text: /* ssl/s2_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) 1998-2001 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).
   *
   */
  
  #include "ssl_locl.h"
  #ifndef OPENSSL_NO_SSL2
  #include <stdio.h>
  #include <openssl/rand.h>
  #include <openssl/buffer.h>
  #include <openssl/objects.h>
  #include <openssl/evp.h>
  
  static SSL_METHOD *ssl2_get_client_method(int ver);
  static int get_server_finished(SSL *s);
  static int get_server_verify(SSL *s);
  static int get_server_hello(SSL *s);
  static int client_hello(SSL *s); 
  static int client_master_key(SSL *s);
  static int client_finished(SSL *s);
  static int client_certificate(SSL *s);
  static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
  	unsigned char *to,int padding);
  #define BREAK	break
  
  static SSL_METHOD *ssl2_get_client_method(int ver)
  	{
  	if (ver == SSL2_VERSION)
  		return(SSLv2_client_method());
  	else
  		return(NULL);
  	}
  
  IMPLEMENT_ssl2_meth_func(SSLv2_client_method,
  			ssl_undefined_function,
  			ssl2_connect,
  			ssl2_get_client_method)
  
  int ssl2_connect(SSL *s)
  	{
  	unsigned long l=(unsigned long)time(NULL);
  	BUF_MEM *buf=NULL;
  	int ret= -1;
  	void (*cb)(const SSL *ssl,int type,int val)=NULL;
  	int new_state,state;
  
  	RAND_add(&l,sizeof(l),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;
  
  	/* init things to blank */
  	s->in_handshake++;
  	if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
  
  	for (;;)
  		{
  		state=s->state;
  
  		switch (s->state)
  			{
  		case SSL_ST_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);
  
  			s->version=SSL2_VERSION;
  			s->type=SSL_ST_CONNECT;
  
  			buf=s->init_buf;
  			if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
  				{
  				ret= -1;
  				goto end;
  				}
  			if (!BUF_MEM_grow(buf,
  				SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
  				{
  				if (buf == s->init_buf)
  					buf=NULL;
  				ret= -1;
  				goto end;
  				}
  			s->init_buf=buf;
  			buf=NULL;
  			s->init_num=0;
  			s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
  			s->ctx->stats.sess_connect++;
  			s->handshake_func=ssl2_connect;
  			BREAK;
  
  		case SSL2_ST_SEND_CLIENT_HELLO_A:
  		case SSL2_ST_SEND_CLIENT_HELLO_B:
  			s->shutdown=0;
  			ret=client_hello(s);
  			if (ret <= 0) goto end;
  			s->init_num=0;
  			s->state=SSL2_ST_GET_SERVER_HELLO_A;
  			BREAK;
  		
  		case SSL2_ST_GET_SERVER_HELLO_A:
  		case SSL2_ST_GET_SERVER_HELLO_B:
  			ret=get_server_hello(s);
  			if (ret <= 0) goto end;
  			s->init_num=0;
  			if (!s->hit) /* new session */
  				{
  				s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
  				BREAK; 
  				}
  			else
  				{
  				s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
  				break;
  				}
  	
  		case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
  		case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
  			ret=client_master_key(s);
  			if (ret <= 0) goto end;
  			s->init_num=0;
  			s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
  			break;
  
  		case SSL2_ST_CLIENT_START_ENCRYPTION:
  			/* Ok, we now have all the stuff needed to
  			 * start encrypting, so lets fire it up :-) */
  			if (!ssl2_enc_init(s,1))
  				{
  				ret= -1;
  				goto end;
  				}
  			s->s2->clear_text=0;
  			s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
  			break;
  
  		case SSL2_ST_SEND_CLIENT_FINISHED_A:
  		case SSL2_ST_SEND_CLIENT_FINISHED_B:
  			ret=client_finished(s);
  			if (ret <= 0) goto end;
  			s->init_num=0;
  			s->state=SSL2_ST_GET_SERVER_VERIFY_A;
  			break;
  
