2 * Copyright 1995-2020 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>
17 #include <openssl/bio.h>
18 #include <openssl/err.h>
19 #include <openssl/bn.h>
20 #include <openssl/dh.h>
21 #include <openssl/x509.h>
22 #include <openssl/pem.h>
24 #ifndef OPENSSL_NO_DSA
25 # include <openssl/dsa.h>
30 static int dh_cb(int p, int n, BN_GENCB *cb);
32 typedef enum OPTION_choice {
33 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
34 OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT,
35 OPT_ENGINE, OPT_CHECK, OPT_TEXT, OPT_NOOUT,
36 OPT_DSAPARAM, OPT_C, OPT_2, OPT_5,
40 const OPTIONS dhparam_options[] = {
41 {OPT_HELP_STR, 1, '-', "Usage: %s [flags] [numbits]\n"},
42 {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
43 {"help", OPT_HELP, '-', "Display this summary"},
44 {"in", OPT_IN, '<', "Input file"},
45 {"inform", OPT_INFORM, 'F', "Input format, DER or PEM"},
46 {"outform", OPT_OUTFORM, 'F', "Output format, DER or PEM"},
47 {"out", OPT_OUT, '>', "Output file"},
48 {"check", OPT_CHECK, '-', "Check the DH parameters"},
49 {"text", OPT_TEXT, '-', "Print a text form of the DH parameters"},
50 {"noout", OPT_NOOUT, '-', "Don't output any DH parameters"},
52 {"C", OPT_C, '-', "Print C code"},
53 {"2", OPT_2, '-', "Generate parameters using 2 as the generator value"},
54 {"5", OPT_5, '-', "Generate parameters using 5 as the generator value"},
55 #ifndef OPENSSL_NO_DSA
56 {"dsaparam", OPT_DSAPARAM, '-',
57 "Read or generate DSA parameters, convert to DH"},
59 #ifndef OPENSSL_NO_ENGINE
60 {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
65 int dhparam_main(int argc, char **argv)
67 BIO *in = NULL, *out = NULL;
69 char *infile = NULL, *outfile = NULL, *prog;
71 #ifndef OPENSSL_NO_DSA
74 int i, text = 0, C = 0, ret = 1, num = 0, g = 0;
75 int informat = FORMAT_PEM, outformat = FORMAT_PEM, check = 0, noout = 0;
78 prog = opt_init(argc, argv, dhparam_options);
79 while ((o = opt_next()) != OPT_EOF) {
84 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
87 opt_help(dhparam_options);
91 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
95 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
105 e = setup_engine(opt_arg(), 0);
114 #ifndef OPENSSL_NO_DSA
136 argc = opt_num_rest();
139 if (argv[0] != NULL && (!opt_int(argv[0], &num) || num <= 0))
145 #ifndef OPENSSL_NO_DSA
148 "generator may not be chosen for DSA parameters\n");
153 out = bio_open_default(outfile, 'w', outformat);
166 ERR_print_errors(bio_err);
170 BN_GENCB_set(cb, dh_cb, bio_err);
172 #ifndef OPENSSL_NO_DSA
174 DSA *dsa = DSA_new();
177 "Generating DSA parameters, %d bit long prime\n", num);
179 || !DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL,
183 ERR_print_errors(bio_err);
187 dh = DSA_dup_DH(dsa);
191 ERR_print_errors(bio_err);
199 "Generating DH parameters, %d bit long safe prime, generator %d\n",
201 BIO_printf(bio_err, "This is going to take a long time\n");
202 if (dh == NULL || !DH_generate_parameters_ex(dh, num, g, cb)) {
204 ERR_print_errors(bio_err);
212 in = bio_open_default(infile, 'r', informat);
216 #ifndef OPENSSL_NO_DSA
220 if (informat == FORMAT_ASN1)
221 dsa = d2i_DSAparams_bio(in, NULL);
222 else /* informat == FORMAT_PEM */
223 dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
226 BIO_printf(bio_err, "unable to load DSA parameters\n");
227 ERR_print_errors(bio_err);
231 dh = DSA_dup_DH(dsa);
234 ERR_print_errors(bio_err);
240 if (informat == FORMAT_ASN1) {
242 * We have no PEM header to determine what type of DH params it
243 * is. We'll just try both.
