[openssl.git] / ssl / s3_clnt.c

/* ssl/s3_clnt.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */
/* ====================================================================
 * Copyright (c) 1998-2007 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 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 *
 * Portions of the attached software ("Contribution") are developed by 
 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 *
 * The Contribution is licensed pursuant to the OpenSSL open source
 * license provided above.
 *
 * ECC cipher suite support in OpenSSL originally written by
 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 *
 */
/* ====================================================================
 * Copyright 2005 Nokia. All rights reserved.
 *
 * The portions of the attached software ("Contribution") is developed by
 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 * license.
 *
 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 * support (see RFC 4279) to OpenSSL.
 *
 * No patent licenses or other rights except those expressly stated in
 * the OpenSSL open source license shall be deemed granted or received
 * expressly, by implication, estoppel, or otherwise.
 *
 * No assurances are provided by Nokia that the Contribution does not
 * infringe the patent or other intellectual property rights of any third
 * party or that the license provides you with all the necessary rights
 * to make use of the Contribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 * OTHERWISE.
 */

#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>
#ifdef OPENSSL_FIPS
#include <openssl/fips.h>
#endif
#ifndef OPENSSL_NO_DH
#include <openssl/dh.h>
#endif
#include <openssl/bn.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif

static const SSL_METHOD *ssl3_get_client_method(int ver);
static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);

static const SSL_METHOD *ssl3_get_client_method(int ver)
        {
        if (ver == SSL3_VERSION)
                return(SSLv3_client_method());
        else
                return(NULL);
        }

IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
                        ssl_undefined_function,
                        ssl3_connect,
                        ssl3_get_client_method)

int ssl3_connect(SSL *s)
        {
        BUF_MEM *buf=NULL;
        unsigned long Time=(unsigned long)time(NULL);
        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); 

#ifndef OPENSSL_NO_HEARTBEATS
        /* If we're awaiting a HeartbeatResponse, pretend we
         * already got and don't await it anymore, because
         * Heartbeats don't make sense during handshakes anyway.
         */
        if (s->tlsext_hb_pending)
                {
                s->tlsext_hb_pending = 0;
                s->tlsext_hb_seq++;
                }
#endif

        for (;;)
                {
                state=s->state;

                switch(s->state)
                        {
                case SSL_ST_RENEGOTIATE:
                        s->renegotiate=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 ) != 0x0300)
                                {
                                SSLerr(SSL_F_SSL3_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 */

                        ssl3_init_finished_mac(s);

                        s->state=SSL3_ST_CW_CLNT_HELLO_A;
                        s->ctx->stats.sess_connect++;
                        s->init_num=0;
                        break;

                case SSL3_ST_CW_CLNT_HELLO_A:
                case SSL3_ST_CW_CLNT_HELLO_B:

                        s->shutdown=0;
                        ret=ssl3_client_hello(s);
                        if (ret <= 0) goto end;
                        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;

                        if (s->hit)
                                {
                                s->state=SSL3_ST_CR_FINISHED_A;
#ifndef OPENSSL_NO_TLSEXT
                                if (s->tlsext_ticket_expected)
                                        {
                                        /* receive renewed session ticket */
                                        s->state=SSL3_ST_CR_SESSION_TICKET_A;
                                        }
#endif
                                }
                        else
                                {
#ifndef OPENSSL_NO_TLSEXT
                                /* The server hello indicated that
                                 * an audit proof would follow. */
                                if (s->s3->tlsext_authz_server_promised)
                                        s->state=SSL3_ST_CR_SUPPLEMENTAL_DATA_A;
                                else
#endif
                                        s->state=SSL3_ST_CR_CERT_A;
                                }
                        s->init_num=0;
                        break;
#ifndef OPENSSL_NO_TLSEXT
                case SSL3_ST_CR_SUPPLEMENTAL_DATA_A:
                case SSL3_ST_CR_SUPPLEMENTAL_DATA_B:
                        ret = tls1_get_server_supplemental_data(s);
                        if (ret <= 0) goto end;
                        s->state=SSL3_ST_CR_CERT_A;
                        s->init_num = 0;
                        break;
#endif
                case SSL3_ST_CR_CERT_A:
                case SSL3_ST_CR_CERT_B:
#ifndef OPENSSL_NO_TLSEXT
                        ret=ssl3_check_finished(s);
                        if (ret <= 0) goto end;
                        if (ret == 2)
                                {
                                s->hit = 1;
                                if (s->tlsext_ticket_expected)
                                        s->state=SSL3_ST_CR_SESSION_TICKET_A;
                                else
                                        s->state=SSL3_ST_CR_FINISHED_A;
                                s->init_num=0;
                                break;
                                }
#endif
                        /* Check if it is anon DH/ECDH */
                        /* or PSK */
                        if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
                            !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
                                {
                                ret=ssl3_get_server_certificate(s);
                                if (ret <= 0) goto end;
#ifndef OPENSSL_NO_TLSEXT
                                if (s->tlsext_status_expected)
                                        s->state=SSL3_ST_CR_CERT_STATUS_A;
                                else
                                        s->state=SSL3_ST_CR_KEY_EXCH_A;
                                }
                        else
                                {
                                skip = 1;
                                s->state=SSL3_ST_CR_KEY_EXCH_A;
                                }
#else
                                }
                        else
                                skip=1;

                        s->state=SSL3_ST_CR_KEY_EXCH_A;
#endif
                        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;
#ifndef OPENSSL_NO_SRP
                        if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
                                {
                                if ((ret = SRP_Calc_A_param(s))<=0)
                                        {
                                        SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
                                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
                                        goto end;
                                        }
                                }
#endif
                        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=ssl3_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=ssl3_send_client_key_exchange(s);
                        if (ret <= 0) goto end;
                        /* 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 */
                        /* XXX: For now, we do not support client 
                         * authentication in ECDH cipher suites with
                         * ECDH (rather than ECDSA) certificates.
                         * We need to skip the certificate verify 
                         * message when client's ECDH public key is sent 
                         * inside the client certificate.
                         */
                        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;
                                }
                        if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
                                {
                                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=ssl3_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=ssl3_send_change_cipher_spec(s,
                                SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
                        if (ret <= 0) goto end;

#if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
                        s->state=SSL3_ST_CW_FINISHED_A;
#else
                        if (s->s3->next_proto_neg_seen)
                                s->state=SSL3_ST_CW_NEXT_PROTO_A;
                        else
                                s->state=SSL3_ST_CW_FINISHED_A;
#endif
                        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;
                                }

                        break;

#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
                case SSL3_ST_CW_NEXT_PROTO_A:
                case SSL3_ST_CW_NEXT_PROTO_B:
                        ret=ssl3_send_next_proto(s);
                        if (ret <= 0) goto end;
                        s->state=SSL3_ST_CW_FINISHED_A;
                        break;
#endif

                case SSL3_ST_CW_FINISHED_A:
                case SSL3_ST_CW_FINISHED_B:
                        ret=ssl3_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
                                {
#ifndef OPENSSL_NO_TLSEXT
                                /* Allow NewSessionTicket if ticket expected */
                                if (s->tlsext_ticket_expected)
                                        s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
                                else
#endif
                                
                                s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
                                }
                        s->init_num=0;
                        break;

#ifndef OPENSSL_NO_TLSEXT
                case SSL3_ST_CR_SESSION_TICKET_A:
                case SSL3_ST_CR_SESSION_TICKET_B:
                        ret=ssl3_get_new_session_ticket(s);
                        if (ret <= 0) goto end;
                        s->state=SSL3_ST_CR_FINISHED_A;
                        s->init_num=0;
                break;

                case SSL3_ST_CR_CERT_STATUS_A:
                case SSL3_ST_CR_CERT_STATUS_B:
                        ret=ssl3_get_cert_status(s);
                        if (ret <= 0) goto end;
                        s->state=SSL3_ST_CR_KEY_EXCH_A;
                        s->init_num=0;
                break;
#endif

                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:
                        s->rwstate=SSL_WRITING;
                        if (BIO_flush(s->wbio) <= 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 (s->init_buf != NULL)
                                {
                                BUF_MEM_free(s->init_buf);
                                s->init_buf=NULL;
                                }

                        /* 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->renegotiate=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=ssl3_connect;
                        s->ctx->stats.sess_connect_good++;

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

                        goto end;
                        /* break; */
                        
                default:
                        SSLerr(SSL_F_SSL3_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 ssl3_client_hello(SSL *s)
        {
        unsigned char *buf;
        unsigned char *p,*d;
        int i;
        unsigned long Time,l;
#ifndef OPENSSL_NO_COMP
        int j;
        SSL_COMP *comp;
#endif

        buf=(unsigned char *)s->init_buf->data;
        if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
                {
                SSL_SESSION *sess = s->session;
                if ((sess == NULL) ||
                        (sess->ssl_version != s->version) ||
#ifdef OPENSSL_NO_TLSEXT
                        !sess->session_id_length ||
#else
                        (!sess->session_id_length && !sess->tlsext_tick) ||
#endif
                        (sess->not_resumable))
                        {
                        if (!ssl_get_new_session(s,0))
                                goto err;
                        }
                /* else use the pre-loaded session */

                p=s->s3->client_random;
                Time=(unsigned long)time(NULL);                 /* Time */
                l2n(Time,p);
                if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
                        goto err;

