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openssl/apps/dsaparam.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/x509.h>
#include <openssl/pem.h>
static int verbose = 0;
static int gendsa_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_TEXT,
OPT_NOOUT, OPT_GENKEY, OPT_ENGINE, OPT_VERBOSE,
OPT_R_ENUM, OPT_PROV_ENUM
} OPTION_CHOICE;
const OPTIONS dsaparam_options[] = {
{OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits]\n"},
OPT_SECTION("General"),
{"help", OPT_HELP, '-', "Display this summary"},
#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 as text"},
{"noout", OPT_NOOUT, '-', "No output"},
{"verbose", OPT_VERBOSE, '-', "Verbose output"},
{"genkey", OPT_GENKEY, '-', "Generate a DSA key"},
OPT_R_OPTIONS,
OPT_PROV_OPTIONS,
OPT_PARAMETERS(),
{"numbits", 0, 0, "Number of bits if generating parameters (optional)"},
{NULL}
};
int dsaparam_main(int argc, char **argv)
{
ENGINE *e = NULL;
BIO *out = NULL;
EVP_PKEY *params = NULL, *pkey = NULL;
EVP_PKEY_CTX *ctx = NULL;
int numbits = -1, num = 0, genkey = 0;
int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0;
int ret = 1, i, text = 0, private = 0;
char *infile = NULL, *outfile = NULL, *prog;
OPTION_CHOICE o;
prog = opt_init(argc, argv, dsaparam_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(dsaparam_options);
ret = 0;
goto end;
case OPT_INFORM:
if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
goto opthelp;
break;
case OPT_IN:
infile = opt_arg();
break;
case OPT_OUTFORM:
if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
goto opthelp;
break;
case OPT_OUT:
outfile = opt_arg();
break;
case OPT_ENGINE:
e = setup_engine(opt_arg(), 0);
break;
case OPT_TEXT:
text = 1;
break;
case OPT_GENKEY:
genkey = 1;
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_NOOUT:
noout = 1;
break;
case OPT_VERBOSE:
verbose = 1;
break;
}
}
/* Optional arg is bitsize. */
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();
/* generate a key */
numbits = num;
private = genkey ? 1 : 0;
out = bio_open_owner(outfile, outformat, private);
if (out == NULL)
goto end;
ctx = EVP_PKEY_CTX_new_from_name(NULL, "DSA", NULL);
if (ctx == NULL) {
BIO_printf(bio_err,
"Error, DSA parameter generation context allocation failed\n");
goto end;
}
if (numbits > 0) {
if (numbits > 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, numbits);
EVP_PKEY_CTX_set_cb(ctx, gendsa_cb);
EVP_PKEY_CTX_set_app_data(ctx, bio_err);
if (verbose) {
BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
num);
BIO_printf(bio_err, "This could take some time\n");
}
if (EVP_PKEY_paramgen_init(ctx) <= 0) {
BIO_printf(bio_err,
"Error, DSA key generation paramgen init failed\n");
goto end;
}
if (!EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, num)) {
BIO_printf(bio_err,
"Error, DSA key generation setting bit length failed\n");
goto end;
}
if (EVP_PKEY_paramgen(ctx, &params) <= 0) {
BIO_printf(bio_err, "Error, DSA key generation failed\n");
goto end;
}
} else {
params = load_keyparams(infile, 1, "DSA", "DSA parameters");
}
if (params == NULL) {
/* Error message should already have been displayed */
goto end;
}
if (text) {
EVP_PKEY_print_params(out, params, 0, NULL);
}
if (outformat == FORMAT_ASN1 && genkey)
noout = 1;
if (!noout) {
if (outformat == FORMAT_ASN1)
i = i2d_KeyParams_bio(out, params);
else
i = PEM_write_bio_Parameters(out, params);
if (!i) {
BIO_printf(bio_err, "Error, unable to write DSA parameters\n");
goto end;
}
}
if (genkey) {
EVP_PKEY_CTX_free(ctx);
ctx = EVP_PKEY_CTX_new(params, NULL);
if (ctx == NULL) {
BIO_printf(bio_err,
"Error, DSA key generation context allocation failed\n");
goto end;
}
if (!EVP_PKEY_keygen_init(ctx)) {
BIO_printf(bio_err,
"Error, unable to initialise for key generation\n");
goto end;
}
if (!EVP_PKEY_keygen(ctx, &pkey)) {
BIO_printf(bio_err, "Error, unable to generate key\n");
goto end;
}
assert(private);
if (outformat == FORMAT_ASN1)
i = i2d_PrivateKey_bio(out, pkey);
else
i = PEM_write_bio_PrivateKey(out, pkey, NULL, NULL, 0, NULL, NULL);
}
ret = 0;
end:
if (ret != 0)
ERR_print_errors(bio_err);
BIO_free_all(out);
EVP_PKEY_CTX_free(ctx);
EVP_PKEY_free(pkey);
EVP_PKEY_free(params);
release_engine(e);
return ret;
}
static int gendsa_cb(EVP_PKEY_CTX *ctx)
{
static const char symbols[] = ".+*\n";
int p;
char c;
BIO *b;
if (!verbose)
return 1;
b = EVP_PKEY_CTX_get_app_data(ctx);
p = EVP_PKEY_CTX_get_keygen_info(ctx, 0);
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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