEMDER
, &outformat
))
108 e
= setup_engine(opt_arg(), 0);
117 #ifndef OPENSSL_NO_DSA
139 argc
= opt_num_rest();
142 if (argv
[0] != NULL
&& (!opt_int(argv
[0], &num
) || num
<= 0))
148 # ifndef OPENSSL_NO_DSA
151 "generator may not be chosen for DSA parameters\n");
164 ERR_print_errors(bio_err
);
168 BN_GENCB_set(cb
, dh_cb
, bio_err
);
170 # ifndef OPENSSL_NO_DSA
172 DSA
*dsa
= DSA_new();
175 "Generating DSA parameters, %d bit long prime\n", num
);
177 || !DSA_generate_parameters_ex(dsa
, num
, NULL
, 0, NULL
, NULL
,
181 ERR_print_errors(bio_err
);
185 dh
= DSA_dup_DH(dsa
);
189 ERR_print_errors(bio_err
);
197 "Generating DH parameters, %d bit long safe prime, generator %d\n",
199 BIO_printf(bio_err
, "This is going to take a long time\n");
200 if (dh
== NULL
|| !DH_generate_parameters_ex(dh
, num
, g
, cb
)) {
202 ERR_print_errors(bio_err
);
210 in
= bio_open_default(infile
, 'r', informat
);
214 # ifndef OPENSSL_NO_DSA
218 if (informat
== FORMAT_ASN1
)
219 dsa
= d2i_DSAparams_bio(in
, NULL
);
220 else /* informat == FORMAT_PEM */
221 dsa
= PEM_read_bio_DSAparams(in
, NULL
, NULL
, NULL
);
224 BIO_printf(bio_err
, "unable to load DSA parameters\n");
225 ERR_print_errors(bio_err
);
229 dh
= DSA_dup_DH(dsa
);
232 ERR_print_errors(bio_err
);
238 if (informat
== FORMAT_ASN1
) {
240 * We have no PEM header to determine what type of DH params it
241 * is. We'll just try both.
243 dh
= d2i_DHparams_bio(in
, NULL
);
244 /* BIO_reset() returns 0 for success for file BIOs only!!! */
245 if (dh
== NULL
&& BIO_reset(in
) == 0)
246 dh
= d2i_DHxparams_bio(in
, NULL
);
248 /* informat == FORMAT_PEM */
249 dh
= PEM_read_bio_DHparams(in
, NULL
, NULL
, NULL
);
253 BIO_printf(bio_err
, "unable to load DH parameters\n");
254 ERR_print_errors(bio_err
);
262 out
= bio_open_default(outfile
, 'w', outformat
);
267 DHparams_print(out
, dh
);
271 if (!DH_check(dh
, &i
)) {
272 ERR_print_errors(bio_err
);
275 if (i
& DH_CHECK_P_NOT_PRIME
)
276 BIO_printf(bio_err
, "WARNING: p value is not prime\n");
277 if (i
& DH_CHECK_P_NOT_SAFE_PRIME
)
278 BIO_printf(bio_err
, "WARNING: p value is not a safe prime\n");
279 if (i
& DH_CHECK_Q_NOT_PRIME
)
280 BIO_printf(bio_err
, "WARNING: q value is not a prime\n");
281 if (i
& DH_CHECK_INVALID_Q_VALUE
)
282 BIO_printf(bio_err
, "WARNING: q value is invalid\n");
283 if (i
& DH_CHECK_INVALID_J_VALUE
)
284 BIO_printf(bio_err
, "WARNING: j value is invalid\n");
285 if (i
& DH_UNABLE_TO_CHECK_GENERATOR
)
287 "WARNING: unable to check the generator value\n");
288 if (i
& DH_NOT_SUITABLE_GENERATOR
)
289 BIO_printf(bio_err
, "WARNING: the g value is not a generator\n");
291 BIO_printf(bio_err
, "DH parameters appear to be ok.\n");
292 if (num
!= 0 && i
!= 0) {
294 * We have generated parameters but DH_check() indicates they are
295 * invalid! This should never happen!
297 BIO_printf(bio_err
, "ERROR: Invalid parameters generated\n");
304 const BIGNUM
*pbn
, *gbn
;
308 DH_get0_pqg(dh
, &pbn
, NULL
, &gbn
);
309 data
= app_malloc(len
, "print a BN");
310 BIO_printf(out
, "#ifndef HEADER_DH_H\n"
311 "# include <openssl/dh.h>\n"
314 BIO_printf(out
, "DH *get_dh%d()\n{\n", bits
);
315 print_bignum_var(out
, pbn
, "dhp", bits
, data
);
316 print_bignum_var(out
, gbn
, "dhg", bits
, data
);
317 BIO_printf(out
, " DH *dh = DH_new();\n"
318 " BIGNUM *dhp_bn, *dhg_bn;\n"
322 BIO_printf(out
, " dhp_bn = BN_bin2bn(dhp_%d, sizeof (dhp_%d), NULL);\n",
324 BIO_printf(out
, " dhg_bn = BN_bin2bn(dhg_%d, sizeof (dhg_%d), NULL);\n",
326 BIO_printf(out
, " if (dhp_bn == NULL || dhg_bn == NULL\n"
327 " || !DH_set0_pqg(dh, dhp_bn, NULL, dhg_bn)) {\n"
329 " BN_free(dhp_bn);\n"
330 " BN_free(dhg_bn);\n"
333 if (DH_get_length(dh
) > 0)
335 " if (!DH_set_length(dh, %ld)) {\n"
337 " }\n", DH_get_length(dh
));
338 BIO_printf(out
, " return dh;\n}\n");
344 DH_get0_pqg(dh
, NULL
, &q
, NULL
);
345 if (outformat
== FORMAT_ASN1
) {
347 i
= i2d_DHxparams_bio(out
, dh
);
349 i
= i2d_DHparams_bio(out
, dh
);
350 } else if (q
!= NULL
) {
351 i
= PEM_write_bio_DHxparams(out
, dh
);
353 i
= PEM_write_bio_DHparams(out
, dh
);
356 BIO_printf(bio_err
, "unable to write DH parameters\n");
357 ERR_print_errors(bio_err
);
370 static int dh_cb(int p
, int n
, BN_GENCB
*cb
)
382 BIO_write(BN_GENCB_get_arg(cb
), &c
, 1);
383 (void)BIO_flush(BN_GENCB_get_arg(cb
));