[thirdparty/openssl.git] / apps / dhparam.c

/*
 * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <openssl/opensslconf.h>

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include "apps.h"
#include "progs.h"
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/bn.h>
#include <openssl/dsa.h>
#include <openssl/dh.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/core_names.h>
#include <openssl/core_dispatch.h>
#include <openssl/param_build.h>
#include <openssl/encoder.h>
#include <openssl/decoder.h>

#define DEFBITS 2048

static EVP_PKEY *dsa_to_dh(EVP_PKEY *dh);

static int verbose = 1;

typedef enum OPTION_choice {
    OPT_COMMON,
    OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT,
    OPT_ENGINE, OPT_CHECK, OPT_TEXT, OPT_NOOUT,
    OPT_DSAPARAM, OPT_2, OPT_3, OPT_5, OPT_VERBOSE, OPT_QUIET,
    OPT_R_ENUM, OPT_PROV_ENUM
} OPTION_CHOICE;

const OPTIONS dhparam_options[] = {
    {OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits]\n"},

    OPT_SECTION("General"),
    {"help", OPT_HELP, '-', "Display this summary"},
    {"check", OPT_CHECK, '-', "Check the DH parameters"},
#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_DEPRECATED_3_0)
    {"dsaparam", OPT_DSAPARAM, '-',
     "Read or generate DSA parameters, convert to DH"},
#endif
#ifndef OPENSSL_NO_ENGINE
    {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
#endif

    OPT_SECTION("Input"),
    {"in", OPT_IN, '<', "Input file"},
    {"inform", OPT_INFORM, 'F', "Input format, DER or PEM"},

    OPT_SECTION("Output"),
    {"out", OPT_OUT, '>', "Output file"},
    {"outform", OPT_OUTFORM, 'F', "Output format, DER or PEM"},
    {"text", OPT_TEXT, '-', "Print a text form of the DH parameters"},
    {"noout", OPT_NOOUT, '-', "Don't output any DH parameters"},
    {"2", OPT_2, '-', "Generate parameters using 2 as the generator value"},
    {"3", OPT_3, '-', "Generate parameters using 3 as the generator value"},
    {"5", OPT_5, '-', "Generate parameters using 5 as the generator value"},
    {"verbose", OPT_VERBOSE, '-', "Verbose output"},
    {"quiet", OPT_QUIET, '-', "Terse output"},

    OPT_R_OPTIONS,
    OPT_PROV_OPTIONS,

    OPT_PARAMETERS(),
    {"numbits", 0, 0, "Number of bits if generating parameters (optional)"},
    {NULL}
};

int dhparam_main(int argc, char **argv)
{
    BIO *in = NULL, *out = NULL;
    EVP_PKEY *pkey = NULL, *tmppkey = NULL;
    EVP_PKEY_CTX *ctx = NULL;
    char *infile = NULL, *outfile = NULL, *prog;
    ENGINE *e = NULL;
    int dsaparam = 0;
    int text = 0, ret = 1, num = 0, g = 0;
    int informat = FORMAT_PEM, outformat = FORMAT_PEM, check = 0, noout = 0;
    OPTION_CHOICE o;

    prog = opt_init(argc, argv, dhparam_options);
    while ((o = opt_next()) != OPT_EOF) {
        switch (o) {
        case OPT_EOF:
        case OPT_ERR:
 opthelp:
            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
            goto end;
        case OPT_HELP:
            opt_help(dhparam_options);
            ret = 0;
            goto end;
        case OPT_INFORM:
            if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
                goto opthelp;
            break;
        case OPT_OUTFORM:
            if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
                goto opthelp;
            break;
        case OPT_IN:
            infile = opt_arg();
            break;
        case OPT_OUT:
            outfile = opt_arg();
            break;
        case OPT_ENGINE:
            e = setup_engine(opt_arg(), 0);
            break;
        case OPT_CHECK:
            check = 1;
            break;
        case OPT_TEXT:
            text = 1;
            break;
        case OPT_DSAPARAM:
            dsaparam = 1;
            break;
        case OPT_2:
            g = 2;
            break;
        case OPT_3:
            g = 3;
            break;
        case OPT_5:
            g = 5;
            break;
        case OPT_NOOUT:
            noout = 1;
            break;
        case OPT_VERBOSE:
            verbose = 1;
            break;
        case OPT_QUIET:
            verbose = 0;
            break;
        case OPT_R_CASES:
            if (!opt_rand(o))
                goto end;
            break;
        case OPT_PROV_CASES:
            if (!opt_provider(o))
                goto end;
            break;
        }
    }

