else if(!strcmp(*argv, "-x931")) pad = RSA_X931_PADDING;
int MAIN(int argc, char **argv){	ENGINE *e = NULL;	BIO *in = NULL, *out = NULL;	char *infile = NULL, *outfile = NULL;#ifndef OPENSSL_NO_ENGINE	char *engine = NULL;#endif	char *keyfile = NULL;	char rsa_mode = RSA_VERIFY, key_type = KEY_PRIVKEY;	int keyform = FORMAT_PEM;	char need_priv = 0, badarg = 0, rev = 0;	char hexdump = 0, asn1parse = 0;	X509 *x;	EVP_PKEY *pkey = NULL;	RSA *rsa = NULL;	unsigned char *rsa_in = NULL, *rsa_out = NULL, pad;	char *passargin = NULL, *passin = NULL;	int rsa_inlen, rsa_outlen = 0;	int keysize;	int ret = 1;	argc--;	argv++;	if(!bio_err) bio_err = BIO_new_fp(stderr, BIO_NOCLOSE);	if (!load_config(bio_err, NULL))		goto end;	ERR_load_crypto_strings();	OpenSSL_add_all_algorithms();	pad = RSA_PKCS1_PADDING;		while(argc >= 1)	{		if (!strcmp(*argv,"-in")) {			if (--argc < 1) badarg = 1;                        infile= *(++argv);		} else if (!strcmp(*argv,"-out")) {			if (--argc < 1) badarg = 1;			outfile= *(++argv);		} else if(!strcmp(*argv, "-inkey")) {			if (--argc < 1) badarg = 1;			keyfile = *(++argv);		} else if (!strcmp(*argv,"-passin")) {			if (--argc < 1) badarg = 1;			passargin= *(++argv);		} else if (strcmp(*argv,"-keyform") == 0) {			if (--argc < 1) badarg = 1;			keyform=str2fmt(*(++argv));#ifndef OPENSSL_NO_ENGINE		} else if(!strcmp(*argv, "-engine")) {			if (--argc < 1) badarg = 1;			engine = *(++argv);#endif		} else if(!strcmp(*argv, "-pubin")) {			key_type = KEY_PUBKEY;		} else if(!strcmp(*argv, "-certin")) {			key_type = KEY_CERT;		} 		else if(!strcmp(*argv, "-asn1parse")) asn1parse = 1;		else if(!strcmp(*argv, "-hexdump")) hexdump = 1;		else if(!strcmp(*argv, "-raw")) pad = RSA_NO_PADDING;		else if(!strcmp(*argv, "-oaep")) pad = RSA_PKCS1_OAEP_PADDING;		else if(!strcmp(*argv, "-ssl")) pad = RSA_SSLV23_PADDING;		else if(!strcmp(*argv, "-pkcs")) pad = RSA_PKCS1_PADDING;		else if(!strcmp(*argv, "-sign")) {			rsa_mode = RSA_SIGN;			need_priv = 1;		} else if(!strcmp(*argv, "-verify")) rsa_mode = RSA_VERIFY;		else if(!strcmp(*argv, "-rev")) rev = 1;		else if(!strcmp(*argv, "-encrypt")) rsa_mode = RSA_ENCRYPT;		else if(!strcmp(*argv, "-decrypt")) {			rsa_mode = RSA_DECRYPT;			need_priv = 1;		} else badarg = 1;		if(badarg) {			usage();			goto end;		}		argc--;		argv++;	}	if(need_priv && (key_type != KEY_PRIVKEY)) {		BIO_printf(bio_err, "A private key is needed for this operation\n");		goto end;	}#ifndef OPENSSL_NO_ENGINE        e = setup_engine(bio_err, engine, 0);#endif	if(!app_passwd(bio_err, passargin, NULL, &passin, NULL)) {		BIO_printf(bio_err, "Error getting password\n");		goto end;	}/* FIXME: seed PRNG only if needed */	app_RAND_load_file(NULL, bio_err, 0);		switch(key_type) {		case KEY_PRIVKEY:		pkey = load_key(bio_err, keyfile, keyform, 0,			passin, e, "Private Key");		break;		case KEY_PUBKEY:		pkey = load_pubkey(bio_err, keyfile, keyform, 0,			NULL, e, "Public Key");		break;		case KEY_CERT:		x = load_cert(bio_err, keyfile, keyform,			NULL, e, "Certificate");		if(x) {			pkey = X509_get_pubkey(x);			X509_free(x);		}		break;	}	if(!pkey) {		return 1;	}	rsa = EVP_PKEY_get1_RSA(pkey);	EVP_PKEY_free(pkey);	if(!rsa) {		BIO_printf(bio_err, "Error getting RSA key\n");		ERR_print_errors(bio_err);		goto end;	}	if(infile) {		if(!(in = BIO_new_file(infile, "rb"))) {			BIO_printf(bio_err, "Error Reading Input File\n");			ERR_print_errors(bio_err);				goto end;		}	} else in = BIO_new_fp(stdin, BIO_NOCLOSE);	if(outfile) {		if(!(out = BIO_new_file(outfile, "wb"))) {			BIO_printf(bio_err, "Error Reading Output File\n");			ERR_print_errors(bio_err);				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	}	keysize = RSA_size(rsa);	rsa_in = OPENSSL_malloc(keysize * 2);	rsa_out = OPENSSL_malloc(keysize);	/* Read the input data */	rsa_inlen = BIO_read(in, rsa_in, keysize * 2);	if(rsa_inlen <= 0) {		BIO_printf(bio_err, "Error reading input Data\n");		exit(1);	}	if(rev) {		int i;		unsigned char ctmp;		for(i = 0; i < rsa_inlen/2; i++) {			ctmp = rsa_in[i];			rsa_in[i] = rsa_in[rsa_inlen - 1 - i];			rsa_in[rsa_inlen - 1 - i] = ctmp;		}	}	switch(rsa_mode) {		case RSA_VERIFY:			rsa_outlen  = RSA_public_decrypt(rsa_inlen, rsa_in, rsa_out, rsa, pad);		break;		case RSA_SIGN:			rsa_outlen  = RSA_private_encrypt(rsa_inlen, rsa_in, rsa_out, rsa, pad);		break;		case RSA_ENCRYPT:			rsa_outlen  = RSA_public_encrypt(rsa_inlen, rsa_in, rsa_out, rsa, pad);		break;		case RSA_DECRYPT:			rsa_outlen  = RSA_private_decrypt(rsa_inlen, rsa_in, rsa_out, rsa, pad);		break;	}	if(rsa_outlen <= 0) {		BIO_printf(bio_err, "RSA operation error\n");		ERR_print_errors(bio_err);		goto end;	}	ret = 0;	if(asn1parse) {		if(!ASN1_parse_dump(out, rsa_out, rsa_outlen, 1, -1)) {			ERR_print_errors(bio_err);		}	} else if(hexdump) BIO_dump(out, (char *)rsa_out, rsa_outlen);	else BIO_write(out, rsa_out, rsa_outlen);	end:	RSA_free(rsa);	BIO_free(in);	BIO_free_all(out);	if(rsa_in) OPENSSL_free(rsa_in);	if(rsa_out) OPENSSL_free(rsa_out);	if(passin) OPENSSL_free(passin);	return ret;}