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/* $OpenBSD: genpkey.c,v 1.3 2014/08/28 14:25:48 jsing Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2006
 */
/* ====================================================================
 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
 *
 * 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 above 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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

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

#include "apps.h"

#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/pem.h>

#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif

static int
init_keygen_file(BIO * err, EVP_PKEY_CTX ** pctx, const char *file,
    ENGINE * e);
static int genpkey_cb(EVP_PKEY_CTX * ctx);


int genpkey_main(int, char **);

int
genpkey_main(int argc, char **argv)
{
	ENGINE *e = NULL;
	char **args, *outfile = NULL;
	char *passarg = NULL;
	BIO *in = NULL, *out = NULL;
	const EVP_CIPHER *cipher = NULL;
	int outformat;
	int text = 0;
	EVP_PKEY *pkey = NULL;
	EVP_PKEY_CTX *ctx = NULL;
	char *pass = NULL;
	int badarg = 0;
	int ret = 1, rv;

	int do_param = 0;

	outformat = FORMAT_PEM;

	args = argv + 1;
	while (!badarg && *args && *args[0] == '-') {
		if (!strcmp(*args, "-outform")) {
			if (args[1]) {
				args++;
				outformat = str2fmt(*args);
			} else
				badarg = 1;
		} else if (!strcmp(*args, "-pass")) {
			if (!args[1])
				goto bad;
			passarg = *(++args);
		}
#ifndef OPENSSL_NO_ENGINE
		else if (strcmp(*args, "-engine") == 0) {
			if (!args[1])
				goto bad;
			e = setup_engine(bio_err, *(++args), 0);
		}
#endif
		else if (!strcmp(*args, "-paramfile")) {
			if (!args[1])
				goto bad;
			args++;
			if (do_param == 1)
				goto bad;
			if (!init_keygen_file(bio_err, &ctx, *args, e))
				goto end;
		} else if (!strcmp(*args, "-out")) {
			if (args[1]) {
				args++;
				outfile = *args;
			} else
				badarg = 1;
		} else if (strcmp(*args, "-algorithm") == 0) {
			if (!args[1])
				goto bad;
			if (!init_gen_str(bio_err, &ctx, *(++args), e, do_param))
				goto end;
		} else if (strcmp(*args, "-pkeyopt") == 0) {
			if (!args[1])
				goto bad;
			if (!ctx) {
				BIO_puts(bio_err, "No keytype specified\n");
				goto bad;
			} else if (pkey_ctrl_string(ctx, *(++args)) <= 0) {
				BIO_puts(bio_err, "parameter setting error\n");
				ERR_print_errors(bio_err);
				goto end;
			}
		} else if (strcmp(*args, "-genparam") == 0) {
			if (ctx)
				goto bad;
			do_param = 1;
		} else if (strcmp(*args, "-text") == 0)
			text = 1;
		else {
			cipher = EVP_get_cipherbyname(*args + 1);
			if (!cipher) {
				BIO_printf(bio_err, "Unknown cipher %s\n",
				    *args + 1);
				badarg = 1;
			}
			if (do_param == 1)
				badarg = 1;
		}
		args++;
	}

	if (!ctx)
		badarg = 1;

	if (badarg) {
bad:
		BIO_printf(bio_err, "Usage: genpkey [options]\n");
		BIO_printf(bio_err, "where options may be\n");
		BIO_printf(bio_err, "-out file          output file\n");
		BIO_printf(bio_err, "-outform X         output format (DER or PEM)\n");
		BIO_printf(bio_err, "-pass arg          output file pass phrase source\n");
		BIO_printf(bio_err, "-<cipher>          use cipher <cipher> to encrypt the key\n");
#ifndef OPENSSL_NO_ENGINE
		BIO_printf(bio_err, "-engine e          use engine e, possibly a hardware device.\n");
#endif
		BIO_printf(bio_err, "-paramfile file    parameters file\n");
		BIO_printf(bio_err, "-algorithm alg     the public key algorithm\n");
		BIO_printf(bio_err, "-pkeyopt opt:value set the public key algorithm option <opt>\n"
		    "                   to value <value>\n");
		BIO_printf(bio_err, "-genparam          generate parameters, not key\n");
		BIO_printf(bio_err, "-text              print the in text\n");
		BIO_printf(bio_err, "NB: options order may be important!  See the manual page.\n");
		goto end;
	}
	if (!app_passwd(bio_err, passarg, NULL, &pass, NULL)) {
		BIO_puts(bio_err, "Error getting password\n");
		goto end;
	}
	if (outfile) {
		if (!(out = BIO_new_file(outfile, "wb"))) {
			BIO_printf(bio_err,
			    "Can't open output file %s\n", outfile);
			goto end;
		}
	} else {
		out = BIO_new_fp(stdout, BIO_NOCLOSE);
	}

