text: /* 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) 1998-2007 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 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 <openssl/evp.h>
  #include <openssl/md5.h>
  
  static const unsigned char ssl3_pad_1[48]={
  	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 };
  
  static const unsigned char ssl3_pad_2[48]={
  	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, int md_nid,
  	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_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
  	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,*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;
  	/* m == NULL will lead to a crash later */
  	OPENSSL_assert(m);
  #ifndef OPENSSL_NO_COMP
  	if (s->s3->tmp.new_compression == NULL)
  		comp=NULL;
  	else
  		comp=s->s3->tmp.new_compression->method;
  #endif
  
  	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;
  
  		ssl_replace_hash(&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;
  		ssl_replace_hash(&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);
  	if (i < 0)
  		goto err2;
  	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]);
  			}
  		}
  
  	EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
  
  #ifdef OPENSSL_SSL_TRACE_CRYPTO
  	if (s->msg_callback)
  		{
   
  		int wh = which & SSL3_CC_WRITE ?
  				TLS1_RT_CRYPTO_WRITE : TLS1_RT_CRYPTO_READ;
  		s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_MAC,
  						mac_secret, EVP_MD_size(m),
  						s, s->msg_callback_arg);
  		if (c->key_len)
  			s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,
  						key, c->key_len,
  						s, s->msg_callback_arg);
  		if (k)
  			{
  			s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_IV,
  						iv, k, s, s->msg_callback_arg);
  			}
  		}
  #endif
  
  	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,NULL,NULL,&comp, 0))
  		{
  		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_MD_size(hash);
  	if (num < 0)
  		return 0;
  
  	num=EVP_CIPHER_key_length(c)+num+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->algorithm_enc == SSL_eNULL)
  				s->s3->need_empty_fragments = 0;
  			
  #ifndef OPENSSL_NO_RC4
  			if (s->session->cipher->algorithm_enc == 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;
  	}
  
  /* ssl3_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively.
   *
   * Returns:
   *   0: (in non-constant time) if the record is publically invalid (i.e. too
   *       short etc).
   *   1: if the record's padding is valid / the encryption was successful.
   *   -1: if the record's padding is invalid or, if sending, an internal error
   *       occurred.
   */
  int ssl3_enc(SSL *s, int send)
  	{
  	SSL3_RECORD *rec;
  	EVP_CIPHER_CTX *ds;
  	unsigned long l;
  	int bs,i,mac_size=0;
  	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;
  			/* the last of these zero bytes will be overwritten
  			 * with the padding length. */
  			memset(&rec->input[rec->length], 0, i);
  			rec->length+=i;
  			rec->input[l-1]=(i-1);
  			}
  		
  		if (!send)
  			{
  			if (l == 0 || l%bs != 0)
  				return 0;
  			/* otherwise, rec->length >= bs */
  			}
  		
  		if(EVP_Cipher(ds,rec->data,rec->input,l) < 1)
  			return -1;
  
  		if (EVP_MD_CTX_md(s->read_hash) != NULL)
  			mac_size = EVP_MD_CTX_size(s->read_hash);
  		if ((bs != 1) && !send)
  			return ssl3_cbc_remove_padding(s, rec, bs, mac_size);
  		}
  	return(1);
  	}
  
  void ssl3_init_finished_mac(SSL *s)
  	{
  	if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer);
  	if (s->s3->handshake_dgst) ssl3_free_digest_list(s);
      s->s3->handshake_buffer=BIO_new(BIO_s_mem());	
  	(void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE);
  	}
  
  void ssl3_free_digest_list(SSL *s) 
  	{
  	int i;
  	if (!s->s3->handshake_dgst) return;
  	for (i=0;i<SSL_MAX_DIGEST;i++) 
  		{
  		if (s->s3->handshake_dgst[i])
  			EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]);
  		}
  	OPENSSL_free(s->s3->handshake_dgst);
  	s->s3->handshake_dgst=NULL;
  	}	
  
  
  
  void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
  	{
  	if (s->s3->handshake_buffer && !(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) 
  		{
  		BIO_write (s->s3->handshake_buffer,(void *)buf,len);
  		} 
  	else 
  		{
  		int i;
  		for (i=0;i< SSL_MAX_DIGEST;i++) 
  			{
  			if (s->s3->handshake_dgst[i]!= NULL)
  			EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len);
  			}
  		}	
  	}
  
  int ssl3_digest_cached_records(SSL *s)
  	{
  	int i;
  	long mask;
  	const EVP_MD *md;
  	long hdatalen;
  	void *hdata;
  
  	/* Allocate handshake_dgst array */
  	ssl3_free_digest_list(s);
  	s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
  	if (s->s3->handshake_dgst == NULL)
  		{
  		SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_MALLOC_FAILURE);
  		return 0;
  		}
  	memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *));
  	hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata);
  	if (hdatalen <= 0)
  		{
  		SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);
  		return 0;
  		}
  