    /* One optional argument, bitsize to generate. */
    argc = opt_num_rest();
    argv = opt_rest();
    if (argc == 1) {
        if (!opt_int(argv[0], &num) || num <= 0)
            goto opthelp;
    } else if (!opt_check_rest_arg(NULL)) {
        goto opthelp;
    }
    if (!app_RAND_load())
        goto end;

    if (g && !num)
        num = DEFBITS;

    if (dsaparam && g) {
        BIO_printf(bio_err,
                   "Error, generator may not be chosen for DSA parameters\n");
        goto end;
    }

    /* DH parameters */
    if (num && !g)
        g = 2;

    if (num) {
        const char *alg = dsaparam ? "DSA" : "DH";

        if (infile != NULL) {
            BIO_printf(bio_err, "Warning, input file %s ignored\n", infile);
        }

        ctx = EVP_PKEY_CTX_new_from_name(app_get0_libctx(), alg, app_get0_propq());
        if (ctx == NULL) {
            BIO_printf(bio_err,
                        "Error, %s param generation context allocation failed\n",
                        alg);
            goto end;
        }
        EVP_PKEY_CTX_set_app_data(ctx, bio_err);
        if (verbose) {
            EVP_PKEY_CTX_set_cb(ctx, progress_cb);
            BIO_printf(bio_err,
                        "Generating %s parameters, %d bit long %sprime\n",
                        alg, num, dsaparam ? "" : "safe ");
        }

        if (EVP_PKEY_paramgen_init(ctx) <= 0) {
            BIO_printf(bio_err,
                        "Error, unable to initialise %s parameters\n",
                        alg);
            goto end;
        }

        if (dsaparam) {
            if (EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, num) <= 0) {
                BIO_printf(bio_err, "Error, unable to set DSA prime length\n");
                goto end;
            }
        } else {
            if (EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, num) <= 0) {
                BIO_printf(bio_err, "Error, unable to set DH prime length\n");
                goto end;
            }
            if (EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, g) <= 0) {
                BIO_printf(bio_err, "Error, unable to set generator\n");
                goto end;
            }
        }

        tmppkey = app_paramgen(ctx, alg);
        if (tmppkey == NULL)
            goto end;
        EVP_PKEY_CTX_free(ctx);
        ctx = NULL;
        if (dsaparam) {
            pkey = dsa_to_dh(tmppkey);
            if (pkey == NULL)
                goto end;
            EVP_PKEY_free(tmppkey);
        } else {
            pkey = tmppkey;
        }
        tmppkey = NULL;
    } else {
        OSSL_DECODER_CTX *decoderctx = NULL;
        const char *keytype = "DH";
        int done;

        in = bio_open_default(infile, 'r', informat);
        if (in == NULL)
            goto end;

        do {
            /*
             * We assume we're done unless we explicitly want to retry and set
             * this to 0 below.
             */
            done = 1;
            /*
            * We set NULL for the keytype to allow any key type. We don't know
            * if we're going to get DH or DHX (or DSA in the event of dsaparam).
            * We check that we got one of those key types afterwards.
            */
            decoderctx
                = OSSL_DECODER_CTX_new_for_pkey(&tmppkey,
                                                (informat == FORMAT_ASN1)
                                                    ? "DER" : "PEM",
                                                NULL,
                                                (informat == FORMAT_ASN1)
                                                    ? keytype : NULL,
                                                OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
                                                NULL, NULL);

