/* ssl/s3_enc.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) 1998-2002 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).

  *

  */

 /*

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

  */

 #include <stdio.h>

 #include "ssl_locl.h"

 #include <openssl/evp.h>

 #include <openssl/md5.h>

 #ifndef EMULATOR

 	static unsigned char ssl3_pad_1[48]={

 #else

 	static const unsigned char ssl3_pad_1[48]={

 #endif

 	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,

 	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,

 	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,

 	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,

 	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,

 	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };

 #ifndef EMULATOR

 	static unsigned char ssl3_pad_2[48]={

 #else

 	static const unsigned char ssl3_pad_2[48]={

 #endif

 	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,

 	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,

 	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,

 	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,

 	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,

 	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };

 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,

 	const char *sender, int len, unsigned char *p);

 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)

 	{

 	EVP_MD_CTX m5;

 	EVP_MD_CTX s1;

 	unsigned char buf[16],smd[SHA_DIGEST_LENGTH];

 	unsigned char c='A';

 	unsigned int i,j,k;

 #ifdef CHARSET_EBCDIC

 	c = os_toascii[c]; /*'A' in ASCII */

 #endif

 	k=0;

 	EVP_MD_CTX_init(&m5);

 	EVP_MD_CTX_init(&s1);

 	for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH)

 		{

 		k++;

 		if (k > sizeof buf)

 			{

 			/* bug: 'buf' is too small for this ciphersuite */

 			SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);

 			return 0;

 			}

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

 			buf[j]=c;

 		c++;

 		EVP_DigestInit_ex(&s1,EVP_sha1(), NULL);

 		EVP_DigestUpdate(&s1,buf,k);

 		EVP_DigestUpdate(&s1,s->session->master_key,

 			s->session->master_key_length);

 		EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);

 		EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);

 		EVP_DigestFinal_ex(&s1,smd,NULL);

 		EVP_DigestInit_ex(&m5,EVP_md5(), NULL);

 		EVP_DigestUpdate(&m5,s->session->master_key,

 			s->session->master_key_length);

 		EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);

 		if ((int)(i+MD5_DIGEST_LENGTH) > num)

 			{

 			EVP_DigestFinal_ex(&m5,smd,NULL);

 			memcpy(km,smd,(num-i));

 			}

 		else

 			EVP_DigestFinal_ex(&m5,km,NULL);

 		km+=MD5_DIGEST_LENGTH;

 		}

 	OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH);

 	EVP_MD_CTX_cleanup(&m5);

 	EVP_MD_CTX_cleanup(&s1);

 	return 1;

 	}

 int ssl3_change_cipher_state(SSL *s, int which)

 	{

 	unsigned char *p,*key_block,*mac_secret;

 	unsigned char exp_key[EVP_MAX_KEY_LENGTH];

 	unsigned char exp_iv[EVP_MAX_IV_LENGTH];

 	unsigned char *ms,*key,*iv,*er1,*er2;

 	EVP_CIPHER_CTX *dd;

 	const EVP_CIPHER *c;

 #ifndef OPENSSL_NO_COMP

 	COMP_METHOD *comp;

 #endif

 	const EVP_MD *m;

 	EVP_MD_CTX md;

 	int is_exp,n,i,j,k,cl;

 	int reuse_dd = 0;

 	is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);

 	c=s->s3->tmp.new_sym_enc;

 	m=s->s3->tmp.new_hash;

 #ifndef OPENSSL_NO_COMP

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

 		comp=NULL;

 	else

 		comp=s->s3->tmp.new_compression->method;

 #endif

 	key_block=s->s3->tmp.key_block;

 	if (which & SSL3_CC_READ)

 		{

 		if (s->enc_read_ctx != NULL)

 			reuse_dd = 1;

 		else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)

 			goto err;

 		else

 			/* make sure it's intialized in case we exit later with an error */

 			EVP_CIPHER_CTX_init(s->enc_read_ctx);

 		dd= s->enc_read_ctx;

 		s->read_hash=m;

