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

/*
 * Copyright 1995-2021 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 gendh_cb(EVP_PKEY_CTX *ctx);

typedef enum OPTION_choice {
    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
    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_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"},

    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_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 (argc != 0) {
        goto opthelp;
    }
    app_RAND_load();


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

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

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

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

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

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

        if (!EVP_PKEY_paramgen_init(ctx)) {
            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)) {
                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)) {
                BIO_printf(bio_err, "Error, unable to set DH prime length\n");
                goto end;
            }
            if (!EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, g)) {
                BIO_printf(bio_err, "Error, unable to set generator\n");
                goto end;
            }
        }

        if (!EVP_PKEY_paramgen(ctx, &tmppkey)) {
            BIO_printf(bio_err, "Error, %s generation failed\n", alg);
            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)
                    * TODO: We should fix this at some point
                    */
                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;
        }
    }

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

    if (check) {
        ctx = EVP_PKEY_CTX_new_from_pkey(NULL, pkey, NULL);
        if (ctx == NULL) {
            BIO_printf(bio_err, "Error, failed to check DH parameters\n");
            goto end;
        }
        if (!EVP_PKEY_param_check(ctx)) {
            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(NULL, "DHX", NULL);
    if (ctx == NULL
            || !EVP_PKEY_fromdata_init(ctx)
            || !EVP_PKEY_fromdata(ctx, &pkey, EVP_PKEY_KEY_PARAMETERS, params)) {
        BIO_printf(bio_err, "Error, failed to set DH parameters\n");
        goto err;
    }

 err:
    EVP_PKEY_CTX_free(ctx);
    OSSL_PARAM_BLD_free_params(params);
    OSSL_PARAM_BLD_free(tmpl);
    BN_free(bn_p);
    BN_free(bn_q);
    BN_free(bn_g);
    return pkey;
}

static int gendh_cb(EVP_PKEY_CTX *ctx)
{
    int p = EVP_PKEY_CTX_get_keygen_info(ctx, 0);
    BIO *b = EVP_PKEY_CTX_get_app_data(ctx);
    static const char symbols[] = ".+*\n";
    char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?';

