sl@0: /* ssl/t1_enc.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: /* ====================================================================
sl@0:  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
sl@0:  *
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  *
sl@0:  * 1. Redistributions of source code must retain the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer. 
sl@0:  *
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in
sl@0:  *    the documentation and/or other materials provided with the
sl@0:  *    distribution.
sl@0:  *
sl@0:  * 3. All advertising materials mentioning features or use of this
sl@0:  *    software must display the following acknowledgment:
sl@0:  *    "This product includes software developed by the OpenSSL Project
sl@0:  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
sl@0:  *
sl@0:  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
sl@0:  *    endorse or promote products derived from this software without
sl@0:  *    prior written permission. For written permission, please contact
sl@0:  *    openssl-core@openssl.org.
sl@0:  *
sl@0:  * 5. Products derived from this software may not be called "OpenSSL"
sl@0:  *    nor may "OpenSSL" appear in their names without prior written
sl@0:  *    permission of the OpenSSL Project.
sl@0:  *
sl@0:  * 6. Redistributions of any form whatsoever must retain the following
sl@0:  *    acknowledgment:
sl@0:  *    "This product includes software developed by the OpenSSL Project
sl@0:  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
sl@0:  *
sl@0:  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
sl@0:  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
sl@0:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
sl@0:  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
sl@0:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
sl@0:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
sl@0:  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
sl@0:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
sl@0:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
sl@0:  * OF THE POSSIBILITY OF SUCH DAMAGE.
sl@0:  * ====================================================================
sl@0:  *
sl@0:  * This product includes cryptographic software written by Eric Young
sl@0:  * (eay@cryptsoft.com).  This product includes software written by Tim
sl@0:  * Hudson (tjh@cryptsoft.com).
sl@0:  *
sl@0:  */
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include "ssl_locl.h"
sl@0: #include <openssl/comp.h>
sl@0: #include <openssl/evp.h>
sl@0: #include <openssl/hmac.h>
sl@0: #include <openssl/md5.h>
sl@0: 
sl@0: static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
sl@0: 			int sec_len, unsigned char *seed, int seed_len,
sl@0: 			unsigned char *out, int olen)
sl@0: 	{
sl@0: 	int chunk,n;
sl@0: 	unsigned int j;
sl@0: 	HMAC_CTX ctx;
sl@0: 	HMAC_CTX ctx_tmp;
sl@0: 	unsigned char A1[EVP_MAX_MD_SIZE];
sl@0: 	unsigned int A1_len;
sl@0: 	
sl@0: 	chunk=EVP_MD_size(md);
sl@0: 
sl@0: 	HMAC_CTX_init(&ctx);
sl@0: 	HMAC_CTX_init(&ctx_tmp);
sl@0: 	HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
sl@0: 	HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
sl@0: 	HMAC_Update(&ctx,seed,seed_len);
sl@0: 	HMAC_Final(&ctx,A1,&A1_len);
sl@0: 
sl@0: 	n=0;
sl@0: 	for (;;)
sl@0: 		{
sl@0: 		HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
sl@0: 		HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
sl@0: 		HMAC_Update(&ctx,A1,A1_len);
sl@0: 		HMAC_Update(&ctx_tmp,A1,A1_len);
sl@0: 		HMAC_Update(&ctx,seed,seed_len);
sl@0: 
sl@0: 		if (olen > chunk)
sl@0: 			{
sl@0: 			HMAC_Final(&ctx,out,&j);
sl@0: 			out+=j;
sl@0: 			olen-=j;
sl@0: 			HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
sl@0: 			}
sl@0: 		else	/* last one */
