2 * Copyright 1995-2016 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_RAND, OPT_DSAPARAM, OPT_C, OPT_2, OPT_5
42 OPTIONS dhparam_options[] = {
43 {OPT_HELP_STR, 1, '-', "Usage: %s [flags] [numbits]\n"},
44 {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
45 {"help", OPT_HELP, '-', "Display this summary"},
46 {"in", OPT_IN, '<', "Input file"},
47 {"inform", OPT_INFORM, 'F', "Input format, DER or PEM"},
48 {"outform", OPT_OUTFORM, 'F', "Output format, DER or PEM"},
49 {"out", OPT_OUT, '>', "Output file"},
50 {"check", OPT_CHECK, '-', "Check the DH parameters"},
51 {"text", OPT_TEXT, '-', "Print a text form of the DH parameters"},
52 {"noout", OPT_NOOUT, '-', "Don't output any DH parameters"},
53 {"rand", OPT_RAND, 's',
54 "Load the file(s) into the random number generator"},
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, *inrand = NULL;
73 #ifndef OPENSSL_NO_DSA
76 int i, text = 0, C = 0, ret = 1, num = 0, g = 0;
77 int informat = FORMAT_PEM, outformat = FORMAT_PEM, check = 0, noout = 0;
80 prog = opt_init(argc, argv, dhparam_options);
81 while ((o = opt_next()) != OPT_EOF) {
86 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
89 opt_help(dhparam_options);
93 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
97 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
107 (void)setup_engine(opt_arg(), 0);
116 #ifndef OPENSSL_NO_DSA
137 argc = opt_num_rest();
140 if (argv[0] && (!opt_int(argv[0], &num) || num <= 0))
146 # ifndef OPENSSL_NO_DSA
149 "generator may not be chosen for DSA parameters\n");
162 ERR_print_errors(bio_err);
166 BN_GENCB_set(cb, dh_cb, bio_err);
167 if (!app_RAND_load_file(NULL, 1) && inrand == NULL) {
169 "warning, not much extra random data, consider using the -rand option\n");
172 BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
173 app_RAND_load_files(inrand));
175 # ifndef OPENSSL_NO_DSA
177 DSA *dsa = DSA_new();
180 "Generating DSA parameters, %d bit long prime\n", num);
182 || !DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL,
186 ERR_print_errors(bio_err);
190 dh = DSA_dup_DH(dsa);
194 ERR_print_errors(bio_err);
202 "Generating DH parameters, %d bit long safe prime, generator %d\n",
204 BIO_printf(bio_err, "This is going to take a long time\n");
205 if (dh == NULL || !DH_generate_parameters_ex(dh, num, g, cb)) {
207 ERR_print_errors(bio_err);
213 app_RAND_write_file(NULL);
216 in = bio_open_default(infile, 'r', informat);
220 # ifndef OPENSSL_NO_DSA
224 if (informat == FORMAT_ASN1)
225 dsa = d2i_DSAparams_bio(in, NULL);
226 else /* informat == FORMAT_PEM */
227 dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
230 BIO_printf(bio_err, "unable to load DSA parameters\n");
231 ERR_print_errors(bio_err);
235 dh = DSA_dup_DH(dsa);
238 ERR_print_errors(bio_err);
244 if (informat == FORMAT_ASN1)
245 dh = d2i_DHparams_bio(in, NULL);
246 else /* informat == FORMAT_PEM */
247 dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
250 BIO_printf(bio_err, "unable to load DH parameters\n");
251 ERR_print_errors(bio_err);
259 out = bio_open_default(outfile, 'w', outformat);
264 DHparams_print(out, dh);
268 if (!DH_check(dh, &i)) {
269 ERR_print_errors(bio_err);
272 if (i & DH_CHECK_P_NOT_PRIME)
273 printf("p value is not prime\n");
274 if (i & DH_CHECK_P_NOT_SAFE_PRIME)
275 printf("p value is not a safe prime\n");
276 if (i & DH_UNABLE_TO_CHECK_GENERATOR)
277 printf("unable to check the generator value\n");
278 if (i & DH_NOT_SUITABLE_GENERATOR)
279 printf("the g value is not a generator\n");
281 printf("DH parameters appear to be ok.\n");
290 DH_get0_pqg(dh, &pbn, NULL, &gbn);
291 data = app_malloc(len, "print a BN");
292 BIO_printf(out, "#ifndef HEADER_DH_H\n"
293 "# include <openssl/dh.h>\n"
296 BIO_printf(out, "DH *get_dh%d()\n{\n", bits);
297 print_bignum_var(out, pbn, "dhp", bits, data);
298 print_bignum_var(out, gbn, "dhg", bits, data);
299 BIO_printf(out, " DH *dh = DH_new();\n"
300 " BIGNUM *dhp_bn, *dhg_bn;\n"
304 BIO_printf(out, " dhp_bn = BN_bin2bn(dhp_%d, sizeof (dhp_%d), NULL);\n",
306 BIO_printf(out, " dhg_bn = BN_bin2bn(dhg_%d, sizeof (dhg_%d), NULL);\n",
308 BIO_printf(out, " if (dhp_bn == NULL || dhg_bn == NULL\n"
309 " || !DH_set0_pqg(dh, dhp_bn, NULL, dhg_bn)) {\n"
311 " BN_free(dhp_bn);\n"
312 " BN_free(dhg_bn);\n"
315 if (DH_get_length(dh) > 0)
317 " if (!DH_set_length(dh, %ld)) {\n"
319 " }\n", DH_get_length(dh));
320 BIO_printf(out, " return dh;\n}\n");
326 DH_get0_pqg(dh, NULL, &q, NULL);
327 if (outformat == FORMAT_ASN1)
328 i = i2d_DHparams_bio(out, dh);
330 i = PEM_write_bio_DHxparams(out, dh);
332 i = PEM_write_bio_DHparams(out, dh);
334 BIO_printf(bio_err, "unable to write DH parameters\n");
335 ERR_print_errors(bio_err);
347 static int dh_cb(int p, int n, BN_GENCB *cb)
359 BIO_write(BN_GENCB_get_arg(cb), &c, 1);
360 (void)BIO_flush(BN_GENCB_get_arg(cb));