/* apps/genrsa.c */
/* 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.]
 */

#ifndef OPENSSL_NO_RSA
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "apps.h"
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/bn.h>
#include <openssl/rsa.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/rand.h>

#define DEFBITS	512
#undef PROG
#define PROG genrsa_main

static void MS_CALLBACK genrsa_cb(int p, int n, void *arg);

int MAIN(int, char **);

int MAIN(int argc, char **argv)
	{
#ifndef OPENSSL_NO_ENGINE
	ENGINE *e = NULL;
#endif
	int ret=1;
	RSA *rsa=NULL;
	int i,num=DEFBITS;
	long l;
#ifdef OPENSSL_FIPS
	int use_x931 = 0;
#endif
	const EVP_CIPHER *enc=NULL;
	unsigned long f4=RSA_F4;
	char *outfile=NULL;
	char *passargout = NULL, *passout = NULL;
#ifndef OPENSSL_NO_ENGINE
	char *engine=NULL;
#endif
	char *inrand=NULL;
	BIO *out=NULL;

	apps_startup();

	if (bio_err == NULL)
		if ((bio_err=BIO_new(BIO_s_file())) != NULL)
			BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);

	if (!load_config(bio_err, NULL))
		goto err;
	if ((out=BIO_new(BIO_s_file())) == NULL)
		{
		BIO_printf(bio_err,"unable to create BIO for output\n");
		goto err;
		}

	argv++;
	argc--;
	for (;;)
		{
		if (argc <= 0) break;
		if (strcmp(*argv,"-out") == 0)
			{
			if (--argc < 1) goto bad;
			outfile= *(++argv);
			}
		else if (strcmp(*argv,"-3") == 0)
			f4=3;
		else if (strcmp(*argv,"-F4") == 0 || strcmp(*argv,"-f4") == 0)
			f4=RSA_F4;
#ifdef OPENSSL_FIPS
		else if (strcmp(*argv,"-x931") == 0)
			use_x931 = 1;
#endif
#ifndef OPENSSL_NO_ENGINE
		else if (strcmp(*argv,"-engine") == 0)
			{
			if (--argc < 1) goto bad;
			engine= *(++argv);
			}
#endif
		else if (strcmp(*argv,"-rand") == 0)
			{
			if (--argc < 1) goto bad;
			inrand= *(++argv);
			}
#ifndef OPENSSL_NO_DES
		else if (strcmp(*argv,"-des") == 0)
			enc=EVP_des_cbc();
		else if (strcmp(*argv,"-des3") == 0)
			enc=EVP_des_ede3_cbc();
#endif
#ifndef OPENSSL_NO_IDEA
		else if (strcmp(*argv,"-idea") == 0)
			enc=EVP_idea_cbc();
#endif
#ifndef OPENSSL_NO_AES
		else if (strcmp(*argv,"-aes128") == 0)
			enc=EVP_aes_128_cbc();
		else if (strcmp(*argv,"-aes192") == 0)
			enc=EVP_aes_192_cbc();
		else if (strcmp(*argv,"-aes256") == 0)
			enc=EVP_aes_256_cbc();
#endif
		else if (strcmp(*argv,"-passout") == 0)
			{
			if (--argc < 1) goto bad;
			passargout= *(++argv);
			}
		else
			break;
		argv++;
		argc--;
		}
	if ((argc >= 1) && ((sscanf(*argv,"%d",&num) == 0) || (num < 0)))
		{
bad:
		BIO_printf(bio_err,"usage: genrsa [args] [numbits]\n");
		BIO_printf(bio_err," -des            encrypt the generated key with DES in cbc mode\n");
		BIO_printf(bio_err," -des3           encrypt the generated key with DES in ede cbc mode (168 bit key)\n");
#ifndef OPENSSL_NO_IDEA
		BIO_printf(bio_err," -idea           encrypt the generated key with IDEA in cbc mode\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
		BIO_printf(bio_err," -out file       output the key to 'file\n");
		BIO_printf(bio_err," -passout arg    output file pass phrase source\n");
		BIO_printf(bio_err," -f4             use F4 (0x10001) for the E value\n");
		BIO_printf(bio_err," -3              use 3 for the E value\n");
#ifndef OPENSSL_NO_ENGINE
		BIO_printf(bio_err," -engine e       use engine e, possibly a hardware device.\n");
#endif
		BIO_printf(bio_err," -rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
		BIO_printf(bio_err,"                 load the file (or the files in the directory) into\n");
		BIO_printf(bio_err,"                 the random number generator\n");
		goto err;
		}
		