  		case SSL2_ST_GET_SERVER_VERIFY_A:
  		case SSL2_ST_GET_SERVER_VERIFY_B:
  			ret=get_server_verify(s);
  			if (ret <= 0) goto end;
  			s->init_num=0;
  			s->state=SSL2_ST_GET_SERVER_FINISHED_A;
  			break;
  
  		case SSL2_ST_GET_SERVER_FINISHED_A:
  		case SSL2_ST_GET_SERVER_FINISHED_B:
  			ret=get_server_finished(s);
  			if (ret <= 0) goto end;
  			break;
  
  		case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
  		case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
  		case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
  		case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
  		case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
  			ret=client_certificate(s);
  			if (ret <= 0) goto end;
  			s->init_num=0;
  			s->state=SSL2_ST_GET_SERVER_FINISHED_A;
  			break;
  
  		case SSL_ST_OK:
  			if (s->init_buf != NULL)
  				{
  				BUF_MEM_free(s->init_buf);
  				s->init_buf=NULL;
  				}
  			s->init_num=0;
  		/*	ERR_clear_error();*/
  
  			/* If we want to cache session-ids in the client
  			 * and we successfully add the session-id to the
  			 * cache, and there is a callback, then pass it out.
  			 * 26/11/96 - eay - only add if not a re-used session.
  			 */
  
  			ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
  			if (s->hit) s->ctx->stats.sess_hit++;
  
  			ret=1;
  			/* s->server=0; */
  			s->ctx->stats.sess_connect_good++;
  
  			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
  
  			goto end;
  			/* break; */
  		default:
  			SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
  			return(-1);
  			/* break; */
  			}
  
  		if ((cb != NULL) && (s->state != state))
  			{
  			new_state=s->state;
  			s->state=state;
  			cb(s,SSL_CB_CONNECT_LOOP,1);
  			s->state=new_state;
  			}
  		}
  end:
  	s->in_handshake--;
  	if (buf != NULL)
  		BUF_MEM_free(buf);
  	if (cb != NULL) 
  		cb(s,SSL_CB_CONNECT_EXIT,ret);
  	return(ret);
  	}
  
  static int get_server_hello(SSL *s)
  	{
  	unsigned char *buf;
  	unsigned char *p;
  	int i,j;
  	unsigned long len;
  	STACK_OF(SSL_CIPHER) *sk=NULL,*cl, *prio, *allow;
  
  	buf=(unsigned char *)s->init_buf->data;
  	p=buf;
  	if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
  		{
  		i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
  		if (i < (11-s->init_num)) 
  			return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
  		s->init_num = 11;
  
  		if (*(p++) != SSL2_MT_SERVER_HELLO)
  			{
  			if (p[-1] != SSL2_MT_ERROR)
  				{
  				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
  				SSLerr(SSL_F_GET_SERVER_HELLO,
  					SSL_R_READ_WRONG_PACKET_TYPE);
  				}
  			else
  				SSLerr(SSL_F_GET_SERVER_HELLO,
  					SSL_R_PEER_ERROR);
  			return(-1);
  			}
  #ifdef __APPLE_CC__
  		/* The Rhapsody 5.5 (a.k.a. MacOS X) compiler bug
  		 * workaround. <appro@fy.chalmers.se> */
  		s->hit=(i=*(p++))?1:0;
  #else
  		s->hit=(*(p++))?1:0;
  #endif
  		s->s2->tmp.cert_type= *(p++);
  		n2s(p,i);
  		if (i < s->version) s->version=i;
  		n2s(p,i); s->s2->tmp.cert_length=i;
  		n2s(p,i); s->s2->tmp.csl=i;
  		n2s(p,i); s->s2->tmp.conn_id_length=i;
  		s->state=SSL2_ST_GET_SERVER_HELLO_B;
  		}
  