                /* Do the message type and length last */
                d=p= &(buf[4]);

                /* version indicates the negotiated version: for example from
                 * an SSLv2/v3 compatible client hello). The client_version
                 * field is the maximum version we permit and it is also
                 * used in RSA encrypted premaster secrets. Some servers can
                 * choke if we initially report a higher version then
                 * renegotiate to a lower one in the premaster secret. This
                 * didn't happen with TLS 1.0 as most servers supported it
                 * but it can with TLS 1.1 or later if the server only supports
                 * 1.0.
                 *
                 * Possible scenario with previous logic:
                 *      1. Client hello indicates TLS 1.2
                 *      2. Server hello says TLS 1.0
                 *      3. RSA encrypted premaster secret uses 1.2.
                 *      4. Handhaked proceeds using TLS 1.0.
                 *      5. Server sends hello request to renegotiate.
                 *      6. Client hello indicates TLS v1.0 as we now
                 *         know that is maximum server supports.
                 *      7. Server chokes on RSA encrypted premaster secret
                 *         containing version 1.0.
                 *
                 * For interoperability it should be OK to always use the
                 * maximum version we support in client hello and then rely
                 * on the checking of version to ensure the servers isn't
                 * being inconsistent: for example initially negotiating with
                 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
                 * client_version in client hello and not resetting it to
                 * the negotiated version.
                 */
#if 0
                *(p++)=s->version>>8;
                *(p++)=s->version&0xff;
                s->client_version=s->version;
#else
                *(p++)=s->client_version>>8;
                *(p++)=s->client_version&0xff;
#endif

                /* 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 > (int)sizeof(s->session->session_id))
                                {
                                SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
                                goto err;
                                }
                        memcpy(p,s->session->session_id,i);
                        p+=i;
                        }
                
                /* Ciphers supported */
                i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
                if (i == 0)
                        {
                        SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
                        goto err;
                        }
#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
                        /* Some servers hang if client hello > 256 bytes
                         * as hack workaround chop number of supported ciphers
                         * to keep it well below this if we use TLS v1.2
                         */
                        if (TLS1_get_version(s) >= TLS1_2_VERSION
                                && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
                                i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
#endif
                s2n(i,p);
                p+=i;

                /* COMPRESSION */
#ifdef OPENSSL_NO_COMP
                *(p++)=1;
#else

                if ((s->options & SSL_OP_NO_COMPRESSION)
                                        || !s->ctx->comp_methods)
                        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;
                        }
#endif
                *(p++)=0; /* Add the NULL method */

#ifndef OPENSSL_NO_TLSEXT
                /* TLS extensions*/
                if (ssl_prepare_clienthello_tlsext(s) <= 0)
                        {
                        SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
                        goto err;
                        }
                if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
                        {
                        SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
                        goto err;
                        }
#endif
                
                l=(p-d);
                d=buf;
                *(d++)=SSL3_MT_CLIENT_HELLO;
                l2n3(l,d);

                s->state=SSL3_ST_CW_CLNT_HELLO_B;
                /* number of bytes to write */
                s->init_num=p-buf;
                s->init_off=0;
                }

        /* SSL3_ST_CW_CLNT_HELLO_B */
        return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
err:
        return(-1);
        }

int ssl3_get_server_hello(SSL *s)
        {
        STACK_OF(SSL_CIPHER) *sk;
        const SSL_CIPHER *c;
        CERT *ct = s->cert;
        unsigned char *p,*d;
        int i,al=SSL_AD_INTERNAL_ERROR,ok;
        unsigned int j;
        long n;
#ifndef OPENSSL_NO_COMP
        SSL_COMP *comp;
#endif

        n=s->method->ssl_get_message(s,
                SSL3_ST_CR_SRVR_HELLO_A,
                SSL3_ST_CR_SRVR_HELLO_B,
                -1,
                20000, /* ?? */
                &ok);

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

        if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
                {
                if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
                        {
                        if ( s->d1->send_cookie == 0)
                                {
                                s->s3->tmp.reuse_message = 1;
                                return 1;
                                }
                        else /* already sent a cookie */
                                {
                                al=SSL_AD_UNEXPECTED_MESSAGE;
                                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
                                goto f_err;
                                }
                        }
                }
        
        if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
                {
                al=SSL_AD_UNEXPECTED_MESSAGE;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
                goto f_err;
                }

        d=p=(unsigned char *)s->init_msg;

        if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
                {
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
                s->version=(s->version&0xff00)|p[1];
                al=SSL_AD_PROTOCOL_VERSION;
                goto f_err;
                }
        p+=2;

        /* load the server hello data */
        /* load the server random */
        memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
        p+=SSL3_RANDOM_SIZE;

        /* get the session-id */
        j= *(p++);

        if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
                {
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
                goto f_err;
                }

#ifndef OPENSSL_NO_TLSEXT
        /* check if we want to resume the session based on external pre-shared secret */
        if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
                {
                SSL_CIPHER *pref_cipher=NULL;
                s->session->master_key_length=sizeof(s->session->master_key);
                if (s->tls_session_secret_cb(s, s->session->master_key,
                                             &s->session->master_key_length,
                                             NULL, &pref_cipher,
                                             s->tls_session_secret_cb_arg))
                        {
                        s->session->cipher = pref_cipher ?
                                pref_cipher : ssl_get_cipher_by_char(s, p+j);
                        }
                }
#endif /* OPENSSL_NO_TLSEXT */

        if (j != 0 && j == s->session->session_id_length
            && memcmp(p,s->session->session_id,j) == 0)
            {
            if(s->sid_ctx_length != s->session->sid_ctx_length
               || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
                {
                /* actually a client application bug */
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
                goto f_err;
                }
            s->hit=1;
            }
        else    /* a miss or crap from the other end */
                {
                /* If we were trying for session-id reuse, make a new
                 * SSL_SESSION so we don't stuff up other people */
                s->hit=0;
                if (s->session->session_id_length > 0)
                        {
                        if (!ssl_get_new_session(s,0))
                                {
                                goto f_err;
                                }
                        }
                s->session->session_id_length=j;
                memcpy(s->session->session_id,p,j); /* j could be 0 */
                }
        p+=j;
        c=ssl_get_cipher_by_char(s,p);
        if (c == NULL)
                {
                /* unknown cipher */
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
                goto f_err;
                }
        /* If it is a disabled cipher we didn't send it in client hello,
         * so return an error.
         */
        if (c->algorithm_ssl & ct->mask_ssl ||
                c->algorithm_mkey & ct->mask_k ||
                c->algorithm_auth & ct->mask_a)
                {
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
                goto f_err;
                }
        p+=ssl_put_cipher_by_char(s,NULL,NULL);

        sk=ssl_get_ciphers_by_id(s);
        i=sk_SSL_CIPHER_find(sk,c);
        if (i < 0)
                {
                /* we did not say we would use this cipher */
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
                goto f_err;
                }

        /* Depending on the session caching (internal/external), the cipher
           and/or cipher_id values may not be set. Make sure that
           cipher_id is set and use it for comparison. */
        if (s->session->cipher)
                s->session->cipher_id = s->session->cipher->id;
        if (s->hit && (s->session->cipher_id != c->id))
                {
/* Workaround is now obsolete */
#if 0
                if (!(s->options &
                        SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
#endif
                        {
                        al=SSL_AD_ILLEGAL_PARAMETER;
                        SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
                        goto f_err;
                        }
                }
        s->s3->tmp.new_cipher=c;
        /* Don't digest cached records if TLS v1.2: we may need them for
         * client authentication.
         */
        if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
                goto f_err;
        /* lets get the compression algorithm */
        /* COMPRESSION */
#ifdef OPENSSL_NO_COMP
        if (*(p++) != 0)
                {
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
                goto f_err;
                }
        /* If compression is disabled we'd better not try to resume a session
         * using compression.
         */
        if (s->session->compress_meth != 0)
                {
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
                goto f_err;
                }
#else
        j= *(p++);
        if (s->hit && j != s->session->compress_meth)
                {
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
                goto f_err;
                }
        if (j == 0)
                comp=NULL;
        else if (s->options & SSL_OP_NO_COMPRESSION)
                {
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
                goto f_err;
                }
        else
                comp=ssl3_comp_find(s->ctx->comp_methods,j);
        
        if ((j != 0) && (comp == NULL))
                {
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
                goto f_err;
                }
        else
                {
                s->s3->tmp.new_compression=comp;
                }
#endif

#ifndef OPENSSL_NO_TLSEXT
        /* TLS extensions*/
        if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
                {
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
                goto err; 
                }
#endif

        if (p != (d+n))
                {
                /* wrong packet length */
                al=SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
                goto f_err;
                }

        return(1);
f_err:
        ssl3_send_alert(s,SSL3_AL_FATAL,al);
err:
        return(-1);
        }

int ssl3_get_server_certificate(SSL *s)
        {
        int al,i,ok,ret= -1;
        unsigned long n,nc,llen,l;
        X509 *x=NULL;
        const unsigned char *q,*p;
        unsigned char *d;
        STACK_OF(X509) *sk=NULL;
        SESS_CERT *sc;
        EVP_PKEY *pkey=NULL;
        int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */

        n=s->method->ssl_get_message(s,
                SSL3_ST_CR_CERT_A,
                SSL3_ST_CR_CERT_B,
                -1,
                s->max_cert_list,
                &ok);