 #ifndef OPENSSL_NO_COMP

 		/* COMPRESS */

 		if (s->expand != NULL)

 			{

 			COMP_CTX_free(s->expand);

 			s->expand=NULL;

 			}

 		if (comp != NULL)

 			{

 			s->expand=COMP_CTX_new(comp);

 			if (s->expand == NULL)

 				{

 				SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);

 				goto err2;

 				}

 			if (s->s3->rrec.comp == NULL)

 				s->s3->rrec.comp=(unsigned char *)

 					OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);

 			if (s->s3->rrec.comp == NULL)

 				goto err;

 			}

 #endif

 		memset(&(s->s3->read_sequence[0]),0,8);

 		mac_secret= &(s->s3->read_mac_secret[0]);

 		}

 	else

 		{

 		if (s->enc_write_ctx != NULL)

 			reuse_dd = 1;

 		else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)

 			goto err;

 		else

 			/* make sure it's intialized in case we exit later with an error */

 			EVP_CIPHER_CTX_init(s->enc_write_ctx);

 		dd= s->enc_write_ctx;

 		s->write_hash=m;

 #ifndef OPENSSL_NO_COMP

 		/* COMPRESS */

 		if (s->compress != NULL)

 			{

 			COMP_CTX_free(s->compress);

 			s->compress=NULL;

 			}

 		if (comp != NULL)

 			{

 			s->compress=COMP_CTX_new(comp);

 			if (s->compress == NULL)

 				{

 				SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);

 				goto err2;

 				}

 			}

 #endif

 		memset(&(s->s3->write_sequence[0]),0,8);

 		mac_secret= &(s->s3->write_mac_secret[0]);

 		}

 	if (reuse_dd)

 		EVP_CIPHER_CTX_cleanup(dd);

 	p=s->s3->tmp.key_block;

 	i=EVP_MD_size(m);

 	cl=EVP_CIPHER_key_length(c);

 	j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?

 		 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;

 	/* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */

 	k=EVP_CIPHER_iv_length(c);

 	if (	(which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||

 		(which == SSL3_CHANGE_CIPHER_SERVER_READ))

 		{

 		ms=  &(p[ 0]); n=i+i;

 		key= &(p[ n]); n+=j+j;

 		iv=  &(p[ n]); n+=k+k;

 		er1= &(s->s3->client_random[0]);

 		er2= &(s->s3->server_random[0]);

 		}

 	else

 		{

 		n=i;

 		ms=  &(p[ n]); n+=i+j;

 		key= &(p[ n]); n+=j+k;

 		iv=  &(p[ n]); n+=k;

 		er1= &(s->s3->server_random[0]);

 		er2= &(s->s3->client_random[0]);

 		}

 	if (n > s->s3->tmp.key_block_length)

 		{

 		SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);

 		goto err2;

 		}

 	EVP_MD_CTX_init(&md);

 	memcpy(mac_secret,ms,i);

 	if (is_exp)

 		{

 		/* In here I set both the read and write key/iv to the

 		 * same value since only the correct one will be used :-).

 		 */

 		EVP_DigestInit_ex(&md,EVP_md5(), NULL);

 		EVP_DigestUpdate(&md,key,j);

 		EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);

 		EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);

 		EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);

 		key= &(exp_key[0]);

 		if (k > 0)

 			{

 			EVP_DigestInit_ex(&md,EVP_md5(), NULL);

 			EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);

 			EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);

 			EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);

 			iv= &(exp_iv[0]);

 			}

 		}

 	s->session->key_arg_length=0;

 	EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));

 	OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));

 	OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));

 	EVP_MD_CTX_cleanup(&md);

 	return(1);

 err:

 	SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);

 err2:

 	return(0);

 	}

 int ssl3_setup_key_block(SSL *s)