  	/* SSL2_ST_GET_SERVER_HELLO_B */
  	len = 11 + (unsigned long)s->s2->tmp.cert_length + (unsigned long)s->s2->tmp.csl + (unsigned long)s->s2->tmp.conn_id_length;
  	if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
  		{
  		SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_MESSAGE_TOO_LONG);
  		return -1;
  		}
  	j = (int)len - s->init_num;
  	i = ssl2_read(s,(char *)&(buf[s->init_num]),j);
  	if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
  	if (s->msg_callback)
  		s->msg_callback(0, s->version, 0, buf, (size_t)len, s, s->msg_callback_arg); /* SERVER-HELLO */
  
  	/* things are looking good */
  
  	p = buf + 11;
  	if (s->hit)
  		{
  		if (s->s2->tmp.cert_length != 0) 
  			{
  			SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
  			return(-1);
  			}
  		if (s->s2->tmp.cert_type != 0)
  			{
  			if (!(s->options &
  				SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
  				{
  				SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
  				return(-1);
  				}
  			}
  		if (s->s2->tmp.csl != 0)
  			{
  			SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
  			return(-1);
  			}
  		}
  	else
  		{
  #ifdef undef
  		/* very bad */
  		memset(s->session->session_id,0,
  			SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
  		s->session->session_id_length=0;
  		*/
  #endif
  
  		/* we need to do this in case we were trying to reuse a 
  		 * client session but others are already reusing it.
  		 * If this was a new 'blank' session ID, the session-id
  		 * length will still be 0 */
  		if (s->session->session_id_length > 0)
  			{
  			if (!ssl_get_new_session(s,0))
  				{
  				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
  				return(-1);
  				}
  			}
  
  		if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
  			s->s2->tmp.cert_length,p) <= 0)
  			{
  			ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
  			return(-1);
  			}
  		p+=s->s2->tmp.cert_length;
  
  		if (s->s2->tmp.csl == 0)
  			{
  			ssl2_return_error(s,SSL2_PE_NO_CIPHER);
  			SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
  			return(-1);
  			}
  
  		/* We have just received a list of ciphers back from the
  		 * server.  We need to get the ones that match, then select
  		 * the one we want the most :-). */
  
  		/* load the ciphers */
  		sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
  					    &s->session->ciphers);
  		p+=s->s2->tmp.csl;
  		if (sk == NULL)
  			{
  			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
  			SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
  			return(-1);
  			}
  
  		(void)sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
  
  		/* get the array of ciphers we will accept */
  		cl=SSL_get_ciphers(s);
  		(void)sk_SSL_CIPHER_set_cmp_func(cl,ssl_cipher_ptr_id_cmp);
  
  		/*
  		 * If server preference flag set, choose the first
  		 * (highest priority) cipher the server sends, otherwise
  		 * client preference has priority.
  		 */
  		if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
  		    {
  		    prio = sk;
  		    allow = cl;
  		    }
  		else
  		    {
  		    prio = cl;
  		    allow = sk;
  		    }
  		/* In theory we could have ciphers sent back that we
  		 * don't want to use but that does not matter since we
  		 * will check against the list we originally sent and
  		 * for performance reasons we should not bother to match
  		 * the two lists up just to check. */
  		for (i=0; i<sk_SSL_CIPHER_num(prio); i++)
  			{
  			if (sk_SSL_CIPHER_find(allow,
  					     sk_SSL_CIPHER_value(prio,i)) >= 0)
  				break;
  			}
  
  		if (i >= sk_SSL_CIPHER_num(prio))
  			{
  			ssl2_return_error(s,SSL2_PE_NO_CIPHER);
  			SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
  			return(-1);
  			}
  		s->session->cipher=sk_SSL_CIPHER_value(prio,i);
  
  
  		if (s->session->peer != NULL) /* can't happen*/
  			{
  			ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
  			SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
  			return(-1);
  			}
  
  		s->session->peer = s->session->sess_cert->peer_key->x509;
  		/* peer_key->x509 has been set by ssl2_set_certificate. */
  		CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509);
  		}
  
