# stub library C source files to compile in TEA_ADD_STUB_SOURCES,
# and runtime Tcl library files in TEA_ADD_TCL_SOURCES.
# This defines PKG(_STUB)_SOURCES, PKG(_STUB)_OBJECTS, PKG_HEADERS
# and PKG_TCL_SOURCES.
#-----------------------------------------------------------------------


    vars="tls.c tlsBIO.c tlsIO.c tlsX509.c"
    for i in $vars; do
	case $i in
	    \$*)
		# allow $-var names
		PKG_SOURCES="$PKG_SOURCES $i"
		PKG_OBJECTS="$PKG_OBJECTS $i"
		;;

# public headers that need to be installed in TEA_ADD_HEADERS,
# stub library C source files to compile in TEA_ADD_STUB_SOURCES,
# and runtime Tcl library files in TEA_ADD_TCL_SOURCES.
# This defines PKG(_STUB)_SOURCES, PKG(_STUB)_OBJECTS, PKG_HEADERS
# and PKG_TCL_SOURCES.
#-----------------------------------------------------------------------

TEA_ADD_SOURCES([tls.c tlsBIO.c tlsIO.c tlsX509.c])
TEA_ADD_HEADERS([generic/tls.h])
TEA_ADD_INCLUDES([])
TEA_ADD_LIBS([])
TEA_ADD_CFLAGS([])
TEA_ADD_STUB_SOURCES([])
TEA_ADD_TCL_SOURCES([library/tls.tcl])

	    <dd><b>tls::socket</b> <em> ?-server command? ?options? port</em></dd>
	    <dd><b>tls::handshake</b> <em> channel</em></dd>
	    <dd><b>tls::status </b> <em>?-local? channel</em></dd>
	    <dd><b>tls::connection </b> <em>channel</em></dd>
	    <dd><b>tls::import</b> <em>channel ?options?</em></dd>
	    <dd><b>tls::unimport</b> <em>channel</em></dd>
	    <dt>&nbsp;</dt>

	    <dd><b>tls::ciphers </b> <em>protocol ?verbose? ?supported?</em></dd>


	    <dd><b>tls::protocols</b></dd>
	    <dd><b>tls::version</b></dd>









	</dl>
    </dd>
    <dd><a href="#COMMANDS">COMMANDS</a></dd>
    <dd><a href="#CALLBACK OPTIONS">CALLBACK OPTIONS</a></dd>
    <dd><a href="#HTTPS EXAMPLE">HTTPS EXAMPLE</a></dd>
    <dd><a href="#SEE ALSO">SPECIAL CONSIDERATIONS</a></dd>
    <dd><a href="#SEE ALSO">SEE ALSO</a></dd>
</dl>

<hr>

<h3><a name="NAME">NAME</a></h3>

<p><strong>tls</strong> - binding to <strong>OpenSSL</strong>
toolkit.</p>

<h3><a name="SYNOPSIS">SYNOPSIS</a></h3>

<p><b>package require Tcl 8.4</b><br>
<b>package require tls</b><br>
<br>
<a href="#tls::init"><b>tls::init</b> <i>?options?</i></a><br>
<a href="#tls::socket"><b>tls::socket</b> <i>?options? host port</i><br>
<a href="#tls::socket"><b>tls::socket</b> <i>?-server command? ?options? port</i></a><br>
<a href="#tls::status"><b>tls::status</b> <i>?-local? channel</i></a><br>
<a href="#tls::connection"><b>tls::connection</b> <i>channel</i></a><br>
<a href="#tls::handshake"><b>tls::handshake</b> <i>channel</i></a><br>
<a href="#tls::import"><b>tls::import</b> <i>channel ?options?</i></a><br>
<a href="#tls::unimport"><b>tls::unimport</b> <i>channel</i></a><br>
<br>

<a href="#tls::ciphers"><b>tls::ciphers</b> <i>protocol ?verbose? ?supported?</i></a><br>


<a href="#tls::protocols"><b>tls::protocols</b></a>
<a href="#tls::version"><b>tls::version</b></a>









</p>

<h3><a name="DESCRIPTION">DESCRIPTION</a></h3>

<p>This extension provides a generic binding to <a
href="http://www.openssl.org/">OpenSSL</a>, utilizing the
<strong>Tcl_StackChannel</strong>

	host port</em></a></dt>
    <dt><b>tls::socket</b><em> ?-server command? ?options? port</em></dt>
    <dd>This is a helper function that utilizes the underlying
	commands (<strong>tls::import</strong>). It behaves
	exactly the same as the native Tcl <strong>socket</strong>
	command except that the options can include any of the
	applicable <a href="#tls::import"><strong>tls:import</strong></a>
	options with one additional option:
<blockquote>
    <dl>
	<dt><strong>-autoservername</strong> <em>bool</em></dt>
	<dd>Automatically send the -servername as the <em>host</em> argument
	    (default is <em>false</em>)</dd>
    </dl>
</blockquote>

	<dt><strong>-request </strong><em>bool</em></dt>
	<dd>Request a certificate from peer during SSL handshake.
	    (default is <em>true</em>)</dd>
	<dt><strong>-require</strong> <em>bool</em></dt>
	<dd>Require a valid certificate from peer during SSL handshake.
	    If this is set to true, then <strong>-request</strong> must
	    also be set to true. (default is <em>false</em>)</dd>
	<dt><strong>-securitylevel</strong> <em>integer</em></dt>
	<dd>Set security level. Must be 0 to 5. The security level affects
	    cipher suite encryption algorithms, supported ECC curves,
	    supported signature algorithms, DH parameter sizes, certificate
	    key sizes and signature algorithms. The default is 1.
	    Level 3 and higher disable support for session tickets and only
	    accept cipher suites that provide forward secrecy.</dd>
	<dt><strong>-server</strong> <em>bool</em></dt>

    <dt><a name="tls::handshake"><strong>tls::handshake</strong> <em>channel</em></a></dt>
    <dd>Forces handshake to take place, and returns 0 if
	handshake is still in progress (non-blocking), or 1 if
	the handshake was successful. If the handshake failed
	this routine will throw an error.</dd>
    <dt>&nbsp;</dt>
    <dt><a name="tls::status"><strong>tls::status</strong>
    <em>?-local? channel</em></a></dt>
    <dd>Returns the current status of the certificate for an SSL
	channel. The result is a list of key-value pairs describing
	the certificate. If the result is an empty list then the
	SSL handshake has not yet completed. If <em>-local</em> is

	specified, then the local certificate is used.</dd>
<blockquote>
	<b>SSL Status</b>
    <dl>
	<dt><strong>alpn</strong> <em>protocol</em></dt>
	<dd>The protocol selected after Application-Layer Protocol
	    Negotiation (ALPN).</dd>

	<dt><strong>state</strong> <em>state</em></dt>
	<dd>State of the connection.</dd>
	<dt><strong>servername</strong> <em>name</em></dt>
	<dd>The name of the connected to server.</dd>
	<dt><strong>protocol</strong> <em>version</em></dt>
	<dd>The protocol version used for the connection:
	    SSL2, SSL3, TLS1, TLS1.1, TLS1.2, TLS1.3, or unknown.</dd>
	<dt><strong>renegotiation</strong> <em>boolean</em></dt>
	<dd>Whether protocol renegotiation is supported or not.</dd>
	<dt><strong>securitylevel</strong> <em>level</em></dt>
	<dd>The security level used for selection of ciphers, key size, etc.</dd>
	<dt><strong>session_reused</strong> <em>boolean</em></dt>
	<dd>Whether the session has been reused or not.</dd>
	<dt><strong>is_server</strong> <em>boolean</em></dt>
	<dd>Whether the connection is configured as a server (1) or client (0).</dd>
	<dt><strong>compression</strong> <em>mode</em></dt>
	<dd>Compression method.</dd>
	<dt><strong>expansion</strong> <em>mode</em></dt>
	<dd>Expansion method.</dd>


    </dl>
</blockquote>
<blockquote>
	<b>Cipher Info</b>
    <dl>
	<dt><strong>cipher</strong> <em>cipher</em></dt>
	<dd>The current cipher in use for the connection.</dd>
	<dt><strong>standard_name</strong> <em>name</em></dt>
	<dd>The standard RFC name of cipher.</dd>
	<dt><strong>bits</strong> <em>n</em></dt>
	<dd>The number of processed bits used for cipher.</dd>
	<dt><strong>secret_bits</strong> <em>n</em></dt>
	<dd>The number of secret bits used for cipher.</dd>
	<dt><strong>min_version</strong> <em>version</em></dt>
	<dd>The minimum protocol version for cipher.</dd>



	<dt><strong>id</strong> <em>id</em></dt>
	<dd>The OpenSSL cipher id.</dd>
	<dt><strong>description</strong> <em>string</em></dt>
	<dd>A text description of the cipher.</dd>


