/* ssl/d1_clnt.c */

 /* 

  * DTLS implementation written by Nagendra Modadugu

  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.  

  */

 /* ====================================================================

  * Copyright (c) 1999-2005 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

  *    openssl-core@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).

  *

  */

 /* 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.]

  */

 /*

  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

  */

 #include <stdio.h>

 #include "ssl_locl.h"

 #include "kssl_lcl.h"

 #include <openssl/buffer.h>

 #include <openssl/rand.h>

 #include <openssl/objects.h>

 #include <openssl/evp.h>

 #include <openssl/md5.h>

 #ifndef OPENSSL_NO_DH

 #include <openssl/dh.h>

 #endif

 #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

 #include "libssl_wsd.h"

 #endif

 #ifdef EMULATOR

 	GET_STATIC_VAR_FROM_TLS(DTLSv1_client_method_data,d1_clnt,SSL_METHOD)

 	#define DTLSv1_client_method_data (*GET_WSD_VAR_NAME(DTLSv1_client_method_data,d1_clnt,s)())

 #endif

 static SSL_METHOD *dtls1_get_client_method(int ver);

 static int dtls1_get_hello_verify(SSL *s);

 static SSL_METHOD *dtls1_get_client_method(int ver)

 	{

 	if (ver == DTLS1_VERSION)

 		return(DTLSv1_client_method());

 	else

 		return(NULL);

 	}

 EXPORT_C IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,

 			ssl_undefined_function,

 			dtls1_connect,

 			dtls1_get_client_method)

 int dtls1_connect(SSL *s)

 	{

 	BUF_MEM *buf=NULL;

 	unsigned long Time=(unsigned long)time(NULL),l;

 	long num1;

 	void (*cb)(const SSL *ssl,int type,int val)=NULL;

 	int ret= -1;

 	int new_state,state,skip=0;;

 	RAND_add(&Time,sizeof(Time),0);

 	ERR_clear_error();

 	clear_sys_error();

 	if (s->info_callback != NULL)

 		cb=s->info_callback;

 	else if (s->ctx->info_callback != NULL)

 		cb=s->ctx->info_callback;

 	s->in_handshake++;

 	if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 

 	for (;;)

 		{

 		state=s->state;

 		switch(s->state)

 			{

 		case SSL_ST_RENEGOTIATE:

 			s->new_session=1;

 			s->state=SSL_ST_CONNECT;

 			s->ctx->stats.sess_connect_renegotiate++;

 			/* break */

 		case SSL_ST_BEFORE:

 		case SSL_ST_CONNECT:

 		case SSL_ST_BEFORE|SSL_ST_CONNECT:

 		case SSL_ST_OK|SSL_ST_CONNECT:

 			s->server=0;

 			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);

 			if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00))

 				{

 				SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);

 				ret = -1;

 				goto end;

 				}

 			/* s->version=SSL3_VERSION; */

 			s->type=SSL_ST_CONNECT;

 			if (s->init_buf == NULL)

 				{

 				if ((buf=BUF_MEM_new()) == NULL)

 					{

 					ret= -1;

 					goto end;

 					}

 				if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))

 					{

 					ret= -1;

 					goto end;

 					}

 				s->init_buf=buf;

 				buf=NULL;

 				}

 			if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }

 			/* setup buffing BIO */

 			if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }

 			/* don't push the buffering BIO quite yet */

 			s->state=SSL3_ST_CW_CLNT_HELLO_A;

 			s->ctx->stats.sess_connect++;

 			s->init_num=0;

 			/* mark client_random uninitialized */

 			memset(s->s3->client_random,0,sizeof(s->s3->client_random));

 			break;

 		case SSL3_ST_CW_CLNT_HELLO_A:

 		case SSL3_ST_CW_CLNT_HELLO_B:

 			s->shutdown=0;