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

        if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
                ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) && 
                (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
                {
                s->s3->tmp.reuse_message=1;
                return(1);
                }

        if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
                {
                al=SSL_AD_UNEXPECTED_MESSAGE;
                SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
                goto f_err;
                }
        p=d=(unsigned char *)s->init_msg;

        if ((sk=sk_X509_new_null()) == NULL)
                {
                SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
                goto err;
                }

        n2l3(p,llen);
        if (llen+3 != n)
                {
                al=SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
                goto f_err;
                }
        for (nc=0; nc<llen; )
                {
                n2l3(p,l);
                if ((l+nc+3) > llen)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
                        goto f_err;
                        }

                q=p;
                x=d2i_X509(NULL,&q,l);
                if (x == NULL)
                        {
                        al=SSL_AD_BAD_CERTIFICATE;
                        SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
                        goto f_err;
                        }
                if (q != (p+l))
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
                        goto f_err;
                        }
                if (!sk_X509_push(sk,x))
                        {
                        SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
                        goto err;
                        }
                x=NULL;
                nc+=l+3;
                p=q;
                }

        i=ssl_verify_cert_chain(s,sk);
        if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
#ifndef OPENSSL_NO_KRB5
            && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
#endif /* OPENSSL_NO_KRB5 */
                )
                {
                al=ssl_verify_alarm_type(s->verify_result);
                SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
                goto f_err; 
                }
        ERR_clear_error(); /* but we keep s->verify_result */

        sc=ssl_sess_cert_new();
        if (sc == NULL) goto err;

        if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
        s->session->sess_cert=sc;

        sc->cert_chain=sk;
        /* Inconsistency alert: cert_chain does include the peer's
         * certificate, which we don't include in s3_srvr.c */
        x=sk_X509_value(sk,0);
        sk=NULL;
        /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/

        pkey=X509_get_pubkey(x);

        /* VRS: allow null cert if auth == KRB5 */
        need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
                    (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
                    ? 0 : 1;

#ifdef KSSL_DEBUG
        printf("pkey,x = %p, %p\n", pkey,x);
        printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
        printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
                s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
#endif    /* KSSL_DEBUG */

        if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
                {
                x=NULL;
                al=SSL3_AL_FATAL;
                SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
                        SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
                goto f_err;
                }

        i=ssl_cert_type(x,pkey);
        if (need_cert && i < 0)
                {
                x=NULL;
                al=SSL3_AL_FATAL;
                SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
                        SSL_R_UNKNOWN_CERTIFICATE_TYPE);
                goto f_err;
                }

        if (need_cert)
                {
                sc->peer_cert_type=i;
                CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
                /* Why would the following ever happen?
                 * We just created sc a couple of lines ago. */
                if (sc->peer_pkeys[i].x509 != NULL)
                        X509_free(sc->peer_pkeys[i].x509);
                sc->peer_pkeys[i].x509=x;
                sc->peer_key= &(sc->peer_pkeys[i]);

                if (s->session->peer != NULL)
                        X509_free(s->session->peer);
                CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
                s->session->peer=x;
                }
        else
                {
                sc->peer_cert_type=i;
                sc->peer_key= NULL;

                if (s->session->peer != NULL)
                        X509_free(s->session->peer);
                s->session->peer=NULL;
                }
        s->session->verify_result = s->verify_result;

        x=NULL;
#ifndef OPENSSL_NO_TLSEXT
        /* Check the audit proof. */
        if (s->ctx->tlsext_authz_server_audit_proof_cb)
                {
                ret = s->ctx->tlsext_authz_server_audit_proof_cb(s,
                        s->ctx->tlsext_authz_server_audit_proof_cb_arg);
                if (ret <= 0)
                        {
                        al = SSL_AD_BAD_CERTIFICATE;
                        SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_INVALID_AUDIT_PROOF);
                        goto f_err;
                        }
                }

#endif
        ret=1;
        if (0)
                {
f_err:
                ssl3_send_alert(s,SSL3_AL_FATAL,al);
                }
err:
        EVP_PKEY_free(pkey);
        X509_free(x);
        sk_X509_pop_free(sk,X509_free);
        return(ret);
        }

int ssl3_get_key_exchange(SSL *s)
        {
#ifndef OPENSSL_NO_RSA
        unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
#endif
        EVP_MD_CTX md_ctx;
        unsigned char *param,*p;
        int al,i,j,param_len,ok;
        long n,alg_k,alg_a;
        EVP_PKEY *pkey=NULL;
        const EVP_MD *md = NULL;
#ifndef OPENSSL_NO_RSA
        RSA *rsa=NULL;
#endif
#ifndef OPENSSL_NO_DH
        DH *dh=NULL;
#endif
#ifndef OPENSSL_NO_ECDH
        EC_KEY *ecdh = NULL;
        BN_CTX *bn_ctx = NULL;
        EC_POINT *srvr_ecpoint = NULL;
        int curve_nid = 0;
        int encoded_pt_len = 0;
#endif

        /* use same message size as in ssl3_get_certificate_request()
         * as ServerKeyExchange message may be skipped */
        n=s->method->ssl_get_message(s,
                SSL3_ST_CR_KEY_EXCH_A,
                SSL3_ST_CR_KEY_EXCH_B,
                -1,
                s->max_cert_list,
                &ok);
        if (!ok) return((int)n);

        if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
                {
#ifndef OPENSSL_NO_PSK
                /* In plain PSK ciphersuite, ServerKeyExchange can be
                   omitted if no identity hint is sent. Set
                   session->sess_cert anyway to avoid problems
                   later.*/
                if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
                        {
                        s->session->sess_cert=ssl_sess_cert_new();
                        if (s->ctx->psk_identity_hint)
                                OPENSSL_free(s->ctx->psk_identity_hint);
                        s->ctx->psk_identity_hint = NULL;
                        }
#endif
                s->s3->tmp.reuse_message=1;
                return(1);
                }

        param=p=(unsigned char *)s->init_msg;
        if (s->session->sess_cert != NULL)
                {
#ifndef OPENSSL_NO_RSA
                if (s->session->sess_cert->peer_rsa_tmp != NULL)
                        {
                        RSA_free(s->session->sess_cert->peer_rsa_tmp);
                        s->session->sess_cert->peer_rsa_tmp=NULL;
                        }
#endif
#ifndef OPENSSL_NO_DH
                if (s->session->sess_cert->peer_dh_tmp)
                        {
                        DH_free(s->session->sess_cert->peer_dh_tmp);
                        s->session->sess_cert->peer_dh_tmp=NULL;
                        }
#endif
#ifndef OPENSSL_NO_ECDH
                if (s->session->sess_cert->peer_ecdh_tmp)
                        {
                        EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
                        s->session->sess_cert->peer_ecdh_tmp=NULL;
                        }
#endif
                }
        else
                {
                s->session->sess_cert=ssl_sess_cert_new();
                }

        param_len=0;
        alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
        alg_a=s->s3->tmp.new_cipher->algorithm_auth;
        EVP_MD_CTX_init(&md_ctx);

#ifndef OPENSSL_NO_PSK
        if (alg_k & SSL_kPSK)
                {
                char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];

                al=SSL_AD_HANDSHAKE_FAILURE;
                n2s(p,i);
                param_len=i+2;
                /* Store PSK identity hint for later use, hint is used
                 * in ssl3_send_client_key_exchange.  Assume that the
                 * maximum length of a PSK identity hint can be as
                 * long as the maximum length of a PSK identity. */
                if (i > PSK_MAX_IDENTITY_LEN)
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
                                SSL_R_DATA_LENGTH_TOO_LONG);
                        goto f_err;
                        }
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
                                SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
                        goto f_err;
                        }
                /* If received PSK identity hint contains NULL
                 * characters, the hint is truncated from the first
                 * NULL. p may not be ending with NULL, so create a
                 * NULL-terminated string. */
                memcpy(tmp_id_hint, p, i);
                memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
                if (s->ctx->psk_identity_hint != NULL)
                        OPENSSL_free(s->ctx->psk_identity_hint);
                s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
                if (s->ctx->psk_identity_hint == NULL)
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
                        goto f_err;
                        }          

                p+=i;
                n-=param_len;
                }
        else
#endif /* !OPENSSL_NO_PSK */
#ifndef OPENSSL_NO_SRP
        if (alg_k & SSL_kSRP)
                {
                n2s(p,i);
                param_len=i+2;
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
                        goto f_err;
                        }
                if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
                        goto err;
                        }
                p+=i;

                n2s(p,i);
                param_len+=i+2;
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
                        goto f_err;
                        }
                if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
                        goto err;
                        }
                p+=i;

                i = (unsigned int)(p[0]);
                p++;
                param_len+=i+1;
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
                        goto f_err;
                        }
                if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
                        goto err;
                        }
                p+=i;

                n2s(p,i);
                param_len+=i+2;
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
                        goto f_err;
                        }
                if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
                        goto err;
                        }
                p+=i;
                n-=param_len;

