A local copy of OpenSSL from GitHub
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/*
* Copyright 1995-2018 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
*/
/* We need to use some deprecated APIs */
#define OPENSSL_SUPPRESS_DEPRECATED
#include <openssl/opensslconf.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.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/x509.h>
#include <openssl/pem.h>
typedef enum OPTION_choice {
OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_CIPHER, OPT_VERBOSE,
OPT_R_ENUM, OPT_PROV_ENUM
} OPTION_CHOICE;
const OPTIONS gendsa_options[] = {
{OPT_HELP_STR, 1, '-', "Usage: %s [options] dsaparam-file\n"},
OPT_SECTION("General"),
{"help", OPT_HELP, '-', "Display this summary"},
#ifndef OPENSSL_NO_ENGINE
{"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
#endif
OPT_SECTION("Output"),
{"out", OPT_OUT, '>', "Output the key to the specified file"},
{"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
OPT_R_OPTIONS,
OPT_PROV_OPTIONS,
{"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
{"verbose", OPT_VERBOSE, '-', "Verbose output"},
OPT_PARAMETERS(),
{"dsaparam-file", 0, 0, "File containing DSA parameters"},
{NULL}
};
int gendsa_main(int argc, char **argv)
{
ENGINE *e = NULL;
BIO *out = NULL, *in = NULL;
DSA *dsa = NULL;
const EVP_CIPHER *enc = NULL;
char *dsaparams = NULL;
char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
OPTION_CHOICE o;
int ret = 1, private = 0, verbose = 0;
const BIGNUM *p = NULL;
prog = opt_init(argc, argv, gendsa_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:
ret = 0;
opt_help(gendsa_options);
goto end;
case OPT_OUT:
outfile = opt_arg();
break;
case OPT_PASSOUT:
passoutarg = opt_arg();
break;
case OPT_ENGINE:
e = setup_engine(opt_arg(), 0);
break;
case OPT_R_CASES:
if (!opt_rand(o))
goto end;
break;
case OPT_PROV_CASES:
if (!opt_provider(o))
goto end;
break;
case OPT_CIPHER:
if (!opt_cipher(opt_unknown(), &enc))
goto end;
break;
case OPT_VERBOSE:
verbose = 1;
break;
}
}
argc = opt_num_rest();
argv = opt_rest();
private = 1;
if (argc != 1)
goto opthelp;
dsaparams = *argv;
if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
BIO_printf(bio_err, "Error getting password\n");
goto end;
}
in = bio_open_default(dsaparams, 'r', FORMAT_PEM);
if (in == NULL)
goto end2;
if ((dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL)) == NULL) {
BIO_printf(bio_err, "unable to load DSA parameter file\n");
goto end;
}
BIO_free(in);
in = NULL;
out = bio_open_owner(outfile, FORMAT_PEM, private);
if (out == NULL)
goto end2;
DSA_get0_pqg(dsa, &p, NULL, NULL);
if (BN_num_bits(p) > OPENSSL_DSA_MAX_MODULUS_BITS)
BIO_printf(bio_err,
"Warning: It is not recommended to use more than %d bit for DSA keys.\n"
" Your key size is %d! Larger key size may behave not as expected.\n",
OPENSSL_DSA_MAX_MODULUS_BITS, BN_num_bits(p));
if (verbose)
BIO_printf(bio_err, "Generating DSA key, %d bits\n", BN_num_bits(p));
if (!DSA_generate_key(dsa))
goto end;
assert(private);
if (!PEM_write_bio_DSAPrivateKey(out, dsa, enc, NULL, 0, NULL, passout))
goto end;
ret = 0;
end:
if (ret != 0)
ERR_print_errors(bio_err);
end2:
BIO_free(in);
BIO_free_all(out);
DSA_free(dsa);
release_engine(e);
OPENSSL_free(passout);
return ret;
}