  	if (s->session->sess_cert == NULL 
        || s->session->peer != s->session->sess_cert->peer_key->x509)
  		/* can't happen */
  		{
  		ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
  		SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
  		return(-1);
  		}
  		
  	s->s2->conn_id_length=s->s2->tmp.conn_id_length;
  	if (s->s2->conn_id_length > sizeof s->s2->conn_id)
  		{
  		ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
  		SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_SSL2_CONNECTION_ID_TOO_LONG);
  		return -1;
  		}
  	memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
  	return(1);
  	}
  
  static int client_hello(SSL *s)
  	{
  	unsigned char *buf;
  	unsigned char *p,*d;
  /*	CIPHER **cipher;*/
  	int i,n,j;
  
  	buf=(unsigned char *)s->init_buf->data;
  	if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
  		{
  		if ((s->session == NULL) ||
  			(s->session->ssl_version != s->version))
  			{
  			if (!ssl_get_new_session(s,0))
  				{
  				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
  				return(-1);
  				}
  			}
  		/* else use the pre-loaded session */
  
  		p=buf;					/* header */
  		d=p+9;					/* data section */
  		*(p++)=SSL2_MT_CLIENT_HELLO;		/* type */
  		s2n(SSL2_VERSION,p);			/* version */
  		n=j=0;
  
  		n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d,0);
  		d+=n;
  
  		if (n == 0)
  			{
  			SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
  			return(-1);
  			}
  
  		s2n(n,p);			/* cipher spec num bytes */
  
  		if ((s->session->session_id_length > 0) &&
  			(s->session->session_id_length <=
  			SSL2_MAX_SSL_SESSION_ID_LENGTH))
  			{
  			i=s->session->session_id_length;
  			s2n(i,p);		/* session id length */
  			memcpy(d,s->session->session_id,(unsigned int)i);
  			d+=i;
  			}
  		else
  			{
  			s2n(0,p);
  			}
  
  		s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
  		s2n(SSL2_CHALLENGE_LENGTH,p);		/* challenge length */
  		/*challenge id data*/
  		if (RAND_pseudo_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH) <= 0)
  			return -1;
  		memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
  		d+=SSL2_CHALLENGE_LENGTH;
  
  		s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
  		s->init_num=d-buf;
  		s->init_off=0;
  		}
  	/* SSL2_ST_SEND_CLIENT_HELLO_B */
  	return(ssl2_do_write(s));
  	}
  
  static int client_master_key(SSL *s)
  	{
  	unsigned char *buf;
  	unsigned char *p,*d;
  	int clear,enc,karg,i;
  	SSL_SESSION *sess;
  	const EVP_CIPHER *c;
  	const EVP_MD *md;
  
  	buf=(unsigned char *)s->init_buf->data;
  	if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
  		{
  
  		if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
  			{
  			ssl2_return_error(s,SSL2_PE_NO_CIPHER);
  			SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
  			return(-1);
  			}
  		sess=s->session;
  		p=buf;
  		d=p+10;
  		*(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
  
  		i=ssl_put_cipher_by_char(s,sess->cipher,p);
  		p+=i;
  
  		/* make key_arg data */
  		i=EVP_CIPHER_iv_length(c);
  		sess->key_arg_length=i;
  		if (i > SSL_MAX_KEY_ARG_LENGTH)
  			{
  			ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
  			SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
  			return -1;
  			}
  		if (i > 0)
  			if (RAND_pseudo_bytes(sess->key_arg,i) <= 0)
  				return -1;
  