/* We must check if there is a certificate */
#ifndef OPENSSL_NO_RSA
                if (alg_a & SSL_aRSA)
                        pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
#else
                if (0)
                        ;
#endif
#ifndef OPENSSL_NO_DSA
                else if (alg_a & SSL_aDSS)
                        pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
#endif
                }
        else
#endif /* !OPENSSL_NO_SRP */
#ifndef OPENSSL_NO_RSA
        if (alg_k & SSL_kRSA)
                {
                if ((rsa=RSA_new()) == NULL)
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
                        goto err;
                        }
                n2s(p,i);
                param_len=i+2;
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
                        goto f_err;
                        }
                if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
                        goto err;
                        }
                p+=i;

                n2s(p,i);
                param_len+=i+2;
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
                        goto f_err;
                        }
                if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
                        goto err;
                        }
                p+=i;
                n-=param_len;

                /* this should be because we are using an export cipher */
                if (alg_a & SSL_aRSA)
                        pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
                else
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
                        goto err;
                        }
                s->session->sess_cert->peer_rsa_tmp=rsa;
                rsa=NULL;
                }
#else /* OPENSSL_NO_RSA */
        if (0)
                ;
#endif
#ifndef OPENSSL_NO_DH
        else if (alg_k & SSL_kEDH)
                {
                if ((dh=DH_new()) == NULL)
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
                        goto err;
                        }
                n2s(p,i);
                param_len=i+2;
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
                        goto f_err;
                        }
                if (!(dh->p=BN_bin2bn(p,i,NULL)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
                        goto err;
                        }
                p+=i;

                n2s(p,i);
                param_len+=i+2;
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
                        goto f_err;
                        }
                if (!(dh->g=BN_bin2bn(p,i,NULL)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
                        goto err;
                        }
                p+=i;

                n2s(p,i);
                param_len+=i+2;
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
                        goto f_err;
                        }
                if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
                        goto err;
                        }
                p+=i;
                n-=param_len;

#ifndef OPENSSL_NO_RSA
                if (alg_a & SSL_aRSA)
                        pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
#else
                if (0)
                        ;
#endif
#ifndef OPENSSL_NO_DSA
                else if (alg_a & SSL_aDSS)
                        pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
#endif
                /* else anonymous DH, so no certificate or pkey. */

                s->session->sess_cert->peer_dh_tmp=dh;
                dh=NULL;
                }
        else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
                {
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
                goto f_err;
                }
#endif /* !OPENSSL_NO_DH */

#ifndef OPENSSL_NO_ECDH
        else if (alg_k & SSL_kEECDH)
                {
                EC_GROUP *ngroup;
                const EC_GROUP *group;

                if ((ecdh=EC_KEY_new()) == NULL)
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
                        goto err;
                        }

                /* Extract elliptic curve parameters and the
                 * server's ephemeral ECDH public key.
                 * Keep accumulating lengths of various components in
                 * param_len and make sure it never exceeds n.
                 */

                /* XXX: For now we only support named (not generic) curves
                 * and the ECParameters in this case is just three bytes.
                 */
                param_len=3;
                /* Check curve is one of our prefrences, if not server has
                 * sent an invalid curve.
                 */
                if (!tls1_check_curve(s, p, param_len))
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
                        goto f_err;
                        }

                if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0) 
                        {
                        al=SSL_AD_INTERNAL_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
                        goto f_err;
                        }

                ngroup = EC_GROUP_new_by_curve_name(curve_nid);
                if (ngroup == NULL)
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
                        goto err;
                        }
                if (EC_KEY_set_group(ecdh, ngroup) == 0)
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
                        goto err;
                        }
                EC_GROUP_free(ngroup);

                group = EC_KEY_get0_group(ecdh);

                if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
                    (EC_GROUP_get_degree(group) > 163))
                        {
                        al=SSL_AD_EXPORT_RESTRICTION;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
                        goto f_err;
                        }

                p+=3;

                /* Next, get the encoded ECPoint */
                if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
                    ((bn_ctx = BN_CTX_new()) == NULL))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
                        goto err;
                        }

                encoded_pt_len = *p;  /* length of encoded point */
                p+=1;
                param_len += (1 + encoded_pt_len);
                if ((param_len > n) ||
                    (EC_POINT_oct2point(group, srvr_ecpoint, 
                        p, encoded_pt_len, bn_ctx) == 0))
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
                        goto f_err;
                        }

                n-=param_len;
                p+=encoded_pt_len;

                /* The ECC/TLS specification does not mention
                 * the use of DSA to sign ECParameters in the server
                 * key exchange message. We do support RSA and ECDSA.
                 */
                if (0) ;
#ifndef OPENSSL_NO_RSA
                else if (alg_a & SSL_aRSA)
                        pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
#endif
#ifndef OPENSSL_NO_ECDSA
                else if (alg_a & SSL_aECDSA)
                        pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
#endif
                /* else anonymous ECDH, so no certificate or pkey. */
                EC_KEY_set_public_key(ecdh, srvr_ecpoint);
                s->session->sess_cert->peer_ecdh_tmp=ecdh;
                ecdh=NULL;
                BN_CTX_free(bn_ctx);
                bn_ctx = NULL;
                EC_POINT_free(srvr_ecpoint);
                srvr_ecpoint = NULL;
                }
        else if (alg_k)
                {
                al=SSL_AD_UNEXPECTED_MESSAGE;
                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
                goto f_err;
                }
#endif /* !OPENSSL_NO_ECDH */


        /* p points to the next byte, there are 'n' bytes left */

        /* if it was signed, check the signature */
        if (pkey != NULL)
                {
                if (TLS1_get_version(s) >= TLS1_2_VERSION)
                        {
                        int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
                        if (rv == -1)
                                goto err;
                        else if (rv == 0)
                                {
                                al = SSL_AD_DECODE_ERROR;
                                goto f_err;
                                }
#ifdef SSL_DEBUG
fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
#endif
                        p += 2;
                        n -= 2;
                        }
                else
                        md = EVP_sha1();
                        
                n2s(p,i);
                n-=2;
                j=EVP_PKEY_size(pkey);

                if ((i != n) || (n > j) || (n <= 0))
                        {
                        /* wrong packet length */
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
                        goto f_err;
                        }

#ifndef OPENSSL_NO_RSA
                if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
                        {
                        int num;

                        j=0;
                        q=md_buf;
                        for (num=2; num > 0; num--)
                                {
                                EVP_MD_CTX_set_flags(&md_ctx,
                                        EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
                                EVP_DigestInit_ex(&md_ctx,(num == 2)
                                        ?s->ctx->md5:s->ctx->sha1, NULL);
                                EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
                                EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
                                EVP_DigestUpdate(&md_ctx,param,param_len);
                                EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
                                q+=i;
                                j+=i;
                                }
                        i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
                                                                pkey->pkey.rsa);
                        if (i < 0)
                                {
                                al=SSL_AD_DECRYPT_ERROR;
                                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
                                goto f_err;
                                }
                        if (i == 0)
                                {
                                /* bad signature */
                                al=SSL_AD_DECRYPT_ERROR;
                                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
                                goto f_err;
                                }
                        }
                else
#endif
                        {
                        EVP_VerifyInit_ex(&md_ctx, md, NULL);
                        EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
                        EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
                        EVP_VerifyUpdate(&md_ctx,param,param_len);
                        if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
                                {
                                /* bad signature */
                                al=SSL_AD_DECRYPT_ERROR;
                                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
                                goto f_err;
                                }
                        }
                }
        else
                {
                if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
                        /* aNULL or kPSK do not need public keys */
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
                        goto err;
                        }
                /* still data left over */
                if (n != 0)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
                        goto f_err;
                        }
                }
        EVP_PKEY_free(pkey);
        EVP_MD_CTX_cleanup(&md_ctx);
        return(1);
f_err:
        ssl3_send_alert(s,SSL3_AL_FATAL,al);
err:
        EVP_PKEY_free(pkey);
#ifndef OPENSSL_NO_RSA
        if (rsa != NULL)
                RSA_free(rsa);
#endif
#ifndef OPENSSL_NO_DH
        if (dh != NULL)
                DH_free(dh);
#endif
#ifndef OPENSSL_NO_ECDH
        BN_CTX_free(bn_ctx);
        EC_POINT_free(srvr_ecpoint);
        if (ecdh != NULL)
                EC_KEY_free(ecdh);
#endif
        EVP_MD_CTX_cleanup(&md_ctx);
        return(-1);
        }

int ssl3_get_certificate_request(SSL *s)
        {
        int ok,ret=0;
        unsigned long n,nc,l;
        unsigned int llen, ctype_num,i;
        X509_NAME *xn=NULL;
        const unsigned char *p,*q;
        unsigned char *d;
        STACK_OF(X509_NAME) *ca_sk=NULL;

        n=s->method->ssl_get_message(s,
                SSL3_ST_CR_CERT_REQ_A,
                SSL3_ST_CR_CERT_REQ_B,
                -1,
                s->max_cert_list,
                &ok);

