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openssl_setup() calls SSL_load_error_strings(), which happens to call
ERR_load_crypto_strings() - as such, we do not need to call the same
function from most of the applications.

/* $OpenBSD: dsa.c,v 1.2 2014/08/28 14:23:52 jsing Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <openssl/opensslconf.h>	/* for OPENSSL_NO_DSA */


#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>

#include "apps.h"

#include <openssl/bio.h>
#include <openssl/bn.h>
#include <openssl/dsa.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/x509.h>

/* -inform arg	- input format - default PEM (one of DER, NET or PEM)
 * -outform arg - output format - default PEM
 * -in arg	- input file - default stdin
 * -out arg	- output file - default stdout
 * -des		- encrypt output if PEM format with DES in cbc mode
 * -des3	- encrypt output if PEM format
 * -idea	- encrypt output if PEM format
 * -aes128	- encrypt output if PEM format
 * -aes192	- encrypt output if PEM format
 * -aes256	- encrypt output if PEM format
 * -camellia128 - encrypt output if PEM format
 * -camellia192 - encrypt output if PEM format
 * -camellia256 - encrypt output if PEM format
 * -seed        - encrypt output if PEM format
 * -text	- print a text version
 * -modulus	- print the DSA public key
 */

int dsa_main(int, char **);

int
dsa_main(int argc, char **argv)
{
	ENGINE *e = NULL;
	int ret = 1;
	DSA *dsa = NULL;
	int i, badops = 0;
	const EVP_CIPHER *enc = NULL;
	BIO *in = NULL, *out = NULL;
	int informat, outformat, text = 0, noout = 0;
	int pubin = 0, pubout = 0;
	char *infile, *outfile, *prog;
#ifndef OPENSSL_NO_ENGINE
	char *engine;
#endif
	char *passargin = NULL, *passargout = NULL;
	char *passin = NULL, *passout = NULL;
	int modulus = 0;

	int pvk_encr = 2;

#ifndef OPENSSL_NO_ENGINE
	engine = NULL;
#endif
	infile = NULL;
	outfile = NULL;
	informat = FORMAT_PEM;
	outformat = FORMAT_PEM;

	prog = argv[0];
	argc--;
	argv++;
	while (argc >= 1) {
		if (strcmp(*argv, "-inform") == 0) {
			if (--argc < 1)
				goto bad;
			informat = str2fmt(*(++argv));
		} else if (strcmp(*argv, "-outform") == 0) {
			if (--argc < 1)
				goto bad;
			outformat = str2fmt(*(++argv));
		} else if (strcmp(*argv, "-in") == 0) {
			if (--argc < 1)
				goto bad;
			infile = *(++argv);
		} else if (strcmp(*argv, "-out") == 0) {
			if (--argc < 1)
				goto bad;
			outfile = *(++argv);
		} else if (strcmp(*argv, "-passin") == 0) {
			if (--argc < 1)
				goto bad;
			passargin = *(++argv);
		} else if (strcmp(*argv, "-passout") == 0) {
			if (--argc < 1)
				goto bad;
			passargout = *(++argv);
		}
#ifndef OPENSSL_NO_ENGINE
		else if (strcmp(*argv, "-engine") == 0) {
			if (--argc < 1)
				goto bad;
			engine = *(++argv);
		}
#endif
		else if (strcmp(*argv, "-pvk-strong") == 0)
			pvk_encr = 2;
		else if (strcmp(*argv, "-pvk-weak") == 0)
			pvk_encr = 1;
		else if (strcmp(*argv, "-pvk-none") == 0)
			pvk_encr = 0;
		else if (strcmp(*argv, "-noout") == 0)
			noout = 1;
		else if (strcmp(*argv, "-text") == 0)
			text = 1;
		else if (strcmp(*argv, "-modulus") == 0)
			modulus = 1;
		else if (strcmp(*argv, "-pubin") == 0)
			pubin = 1;
		else if (strcmp(*argv, "-pubout") == 0)
			pubout = 1;
		else if ((enc = EVP_get_cipherbyname(&(argv[0][1]))) == NULL) {
			BIO_printf(bio_err, "unknown option %s\n", *argv);
			badops = 1;
			break;
		}
		argc--;
		argv++;
	}