 			/* every DTLS ClientHello resets Finished MAC */

 			ssl3_init_finished_mac(s);

 			ret=dtls1_client_hello(s);

 			if (ret <= 0) goto end;

 			if ( s->d1->send_cookie)

 				{

 				s->state=SSL3_ST_CW_FLUSH;

 				s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;

 				}

 			else

 				s->state=SSL3_ST_CR_SRVR_HELLO_A;

 			s->init_num=0;

 			/* turn on buffering for the next lot of output */

 			if (s->bbio != s->wbio)

 				s->wbio=BIO_push(s->bbio,s->wbio);

 			break;

 		case SSL3_ST_CR_SRVR_HELLO_A:

 		case SSL3_ST_CR_SRVR_HELLO_B:

 			ret=ssl3_get_server_hello(s);

 			if (ret <= 0) goto end;

 			else

 				{

 				if (s->hit)

 					s->state=SSL3_ST_CR_FINISHED_A;

 				else

 					s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;

 				}

 			s->init_num=0;

 			break;

 		case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:

 		case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:

 			ret = dtls1_get_hello_verify(s);

 			if ( ret <= 0)

 				goto end;

 			if ( s->d1->send_cookie) /* start again, with a cookie */

 				s->state=SSL3_ST_CW_CLNT_HELLO_A;

 			else

 				s->state = SSL3_ST_CR_CERT_A;

 			s->init_num = 0;

 			break;

 		case SSL3_ST_CR_CERT_A:

 		case SSL3_ST_CR_CERT_B:

 			/* Check if it is anon DH */

 			if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))

 				{

 				ret=ssl3_get_server_certificate(s);

 				if (ret <= 0) goto end;

 				}

 			else

 				skip=1;

 			s->state=SSL3_ST_CR_KEY_EXCH_A;

 			s->init_num=0;

 			break;

 		case SSL3_ST_CR_KEY_EXCH_A:

 		case SSL3_ST_CR_KEY_EXCH_B:

 			ret=ssl3_get_key_exchange(s);

 			if (ret <= 0) goto end;

 			s->state=SSL3_ST_CR_CERT_REQ_A;

 			s->init_num=0;

 			/* at this point we check that we have the

 			 * required stuff from the server */

 			if (!ssl3_check_cert_and_algorithm(s))

 				{

 				ret= -1;

 				goto end;

 				}

 			break;

 		case SSL3_ST_CR_CERT_REQ_A:

 		case SSL3_ST_CR_CERT_REQ_B:

 			ret=ssl3_get_certificate_request(s);

 			if (ret <= 0) goto end;

 			s->state=SSL3_ST_CR_SRVR_DONE_A;

 			s->init_num=0;

 			break;

 		case SSL3_ST_CR_SRVR_DONE_A:

 		case SSL3_ST_CR_SRVR_DONE_B:

 			ret=ssl3_get_server_done(s);

 			if (ret <= 0) goto end;

 			if (s->s3->tmp.cert_req)

 				s->state=SSL3_ST_CW_CERT_A;

 			else

 				s->state=SSL3_ST_CW_KEY_EXCH_A;

 			s->init_num=0;

 			break;

 		case SSL3_ST_CW_CERT_A:

 		case SSL3_ST_CW_CERT_B:

 		case SSL3_ST_CW_CERT_C:

 		case SSL3_ST_CW_CERT_D:

 			ret=dtls1_send_client_certificate(s);

 			if (ret <= 0) goto end;

 			s->state=SSL3_ST_CW_KEY_EXCH_A;

 			s->init_num=0;

 			break;

 		case SSL3_ST_CW_KEY_EXCH_A:

 		case SSL3_ST_CW_KEY_EXCH_B:

 			ret=dtls1_send_client_key_exchange(s);

 			if (ret <= 0) goto end;

 			l=s->s3->tmp.new_cipher->algorithms;

