/* ssl/t1_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).

  *

  */

 #include <stdio.h>

 #include "ssl_locl.h"

 #include <openssl/comp.h>

 #include <openssl/evp.h>

 #include <openssl/hmac.h>

 #include <openssl/md5.h>

 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,

 			int sec_len, unsigned char *seed, int seed_len,

 			unsigned char *out, int olen)

 	{

 	int chunk,n;

 	unsigned int j;

 	HMAC_CTX ctx;

 	HMAC_CTX ctx_tmp;

 	unsigned char A1[EVP_MAX_MD_SIZE];

 	unsigned int A1_len;

 	chunk=EVP_MD_size(md);

 	HMAC_CTX_init(&ctx);

 	HMAC_CTX_init(&ctx_tmp);

 	HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);

 	HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);

 	HMAC_Update(&ctx,seed,seed_len);

 	HMAC_Final(&ctx,A1,&A1_len);

 	n=0;

 	for (;;)

 		{

 		HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */

 		HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */

 		HMAC_Update(&ctx,A1,A1_len);

 		HMAC_Update(&ctx_tmp,A1,A1_len);

 		HMAC_Update(&ctx,seed,seed_len);

 		if (olen > chunk)

 			{

 			HMAC_Final(&ctx,out,&j);

 			out+=j;

 			olen-=j;

 			HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */

 			}

 		else	/* last one */

 			{

 			HMAC_Final(&ctx,A1,&A1_len);

 			memcpy(out,A1,olen);

 			break;

 			}

 		}

 	HMAC_CTX_cleanup(&ctx);

 	HMAC_CTX_cleanup(&ctx_tmp);

 	OPENSSL_cleanse(A1,sizeof(A1));

 	}

 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,

 		     unsigned char *label, int label_len,

 		     const unsigned char *sec, int slen, unsigned char *out1,

 		     unsigned char *out2, int olen)

 	{

 	int len,i;

 	const unsigned char *S1,*S2;

 	len=slen/2;

 	S1=sec;

 	S2= &(sec[len]);

 	len+=(slen&1); /* add for odd, make longer */

 	tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);

 	tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);

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

 		out1[i]^=out2[i];

 	}

 static void tls1_generate_key_block(SSL *s, unsigned char *km,

 	     unsigned char *tmp, int num)

 	{

 	unsigned char *p;

 	unsigned char buf[SSL3_RANDOM_SIZE*2+

 		TLS_MD_MAX_CONST_SIZE];

 	p=buf;

 	memcpy(p,TLS_MD_KEY_EXPANSION_CONST,

 		TLS_MD_KEY_EXPANSION_CONST_SIZE);

 	p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;

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

 	p+=SSL3_RANDOM_SIZE;

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

 	p+=SSL3_RANDOM_SIZE;

 	tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),

 		 s->session->master_key,s->session->master_key_length,

 		 km,tmp,num);

 #ifdef KSSL_DEBUG

 	printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",

                 s->session->master_key_length);

 	{

         int i;

         for (i=0; i < s->session->master_key_length; i++)

                 {

                 printf("%02X", s->session->master_key[i]);

                 }

         printf("\n");  }

 #endif    /* KSSL_DEBUG */

 	}

 int tls1_change_cipher_state(SSL *s, int which)

 	{

 	static const unsigned char empty[]="";

 	unsigned char *p,*key_block,*mac_secret;

 	unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+

 		SSL3_RANDOM_SIZE*2];

 	unsigned char tmp1[EVP_MAX_KEY_LENGTH];

 	unsigned char tmp2[EVP_MAX_KEY_LENGTH];

 	unsigned char iv1[EVP_MAX_IV_LENGTH*2];

 	unsigned char iv2[EVP_MAX_IV_LENGTH*2];

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

 	int client_write;

 	EVP_CIPHER_CTX *dd;

 	const EVP_CIPHER *c;

 #ifndef OPENSSL_NO_COMP

 	const SSL_COMP *comp;

 #endif

 	const EVP_MD *m;

 	int is_export,n,i,j,k,exp_label_len,cl;

 	int reuse_dd = 0;

 	is_export=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

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

 #endif

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

 #ifdef KSSL_DEBUG

 	printf("tls1_change_cipher_state(which= %d) w/\n", which);

 	printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,

                 comp);

 	printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);

 	printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",

                 c->nid,c->block_size,c->key_len,c->iv_len);

 	printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);