 	{

 	unsigned char *p;

 	const EVP_CIPHER *c;

 	const EVP_MD *hash;

 	int num;

 	int ret = 0;

 	SSL_COMP *comp;

 	if (s->s3->tmp.key_block_length != 0)

 		return(1);

 	if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))

 		{

 		SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);

 		return(0);

 		}

 	s->s3->tmp.new_sym_enc=c;

 	s->s3->tmp.new_hash=hash;

 #ifdef OPENSSL_NO_COMP

 	s->s3->tmp.new_compression=NULL;

 #else

 	s->s3->tmp.new_compression=comp;

 #endif

 	num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);

 	num*=2;

 	ssl3_cleanup_key_block(s);

 	if ((p=OPENSSL_malloc(num)) == NULL)

 		goto err;

 	s->s3->tmp.key_block_length=num;

 	s->s3->tmp.key_block=p;

 	ret = ssl3_generate_key_block(s,p,num);

 	if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))

 		{

 		/* enable vulnerability countermeasure for CBC ciphers with

 		 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)

 		 */

 		s->s3->need_empty_fragments = 1;

 		if (s->session->cipher != NULL)

 			{

 			if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)

 				s->s3->need_empty_fragments = 0;

 #ifndef OPENSSL_NO_RC4

 			if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)

 				s->s3->need_empty_fragments = 0;

 #endif

 			}

 		}

 	return ret;

 err:

 	SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);

 	return(0);

 	}

 void ssl3_cleanup_key_block(SSL *s)

 	{

 	if (s->s3->tmp.key_block != NULL)

 		{

 		OPENSSL_cleanse(s->s3->tmp.key_block,

 			s->s3->tmp.key_block_length);

 		OPENSSL_free(s->s3->tmp.key_block);

 		s->s3->tmp.key_block=NULL;

 		}

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

 	}

 int ssl3_enc(SSL *s, int send)

 	{

 	SSL3_RECORD *rec;

 	EVP_CIPHER_CTX *ds;

 	unsigned long l;

 	int bs,i;

 	const EVP_CIPHER *enc;

 	if (send)

 		{

 		ds=s->enc_write_ctx;

 		rec= &(s->s3->wrec);

 		if (s->enc_write_ctx == NULL)

 			enc=NULL;

 		else

 			enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);

 		}

 	else

 		{

 		ds=s->enc_read_ctx;

 		rec= &(s->s3->rrec);

 		if (s->enc_read_ctx == NULL)

 			enc=NULL;

 		else

 			enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);

 		}

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

 		(enc == NULL))

 		{

 		memmove(rec->data,rec->input,rec->length);

 		rec->input=rec->data;

 		}

 	else

 		{

 		l=rec->length;

 		bs=EVP_CIPHER_block_size(ds->cipher);

 		/* COMPRESS */

 		if ((bs != 1) && send)

 			{

 			i=bs-((int)l%bs);

 			/* we need to add 'i-1' padding bytes */

 			l+=i;

 			rec->length+=i;

 			rec->input[l-1]=(i-1);

 			}

 		if (!send)

 			{

 			if (l == 0 || l%bs != 0)

 				{

 				SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);

 				ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);

 				return 0;

 				}

 			/* otherwise, rec->length >= bs */

 			}

 		EVP_Cipher(ds,rec->data,rec->input,l);

 		if ((bs != 1) && !send)

 			{

 			i=rec->data[l-1]+1;

 			/* SSL 3.0 bounds the number of padding bytes by the block size;

 			 * padding bytes (except the last one) are arbitrary */

 			if (i > bs)

 				{

 				/* Incorrect padding. SSLerr() and ssl3_alert are done

 				 * by caller: we don't want to reveal whether this is

 				 * a decryption error or a MAC verification failure

 				 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */

 				return -1;

 				}

 			/* now i <= bs <= rec->length */

 			rec->length-=i;

 			}

 		}

 	return(1);

 	}

 void ssl3_init_finished_mac(SSL *s)