 			/* EAY EAY EAY need to check for DH fix cert

 			 * sent back */

 			/* For TLS, cert_req is set to 2, so a cert chain

 			 * of nothing is sent, but no verify packet is sent */

 			if (s->s3->tmp.cert_req == 1)

 				{

 				s->state=SSL3_ST_CW_CERT_VRFY_A;

 				}

 			else

 				{

 				s->state=SSL3_ST_CW_CHANGE_A;

 				s->s3->change_cipher_spec=0;

 				}

 			s->init_num=0;

 			break;

 		case SSL3_ST_CW_CERT_VRFY_A:

 		case SSL3_ST_CW_CERT_VRFY_B:

 			ret=dtls1_send_client_verify(s);

 			if (ret <= 0) goto end;

 			s->state=SSL3_ST_CW_CHANGE_A;

 			s->init_num=0;

 			s->s3->change_cipher_spec=0;

 			break;

 		case SSL3_ST_CW_CHANGE_A:

 		case SSL3_ST_CW_CHANGE_B:

 			ret=dtls1_send_change_cipher_spec(s,

 				SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);

 			if (ret <= 0) goto end;

 			s->state=SSL3_ST_CW_FINISHED_A;

 			s->init_num=0;

 			s->session->cipher=s->s3->tmp.new_cipher;

 #ifdef OPENSSL_NO_COMP

 			s->session->compress_meth=0;

 #else

 			if (s->s3->tmp.new_compression == NULL)

 				s->session->compress_meth=0;

 			else

 				s->session->compress_meth=

 					s->s3->tmp.new_compression->id;

 #endif

 			if (!s->method->ssl3_enc->setup_key_block(s))

 				{

 				ret= -1;

 				goto end;

 				}

 			if (!s->method->ssl3_enc->change_cipher_state(s,

 				SSL3_CHANGE_CIPHER_CLIENT_WRITE))

 				{

 				ret= -1;

 				goto end;

 				}

 			dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);

 			break;

 		case SSL3_ST_CW_FINISHED_A:

 		case SSL3_ST_CW_FINISHED_B:

 			ret=dtls1_send_finished(s,

 				SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,

 				s->method->ssl3_enc->client_finished_label,

 				s->method->ssl3_enc->client_finished_label_len);

 			if (ret <= 0) goto end;

 			s->state=SSL3_ST_CW_FLUSH;

 			/* clear flags */

 			s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;

 			if (s->hit)

 				{

 				s->s3->tmp.next_state=SSL_ST_OK;

 				if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)

 					{

 					s->state=SSL_ST_OK;

 					s->s3->flags|=SSL3_FLAGS_POP_BUFFER;

 					s->s3->delay_buf_pop_ret=0;

 					}

 				}

 			else

 				{

 				s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;

 				}

 			s->init_num=0;

 			/* mark client_random uninitialized */

 			memset (s->s3->client_random,0,sizeof(s->s3->client_random));

 			break;

 		case SSL3_ST_CR_FINISHED_A:

 		case SSL3_ST_CR_FINISHED_B:

 			ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,

 				SSL3_ST_CR_FINISHED_B);

 			if (ret <= 0) goto end;

 			if (s->hit)

 				s->state=SSL3_ST_CW_CHANGE_A;

 			else

 				s->state=SSL_ST_OK;

 			s->init_num=0;

 			break;

 		case SSL3_ST_CW_FLUSH:

 			/* number of bytes to be flushed */

 			num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);

 			if (num1 > 0)

 				{

 				s->rwstate=SSL_WRITING;

 				num1=BIO_flush(s->wbio);

 				if (num1 <= 0) { ret= -1; goto end; }

 				s->rwstate=SSL_NOTHING;

 				}

 			s->state=s->s3->tmp.next_state;

 			break;

 		case SSL_ST_OK:

 			/* clean a few things up */

 			ssl3_cleanup_key_block(s);

 #if 0

 			if (s->init_buf != NULL)