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

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

        if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
                {
                s->s3->tmp.reuse_message=1;
                /* If we get here we don't need any cached handshake records
                 * as we wont be doing client auth.
                 */
                if (s->s3->handshake_buffer)
                        {
                        if (!ssl3_digest_cached_records(s))
                                goto err;
                        }
                return(1);
                }

        if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
                {
                ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
                SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
                goto err;
                }

        /* TLS does not like anon-DH with client cert */
        if (s->version > SSL3_VERSION)
                {
                if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
                        {
                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
                        SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
                        goto err;
                        }
                }

        p=d=(unsigned char *)s->init_msg;

        if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
                {
                SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
                goto err;
                }

        /* get the certificate types */
        ctype_num= *(p++);
        if (s->cert->ctypes)
                {
                OPENSSL_free(s->cert->ctypes);
                s->cert->ctypes = NULL;
                }
        if (ctype_num > SSL3_CT_NUMBER)
                {
                /* If we exceed static buffer copy all to cert structure */
                s->cert->ctypes = OPENSSL_malloc(ctype_num);
                memcpy(s->cert->ctypes, p, ctype_num);
                s->cert->ctype_num = (size_t)ctype_num;
                ctype_num=SSL3_CT_NUMBER;
                }
        for (i=0; i<ctype_num; i++)
                s->s3->tmp.ctype[i]= p[i];
        p+=p[-1];
        if (TLS1_get_version(s) >= TLS1_2_VERSION)
                {
                n2s(p, llen);
                /* Check we have enough room for signature algorithms and
                 * following length value.
                 */
                if ((unsigned long)(p - d + llen + 2) > n)
                        {
                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
                        SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
                        goto err;
                        }
                /* Clear certificate digests and validity flags */
                for (i = 0; i < SSL_PKEY_NUM; i++)
                        {
                        s->cert->pkeys[i].digest = NULL;
                        s->cert->pkeys[i].valid_flags = 0;
                        }
                if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
                        {
                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
                        SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
                        goto err;
                        }
                p += llen;
                }

        /* get the CA RDNs */
        n2s(p,llen);
#if 0
{
FILE *out;
out=fopen("/tmp/vsign.der","w");
fwrite(p,1,llen,out);
fclose(out);
}
#endif

        if ((unsigned long)(p - d + llen) != n)
                {
                ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
                SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
                goto err;
                }

        for (nc=0; nc<llen; )
                {
                n2s(p,l);
                if ((l+nc+2) > llen)
                        {
                        if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
                                goto cont; /* netscape bugs */
                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
                        SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
                        goto err;
                        }

                q=p;

                if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
                        {
                        /* If netscape tolerance is on, ignore errors */
                        if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
                                goto cont;
                        else
                                {
                                ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
                                SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
                                goto err;
                                }
                        }

                if (q != (p+l))
                        {
                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
                        SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
                        goto err;
                        }
                if (!sk_X509_NAME_push(ca_sk,xn))
                        {
                        SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
                        goto err;
                        }

                p+=l;
                nc+=l+2;
                }

        if (0)
                {
cont:
                ERR_clear_error();
                }

        /* we should setup a certificate to return.... */
        s->s3->tmp.cert_req=1;
        s->s3->tmp.ctype_num=ctype_num;
        if (s->s3->tmp.ca_names != NULL)
                sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
        s->s3->tmp.ca_names=ca_sk;
        ca_sk=NULL;

        ret=1;
err:
        if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
        return(ret);
        }

static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
        {
        return(X509_NAME_cmp(*a,*b));
        }
#ifndef OPENSSL_NO_TLSEXT
int ssl3_get_new_session_ticket(SSL *s)
        {
        int ok,al,ret=0, ticklen;
        long n;
        const unsigned char *p;
        unsigned char *d;

        n=s->method->ssl_get_message(s,
                SSL3_ST_CR_SESSION_TICKET_A,
                SSL3_ST_CR_SESSION_TICKET_B,
                -1,
                16384,
                &ok);

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

        if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
                {
                s->s3->tmp.reuse_message=1;
                return(1);
                }
        if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
                {
                al=SSL_AD_UNEXPECTED_MESSAGE;
                SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
                goto f_err;
                }
        if (n < 6)
                {
                /* need at least ticket_lifetime_hint + ticket length */
                al = SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
                goto f_err;
                }

        p=d=(unsigned char *)s->init_msg;
        n2l(p, s->session->tlsext_tick_lifetime_hint);
        n2s(p, ticklen);
        /* ticket_lifetime_hint + ticket_length + ticket */
        if (ticklen + 6 != n)
                {
                al = SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
                goto f_err;
                }
        if (s->session->tlsext_tick)
                {
                OPENSSL_free(s->session->tlsext_tick);
                s->session->tlsext_ticklen = 0;
                }
        s->session->tlsext_tick = OPENSSL_malloc(ticklen);
        if (!s->session->tlsext_tick)
                {
                SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
                goto err;
                }
        memcpy(s->session->tlsext_tick, p, ticklen);
        s->session->tlsext_ticklen = ticklen;
        /* There are two ways to detect a resumed ticket sesion.
         * One is to set an appropriate session ID and then the server
         * must return a match in ServerHello. This allows the normal
         * client session ID matching to work and we know much 
         * earlier that the ticket has been accepted.
         * 
         * The other way is to set zero length session ID when the
         * ticket is presented and rely on the handshake to determine
         * session resumption.
         *
         * We choose the former approach because this fits in with
         * assumptions elsewhere in OpenSSL. The session ID is set
         * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
         * ticket.
         */ 
        EVP_Digest(p, ticklen,
                        s->session->session_id, &s->session->session_id_length,
#ifndef OPENSSL_NO_SHA256
                                                        EVP_sha256(), NULL);
#else
                                                        EVP_sha1(), NULL);
#endif
        ret=1;
        return(ret);
f_err:
        ssl3_send_alert(s,SSL3_AL_FATAL,al);
err:
        return(-1);
        }

int ssl3_get_cert_status(SSL *s)
        {
        int ok, al;
        unsigned long resplen,n;
        const unsigned char *p;

        n=s->method->ssl_get_message(s,
                SSL3_ST_CR_CERT_STATUS_A,
                SSL3_ST_CR_CERT_STATUS_B,
                SSL3_MT_CERTIFICATE_STATUS,
                16384,
                &ok);

        if (!ok) return((int)n);
        if (n < 4)
                {
                /* need at least status type + length */
                al = SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
                goto f_err;
                }
        p = (unsigned char *)s->init_msg;
        if (*p++ != TLSEXT_STATUSTYPE_ocsp)
                {
                al = SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
                goto f_err;
                }
        n2l3(p, resplen);
        if (resplen + 4 != n)
                {
                al = SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
                goto f_err;
                }
        if (s->tlsext_ocsp_resp)
                OPENSSL_free(s->tlsext_ocsp_resp);
        s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
        if (!s->tlsext_ocsp_resp)
                {
                al = SSL_AD_INTERNAL_ERROR;
                SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
                goto f_err;
                }
        s->tlsext_ocsp_resplen = resplen;
        if (s->ctx->tlsext_status_cb)
                {
                int ret;
                ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
                if (ret == 0)
                        {
                        al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
                        SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
                        goto f_err;
                        }
                if (ret < 0)
                        {
                        al = SSL_AD_INTERNAL_ERROR;
                        SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
                        goto f_err;
                        }
                }
        return 1;
f_err:
        ssl3_send_alert(s,SSL3_AL_FATAL,al);
        return(-1);
        }
#endif

int ssl3_get_server_done(SSL *s)
        {
        int ok,ret=0;
        long n;

        n=s->method->ssl_get_message(s,
                SSL3_ST_CR_SRVR_DONE_A,
                SSL3_ST_CR_SRVR_DONE_B,
                SSL3_MT_SERVER_DONE,
                30, /* should be very small, like 0 :-) */
                &ok);

        if (!ok) return((int)n);
        if (n > 0)
                {
                /* should contain no data */
                ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
                SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
                return -1;
                }
        ret=1;
        return(ret);
        }


int ssl3_send_client_key_exchange(SSL *s)
        {
        unsigned char *p,*d;
        int n;
        unsigned long alg_k;
#ifndef OPENSSL_NO_RSA
        unsigned char *q;
        EVP_PKEY *pkey=NULL;
#endif
#ifndef OPENSSL_NO_KRB5
        KSSL_ERR kssl_err;
#endif /* OPENSSL_NO_KRB5 */
#ifndef OPENSSL_NO_ECDH
        EC_KEY *clnt_ecdh = NULL;
        const EC_POINT *srvr_ecpoint = NULL;
        EVP_PKEY *srvr_pub_pkey = NULL;
        unsigned char *encodedPoint = NULL;
        int encoded_pt_len = 0;
        BN_CTX * bn_ctx = NULL;
#endif

        if (s->state == SSL3_ST_CW_KEY_EXCH_A)
                {
                d=(unsigned char *)s->init_buf->data;
                p= &(d[4]);

                alg_k=s->s3->tmp.new_cipher->algorithm_mkey;