    </dl>
</blockquote>
<blockquote>
	<b>Session Info</b>
    <dl>
	<dt><strong>alpn</strong> <em>protocol</em></dt>
	<dd>The protocol selected after Application-Layer Protocol

	<dd>Unique session ticket application data.</dd>
	<dt><strong>master_key</strong> <em>binary_string</em></dt>
	<dd>Unique session master key.</dd>
	<dt><strong>session_cache_mode</strong> <em>mode</em></dt>
	<dd>Server cache mode (client, server, or both).</dd>
    </dl>
</blockquote>






    <dt><a name="tls::ciphers"><strong>tls::ciphers</strong>
    <em>protocol ?verbose? ?supported?</em></a></dt>
    <dd>Returns a list of supported ciphers available for <em>protocol</em>,

	where protocol must be one of <b>ssl2, ssl3, tls1, tls1.1,
	tls1.2,</b> or <b>tls1.3</b>. If <em>verbose</em> is specified as
	true then a verbose, human readable list is returned with
	additional information on the cipher. If <em>supported</em>
	is specified as true, then only the ciphers supported for protocol
	will be listed.</dd>











    <dt><a name="tls::protocols"><strong>tls::protocols</strong></a></dt>
    <dd>Returns a list of supported protocols. Valid values are:
	<b>ssl2</b>, <b>ssl3</b>, <b>tls1</b>, <b>tls1.1</b>, <b>tls1.2</b>,
	and <b>tls1.3</b>. Exact list depends on OpenSSL version and
	compile time flags.</dd>

    <dt><a name="tls::version"><strong>tls::version</strong></a></dt>
    <dd>Returns the OpenSSL version string.</dd>




















































































</dl>

<h3><a name="CALLBACK OPTIONS">CALLBACK OPTIONS</a></h3>

<p>
As indicated above, individual channels can be given their own callbacks
to handle intermediate processing by the OpenSSL library, using the

/*
 *  Copyright (C) 1997-2000 Matt Newman <matt@novadigm.com>
 *
 * Stylized option processing - requires consistent
 * external vars: opt, idx, objc, objv
 */

#ifndef _TCL_OPTS_H
#define _TCL_OPTS_H







#define OPT_PROLOG(option)			\
    if (strcmp(opt, (option)) == 0) {		\
	if (++idx >= objc) {			\
	    Tcl_AppendResult(interp,		\
		"no argument given for ",	\
		(option), " option",		\
		(char *) NULL);			\
	    return TCL_ERROR;			\
	}

#define OPT_POSTLOG()				\
	continue;				\
    }

#define OPTOBJ(option, var)			\
    OPT_PROLOG(option)				\
    var = objv[idx];				\
    OPT_POSTLOG()

#define OPTSTR(option, var)			\
    OPT_PROLOG(option)				\

    OPT_PROLOG(option)				\
    if (Tcl_GetBooleanFromObj(interp, objv[idx],\
	    &(var)) != TCL_OK) {		\
	    return TCL_ERROR;			\
    }						\
    OPT_POSTLOG()

#define OPTBYTE(option, var, lvar)			\
    OPT_PROLOG(option)				\
    var = Tcl_GetByteArrayFromObj(objv[idx], &(lvar));\
    OPT_POSTLOG()

#define OPTBAD(type, list)			\
    Tcl_AppendResult(interp, "bad ", (type),	\
		" \"", opt, "\": must be ",	\
		(list), (char *) NULL)

#endif /* _TCL_OPTS_H */

 *
 */

#include "tlsInt.h"
#include "tclOpts.h"
#include <stdio.h>
#include <stdlib.h>




#include <openssl/rsa.h>
#include <openssl/safestack.h>

/* Min OpenSSL version */
#if OPENSSL_VERSION_NUMBER < 0x10101000L
#error "Only OpenSSL v1.1.1 or later is supported"
#endif

/*
 * External functions
 */

/*
 * Forward declarations
 */

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

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

static int	TlsLibInit(int uninitialize);

    cmdPtr = Tcl_DuplicateObj(statePtr->callback);
    Tcl_ListObjAppendElement(interp, cmdPtr, Tcl_NewStringObj("error", -1));
    Tcl_ListObjAppendElement(interp, cmdPtr,
	    Tcl_NewStringObj(Tcl_GetChannelName(statePtr->self), -1));
    if (msg != NULL) {
	Tcl_ListObjAppendElement(interp, cmdPtr, Tcl_NewStringObj(msg, -1));

    } else if ((msg = Tcl_GetStringFromObj(Tcl_GetObjResult(interp), (Tcl_Size *)NULL)) != NULL) {
	Tcl_ListObjAppendElement(interp, cmdPtr, Tcl_NewStringObj(msg, -1));

    } else {
	listPtr = Tcl_NewListObj(0, NULL);
	while ((err = ERR_get_error()) != 0) {
	    Tcl_ListObjAppendElement(interp, listPtr, Tcl_NewStringObj(ERR_reason_error_string(err), -1));
	}

    }
    Tcl_DecrRefCount(cmdPtr);

    Tcl_Release((ClientData) statePtr);

    /* If successful, pass back password string and truncate if too long */
    if (code == TCL_OK) {
	Tcl_Size len;
	char *ret = (char *) Tcl_GetStringFromObj(Tcl_GetObjResult(interp), &len);
	if (len > (Tcl_Size) size-1) {
	    len = (Tcl_Size) size-1;
	}
	strncpy(buf, ret, (size_t) len);
	buf[len] = '\0';
	Tcl_Release((ClientData) interp);
	return((int) len);
    }
    Tcl_Release((ClientData) interp);
    return -1;
}

/*
 *-------------------------------------------------------------------

    cmdPtr = Tcl_DuplicateObj(statePtr->callback);
    Tcl_ListObjAppendElement(interp, cmdPtr, Tcl_NewStringObj("session", -1));
    Tcl_ListObjAppendElement(interp, cmdPtr,
	    Tcl_NewStringObj(Tcl_GetChannelName(statePtr->self), -1));

    /* Session id */
    session_id = SSL_SESSION_get_id(session, &ulen);
    Tcl_ListObjAppendElement(interp, cmdPtr, Tcl_NewByteArrayObj(session_id, (Tcl_Size) ulen));

    /* Session ticket */
    SSL_SESSION_get0_ticket(session, &ticket, &len2);
    Tcl_ListObjAppendElement(interp, cmdPtr, Tcl_NewByteArrayObj(ticket, (Tcl_Size) len2));

    /* Lifetime - number of seconds */
    Tcl_ListObjAppendElement(interp, cmdPtr,
	Tcl_NewLongObj((long) SSL_SESSION_get_ticket_lifetime_hint(session)));

    /* Eval callback command */
    Tcl_IncrRefCount(cmdPtr);

    servername = (const char *)p;

    /* Create command to eval */
    cmdPtr = Tcl_DuplicateObj(statePtr->vcmd);
    Tcl_ListObjAppendElement(interp, cmdPtr, Tcl_NewStringObj("hello", -1));
    Tcl_ListObjAppendElement(interp, cmdPtr,
	    Tcl_NewStringObj(Tcl_GetChannelName(statePtr->self), -1));
    Tcl_ListObjAppendElement(interp, cmdPtr, Tcl_NewStringObj(servername, (Tcl_Size) len));

    /* Eval callback command */
    Tcl_IncrRefCount(cmdPtr);
    if ((code = EvalCallback(interp, statePtr, cmdPtr)) > 1) {
	res = SSL_CLIENT_HELLO_RETRY;
	*alert = SSL_R_TLSV1_ALERT_USER_CANCELLED;
    } else if (code == 1) {
	res = SSL_CLIENT_HELLO_SUCCESS;
    } else {
	res = SSL_CLIENT_HELLO_ERROR;
	*alert = SSL_R_TLSV1_ALERT_INTERNAL_ERROR;
    }
    Tcl_DecrRefCount(cmdPtr);
    return res;
}