 				{

 				BUF_MEM_free(s->init_buf);

 				s->init_buf=NULL;

 				}

 #endif

 			/* If we are not 'joining' the last two packets,

 			 * remove the buffering now */

 			if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))

 				ssl_free_wbio_buffer(s);

 			/* else do it later in ssl3_write */

 			s->init_num=0;

 			s->new_session=0;

 			ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);

 			if (s->hit) s->ctx->stats.sess_hit++;

 			ret=1;

 			/* s->server=0; */

 			s->handshake_func=dtls1_connect;

 			s->ctx->stats.sess_connect_good++;

 			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);

 			/* done with handshaking */

 			s->d1->handshake_read_seq  = 0;

 			goto end;

 			/* break; */

 		default:

 			SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);

 			ret= -1;

 			goto end;

 			/* break; */

 			}

 		/* did we do anything */

 		if (!s->s3->tmp.reuse_message && !skip)

 			{

 			if (s->debug)

 				{

 				if ((ret=BIO_flush(s->wbio)) <= 0)

 					goto end;

 				}

 			if ((cb != NULL) && (s->state != state))

 				{

 				new_state=s->state;

 				s->state=state;

 				cb(s,SSL_CB_CONNECT_LOOP,1);

 				s->state=new_state;

 				}

 			}

 		skip=0;

 		}

 end:

 	s->in_handshake--;

 	if (buf != NULL)

 		BUF_MEM_free(buf);

 	if (cb != NULL)

 		cb(s,SSL_CB_CONNECT_EXIT,ret);

 	return(ret);

 	}

 int dtls1_client_hello(SSL *s)

 	{

 	unsigned char *buf;

 	unsigned char *p,*d;

 	unsigned int i,j;

 	unsigned long Time,l;

 	SSL_COMP *comp;

 	buf=(unsigned char *)s->init_buf->data;

 	if (s->state == SSL3_ST_CW_CLNT_HELLO_A)

 		{

 		if ((s->session == NULL) ||

 			(s->session->ssl_version != s->version) ||

 			(s->session->not_resumable))

 			{

 			if (!ssl_get_new_session(s,0))

 				goto err;

 			}

 		/* else use the pre-loaded session */

 		p=s->s3->client_random;

 		/* if client_random is initialized, reuse it, we are

 		 * required to use same upon reply to HelloVerify */

 		for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;

 		if (i==sizeof(s->s3->client_random))

 			{

 			Time=(unsigned long)time(NULL);	/* Time */

 			l2n(Time,p);

 			RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);

 			}

 		/* Do the message type and length last */

 		d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);

 		*(p++)=s->version>>8;

 		*(p++)=s->version&0xff;

 		s->client_version=s->version;

 		/* Random stuff */

 		memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);

 		p+=SSL3_RANDOM_SIZE;

 		/* Session ID */

 		if (s->new_session)

 			i=0;

 		else

 			i=s->session->session_id_length;

 		*(p++)=i;

 		if (i != 0)

 			{

 			if (i > sizeof s->session->session_id)

 				{

 				SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);

 				goto err;

 				}

 			memcpy(p,s->session->session_id,i);

 			p+=i;

 			}

 		/* cookie stuff */

 		if ( s->d1->cookie_len > sizeof(s->d1->cookie))

 			{

 			SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);

 			goto err;

 			}

 		*(p++) = s->d1->cookie_len;

 		memcpy(p, s->d1->cookie, s->d1->cookie_len);

 		p += s->d1->cookie_len;

 		/* Ciphers supported */

 		i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);

 		if (i == 0)

 			{

 			SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);

 			goto err;

 			}

 		s2n(i,p);

 		p+=i;

 		/* COMPRESSION */

 		if (s->ctx->comp_methods == NULL)

 			j=0;

 		else

 			j=sk_SSL_COMP_num(s->ctx->comp_methods);

 		*(p++)=1+j;

 		for (i=0; i<j; i++)