sl@0: 			{
sl@0: 			HMAC_Final(&ctx,A1,&A1_len);
sl@0: 			memcpy(out,A1,olen);
sl@0: 			break;
sl@0: 			}
sl@0: 		}
sl@0: 	HMAC_CTX_cleanup(&ctx);
sl@0: 	HMAC_CTX_cleanup(&ctx_tmp);
sl@0: 	OPENSSL_cleanse(A1,sizeof(A1));
sl@0: 	}
sl@0: 
sl@0: static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
sl@0: 		     unsigned char *label, int label_len,
sl@0: 		     const unsigned char *sec, int slen, unsigned char *out1,
sl@0: 		     unsigned char *out2, int olen)
sl@0: 	{
sl@0: 	int len,i;
sl@0: 	const unsigned char *S1,*S2;
sl@0: 
sl@0: 	len=slen/2;
sl@0: 	S1=sec;
sl@0: 	S2= &(sec[len]);
sl@0: 	len+=(slen&1); /* add for odd, make longer */
sl@0: 
sl@0: 	
sl@0: 	tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
sl@0: 	tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
sl@0: 
sl@0: 	for (i=0; i<olen; i++)
sl@0: 		out1[i]^=out2[i];
sl@0: 	}
sl@0: 
sl@0: static void tls1_generate_key_block(SSL *s, unsigned char *km,
sl@0: 	     unsigned char *tmp, int num)
sl@0: 	{
sl@0: 	unsigned char *p;
sl@0: 	unsigned char buf[SSL3_RANDOM_SIZE*2+
sl@0: 		TLS_MD_MAX_CONST_SIZE];
sl@0: 	p=buf;
sl@0: 
sl@0: 	memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
sl@0: 		TLS_MD_KEY_EXPANSION_CONST_SIZE);
sl@0: 	p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
sl@0: 	memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
sl@0: 	p+=SSL3_RANDOM_SIZE;
sl@0: 	memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
sl@0: 	p+=SSL3_RANDOM_SIZE;
sl@0: 
sl@0: 	tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
sl@0: 		 s->session->master_key,s->session->master_key_length,
sl@0: 		 km,tmp,num);
sl@0: #ifdef KSSL_DEBUG
sl@0: 	printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
sl@0:                 s->session->master_key_length);
sl@0: 	{
sl@0:         int i;
sl@0:         for (i=0; i < s->session->master_key_length; i++)
sl@0:                 {
sl@0:                 printf("%02X", s->session->master_key[i]);
sl@0:                 }
sl@0:         printf("\n");  }
sl@0: #endif    /* KSSL_DEBUG */
sl@0: 	}
sl@0: 
sl@0: int tls1_change_cipher_state(SSL *s, int which)
sl@0: 	{
sl@0: 	static const unsigned char empty[]="";
sl@0: 	unsigned char *p,*key_block,*mac_secret;
sl@0: 	unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
sl@0: 		SSL3_RANDOM_SIZE*2];
sl@0: 	unsigned char tmp1[EVP_MAX_KEY_LENGTH];
sl@0: 	unsigned char tmp2[EVP_MAX_KEY_LENGTH];
sl@0: 	unsigned char iv1[EVP_MAX_IV_LENGTH*2];
sl@0: 	unsigned char iv2[EVP_MAX_IV_LENGTH*2];
sl@0: 	unsigned char *ms,*key,*iv,*er1,*er2;
sl@0: 	int client_write;
sl@0: 	EVP_CIPHER_CTX *dd;
sl@0: 	const EVP_CIPHER *c;
sl@0: #ifndef OPENSSL_NO_COMP
sl@0: 	const SSL_COMP *comp;
sl@0: #endif
sl@0: 	const EVP_MD *m;
sl@0: 	int is_export,n,i,j,k,exp_label_len,cl;
sl@0: 	int reuse_dd = 0;
sl@0: 
sl@0: 	is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
sl@0: 	c=s->s3->tmp.new_sym_enc;
sl@0: 	m=s->s3->tmp.new_hash;
sl@0: #ifndef OPENSSL_NO_COMP
sl@0: 	comp=s->s3->tmp.new_compression;
sl@0: #endif
sl@0: 	key_block=s->s3->tmp.key_block;
sl@0: 
sl@0: #ifdef KSSL_DEBUG
sl@0: 	printf("tls1_change_cipher_state(which= %d) w/\n", which);
sl@0: 	printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
sl@0:                 comp);
sl@0: 	printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
sl@0: 	printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
sl@0:                 c->nid,c->block_size,c->key_len,c->iv_len);
sl@0: 	printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
sl@0: 	{
sl@0:         int i;
sl@0:         for (i=0; i<s->s3->tmp.key_block_length; i++)
sl@0: 		printf("%02x", key_block[i]);  printf("\n");
sl@0:         }
sl@0: #endif	/* KSSL_DEBUG */
sl@0: 
sl@0: 	if (which & SSL3_CC_READ)
sl@0: 		{
sl@0: 		if (s->enc_read_ctx != NULL)