    BIO_write(b, &c, 1);
    (void)BIO_flush(b);
    return 1;
}
Commit	Line	Data
846e33c7	1	/*
a28d06f3	2	* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
41918458	3	*
dffa7520	4	* Licensed under the Apache License 2.0 (the "License"). You may not use
846e33c7 RS	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
41918458	8	*/
09483c58	9
effaf4de	10	#include <openssl/opensslconf.h>
1ae56f2f RS	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>
4ccf4e76 MC	21	#include <openssl/dsa.h>
4ccf4e76 MC	22	#include <openssl/dh.h>
1ae56f2f RS	23	#include <openssl/x509.h>
1ae56f2f RS	24	#include <openssl/pem.h>
88d1389c	25	#include <openssl/core_names.h>
4ccf4e76	26	#include <openssl/core_dispatch.h>
88d1389c	27	#include <openssl/param_build.h>
4ccf4e76	28	#include <openssl/encoder.h>
88d1389c	29	#include <openssl/decoder.h>
1ae56f2f RS	30
1ae56f2f RS	31	#define DEFBITS 2048
09483c58	32
88d1389c	33	static EVP_PKEY dsa_to_dh(EVP_PKEY dh);
ccefc341	34	static int gendh_cb(EVP_PKEY_CTX *ctx);
09483c58	35
7e1b7485 RS	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,
1696b890	40	OPT_DSAPARAM, OPT_2, OPT_3, OPT_5,
6bd4e3f2	41	OPT_R_ENUM, OPT_PROV_ENUM
7e1b7485 RS	42	} OPTION_CHOICE;
7e1b7485 RS	43
44c83ebd	44	const OPTIONS dhparam_options[] = {
92de469f	45	{OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits]\n"},
5388f986 RS	46
5388f986 RS	47	OPT_SECTION("General"),
7e1b7485	48	{"help", OPT_HELP, '-', "Display this summary"},
5388f986	49	{"check", OPT_CHECK, '-', "Check the DH parameters"},
47422549	50	#if !defined(OPENSSL_NO_DSA) \|\| !defined(OPENSSL_NO_DEPRECATED_3_0)
5388f986 RS	51	{"dsaparam", OPT_DSAPARAM, '-',
5388f986 RS	52	"Read or generate DSA parameters, convert to DH"},
47422549	53	#endif
1ae56f2f	54	#ifndef OPENSSL_NO_ENGINE
5388f986	55	{"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
1ae56f2f	56	#endif
5388f986 RS	57
5388f986 RS	58	OPT_SECTION("Input"),
7e1b7485 RS	59	{"in", OPT_IN, '<', "Input file"},
7e1b7485 RS	60	{"inform", OPT_INFORM, 'F', "Input format, DER or PEM"},
5388f986 RS	61
5388f986 RS	62	OPT_SECTION("Output"),
7e1b7485	63	{"out", OPT_OUT, '>', "Output file"},
5388f986	64	{"outform", OPT_OUTFORM, 'F', "Output format, DER or PEM"},
7e1b7485	65	{"text", OPT_TEXT, '-', "Print a text form of the DH parameters"},
16e1b281	66	{"noout", OPT_NOOUT, '-', "Don't output any DH parameters"},
7e1b7485	67	{"2", OPT_2, '-', "Generate parameters using 2 as the generator value"},
a38c878c	68	{"3", OPT_3, '-', "Generate parameters using 3 as the generator value"},
7e1b7485	69	{"5", OPT_5, '-', "Generate parameters using 5 as the generator value"},
5388f986 RS	70
5388f986 RS	71	OPT_R_OPTIONS,
6bd4e3f2	72	OPT_PROV_OPTIONS,
92de469f RS	73
	74	OPT_PARAMETERS(),
	75	{"numbits", 0, 0, "Number of bits if generating parameters (optional)"},
7e1b7485 RS	76	{NULL}
	77	};
	78
	79	int dhparam_main(int argc, char **argv)
	80	{
	81	BIO in = NULL, out = NULL;
88d1389c	82	EVP_PKEY pkey = NULL, tmppkey = NULL;
ccefc341	83	EVP_PKEY_CTX *ctx = NULL;
3ee1eac2	84	char infile = NULL, outfile = NULL, *prog;
dd1abd44	85	ENGINE *e = NULL;
83ae8124	86	int dsaparam = 0;
4ccf4e76	87	int text = 0, ret = 1, num = 0, g = 0;
7e1b7485 RS	88	int informat = FORMAT_PEM, outformat = FORMAT_PEM, check = 0, noout = 0;
	89	OPTION_CHOICE o;
	90
	91	prog = opt_init(argc, argv, dhparam_options);
	92	while ((o = opt_next()) != OPT_EOF) {