	ERR_load_crypto_strings();

	if(!app_passwd(bio_err, NULL, passargout, NULL, &passout)) {
		BIO_printf(bio_err, "Error getting password\n");
		goto err;
	}

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

	if (outfile == NULL)
		{
		BIO_set_fp(out,stdout,BIO_NOCLOSE);
#ifdef OPENSSL_SYS_VMS
		{
		BIO *tmpbio = BIO_new(BIO_f_linebuffer());
		out = BIO_push(tmpbio, out);
		}
#endif
		}
	else
		{
		if (BIO_write_filename(out,outfile) <= 0)
			{
			perror(outfile);
			goto err;
			}
		}

	if (!app_RAND_load_file(NULL, bio_err, 1) && inrand == NULL
		&& !RAND_status())
		{
		BIO_printf(bio_err,"warning, not much extra random data, consider using the -rand option\n");
		}
	if (inrand != NULL)
		BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
			app_RAND_load_files(inrand));

	BIO_printf(bio_err,"Generating RSA private key, %d bit long modulus\n",
		num);
#ifdef OPENSSL_FIPS
	if (use_x931)
		{
		BIGNUM *pubexp;
		pubexp = BN_new();
		BN_set_word(pubexp, f4);
		rsa = RSA_X931_generate_key(num, pubexp, genrsa_cb, bio_err);
		BN_free(pubexp);
		}
	else
#endif
		rsa=RSA_generate_key(num,f4,genrsa_cb,bio_err);
		
	app_RAND_write_file(NULL, bio_err);

	if (rsa == NULL)
		{
		BIO_printf(bio_err, "Key Generation error\n");

		goto err;
		}
	
	/* We need to do the following for when the base number size is <
	 * long, esp windows 3.1 :-(. */
	l=0L;
	for (i=0; i<rsa->e->top; i++)
		{
#ifndef SIXTY_FOUR_BIT
		l<<=BN_BITS4;
		l<<=BN_BITS4;
#endif
		l+=rsa->e->d[i];
		}
	BIO_printf(bio_err,"e is %ld (0x%lX)\n",l,l);
	{
	PW_CB_DATA cb_data;
	cb_data.password = passout;
	cb_data.prompt_info = outfile;
	if (!PEM_write_bio_RSAPrivateKey(out,rsa,enc,NULL,0,
		(pem_password_cb *)password_callback,&cb_data))
		goto err;
	}

	ret=0;
err:
	if (rsa != NULL) RSA_free(rsa);
	if (out != NULL) BIO_free_all(out);
	if(passout) OPENSSL_free(passout);
	if (ret != 0)
		ERR_print_errors(bio_err);
	apps_shutdown();
	OPENSSL_EXIT(ret);
	}

static void MS_CALLBACK genrsa_cb(int p, int n, void *arg)
	{
	char c='*';

	if (p == 0) c='.';
	if (p == 1) c='+';
	if (p == 2) c='*';
	if (p == 3) c='\n';
	BIO_write((BIO *)arg,&c,1);
	(void)BIO_flush((BIO *)arg);
#ifdef LINT
	p=n;
#endif
	}
#else /* !OPENSSL_NO_RSA */

# if PEDANTIC
static void *dummy=&dummy;
# endif

#endif
