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 #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_3, 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 {"3", OPT_3, '-', "Generate parameters using 3 as the generator value"},
59 {"5", OPT_5, '-', "Generate parameters using 5 as the generator value"},
60 # ifndef OPENSSL_NO_DSA
61 {"dsaparam", OPT_DSAPARAM, '-',
62 "Read or generate DSA parameters, convert to DH"},
64 # ifndef OPENSSL_NO_ENGINE
65 {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
70 int dhparam_main(int argc, char **argv)
72 BIO *in = NULL, *out = NULL;
74 char *infile = NULL, *outfile = NULL, *prog;
76 #ifndef OPENSSL_NO_DSA
79 int i, text = 0, C = 0, ret = 1, num = 0, g = 0;
80 int informat = FORMAT_PEM, outformat = FORMAT_PEM, check = 0, noout = 0;
83 prog = opt_init(argc, argv, dhparam_options);
84 while ((o = opt_next()) != OPT_EOF) {
89 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
92 opt_help(dhparam_options);
96 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
100 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
110 e = setup_engine(opt_arg(), 0);
119 #ifndef OPENSSL_NO_DSA
144 argc = opt_num_rest();
147 if (argv[0] != NULL && (!opt_int(argv[0], &num) || num <= 0))
153 # ifndef OPENSSL_NO_DSA
156 "generator may not be chosen for DSA parameters\n");
161 out = bio_open_default(outfile, 'w', outformat);
174 ERR_print_errors(bio_err);
178 BN_GENCB_set(cb, dh_cb, bio_err);
180 # ifndef OPENSSL_NO_DSA
182 DSA *dsa = DSA_new();
185 "Generating DSA parameters, %d bit long prime\n", num);
187 || !DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL,
191 ERR_print_errors(bio_err);
195 dh = DSA_dup_DH(dsa);
199 ERR_print_errors(bio_err);
207 "Generating DH parameters, %d bit long safe prime, generator %d\n",
209 BIO_printf(bio_err, "This is going to take a long time\n");
210 if (dh == NULL || !DH_generate_parameters_ex(dh, num, g, cb)) {
212 ERR_print_errors(bio_err);
220 in = bio_open_default(infile, 'r', informat);
224 # ifndef OPENSSL_NO_DSA
228 if (informat == FORMAT_ASN1)
229 dsa = d2i_DSAparams_bio(in, NULL);
230 else /* informat == FORMAT_PEM */
231 dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
234 BIO_printf(bio_err, "unable to load DSA parameters\n");
235 ERR_print_errors(bio_err);
239 dh = DSA_dup_DH(dsa);
242 ERR_print_errors(bio_err);
248 if (informat == FORMAT_ASN1) {
250 * We have no PEM header to determine what type of DH params it
251 * is. We'll just try both.
253 dh = d2i_DHparams_bio(in, NULL);
254 /* BIO_reset() returns 0 for success for file BIOs only!!! */
255 if (dh == NULL && BIO_reset(in) == 0)
256 dh = d2i_DHxparams_bio(in, NULL);
258 /* informat == FORMAT_PEM */
259 dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
263 BIO_printf(bio_err, "unable to load DH parameters\n");
264 ERR_print_errors(bio_err);
273 DHparams_print(out, dh);
277 if (!DH_check(dh, &i)) {
278 ERR_print_errors(bio_err);
281 if (i & DH_CHECK_P_NOT_PRIME)
282 BIO_printf(bio_err, "WARNING: p value is not prime\n");
283 if (i & DH_CHECK_P_NOT_SAFE_PRIME)
284 BIO_printf(bio_err, "WARNING: p value is not a safe prime\n");
285 if (i & DH_CHECK_Q_NOT_PRIME)
286 BIO_printf(bio_err, "WARNING: q value is not a prime\n");
287 if (i & DH_CHECK_INVALID_Q_VALUE)
288 BIO_printf(bio_err, "WARNING: q value is invalid\n");
289 if (i & DH_CHECK_INVALID_J_VALUE)
290 BIO_printf(bio_err, "WARNING: j value is invalid\n");
291 if (i & DH_UNABLE_TO_CHECK_GENERATOR)
293 "WARNING: unable to check the generator value\n");
294 if (i & DH_NOT_SUITABLE_GENERATOR)
295 BIO_printf(bio_err, "WARNING: the g value is not a generator\n");
297 BIO_printf(bio_err, "DH parameters appear to be ok.\n");
298 if (num != 0 && i != 0) {
300 * We have generated parameters but DH_check() indicates they are
301 * invalid! This should never happen!
303 BIO_printf(bio_err, "ERROR: Invalid parameters generated\n");
310 const BIGNUM *pbn, *gbn;
314 DH_get0_pqg(dh, &pbn, NULL, &gbn);
315 data = app_malloc(len, "print a BN");
317 BIO_printf(out, "static DH *get_dh%d(void)\n{\n", bits);
318 print_bignum_var(out, pbn, "dhp", bits, data);
319 print_bignum_var(out, gbn, "dhg", bits, data);
320 BIO_printf(out, " DH *dh = DH_new();\n"
325 BIO_printf(out, " p = BN_bin2bn(dhp_%d, sizeof(dhp_%d), NULL);\n",
327 BIO_printf(out, " g = BN_bin2bn(dhg_%d, sizeof(dhg_%d), NULL);\n",
329 BIO_printf(out, " if (p == NULL || g == NULL\n"
330 " || !DH_set0_pqg(dh, p, NULL, g)) {\n"
336 if (DH_get_length(dh) > 0)
338 " if (!DH_set_length(dh, %ld)) {\n"
341 " }\n", DH_get_length(dh));
342 BIO_printf(out, " return dh;\n}\n");
348 DH_get0_pqg(dh, NULL, &q, NULL);
349 if (outformat == FORMAT_ASN1) {
351 i = i2d_DHxparams_bio(out, dh);
353 i = i2d_DHparams_bio(out, dh);
354 } else if (q != NULL) {
355 i = PEM_write_bio_DHxparams(out, dh);
357 i = PEM_write_bio_DHparams(out, dh);
360 BIO_printf(bio_err, "unable to write DH parameters\n");
361 ERR_print_errors(bio_err);
374 static int dh_cb(int p, int n, BN_GENCB *cb)
376 static const char symbols[] = ".+*\n";
377 char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?';
379 BIO_write(BN_GENCB_get_arg(cb), &c, 1);
380 (void)BIO_flush(BN_GENCB_get_arg(cb));