#define F2N(key, dsp) \
	(((key) == NULL) ? (char *) NULL : \
		Tcl_TranslateFileName(interp, (key), (dsp)))

static SSL_CTX *CTX_Init(State *statePtr, int isServer, int proto, char *key,
		char *certfile, unsigned char *key_asn1, unsigned char *cert_asn1,
		Tcl_Size key_asn1_len, Tcl_Size cert_asn1_len, char *CApath, char *CAfile,
		char *ciphers, char *ciphersuites, int level, char *DHparams);
		Tcl_Size key_asn1_len, Tcl_Size cert_asn1_len, char *CApath, char *CAstore,
		char *CAfile, char *ciphers, char *ciphersuites, int level, char *DHparams);

#define TLS_PROTO_SSL2		0x01
#define TLS_PROTO_SSL3		0x02
#define TLS_PROTO_TLS1		0x04
#define TLS_PROTO_TLS1_1	0x08
#define TLS_PROTO_TLS1_2	0x10
#define TLS_PROTO_TLS1_3	0x20

    Tcl_Size key_len		= 0;
    unsigned char *cert		= NULL;
    Tcl_Size cert_len		= 0;
    char *ciphers		= NULL;
    char *ciphersuites		= NULL;
    char *CAfile		= NULL;
    char *CApath		= NULL;
    char *CAstore		= NULL;
    char *DHparams		= NULL;
    char *model			= NULL;
    char *servername		= NULL;	/* hostname for Server Name Indication */
    char *session_id		= NULL;
    Tcl_Obj *alpn		= NULL;
    int ssl2 = 0, ssl3 = 0;
    int tls1 = 1, tls1_1 = 1, tls1_2 = 1, tls1_3 = 1;

	if (opt[0] != '-')
	    break;

	OPTOBJ("-alpn", alpn);
	OPTSTR("-cadir", CApath);
	OPTSTR("-cafile", CAfile);
	OPTSTR("-castore", CAstore);
	OPTBYTE("-cert", cert, cert_len);
	OPTSTR("-certfile", certfile);
	OPTSTR("-cipher", ciphers);
	OPTSTR("-ciphers", ciphers);
	OPTSTR("-ciphersuites", ciphersuites);
	OPTOBJ("-command", script);
	OPTSTR("-dhparams", DHparams);

	OPTBOOL("-tls1", tls1);
	OPTBOOL("-tls1.1", tls1_1);
	OPTBOOL("-tls1.2", tls1_2);
	OPTBOOL("-tls1.3", tls1_3);
	OPTOBJ("-validatecommand", vcmd);
	OPTOBJ("-vcmd", vcmd);

	OPTBAD("option", "-alpn, -cadir, -cafile, -cert, -certfile, -cipher, -ciphersuites, -command, -dhparams, -key, -keyfile, -model, -password, -post_handshake, -request, -require, -security_level, -server, -servername, -session_id, -ssl2, -ssl3, -tls1, -tls1.1, -tls1.2, -tls1.3, or -validatecommand");
	OPTBAD("option", "-alpn, -cadir, -cafile, -castore, -cert, -certfile, -cipher, -ciphersuites, -command, -dhparams, -key, -keyfile, -model, -password, -post_handshake, -request, -require, -security_level, -server, -servername, -session_id, -ssl2, -ssl3, -tls1, -tls1.1, -tls1.2, -tls1.3, or -validatecommand");

	return TCL_ERROR;
    }
    if (request)		verify |= SSL_VERIFY_CLIENT_ONCE | SSL_VERIFY_PEER;
    if (request && require)	verify |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
    if (request && post_handshake)	verify |= SSL_VERIFY_POST_HANDSHAKE;
    if (verify == 0)		verify = SSL_VERIFY_NONE;

    if (key && !*key)		        key	        = NULL;
    if (certfile && !*certfile)         certfile	= NULL;
    if (keyfile && !*keyfile)		keyfile	        = NULL;
    if (ciphers && !*ciphers)	        ciphers	        = NULL;
    if (ciphersuites && !*ciphersuites) ciphersuites    = NULL;
    if (CAfile && !*CAfile)	        CAfile	        = NULL;
    if (CApath && !*CApath)	        CApath	        = NULL;
    if (CAstore && !*CAstore)	        CAstore	        = NULL;
    if (DHparams && !*DHparams)	        DHparams        = NULL;

    /* new SSL state */
    statePtr		= (State *) ckalloc((unsigned) sizeof(State));
    memset(statePtr, 0, sizeof(State));

    statePtr->flags	= flags;