  		/* make a master key */
  		i=EVP_CIPHER_key_length(c);
  		sess->master_key_length=i;
  		if (i > 0)
  			{
  			if (i > (int)sizeof(sess->master_key))
  				{
  				ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
  				SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
  				return -1;
  				}
  			if (RAND_bytes(sess->master_key,i) <= 0)
  				{
  				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
  				return(-1);
  				}
  			}
  
  		if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
  			enc=8;
  		else if (SSL_C_IS_EXPORT(sess->cipher))
  			enc=5;
  		else
  			enc=i;
  
  		if ((int)i < enc)
  			{
  			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
  			SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
  			return(-1);
  			}
  		clear=i-enc;
  		s2n(clear,p);
  		memcpy(d,sess->master_key,(unsigned int)clear);
  		d+=clear;
  
  		enc=ssl_rsa_public_encrypt(sess->sess_cert,enc,
  			&(sess->master_key[clear]),d,
  			(s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
  		if (enc <= 0)
  			{
  			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
  			SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
  			return(-1);
  			}
  #ifdef PKCS1_CHECK
  		if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
  		if (s->options & SSL_OP_PKCS1_CHECK_2)
  			sess->master_key[clear]++;
  #endif
  		s2n(enc,p);
  		d+=enc;
  		karg=sess->key_arg_length;	
  		s2n(karg,p); /* key arg size */
  		if (karg > (int)sizeof(sess->key_arg))
  			{
  			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
  			SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
  			return -1;
  			}
  		memcpy(d,sess->key_arg,(unsigned int)karg);
  		d+=karg;
  
  		s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
  		s->init_num=d-buf;
  		s->init_off=0;
  		}
  
  	/* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
  	return(ssl2_do_write(s));
  	}
  
  static int client_finished(SSL *s)
  	{
  	unsigned char *p;
  
  	if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
  		{
  		p=(unsigned char *)s->init_buf->data;
  		*(p++)=SSL2_MT_CLIENT_FINISHED;
  		if (s->s2->conn_id_length > sizeof s->s2->conn_id)
  			{
  			SSLerr(SSL_F_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
  			return -1;
  			}
  		memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
  
  		s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
  		s->init_num=s->s2->conn_id_length+1;
  		s->init_off=0;
  		}
  	return(ssl2_do_write(s));
  	}
  
  /* read the data and then respond */
  static int client_certificate(SSL *s)
  	{
  	unsigned char *buf;
  	unsigned char *p,*d;
  	int i;
  	unsigned int n;
  	int cert_ch_len;
  	unsigned char *cert_ch;
  
  	buf=(unsigned char *)s->init_buf->data;
  
  	/* We have a cert associated with the SSL, so attach it to
  	 * the session if it does not have one */
  
  	if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
  		{
  		i=ssl2_read(s,(char *)&(buf[s->init_num]),
  			SSL2_MAX_CERT_CHALLENGE_LENGTH+2-s->init_num);
  		if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+2-s->init_num))
  			return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
  		s->init_num += i;
  		if (s->msg_callback)
  			s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* REQUEST-CERTIFICATE */
  
  		/* type=buf[0]; */
  		/* type eq x509 */
  		if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
  			{
  			ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
  			SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
  			return(-1);
  			}
  
  		if ((s->cert == NULL) ||
  			(s->cert->key->x509 == NULL) ||
  			(s->cert->key->privatekey == NULL))
  			{
  			s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
  			}
  		else
  			s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
  		}
  
  	cert_ch = buf + 2;
  	cert_ch_len = s->init_num - 2;
  
  	if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
  		{
  		X509 *x509=NULL;
  		EVP_PKEY *pkey=NULL;
  
  		/* If we get an error we need to
  		 * ssl->rwstate=SSL_X509_LOOKUP;
  		 * return(error);
  		 * We should then be retried when things are ok and we
  		 * can get a cert or not */
  
  		i=0;
  		if (s->ctx->client_cert_cb != NULL)
  			{
  			i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
  			}
  
  		if (i < 0)
  			{
  			s->rwstate=SSL_X509_LOOKUP;
  			return(-1);
  			}
  		s->rwstate=SSL_NOTHING;
  