 			{

 			comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);

 			*(p++)=comp->id;

 			}

 		*(p++)=0; /* Add the NULL method */

 		l=(p-d);

 		d=buf;

 		d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);

 		s->state=SSL3_ST_CW_CLNT_HELLO_B;

 		/* number of bytes to write */

 		s->init_num=p-buf;

 		s->init_off=0;

 		/* buffer the message to handle re-xmits */

 		dtls1_buffer_message(s, 0);

 		}

 	/* SSL3_ST_CW_CLNT_HELLO_B */

 	return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));

 err:

 	return(-1);

 	}

 static int dtls1_get_hello_verify(SSL *s)

 	{

 	int n, al, ok = 0;

 	unsigned char *data;

 	unsigned int cookie_len;

 	n=s->method->ssl_get_message(s,

 		DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,

 		DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,

 		-1,

 		s->max_cert_list,

 		&ok);

 	if (!ok) return((int)n);

 	if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)

 		{

 		s->d1->send_cookie = 0;

 		s->s3->tmp.reuse_message=1;

 		return(1);

 		}

 	data = (unsigned char *)s->init_msg;

 	if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))

 		{

 		SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);

 		s->version=(s->version&0xff00)|data[1];

 		al = SSL_AD_PROTOCOL_VERSION;

 		goto f_err;

 		}

 	data+=2;

 	cookie_len = *(data++);

 	if ( cookie_len > sizeof(s->d1->cookie))

 		{

 		al=SSL_AD_ILLEGAL_PARAMETER;

 		goto f_err;

 		}

 	memcpy(s->d1->cookie, data, cookie_len);

 	s->d1->cookie_len = cookie_len;

 	s->d1->send_cookie = 1;

 	return 1;

 f_err:

 	ssl3_send_alert(s, SSL3_AL_FATAL, al);

 	return -1;

 	}

 int dtls1_send_client_key_exchange(SSL *s)

 	{

 	unsigned char *p,*d;

 	int n;

 	unsigned long l;

 #ifndef OPENSSL_NO_RSA

 	unsigned char *q;

 	EVP_PKEY *pkey=NULL;

 #endif

 #ifndef OPENSSL_NO_KRB5

         KSSL_ERR kssl_err;

 #endif /* OPENSSL_NO_KRB5 */

 	if (s->state == SSL3_ST_CW_KEY_EXCH_A)

 		{

 		d=(unsigned char *)s->init_buf->data;

 		p= &(d[DTLS1_HM_HEADER_LENGTH]);

 		l=s->s3->tmp.new_cipher->algorithms;

                 /* Fool emacs indentation */

                 if (0) {}

 #ifndef OPENSSL_NO_RSA

 		else if (l & SSL_kRSA)

 			{

 			RSA *rsa;

 			unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];

 			if (s->session->sess_cert->peer_rsa_tmp != NULL)

 				rsa=s->session->sess_cert->peer_rsa_tmp;

 			else

 				{

 				pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);

 				if ((pkey == NULL) ||

 					(pkey->type != EVP_PKEY_RSA) ||

 					(pkey->pkey.rsa == NULL))

 					{

 					SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);

 					goto err;

 					}

 				rsa=pkey->pkey.rsa;

 				EVP_PKEY_free(pkey);

 				}

 			tmp_buf[0]=s->client_version>>8;

 			tmp_buf[1]=s->client_version&0xff;

 			if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)

 					goto err;

 			s->session->master_key_length=sizeof tmp_buf;

 			q=p;

 			/* Fix buf for TLS and [incidentally] DTLS */

 			if (s->version > SSL3_VERSION)

 				p+=2;

 			n=RSA_public_encrypt(sizeof tmp_buf,

 				tmp_buf,p,rsa,RSA_PKCS1_PADDING);

 #ifdef PKCS1_CHECK

 			if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;

 			if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;

