/* 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;

			}

		}