  		if ((i == 1) && (pkey != NULL) && (x509 != NULL))
  			{
  			s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
  			if (	!SSL_use_certificate(s,x509) || 
  				!SSL_use_PrivateKey(s,pkey))
  				{
  				i=0;
  				}
  			X509_free(x509);
  			EVP_PKEY_free(pkey);
  			}
  		else if (i == 1)
  			{
  			if (x509 != NULL) X509_free(x509);
  			if (pkey != NULL) EVP_PKEY_free(pkey);
  			SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
  			i=0;
  			}
  
  		if (i == 0)
  			{
  			/* We have no client certificate to respond with
  			 * so send the correct error message back */
  			s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
  			p=buf;
  			*(p++)=SSL2_MT_ERROR;
  			s2n(SSL2_PE_NO_CERTIFICATE,p);
  			s->init_off=0;
  			s->init_num=3;
  			/* Write is done at the end */
  			}
  		}
  
  	if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
  		{
  		return(ssl2_do_write(s));
  		}
  
  	if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
  		{
  		EVP_MD_CTX ctx;
  
  		/* ok, now we calculate the checksum
  		 * do it first so we can reuse buf :-) */
  		p=buf;
  		EVP_MD_CTX_init(&ctx);
  		EVP_SignInit_ex(&ctx,s->ctx->rsa_md5, NULL);
  		EVP_SignUpdate(&ctx,s->s2->key_material,
  			       s->s2->key_material_length);
  		EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
  		n=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
  		EVP_SignUpdate(&ctx,buf,(unsigned int)n);
  
  		p=buf;
  		d=p+6;
  		*(p++)=SSL2_MT_CLIENT_CERTIFICATE;
  		*(p++)=SSL2_CT_X509_CERTIFICATE;
  		n=i2d_X509(s->cert->key->x509,&d);
  		s2n(n,p);
  
  		if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
  			{
  			/* this is not good.  If things have failed it
  			 * means there so something wrong with the key.
  			 * We will continue with a 0 length signature
  			 */
  			}
  		EVP_MD_CTX_cleanup(&ctx);
  		s2n(n,p);
  		d+=n;
  
  		s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
  		s->init_num=d-buf;
  		s->init_off=0;
  		}
  	/* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
  	return(ssl2_do_write(s));
  	}
  
  static int get_server_verify(SSL *s)
  	{
  	unsigned char *p;
  	int i, n, len;
  
  	p=(unsigned char *)s->init_buf->data;
  	if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
  		{
  		i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
  		if (i < (1-s->init_num)) 
  			return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
  		s->init_num += i;
  
  		s->state= SSL2_ST_GET_SERVER_VERIFY_B;
  		if (*p != SSL2_MT_SERVER_VERIFY)
  			{
  			if (p[0] != SSL2_MT_ERROR)
  				{
  				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
  				SSLerr(SSL_F_GET_SERVER_VERIFY,
  					SSL_R_READ_WRONG_PACKET_TYPE);
  				}
  			else
  				{
  				SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_PEER_ERROR);
  				/* try to read the error message */
  				i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
  				return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
  				}
  			return(-1);
  			}
  		}
  	
  	p=(unsigned char *)s->init_buf->data;
  	len = 1 + s->s2->challenge_length;
  	n =  len - s->init_num;
  	i = ssl2_read(s,(char *)&(p[s->init_num]),n);
  	if (i < n)
  		return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
  	if (s->msg_callback)
  		s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* SERVER-VERIFY */
  	p += 1;
  
  	if (memcmp(p,s->s2->challenge,s->s2->challenge_length) != 0)
  		{
  		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
  		SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
  		return(-1);
  		}
  	return(1);
  	}
  
  static int get_server_finished(SSL *s)
  	{
  	unsigned char *buf;
  	unsigned char *p;
  	int i, n, len;
  
  	buf=(unsigned char *)s->init_buf->data;
  	p=buf;
  	if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
  		{
  		i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
  		if (i < (1-s->init_num))
  			return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
  		s->init_num += i;
  