sl@0: 			reuse_dd = 1;
sl@0: 		else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
sl@0: 			goto err;
sl@0: 		else
sl@0: 			/* make sure it's intialized in case we exit later with an error */
sl@0: 			EVP_CIPHER_CTX_init(s->enc_read_ctx);
sl@0: 		dd= s->enc_read_ctx;
sl@0: 		s->read_hash=m;
sl@0: #ifndef OPENSSL_NO_COMP
sl@0: 		if (s->expand != NULL)
sl@0: 			{
sl@0: 			COMP_CTX_free(s->expand);
sl@0: 			s->expand=NULL;
sl@0: 			}
sl@0: 		if (comp != NULL)
sl@0: 			{
sl@0: 			s->expand=COMP_CTX_new(comp->method);
sl@0: 			if (s->expand == NULL)
sl@0: 				{
sl@0: 				SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
sl@0: 				goto err2;
sl@0: 				}
sl@0: 			if (s->s3->rrec.comp == NULL)
sl@0: 				s->s3->rrec.comp=(unsigned char *)
sl@0: 					OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
sl@0: 			if (s->s3->rrec.comp == NULL)
sl@0: 				goto err;
sl@0: 			}
sl@0: #endif
sl@0: 		/* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
sl@0:  		if (s->version != DTLS1_VERSION)
sl@0: 			memset(&(s->s3->read_sequence[0]),0,8);
sl@0: 		mac_secret= &(s->s3->read_mac_secret[0]);
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		if (s->enc_write_ctx != NULL)
sl@0: 			reuse_dd = 1;
sl@0: 		else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
sl@0: 			goto err;
sl@0: 		else
sl@0: 			/* make sure it's intialized in case we exit later with an error */
sl@0: 			EVP_CIPHER_CTX_init(s->enc_write_ctx);
sl@0: 		dd= s->enc_write_ctx;
sl@0: 		s->write_hash=m;
sl@0: #ifndef OPENSSL_NO_COMP
sl@0: 		if (s->compress != NULL)
sl@0: 			{
sl@0: 			COMP_CTX_free(s->compress);
sl@0: 			s->compress=NULL;
sl@0: 			}
sl@0: 		if (comp != NULL)
sl@0: 			{
sl@0: 			s->compress=COMP_CTX_new(comp->method);
sl@0: 			if (s->compress == NULL)
sl@0: 				{
sl@0: 				SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
sl@0: 				goto err2;
sl@0: 				}
sl@0: 			}
sl@0: #endif
sl@0: 		/* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
sl@0:  		if (s->version != DTLS1_VERSION)
sl@0: 			memset(&(s->s3->write_sequence[0]),0,8);
sl@0: 		mac_secret= &(s->s3->write_mac_secret[0]);
sl@0: 		}
sl@0: 
sl@0: 	if (reuse_dd)
sl@0: 		EVP_CIPHER_CTX_cleanup(dd);
sl@0: 
sl@0: 	p=s->s3->tmp.key_block;
sl@0: 	i=EVP_MD_size(m);
sl@0: 	cl=EVP_CIPHER_key_length(c);
sl@0: 	j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
sl@0: 	               cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
sl@0: 	/* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
sl@0: 	k=EVP_CIPHER_iv_length(c);
sl@0: 	er1= &(s->s3->client_random[0]);
sl@0: 	er2= &(s->s3->server_random[0]);
sl@0: 	if (	(which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
sl@0: 		(which == SSL3_CHANGE_CIPHER_SERVER_READ))
sl@0: 		{
sl@0: 		ms=  &(p[ 0]); n=i+i;
sl@0: 		key= &(p[ n]); n+=j+j;
sl@0: 		iv=  &(p[ n]); n+=k+k;
sl@0: 		exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
sl@0: 		exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
sl@0: 		client_write=1;
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		n=i;
sl@0: 		ms=  &(p[ n]); n+=i+j;
sl@0: 		key= &(p[ n]); n+=j+k;
sl@0: 		iv=  &(p[ n]); n+=k;
sl@0: 		exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
sl@0: 		exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
sl@0: 		client_write=0;
sl@0: 		}
sl@0: 
sl@0: 	if (n > s->s3->tmp.key_block_length)
sl@0: 		{
sl@0: 		SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
sl@0: 		goto err2;
sl@0: 		}
sl@0: 
sl@0: 	memcpy(mac_secret,ms,i);
sl@0: #ifdef TLS_DEBUG
sl@0: printf("which = %04X\nmac key=",which);
sl@0: { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
sl@0: #endif
sl@0: 	if (is_export)
sl@0: 		{
sl@0: 		/* In here I set both the read and write key/iv to the
sl@0: 		 * same value since only the correct one will be used :-).