                /* Fool emacs indentation */
                if (0) {}
#ifndef OPENSSL_NO_RSA
                else if (alg_k & 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_SSL3_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 beyond */
                        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_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
                                goto err;
                                }

                        /* Fix buf for TLS and beyond */
                        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 (alg_k & 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;
                        const 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",
                                alg_k, 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_SSL3_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;
                                }
 
                            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;

                        /*  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 > (int)sizeof epms)
                                {
                                SSLerr(SSL_F_SSL3_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 (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
                        {
                        DH *dh_srvr,*dh_clnt;
                        SESS_CERT *scert = s->session->sess_cert;

                        if (scert == NULL) 
                                {
                                ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
                                goto err;
                                }

                        if (scert->peer_dh_tmp != NULL)
                                dh_srvr=scert->peer_dh_tmp;
                        else
                                {
                                /* we get them from the cert */
                                int idx = scert->peer_cert_type;
                                EVP_PKEY *spkey = NULL;
                                dh_srvr = NULL;
                                if (idx >= 0)
                                        spkey = X509_get_pubkey(
                                                scert->peer_pkeys[idx].x509);
                                if (spkey)
                                        {
                                        dh_srvr = EVP_PKEY_get1_DH(spkey);
                                        EVP_PKEY_free(spkey);
                                        }
                                if (dh_srvr == NULL)
                                        {
                                        SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
                                            ERR_R_INTERNAL_ERROR);
                                        goto err;
                                        }
                                }
                        if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
                                {
                                /* Use client certificate key */
                                EVP_PKEY *clkey = s->cert->key->privatekey;
                                dh_clnt = NULL;
                                if (clkey)
                                        dh_clnt = EVP_PKEY_get1_DH(clkey);
                                if (dh_clnt == NULL)
                                        {
                                        SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
                                            ERR_R_INTERNAL_ERROR);
                                        goto err;
                                        }
                                }
                        else
                                {
                                /* generate a new random key */
                                if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
                                        {
                                        SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
                                        goto err;
                                        }
                                if (!DH_generate_key(dh_clnt))
                                        {
                                        SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
                                        DH_free(dh_clnt);
                                        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 (scert->peer_dh_tmp == NULL)
                                DH_free(dh_srvr);

                        if (n <= 0)
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
                                DH_free(dh_clnt);
                                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);

                        if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
                                n = 0;
                        else
                                {
                                /* 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

#ifndef OPENSSL_NO_ECDH 
                else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
                        {
                        const EC_GROUP *srvr_group = NULL;
                        EC_KEY *tkey;
                        int ecdh_clnt_cert = 0;
                        int field_size = 0;

                        /* Did we send out the client's
                         * ECDH share for use in premaster
                         * computation as part of client certificate?
                         * If so, set ecdh_clnt_cert to 1.
                         */
                        if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
                                {
                                /* XXX: For now, we do not support client
                                 * authentication using ECDH certificates.
                                 * To add such support, one needs to add
                                 * code that checks for appropriate 
                                 * conditions and sets ecdh_clnt_cert to 1.
                                 * For example, the cert have an ECC
                                 * key on the same curve as the server's
                                 * and the key should be authorized for
                                 * key agreement.
                                 *
                                 * One also needs to add code in ssl3_connect
                                 * to skip sending the certificate verify
                                 * message.
                                 *
                                 * if ((s->cert->key->privatekey != NULL) &&
                                 *     (s->cert->key->privatekey->type ==
                                 *      EVP_PKEY_EC) && ...)
                                 * ecdh_clnt_cert = 1;
                                 */
                                }

                        if (s->session->sess_cert->peer_ecdh_tmp != NULL)
                                {
                                tkey = s->session->sess_cert->peer_ecdh_tmp;
                                }
                        else
                                {
                                /* Get the Server Public Key from Cert */
                                srvr_pub_pkey = X509_get_pubkey(s->session-> \
                                    sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
                                if ((srvr_pub_pkey == NULL) ||
                                    (srvr_pub_pkey->type != EVP_PKEY_EC) ||
                                    (srvr_pub_pkey->pkey.ec == NULL))
                                        {
                                        SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
                                            ERR_R_INTERNAL_ERROR);
                                        goto err;
                                        }

                                tkey = srvr_pub_pkey->pkey.ec;
                                }

                        srvr_group   = EC_KEY_get0_group(tkey);
                        srvr_ecpoint = EC_KEY_get0_public_key(tkey);

                        if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
                                    ERR_R_INTERNAL_ERROR);
                                goto err;
                                }

                        if ((clnt_ecdh=EC_KEY_new()) == NULL) 
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
                                goto err;
                                }

                        if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
                                goto err;
                                }
                        if (ecdh_clnt_cert) 
                                { 
                                /* Reuse key info from our certificate
                                 * We only need our private key to perform
                                 * the ECDH computation.
                                 */
                                const BIGNUM *priv_key;
                                tkey = s->cert->key->privatekey->pkey.ec;
                                priv_key = EC_KEY_get0_private_key(tkey);
                                if (priv_key == NULL)
                                        {
                                        SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
                                        goto err;
                                        }
                                if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
                                        {
                                        SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
                                        goto err;
                                        }
                                }
                        else 
                                {
                                /* Generate a new ECDH key pair */
                                if (!(EC_KEY_generate_key(clnt_ecdh)))
                                        {
                                        SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
                                        goto err;
                                        }
                                }

                        /* use the 'p' output buffer for the ECDH key, but
                         * make sure to clear it out afterwards
                         */

                        field_size = EC_GROUP_get_degree(srvr_group);
                        if (field_size <= 0)
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
                                       ERR_R_ECDH_LIB);
                                goto err;
                                }
                        n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
                        if (n <= 0)
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
                                       ERR_R_ECDH_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);

                        memset(p, 0, n); /* clean up */

                        if (ecdh_clnt_cert) 
                                {
                                /* Send empty client key exch message */
                                n = 0;
                                }
                        else 
                                {
                                /* First check the size of encoding and
                                 * allocate memory accordingly.
                                 */
                                encoded_pt_len = 
                                    EC_POINT_point2oct(srvr_group, 
                                        EC_KEY_get0_public_key(clnt_ecdh), 
                                        POINT_CONVERSION_UNCOMPRESSED, 
                                        NULL, 0, NULL);

                                encodedPoint = (unsigned char *) 
                                    OPENSSL_malloc(encoded_pt_len * 
                                        sizeof(unsigned char)); 
                                bn_ctx = BN_CTX_new();
                                if ((encodedPoint == NULL) || 
                                    (bn_ctx == NULL)) 
                                        {
                                        SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
                                        goto err;
                                        }

                                /* Encode the public key */
                                n = EC_POINT_point2oct(srvr_group, 
                                    EC_KEY_get0_public_key(clnt_ecdh), 
                                    POINT_CONVERSION_UNCOMPRESSED, 
                                    encodedPoint, encoded_pt_len, bn_ctx);

                                *p = n; /* length of encoded point */
                                /* Encoded point will be copied here */
                                p += 1; 
                                /* copy the point */
                                memcpy((unsigned char *)p, encodedPoint, n);
                                /* increment n to account for length field */
                                n += 1; 
                                }

                        /* Free allocated memory */
                        BN_CTX_free(bn_ctx);
                        if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
                        if (clnt_ecdh != NULL) 
                                 EC_KEY_free(clnt_ecdh);
                        EVP_PKEY_free(srvr_pub_pkey);
                        }
#endif /* !OPENSSL_NO_ECDH */
                else if (alg_k & SSL_kGOST) 
                        {
                        /* GOST key exchange message creation */
                        EVP_PKEY_CTX *pkey_ctx;
                        X509 *peer_cert; 
                        size_t msglen;
                        unsigned int md_len;
                        int keytype;
                        unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
                        EVP_MD_CTX *ukm_hash;
                        EVP_PKEY *pub_key;

                        /* Get server sertificate PKEY and create ctx from it */
                        peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
                        if (!peer_cert) 
                                peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
                        if (!peer_cert)         {
                                        SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
                                        goto err;
                                }       
                                
                        pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
                        /* If we have send a certificate, and certificate key

                         * parameters match those of server certificate, use
                         * certificate key for key exchange
                         */