            if (decoderctx != NULL
                    && !OSSL_DECODER_from_bio(decoderctx, in)
                    && informat == FORMAT_ASN1
                    && strcmp(keytype, "DH") == 0) {
                /*
                * When reading DER we explicitly state the expected keytype
                * because, unlike PEM, there is no header to declare what
                * the contents of the DER file are. The decoders just try
                * and guess. Unfortunately with DHX key types they may guess
                * wrong and think we have a DSA keytype. Therefore, we try
                * both DH and DHX sequentially.
                */
                keytype = "DHX";
                /*
                 * BIO_reset() returns 0 for success for file BIOs only!!!
                 * This won't work for stdin (and never has done)
                 */
                if (BIO_reset(in) == 0)
                    done = 0;
            }
            OSSL_DECODER_CTX_free(decoderctx);
        } while (!done);
        if (tmppkey == NULL) {
            BIO_printf(bio_err, "Error, unable to load parameters\n");
            goto end;
        }

        if (dsaparam) {
            if (!EVP_PKEY_is_a(tmppkey, "DSA")) {
                BIO_printf(bio_err, "Error, unable to load DSA parameters\n");
                goto end;
            }
            pkey = dsa_to_dh(tmppkey);
            if (pkey == NULL)
                goto end;
        } else {
            if (!EVP_PKEY_is_a(tmppkey, "DH")
                    && !EVP_PKEY_is_a(tmppkey, "DHX")) {
                BIO_printf(bio_err, "Error, unable to load DH parameters\n");
                goto end;
            }
            pkey = tmppkey;
            tmppkey = NULL;
        }
    }

    out = bio_open_default(outfile, 'w', outformat);
    if (out == NULL)
        goto end;

    if (text)
        EVP_PKEY_print_params(out, pkey, 4, NULL);

    if (check) {
        ctx = EVP_PKEY_CTX_new_from_pkey(app_get0_libctx(), pkey, app_get0_propq());
        if (ctx == NULL) {
            BIO_printf(bio_err, "Error, failed to check DH parameters\n");
            goto end;
        }
        if (EVP_PKEY_param_check(ctx) <= 0) {
            BIO_printf(bio_err, "Error, invalid parameters generated\n");
            goto end;
        }
        BIO_printf(bio_err, "DH parameters appear to be ok.\n");
    }

    if (!noout) {
        OSSL_ENCODER_CTX *ectx =
            OSSL_ENCODER_CTX_new_for_pkey(pkey,
                                          OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
                                          outformat == FORMAT_ASN1
                                              ? "DER" : "PEM",
                                          NULL, NULL);

        if (ectx == NULL || !OSSL_ENCODER_to_bio(ectx, out)) {
            OSSL_ENCODER_CTX_free(ectx);
            BIO_printf(bio_err, "Error, unable to write DH parameters\n");
            goto end;
        }
        OSSL_ENCODER_CTX_free(ectx);
    }
    ret = 0;
 end:
    if (ret != 0)
        ERR_print_errors(bio_err);
    BIO_free(in);
    BIO_free_all(out);
    EVP_PKEY_free(pkey);
    EVP_PKEY_free(tmppkey);
    EVP_PKEY_CTX_free(ctx);
    release_engine(e);
    return ret;
}

/*
 * Historically we had the low-level call DSA_dup_DH() to do this.
 * That is now deprecated with no replacement. Since we still need to do this
 * for backwards compatibility reasons, we do it "manually".
 */
static EVP_PKEY *dsa_to_dh(EVP_PKEY *dh)
{
    OSSL_PARAM_BLD *tmpl = NULL;
    OSSL_PARAM *params = NULL;
    BIGNUM *bn_p = NULL, *bn_q = NULL, *bn_g = NULL;
    EVP_PKEY_CTX *ctx = NULL;
    EVP_PKEY *pkey = NULL;

    if (!EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_P, &bn_p)
            || !EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_Q, &bn_q)
            || !EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_G, &bn_g)) {
        BIO_printf(bio_err, "Error, failed to set DH parameters\n");
        goto err;
    }

    if ((tmpl = OSSL_PARAM_BLD_new()) == NULL
            || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P,
                                        bn_p)
            || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q,
                                        bn_q)
            || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G,
                                        bn_g)
            || (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) {
        BIO_printf(bio_err, "Error, failed to set DH parameters\n");
        goto err;
    }

    ctx = EVP_PKEY_CTX_new_from_name(app_get0_libctx(), "DHX", app_get0_propq());
    if (ctx == NULL
            || EVP_PKEY_fromdata_init(ctx) <= 0
            || EVP_PKEY_fromdata(ctx, &pkey, EVP_PKEY_KEY_PARAMETERS, params) <= 0) {
        BIO_printf(bio_err, "Error, failed to set DH parameters\n");
        goto err;
    }