/********************/
/* Commands         */
/********************/

/*
 *-------------------------------------------------------------------
 *
 * CiphersObjCmd -- list available ciphers
 *
 *	This procedure is invoked to process the "tls::ciphers" command
 *	to list available ciphers, based upon protocol selected.
 *
 * Results:
 *	A standard Tcl result list.
 *
 * Side effects:
 *	constructs and destroys SSL context (CTX)
 *
 *-------------------------------------------------------------------
 */
static const char *protocols[] = {
	"ssl2", "ssl3", "tls1", "tls1.1", "tls1.2", "tls1.3", NULL
};
enum protocol {
    TLS_SSL2, TLS_SSL3, TLS_TLS1, TLS_TLS1_1, TLS_TLS1_2, TLS_TLS1_3, TLS_NONE
};

static int
CiphersObjCmd(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
    Tcl_Obj *objPtr = NULL;
    SSL_CTX *ctx = NULL;
    SSL *ssl = NULL;
    STACK_OF(SSL_CIPHER) *sk;
    char *cp, buf[BUFSIZ];
    int index, verbose = 0, use_supported = 0;
    const SSL_METHOD *method;

    dprintf("Called");

    if ((objc < 2) || (objc > 4)) {
	Tcl_WrongNumArgs(interp, 1, objv, "protocol ?verbose? ?supported?");
	return TCL_ERROR;
    }
    if (Tcl_GetIndexFromObj(interp, objv[1], protocols, "protocol", 0, &index) != TCL_OK) {
	return TCL_ERROR;
    }
    if ((objc > 2) && Tcl_GetBooleanFromObj(interp, objv[2], &verbose) != TCL_OK) {
	return TCL_ERROR;
    }
    if ((objc > 3) && Tcl_GetBooleanFromObj(interp, objv[3], &use_supported) != TCL_OK) {
	return TCL_ERROR;
    }

    ERR_clear_error();

    switch ((enum protocol)index) {
	case TLS_SSL2:
#if OPENSSL_VERSION_NUMBER >= 0x10100000L || defined(NO_SSL2) || defined(OPENSSL_NO_SSL2)
	    Tcl_AppendResult(interp, protocols[index], ": protocol not supported", NULL);
	    return TCL_ERROR;
#else
	    method = SSLv2_method(); break;
#endif
	case TLS_SSL3:
#if defined(NO_SSL3) || defined(OPENSSL_NO_SSL3) || defined(OPENSSL_NO_SSL3_METHOD)
	    Tcl_AppendResult(interp, protocols[index], ": protocol not supported", NULL);
	    return TCL_ERROR;
#else
	    method = SSLv3_method(); break;
#endif
	case TLS_TLS1:
#if defined(NO_TLS1) || defined(OPENSSL_NO_TLS1) || defined(OPENSSL_NO_TLS1_METHOD)
	    Tcl_AppendResult(interp, protocols[index], ": protocol not supported", NULL);
	    return TCL_ERROR;
#else
	    method = TLSv1_method(); break;
#endif
	case TLS_TLS1_1:
#if defined(NO_TLS1_1) || defined(OPENSSL_NO_TLS1_1) || defined(OPENSSL_NO_TLS1_1_METHOD)
	    Tcl_AppendResult(interp, protocols[index], ": protocol not supported", NULL);
	    return TCL_ERROR;
#else
	    method = TLSv1_1_method(); break;
#endif
	case TLS_TLS1_2:
#if defined(NO_TLS1_2) || defined(OPENSSL_NO_TLS1_2) || defined(OPENSSL_NO_TLS1_2_METHOD)
	    Tcl_AppendResult(interp, protocols[index], ": protocol not supported", NULL);
	    return TCL_ERROR;
#else
	    method = TLSv1_2_method(); break;
#endif
	case TLS_TLS1_3:
#if defined(NO_TLS1_3) || defined(OPENSSL_NO_TLS1_3)
	    Tcl_AppendResult(interp, protocols[index], ": protocol not supported", NULL);
	    return TCL_ERROR;
#else
	    method = TLS_method();
	    SSL_CTX_set_min_proto_version(ctx, TLS1_3_VERSION);
	    SSL_CTX_set_max_proto_version(ctx, TLS1_3_VERSION);
	    break;
#endif
	default:
	    method = TLS_method();
	    break;
    }

    ctx = SSL_CTX_new(method);
    if (ctx == NULL) {
	Tcl_AppendResult(interp, REASON(), NULL);
	return TCL_ERROR;
    }

    ssl = SSL_new(ctx);
    if (ssl == NULL) {
	Tcl_AppendResult(interp, REASON(), NULL);
	SSL_CTX_free(ctx);
	return TCL_ERROR;
    }

    /* Use list and order as would be sent in a ClientHello or all available ciphers */
    if (use_supported) {
	sk = SSL_get1_supported_ciphers(ssl);
    } else {
	sk = SSL_get_ciphers(ssl);
    }

    if (sk != NULL) {
	if (!verbose) {
	    objPtr = Tcl_NewListObj(0, NULL);
	    for (int i = 0; i < sk_SSL_CIPHER_num(sk); i++) {
		const SSL_CIPHER *c = sk_SSL_CIPHER_value(sk, i);
		if (c == NULL) continue;

		/* cipher name or (NONE) */
		cp = SSL_CIPHER_get_name(c);
		if (cp == NULL) break;
		Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(cp, -1));
	    }

	} else {
	    objPtr = Tcl_NewStringObj("",0);
	    for (int i = 0; i < sk_SSL_CIPHER_num(sk); i++) {
		const SSL_CIPHER *c = sk_SSL_CIPHER_value(sk, i);
		if (c == NULL) continue;

		/* textual description of the cipher */
		if (SSL_CIPHER_description(c, buf, sizeof(buf)) != NULL) {
		    Tcl_AppendToObj(objPtr, buf, (Tcl_Size) strlen(buf));
		} else {
		    Tcl_AppendToObj(objPtr, "UNKNOWN\n", 8);
		}
	    }
	}
	if (use_supported) {
	    sk_SSL_CIPHER_free(sk);
	}
    }
    SSL_free(ssl);
    SSL_CTX_free(ctx);

    Tcl_SetObjResult(interp, objPtr);
    return TCL_OK;
	clientData = clientData;
}

/*
 *-------------------------------------------------------------------
 *
 * ProtocolsObjCmd -- list available protocols
 *
 *	This procedure is invoked to process the "tls::protocols" command
 *	to list available protocols.
 *
 * Results:
 *	A standard Tcl result list.
 *
 * Side effects:
 *	none
 *
 *-------------------------------------------------------------------
 */
static int
ProtocolsObjCmd(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
    Tcl_Obj *objPtr;

    dprintf("Called");

    if (objc != 1) {
	Tcl_WrongNumArgs(interp, 1, objv, "");
	return TCL_ERROR;
    }

    ERR_clear_error();

    objPtr = Tcl_NewListObj(0, NULL);

#if OPENSSL_VERSION_NUMBER < 0x10100000L && !defined(NO_SSL2) && !defined(OPENSSL_NO_SSL2)
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(protocols[TLS_SSL2], -1));
#endif
#if !defined(NO_SSL3) && !defined(OPENSSL_NO_SSL3) && !defined(OPENSSL_NO_SSL3_METHOD)
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(protocols[TLS_SSL3], -1));
#endif
#if !defined(NO_TLS1) && !defined(OPENSSL_NO_TLS1) && !defined(OPENSSL_NO_TLS1_METHOD)
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(protocols[TLS_TLS1], -1));
#endif
#if !defined(NO_TLS1_1) && !defined(OPENSSL_NO_TLS1_1) && !defined(OPENSSL_NO_TLS1_1_METHOD)
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(protocols[TLS_TLS1_1], -1));
#endif
#if !defined(NO_TLS1_2) && !defined(OPENSSL_NO_TLS1_2) && !defined(OPENSSL_NO_TLS1_2_METHOD)
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(protocols[TLS_TLS1_2], -1));
#endif
#if !defined(NO_TLS1_3) && !defined(OPENSSL_NO_TLS1_3)
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(protocols[TLS_TLS1_3], -1));
#endif

    Tcl_SetObjResult(interp, objPtr);
    return TCL_OK;
	clientData = clientData;
}

/*
 *-------------------------------------------------------------------
 *
 * HandshakeObjCmd --
 *
 *	This command is used to verify whether the handshake is complete
 *	or not.