 	{

 	EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL);

 	EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL);

 	}

 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)

 	{

 	EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);

 	EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);

 	}

 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)

 	{

 	return(ssl3_handshake_mac(s,ctx,NULL,0,p));

 	}

 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,

 	     const char *sender, int len, unsigned char *p)

 	{

 	int ret;

 	ret=ssl3_handshake_mac(s,ctx1,sender,len,p);

 	p+=ret;

 	ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);

 	return(ret);

 	}

 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,

 	     const char *sender, int len, unsigned char *p)

 	{

 	unsigned int ret;

 	int npad,n;

 	unsigned int i;

 	unsigned char md_buf[EVP_MAX_MD_SIZE];

 	EVP_MD_CTX ctx;

 	EVP_MD_CTX_init(&ctx);

 	EVP_MD_CTX_copy_ex(&ctx,in_ctx);

 	n=EVP_MD_CTX_size(&ctx);

 	npad=(48/n)*n;

 	if (sender != NULL)

 		EVP_DigestUpdate(&ctx,sender,len);

 	EVP_DigestUpdate(&ctx,s->session->master_key,

 		s->session->master_key_length);

 	EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);

 	EVP_DigestFinal_ex(&ctx,md_buf,&i);

 	EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);

 	EVP_DigestUpdate(&ctx,s->session->master_key,

 		s->session->master_key_length);

 	EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);

 	EVP_DigestUpdate(&ctx,md_buf,i);

 	EVP_DigestFinal_ex(&ctx,p,&ret);

 	EVP_MD_CTX_cleanup(&ctx);

 	return((int)ret);

 	}

 int ssl3_mac(SSL *ssl, unsigned char *md, int send)

 	{

 	SSL3_RECORD *rec;

 	unsigned char *mac_sec,*seq;

 	EVP_MD_CTX md_ctx;

 	const EVP_MD *hash;

 	unsigned char *p,rec_char;

 	unsigned int md_size;

 	int npad;

 	if (send)

 		{

 		rec= &(ssl->s3->wrec);

 		mac_sec= &(ssl->s3->write_mac_secret[0]);

 		seq= &(ssl->s3->write_sequence[0]);

 		hash=ssl->write_hash;

 		}

 	else

 		{

 		rec= &(ssl->s3->rrec);

 		mac_sec= &(ssl->s3->read_mac_secret[0]);

 		seq= &(ssl->s3->read_sequence[0]);

 		hash=ssl->read_hash;

 		}

 	md_size=EVP_MD_size(hash);

 	npad=(48/md_size)*md_size;

 	/* Chop the digest off the end :-) */

 	EVP_MD_CTX_init(&md_ctx);

 	EVP_DigestInit_ex(  &md_ctx,hash, NULL);

 	EVP_DigestUpdate(&md_ctx,mac_sec,md_size);

 	EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);

 	EVP_DigestUpdate(&md_ctx,seq,8);

 	rec_char=rec->type;

 	EVP_DigestUpdate(&md_ctx,&rec_char,1);

 	p=md;

 	s2n(rec->length,p);

 	EVP_DigestUpdate(&md_ctx,md,2);

 	EVP_DigestUpdate(&md_ctx,rec->input,rec->length);

 	EVP_DigestFinal_ex( &md_ctx,md,NULL);

 	EVP_DigestInit_ex(  &md_ctx,hash, NULL);

 	EVP_DigestUpdate(&md_ctx,mac_sec,md_size);

 	EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);

 	EVP_DigestUpdate(&md_ctx,md,md_size);

 	EVP_DigestFinal_ex( &md_ctx,md,&md_size);

 	EVP_MD_CTX_cleanup(&md_ctx);

 	ssl3_record_sequence_update(seq);

 	return(md_size);

 	}

 void ssl3_record_sequence_update(unsigned char *seq)

 	{

 	int i;

 	for (i=7; i>=0; i--)

 		{

 		++seq[i];

 		if (seq[i] != 0) break; 