 err:
    EVP_PKEY_CTX_free(ctx);
    OSSL_PARAM_free(params);
    OSSL_PARAM_BLD_free(tmpl);
    BN_free(bn_p);
    BN_free(bn_q);
    BN_free(bn_g);
    return pkey;
}
Commit	Line	Data
	1	/*
	2	* Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
	3	*
	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
	8	*/
	9
	10	#include <openssl/opensslconf.h>
	11
	12	#include <stdio.h>
	13	#include <stdlib.h>
	14	#include <time.h>
	15	#include <string.h>
	16	#include "apps.h"
	17	#include "progs.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>
	30
	31	#define DEFBITS 2048
	32
	33	static EVP_PKEY dsa_to_dh(EVP_PKEY dh);
	34
	35	static int verbose = 1;
	36
	37	typedef enum OPTION_choice {
	38	OPT_COMMON,
	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
	43	} OPTION_CHOICE;
	44
	45	const OPTIONS dhparam_options[] = {
	46	{OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits]\n"},
	47
	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"},
	54	#endif
	55	#ifndef OPENSSL_NO_ENGINE
	56	{"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
	57	#endif
	58
	59	OPT_SECTION("Input"),
	60	{"in", OPT_IN, '<', "Input file"},
	61	{"inform", OPT_INFORM, 'F', "Input format, DER or PEM"},
	62
	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"},
	73
	74	OPT_R_OPTIONS,
	75	OPT_PROV_OPTIONS,
	76
	77	OPT_PARAMETERS(),
	78	{"numbits", 0, 0, "Number of bits if generating parameters (optional)"},
	79	{NULL}
	80	};
	81
	82	int dhparam_main(int argc, char **argv)
	83	{
	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;
	88	ENGINE *e = NULL;
	89	int dsaparam = 0;
	90	int text = 0, ret = 1, num = 0, g = 0;
	91	int informat = FORMAT_PEM, outformat = FORMAT_PEM, check = 0, noout = 0;
	92	OPTION_CHOICE o;
	93
	94	prog = opt_init(argc, argv, dhparam_options);
	95	while ((o = opt_next()) != OPT_EOF) {
	96	switch (o) {
	97	case OPT_EOF:
	98	case OPT_ERR:
	99	opthelp:
	100	BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
	101	goto end;
	102	case OPT_HELP:
	103	opt_help(dhparam_options);
	104	ret = 0;
	105	goto end;
	106	case OPT_INFORM:
	107	if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
	108	goto opthelp;
	109	break;
	110	case OPT_OUTFORM:
	111	if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
	112	goto opthelp;
	113	break;
	114	case OPT_IN:
	115	infile = opt_arg();
	116	break;
	117	case OPT_OUT:
	118	outfile = opt_arg();
	119	break;
	120	case OPT_ENGINE:
	121	e = setup_engine(opt_arg(), 0);
	122	break;
	123	case OPT_CHECK:
	124	check = 1;
	125	break;
	126	case OPT_TEXT:
	127	text = 1;
	128	break;
	129	case OPT_DSAPARAM:
	130	dsaparam = 1;
	131	break;
	132	case OPT_2:
	133	g = 2;
	134	break;
	135	case OPT_3:
	136	g = 3;
	137	break;
	138	case OPT_5:
	139	g = 5;
	140	break;
	141	case OPT_NOOUT:
	142	noout = 1;
	143	break;
	144	case OPT_VERBOSE:
	145	verbose = 1;
	146	break;
	147	case OPT_QUIET:
	148	verbose = 0;
	149	break;
	150	case OPT_R_CASES:
	151	if (!opt_rand(o))
	152	goto end;
	153	break;
	154	case OPT_PROV_CASES:
	155	if (!opt_provider(o))
	156	goto end;
	157	break;
	158	}
	159	}
	160
	161	/* One optional argument, bitsize to generate. */
	162	argc = opt_num_rest();
	163	argv = opt_rest();
	164	if (argc == 1) {
	165	if (!opt_int(argv[0], &num) \|\| num <= 0)
	166	goto opthelp;
