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));