	EVP_PKEY_CTX_set_cb(ctx, genpkey_cb);
	EVP_PKEY_CTX_set_app_data(ctx, bio_err);

	if (do_param) {
		if (EVP_PKEY_paramgen(ctx, &pkey) <= 0) {
			BIO_puts(bio_err, "Error generating parameters\n");
			ERR_print_errors(bio_err);
			goto end;
		}
	} else {
		if (EVP_PKEY_keygen(ctx, &pkey) <= 0) {
			BIO_puts(bio_err, "Error generating key\n");
			ERR_print_errors(bio_err);
			goto end;
		}
	}

	if (do_param)
		rv = PEM_write_bio_Parameters(out, pkey);
	else if (outformat == FORMAT_PEM)
		rv = PEM_write_bio_PrivateKey(out, pkey, cipher, NULL, 0,
		    NULL, pass);
	else if (outformat == FORMAT_ASN1)
		rv = i2d_PrivateKey_bio(out, pkey);
	else {
		BIO_printf(bio_err, "Bad format specified for key\n");
		goto end;
	}

	if (rv <= 0) {
		BIO_puts(bio_err, "Error writing key\n");
		ERR_print_errors(bio_err);
	}
	if (text) {
		if (do_param)
			rv = EVP_PKEY_print_params(out, pkey, 0, NULL);
		else
			rv = EVP_PKEY_print_private(out, pkey, 0, NULL);

		if (rv <= 0) {
			BIO_puts(bio_err, "Error printing key\n");
			ERR_print_errors(bio_err);
		}
	}
	ret = 0;

end:
	if (pkey)
		EVP_PKEY_free(pkey);
	if (ctx)
		EVP_PKEY_CTX_free(ctx);
	if (out)
		BIO_free_all(out);
	BIO_free(in);
	free(pass);

	return ret;
}

static int
init_keygen_file(BIO * err, EVP_PKEY_CTX ** pctx,
    const char *file, ENGINE * e)
{
	BIO *pbio;
	EVP_PKEY *pkey = NULL;
	EVP_PKEY_CTX *ctx = NULL;
	if (*pctx) {
		BIO_puts(err, "Parameters already set!\n");
		return 0;
	}
	pbio = BIO_new_file(file, "r");
	if (!pbio) {
		BIO_printf(err, "Can't open parameter file %s\n", file);
		return 0;
	}
	pkey = PEM_read_bio_Parameters(pbio, NULL);
	BIO_free(pbio);

	if (!pkey) {
		BIO_printf(bio_err, "Error reading parameter file %s\n", file);
		return 0;
	}
	ctx = EVP_PKEY_CTX_new(pkey, e);
	if (!ctx)
		goto err;
	if (EVP_PKEY_keygen_init(ctx) <= 0)
		goto err;
	EVP_PKEY_free(pkey);
	*pctx = ctx;
	return 1;

err:
	BIO_puts(err, "Error initializing context\n");
	ERR_print_errors(err);
	if (ctx)
		EVP_PKEY_CTX_free(ctx);
	if (pkey)
		EVP_PKEY_free(pkey);
	return 0;

}

int
init_gen_str(BIO * err, EVP_PKEY_CTX ** pctx,
    const char *algname, ENGINE * e, int do_param)
{
	EVP_PKEY_CTX *ctx = NULL;
	const EVP_PKEY_ASN1_METHOD *ameth;
	ENGINE *tmpeng = NULL;
	int pkey_id;

	if (*pctx) {
		BIO_puts(err, "Algorithm already set!\n");
		return 0;
	}
	ameth = EVP_PKEY_asn1_find_str(&tmpeng, algname, -1);

#ifndef OPENSSL_NO_ENGINE
	if (!ameth && e)
		ameth = ENGINE_get_pkey_asn1_meth_str(e, algname, -1);
#endif

	if (!ameth) {
		BIO_printf(bio_err, "Algorithm %s not found\n", algname);
		return 0;
	}
	ERR_clear_error();

	EVP_PKEY_asn1_get0_info(&pkey_id, NULL, NULL, NULL, NULL, ameth);
#ifndef OPENSSL_NO_ENGINE
	if (tmpeng)
		ENGINE_finish(tmpeng);
#endif
	ctx = EVP_PKEY_CTX_new_id(pkey_id, e);

	if (!ctx)
		goto err;
	if (do_param) {
		if (EVP_PKEY_paramgen_init(ctx) <= 0)
			goto err;
	} else {
		if (EVP_PKEY_keygen_init(ctx) <= 0)
			goto err;
	}

	*pctx = ctx;
	return 1;

err:
	BIO_printf(err, "Error initializing %s context\n", algname);
	ERR_print_errors(err);
	if (ctx)
		EVP_PKEY_CTX_free(ctx);
	return 0;

}

static int
genpkey_cb(EVP_PKEY_CTX * ctx)
{
	char c = '*';
	BIO *b = EVP_PKEY_CTX_get_app_data(ctx);
	int p;
	p = EVP_PKEY_CTX_get_keygen_info(ctx, 0);
	if (p == 0)
		c = '.';
	if (p == 1)
		c = '+';
	if (p == 2)
		c = '*';
	if (p == 3)
		c = '\n';
	BIO_write(b, &c, 1);
	(void) BIO_flush(b);
	return 1;
}