	167	} else if (!opt_check_rest_arg(NULL)) {
	168	goto opthelp;
	169	}
	170	if (!app_RAND_load())
	171	goto end;
	172
	173	if (g && !num)
	174	num = DEFBITS;
	175
	176	if (dsaparam && g) {
	177	BIO_printf(bio_err,
	178	"Error, generator may not be chosen for DSA parameters\n");
	179	goto end;
	180	}
	181
	182	/* DH parameters */
	183	if (num && !g)
	184	g = 2;
	185
	186	if (num) {
	187	const char *alg = dsaparam ? "DSA" : "DH";
	188
	189	if (infile != NULL) {
	190	BIO_printf(bio_err, "Warning, input file %s ignored\n", infile);
	191	}
	192
	193	ctx = EVP_PKEY_CTX_new_from_name(app_get0_libctx(), alg, app_get0_propq());
	194	if (ctx == NULL) {
	195	BIO_printf(bio_err,
	196	"Error, %s param generation context allocation failed\n",
	197	alg);
	198	goto end;
	199	}
	200	EVP_PKEY_CTX_set_app_data(ctx, bio_err);
	201	if (verbose) {
	202	EVP_PKEY_CTX_set_cb(ctx, progress_cb);
	203	BIO_printf(bio_err,
	204	"Generating %s parameters, %d bit long %sprime\n",
	205	alg, num, dsaparam ? "" : "safe ");
	206	}
	207
	208	if (EVP_PKEY_paramgen_init(ctx) <= 0) {
	209	BIO_printf(bio_err,
	210	"Error, unable to initialise %s parameters\n",
	211	alg);
	212	goto end;
	213	}
	214
	215	if (dsaparam) {
	216	if (EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, num) <= 0) {
	217	BIO_printf(bio_err, "Error, unable to set DSA prime length\n");
	218	goto end;
	219	}
	220	} else {
	221	if (EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, num) <= 0) {
	222	BIO_printf(bio_err, "Error, unable to set DH prime length\n");
	223	goto end;
	224	}
	225	if (EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, g) <= 0) {
	226	BIO_printf(bio_err, "Error, unable to set generator\n");
	227	goto end;
	228	}
	229	}
	230
	231	tmppkey = app_paramgen(ctx, alg);
	232	if (tmppkey == NULL)
	233	goto end;
	234	EVP_PKEY_CTX_free(ctx);
	235	ctx = NULL;
	236	if (dsaparam) {
	237	pkey = dsa_to_dh(tmppkey);
	238	if (pkey == NULL)
	239	goto end;
	240	EVP_PKEY_free(tmppkey);
	241	} else {
	242	pkey = tmppkey;
	243	}
	244	tmppkey = NULL;
	245	} else {
	246	OSSL_DECODER_CTX *decoderctx = NULL;
	247	const char *keytype = "DH";
	248	int done;
	249
	250	in = bio_open_default(infile, 'r', informat);
	251	if (in == NULL)
	252	goto end;
	253
	254	do {
	255	/*
	256	* We assume we're done unless we explicitly want to retry and set
	257	* this to 0 below.
	258	*/
	259	done = 1;
	260	/*
	261	* We set NULL for the keytype to allow any key type. We don't know
	262	* if we're going to get DH or DHX (or DSA in the event of dsaparam).
	263	* We check that we got one of those key types afterwards.
	264	*/
	265	decoderctx
	266	= OSSL_DECODER_CTX_new_for_pkey(&tmppkey,
	267	(informat == FORMAT_ASN1)
	268	? "DER" : "PEM",
	269	NULL,
	270	(informat == FORMAT_ASN1)
	271	? keytype : NULL,
	272	OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
	273	NULL, NULL);
	274
	275	if (decoderctx != NULL
	276	&& !OSSL_DECODER_from_bio(decoderctx, in)
	277	&& informat == FORMAT_ASN1
	278	&& strcmp(keytype, "DH") == 0) {
	279	/*
	280	* When reading DER we explicitly state the expected keytype
	281	* because, unlike PEM, there is no header to declare what
	282	* the contents of the DER file are. The decoders just try
	283	* and guess. Unfortunately with DHX key types they may guess