 	{

         int i;

         for (i=0; i<s->s3->tmp.key_block_length; i++)

 		printf("%02x", key_block[i]);  printf("\n");

         }

 #endif	/* KSSL_DEBUG */

 	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

 		if (s->expand != NULL)

 			{

 			COMP_CTX_free(s->expand);

 			s->expand=NULL;

 			}

 		if (comp != NULL)

 			{

 			s->expand=COMP_CTX_new(comp->method);

 			if (s->expand == NULL)

 				{

 				SSLerr(SSL_F_TLS1_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_ENCRYPTED_LENGTH);

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

 				goto err;

 			}

 #endif

 		/* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */

  		if (s->version != DTLS1_VERSION)

 			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

 		if (s->compress != NULL)

 			{

 			COMP_CTX_free(s->compress);

 			s->compress=NULL;

 			}

 		if (comp != NULL)

 			{

 			s->compress=COMP_CTX_new(comp->method);

 			if (s->compress == NULL)

 				{

 				SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);

 				goto err2;

 				}

 			}

 #endif

 		/* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */

  		if (s->version != DTLS1_VERSION)

 			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_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?

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

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

 	k=EVP_CIPHER_iv_length(c);

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

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

 	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;

 		exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;

 		exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;

 		client_write=1;

 		}

 	else

 		{

 		n=i;

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

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

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

 		exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;

 		exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;

 		client_write=0;

 		}

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

 		{

 		SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);

 		goto err2;

 		}

 	memcpy(mac_secret,ms,i);

 #ifdef TLS_DEBUG

 printf("which = %04X\nmac key=",which);

 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }

 #endif

 	if (is_export)

 		{

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

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

 		 */

 		p=buf;

 		memcpy(p,exp_label,exp_label_len);

 		p+=exp_label_len;

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

 		p+=SSL3_RANDOM_SIZE;

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

 		p+=SSL3_RANDOM_SIZE;

 		tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,

 			 tmp1,tmp2,EVP_CIPHER_key_length(c));

 		key=tmp1;

 		if (k > 0)

 			{

 			p=buf;

 			memcpy(p,TLS_MD_IV_BLOCK_CONST,

 				TLS_MD_IV_BLOCK_CONST_SIZE);

 			p+=TLS_MD_IV_BLOCK_CONST_SIZE;

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

 			p+=SSL3_RANDOM_SIZE;

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

 			p+=SSL3_RANDOM_SIZE;

 			tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,

 				 iv1,iv2,k*2);

 			if (client_write)

 				iv=iv1;

 			else

 				iv= &(iv1[k]);

 			}

 		}

 	s->session->key_arg_length=0;

 #ifdef KSSL_DEBUG

 	{

         int i;

 	printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");

 	printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);

 	printf("\n");

 	printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);

 	printf("\n");

 	}

 #endif	/* KSSL_DEBUG */

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

 #ifdef TLS_DEBUG

 printf("which = %04X\nkey=",which);

 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }

 printf("\niv=");

 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }

 printf("\n");

 #endif

 	OPENSSL_cleanse(tmp1,sizeof(tmp1));

 	OPENSSL_cleanse(tmp2,sizeof(tmp1));

 	OPENSSL_cleanse(iv1,sizeof(iv1));

 	OPENSSL_cleanse(iv2,sizeof(iv2));

 	return(1);

 err:

 	SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);

 err2:

 	return(0);

 	}

 int tls1_setup_key_block(SSL *s)

 	{

 	unsigned char *p1,*p2;

 	const EVP_CIPHER *c;

 	const EVP_MD *hash;

 	int num;

 	SSL_COMP *comp;

 #ifdef KSSL_DEBUG

 	printf ("tls1_setup_key_block()\n");

 #endif	/* KSSL_DEBUG */

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

 		return(1);

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

 		{

 		SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);

 		return(0);

 		}

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

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

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

 	num*=2;

 	ssl3_cleanup_key_block(s);

 	if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)

 		goto err;

 	if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)

 		goto err;

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

 	s->s3->tmp.key_block=p1;

 #ifdef TLS_DEBUG

 printf("client random\n");

 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }

 printf("server random\n");

 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }

 printf("pre-master\n");

 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }

 #endif

 	tls1_generate_key_block(s,p1,p2,num);

 	OPENSSL_cleanse(p2,num);