	93	switch (o) {
	94	case OPT_EOF:
	95	case OPT_ERR:
	96	opthelp:
	97	BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
	98	goto end;
	99	case OPT_HELP:
	100	opt_help(dhparam_options);
	101	ret = 0;
	102	goto end;
	103	case OPT_INFORM:
	104	if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
	105	goto opthelp;
	106	break;
	107	case OPT_OUTFORM:
	108	if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
	109	goto opthelp;
	110	break;
	111	case OPT_IN:
	112	infile = opt_arg();
	113	break;
	114	case OPT_OUT:
	115	outfile = opt_arg();
	116	break;
	117	case OPT_ENGINE:
dd1abd44	118	e = setup_engine(opt_arg(), 0);
7e1b7485 RS	119	break;
7e1b7485 RS	120	case OPT_CHECK:
0f113f3e	121	check = 1;
7e1b7485 RS	122	break;
7e1b7485 RS	123	case OPT_TEXT:
0f113f3e	124	text = 1;
7e1b7485 RS	125	break;
7e1b7485 RS	126	case OPT_DSAPARAM:
0f113f3e	127	dsaparam = 1;
7e1b7485	128	break;
7e1b7485	129	case OPT_2:
0f113f3e	130	g = 2;
7e1b7485	131	break;
a38c878c BE	132	case OPT_3:
	133	g = 3;
	134	break;
7e1b7485	135	case OPT_5:
0f113f3e	136	g = 5;
7e1b7485 RS	137	break;
	138	case OPT_NOOUT:
	139	noout = 1;
	140	break;
3ee1eac2 RS	141	case OPT_R_CASES:
	142	if (!opt_rand(o))
	143	goto end;
7e1b7485	144	break;
6bd4e3f2 P	145	case OPT_PROV_CASES:
	146	if (!opt_provider(o))
	147	goto end;
	148	break;
7e1b7485	149	}
0f113f3e	150	}
021410ea RS	151
021410ea RS	152	/* One optional argument, bitsize to generate. */
7e1b7485 RS	153	argc = opt_num_rest();
7e1b7485 RS	154	argv = opt_rest();
021410ea RS	155	if (argc == 1) {
	156	if (!opt_int(argv[0], &num) \|\| num <= 0)
	157	goto opthelp;
	158	} else if (argc != 0) {
	159	goto opthelp;
	160	}
51e5df0e	161	app_RAND_load();
0f113f3e	162
0f113f3e	163
0f113f3e MC	164	if (g && !num)
	165	num = DEFBITS;
	166
7e1b7485 RS	167	if (dsaparam && g) {
7e1b7485 RS	168	BIO_printf(bio_err,
2a3158ac	169	"Error, generator may not be chosen for DSA parameters\n");
7e1b7485	170	goto end;
0f113f3e	171	}
10b37541 RL	172
	173	out = bio_open_default(outfile, 'w', outformat);
	174	if (out == NULL)
	175	goto end;
	176
7e1b7485 RS	177	/* DH parameters */
	178	if (num && !g)
	179	g = 2;
0f113f3e MC	180
0f113f3e MC	181	if (num) {
88d1389c	182	const char *alg = dsaparam ? "DSA" : "DH";
0f113f3e	183
88d1389c MC	184	ctx = EVP_PKEY_CTX_new_from_name(NULL, alg, NULL);
88d1389c MC	185	if (ctx == NULL) {
0f113f3e	186	BIO_printf(bio_err,
88d1389c MC	187	"Error, %s param generation context allocation failed\n",
	188	alg);
	189	goto end;
	190	}
	191	EVP_PKEY_CTX_set_cb(ctx, gendh_cb);
	192	EVP_PKEY_CTX_set_app_data(ctx, bio_err);
	193	BIO_printf(bio_err,
	194	"Generating %s parameters, %d bit long %sprime\n",
	195	alg, num, dsaparam ? "" : "safe ");
0f113f3e	196
88d1389c	197	if (!EVP_PKEY_paramgen_init(ctx)) {
0f113f3e	198	BIO_printf(bio_err,
88d1389c MC	199	"Error, unable to initialise %s parameters\n",
	200	alg);
	201	goto end;
	202	}
	203
	204	if (dsaparam) {
	205	if (!EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, num)) {
	206	BIO_printf(bio_err, "Error, unable to set DSA prime length\n");
ccefc341 P	207	goto end;
ccefc341 P	208	}
88d1389c	209	} else {
ccefc341 P	210	if (!EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, num)) {
ccefc341 P	211	BIO_printf(bio_err, "Error, unable to set DH prime length\n");
ccefc341 P	212	goto end;
ccefc341 P	213	}
88d1389c MC	214	if (!EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, g)) {