	284	* wrong and think we have a DSA keytype. Therefore, we try
	285	* both DH and DHX sequentially.
	286	*/
	287	keytype = "DHX";
	288	/*
	289	* BIO_reset() returns 0 for success for file BIOs only!!!
	290	* This won't work for stdin (and never has done)
	291	*/
	292	if (BIO_reset(in) == 0)
	293	done = 0;
	294	}
	295	OSSL_DECODER_CTX_free(decoderctx);
	296	} while (!done);
	297	if (tmppkey == NULL) {
	298	BIO_printf(bio_err, "Error, unable to load parameters\n");
	299	goto end;
	300	}
	301
	302	if (dsaparam) {
	303	if (!EVP_PKEY_is_a(tmppkey, "DSA")) {
	304	BIO_printf(bio_err, "Error, unable to load DSA parameters\n");
	305	goto end;
	306	}
	307	pkey = dsa_to_dh(tmppkey);
	308	if (pkey == NULL)
	309	goto end;
	310	} else {
	311	if (!EVP_PKEY_is_a(tmppkey, "DH")
	312	&& !EVP_PKEY_is_a(tmppkey, "DHX")) {
	313	BIO_printf(bio_err, "Error, unable to load DH parameters\n");
	314	goto end;
	315	}
	316	pkey = tmppkey;
	317	tmppkey = NULL;
	318	}
	319	}
	320
	321	out = bio_open_default(outfile, 'w', outformat);
	322	if (out == NULL)
	323	goto end;
	324
	325	if (text)
	326	EVP_PKEY_print_params(out, pkey, 4, NULL);
	327
	328	if (check) {
	329	ctx = EVP_PKEY_CTX_new_from_pkey(app_get0_libctx(), pkey, app_get0_propq());
	330	if (ctx == NULL) {
	331	BIO_printf(bio_err, "Error, failed to check DH parameters\n");
	332	goto end;
	333	}
	334	if (EVP_PKEY_param_check(ctx) <= 0) {
	335	BIO_printf(bio_err, "Error, invalid parameters generated\n");
	336	goto end;
	337	}
	338	BIO_printf(bio_err, "DH parameters appear to be ok.\n");
	339	}
	340
	341	if (!noout) {
	342	OSSL_ENCODER_CTX *ectx =
	343	OSSL_ENCODER_CTX_new_for_pkey(pkey,
	344	OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
	345	outformat == FORMAT_ASN1
	346	? "DER" : "PEM",
	347	NULL, NULL);
	348
	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");
	352	goto end;
	353	}
	354	OSSL_ENCODER_CTX_free(ectx);
	355	}
	356	ret = 0;
	357	end:
	358	if (ret != 0)
	359	ERR_print_errors(bio_err);
	360	BIO_free(in);
	361	BIO_free_all(out);
	362	EVP_PKEY_free(pkey);
	363	EVP_PKEY_free(tmppkey);
	364	EVP_PKEY_CTX_free(ctx);
	365	release_engine(e);
	366	return ret;
	367	}
	368
	369	/*
	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".
	373	*/
	374	static EVP_PKEY dsa_to_dh(EVP_PKEY dh)
	375	{
	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;
	381
	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");
	386	goto err;
	387	}
	388
	389	if ((tmpl = OSSL_PARAM_BLD_new()) == NULL
	390	\|\| !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P,
	391	bn_p)
	392	\|\| !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q,
	393	bn_q)
	394	\|\| !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G,
	395	bn_g)
	396	\|\| (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) {
	397	BIO_printf(bio_err, "Error, failed to set DH parameters\n");
	398	goto err;
	399	}
	400
	401	ctx = EVP_PKEY_CTX_new_from_name(app_get0_libctx(), "DHX", app_get0_propq());
	402	if (ctx == NULL
	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");
	406	goto err;
	407	}
	408
	409	err:
	410	EVP_PKEY_CTX_free(ctx);
	411	OSSL_PARAM_free(params);
	412	OSSL_PARAM_BLD_free(tmpl);
	413	BN_free(bn_p);
	414	BN_free(bn_q);
	415	BN_free(bn_g);
	416	return pkey;
	417	}
	418