 		}

 	}

 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,

 	     int len)

 	{

 #ifndef EMULATOR	

 		static const unsigned char *salt[3]={

 #else

 		static const unsigned char *const salt[3]={

 #endif

 #ifndef CHARSET_EBCDIC

 		(const unsigned char *)"A",

 		(const unsigned char *)"BB",

 		(const unsigned char *)"CCC",

 #else

 		(const unsigned char *)"\x41",

 		(const unsigned char *)"\x42\x42",

 		(const unsigned char *)"\x43\x43\x43",

 #endif

 		};

 	unsigned char buf[EVP_MAX_MD_SIZE];

 	EVP_MD_CTX ctx;

 	int i,ret=0;

 	unsigned int n;

 	EVP_MD_CTX_init(&ctx);

 	for (i=0; i<3; i++)

 		{

 		EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);

 		EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));

 		EVP_DigestUpdate(&ctx,p,len);

 		EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),

 			SSL3_RANDOM_SIZE);

 		EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),

 			SSL3_RANDOM_SIZE);

 		EVP_DigestFinal_ex(&ctx,buf,&n);

 		EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);

 		EVP_DigestUpdate(&ctx,p,len);

 		EVP_DigestUpdate(&ctx,buf,n);

 		EVP_DigestFinal_ex(&ctx,out,&n);

 		out+=n;

 		ret+=n;

 		}

 	EVP_MD_CTX_cleanup(&ctx);

 	return(ret);

 	}

 int ssl3_alert_code(int code)

 	{

 	switch (code)

 		{

 	case SSL_AD_CLOSE_NOTIFY:	return(SSL3_AD_CLOSE_NOTIFY);

 	case SSL_AD_UNEXPECTED_MESSAGE:	return(SSL3_AD_UNEXPECTED_MESSAGE);

 	case SSL_AD_BAD_RECORD_MAC:	return(SSL3_AD_BAD_RECORD_MAC);

 	case SSL_AD_DECRYPTION_FAILED:	return(SSL3_AD_BAD_RECORD_MAC);

 	case SSL_AD_RECORD_OVERFLOW:	return(SSL3_AD_BAD_RECORD_MAC);

 	case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);

 	case SSL_AD_HANDSHAKE_FAILURE:	return(SSL3_AD_HANDSHAKE_FAILURE);

 	case SSL_AD_NO_CERTIFICATE:	return(SSL3_AD_NO_CERTIFICATE);

 	case SSL_AD_BAD_CERTIFICATE:	return(SSL3_AD_BAD_CERTIFICATE);

 	case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);

 	case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);

 	case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);

 	case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);

 	case SSL_AD_ILLEGAL_PARAMETER:	return(SSL3_AD_ILLEGAL_PARAMETER);

 	case SSL_AD_UNKNOWN_CA:		return(SSL3_AD_BAD_CERTIFICATE);

 	case SSL_AD_ACCESS_DENIED:	return(SSL3_AD_HANDSHAKE_FAILURE);

 	case SSL_AD_DECODE_ERROR:	return(SSL3_AD_HANDSHAKE_FAILURE);

 	case SSL_AD_DECRYPT_ERROR:	return(SSL3_AD_HANDSHAKE_FAILURE);

 	case SSL_AD_EXPORT_RESTRICTION:	return(SSL3_AD_HANDSHAKE_FAILURE);

 	case SSL_AD_PROTOCOL_VERSION:	return(SSL3_AD_HANDSHAKE_FAILURE);

 	case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);

 	case SSL_AD_INTERNAL_ERROR:	return(SSL3_AD_HANDSHAKE_FAILURE);

 	case SSL_AD_USER_CANCELLED:	return(SSL3_AD_HANDSHAKE_FAILURE);

 	case SSL_AD_NO_RENEGOTIATION:	return(-1); /* Don't send it :-) */

 	default:			return(-1);

 		}

 	}