88d1389c MC	215	BIO_printf(bio_err, "Error, unable to set generator\n");
0f113f3e MC	216	goto end;
	217	}
	218	}
88d1389c MC	219
	220	if (!EVP_PKEY_paramgen(ctx, &tmppkey)) {
	221	BIO_printf(bio_err, "Error, %s generation failed\n", alg);
	222	goto end;
	223	}
	224
	225	EVP_PKEY_CTX_free(ctx);
	226	ctx = NULL;
	227	if (dsaparam) {
	228	pkey = dsa_to_dh(tmppkey);
	229	if (pkey == NULL)
	230	goto end;
	231	EVP_PKEY_free(tmppkey);
	232	} else {
	233	pkey = tmppkey;
	234	}
	235	tmppkey = NULL;
0f113f3e	236	} else {
88d1389c MC	237	OSSL_DECODER_CTX *decoderctx = NULL;
	238	const char *keytype = "DH";
	239	int done;
	240
bdd58d98	241	in = bio_open_default(infile, 'r', informat);
7e1b7485	242	if (in == NULL)
0f113f3e	243	goto end;
0f113f3e	244
88d1389c MC	245	do {
	246	/*
	247	* We assume we're done unless we explicitly want to retry and set
	248	* this to 0 below.
	249	*/
	250	done = 1;
	251	/*
	252	* We set NULL for the keytype to allow any key type. We don't know
	253	* if we're going to get DH or DHX (or DSA in the event of dsaparam).
	254	* We check that we got one of those key types afterwards.
	255	*/
	256	decoderctx
fe75766c TM	257	= OSSL_DECODER_CTX_new_for_pkey(&tmppkey,
fe75766c TM	258	(informat == FORMAT_ASN1)
88d1389c	259	? "DER" : "PEM",
fe75766c TM	260	NULL,
fe75766c TM	261	(informat == FORMAT_ASN1)
88d1389c	262	? keytype : NULL,
fe75766c TM	263	OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
fe75766c TM	264	NULL, NULL);
88d1389c MC	265
	266	if (decoderctx != NULL
	267	&& !OSSL_DECODER_from_bio(decoderctx, in)
	268	&& informat == FORMAT_ASN1
	269	&& strcmp(keytype, "DH") == 0) {
	270	/*
	271	* When reading DER we explicitly state the expected keytype
	272	* because, unlike PEM, there is no header to declare what
	273	* the contents of the DER file are. The decoders just try
	274	* and guess. Unfortunately with DHX key types they may guess
	275	* wrong and think we have a DSA keytype. Therefore we try
	276	* both DH and DHX sequentially.
	277	*/
	278	keytype = "DHX";
	279	/*
	280	* BIO_reset() returns 0 for success for file BIOs only!!!
	281	* This won't work for stdin (and never has done)
	282	* TODO: We should fix this at some point
	283	*/
	284	if (BIO_reset(in) == 0)
	285	done = 0;
	286	}
	287	OSSL_DECODER_CTX_free(decoderctx);
	288	} while (!done);
	289	if (tmppkey == NULL) {
	290	BIO_printf(bio_err, "Error, unable to load parameters\n");
	291	goto end;
	292	}
0f113f3e	293
88d1389c MC	294	if (dsaparam) {
88d1389c MC	295	if (!EVP_PKEY_is_a(tmppkey, "DSA")) {
2a3158ac	296	BIO_printf(bio_err, "Error, unable to load DSA parameters\n");
0f113f3e MC	297	goto end;
0f113f3e MC	298	}
88d1389c MC	299	pkey = dsa_to_dh(tmppkey);
88d1389c MC	300	if (pkey == NULL)
0f113f3e	301	goto end;
88d1389c MC	302	} else {
	303	if (!EVP_PKEY_is_a(tmppkey, "DH")
	304	&& !EVP_PKEY_is_a(tmppkey, "DHX")) {
2a3158ac	305	BIO_printf(bio_err, "Error, unable to load DH parameters\n");
0f113f3e MC	306	goto end;
0f113f3e MC	307	}
88d1389c MC	308	pkey = tmppkey;
88d1389c MC	309	tmppkey = NULL;
0f113f3e	310	}
0f113f3e MC	311	}
0f113f3e MC	312
ccefc341 P	313	if (text)
ccefc341 P	314	EVP_PKEY_print_params(out, pkey, 4, NULL);
0f113f3e MC	315
0f113f3e MC	316	if (check) {
4ccf4e76	317	ctx = EVP_PKEY_CTX_new_from_pkey(NULL, pkey, NULL);
88d1389c MC	318	if (ctx == NULL) {
	319	BIO_printf(bio_err, "Error, failed to check DH parameters\n");