 #endif

 			if (n <= 0)

 				{

 				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);

 				goto err;

 				}

 			/* Fix buf for TLS and [incidentally] DTLS */

 			if (s->version > SSL3_VERSION)

 				{

 				s2n(n,q);

 				n+=2;

 				}

 			s->session->master_key_length=

 				s->method->ssl3_enc->generate_master_secret(s,

 					s->session->master_key,

 					tmp_buf,sizeof tmp_buf);

 			OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);

 			}

 #endif

 #ifndef OPENSSL_NO_KRB5

 		else if (l & SSL_kKRB5)

                         {

                         krb5_error_code	krb5rc;

                         KSSL_CTX	*kssl_ctx = s->kssl_ctx;

                         /*  krb5_data	krb5_ap_req;  */

                         krb5_data	*enc_ticket;

                         krb5_data	authenticator, *authp = NULL;

 			EVP_CIPHER_CTX	ciph_ctx;

 			EVP_CIPHER	*enc = NULL;

 			unsigned char	iv[EVP_MAX_IV_LENGTH];

 			unsigned char	tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];

 			unsigned char	epms[SSL_MAX_MASTER_KEY_LENGTH 

 						+ EVP_MAX_IV_LENGTH];

 			int 		padl, outl = sizeof(epms);

 			EVP_CIPHER_CTX_init(&ciph_ctx);

 #ifdef KSSL_DEBUG

                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",

                                 l, SSL_kKRB5);

 #endif	/* KSSL_DEBUG */

 			authp = NULL;

 #ifdef KRB5SENDAUTH

 			if (KRB5SENDAUTH)  authp = &authenticator;

 #endif	/* KRB5SENDAUTH */

                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,

 				&kssl_err);

 			enc = kssl_map_enc(kssl_ctx->enctype);

                         if (enc == NULL)

                             goto err;

 #ifdef KSSL_DEBUG

                         {

                         printf("kssl_cget_tkt rtn %d\n", krb5rc);

                         if (krb5rc && kssl_err.text)

 			  printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);

                         }

 #endif	/* KSSL_DEBUG */

                         if (krb5rc)

                                 {

                                 ssl3_send_alert(s,SSL3_AL_FATAL,

 						SSL_AD_HANDSHAKE_FAILURE);

                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,

 						kssl_err.reason);

                                 goto err;

                                 }

 			/*  20010406 VRS - Earlier versions used KRB5 AP_REQ

 			**  in place of RFC 2712 KerberosWrapper, as in:

 			**

                         **  Send ticket (copy to *p, set n = length)

                         **  n = krb5_ap_req.length;

                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);

                         **  if (krb5_ap_req.data)  

                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);

                         **

 			**  Now using real RFC 2712 KerberosWrapper

 			**  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)

 			**  Note: 2712 "opaque" types are here replaced

 			**  with a 2-byte length followed by the value.

 			**  Example:

 			**  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms

 			**  Where "xx xx" = length bytes.  Shown here with

 			**  optional authenticator omitted.

 			*/

 			/*  KerberosWrapper.Ticket		*/

 			s2n(enc_ticket->length,p);

 			memcpy(p, enc_ticket->data, enc_ticket->length);

 			p+= enc_ticket->length;

 			n = enc_ticket->length + 2;

 			/*  KerberosWrapper.Authenticator	*/

 			if (authp  &&  authp->length)  

 				{

 				s2n(authp->length,p);

 				memcpy(p, authp->data, authp->length);

 				p+= authp->length;

 				n+= authp->length + 2;

 				free(authp->data);

 				authp->data = NULL;

 				authp->length = 0;

 				}

 			else

 				{

 				s2n(0,p);/*  null authenticator length	*/

 				n+=2;

 				}

 			if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)

 			    goto err;

 			/*  20010420 VRS.  Tried it this way; failed.

