2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
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
10 /* We need to use some deprecated APIs */
11 #define OPENSSL_SUPPRESS_DEPRECATED
13 #include <openssl/opensslconf.h>
15 NON_EMPTY_TRANSLATION_UNIT
24 # include <openssl/bio.h>
25 # include <openssl/err.h>
26 # include <openssl/bn.h>
27 # include <openssl/dh.h>
28 # include <openssl/x509.h>
29 # include <openssl/pem.h>
31 # ifndef OPENSSL_NO_DSA
32 # include <openssl/dsa.h>
37 static int dh_cb(int p, int n, BN_GENCB *cb);
39 typedef enum OPTION_choice {
40 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
41 OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT,
42 OPT_ENGINE, OPT_CHECK, OPT_TEXT, OPT_NOOUT,
43 OPT_DSAPARAM, OPT_C, OPT_2, OPT_3, OPT_5,
47 const OPTIONS dhparam_options[] = {
48 {OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits]\n"},
50 OPT_SECTION("General"),
51 {"help", OPT_HELP, '-', "Display this summary"},
52 {"check", OPT_CHECK, '-', "Check the DH parameters"},
53 # ifndef OPENSSL_NO_DSA
54 {"dsaparam", OPT_DSAPARAM, '-',
55 "Read or generate DSA parameters, convert to DH"},
57 # ifndef OPENSSL_NO_ENGINE
58 {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
62 {"in", OPT_IN, '<', "Input file"},
63 {"inform", OPT_INFORM, 'F', "Input format, DER or PEM"},
65 OPT_SECTION("Output"),
66 {"out", OPT_OUT, '>', "Output file"},
67 {"outform", OPT_OUTFORM, 'F', "Output format, DER or PEM"},
68 {"text", OPT_TEXT, '-', "Print a text form of the DH parameters"},
69 {"noout", OPT_NOOUT, '-', "Don't output any DH parameters"},
70 {"C", OPT_C, '-', "Print C code"},
71 {"2", OPT_2, '-', "Generate parameters using 2 as the generator value"},
72 {"3", OPT_3, '-', "Generate parameters using 3 as the generator value"},
73 {"5", OPT_5, '-', "Generate parameters using 5 as the generator value"},
78 {"numbits", 0, 0, "Number of bits if generating parameters (optional)"},
82 int dhparam_main(int argc, char **argv)
84 BIO *in = NULL, *out = NULL;
86 char *infile = NULL, *outfile = NULL, *prog;
88 #ifndef OPENSSL_NO_DSA
91 int i, text = 0, C = 0, ret = 1, num = 0, g = 0;
92 int informat = FORMAT_PEM, outformat = FORMAT_PEM, check = 0, noout = 0;
95 prog = opt_init(argc, argv, dhparam_options);
96 while ((o = opt_next()) != OPT_EOF) {
101 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
104 opt_help(dhparam_options);
108 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
112 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
122 e = setup_engine(opt_arg(), 0);
131 #ifndef OPENSSL_NO_DSA
156 argc = opt_num_rest();
159 if (argv[0] != NULL && (!opt_int(argv[0], &num) || num <= 0))
165 # ifndef OPENSSL_NO_DSA
168 "generator may not be chosen for DSA parameters\n");
173 out = bio_open_default(outfile, 'w', outformat);
186 ERR_print_errors(bio_err);
190 BN_GENCB_set(cb, dh_cb, bio_err);
192 # ifndef OPENSSL_NO_DSA
194 DSA *dsa = DSA_new();
197 "Generating DSA parameters, %d bit long prime\n", num);
199 || !DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL,
203 ERR_print_errors(bio_err);
207 dh = DSA_dup_DH(dsa);
211 ERR_print_errors(bio_err);
219 "Generating DH parameters, %d bit long safe prime, generator %d\n",
221 BIO_printf(bio_err, "This is going to take a long time\n");
222 if (dh == NULL || !DH_generate_parameters_ex(dh, num, g, cb)) {
224 ERR_print_errors(bio_err);
232 in = bio_open_default(infile, 'r', informat);
236 # ifndef OPENSSL_NO_DSA
240 if (informat == FORMAT_ASN1)
241 dsa = d2i_DSAparams_bio(in, NULL);
242 else /* informat == FORMAT_PEM */
243 dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
246 BIO_printf(bio_err, "unable to load DSA parameters\n");
247 ERR_print_errors(bio_err);
251 dh = DSA_dup_DH(dsa);
254 ERR_print_errors(bio_err);
260 if (informat == FORMAT_ASN1) {
262 * We have no PEM header to determine what type of DH params it
263 * is. We'll just try both.
