/* apps/genpkey.c */
/* 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/pem.h>
#include <openssl/err.h>
#include <openssl/evp.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);

#define PROG genpkey_main

int MAIN(int, char **);

int 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;

	if (bio_err == NULL)
		bio_err = BIO_new_fp (stderr, BIO_NOCLOSE);

	if (!load_config(bio_err, NULL))
		goto end;

	outformat=FORMAT_PEM;

	ERR_load_crypto_strings();
	OpenSSL_add_all_algorithms();
	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);
#ifdef OPENSSL_SYS_VMS
			{
			BIO *tmpbio = BIO_new(BIO_f_linebuffer());
			out = BIO_push(tmpbio, out);
			}
#endif
		}

	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);
	if (pass)
		OPENSSL_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;
	}