  	/* Loop through bitso of algorithm2 field and create MD_CTX-es */
  	for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++) 
  		{
  		if ((mask & ssl_get_algorithm2(s)) && md) 
  			{
  			s->s3->handshake_dgst[i]=EVP_MD_CTX_create();
  			if (EVP_MD_nid(md) == NID_md5)
  				{
  				EVP_MD_CTX_set_flags(s->s3->handshake_dgst[i],
  						EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
  				}
  			EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL);
  			EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen);
  			} 
  		else 
  			{	
  			s->s3->handshake_dgst[i]=NULL;
  			}
  		}
  	if (!(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE))
  		{
  		/* Free handshake_buffer BIO */
  		BIO_free(s->s3->handshake_buffer);
  		s->s3->handshake_buffer = NULL;
  		}
  
  	return 1;
  	}
  
  int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p)
  	{
  	return(ssl3_handshake_mac(s,md_nid,NULL,0,p));
  	}
  int ssl3_final_finish_mac(SSL *s, 
  	     const char *sender, int len, unsigned char *p)
  	{
  	int ret, sha1len;
  	ret=ssl3_handshake_mac(s,NID_md5,sender,len,p);
  	if(ret == 0)
  		return 0;
  
  	p+=ret;
  
  	sha1len=ssl3_handshake_mac(s,NID_sha1,sender,len,p);
  	if(sha1len == 0)
  		return 0;
  
  	ret+=sha1len;
  	return(ret);
  	}
  static int ssl3_handshake_mac(SSL *s, int md_nid,
  	     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,*d=NULL;
  
  	if (s->s3->handshake_buffer) 
  		if (!ssl3_digest_cached_records(s))
  			return 0;
  
  	/* Search for digest of specified type in the handshake_dgst
  	 * array*/
  	for (i=0;i<SSL_MAX_DIGEST;i++) 
  		{
  		  if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid) 
  		  	{
  		  	d=s->s3->handshake_dgst[i];
  			break;
  			}
  		}
  	if (!d) {
  		SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST);
  		return 0;
  	}	
  	EVP_MD_CTX_init(&ctx);
  	EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
  	EVP_MD_CTX_copy_ex(&ctx,d);
  	n=EVP_MD_CTX_size(&ctx);
  	if (n < 0)
  		return 0;
  
  	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 n_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_CTX *hash;
  	unsigned char *p,rec_char;
  	size_t md_size;
  	int npad;
  	int t;
  
  	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;
  		}
  
  	t=EVP_MD_CTX_size(hash);
  	if (t < 0)
  		return -1;
  	md_size=t;
  	npad=(48/md_size)*md_size;
  
  	if (!send &&
  	    EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
  	    ssl3_cbc_record_digest_supported(hash))
  		{
  		/* This is a CBC-encrypted record. We must avoid leaking any
  		 * timing-side channel information about how many blocks of
  		 * data we are hashing because that gives an attacker a
  		 * timing-oracle. */
  
  		/* npad is, at most, 48 bytes and that's with MD5:
  		 *   16 + 48 + 8 (sequence bytes) + 1 + 2 = 75.
  		 *
  		 * With SHA-1 (the largest hash speced for SSLv3) the hash size
  		 * goes up 4, but npad goes down by 8, resulting in a smaller
  		 * total size. */
  		unsigned char header[75];
  		unsigned j = 0;
  		memcpy(header+j, mac_sec, md_size);
  		j += md_size;
  		memcpy(header+j, ssl3_pad_1, npad);
  		j += npad;
  		memcpy(header+j, seq, 8);
  		j += 8;
  		header[j++] = rec->type;
  		header[j++] = rec->length >> 8;
  		header[j++] = rec->length & 0xff;
  
  		ssl3_cbc_digest_record(
  			hash,
  			md, &md_size,
  			header, rec->input,
  			rec->length + md_size, rec->orig_len,
  			mac_sec, md_size,
  			1 /* is SSLv3 */);
  		}
  	else
  		{
  		unsigned int md_size_u;
  		/* Chop the digest off the end :-) */
  		EVP_MD_CTX_init(&md_ctx);
  
  		EVP_MD_CTX_copy_ex( &md_ctx,hash);
  		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_MD_CTX_copy_ex( &md_ctx,hash);
  		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_u);
  		md_size = md_size_u;
  
  		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)
  	{
  	static const unsigned char *salt[3]={
  #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;
  #ifdef OPENSSL_SSL_TRACE_CRYPTO
  	unsigned char *tmpout = out;
  #endif
  
  	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);
  
  #ifdef OPENSSL_SSL_TRACE_CRYPTO
  	if (s->msg_callback)
  		{
  		s->msg_callback(2, s->version, TLS1_RT_CRYPTO_PREMASTER,
  						p, len, s, s->msg_callback_arg);
  		s->msg_callback(2, s->version, TLS1_RT_CRYPTO_CLIENT_RANDOM,
  					s->s3->client_random, SSL3_RANDOM_SIZE,
  						s, s->msg_callback_arg);
  		s->msg_callback(2, s->version, TLS1_RT_CRYPTO_SERVER_RANDOM,
  					s->s3->server_random, SSL3_RANDOM_SIZE,
  					s, s->msg_callback_arg);
  		s->msg_callback(2, s->version, TLS1_RT_CRYPTO_MASTER,
  					tmpout, SSL3_MASTER_SECRET_SIZE,
  					s, s->msg_callback_arg);
  		}
  #endif
  	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 :-) */
  	case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE);
  	case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE);
  	case SSL_AD_UNRECOGNIZED_NAME:	return(SSL3_AD_HANDSHAKE_FAILURE);
  	case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE);
  	case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE);
  	case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
  	case SSL_AD_INAPPROPRIATE_FALLBACK:return(TLS1_AD_INAPPROPRIATE_FALLBACK);
  	default:			return(-1);
  		}
  	}
  