	if (badops) {
bad:
		BIO_printf(bio_err, "%s [options] <infile >outfile\n", prog);
		BIO_printf(bio_err, "where options are\n");
		BIO_printf(bio_err, " -inform arg     input format - DER or PEM\n");
		BIO_printf(bio_err, " -outform arg    output format - DER or PEM\n");
		BIO_printf(bio_err, " -in arg         input file\n");
		BIO_printf(bio_err, " -passin arg     input file pass phrase source\n");
		BIO_printf(bio_err, " -out arg        output file\n");
		BIO_printf(bio_err, " -passout arg    output file pass phrase source\n");
#ifndef OPENSSL_NO_ENGINE
		BIO_printf(bio_err, " -engine e       use engine e, possibly a hardware device.\n");
#endif
		BIO_printf(bio_err, " -des            encrypt PEM output with cbc des\n");
		BIO_printf(bio_err, " -des3           encrypt PEM output with ede cbc des using 168 bit key\n");
#ifndef OPENSSL_NO_IDEA
		BIO_printf(bio_err, " -idea           encrypt PEM output with cbc idea\n");
#endif
#ifndef OPENSSL_NO_AES
		BIO_printf(bio_err, " -aes128, -aes192, -aes256\n");
		BIO_printf(bio_err, "                 encrypt PEM output with cbc aes\n");
#endif
#ifndef OPENSSL_NO_CAMELLIA
		BIO_printf(bio_err, " -camellia128, -camellia192, -camellia256\n");
		BIO_printf(bio_err, "                 encrypt PEM output with cbc camellia\n");
#endif
		BIO_printf(bio_err, " -text           print the key in text\n");
		BIO_printf(bio_err, " -noout          don't print key out\n");
		BIO_printf(bio_err, " -modulus        print the DSA public value\n");
		goto end;
	}

#ifndef OPENSSL_NO_ENGINE
	e = setup_engine(bio_err, engine, 0);
#endif

	if (!app_passwd(bio_err, passargin, passargout, &passin, &passout)) {
		BIO_printf(bio_err, "Error getting passwords\n");
		goto end;
	}
	in = BIO_new(BIO_s_file());
	out = BIO_new(BIO_s_file());
	if ((in == NULL) || (out == NULL)) {
		ERR_print_errors(bio_err);
		goto end;
	}
	if (infile == NULL)
		BIO_set_fp(in, stdin, BIO_NOCLOSE);
	else {
		if (BIO_read_filename(in, infile) <= 0) {
			perror(infile);
			goto end;
		}
	}

	BIO_printf(bio_err, "read DSA key\n");

	{
		EVP_PKEY *pkey;

		if (pubin)
			pkey = load_pubkey(bio_err, infile, informat, 1,
			    passin, e, "Public Key");
		else
			pkey = load_key(bio_err, infile, informat, 1,
			    passin, e, "Private Key");

		if (pkey) {
			dsa = EVP_PKEY_get1_DSA(pkey);
			EVP_PKEY_free(pkey);
		}
	}
	if (dsa == NULL) {
		BIO_printf(bio_err, "unable to load Key\n");
		ERR_print_errors(bio_err);
		goto end;
	}
	if (outfile == NULL) {
		BIO_set_fp(out, stdout, BIO_NOCLOSE);
	} else {
		if (BIO_write_filename(out, outfile) <= 0) {
			perror(outfile);
			goto end;
		}
	}

	if (text) {
		if (!DSA_print(out, dsa, 0)) {
			perror(outfile);
			ERR_print_errors(bio_err);
			goto end;
		}
	}
	if (modulus) {
		fprintf(stdout, "Public Key=");
		BN_print(out, dsa->pub_key);
		fprintf(stdout, "\n");
	}
	if (noout)
		goto end;
	BIO_printf(bio_err, "writing DSA key\n");
	if (outformat == FORMAT_ASN1) {
		if (pubin || pubout)
			i = i2d_DSA_PUBKEY_bio(out, dsa);
		else
			i = i2d_DSAPrivateKey_bio(out, dsa);
	} else if (outformat == FORMAT_PEM) {
		if (pubin || pubout)
			i = PEM_write_bio_DSA_PUBKEY(out, dsa);
		else
			i = PEM_write_bio_DSAPrivateKey(out, dsa, enc,
			    NULL, 0, NULL, passout);
#if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_RC4)
	} else if (outformat == FORMAT_MSBLOB || outformat == FORMAT_PVK) {
		EVP_PKEY *pk;
		pk = EVP_PKEY_new();
		EVP_PKEY_set1_DSA(pk, dsa);
		if (outformat == FORMAT_PVK)
			i = i2b_PVK_bio(out, pk, pvk_encr, 0, passout);
		else if (pubin || pubout)
			i = i2b_PublicKey_bio(out, pk);
		else
			i = i2b_PrivateKey_bio(out, pk);
		EVP_PKEY_free(pk);
#endif
	} else {
		BIO_printf(bio_err, "bad output format specified for outfile\n");
		goto end;
	}
	if (i <= 0) {
		BIO_printf(bio_err, "unable to write private key\n");
		ERR_print_errors(bio_err);
	} else
		ret = 0;
end:
	BIO_free(in);
	if (out != NULL)
		BIO_free_all(out);
	if (dsa != NULL)
		DSA_free(dsa);
	free(passin);
	free(passout);

	return (ret);
}