sl@0: 		 */
sl@0: 		p=buf;
sl@0: 		memcpy(p,exp_label,exp_label_len);
sl@0: 		p+=exp_label_len;
sl@0: 		memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
sl@0: 		p+=SSL3_RANDOM_SIZE;
sl@0: 		memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
sl@0: 		p+=SSL3_RANDOM_SIZE;
sl@0: 		tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
sl@0: 			 tmp1,tmp2,EVP_CIPHER_key_length(c));
sl@0: 		key=tmp1;
sl@0: 
sl@0: 		if (k > 0)
sl@0: 			{
sl@0: 			p=buf;
sl@0: 			memcpy(p,TLS_MD_IV_BLOCK_CONST,
sl@0: 				TLS_MD_IV_BLOCK_CONST_SIZE);
sl@0: 			p+=TLS_MD_IV_BLOCK_CONST_SIZE;
sl@0: 			memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
sl@0: 			p+=SSL3_RANDOM_SIZE;
sl@0: 			memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
sl@0: 			p+=SSL3_RANDOM_SIZE;
sl@0: 			tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
sl@0: 				 iv1,iv2,k*2);
sl@0: 			if (client_write)
sl@0: 				iv=iv1;
sl@0: 			else
sl@0: 				iv= &(iv1[k]);
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	s->session->key_arg_length=0;
sl@0: #ifdef KSSL_DEBUG
sl@0: 	{
sl@0:         int i;
sl@0: 	printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
sl@0: 	printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
sl@0: 	printf("\n");
sl@0: 	printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
sl@0: 	printf("\n");
sl@0: 	}
sl@0: #endif	/* KSSL_DEBUG */
sl@0: 
sl@0: 	EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
sl@0: #ifdef TLS_DEBUG
sl@0: printf("which = %04X\nkey=",which);
sl@0: { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
sl@0: printf("\niv=");
sl@0: { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
sl@0: printf("\n");
sl@0: #endif
sl@0: 
sl@0: 	OPENSSL_cleanse(tmp1,sizeof(tmp1));
sl@0: 	OPENSSL_cleanse(tmp2,sizeof(tmp1));
sl@0: 	OPENSSL_cleanse(iv1,sizeof(iv1));
sl@0: 	OPENSSL_cleanse(iv2,sizeof(iv2));
sl@0: 	return(1);
sl@0: err:
sl@0: 	SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
sl@0: err2:
sl@0: 	return(0);
sl@0: 	}
sl@0: 
sl@0: int tls1_setup_key_block(SSL *s)
sl@0: 	{
sl@0: 	unsigned char *p1,*p2;
sl@0: 	const EVP_CIPHER *c;
sl@0: 	const EVP_MD *hash;
sl@0: 	int num;
sl@0: 	SSL_COMP *comp;
sl@0: 
sl@0: #ifdef KSSL_DEBUG
sl@0: 	printf ("tls1_setup_key_block()\n");
sl@0: #endif	/* KSSL_DEBUG */
sl@0: 
sl@0: 	if (s->s3->tmp.key_block_length != 0)
sl@0: 		return(1);
sl@0: 
sl@0: 	if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
sl@0: 		{
sl@0: 		SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
sl@0: 		return(0);
sl@0: 		}
sl@0: 
sl@0: 	s->s3->tmp.new_sym_enc=c;
sl@0: 	s->s3->tmp.new_hash=hash;
sl@0: 
sl@0: 	num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
sl@0: 	num*=2;
sl@0: 
sl@0: 	ssl3_cleanup_key_block(s);
sl@0: 
sl@0: 	if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
sl@0: 		goto err;
sl@0: 	if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
sl@0: 		goto err;
sl@0: 
sl@0: 	s->s3->tmp.key_block_length=num;
sl@0: 	s->s3->tmp.key_block=p1;
sl@0: 
sl@0: 
sl@0: #ifdef TLS_DEBUG
sl@0: printf("client random\n");
sl@0: { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
sl@0: printf("server random\n");
sl@0: { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
sl@0: printf("pre-master\n");