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "channel");
	return(TCL_ERROR);
    }

    ERR_clear_error();

    chan = Tcl_GetChannel(interp, Tcl_GetStringFromObj(objv[1], (Tcl_Size *)NULL), NULL);
    if (chan == (Tcl_Channel) NULL) {
	return(TCL_ERROR);
    }

    /* Make sure to operate on the topmost channel */
    chan = Tcl_GetTopChannel(chan);
    if (Tcl_GetChannelType(chan) != Tls_ChannelType()) {

    Tcl_Channel chan;		/* The channel to set a mode on. */
    State *statePtr;		/* client state for ssl socket */
    SSL_CTX *ctx	        = NULL;
    Tcl_Obj *script	        = NULL;
    Tcl_Obj *password	        = NULL;
    Tcl_Obj *vcmd	        = NULL;
    Tcl_DString upperChannelTranslation, upperChannelBlocking, upperChannelEncoding, upperChannelEOFChar;
    int idx;
    Tcl_Size len;
    int flags		        = TLS_TCL_INIT;
    int server		        = 0;	/* is connection incoming or outgoing? */
    char *keyfile	        = NULL;
    char *certfile	        = NULL;
    unsigned char *key  	= NULL;
    Tcl_Size key_len                 = 0;
    unsigned char *cert         = NULL;
    Tcl_Size cert_len                = 0;
    char *ciphers	        = NULL;
    char *ciphersuites	        = NULL;
    char *CAfile	        = NULL;
    char *CAdir		        = NULL;
    char *DHparams	        = NULL;
    char *model		        = NULL;
    char *servername	        = NULL;	/* hostname for Server Name Indication */

    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "channel ?options?");
	return TCL_ERROR;
    }

    ERR_clear_error();

    chan = Tcl_GetChannel(interp, Tcl_GetStringFromObj(objv[1], (Tcl_Size *)NULL), NULL);
    if (chan == (Tcl_Channel) NULL) {
	return TCL_ERROR;
    }

    /* Make sure to operate on the topmost channel */
    chan = Tcl_GetTopChannel(chan);

    for (idx = 2; idx < objc; idx++) {
	char *opt = Tcl_GetStringFromObj(objv[idx], (Tcl_Size *)NULL);

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

	OPTOBJ("-alpn", alpn);
	OPTSTR("-cadir", CAdir);
	OPTSTR("-cafile", CAfile);

	OPTBYTE("-key", key, key_len);
	OPTSTR("-keyfile", keyfile);
	OPTSTR("-model", model);
	OPTOBJ("-password", password);
	OPTBOOL("-post_handshake", post_handshake);
	OPTBOOL("-request", request);
	OPTBOOL("-require", require);
	OPTINT("-securitylevel", level);
	OPTBOOL("-server", server);
	OPTSTR("-servername", servername);
	OPTSTR("-session_id", session_id);
	OPTBOOL("-ssl2", ssl2);
	OPTBOOL("-ssl3", ssl3);
	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, -securitylevel, -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;

		"\": not a TLS channel", NULL);
	    Tcl_SetErrorCode(interp, "TLS", "IMPORT", "CHANNEL", "INVALID", (char *) NULL);
	    Tls_Free((char *) statePtr);
	    return TCL_ERROR;
	}
	ctx = ((State *)Tcl_GetChannelInstanceData(chan))->ctx;
    } else {
	if ((ctx = CTX_Init(statePtr, server, proto, keyfile, certfile, key, cert, (int) key_len,
	    (int) cert_len, CAdir, CAfile, ciphers, ciphersuites, level, DHparams)) == NULL) {
	    Tls_Free((char *) statePtr);
	    return TCL_ERROR;
	}
    }

    statePtr->ctx = ctx;

    /* Enable Application-Layer Protocol Negotiation. Examples are: http/1.0,
	http/1.1, h2, h3, ftp, imap, pop3, xmpp-client, xmpp-server, mqtt, irc, etc. */
    if (alpn) {
	/* Convert a TCL list into a protocol-list in wire-format */
	unsigned char *protos, *p;
	unsigned int protos_len = 0;
	Tcl_Size cnt, i;
	int j;
	Tcl_Obj **list;

	if (Tcl_ListObjGetElements(interp, alpn, &cnt, &list) != TCL_OK) {
	    Tls_Free((char *) statePtr);
	    return TCL_ERROR;
	}

	/* Determine the memory required for the protocol-list */
	for (i = 0; i < cnt; i++) {
	    Tcl_GetStringFromObj(list[i], &len);
	    if (len > 255) {
		Tcl_AppendResult(interp, "ALPN protocol name too long", (char *) NULL);
		Tcl_SetErrorCode(interp, "TLS", "IMPORT", "ALPN", "FAILED", (char *) NULL);
		Tls_Free((char *) statePtr);
		return TCL_ERROR;
	    }
	    protos_len += 1 + (int) len;
	}

	/* Build the complete protocol-list */
	protos = ckalloc(protos_len);
	/* protocol-lists consist of 8-bit length-prefixed, byte strings */
	for (j = 0, p = protos; j < cnt; j++) {
	    char *str = Tcl_GetStringFromObj(list[j], &len);
	    *p++ = (unsigned char) len;
	    memcpy(p, str, (size_t) len);
	    p += len;
	}

	/* SSL_set_alpn_protos makes a copy of the protocol-list */
	/* Note: This functions reverses the return value convention */
	if (SSL_set_alpn_protos(statePtr->ssl, protos, protos_len)) {
	    Tcl_AppendResult(interp, "failed to set ALPN protocols", (char *) NULL);

	statePtr->protos_len = 0;
    }

    /*
     * SSL Callbacks
     */
    SSL_set_app_data(statePtr->ssl, (void *)statePtr);	/* point back to us */

    SSL_set_verify(statePtr->ssl, verify, VerifyCallback);
    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); */

    int off = 0;
    int load_private_key;
    const SSL_METHOD *method;

    dprintf("Called");

    if (!proto) {
	Tcl_AppendResult(interp, "no valid protocol selected", (char *) NULL);
	return NULL;
    }

    /* create SSL context */
#if OPENSSL_VERSION_NUMBER >= 0x10100000L || defined(NO_SSL2) || defined(OPENSSL_NO_SSL2)
    if (ENABLED(proto, TLS_PROTO_SSL2)) {
	Tcl_AppendResult(interp, "SSL2 protocol not supported", (char *) NULL);
	return NULL;
    }
#endif
#if defined(NO_SSL3) || defined(OPENSSL_NO_SSL3)
    if (ENABLED(proto, TLS_PROTO_SSL3)) {
	Tcl_AppendResult(interp, "SSL3 protocol not supported", (char *) NULL);
	return NULL;
    }
#endif
#if defined(NO_TLS1) || defined(OPENSSL_NO_TLS1)
    if (ENABLED(proto, TLS_PROTO_TLS1)) {
	Tcl_AppendResult(interp, "TLS 1.0 protocol not supported", (char *) NULL);
	return NULL;
    }
#endif
#if defined(NO_TLS1_1) || defined(OPENSSL_NO_TLS1_1)
    if (ENABLED(proto, TLS_PROTO_TLS1_1)) {
	Tcl_AppendResult(interp, "TLS 1.1 protocol not supported", (char *) NULL);
	return NULL;
    }
#endif
#if defined(NO_TLS1_2) || defined(OPENSSL_NO_TLS1_2)
    if (ENABLED(proto, TLS_PROTO_TLS1_2)) {
	Tcl_AppendResult(interp, "TLS 1.2 protocol not supported", (char *) NULL);
	return NULL;
    }
#endif
#if defined(NO_TLS1_3) || defined(OPENSSL_NO_TLS1_3)
    if (ENABLED(proto, TLS_PROTO_TLS1_3)) {
	Tcl_AppendResult(interp, "TLS 1.3 protocol not supported", (char *) NULL);
	return NULL;
    }
#endif
    if (proto == 0) {
	/* Use full range */
	SSL_CTX_set_min_proto_version(ctx, 0);
	SSL_CTX_set_max_proto_version(ctx, 0);

    }
#endif

    /* Force cipher selection order by server */
    if (!isServer) {
	SSL_CTX_set_options(ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
    }





    SSL_CTX_set_app_data(ctx, (void*)interp);	/* remember the interpreter */
    SSL_CTX_set_options(ctx, SSL_OP_ALL);	/* all SSL bug workarounds */
    SSL_CTX_set_options(ctx, SSL_OP_NO_COMPRESSION);	/* disable compression even if supported */
    SSL_CTX_set_options(ctx, off);		/* disable protocol versions */
#if OPENSSL_VERSION_NUMBER < 0x10101000L
    SSL_CTX_set_mode(ctx, SSL_MODE_AUTO_RETRY);	/* handle new handshakes in background. On by default in OpenSSL 1.1.1. */

    if (objc < 2 || objc > 3 || (objc == 3 && !strcmp(Tcl_GetString(objv[1]), "-local"))) {
	Tcl_WrongNumArgs(interp, 1, objv, "?-local? channel");
	return TCL_ERROR;
    }

    /* Get channel Id */
    channelName = Tcl_GetStringFromObj(objv[(objc == 2 ? 1 : 2)], (Tcl_Size *) NULL);
    chan = Tcl_GetChannel(interp, channelName, &mode);
    if (chan == (Tcl_Channel) NULL) {
	return TCL_ERROR;
    }

    /* Make sure to operate on the topmost channel */
    chan = Tcl_GetTopChannel(chan);

    /* Get certificate for peer or self */
    if (objc == 2) {
	peer = SSL_get_peer_certificate(statePtr->ssl);
    } else {
	peer = SSL_get_certificate(statePtr->ssl);
    }

    /* Get X509 certificate info */
    if (peer) {
	objPtr = Tls_NewX509Obj(interp, peer);
	if (objc == 2) {
	    X509_free(peer);
	    peer = NULL;
	}

    }

    /* Verify mode depth */
    LAPPEND_INT(interp, objPtr, "verifyDepth", SSL_get_verify_depth(statePtr->ssl));