 	OPENSSL_free(p2);

 #ifdef TLS_DEBUG

 printf("\nkey block\n");

 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }

 #endif

 	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(1);

 err:

 	SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);

 	return(0);

 	}

 int tls1_enc(SSL *s, int send)

 	{

 	SSL3_RECORD *rec;

 	EVP_CIPHER_CTX *ds;

 	unsigned long l;

 	int bs,i,ii,j,k,n=0;

 	const EVP_CIPHER *enc;

 	if (send)

 		{

 		if (s->write_hash != NULL)

 			n=EVP_MD_size(s->write_hash);

 		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

 		{

 		if (s->read_hash != NULL)

 			n=EVP_MD_size(s->read_hash);

 		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);

 		}

 #ifdef KSSL_DEBUG

 	printf("tls1_enc(%d)\n", send);

 #endif    /* KSSL_DEBUG */

 	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);

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

 			{

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

 			/* Add weird padding of upto 256 bytes */

 			/* we need to add 'i' padding bytes of value j */

 			j=i-1;

 			if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)

 				{

 				if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)

 					j++;

 				}

 			for (k=(int)l; k<(int)(l+i); k++)

 				rec->input[k]=j;

 			l+=i;

 			rec->length+=i;

 			}

 #ifdef KSSL_DEBUG

 		{

                 unsigned long ui;

 		printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",

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

 		printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",

                         ds->buf_len, ds->cipher->key_len,

                         DES_KEY_SZ, DES_SCHEDULE_SZ,

                         ds->cipher->iv_len);

 		printf("\t\tIV: ");

 		for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);

 		printf("\n");

 		printf("\trec->input=");

 		for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);

 		printf("\n");

 		}

 #endif	/* KSSL_DEBUG */

 		if (!send)

 			{

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

 				{

 				SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);

 				ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);

 				return 0;

 				}

 			}

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

 #ifdef KSSL_DEBUG

 		{

                 unsigned long i;

                 printf("\trec->data=");

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

                         printf(" %02x", rec->data[i]);  printf("\n");

                 }

 #endif	/* KSSL_DEBUG */

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

 			{

 			ii=i=rec->data[l-1]; /* padding_length */

 			i++;

 			/* NB: if compression is in operation the first packet

 			 * may not be of even length so the padding bug check

 			 * cannot be performed. This bug workaround has been

 			 * around since SSLeay so hopefully it is either fixed

 			 * now or no buggy implementation supports compression 

 			 * [steve]

 			 */

 			if ( (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)

 				&& !s->expand)

 				{

 				/* First packet is even in size, so check */

 				if ((memcmp(s->s3->read_sequence,

 					"\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))

 					s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;

 				if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)

 					i--;

 				}

 			/* TLS 1.0 does not bound the number of padding bytes by the block size.

 			 * All of them must have value 'padding_length'. */

 			if (i > (int)rec->length)

 				{

 				/* 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;

 				}

 			for (j=(int)(l-i); j<(int)l; j++)

 				{

 				if (rec->data[j] != ii)

 					{

 					/* Incorrect padding */

 					return -1;

 					}

 				}

 			rec->length-=i;

 			}

 		}

 	return(1);

 	}

 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)

 	{

 	unsigned int ret;

 	EVP_MD_CTX ctx;

 	EVP_MD_CTX_init(&ctx);

 	EVP_MD_CTX_copy_ex(&ctx,in_ctx);

 	EVP_DigestFinal_ex(&ctx,out,&ret);

 	EVP_MD_CTX_cleanup(&ctx);

 	return((int)ret);

 	}

 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,

 	     const char *str, int slen, unsigned char *out)

 	{

 	unsigned int i;

 	EVP_MD_CTX ctx;

 	unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];

 	unsigned char *q,buf2[12];

 	q=buf;

 	memcpy(q,str,slen);

 	q+=slen;

 	EVP_MD_CTX_init(&ctx);

 	EVP_MD_CTX_copy_ex(&ctx,in1_ctx);

 	EVP_DigestFinal_ex(&ctx,q,&i);

 	q+=i;

 	EVP_MD_CTX_copy_ex(&ctx,in2_ctx);

 	EVP_DigestFinal_ex(&ctx,q,&i);

 	q+=i;

 	tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),

 		s->session->master_key,s->session->master_key_length,

 		out,buf2,sizeof buf2);