	320	goto end;
	321	}
4ccf4e76	322	if (!EVP_PKEY_param_check(ctx)) {
2a3158ac	323	BIO_printf(bio_err, "Error, invalid parameters generated\n");
0f113f3e MC	324	goto end;
0f113f3e MC	325	}
ccefc341	326	BIO_printf(bio_err, "DH parameters appear to be ok.\n");
0f113f3e	327	}
0f113f3e MC	328
0f113f3e MC	329	if (!noout) {
4ccf4e76	330	OSSL_ENCODER_CTX *ectx =
fe75766c TM	331	OSSL_ENCODER_CTX_new_for_pkey(pkey,
	332	OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
	333	outformat == FORMAT_ASN1
	334	? "DER" : "PEM",
	335	NULL, NULL);
4ccf4e76 MC	336
	337	if (ectx == NULL \|\| !OSSL_ENCODER_to_bio(ectx, out)) {
	338	OSSL_ENCODER_CTX_free(ectx);
2a3158ac	339	BIO_printf(bio_err, "Error, unable to write DH parameters\n");
0f113f3e MC	340	goto end;
0f113f3e MC	341	}
4ccf4e76	342	OSSL_ENCODER_CTX_free(ectx);
0f113f3e MC	343	}
	344	ret = 0;
	345	end:
2a3158ac DDO	346	if (ret != 0)
2a3158ac DDO	347	ERR_print_errors(bio_err);
ca3a82c3 RS	348	BIO_free(in);
ca3a82c3 RS	349	BIO_free_all(out);
ccefc341	350	EVP_PKEY_free(pkey);
88d1389c	351	EVP_PKEY_free(tmppkey);
ccefc341	352	EVP_PKEY_CTX_free(ctx);
dd1abd44	353	release_engine(e);
26a7d938	354	return ret;
0f113f3e	355	}
09483c58	356
88d1389c MC	357	/*
	358	* Historically we had the low level call DSA_dup_DH() to do this.
	359	* That is now deprecated with no replacement. Since we still need to do this
	360	* for backwards compatibility reasons, we do it "manually".
	361	*/
	362	static EVP_PKEY dsa_to_dh(EVP_PKEY dh)
0f113f3e	363	{
88d1389c MC	364	OSSL_PARAM_BLD *tmpl = NULL;
	365	OSSL_PARAM *params = NULL;
	366	BIGNUM bn_p = NULL, bn_q = NULL, *bn_g = NULL;
	367	EVP_PKEY_CTX *ctx = NULL;
	368	EVP_PKEY *pkey = NULL;
201b305a	369
88d1389c MC	370	if (!EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_P, &bn_p)
	371	\|\| !EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_Q, &bn_q)
	372	\|\| !EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_G, &bn_g)) {
	373	BIO_printf(bio_err, "Error, failed to set DH parameters\n");
	374	goto err;
	375	}
ccefc341	376
88d1389c MC	377	if ((tmpl = OSSL_PARAM_BLD_new()) == NULL
	378	\|\| !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P,
	379	bn_p)
	380	\|\| !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q,
	381	bn_q)
	382	\|\| !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G,
	383	bn_g)
	384	\|\| (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) {
	385	BIO_printf(bio_err, "Error, failed to set DH parameters\n");
	386	goto err;
	387	}
	388
	389	ctx = EVP_PKEY_CTX_new_from_name(NULL, "DHX", NULL);
	390	if (ctx == NULL
2db985b7 SL	391	\|\| !EVP_PKEY_fromdata_init(ctx)
2db985b7 SL	392	\|\| !EVP_PKEY_fromdata(ctx, &pkey, EVP_PKEY_KEY_PARAMETERS, params)) {
88d1389c MC	393	BIO_printf(bio_err, "Error, failed to set DH parameters\n");
	394	goto err;
	395	}
	396
	397	err:
	398	EVP_PKEY_CTX_free(ctx);
	399	OSSL_PARAM_BLD_free_params(params);
	400	OSSL_PARAM_BLD_free(tmpl);
	401	BN_free(bn_p);
	402	BN_free(bn_q);
	403	BN_free(bn_g);
	404	return pkey;
ccefc341	405	}
ccefc341 P	406
	407	static int gendh_cb(EVP_PKEY_CTX *ctx)
	408	{
88d1389c MC	409	int p = EVP_PKEY_CTX_get_keygen_info(ctx, 0);
	410	BIO *b = EVP_PKEY_CTX_get_app_data(ctx);
	411	static const char symbols[] = ".+*\n";
	412	char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?';
	413
	414	BIO_write(b, &c, 1);
	415	(void)BIO_flush(b);
	416	return 1;
ccefc341	417	}