2 * Copyright 1995-2023 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>
18 #include <openssl/bio.h>
19 #include <openssl/err.h>
20 #include <openssl/bn.h>
21 #include <openssl/dsa.h>
22 #include <openssl/dh.h>
23 #include <openssl/x509.h>
24 #include <openssl/pem.h>
25 #include <openssl/core_names.h>
26 #include <openssl/core_dispatch.h>
27 #include <openssl/param_build.h>
28 #include <openssl/encoder.h>
29 #include <openssl/decoder.h>
33 static EVP_PKEY *dsa_to_dh(EVP_PKEY *dh);
35 static int verbose = 1;
37 typedef enum OPTION_choice {
39 OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT,
40 OPT_ENGINE, OPT_CHECK, OPT_TEXT, OPT_NOOUT,
41 OPT_DSAPARAM, OPT_2, OPT_3, OPT_5, OPT_VERBOSE, OPT_QUIET,
42 OPT_R_ENUM, OPT_PROV_ENUM
45 const OPTIONS dhparam_options[] = {
46 {OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits]\n"},
48 OPT_SECTION("General"),
49 {"help", OPT_HELP, '-', "Display this summary"},
50 {"check", OPT_CHECK, '-', "Check the DH parameters"},
51 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_DEPRECATED_3_0)
52 {"dsaparam", OPT_DSAPARAM, '-',
53 "Read or generate DSA parameters, convert to DH"},
55 #ifndef OPENSSL_NO_ENGINE
56 {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
60 {"in", OPT_IN, '<', "Input file"},
61 {"inform", OPT_INFORM, 'F', "Input format, DER or PEM"},
63 OPT_SECTION("Output"),
64 {"out", OPT_OUT, '>', "Output file"},
65 {"outform", OPT_OUTFORM, 'F', "Output format, DER or PEM"},
66 {"text", OPT_TEXT, '-', "Print a text form of the DH parameters"},
67 {"noout", OPT_NOOUT, '-', "Don't output any DH parameters"},
68 {"2", OPT_2, '-', "Generate parameters using 2 as the generator value"},
69 {"3", OPT_3, '-', "Generate parameters using 3 as the generator value"},
70 {"5", OPT_5, '-', "Generate parameters using 5 as the generator value"},
71 {"verbose", OPT_VERBOSE, '-', "Verbose output"},
72 {"quiet", OPT_QUIET, '-', "Terse output"},
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;
85 EVP_PKEY *pkey = NULL, *tmppkey = NULL;
86 EVP_PKEY_CTX *ctx = NULL;
87 char *infile = NULL, *outfile = NULL, *prog;
90 int text = 0, ret = 1, num = 0, g = 0;
91 int informat = FORMAT_PEM, outformat = FORMAT_PEM, check = 0, noout = 0;
94 prog = opt_init(argc, argv, dhparam_options);
95 while ((o = opt_next()) != OPT_EOF) {
100 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
103 opt_help(dhparam_options);
107 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
111 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
121 e = setup_engine(opt_arg(), 0);
155 if (!opt_provider(o))
161 /* One optional argument, bitsize to generate. */
162 argc = opt_num_rest();
165 if (!opt_int(argv[0], &num) || num <= 0)
167 } else if (!opt_check_rest_arg(NULL)) {
170 if (!app_RAND_load())
178 "Error, generator may not be chosen for DSA parameters\n");
182 out = bio_open_default(outfile, 'w', outformat);
191 const char *alg = dsaparam ? "DSA" : "DH";
193 if (infile != NULL) {
194 BIO_printf(bio_err, "Warning, input file %s ignored\n", infile);
197 ctx = EVP_PKEY_CTX_new_from_name(app_get0_libctx(), alg, app_get0_propq());
200 "Error, %s param generation context allocation failed\n",
204 EVP_PKEY_CTX_set_app_data(ctx, bio_err);
206 EVP_PKEY_CTX_set_cb(ctx, progress_cb);
208 "Generating %s parameters, %d bit long %sprime\n",
209 alg, num, dsaparam ? "" : "safe ");
212 if (EVP_PKEY_paramgen_init(ctx) <= 0) {
214 "Error, unable to initialise %s parameters\n",
220 if (EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, num) <= 0) {
221 BIO_printf(bio_err, "Error, unable to set DSA prime length\n");
225 if (EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, num) <= 0) {
226 BIO_printf(bio_err, "Error, unable to set DH prime length\n");
229 if (EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, g) <= 0) {
230 BIO_printf(bio_err, "Error, unable to set generator\n");
235 tmppkey = app_paramgen(ctx, alg);
238 EVP_PKEY_CTX_free(ctx);
241 pkey = dsa_to_dh(tmppkey);
244 EVP_PKEY_free(tmppkey);
250 OSSL_DECODER_CTX *decoderctx = NULL;
251 const char *keytype = "DH";
254 in = bio_open_default(infile, 'r', informat);
260 * We assume we're done unless we explicitly want to retry and set
265 * We set NULL for the keytype to allow any key type. We don't know
266 * if we're going to get DH or DHX (or DSA in the event of dsaparam).