245 dh = d2i_DHparams_bio(in, NULL);
246 /* BIO_reset() returns 0 for success for file BIOs only!!! */
247 if (dh == NULL && BIO_reset(in) == 0)
248 dh = d2i_DHxparams_bio(in, NULL);
250 /* informat == FORMAT_PEM */
251 dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
255 BIO_printf(bio_err, "unable to load DH parameters\n");
256 ERR_print_errors(bio_err);
265 DHparams_print(out, dh);
269 if (!DH_check(dh, &i)) {
270 ERR_print_errors(bio_err);
273 if (i & DH_CHECK_P_NOT_PRIME)
274 BIO_printf(bio_err, "WARNING: p value is not prime\n");
275 if (i & DH_CHECK_P_NOT_SAFE_PRIME)
276 BIO_printf(bio_err, "WARNING: p value is not a safe prime\n");
277 if (i & DH_CHECK_Q_NOT_PRIME)
278 BIO_printf(bio_err, "WARNING: q value is not a prime\n");
279 if (i & DH_CHECK_INVALID_Q_VALUE)
280 BIO_printf(bio_err, "WARNING: q value is invalid\n");
281 if (i & DH_CHECK_INVALID_J_VALUE)
282 BIO_printf(bio_err, "WARNING: j value is invalid\n");
283 if (i & DH_UNABLE_TO_CHECK_GENERATOR)
285 "WARNING: unable to check the generator value\n");
286 if (i & DH_NOT_SUITABLE_GENERATOR)
287 BIO_printf(bio_err, "WARNING: the g value is not a generator\n");
289 BIO_printf(bio_err, "DH parameters appear to be ok.\n");
290 if (num != 0 && i != 0) {
292 * We have generated parameters but DH_check() indicates they are
293 * invalid! This should never happen!
295 BIO_printf(bio_err, "ERROR: Invalid parameters generated\n");
302 const BIGNUM *pbn, *gbn;
306 DH_get0_pqg(dh, &pbn, NULL, &gbn);
307 data = app_malloc(len, "print a BN");
309 BIO_printf(out, "static DH *get_dh%d(void)\n{\n", bits);
310 print_bignum_var(out, pbn, "dhp", bits, data);
311 print_bignum_var(out, gbn, "dhg", bits, data);
312 BIO_printf(out, " DH *dh = DH_new();\n"
317 BIO_printf(out, " p = BN_bin2bn(dhp_%d, sizeof(dhp_%d), NULL);\n",
319 BIO_printf(out, " g = BN_bin2bn(dhg_%d, sizeof(dhg_%d), NULL);\n",
321 BIO_printf(out, " if (p == NULL || g == NULL\n"
322 " || !DH_set0_pqg(dh, p, NULL, g)) {\n"
328 if (DH_get_length(dh) > 0)
330 " if (!DH_set_length(dh, %ld)) {\n"
333 " }\n", DH_get_length(dh));
334 BIO_printf(out, " return dh;\n}\n");
340 DH_get0_pqg(dh, NULL, &q, NULL);
341 if (outformat == FORMAT_ASN1) {
343 i = i2d_DHxparams_bio(out, dh);
345 i = i2d_DHparams_bio(out, dh);
346 } else if (q != NULL) {
347 i = PEM_write_bio_DHxparams(out, dh);
349 i = PEM_write_bio_DHparams(out, dh);
352 BIO_printf(bio_err, "unable to write DH parameters\n");
353 ERR_print_errors(bio_err);
366 static int dh_cb(int p, int n, BN_GENCB *cb)
368 static const char symbols[] = ".+*\n";
369 char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?';
371 BIO_write(BN_GENCB_get_arg(cb), &c, 1);
372 (void)BIO_flush(BN_GENCB_get_arg(cb));