    /* Report the selected protocol as a result of the negotiation */
    SSL_get0_alpn_selected(statePtr->ssl, &proto, &len);
    LAPPEND_STR(interp, objPtr, "alpn", (char *)proto, (Tcl_Size) len);
    LAPPEND_STR(interp, objPtr, "protocol", SSL_get_version(statePtr->ssl), -1);

    /* Valid for non-RSA signature and TLS 1.3 */
    if (objc == 2) {
	res = SSL_get_peer_signature_nid(statePtr->ssl, &nid);
    } else {
	res = SSL_get_signature_nid(statePtr->ssl, &nid);

    const EVP_MD *md;

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "channel");
	return(TCL_ERROR);
    }

    chan = Tcl_GetChannel(interp, Tcl_GetStringFromObj(objv[1], (Tcl_Size *)NULL), NULL);
    if (chan == (Tcl_Channel) NULL) {
	return(TCL_ERROR);
    }

    /* Make sure to operate on the topmost channel */
    chan = Tcl_GetTopChannel(chan);
    if (Tcl_GetChannelType(chan) != Tls_ChannelType()) {

	/* Get protocol */
	LAPPEND_STR(interp, objPtr, "protocol", SSL_get_version(ssl), -1);

	/* Renegotiation allowed */
	LAPPEND_BOOL(interp, objPtr, "renegotiation_allowed", SSL_get_secure_renegotiation_support(ssl));

	/* Get security level */
	LAPPEND_INT(interp, objPtr, "securitylevel", SSL_get_security_level(ssl));

	/* Session info */
	LAPPEND_BOOL(interp, objPtr, "session_reused", SSL_session_reused(ssl));

	/* Is server info */
	LAPPEND_BOOL(interp, objPtr, "is_server", SSL_is_server(ssl));

	LAPPEND_STR(interp, objPtr, "keyExchangeNID", (char *)OBJ_nid2ln(SSL_CIPHER_get_kx_nid(cipher)), -1);
	LAPPEND_STR(interp, objPtr, "authenticationNID", (char *)OBJ_nid2ln(SSL_CIPHER_get_auth_nid(cipher)), -1);

	/* message authentication code - Cipher is AEAD (e.g. GCM or ChaCha20/Poly1305) or not */
	/* Authenticated Encryption with associated data (AEAD) check */
	LAPPEND_BOOL(interp, objPtr, "cipher_is_aead", SSL_CIPHER_is_aead(cipher));

	/* Digest used during the SSL/TLS handshake when using the cipher. */
	md = SSL_CIPHER_get_handshake_digest(cipher);
	LAPPEND_STR(interp, objPtr, "handshake_digest", (char *)EVP_MD_name(md), -1);

	/* Get OpenSSL-specific ID, not IANA ID */
	LAPPEND_INT(interp, objPtr, "cipher_id", (int) SSL_CIPHER_get_id(cipher));

	/* Two-byte ID used in the TLS protocol of the given cipher */
	LAPPEND_INT(interp, objPtr, "protocol_id", (int) SSL_CIPHER_get_protocol_id(cipher));

	/* Textual description of the cipher */
	if (SSL_CIPHER_description(cipher, buf, sizeof(buf)) != NULL) {
	    LAPPEND_STR(interp, objPtr, "description", buf, -1);
	}




    }

    /* Session info */
    session = SSL_get_session(ssl);
    if (session != NULL) {
	const unsigned char *ticket;
	size_t len2;
	unsigned int ulen;
	const unsigned char *session_id, *proto;
	char buffer[SSL_MAX_MASTER_KEY_LENGTH];

	/* Report the selected protocol as a result of the ALPN negotiation */
	SSL_SESSION_get0_alpn_selected(session, &proto, &len2);
	LAPPEND_STR(interp, objPtr, "alpn", (char *) proto, (Tcl_Size) len2);

	/* Report the selected protocol as a result of the NPN negotiation */
#ifdef USE_NPN
	SSL_get0_next_proto_negotiated(ssl, &proto, &ulen);
	LAPPEND_STR(interp, objPtr, "npn", (char *) proto, (Tcl_Size) ulen);
#endif

	/* Resumable session */
	LAPPEND_BOOL(interp, objPtr, "resumable", SSL_SESSION_is_resumable(session));

	/* Session start time (seconds since epoch) */
	LAPPEND_LONG(interp, objPtr, "start_time", SSL_SESSION_get_time(session));

	/* Timeout value - SSL_CTX_get_timeout (in seconds) */
	LAPPEND_LONG(interp, objPtr, "timeout", SSL_SESSION_get_timeout(session));

	/* Session id - TLSv1.2 and below only */
	session_id = SSL_SESSION_get_id(session, &ulen);
	LAPPEND_BARRAY(interp, objPtr, "session_id", session_id, (Tcl_Size) ulen);

	/* Session context */
	session_id = SSL_SESSION_get0_id_context(session, &ulen);
	LAPPEND_BARRAY(interp, objPtr, "session_context", session_id, (Tcl_Size) ulen);

	/* Session ticket - client only */
	SSL_SESSION_get0_ticket(session, &ticket, &len2);
	LAPPEND_BARRAY(interp, objPtr, "session_ticket", ticket, (Tcl_Size) len2);

	/* Session ticket lifetime hint (in seconds) */
	LAPPEND_LONG(interp, objPtr, "lifetime", SSL_SESSION_get_ticket_lifetime_hint(session));

	/* Ticket app data */
	SSL_SESSION_get0_ticket_appdata(session, &ticket, &len2);
	LAPPEND_BARRAY(interp, objPtr, "ticket_app_data", ticket, (Tcl_Size) len2);

	/* Get master key */
	len2 = SSL_SESSION_get_master_key(session, buffer, SSL_MAX_MASTER_KEY_LENGTH);
	LAPPEND_BARRAY(interp, objPtr, "master_key", buffer, (Tcl_Size) len2);

	/* Compression id */
	unsigned int id = SSL_SESSION_get_compress_id(session);
	LAPPEND_STR(interp, objPtr, "compression_id", id == 1 ? "zlib" : "none", -1);
    }

    /* Compression info */

    /* CA List */
    /* IF not a server, same as SSL_get0_peer_CA_list. If server same as SSL_CTX_get_client_CA_list */
    listPtr = Tcl_NewListObj(0, NULL);
    STACK_OF(X509_NAME) *ca_list;
    if ((ca_list = SSL_get_client_CA_list(ssl)) != NULL) {
	char buffer[BUFSIZ];

	for (int i = 0; i < sk_X509_NAME_num(ca_list); i++) {
	    X509_NAME *name = sk_X509_NAME_value(ca_list, i);
	    if (name) {
		X509_NAME_oneline(name, buffer, BUFSIZ);
		Tcl_ListObjAppendElement(interp, listPtr, Tcl_NewStringObj(buffer, -1));
	    }
	}
    }
    LAPPEND_OBJ(interp, objPtr, "caList", listPtr);
    LAPPEND_INT(interp, objPtr, "caListCount", sk_X509_NAME_num(ca_list));

    Tcl_SetObjResult(interp, objPtr);
    return TCL_OK;
	clientData = clientData;
}

/*
 *-------------------------------------------------------------------
 *
 * VersionObjCmd -- return version string from OpenSSL.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	None.
 *
 *-------------------------------------------------------------------
 */
static int
VersionObjCmd(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
    Tcl_Obj *objPtr;

    dprintf("Called");

    objPtr = Tcl_NewStringObj(OPENSSL_VERSION_TEXT, -1);
    Tcl_SetObjResult(interp, objPtr);

    return TCL_OK;
	clientData = clientData;
	objc = objc;
	objv = objv;
}

/*
 *-------------------------------------------------------------------
 *
 * MiscObjCmd -- misc commands
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	None.
 *
 *-------------------------------------------------------------------
 */
static int
MiscObjCmd(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
    static const char *commands [] = { "req", "strreq", NULL };
    enum command { C_REQ, C_STRREQ, C_DUMMY };
    Tcl_Size cmd;
    int isStr;
    char buffer[16384];

    dprintf("Called");

    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "subcommand ?args?");
	return TCL_ERROR;

    switch ((enum command) cmd) {
	case C_REQ:
	case C_STRREQ: {
	    EVP_PKEY *pkey=NULL;
	    X509 *cert=NULL;
	    X509_NAME *name=NULL;
	    Tcl_Obj **listv;
	    Tcl_Size listc;
	    int i;

	    BIO *out=NULL;

	    char *k_C="",*k_ST="",*k_L="",*k_O="",*k_OU="",*k_CN="",*k_Email="";
	    char *keyout,*pemout,*str;
	    int keysize,serial=0,days=365;

	    pemout=Tcl_GetString(objv[4]);
	    if (isStr) {
		Tcl_SetVar(interp,keyout,"",0);
		Tcl_SetVar(interp,pemout,"",0);
	    }

	    if (objc>=6) {
		if (Tcl_ListObjGetElements(interp, objv[5], &listc, &listv) != TCL_OK) {

		    return TCL_ERROR;
		}

		if ((listc%2) != 0) {
		    Tcl_SetResult(interp,"Information list must have even number of arguments",NULL);
		    return TCL_ERROR;
		}