267 * We check that we got one of those key types afterwards.
270 = OSSL_DECODER_CTX_new_for_pkey(&tmppkey,
271 (informat == FORMAT_ASN1)
274 (informat == FORMAT_ASN1)
276 OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
279 if (decoderctx != NULL
280 && !OSSL_DECODER_from_bio(decoderctx, in)
281 && informat == FORMAT_ASN1
282 && strcmp(keytype, "DH") == 0) {
284 * When reading DER we explicitly state the expected keytype
285 * because, unlike PEM, there is no header to declare what
286 * the contents of the DER file are. The decoders just try
287 * and guess. Unfortunately with DHX key types they may guess
288 * wrong and think we have a DSA keytype. Therefore, we try
289 * both DH and DHX sequentially.
293 * BIO_reset() returns 0 for success for file BIOs only!!!
294 * This won't work for stdin (and never has done)
296 if (BIO_reset(in) == 0)
299 OSSL_DECODER_CTX_free(decoderctx);
301 if (tmppkey == NULL) {
302 BIO_printf(bio_err, "Error, unable to load parameters\n");
307 if (!EVP_PKEY_is_a(tmppkey, "DSA")) {
308 BIO_printf(bio_err, "Error, unable to load DSA parameters\n");
311 pkey = dsa_to_dh(tmppkey);
315 if (!EVP_PKEY_is_a(tmppkey, "DH")
316 && !EVP_PKEY_is_a(tmppkey, "DHX")) {
317 BIO_printf(bio_err, "Error, unable to load DH parameters\n");
326 EVP_PKEY_print_params(out, pkey, 4, NULL);
329 ctx = EVP_PKEY_CTX_new_from_pkey(app_get0_libctx(), pkey, app_get0_propq());
331 BIO_printf(bio_err, "Error, failed to check DH parameters\n");
334 if (EVP_PKEY_param_check(ctx) <= 0) {
335 BIO_printf(bio_err, "Error, invalid parameters generated\n");
338 BIO_printf(bio_err, "DH parameters appear to be ok.\n");
342 OSSL_ENCODER_CTX *ectx =
343 OSSL_ENCODER_CTX_new_for_pkey(pkey,
344 OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
345 outformat == FORMAT_ASN1
349 if (ectx == NULL || !OSSL_ENCODER_to_bio(ectx, out)) {
350 OSSL_ENCODER_CTX_free(ectx);
351 BIO_printf(bio_err, "Error, unable to write DH parameters\n");
354 OSSL_ENCODER_CTX_free(ectx);
359 ERR_print_errors(bio_err);
363 EVP_PKEY_free(tmppkey);
364 EVP_PKEY_CTX_free(ctx);
370 * Historically we had the low-level call DSA_dup_DH() to do this.
371 * That is now deprecated with no replacement. Since we still need to do this
372 * for backwards compatibility reasons, we do it "manually".
374 static EVP_PKEY *dsa_to_dh(EVP_PKEY *dh)
376 OSSL_PARAM_BLD *tmpl = NULL;
377 OSSL_PARAM *params = NULL;
378 BIGNUM *bn_p = NULL, *bn_q = NULL, *bn_g = NULL;
379 EVP_PKEY_CTX *ctx = NULL;
380 EVP_PKEY *pkey = NULL;
382 if (!EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_P, &bn_p)
383 || !EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_Q, &bn_q)
384 || !EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_G, &bn_g)) {
385 BIO_printf(bio_err, "Error, failed to set DH parameters\n");
389 if ((tmpl = OSSL_PARAM_BLD_new()) == NULL
390 || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P,
392 || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q,
394 || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G,
396 || (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) {
397 BIO_printf(bio_err, "Error, failed to set DH parameters\n");
401 ctx = EVP_PKEY_CTX_new_from_name(app_get0_libctx(), "DHX", app_get0_propq());
403 || EVP_PKEY_fromdata_init(ctx) <= 0
404 || EVP_PKEY_fromdata(ctx, &pkey, EVP_PKEY_KEY_PARAMETERS, params) <= 0) {
405 BIO_printf(bio_err, "Error, failed to set DH parameters\n");
410 EVP_PKEY_CTX_free(ctx);
411 OSSL_PARAM_free(params);
412 OSSL_PARAM_BLD_free(tmpl);