                         /* Otherwise, generate ephemeral key pair */
                                        
                        EVP_PKEY_encrypt_init(pkey_ctx);
                          /* Generate session key */    
                    RAND_bytes(premaster_secret,32);
                        /* If we have client certificate, use its secret as peer key */
                        if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
                                if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
                                        /* If there was an error - just ignore it. Ephemeral key
                                        * would be used
                                        */
                                        ERR_clear_error();
                                }
                        }                       
                        /* Compute shared IV and store it in algorithm-specific
                         * context data */
                        ukm_hash = EVP_MD_CTX_create();
                        EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
                        EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
                        EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
                        EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
                        EVP_MD_CTX_destroy(ukm_hash);
                        if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
                                8,shared_ukm)<0) {
                                        SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
                                                SSL_R_LIBRARY_BUG);
                                        goto err;
                                }       
                        /* Make GOST keytransport blob message */
                        /*Encapsulate it into sequence */
                        *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
                        msglen=255;
                        if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
                        SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
                                        SSL_R_LIBRARY_BUG);
                                goto err;
                        }
                        if (msglen >= 0x80)
                                {
                                *(p++)=0x81;
                                *(p++)= msglen & 0xff;
                                n=msglen+3;
                                }
                        else
                                {
                                *(p++)= msglen & 0xff;
                                n=msglen+2;
                                }
                        memcpy(p, tmp, msglen);
                        /* Check if pubkey from client certificate was used */
                        if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
                                {
                                /* Set flag "skip certificate verify" */
                                s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
                                }
                        EVP_PKEY_CTX_free(pkey_ctx);
                        s->session->master_key_length=
                                s->method->ssl3_enc->generate_master_secret(s,
                                        s->session->master_key,premaster_secret,32);
                        EVP_PKEY_free(pub_key);

                        }
#ifndef OPENSSL_NO_SRP
                else if (alg_k & SSL_kSRP)
                        {
                        if (s->srp_ctx.A != NULL)
                                {
                                /* send off the data */
                                n=BN_num_bytes(s->srp_ctx.A);
                                s2n(n,p);
                                BN_bn2bin(s->srp_ctx.A,p);
                                n+=2;
                                }
                        else
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
                                goto err;
                                }
                        if (s->session->srp_username != NULL)
                                OPENSSL_free(s->session->srp_username);
                        s->session->srp_username = BUF_strdup(s->srp_ctx.login);
                        if (s->session->srp_username == NULL)
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
                                        ERR_R_MALLOC_FAILURE);
                                goto err;
                                }

                        if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
                                goto err;
                                }
                        }
#endif
#ifndef OPENSSL_NO_PSK
                else if (alg_k & SSL_kPSK)
                        {
                        char identity[PSK_MAX_IDENTITY_LEN];
                        unsigned char *t = NULL;
                        unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
                        unsigned int pre_ms_len = 0, psk_len = 0;
                        int psk_err = 1;

                        n = 0;
                        if (s->psk_client_callback == NULL)
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
                                        SSL_R_PSK_NO_CLIENT_CB);
                                goto err;
                                }

                        psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
                                identity, PSK_MAX_IDENTITY_LEN,
                                psk_or_pre_ms, sizeof(psk_or_pre_ms));
                        if (psk_len > PSK_MAX_PSK_LEN)
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
                                        ERR_R_INTERNAL_ERROR);
                                goto psk_err;
                                }
                        else if (psk_len == 0)
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
                                goto psk_err;
                                }

                        /* create PSK pre_master_secret */
                        pre_ms_len = 2+psk_len+2+psk_len;
                        t = psk_or_pre_ms;
                        memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
                        s2n(psk_len, t);
                        memset(t, 0, psk_len);
                        t+=psk_len;
                        s2n(psk_len, t);

                        if (s->session->psk_identity_hint != NULL)
                                OPENSSL_free(s->session->psk_identity_hint);
                        s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
                        if (s->ctx->psk_identity_hint != NULL &&
                                s->session->psk_identity_hint == NULL)
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
                                        ERR_R_MALLOC_FAILURE);
                                goto psk_err;
                                }

                        if (s->session->psk_identity != NULL)
                                OPENSSL_free(s->session->psk_identity);
                        s->session->psk_identity = BUF_strdup(identity);
                        if (s->session->psk_identity == NULL)
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
                                        ERR_R_MALLOC_FAILURE);
                                goto psk_err;
                                }

                        s->session->master_key_length =
                                s->method->ssl3_enc->generate_master_secret(s,
                                        s->session->master_key,
                                        psk_or_pre_ms, pre_ms_len); 
                        n = strlen(identity);
                        s2n(n, p);
                        memcpy(p, identity, n);
                        n+=2;
                        psk_err = 0;
                psk_err:
                        OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
                        OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
                        if (psk_err != 0)
                                {
                                ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
                                goto err;
                                }
                        }
#endif
                else
                        {
                        ssl3_send_alert(s, SSL3_AL_FATAL,
                            SSL_AD_HANDSHAKE_FAILURE);
                        SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
                            ERR_R_INTERNAL_ERROR);
                        goto err;
                        }
                
                *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
                l2n3(n,d);

                s->state=SSL3_ST_CW_KEY_EXCH_B;
                /* number of bytes to write */
                s->init_num=n+4;
                s->init_off=0;
                }

        /* SSL3_ST_CW_KEY_EXCH_B */
        return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
err:
#ifndef OPENSSL_NO_ECDH
        BN_CTX_free(bn_ctx);
        if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
        if (clnt_ecdh != NULL) 
                EC_KEY_free(clnt_ecdh);
        EVP_PKEY_free(srvr_pub_pkey);
#endif
        return(-1);
        }

int ssl3_send_client_verify(SSL *s)
        {
        unsigned char *p,*d;
        unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
        EVP_PKEY *pkey;
        EVP_PKEY_CTX *pctx=NULL;
        EVP_MD_CTX mctx;
        unsigned u=0;
        unsigned long n;
        int j;

        EVP_MD_CTX_init(&mctx);

        if (s->state == SSL3_ST_CW_CERT_VRFY_A)
                {
                d=(unsigned char *)s->init_buf->data;
                p= &(d[4]);
                pkey=s->cert->key->privatekey;
/* Create context from key and test if sha1 is allowed as digest */
                pctx = EVP_PKEY_CTX_new(pkey,NULL);
                EVP_PKEY_sign_init(pctx);
                if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
                        {
                        if (TLS1_get_version(s) < TLS1_2_VERSION)
                                s->method->ssl3_enc->cert_verify_mac(s,
                                                NID_sha1,
                                                &(data[MD5_DIGEST_LENGTH]));
                        }
                else
                        {
                        ERR_clear_error();
                        }
                /* For TLS v1.2 send signature algorithm and signature
                 * using agreed digest and cached handshake records.
                 */
                if (TLS1_get_version(s) >= TLS1_2_VERSION)
                        {
                        long hdatalen = 0;
                        void *hdata;
                        const EVP_MD *md = s->cert->key->digest;
                        hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
                                                                &hdata);
                        if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
                                                ERR_R_INTERNAL_ERROR);
                                goto err;
                                }
                        p += 2;
#ifdef SSL_DEBUG
                        fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
                                                        EVP_MD_name(md));
#endif
                        if (!EVP_SignInit_ex(&mctx, md, NULL)
                                || !EVP_SignUpdate(&mctx, hdata, hdatalen)
                                || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
                                                ERR_R_EVP_LIB);
                                goto err;
                                }
                        s2n(u,p);
                        n = u + 4;
                        if (!ssl3_digest_cached_records(s))
                                goto err;
                        }
                else
#ifndef OPENSSL_NO_RSA
                if (pkey->type == EVP_PKEY_RSA)
                        {
                        s->method->ssl3_enc->cert_verify_mac(s,
                                NID_md5,
                                &(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_SSL3_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_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
                                goto err;
                                }
                        s2n(j,p);
                        n=j+2;
                        }
                else
#endif
#ifndef OPENSSL_NO_ECDSA
                        if (pkey->type == EVP_PKEY_EC)
                        {
                        if (!ECDSA_sign(pkey->save_type,
                                &(data[MD5_DIGEST_LENGTH]),
                                SHA_DIGEST_LENGTH,&(p[2]),
                                (unsigned int *)&j,pkey->pkey.ec))
                                {
                                SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
                                    ERR_R_ECDSA_LIB);
                                goto err;
                                }
                        s2n(j,p);
                        n=j+2;
                        }
                else
#endif
                if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001) 
                {
                unsigned char signbuf[64];
                int i;
                size_t sigsize=64;
                s->method->ssl3_enc->cert_verify_mac(s,
                        NID_id_GostR3411_94,
                        data);
                if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
                        SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
                        ERR_R_INTERNAL_ERROR);
                        goto err;
                }
                for (i=63,j=0; i>=0; j++, i--) {
                        p[2+j]=signbuf[i];
                }       
                s2n(j,p);
                n=j+2;
                }
                else
                {
                        SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
                        goto err;
                }
                *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
                l2n3(n,d);

                s->state=SSL3_ST_CW_CERT_VRFY_B;
                s->init_num=(int)n+4;
                s->init_off=0;
                }
        EVP_MD_CTX_cleanup(&mctx);
        EVP_PKEY_CTX_free(pctx);
        return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
err:
        EVP_MD_CTX_cleanup(&mctx);
        EVP_PKEY_CTX_free(pctx);
        return(-1);
        }