#endif
    if (Tcl_PkgRequire(interp, "Tcl", "8.5-", 0) == NULL) {
	return TCL_ERROR;
    }
#endif

    if (TlsLibInit(0) != TCL_OK) {
	Tcl_AppendResult(interp, "could not initialize SSL library", (char *) NULL);
	return TCL_ERROR;
    }

    Tcl_CreateObjCommand(interp, "tls::ciphers", CiphersObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
    Tcl_CreateObjCommand(interp, "tls::connection", ConnectionInfoObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
    Tcl_CreateObjCommand(interp, "tls::handshake", HandshakeObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
    Tcl_CreateObjCommand(interp, "tls::import", ImportObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);

    Tcl_CreateObjCommand(interp, "tls::unimport", UnimportObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
    Tcl_CreateObjCommand(interp, "tls::status", StatusObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
    Tcl_CreateObjCommand(interp, "tls::version", VersionObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
    Tcl_CreateObjCommand(interp, "tls::misc", MiscObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
    Tcl_CreateObjCommand(interp, "tls::protocols", ProtocolsObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);

    if (interp) {
	Tcl_Eval(interp, tlsTclInitScript);
    }

    return Tcl_PkgProvide(interp, PACKAGE_NAME, PACKAGE_VERSION);
}

/*
 * Copyright (C) 1997-2000 Matt Newman <matt@novadigm.com>
 *
 * Provides BIO layer to interface openssl to Tcl.
 */

#include "tlsInt.h"

static int BioWrite(BIO *bio, const char *buf, int bufLen) {
    Tcl_Channel chan;
    Tcl_Size ret;
    int tclEofChan, tclErrno;

    chan = Tls_GetParent((State *) BIO_get_data(bio), 0);

    dprintf("[chan=%p] BioWrite(%p, <buf>, %d)", (void *)chan, (void *) bio, bufLen);

    ret = Tcl_WriteRaw(chan, buf, (Tcl_Size) bufLen);

    tclEofChan = Tcl_Eof(chan);
    tclErrno = Tcl_GetErrno();

    dprintf("[chan=%p] BioWrite(%d) -> %" TCL_SIZE_MODIFIER "d [tclEof=%d; tclErrno=%d]",
	(void *) chan, bufLen, ret, tclEofChan, Tcl_GetErrno());

    BIO_clear_flags(bio, BIO_FLAGS_WRITE | BIO_FLAGS_SHOULD_RETRY);

    if (tclEofChan && ret <= 0) {
	dprintf("Got EOF while reading, returning a Connection Reset error which maps to Soft EOF");
	Tcl_SetErrno(ECONNRESET);
	ret = 0;

    if (ret != -1 || (ret == -1 && tclErrno == EAGAIN)) {
	if (BIO_should_read(bio)) {
	    dprintf("Setting should retry read flag");

	    BIO_set_retry_read(bio);
	}
    }
    return((int) ret);
}

static int BioRead(BIO *bio, char *buf, int bufLen) {
    Tcl_Channel chan;
    Tcl_Size ret = 0;
    int tclEofChan, tclErrno;

    chan = Tls_GetParent((State *) BIO_get_data(bio), 0);

    dprintf("[chan=%p] BioRead(%p, <buf>, %d)", (void *) chan, (void *) bio, bufLen);

    if (buf == NULL) {
	return 0;
    }

    ret = Tcl_ReadRaw(chan, buf, (Tcl_Size) bufLen);

    tclEofChan = Tcl_Eof(chan);
    tclErrno = Tcl_GetErrno();

    dprintf("[chan=%p] BioRead(%d) -> %" TCL_SIZE_MODIFIER "d [tclEof=%d; tclErrno=%d]",
	(void *) chan, bufLen, ret, tclEofChan, tclErrno);

    BIO_clear_flags(bio, BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY);

    if (tclEofChan && ret <= 0) {
	dprintf("Got EOF while reading, returning a Connection Reset error which maps to Soft EOF");
	Tcl_SetErrno(ECONNRESET);
	ret = 0;

	if (BIO_should_write(bio)) {
	    dprintf("Setting should retry write flag");

	    BIO_set_retry_write(bio);
	}
    }

    dprintf("BioRead(%p, <buf>, %d) [%p] returning %" TCL_SIZE_MODIFIER "d", (void *) bio,
	bufLen, (void *) chan, ret);

    return((int) ret);
}

static int BioPuts(BIO *bio, const char *str) {
    dprintf("BioPuts(%p, <string:%p>) called", bio, str);

    return BioWrite(bio, str, (int) strlen(str));
}

		dprintf("Flushing the lower layers failed, this will probably terminate this session");
	    }
	}

	rc = SSL_get_error(statePtr->ssl, err);

	dprintf("Got error: %i (rc = %i)", err, rc);
	dprintf("Got error: %s", ERR_reason_error_string(ERR_get_error()));

	bioShouldRetry = 0;
	if (err <= 0) {
	    if (rc == SSL_ERROR_WANT_CONNECT || rc == SSL_ERROR_WANT_ACCEPT || rc == SSL_ERROR_WANT_READ || rc == SSL_ERROR_WANT_WRITE) {
		bioShouldRetry = 1;
	    } else if (BIO_should_retry(statePtr->bio)) {
		bioShouldRetry = 1;

	    }

	    statePtr->flags |= TLS_TCL_HANDSHAKE_FAILED;
	    return(-1);

	case SSL_ERROR_SSL:
	    dprintf("Got permanent fatal SSL error, aborting immediately");
	    Tls_Error(statePtr, (char *)ERR_reason_error_string(ERR_get_error()));
	    statePtr->flags |= TLS_TCL_HANDSHAKE_FAILED;
	    *errorCodePtr = ECONNABORTED;
	    return(-1);

	case SSL_ERROR_WANT_CONNECT:
	case SSL_ERROR_WANT_ACCEPT:
	case SSL_ERROR_WANT_X509_LOOKUP:

#   endif
#endif

/*
 * Backwards compatibility for size type change
 */
#if TCL_MAJOR_VERSION < 9 && TCL_MINOR_VERSION < 7
    #ifndef Tcl_Size
        typedef int Tcl_Size;
    #endif

    #define TCL_SIZE_MODIFIER ""
#endif

#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/opensslv.h>

#else
#define dprintf(...) if (0) { fprintf(stderr, __VA_ARGS__); }
#define dprintBuffer(bufferName, bufferLength) /**/
#define dprintFlags(statePtr) /**/
#endif

#define TCLTLS_SSL_ERROR(ssl,err) ((char*)ERR_reason_error_string((unsigned long)SSL_get_error((ssl),(err))))


/* Common list append macros */
#define LAPPEND_BARRAY(interp, obj, text, value, size) {\
    if (text != NULL) Tcl_ListObjAppendElement(interp, obj, Tcl_NewStringObj(text, -1)); \
    Tcl_ListObjAppendElement(interp, obj, Tcl_NewByteArrayObj(value, size)); \
}
#define LAPPEND_STR(interp, obj, text, value, size) {\

Tcl_Obj         *Tls_NewX509Obj(Tcl_Interp *interp, X509 *cert);
Tcl_Obj		*Tls_NewCAObj(Tcl_Interp *interp, const SSL *ssl, int peer);
void            Tls_Error(State *statePtr, char *msg);
void            Tls_Free(char *blockPtr);
void            Tls_Clean(State *statePtr);
int             Tls_WaitForConnect(State *statePtr, int *errorCodePtr, int handshakeFailureIsPermanent);



BIO             *BIO_new_tcl(State* statePtr, int flags);

#define PTR2INT(x) ((int) ((intptr_t) (x)))

#endif /* _TLSINT_H */

/* Define maximum certificate size. Max PEM size 100kB and DER size is 24kB. */
#define CERT_STR_SIZE 32768


/*
 * Binary string to hex string
 */
int String_to_Hex(char* input, int ilen, char *output, int olen) {
    int count = 0;




    for (int i = 0; i < ilen && count < olen - 1; i++, count += 2) {
	sprintf(output + count, "%02X", input[i] & 0xff);


    }
    output[count] = 0;
    return count;
}

/*
 * BIO to Buffer
 */
int BIO_to_Buffer(int result, BIO *bio, void *buffer, int size) {

