2 * Copyright 1995-2018 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
21 # include <openssl/bio.h>
22 # include <openssl/err.h>
23 # include <openssl/bn.h>
24 # include <openssl/dh.h>
25 # include <openssl/x509.h>
26 # include <openssl/pem.h>
28 # ifndef OPENSSL_NO_DSA
29 # include <openssl/dsa.h>
34 static int dh_cb(int p, int n, BN_GENCB *cb);
36 typedef enum OPTION_choice {
37 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
38 OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT,
39 OPT_ENGINE, OPT_CHECK, OPT_TEXT, OPT_NOOUT,
40 OPT_DSAPARAM, OPT_C, OPT_2, OPT_5,
44 const OPTIONS dhparam_options[] = {
45 {OPT_HELP_STR, 1, '-', "Usage: %s [flags] [numbits]\n"},
46 {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
47 {"help", OPT_HELP, '-', "Display this summary"},
48 {"in", OPT_IN, '<', "Input file"},
49 {"inform", OPT_INFORM, 'F', "Input format, DER or PEM"},
50 {"outform", OPT_OUTFORM, 'F', "Output format, DER or PEM"},
51 {"out", OPT_OUT, '>', "Output file"},
52 {"check", OPT_CHECK, '-', "Check the DH parameters"},
53 {"text", OPT_TEXT, '-', "Print a text form of the DH parameters"},
54 {"noout", OPT_NOOUT, '-', "Don't output any DH parameters"},
56 {"C", OPT_C, '-', "Print C code"},
57 {"2", OPT_2, '-', "Generate parameters using 2 as the generator value"},
58 {"5", OPT_5, '-', "Generate parameters using 5 as the generator value"},
59 # ifndef OPENSSL_NO_DSA
60 {"dsaparam", OPT_DSAPARAM, '-',
61 "Read or generate DSA parameters, convert to DH"},
63 # ifndef OPENSSL_NO_ENGINE
64 {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
69 int dhparam_main(int argc, char **argv)
71 BIO *in = NULL, *out = NULL;
73 char *infile = NULL, *outfile = NULL, *prog;
75 #ifndef OPENSSL_NO_DSA
78 int i, text = 0, C = 0, ret = 1, num = 0, g = 0;
79 int informat = FORMAT_PEM, outformat = FORMAT_PEM, check = 0, noout = 0;
82 prog = opt_init(argc, argv, dhparam_options);
83 while ((o = opt_next()) != OPT_EOF) {
88 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
91 opt_help(dhparam_options);
95 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
99 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
109 e = setup_engine(opt_arg(), 0);
118 #ifndef OPENSSL_NO_DSA
140 argc = opt_num_rest();
143 if (argv[0] != NULL && (!opt_int(argv[0], &num) || num <= 0))
149 # ifndef OPENSSL_NO_DSA
152 "generator may not be chosen for DSA parameters\n");
165 ERR_print_errors(bio_err);
169 BN_GENCB_set(cb, dh_cb, bio_err);
171 # ifndef OPENSSL_NO_DSA
173 DSA *dsa = DSA_new();
176 "Generating DSA parameters, %d bit long prime\n", num);
178 || !DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL,
182 ERR_print_errors(bio_err);
186 dh = DSA_dup_DH(dsa);
190 ERR_print_errors(bio_err);
198 "Generating DH parameters, %d bit long safe prime, generator %d\n",
200 BIO_printf(bio_err, "This is going to take a long time\n");
201 if (dh == NULL || !DH_generate_parameters_ex(dh, num, g, cb)) {
203 ERR_print_errors(bio_err);
211 in = bio_open_default(infile, 'r', informat);
215 # ifndef OPENSSL_NO_DSA
219 if (informat == FORMAT_ASN1)
220 dsa = d2i_DSAparams_bio(in, NULL);
221 else /* informat == FORMAT_PEM */
222 dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
225 BIO_printf(bio_err, "unable to load DSA parameters\n");
226 ERR_print_errors(bio_err);
230 dh = DSA_dup_DH(dsa);
233 ERR_print_errors(bio_err);
239 if (informat == FORMAT_ASN1) {
241 * We have no PEM header to determine what type of DH params it
242 * is. We'll just try both.