sl@0: { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
sl@0: #endif
sl@0: 	tls1_generate_key_block(s,p1,p2,num);
sl@0: 	OPENSSL_cleanse(p2,num);
sl@0: 	OPENSSL_free(p2);
sl@0: #ifdef TLS_DEBUG
sl@0: printf("\nkey block\n");
sl@0: { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
sl@0: #endif
sl@0: 
sl@0: 	if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
sl@0: 		{
sl@0: 		/* enable vulnerability countermeasure for CBC ciphers with
sl@0: 		 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
sl@0: 		 */
sl@0: 		s->s3->need_empty_fragments = 1;
sl@0: 
sl@0: 		if (s->session->cipher != NULL)
sl@0: 			{
sl@0: 			if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
sl@0: 				s->s3->need_empty_fragments = 0;
sl@0: 			
sl@0: #ifndef OPENSSL_NO_RC4
sl@0: 			if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
sl@0: 				s->s3->need_empty_fragments = 0;
sl@0: #endif
sl@0: 			}
sl@0: 		}
sl@0: 		
sl@0: 	return(1);
sl@0: err:
sl@0: 	SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
sl@0: 	return(0);
sl@0: 	}
sl@0: 
sl@0: int tls1_enc(SSL *s, int send)
sl@0: 	{
sl@0: 	SSL3_RECORD *rec;
sl@0: 	EVP_CIPHER_CTX *ds;
sl@0: 	unsigned long l;
sl@0: 	int bs,i,ii,j,k,n=0;
sl@0: 	const EVP_CIPHER *enc;
sl@0: 
sl@0: 	if (send)
sl@0: 		{
sl@0: 		if (s->write_hash != NULL)
sl@0: 			n=EVP_MD_size(s->write_hash);
sl@0: 		ds=s->enc_write_ctx;
sl@0: 		rec= &(s->s3->wrec);
sl@0: 		if (s->enc_write_ctx == NULL)
sl@0: 			enc=NULL;
sl@0: 		else
sl@0: 			enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		if (s->read_hash != NULL)
sl@0: 			n=EVP_MD_size(s->read_hash);
sl@0: 		ds=s->enc_read_ctx;
sl@0: 		rec= &(s->s3->rrec);
sl@0: 		if (s->enc_read_ctx == NULL)
sl@0: 			enc=NULL;
sl@0: 		else
sl@0: 			enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
sl@0: 		}
sl@0: 
sl@0: #ifdef KSSL_DEBUG
sl@0: 	printf("tls1_enc(%d)\n", send);
sl@0: #endif    /* KSSL_DEBUG */
sl@0: 
sl@0: 	if ((s->session == NULL) || (ds == NULL) ||
sl@0: 		(enc == NULL))
sl@0: 		{
sl@0: 		memmove(rec->data,rec->input,rec->length);
sl@0: 		rec->input=rec->data;
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		l=rec->length;
sl@0: 		bs=EVP_CIPHER_block_size(ds->cipher);
sl@0: 
sl@0: 		if ((bs != 1) && send)
sl@0: 			{
sl@0: 			i=bs-((int)l%bs);
sl@0: 
sl@0: 			/* Add weird padding of upto 256 bytes */
sl@0: 
sl@0: 			/* we need to add 'i' padding bytes of value j */
sl@0: 			j=i-1;
sl@0: 			if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
sl@0: 				{
sl@0: 				if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
sl@0: 					j++;
sl@0: 				}
sl@0: 			for (k=(int)l; k<(int)(l+i); k++)
sl@0: 				rec->input[k]=j;
sl@0: 			l+=i;
sl@0: 			rec->length+=i;
sl@0: 			}
sl@0: 
sl@0: #ifdef KSSL_DEBUG
sl@0: 		{
sl@0:                 unsigned long ui;
sl@0: 		printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
sl@0:                         ds,rec->data,rec->input,l);
sl@0: 		printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
sl@0:                         ds->buf_len, ds->cipher->key_len,
sl@0:                         DES_KEY_SZ, DES_SCHEDULE_SZ,
sl@0:                         ds->cipher->iv_len);
sl@0: 		printf("\t\tIV: ");
sl@0: 		for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
sl@0: 		printf("\n");