	    Tcl_SetErrorCode(interp, "TLS", "IMPORT", "CHANNEL", "INVALID", (char *) NULL);
	    Tls_Free((tls_free_type *) statePtr);
	    return TCL_ERROR;
	}
	ctx = ((State *)Tcl_GetChannelInstanceData(chan))->ctx;
    } else {
	if ((ctx = CTX_Init(statePtr, server, proto, keyfile, certfile, key, cert, key_len,
	    cert_len, CApath, CAfile, ciphers, ciphersuites, level, DHparams)) == NULL) {
	    cert_len, CApath, CAstore, CAfile, ciphers, ciphersuites, level, DHparams)) == NULL) {
	    Tls_Free((tls_free_type *) statePtr);
	    return TCL_ERROR;
	}
    }

    statePtr->ctx = ctx;

    }

    /*
     * SSL Callbacks
     */
    SSL_set_app_data(statePtr->ssl, (void *)statePtr);	/* point back to us */
    SSL_set_verify(statePtr->ssl, verify, VerifyCallback);
    /*SSL_set_verify_depth(SSL_set_verify_depth, 0);*/
    SSL_set_info_callback(statePtr->ssl, InfoCallback);

    /* Callback for observing protocol messages */
#ifndef OPENSSL_NO_SSL_TRACE
    /* void SSL_CTX_set_msg_callback_arg(statePtr->ctx, (void *)statePtr);
    void SSL_CTX_set_msg_callback(statePtr->ctx, MessageCallback); */
    SSL_set_msg_callback_arg(statePtr->ssl, (void *)statePtr);

 *	constructs SSL context (CTX)
 *
 *-------------------------------------------------------------------
 */
static SSL_CTX *
CTX_Init(State *statePtr, int isServer, int proto, char *keyfile, char *certfile,
    unsigned char *key, unsigned char *cert, Tcl_Size key_len, Tcl_Size cert_len, char *CApath,
    char *CAfile, char *ciphers, char *ciphersuites, int level, char *DHparams) {
    char *CAstore, char *CAfile, char *ciphers, char *ciphersuites, int level, char *DHparams) {
    Tcl_Interp *interp = statePtr->interp;
    SSL_CTX *ctx = NULL;
    Tcl_DString ds;
    int off = 0, abort = 0;
    int load_private_key;
    const SSL_METHOD *method;

	    Tcl_AppendResult(interp, "private key does not match the certificate public key",
			     (char *) NULL);
	    SSL_CTX_free(ctx);
	    return NULL;
	}
    }

    /* Set to use default location and file for Certificate Authority (CA) certificates. The
     * verify path and store can be overridden by the SSL_CERT_DIR env var. The verify file can
     * be overridden by the SSL_CERT_FILE env var. */
    /* Set to use the default location and file for Certificate Authority (CA) certificates.
     * The default CA certificates directory is called certs in the default OpenSSL
     * directory. It contains the CA certificates in PEM format, with one certificate per
     * file. The verify path and store can be overridden by the SSL_CERT_DIR env var. The
     * default CA certificates file is called cert.pem in the default OpenSSL directory.
     * The verify file can be overridden by the SSL_CERT_FILE env var. */
    if (!SSL_CTX_set_default_verify_paths(ctx)) {
	abort++;
    }

    /* Overrides for the CA verify path and file */
    {
#if OPENSSL_VERSION_NUMBER < 0x30000000L

	    if (certNames != NULL) {
		SSL_CTX_set_client_CA_list(ctx, certNames);
	    }
	    Tcl_DStringFree(&ds);
	}

#else
	/* Directory containing CA certificates in PEM format. */
	if (CApath != NULL) {
	    if (!SSL_CTX_load_verify_dir(ctx, F2N(CApath, &ds))) {
		abort++;
	    }
	    Tcl_DStringFree(&ds);
	}
	
	/* URI for to a store, which may be a single container or a catalog of containers. */
	if (CAstore != NULL) {
	    if (!SSL_CTX_load_verify_store(ctx, F2N(CAstore, &ds))) {
		abort++;
	    }
	    Tcl_DStringFree(&ds);
	}
	
	/* File of CA certificates in PEM format.  */
	if (CAfile != NULL) {
	    if (!SSL_CTX_load_verify_file(ctx, F2N(CAfile, &ds))) {
		abort++;
	    }
	    Tcl_DStringFree(&ds);

	    /* Set list of CAs to send to client when requesting a client certificate */

 */
void Tls_Clean(State *statePtr) {
    dprintf("Called");

    if (statePtr->ssl) {
	/* Send close_notify message */
	dprintf("SSL_shutdown(%p)", statePtr->ssl);
	/* Will return return 0 while shutdown in process, then 1 when complete */
	/* closes the write direction of the connection; the read direction is closed by the peer. */
	/* Does not affect socket */
	SSL_shutdown(statePtr->ssl);
    }

    /*
     * we're assuming here that we're single-threaded
     */
    if (statePtr->timer != (Tcl_TimerToken) NULL) {