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openssl/apps/dhparam.c

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/*
* Copyright 1995-2020 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
*/
#ifndef OPENSSL_NO_DEPRECATED_3_0
/* We need to use some deprecated APIs */
# define OPENSSL_SUPPRESS_DEPRECATED
#endif
#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/dh.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#if !defined(OPENSSL_NO_DSA) && !defined(OPENSSL_NO_DEPRECATED_3_0)
# include <openssl/dsa.h>
#endif
#define DEFBITS 2048
#if !defined(OPENSSL_NO_DSA) && !defined(OPENSSL_NO_DEPRECATED_3_0)
static int dh_cb(int p, int n, BN_GENCB *cb);
#endif
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_C, 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"},
#ifndef OPENSSL_NO_DSA
{"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"},
{"C", OPT_C, '-', "Print C code"},
{"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;
DH *dh = NULL, *alloc_dh = NULL;
EVP_PKEY *pkey = NULL;
EVP_PKEY_CTX *ctx = NULL;
char *infile = NULL, *outfile = NULL, *prog;
ENGINE *e = NULL;
#if !defined(OPENSSL_NO_DSA) && !defined(OPENSSL_NO_DEPRECATED_3_0)
int dsaparam = 0;
#endif
int i, text = 0, C = 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:
#ifndef OPENSSL_NO_DSA
# ifdef OPENSSL_NO_DEPRECATED_3_0
BIO_printf(bio_err, "The dsaparam option is deprecated.\n");
# else
dsaparam = 1;
# endif
#endif
break;
case OPT_C:
C = 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;
}
}
argc = opt_num_rest();
argv = opt_rest();
if (argv[0] != NULL && (!opt_int(argv[0], &num) || num <= 0))
goto end;
if (g && !num)
num = DEFBITS;
#if !defined(OPENSSL_NO_DSA) && !defined(OPENSSL_NO_DEPRECATED_3_0)
if (dsaparam && g) {
BIO_printf(bio_err,
"Error, generator may not be chosen for DSA parameters\n");
goto end;
}
#endif
out = bio_open_default(outfile, 'w', outformat);
if (out == NULL)
goto end;
/* DH parameters */
if (num && !g)
g = 2;
if (num) {
#if !defined(OPENSSL_NO_DSA) && !defined(OPENSSL_NO_DEPRECATED_3_0)
if (dsaparam) {
DSA *dsa = DSA_new();
BN_GENCB *cb = BN_GENCB_new();
if (cb == NULL)
goto end;
BN_GENCB_set(cb, dh_cb, bio_err);
BIO_printf(bio_err,
"Generating DSA parameters, %d bit long prime\n", num);
if (dsa == NULL
|| !DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL,
cb)) {
DSA_free(dsa);
BN_GENCB_free(cb);
BIO_printf(bio_err, "Error, unable to generate DSA parameters\n");
goto end;
}
dh = alloc_dh = DSA_dup_DH(dsa);
DSA_free(dsa);
BN_GENCB_free(cb);
if (dh == NULL)
goto end;
} else
#endif
{
ctx = EVP_PKEY_CTX_new_from_name(NULL, "DH", NULL);
if (ctx == NULL) {
BIO_printf(bio_err,
"Error, DH key generation context allocation failed\n");
goto end;
}
EVP_PKEY_CTX_set_cb(ctx, gendh_cb);
EVP_PKEY_CTX_set_app_data(ctx, bio_err);
BIO_printf(bio_err,
"Generating DH parameters, %d bit long safe prime, generator %d\n",
num, g);
BIO_printf(bio_err, "This is going to take a long time\n");
if (!EVP_PKEY_paramgen_init(ctx)) {
BIO_printf(bio_err,
"Error, unable to initialise DH param generation\n");
goto end;
}
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_paramgen(ctx, &pkey)) {
BIO_printf(bio_err, "Error, DH generation failed\n");
goto end;
}
dh = EVP_PKEY_get0_DH(pkey);
}
} else {
in = bio_open_default(infile, 'r', informat);
if (in == NULL)
goto end;
#if !defined(OPENSSL_NO_DSA) && !defined(OPENSSL_NO_DEPRECATED_3_0)
if (dsaparam) {
DSA *dsa;
if (informat == FORMAT_ASN1)
dsa = d2i_DSAparams_bio(in, NULL);
else /* informat == FORMAT_PEM */
dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
if (dsa == NULL) {
BIO_printf(bio_err, "Error, unable to load DSA parameters\n");
goto end;
}
dh = alloc_dh = DSA_dup_DH(dsa);
DSA_free(dsa);
if (dh == NULL)
goto end;
} else
#endif
{
if (informat == FORMAT_ASN1) {
/*
* We have no PEM header to determine what type of DH params it
* is. We'll just try both.
