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openssl/apps/dhparam.c

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/*
* 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_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_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;
}
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;
}
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;
}
}
tmppkey = app_paramgen(ctx, alg);
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;
}
}
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_free(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;
}
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