 */
Tcl_Obj *Tls_x509Identifier(ASN1_OCTET_STRING *astring) {
    Tcl_Obj *resultPtr = NULL;
    int len = 0;
    char buffer[1024];

    if (astring != NULL) {
	len = String_to_Hex((char *)ASN1_STRING_get0_data(astring),
	    ASN1_STRING_length(astring), buffer, 1024);
    }
    resultPtr = Tcl_NewStringObj(buffer, (Tcl_Size) len);
    return resultPtr;
}

/*
 * Get Key Usage
 */
Tcl_Obj *Tls_x509KeyUsage(Tcl_Interp *interp, X509 *cert, uint32_t xflags) {

    }

    if (names = X509_get_ext_d2i(cert, nid, NULL, NULL)) {
	for (int i=0; i < sk_GENERAL_NAME_num(names); i++) {
	    const GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i);

	    len = BIO_to_Buffer(name && GENERAL_NAME_print(bio, name), bio, buffer, 1024);
	    LAPPEND_STR(interp, listPtr, NULL, buffer, (Tcl_Size) len);
	}
	sk_GENERAL_NAME_pop_free(names, GENERAL_NAME_free);
    }
    return listPtr;
}

/*

	    if (distpoint->type == 0) {
		/* full-name GENERALIZEDNAME */
		for (int j = 0; j < sk_GENERAL_NAME_num(distpoint->name.fullname); j++) {
		    GENERAL_NAME *gen = sk_GENERAL_NAME_value(distpoint->name.fullname, j);
		    int type;
		    ASN1_STRING *uri = GENERAL_NAME_get0_value(gen, &type);
		    if (type == GEN_URI) {
			LAPPEND_STR(interp, listPtr, NULL, ASN1_STRING_get0_data(uri), (Tcl_Size) ASN1_STRING_length(uri));
		    }
		}
	    } else if (distpoint->type == 1) {
		/* relative-name X509NAME */
		STACK_OF(X509_NAME_ENTRY) *sk_relname = distpoint->name.relativename;
		for (int j = 0; j < sk_X509_NAME_ENTRY_num(sk_relname); j++) {
		    X509_NAME_ENTRY *e = sk_X509_NAME_ENTRY_value(sk_relname, j);
		    ASN1_STRING *d = X509_NAME_ENTRY_get_data(e);
		    LAPPEND_STR(interp, listPtr, NULL, ASN1_STRING_data(d), (Tcl_Size) ASN1_STRING_length(d));
		}
	    }
	}
	CRL_DIST_POINTS_free(crl);
    }
    return listPtr;
}

    if (ads = X509_get_ext_d2i(cert, NID_info_access, NULL, NULL)) {
	for (int i = 0; i < sk_ACCESS_DESCRIPTION_num(ads); i++) {
	    ad = sk_ACCESS_DESCRIPTION_value(ads, i);
	    if (OBJ_obj2nid(ad->method) == NID_ad_ca_issuers && ad->location) {
		if (ad->location->type == GEN_URI) {
		    len = ASN1_STRING_to_UTF8(&buf, ad->location->d.uniformResourceIdentifier);
		    Tcl_ListObjAppendElement(interp, listPtr, Tcl_NewStringObj(buf, (Tcl_Size) len));
		    OPENSSL_free(buf);
		    break;
		}
	    }
	}
	/* sk_ACCESS_DESCRIPTION_pop_free(ads, ACCESS_DESCRIPTION_free); */
	AUTHORITY_INFO_ACCESS_free(ads);

	int sig_nid;

	X509_get0_signature(&sig, &sig_alg, cert);
	/* sig_nid = X509_get_signature_nid(cert) */
	sig_nid = OBJ_obj2nid(sig_alg->algorithm);
	LAPPEND_STR(interp, certPtr, "signatureAlgorithm", OBJ_nid2ln(sig_nid), -1);
	len = (sig_nid != NID_undef) ? String_to_Hex(sig->data, sig->length, buffer, BUFSIZ) : 0;
	LAPPEND_STR(interp, certPtr, "signatureValue", buffer, (Tcl_Size) len);
    }

    /* Version of the encoded certificate - RFC 5280 section 4.1.2.1 */
    LAPPEND_LONG(interp, certPtr, "version", X509_get_version(cert)+1);

    /* Unique number assigned by CA to certificate - RFC 5280 section 4.1.2.2 */
    len = BIO_to_Buffer(i2a_ASN1_INTEGER(bio, X509_get0_serialNumber(cert)), bio, buffer, BUFSIZ);
    LAPPEND_STR(interp, certPtr, "serialNumber", buffer, (Tcl_Size) len);

    /* Signature algorithm used by the CA to sign the certificate. Must match
	signatureAlgorithm. RFC 5280 section 4.1.2.3 */
    LAPPEND_STR(interp, certPtr, "signature", OBJ_nid2ln(X509_get_signature_nid(cert)), -1);

    /* Issuer identifies the entity that signed and issued the cert. RFC 5280 section 4.1.2.4 */
    len = BIO_to_Buffer(X509_NAME_print_ex(bio, X509_get_issuer_name(cert), 0, flags), bio, buffer, BUFSIZ);
    LAPPEND_STR(interp, certPtr, "issuer", buffer, (Tcl_Size) len);

    /* Certificate validity period is the interval the CA warrants that it will
	maintain info on the status of the certificate. RFC 5280 section 4.1.2.5 */
    /* Get Validity - Not Before */
    len = BIO_to_Buffer(ASN1_TIME_print(bio, X509_get0_notBefore(cert)), bio, buffer, BUFSIZ);
    LAPPEND_STR(interp, certPtr, "notBefore", buffer, (Tcl_Size) len);

    /* Get Validity - Not After */
    len = BIO_to_Buffer(ASN1_TIME_print(bio, X509_get0_notAfter(cert)), bio, buffer, BUFSIZ);
    LAPPEND_STR(interp, certPtr, "notAfter", buffer, (Tcl_Size) len);

    /* Subject identifies the entity associated with the public key stored in
	the subject public key field. RFC 5280 section 4.1.2.6 */
    len = BIO_to_Buffer(X509_NAME_print_ex(bio, X509_get_subject_name(cert), 0, flags), bio, buffer, BUFSIZ);
    LAPPEND_STR(interp, certPtr, "subject", buffer, (Tcl_Size) len);

    /* SHA1 Digest (Fingerprint) of cert - DER representation */
    if (X509_digest(cert, EVP_sha1(), md, &len)) {
    len = String_to_Hex(md, len, buffer, BUFSIZ);
	LAPPEND_STR(interp, certPtr, "sha1_hash", buffer, (Tcl_Size) len);
    }

    /* SHA256 Digest (Fingerprint) of cert - DER representation */
    if (X509_digest(cert, EVP_sha256(), md, &len)) {
    len = String_to_Hex(md, len, buffer, BUFSIZ);
	LAPPEND_STR(interp, certPtr, "sha256_hash", buffer, (Tcl_Size) len);
    }

    /* Subject Public Key Info specifies the public key and identifies the
	algorithm with which the key is used. RFC 5280 section 4.1.2.7 */
    if (X509_get_signature_info(cert, &mdnid, &pknid, &bits, &xflags)) {
	ASN1_BIT_STRING *key;
	unsigned int n;

	LAPPEND_STR(interp, certPtr, "signingDigest", OBJ_nid2ln(mdnid), -1);
	LAPPEND_STR(interp, certPtr, "publicKeyAlgorithm", OBJ_nid2ln(pknid), -1);
	LAPPEND_INT(interp, certPtr, "bits", bits); /* Effective security bits */

	key = X509_get0_pubkey_bitstr(cert);
	len = String_to_Hex(key->data, key->length, buffer, BUFSIZ);
	LAPPEND_STR(interp, certPtr, "publicKey", buffer, (Tcl_Size) len);

	len = 0;
	if (X509_pubkey_digest(cert, EVP_get_digestbynid(pknid), md, &n)) {
	    len = String_to_Hex(md, (int)n, buffer, BUFSIZ);
	}
	LAPPEND_STR(interp, certPtr, "publicKeyHash", buffer, (Tcl_Size) len);

	/* digest of the DER representation of the certificate */
	len = 0;
	if (X509_digest(cert, EVP_get_digestbynid(mdnid), md, &n)) {
	    len = String_to_Hex(md, (int)n, buffer, BUFSIZ);
	}
	LAPPEND_STR(interp, certPtr, "signatureHash", buffer, (Tcl_Size) len);
    }

    /* Certificate Purpose. Call before checking for extensions. */
    LAPPEND_STR(interp, certPtr, "purpose", Tls_x509Purpose(cert), -1);
    LAPPEND_OBJ(interp, certPtr, "certificatePurpose", Tls_x509Purposes(interp, cert));

    /* Get extensions flags */
    xflags = X509_get_extension_flags(cert);
    LAPPEND_INT(interp, certPtr, "extFlags", xflags);