sl@0: 		printf("\trec->input=");
sl@0: 		for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
sl@0: 		printf("\n");
sl@0: 		}
sl@0: #endif	/* KSSL_DEBUG */
sl@0: 
sl@0: 		if (!send)
sl@0: 			{
sl@0: 			if (l == 0 || l%bs != 0)
sl@0: 				{
sl@0: 				SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
sl@0: 				ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
sl@0: 				return 0;
sl@0: 				}
sl@0: 			}
sl@0: 		
sl@0: 		EVP_Cipher(ds,rec->data,rec->input,l);
sl@0: 
sl@0: #ifdef KSSL_DEBUG
sl@0: 		{
sl@0:                 unsigned long i;
sl@0:                 printf("\trec->data=");
sl@0: 		for (i=0; i<l; i++)
sl@0:                         printf(" %02x", rec->data[i]);  printf("\n");
sl@0:                 }
sl@0: #endif	/* KSSL_DEBUG */
sl@0: 
sl@0: 		if ((bs != 1) && !send)
sl@0: 			{
sl@0: 			ii=i=rec->data[l-1]; /* padding_length */
sl@0: 			i++;
sl@0: 			/* NB: if compression is in operation the first packet
sl@0: 			 * may not be of even length so the padding bug check
sl@0: 			 * cannot be performed. This bug workaround has been
sl@0: 			 * around since SSLeay so hopefully it is either fixed
sl@0: 			 * now or no buggy implementation supports compression 
sl@0: 			 * [steve]
sl@0: 			 */
sl@0: 			if ( (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
sl@0: 				&& !s->expand)
sl@0: 				{
sl@0: 				/* First packet is even in size, so check */
sl@0: 				if ((memcmp(s->s3->read_sequence,
sl@0: 					"\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
sl@0: 					s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
sl@0: 				if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
sl@0: 					i--;
sl@0: 				}
sl@0: 			/* TLS 1.0 does not bound the number of padding bytes by the block size.
sl@0: 			 * All of them must have value 'padding_length'. */
sl@0: 			if (i > (int)rec->length)
sl@0: 				{
sl@0: 				/* Incorrect padding. SSLerr() and ssl3_alert are done
sl@0: 				 * by caller: we don't want to reveal whether this is
sl@0: 				 * a decryption error or a MAC verification failure
sl@0: 				 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
sl@0: 				return -1;
sl@0: 				}
sl@0: 			for (j=(int)(l-i); j<(int)l; j++)
sl@0: 				{
sl@0: 				if (rec->data[j] != ii)
sl@0: 					{
sl@0: 					/* Incorrect padding */
sl@0: 					return -1;
sl@0: 					}
sl@0: 				}
sl@0: 			rec->length-=i;
sl@0: 			}
sl@0: 		}
sl@0: 	return(1);
sl@0: 	}
sl@0: 
sl@0: int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
sl@0: 	{
sl@0: 	unsigned int ret;
sl@0: 	EVP_MD_CTX ctx;
sl@0: 
sl@0: 	EVP_MD_CTX_init(&ctx);
sl@0: 	EVP_MD_CTX_copy_ex(&ctx,in_ctx);
sl@0: 	EVP_DigestFinal_ex(&ctx,out,&ret);
sl@0: 	EVP_MD_CTX_cleanup(&ctx);
sl@0: 	return((int)ret);
sl@0: 	}
sl@0: 
sl@0: int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
sl@0: 	     const char *str, int slen, unsigned char *out)
sl@0: 	{
sl@0: 	unsigned int i;
sl@0: 	EVP_MD_CTX ctx;
sl@0: 	unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
sl@0: 	unsigned char *q,buf2[12];
sl@0: 
sl@0: 	q=buf;
sl@0: 	memcpy(q,str,slen);
sl@0: 	q+=slen;
sl@0: 
sl@0: 	EVP_MD_CTX_init(&ctx);
sl@0: 	EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
sl@0: 	EVP_DigestFinal_ex(&ctx,q,&i);
sl@0: 	q+=i;
sl@0: 	EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