  		if (*p == SSL2_MT_REQUEST_CERTIFICATE)
  			{
  			s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
  			return(1);
  			}
  		else if (*p != SSL2_MT_SERVER_FINISHED)
  			{
  			if (p[0] != SSL2_MT_ERROR)
  				{
  				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
  				SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
  				}
  			else
  				{
  				SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
  				/* try to read the error message */
  				i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
  				return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
  				}
  			return(-1);
  			}
  		s->state=SSL2_ST_GET_SERVER_FINISHED_B;
  		}
  
  	len = 1 + SSL2_SSL_SESSION_ID_LENGTH;
  	n = len - s->init_num;
  	i = ssl2_read(s,(char *)&(buf[s->init_num]), n);
  	if (i < n) /* XXX could be shorter than SSL2_SSL_SESSION_ID_LENGTH, that's the maximum */
  		return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
  	s->init_num += i;
  	if (s->msg_callback)
  		s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* SERVER-FINISHED */
  
  	if (!s->hit) /* new session */
  		{
  		/* new session-id */
  		/* Make sure we were not trying to re-use an old SSL_SESSION
  		 * or bad things can happen */
  		/* ZZZZZZZZZZZZZ */
  		s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
  		memcpy(s->session->session_id,p+1,SSL2_SSL_SESSION_ID_LENGTH);
  		}
  	else
  		{
  		if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
  			{
  			if ((s->session->session_id_length > sizeof s->session->session_id)
  			    || (0 != memcmp(buf + 1, s->session->session_id,
  			                    (unsigned int)s->session->session_id_length)))
  				{
  				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
  				SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
  				return(-1);
  				}
  			}
  		}
  	s->state = SSL_ST_OK;
  	return(1);
  	}
  
  /* loads in the certificate from the server */
  int ssl2_set_certificate(SSL *s, int type, int len, const unsigned char *data)
  	{
  	STACK_OF(X509) *sk=NULL;
  	EVP_PKEY *pkey=NULL;
  	SESS_CERT *sc=NULL;
  	int i;
  	X509 *x509=NULL;
  	int ret=0;
  	
  	x509=d2i_X509(NULL,&data,(long)len);
  	if (x509 == NULL)
  		{
  		SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
  		goto err;
  		}
  
  	if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
  		{
  		SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
  		goto err;
  		}
  
  	i=ssl_verify_cert_chain(s,sk);
  		
  	if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0))
  		{
  		SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
  		goto err;
  		}
  	ERR_clear_error(); /* but we keep s->verify_result */
  	s->session->verify_result = s->verify_result;
  
  	/* server's cert for this session */
  	sc=ssl_sess_cert_new();
  	if (sc == NULL)
  		{
  		ret= -1;
  		goto err;
  		}
  	if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
  	s->session->sess_cert=sc;
  
  	sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509;
  	sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]);
  
  	pkey=X509_get_pubkey(x509);
  	x509=NULL;
  	if (pkey == NULL)
  		{
  		SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
  		goto err;
  		}
  	if (pkey->type != EVP_PKEY_RSA)
  		{
  		SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
  		goto err;
  		}
  
  	if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE))
  		goto err;
  	ret=1;
  err:
  	sk_X509_free(sk);
  	X509_free(x509);
  	EVP_PKEY_free(pkey);
  	return(ret);
  	}
  
  static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
  	     unsigned char *to, int padding)
  	{
  	EVP_PKEY *pkey=NULL;
  	int i= -1;
  
  	if ((sc == NULL) || (sc->peer_key->x509 == NULL) ||
  		((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL))
  		{
  		SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
  		return(-1);
  		}
  	if (pkey->type != EVP_PKEY_RSA)
  		{
  		SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
  		goto end;
  		}
  
  	/* we have the public key */
  	i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
  	if (i < 0)
  		SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
  end:
  	EVP_PKEY_free(pkey);
  	return(i);
  	}
  #else /* !OPENSSL_NO_SSL2 */
  
  # if PEDANTIC
  static void *dummy=&dummy;
  # endif
  
  #endif
  