/* Check a certificate can be used for client authentication. Currently
 * check cert exists, if we have a suitable digest for TLS 1.2  and if
 * static DH client certificates can be used.
 */
static int ssl3_check_client_certificate(SSL *s)
        {
        unsigned long alg_k;
        if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
                return 0;
        /* If no suitable signature algorithm can't use certificate */
        if (TLS1_get_version(s) >= TLS1_2_VERSION && !s->cert->key->digest)
                return 0;
        alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
        /* See if we can use client certificate for fixed DH */
        if (alg_k & (SSL_kDHr|SSL_kDHd))
                {
                SESS_CERT *scert = s->session->sess_cert;
                int i = scert->peer_cert_type;
                EVP_PKEY *clkey = NULL, *spkey = NULL;
                clkey = s->cert->key->privatekey;
                /* If client key not DH assume it can be used */
                if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
                        return 1;
                if (i >= 0)
                        spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
                if (spkey)
                        {
                        /* Compare server and client parameters */
                        i = EVP_PKEY_cmp_parameters(clkey, spkey);
                        EVP_PKEY_free(spkey);
                        if (i != 1)
                                return 0;
                        }
                s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
                }
        return 1;
        }

int ssl3_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)
                {
                /* Let cert callback update client certificates if required */
                if (s->cert->cert_cb
                        && s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
                        {
                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
                        return 0;
                        }
                if (ssl3_check_client_certificate(s))
                        s->state=SSL3_ST_CW_CERT_C;
                else
                        s->state=SSL3_ST_CW_CERT_B;
                }

        /* 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;
                i = ssl_do_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_SSL3_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 && !ssl3_check_client_certificate(s))
                        i = 0;
                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=ssl3_output_cert_chain(s,
                        (s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
                s->init_num=(int)l;
                s->init_off=0;
                }
        /* SSL3_ST_CW_CERT_D */
        return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
        }

#define has_bits(i,m)   (((i)&(m)) == (m))

int ssl3_check_cert_and_algorithm(SSL *s)
        {
        int i,idx;
        long alg_k,alg_a;
        EVP_PKEY *pkey=NULL;
        SESS_CERT *sc;
#ifndef OPENSSL_NO_RSA
        RSA *rsa;
#endif
#ifndef OPENSSL_NO_DH
        DH *dh;
#endif

        alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
        alg_a=s->s3->tmp.new_cipher->algorithm_auth;

        /* we don't have a certificate */
        if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
                return(1);

        sc=s->session->sess_cert;
        if (sc == NULL)
                {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
                goto err;
                }

#ifndef OPENSSL_NO_RSA
        rsa=s->session->sess_cert->peer_rsa_tmp;
#endif
#ifndef OPENSSL_NO_DH
        dh=s->session->sess_cert->peer_dh_tmp;
#endif

        /* This is the passed certificate */

        idx=sc->peer_cert_type;
#ifndef OPENSSL_NO_ECDH
        if (idx == SSL_PKEY_ECC)
                {
                if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
                                                                s) == 0) 
                        { /* check failed */
                        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
                        goto f_err;
                        }
                else 
                        {
                        return 1;
                        }
                }
#endif
        pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
        i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
        EVP_PKEY_free(pkey);

        
        /* Check that we have a certificate if we require one */
        if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
                {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
                goto f_err;
                }
#ifndef OPENSSL_NO_DSA
        else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
                {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
                goto f_err;
                }
#endif
#ifndef OPENSSL_NO_RSA
        if ((alg_k & SSL_kRSA) &&
                !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
                {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
                goto f_err;
                }
#endif
#ifndef OPENSSL_NO_DH
        if ((alg_k & SSL_kEDH) && 
                !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
                {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
                goto f_err;
                }
        else if ((alg_k & SSL_kDHr) && (TLS1_get_version(s) < TLS1_2_VERSION) &&
                !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
                {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
                goto f_err;
                }
#ifndef OPENSSL_NO_DSA
        else if ((alg_k & SSL_kDHd) && (TLS1_get_version(s) < TLS1_2_VERSION) &&
                !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
                {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
                goto f_err;
                }
#endif
#endif

        if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
                {
#ifndef OPENSSL_NO_RSA
                if (alg_k & SSL_kRSA)
                        {
                        if (rsa == NULL
                            || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
                                {
                                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
                                goto f_err;
                                }
                        }
                else
#endif
#ifndef OPENSSL_NO_DH
                        if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
                            {
                            if (dh == NULL
                                || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
                                {
                                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
                                goto f_err;
                                }
                        }
                else
#endif
                        {
                        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
                        goto f_err;
                        }
                }
        return(1);
f_err:
        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
err:
        return(0);
        }

/* Check to see if handshake is full or resumed. Usually this is just a
 * case of checking to see if a cache hit has occurred. In the case of
 * session tickets we have to check the next message to be sure.
 */

#ifndef OPENSSL_NO_TLSEXT
# ifndef OPENSSL_NO_NEXTPROTONEG
int ssl3_send_next_proto(SSL *s)
        {
        unsigned int len, padding_len;
        unsigned char *d;

        if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
                {
                len = s->next_proto_negotiated_len;
                padding_len = 32 - ((len + 2) % 32);
                d = (unsigned char *)s->init_buf->data;
                d[4] = len;
                memcpy(d + 5, s->next_proto_negotiated, len);
                d[5 + len] = padding_len;
                memset(d + 6 + len, 0, padding_len);
                *(d++)=SSL3_MT_NEXT_PROTO;
                l2n3(2 + len + padding_len, d);
                s->state = SSL3_ST_CW_NEXT_PROTO_B;
                s->init_num = 4 + 2 + len + padding_len;
                s->init_off = 0;
                }

        return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
        }
# endif

int ssl3_check_finished(SSL *s)
        {
        int ok;
        long n;
        /* If we have no ticket it cannot be a resumed session. */
        if (!s->session->tlsext_tick)
                return 1;
        /* this function is called when we really expect a Certificate
         * message, so permit appropriate message length */
        n=s->method->ssl_get_message(s,
                SSL3_ST_CR_CERT_A,
                SSL3_ST_CR_CERT_B,
                -1,
                s->max_cert_list,
                &ok);
        if (!ok) return((int)n);
        s->s3->tmp.reuse_message = 1;
        if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
                || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
                return 2;

        return 1;
        }
#endif

int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
        {
        int i = 0;
#ifndef OPENSSL_NO_ENGINE
        if (s->ctx->client_cert_engine)
                {
                i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
                                                SSL_get_client_CA_list(s),
                                                px509, ppkey, NULL, NULL, NULL);
                if (i != 0)
                        return i;
                }
#endif
        if (s->ctx->client_cert_cb)
                i = s->ctx->client_cert_cb(s,px509,ppkey);
        return i;
        }

#ifndef OPENSSL_NO_TLSEXT
int tls1_get_server_supplemental_data(SSL *s)
        {
        int al;
        int ok;
        unsigned long supp_data_len, authz_data_len;
        long n;
        unsigned short supp_data_type, authz_data_type, proof_len;
        const unsigned char *p;
        unsigned char *new_proof;

        n=s->method->ssl_get_message(s,
                SSL3_ST_CR_SUPPLEMENTAL_DATA_A,
                SSL3_ST_CR_SUPPLEMENTAL_DATA_B,
                SSL3_MT_SUPPLEMENTAL_DATA,
                /* use default limit */
                TLSEXT_MAXLEN_supplemental_data,
                &ok);

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

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

        /* The message cannot be empty */
        if (n < 3)
                {
                al = SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
                goto f_err;
                }
        /* Length of supplemental data */
        n2l3(p,supp_data_len);
        n -= 3;
        /* We must have at least one supplemental data entry
         * with type (1 byte) and length (2 bytes). */
        if (supp_data_len != (unsigned long) n || n < 4)
                {
                al = SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
                goto f_err;
                }
        /* Supplemental data type: must be authz_data */
        n2s(p,supp_data_type);
        n -= 2;
        if (supp_data_type != TLSEXT_SUPPLEMENTALDATATYPE_authz_data)
                {
                al = SSL_AD_UNEXPECTED_MESSAGE;
                SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_SUPPLEMENTAL_DATA_TYPE);
                goto f_err;
                }
        /* Authz data length */
        n2s(p, authz_data_len);
        n -= 2;
        if (authz_data_len != (unsigned long) n || n < 1)
                {
                al = SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
                goto f_err;
                }
        /* Authz data type: must be audit_proof */
        authz_data_type = *(p++);
        n -= 1;
        if (authz_data_type != TLSEXT_AUTHZDATAFORMAT_audit_proof)
                {
                al=SSL_AD_UNEXPECTED_MESSAGE;
                SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_AUTHZ_DATA_TYPE);
                goto f_err;
                }
        /* We have a proof: read its length */
        if (n < 2)
                {
                al = SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
                goto f_err;
                }
        n2s(p, proof_len);
        n -= 2;
        if (proof_len != (unsigned long) n)
                {
                al = SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
                goto f_err;
                }
        /* Store the proof */
        new_proof = OPENSSL_realloc(s->session->audit_proof,
                                    proof_len);
        if (new_proof == NULL)
                {
                SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,ERR_R_MALLOC_FAILURE);
                return 0;
                }
        s->session->audit_proof_length = proof_len;
        s->session->audit_proof = new_proof;
        memcpy(s->session->audit_proof, p, proof_len);

        /* Got the proof, but can't verify it yet. */
        return 1;
f_err:
        ssl3_send_alert(s,SSL3_AL_FATAL,al);
        return -1;
        }
#endif