 	EVP_MD_CTX_cleanup(&ctx);

 	return sizeof buf2;

 	}

 int tls1_mac(SSL *ssl, unsigned char *md, int send)

 	{

 	SSL3_RECORD *rec;

 	unsigned char *mac_sec,*seq;

 	const EVP_MD *hash;

 	unsigned int md_size;

 	int i;

 	HMAC_CTX hmac;

 	unsigned char buf[5]; 

 	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);

 	buf[0]=rec->type;

 	if (ssl->version == DTLS1_VERSION && ssl->client_version == DTLS1_BAD_VER)

 		{

 	buf[1]=TLS1_VERSION_MAJOR;

 	buf[2]=TLS1_VERSION_MINOR;

 		}

 	else	{

 		buf[1]=(unsigned char)(ssl->version>>8);

 		buf[2]=(unsigned char)(ssl->version);

 		}

 	buf[3]=rec->length>>8;

 	buf[4]=rec->length&0xff;

 	/* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */

 	HMAC_CTX_init(&hmac);

 	HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);

 	if (ssl->version == DTLS1_VERSION && ssl->client_version != DTLS1_BAD_VER)

 		{

 		unsigned char dtlsseq[8],*p=dtlsseq;

 		s2n(send?ssl->d1->w_epoch:ssl->d1->r_epoch, p);

 		memcpy (p,&seq[2],6);

 		HMAC_Update(&hmac,dtlsseq,8);

 		}

 	else

 		HMAC_Update(&hmac,seq,8);

 	HMAC_Update(&hmac,buf,5);

 	HMAC_Update(&hmac,rec->input,rec->length);

 	HMAC_Final(&hmac,md,&md_size);

 	HMAC_CTX_cleanup(&hmac);

 #ifdef TLS_DEBUG

 printf("sec=");

 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }

 printf("seq=");

 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }

 printf("buf=");

 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }

 printf("rec=");

 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }

 #endif

 	if ( SSL_version(ssl) != DTLS1_VERSION)

 		{

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

 			{

 			++seq[i];

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

 			}

 		}

 #ifdef TLS_DEBUG

 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }

 #endif

 	return(md_size);

 	}

 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,

 	     int len)

 	{

 	unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];

 	unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];

 #ifdef KSSL_DEBUG

 	printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);

 #endif	/* KSSL_DEBUG */

 	/* Setup the stuff to munge */

 	memcpy(buf,TLS_MD_MASTER_SECRET_CONST,

 		TLS_MD_MASTER_SECRET_CONST_SIZE);

 	memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),

 		s->s3->client_random,SSL3_RANDOM_SIZE);

 	memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),

 		s->s3->server_random,SSL3_RANDOM_SIZE);

 	tls1_PRF(s->ctx->md5,s->ctx->sha1,

 		buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,

 		s->session->master_key,buff,sizeof buff);

 #ifdef KSSL_DEBUG

 	printf ("tls1_generate_master_secret() complete\n");

 #endif	/* KSSL_DEBUG */

 	return(SSL3_MASTER_SECRET_SIZE);

 	}

 int tls1_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(TLS1_AD_DECRYPTION_FAILED);

 	case SSL_AD_RECORD_OVERFLOW:	return(TLS1_AD_RECORD_OVERFLOW);

 	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(-1);

 	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(TLS1_AD_UNKNOWN_CA);

 	case SSL_AD_ACCESS_DENIED:	return(TLS1_AD_ACCESS_DENIED);

 	case SSL_AD_DECODE_ERROR:	return(TLS1_AD_DECODE_ERROR);

 	case SSL_AD_DECRYPT_ERROR:	return(TLS1_AD_DECRYPT_ERROR);

 	case SSL_AD_EXPORT_RESTRICTION:	return(TLS1_AD_EXPORT_RESTRICTION);

 	case SSL_AD_PROTOCOL_VERSION:	return(TLS1_AD_PROTOCOL_VERSION);

 	case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);

 	case SSL_AD_INTERNAL_ERROR:	return(TLS1_AD_INTERNAL_ERROR);

 	case SSL_AD_USER_CANCELLED:	return(TLS1_AD_USER_CANCELLED);

 	case SSL_AD_NO_RENEGOTIATION:	return(TLS1_AD_NO_RENEGOTIATION);

 	case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return 

 					  (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);

 	default:			return(-1);

 		}

 	}