*/
dh = alloc_dh = ASN1_d2i_bio_of(DH, DH_new, d2i_DHparams, in, NULL);
/* BIO_reset() returns 0 for success for file BIOs only!!! */
if (dh == NULL && BIO_reset(in) == 0)
dh = alloc_dh = ASN1_d2i_bio_of(DH, DH_new, d2i_DHxparams, in, NULL);
} else {
/* informat == FORMAT_PEM */
dh = alloc_dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
}
if (dh == NULL) {
BIO_printf(bio_err, "Error, unable to load DH parameters\n");
goto end;
}
}
/* dh != NULL */
}
if (text)
EVP_PKEY_print_params(out, pkey, 4, NULL);
if (check) {
if (!EVP_PKEY_param_check(ctx) /* DH_check(dh, &i) */) {
BIO_printf(bio_err, "Error, invalid parameters generated\n");
goto end;
}
BIO_printf(bio_err, "DH parameters appear to be ok.\n");
if (num != 0) {
/*
* We have generated parameters but DH_check() indicates they are
* invalid! This should never happen!
*/
BIO_printf(bio_err, "Error, invalid parameters generated\n");
goto end;
}
}
if (C) {
unsigned char *data;
int len, bits;
const BIGNUM *pbn, *gbn;
dh = EVP_PKEY_get0_DH(pkey);
len = EVP_PKEY_size(pkey);
bits = EVP_PKEY_size(pkey);
DH_get0_pqg(dh, &pbn, NULL, &gbn);
data = app_malloc(len, "print a BN");
BIO_printf(out, "static DH *get_dh%d(void)\n{\n", bits);
print_bignum_var(out, pbn, "dhp", bits, data);
print_bignum_var(out, gbn, "dhg", bits, data);
BIO_printf(out, " DH *dh = DH_new();\n"
" BIGNUM *p, *g;\n"
"\n"
" if (dh == NULL)\n"
" return NULL;\n");
BIO_printf(out, " p = BN_bin2bn(dhp_%d, sizeof(dhp_%d), NULL);\n",
bits, bits);
BIO_printf(out, " g = BN_bin2bn(dhg_%d, sizeof(dhg_%d), NULL);\n",
bits, bits);
BIO_printf(out, " if (p == NULL || g == NULL\n"
" || !DH_set0_pqg(dh, p, NULL, g)) {\n"
" DH_free(dh);\n"
" BN_free(p);\n"
" BN_free(g);\n"
" return NULL;\n"
" }\n");
if (DH_get_length(dh) > 0)
BIO_printf(out,
" if (!DH_set_length(dh, %ld)) {\n"
" DH_free(dh);\n"
" return NULL;\n"
" }\n", DH_get_length(dh));
BIO_printf(out, " return dh;\n}\n");
OPENSSL_free(data);
}
if (!noout) {
const BIGNUM *q;
DH_get0_pqg(dh, NULL, &q, NULL);
if (outformat == FORMAT_ASN1) {
if (q != NULL)
i = ASN1_i2d_bio_of(DH, i2d_DHxparams, out, dh);
else
i = ASN1_i2d_bio_of(DH, i2d_DHparams, out, dh);
} else if (q != NULL) {
i = PEM_write_bio_DHxparams(out, dh);
} else {
i = PEM_write_bio_DHparams(out, dh);
}
if (!i) {
BIO_printf(bio_err, "Error, unable to write DH parameters\n");
goto end;
}
}
ret = 0;
end:
if (ret != 0)
ERR_print_errors(bio_err);
DH_free(alloc_dh);
BIO_free(in);
BIO_free_all(out);
EVP_PKEY_free(pkey);
EVP_PKEY_CTX_free(ctx);
release_engine(e);
return ret;
}
static int common_dh_cb(int p, BIO *b)
{
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;
}
#if !defined(OPENSSL_NO_DSA) && !defined(OPENSSL_NO_DEPRECATED_3_0)
static int dh_cb(int p, int n, BN_GENCB *cb)
{
return common_dh_cb(p, BN_GENCB_get_arg(cb));
}
#endif
static int gendh_cb(EVP_PKEY_CTX *ctx)
{
return common_dh_cb(EVP_PKEY_CTX_get_keygen_info(ctx, 0),
EVP_PKEY_CTX_get_app_data(ctx));
}
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