	/* Check if cert was issued by CA cert issuer or self signed */
    LAPPEND_BOOL(interp, certPtr, "selfIssued", xflags & EXFLAG_SI);
    LAPPEND_BOOL(interp, certPtr, "selfSigned", xflags & EXFLAG_SS);
    LAPPEND_BOOL(interp, certPtr, "isProxyCert", xflags & EXFLAG_PROXY);
    LAPPEND_BOOL(interp, certPtr, "extInvalid", xflags & EXFLAG_INVALID);
    LAPPEND_BOOL(interp, certPtr, "isCACert", X509_check_ca(cert));

    /* The Unique Ids are used to handle the possibility of reuse of subject
	and/or issuer names over time. RFC 5280 section 4.1.2.8 */
    {
	const ASN1_BIT_STRING *iuid, *suid;
        X509_get0_uids(cert, &iuid, &suid);

	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("issuerUniqueId", -1));
	if (iuid != NULL) {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewByteArrayObj((char *)iuid->data, (Tcl_Size) iuid->length));
	} else {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("", -1));
	}

	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("subjectUniqueId", -1));
	if (suid != NULL) {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewByteArrayObj((char *)suid->data, (Tcl_Size) suid->length));
	} else {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("", -1));
	}
    }

    /* X509 v3 Extensions - RFC 5280 section 4.1.2.9 */
    LAPPEND_INT(interp, certPtr, "extCount", X509_get_ext_count(cert));
    LAPPEND_OBJ(interp, certPtr, "extensions", Tls_x509Extensions(interp, cert));

    /* Authority Key Identifier (AKI) is the Subject Key Identifier (SKI) of
	its signer (the CA). RFC 5280 section 4.2.1.1, NID_authority_key_identifier */
    LAPPEND_OBJ(interp, certPtr, "authorityKeyIdentifier",
	Tls_x509Identifier(X509_get0_authority_key_id(cert)));

    /* Subject Key Identifier (SKI) is used to identify certificates that contain
	a particular public key. RFC 5280 section 4.2.1.2, NID_subject_key_identifier */
    LAPPEND_OBJ(interp, certPtr, "subjectKeyIdentifier",
	Tls_x509Identifier(X509_get0_subject_key_id(cert)));

    /* Key usage extension defines the purpose (e.g., encipherment, signature, certificate
	signing) of the key in the certificate. RFC 5280 section 4.2.1.3, NID_key_usage */

    /* Subject Information Access - RFC 5280 section 4.2.2.2, NID_sinfo_access */

    /* Certificate Alias. If uses a PKCS#12 structure, alias will reflect the
	friendlyName attribute (RFC 2985). */
    {
	len = 0;
        char *string = X509_alias_get0(cert, &len);
	LAPPEND_STR(interp, certPtr, "alias", string, (Tcl_Size) len);
    }

    /* Certificate and dump all data */
    {
	char certStr[CERT_STR_SIZE];

	/* Get certificate */
	len = BIO_to_Buffer(PEM_write_bio_X509(bio, cert), bio, certStr, CERT_STR_SIZE);
	LAPPEND_STR(interp, certPtr, "certificate", certStr, (Tcl_Size) len);

	/* Get all cert info */
	len = BIO_to_Buffer(X509_print_ex(bio, cert, flags, 0), bio, certStr, CERT_STR_SIZE);
	LAPPEND_STR(interp, certPtr, "all", certStr, (Tcl_Size) len);
    }

    BIO_free(bio);
    return certPtr;
}

# Group,Name,Constraints,Setup,Body,Cleanup,Match,Result,Output,Error Output,Return Codes
command,package require tls,,,,,,,,,
command,,,,,,,,,,
command,# Find default CA certificates directory,,,,,,,,,
command,if {[info exists ::env(SSL_CERT_FILE)]} {set ::cafile $::env(SSL_CERT_FILE)} else {set ::cafile [file normalize {C:\Users\Brian\Documents\Source\Build\SSL-1.1\certs\cacert.pem}]},,,,,,,,,
command,,,,,,,,,,
command,# Constraints,,,,,,,,,
command,set protocols [list ssl2 ssl3 tls1 tls1.1 tls1.2 tls1.3],,,,,,,,,
command,foreach protocol $protocols {::tcltest::testConstraint $protocol 0},,,,,,,,,
command,foreach protocol [::tls::protocols] {::tcltest::testConstraint $protocol 1},,,,,,,,,
command,,,,,,,,,,
command,# Helper functions,,,,,,,,,
command,"proc badssl {url} {set port 443;lassign [split $url "":""] url port;if {$port eq """"} {set port 443};set ch [tls::socket -autoservername 1 -require 1 -cafile $::cafile $url $port];if {[catch {tls::handshake $ch} err]} {close $ch;return -code error $err} else {close $ch}}",,,,,,,,,
command,,,,,,,,,,
command,# BadSSL.com Tests,,,,,,,,,
BadSSL,1000-sans,,,badssl 1000-sans.badssl.com,,,handshake failed: certificate verify failed due to: certificate has expired,,,1
BadSSL,10000-sans,,,badssl 10000-sans.badssl.com,,,handshake failed: excessive message size,,,1
BadSSL,3des,,,badssl 3des.badssl.com,,,handshake failed: sslv3 alert handshake failure,,,1
BadSSL,captive-portal,,,badssl captive-portal.badssl.com,,,handshake failed: certificate verify failed due to: Hostname mismatch,,,1
BadSSL,cbc,,,badssl cbc.badssl.com,,,,,,
BadSSL,client-cert-missing,,,badssl client-cert-missing.badssl.com,,,,,,

package require tls

# Find default CA certificates directory
if {[info exists ::env(SSL_CERT_FILE)]} {set ::cafile $::env(SSL_CERT_FILE)} else {set ::cafile [file normalize {C:\Users\Brian\Documents\Source\Build\SSL-1.1\certs\cacert.pem}]}

# Constraints
set protocols [list ssl2 ssl3 tls1 tls1.1 tls1.2 tls1.3]
foreach protocol $protocols {::tcltest::testConstraint $protocol 0}
foreach protocol [::tls::protocols] {::tcltest::testConstraint $protocol 1}

# Helper functions
proc badssl {url} {set port 443;lassign [split $url ":"] url port;if {$port eq ""} {set port 443};set ch [tls::socket -autoservername 1 -require 1 -cafile $::cafile $url $port];if {[catch {tls::handshake $ch} err]} {close $ch;return -code error $err} else {close $ch}}

# BadSSL.com Tests

			}
		    }
		}
		puts $out $buffer

	    } else {
		# Empty line

	    }
	    break
	}
    }

    # Output clean-up commands
    puts $out "\n# Cleanup\n::tcltest::cleanupTests\nreturn"

# Define the object files and resource file that make up the extension.
# Note the resource file does not makes sense if doing a static library build
# hence it is under that condition. TMP_DIR is the output directory
# defined by rules for object files.
PRJ_OBJS = $(TMP_DIR)\tls.obj \
	$(TMP_DIR)\tlsBIO.obj \


	$(TMP_DIR)\tlsIO.obj \
	$(TMP_DIR)\tlsX509.obj

# Define any additional project include flags
# SSL_INSTALL_FOLDER = with the OpenSSL installation folder following.
PRJ_INCLUDES = -I"$(SSL_INSTALL_FOLDER)\include" -I"$(OPENSSL_INSTALL_DIR)\include"

# Define any additional compiler flags that might be required for the project
PRJ_DEFINES = -D NO_SSL2 -D NO_SSL3 -D _CRT_SECURE_NO_WARNINGS
 

# SSL Libs:
#    1. ${LIBCRYPTO}.dll
#    2. ${LIBSSL}.dll
# Where LIBCRYPTO (#1.) and LIBSSL (#2.) are defined as follows:
#    v1.1: libcrypto-1.1-x64.dll and libssl-1.1-x64.dll
#    v3: libcrypto-3-x64.dll and libssl-3-x64.dll
# On *nix libcrypto.so.* and libssl.so.* (where suffix is a version indicator).
#
PRJ_LIBS = \
	"$(SSL_INSTALL_FOLDER)\lib\libssl.lib" \
	"$(SSL_INSTALL_FOLDER)\lib\libcrypto.lib" \
	WS2_32.LIB GDI32.LIB ADVAPI32.LIB CRYPT32.LIB USER32.LIB

# Define the standard targets
!include "targets.vc"

# Project specific targets





# We must define a pkgindex target that will create a pkgIndex.tcl
# file in the $(OUT_DIR) directory. We can just redirect to the
# default-pkgindex target for our sample extension.
pkgindex: default-pkgindex

# The default install target only installs binaries and scripts so add
# an additional target for our documentation. Note this *adds* a target
# since no commands are listed after it. The original targets for
# install (from targets.vc) will remain.
install: default-pkgindex-tea default-install default-install-docs-html

# Test package
test: default-test