 			**	EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);

 			**	EVP_CIPHER_CTX_set_key_length(&ciph_ctx,

 			**				kssl_ctx->length);

 			**	EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);

 			*/

 			memset(iv, 0, sizeof iv);  /* per RFC 1510 */

 			EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,

 				kssl_ctx->key,iv);

 			EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,

 				sizeof tmp_buf);

 			EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);

 			outl += padl;

 			if (outl > sizeof epms)

 				{

 				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);

 				goto err;

 				}

 			EVP_CIPHER_CTX_cleanup(&ciph_ctx);

 			/*  KerberosWrapper.EncryptedPreMasterSecret	*/

 			s2n(outl,p);

 			memcpy(p, epms, outl);

 			p+=outl;

 			n+=outl + 2;

                         s->session->master_key_length=

                                 s->method->ssl3_enc->generate_master_secret(s,

 					s->session->master_key,

 					tmp_buf, sizeof tmp_buf);

 			OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);

 			OPENSSL_cleanse(epms, outl);

                         }

 #endif

 #ifndef OPENSSL_NO_DH

 		else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))

 			{

 			DH *dh_srvr,*dh_clnt;

 			if (s->session->sess_cert->peer_dh_tmp != NULL)

 				dh_srvr=s->session->sess_cert->peer_dh_tmp;

 			else

 				{

 				/* we get them from the cert */

 				ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);

 				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);

 				goto err;

 				}

 			/* generate a new random key */

 			if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)

 				{

 				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);

 				goto err;

 				}

 			if (!DH_generate_key(dh_clnt))

 				{

 				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);

 				goto err;

 				}

 			/* use the 'p' output buffer for the DH key, but

 			 * make sure to clear it out afterwards */

 			n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);

 			if (n <= 0)

 				{

 				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);

 				goto err;

 				}

 			/* generate master key from the result */

 			s->session->master_key_length=

 				s->method->ssl3_enc->generate_master_secret(s,

 					s->session->master_key,p,n);

 			/* clean up */

 			memset(p,0,n);

 			/* send off the data */

 			n=BN_num_bytes(dh_clnt->pub_key);

 			s2n(n,p);

 			BN_bn2bin(dh_clnt->pub_key,p);

 			n+=2;

 			DH_free(dh_clnt);

 			/* perhaps clean things up a bit EAY EAY EAY EAY*/

 			}

 #endif

 		else

 			{

 			ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);

 			SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);

 			goto err;

 			}

 		d = dtls1_set_message_header(s, d,

 		SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);

 		/*

 		 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;

 		 l2n3(n,d);

 		 l2n(s->d1->handshake_write_seq,d);

 		 s->d1->handshake_write_seq++;

 		*/

 		s->state=SSL3_ST_CW_KEY_EXCH_B;

 		/* number of bytes to write */

 		s->init_num=n+DTLS1_HM_HEADER_LENGTH;

 		s->init_off=0;

 		/* buffer the message to handle re-xmits */

 		dtls1_buffer_message(s, 0);

 		}

 	/* SSL3_ST_CW_KEY_EXCH_B */

 	return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));

 err:

 	return(-1);

 	}

 int dtls1_send_client_verify(SSL *s)

 	{

 	unsigned char *p,*d;

 	unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];

 	EVP_PKEY *pkey;

 #ifndef OPENSSL_NO_RSA

 	unsigned u=0;

 #endif

 	unsigned long n;

 #ifndef OPENSSL_NO_DSA

 	int j;

 #endif

 	if (s->state == SSL3_ST_CW_CERT_VRFY_A)

 		{

 		d=(unsigned char *)s->init_buf->data;

 		p= &(d[DTLS1_HM_HEADER_LENGTH]);

 		pkey=s->cert->key->privatekey;

 		s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),

 			&(data[MD5_DIGEST_LENGTH]));

 #ifndef OPENSSL_NO_RSA

 		if (pkey->type == EVP_PKEY_RSA)