244 dh = d2i_DHparams_bio(in, NULL);
245 /* BIO_reset() returns 0 for success for file BIOs only!!! */
246 if (dh == NULL && BIO_reset(in) == 0)
247 dh = d2i_DHxparams_bio(in, NULL);
249 /* informat == FORMAT_PEM */
250 dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
254 BIO_printf(bio_err, "unable to load DH parameters\n");
255 ERR_print_errors(bio_err);
263 out = bio_open_default(outfile, 'w', outformat);
268 DHparams_print(out, dh);
272 if (!DH_check(dh, &i)) {
273 ERR_print_errors(bio_err);
276 if (i & DH_CHECK_P_NOT_PRIME)
277 BIO_printf(bio_err, "WARNING: p value is not prime\n");
278 if (i & DH_CHECK_P_NOT_SAFE_PRIME)
279 BIO_printf(bio_err, "WARNING: p value is not a safe prime\n");
280 if (i & DH_CHECK_Q_NOT_PRIME)
281 BIO_printf(bio_err, "WARNING: q value is not a prime\n");
282 if (i & DH_CHECK_INVALID_Q_VALUE)
283 BIO_printf(bio_err, "WARNING: q value is invalid\n");
284 if (i & DH_CHECK_INVALID_J_VALUE)
285 BIO_printf(bio_err, "WARNING: j value is invalid\n");
286 if (i & DH_UNABLE_TO_CHECK_GENERATOR)
288 "WARNING: unable to check the generator value\n");
289 if (i & DH_NOT_SUITABLE_GENERATOR)
290 BIO_printf(bio_err, "WARNING: the g value is not a generator\n");
292 BIO_printf(bio_err, "DH parameters appear to be ok.\n");
293 if (num != 0 && i != 0) {
295 * We have generated parameters but DH_check() indicates they are
296 * invalid! This should never happen!
298 BIO_printf(bio_err, "ERROR: Invalid parameters generated\n");
305 const BIGNUM *pbn, *gbn;
309 DH_get0_pqg(dh, &pbn, NULL, &gbn);
310 data = app_malloc(len, "print a BN");
311 BIO_printf(out, "#ifndef HEADER_DH_H\n"
312 "# include <openssl/dh.h>\n"
315 BIO_printf(out, "DH *get_dh%d()\n{\n", bits);
316 print_bignum_var(out, pbn, "dhp", bits, data);
317 print_bignum_var(out, gbn, "dhg", bits, data);
318 BIO_printf(out, " DH *dh = DH_new();\n"
319 " BIGNUM *dhp_bn, *dhg_bn;\n"
323 BIO_printf(out, " dhp_bn = BN_bin2bn(dhp_%d, sizeof(dhp_%d), NULL);\n",
325 BIO_printf(out, " dhg_bn = BN_bin2bn(dhg_%d, sizeof(dhg_%d), NULL);\n",
327 BIO_printf(out, " if (dhp_bn == NULL || dhg_bn == NULL\n"
328 " || !DH_set0_pqg(dh, dhp_bn, NULL, dhg_bn)) {\n"
330 " BN_free(dhp_bn);\n"
331 " BN_free(dhg_bn);\n"
334 if (DH_get_length(dh) > 0)
336 " if (!DH_set_length(dh, %ld)) {\n"
338 " }\n", DH_get_length(dh));
339 BIO_printf(out, " return dh;\n}\n");
345 DH_get0_pqg(dh, NULL, &q, NULL);
346 if (outformat == FORMAT_ASN1) {
348 i = i2d_DHxparams_bio(out, dh);
350 i = i2d_DHparams_bio(out, dh);
351 } else if (q != NULL) {
352 i = PEM_write_bio_DHxparams(out, dh);
354 i = PEM_write_bio_DHparams(out, dh);
357 BIO_printf(bio_err, "unable to write DH parameters\n");
358 ERR_print_errors(bio_err);
371 static int dh_cb(int p, int n, BN_GENCB *cb)
383 BIO_write(BN_GENCB_get_arg(cb), &c, 1);
384 (void)BIO_flush(BN_GENCB_get_arg(cb));