265 dh = d2i_DHparams_bio(in, NULL);
266 /* BIO_reset() returns 0 for success for file BIOs only!!! */
267 if (dh == NULL && BIO_reset(in) == 0)
268 dh = d2i_DHxparams_bio(in, NULL);
270 /* informat == FORMAT_PEM */
271 dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
275 BIO_printf(bio_err, "unable to load DH parameters\n");
276 ERR_print_errors(bio_err);
285 DHparams_print(out, dh);
289 if (!DH_check(dh, &i)) {
290 ERR_print_errors(bio_err);
293 if (i & DH_CHECK_P_NOT_PRIME)
294 BIO_printf(bio_err, "WARNING: p value is not prime\n");
295 if (i & DH_CHECK_P_NOT_SAFE_PRIME)
296 BIO_printf(bio_err, "WARNING: p value is not a safe prime\n");
297 if (i & DH_CHECK_Q_NOT_PRIME)
298 BIO_printf(bio_err, "WARNING: q value is not a prime\n");
299 if (i & DH_CHECK_INVALID_Q_VALUE)
300 BIO_printf(bio_err, "WARNING: q value is invalid\n");
301 if (i & DH_CHECK_INVALID_J_VALUE)
302 BIO_printf(bio_err, "WARNING: j value is invalid\n");
303 if (i & DH_UNABLE_TO_CHECK_GENERATOR)
305 "WARNING: unable to check the generator value\n");
306 if (i & DH_NOT_SUITABLE_GENERATOR)
307 BIO_printf(bio_err, "WARNING: the g value is not a generator\n");
309 BIO_printf(bio_err, "DH parameters appear to be ok.\n");
310 if (num != 0 && i != 0) {
312 * We have generated parameters but DH_check() indicates they are
313 * invalid! This should never happen!
315 BIO_printf(bio_err, "ERROR: Invalid parameters generated\n");
322 const BIGNUM *pbn, *gbn;
326 DH_get0_pqg(dh, &pbn, NULL, &gbn);
327 data = app_malloc(len, "print a BN");
329 BIO_printf(out, "static DH *get_dh%d(void)\n{\n", bits);
330 print_bignum_var(out, pbn, "dhp", bits, data);
331 print_bignum_var(out, gbn, "dhg", bits, data);
332 BIO_printf(out, " DH *dh = DH_new();\n"
337 BIO_printf(out, " p = BN_bin2bn(dhp_%d, sizeof(dhp_%d), NULL);\n",
339 BIO_printf(out, " g = BN_bin2bn(dhg_%d, sizeof(dhg_%d), NULL);\n",
341 BIO_printf(out, " if (p == NULL || g == NULL\n"
342 " || !DH_set0_pqg(dh, p, NULL, g)) {\n"
348 if (DH_get_length(dh) > 0)
350 " if (!DH_set_length(dh, %ld)) {\n"
353 " }\n", DH_get_length(dh));
354 BIO_printf(out, " return dh;\n}\n");
360 DH_get0_pqg(dh, NULL, &q, NULL);
361 if (outformat == FORMAT_ASN1) {
363 i = i2d_DHxparams_bio(out, dh);
365 i = i2d_DHparams_bio(out, dh);
366 } else if (q != NULL) {
367 i = PEM_write_bio_DHxparams(out, dh);
369 i = PEM_write_bio_DHparams(out, dh);
372 BIO_printf(bio_err, "unable to write DH parameters\n");
373 ERR_print_errors(bio_err);
386 static int dh_cb(int p, int n, BN_GENCB *cb)
388 static const char symbols[] = ".+*\n";
389 char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?';
391 BIO_write(BN_GENCB_get_arg(cb), &c, 1);
392 (void)BIO_flush(BN_GENCB_get_arg(cb));