 			{

 			s->method->ssl3_enc->cert_verify_mac(s,

 				&(s->s3->finish_dgst1),&(data[0]));

 			if (RSA_sign(NID_md5_sha1, data,

 					 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,

 					&(p[2]), &u, pkey->pkey.rsa) <= 0 )

 				{

 				SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);

 				goto err;

 				}

 			s2n(u,p);

 			n=u+2;

 			}

 		else

 #endif

 #ifndef OPENSSL_NO_DSA

 			if (pkey->type == EVP_PKEY_DSA)

 			{

 			if (!DSA_sign(pkey->save_type,

 				&(data[MD5_DIGEST_LENGTH]),

 				SHA_DIGEST_LENGTH,&(p[2]),

 				(unsigned int *)&j,pkey->pkey.dsa))

 				{

 				SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);

 				goto err;

 				}

 			s2n(j,p);

 			n=j+2;

 			}

 		else

 #endif

 			{

 			SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);

 			goto err;

 			}

 		d = dtls1_set_message_header(s, d,

 			SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;

 		s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;

 		s->init_off=0;

 		/* buffer the message to handle re-xmits */

 		dtls1_buffer_message(s, 0);

 		s->state = SSL3_ST_CW_CERT_VRFY_B;

 		}

 	/* s->state = SSL3_ST_CW_CERT_VRFY_B */

 	return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));

 err:

 	return(-1);

 	}

 int dtls1_send_client_certificate(SSL *s)

 	{

 	X509 *x509=NULL;

 	EVP_PKEY *pkey=NULL;

 	int i;

 	unsigned long l;

 	if (s->state ==	SSL3_ST_CW_CERT_A)

 		{

 		if ((s->cert == NULL) ||

 			(s->cert->key->x509 == NULL) ||

 			(s->cert->key->privatekey == NULL))

 			s->state=SSL3_ST_CW_CERT_B;

 		else

 			s->state=SSL3_ST_CW_CERT_C;

 		}

 	/* We need to get a client cert */

 	if (s->state == SSL3_ST_CW_CERT_B)

 		{

 		/* If we get an error, we need to

 		 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);

 		 * We then get retied later */

 		i=0;

 		if (s->ctx->client_cert_cb != NULL)

 			i=s->ctx->client_cert_cb(s,&(x509),&(pkey));

 		if (i < 0)

 			{

 			s->rwstate=SSL_X509_LOOKUP;

 			return(-1);

 			}

 		s->rwstate=SSL_NOTHING;

 		if ((i == 1) && (pkey != NULL) && (x509 != NULL))

 			{

 			s->state=SSL3_ST_CW_CERT_B;

 			if (	!SSL_use_certificate(s,x509) ||

 				!SSL_use_PrivateKey(s,pkey))

 				i=0;

 			}

 		else if (i == 1)

 			{

 			i=0;

 			SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);

 			}

 		if (x509 != NULL) X509_free(x509);

 		if (pkey != NULL) EVP_PKEY_free(pkey);

 		if (i == 0)

 			{

 			if (s->version == SSL3_VERSION)

 				{

 				s->s3->tmp.cert_req=0;

 				ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);

 				return(1);

 				}

 			else

 				{

 				s->s3->tmp.cert_req=2;

 				}

 			}

 		/* Ok, we have a cert */

 		s->state=SSL3_ST_CW_CERT_C;

 		}

 	if (s->state == SSL3_ST_CW_CERT_C)

 		{

 		s->state=SSL3_ST_CW_CERT_D;

 		l=dtls1_output_cert_chain(s,

 			(s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);

 		s->init_num=(int)l;

 		s->init_off=0;

 		/* set header called by dtls1_output_cert_chain() */

 		/* buffer the message to handle re-xmits */

 		dtls1_buffer_message(s, 0);

 		}

 	/* SSL3_ST_CW_CERT_D */

 	return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));

 	}