sl@0: 	EVP_DigestFinal_ex(&ctx,q,&i);
sl@0: 	q+=i;
sl@0: 
sl@0: 	tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
sl@0: 		s->session->master_key,s->session->master_key_length,
sl@0: 		out,buf2,sizeof buf2);
sl@0: 	EVP_MD_CTX_cleanup(&ctx);
sl@0: 
sl@0: 	return sizeof buf2;
sl@0: 	}
sl@0: 
sl@0: int tls1_mac(SSL *ssl, unsigned char *md, int send)
sl@0: 	{
sl@0: 	SSL3_RECORD *rec;
sl@0: 	unsigned char *mac_sec,*seq;
sl@0: 	const EVP_MD *hash;
sl@0: 	unsigned int md_size;
sl@0: 	int i;
sl@0: 	HMAC_CTX hmac;
sl@0: 	unsigned char buf[5]; 
sl@0: 
sl@0: 	if (send)
sl@0: 		{
sl@0: 		rec= &(ssl->s3->wrec);
sl@0: 		mac_sec= &(ssl->s3->write_mac_secret[0]);
sl@0: 		seq= &(ssl->s3->write_sequence[0]);
sl@0: 		hash=ssl->write_hash;
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		rec= &(ssl->s3->rrec);
sl@0: 		mac_sec= &(ssl->s3->read_mac_secret[0]);
sl@0: 		seq= &(ssl->s3->read_sequence[0]);
sl@0: 		hash=ssl->read_hash;
sl@0: 		}
sl@0: 
sl@0: 	md_size=EVP_MD_size(hash);
sl@0: 
sl@0: 	buf[0]=rec->type;
sl@0: 	if (ssl->version == DTLS1_VERSION && ssl->client_version == DTLS1_BAD_VER)
sl@0: 		{
sl@0: 	buf[1]=TLS1_VERSION_MAJOR;
sl@0: 	buf[2]=TLS1_VERSION_MINOR;
sl@0: 		}
sl@0: 	else	{
sl@0: 		buf[1]=(unsigned char)(ssl->version>>8);
sl@0: 		buf[2]=(unsigned char)(ssl->version);
sl@0: 		}
sl@0: 
sl@0: 	buf[3]=rec->length>>8;
sl@0: 	buf[4]=rec->length&0xff;
sl@0: 
sl@0: 	/* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
sl@0: 	HMAC_CTX_init(&hmac);
sl@0: 	HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);
sl@0: 
sl@0: 	if (ssl->version == DTLS1_VERSION && ssl->client_version != DTLS1_BAD_VER)
sl@0: 		{
sl@0: 		unsigned char dtlsseq[8],*p=dtlsseq;
sl@0: 
sl@0: 		s2n(send?ssl->d1->w_epoch:ssl->d1->r_epoch, p);
sl@0: 		memcpy (p,&seq[2],6);
sl@0: 
sl@0: 		HMAC_Update(&hmac,dtlsseq,8);
sl@0: 		}
sl@0: 	else
sl@0: 		HMAC_Update(&hmac,seq,8);
sl@0: 
sl@0: 	HMAC_Update(&hmac,buf,5);
sl@0: 	HMAC_Update(&hmac,rec->input,rec->length);
sl@0: 	HMAC_Final(&hmac,md,&md_size);
sl@0: 	HMAC_CTX_cleanup(&hmac);
sl@0: 
sl@0: #ifdef TLS_DEBUG
sl@0: printf("sec=");
sl@0: {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
sl@0: printf("seq=");
sl@0: {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
sl@0: printf("buf=");
sl@0: {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
sl@0: printf("rec=");
sl@0: {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
sl@0: #endif
sl@0: 
sl@0: 	if ( SSL_version(ssl) != DTLS1_VERSION)
sl@0: 		{
sl@0: 		for (i=7; i>=0; i--)
sl@0: 			{
sl@0: 			++seq[i];
sl@0: 			if (seq[i] != 0) break; 
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: #ifdef TLS_DEBUG
sl@0: {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
sl@0: #endif
sl@0: 	return(md_size);
sl@0: 	}
sl@0: 
sl@0: int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
sl@0: 	     int len)
sl@0: 	{
sl@0: 	unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
sl@0: 	unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
sl@0: 
sl@0: #ifdef KSSL_DEBUG
sl@0: 	printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
sl@0: #endif	/* KSSL_DEBUG */
sl@0: 
sl@0: 	/* Setup the stuff to munge */
sl@0: 	memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
sl@0: 		TLS_MD_MASTER_SECRET_CONST_SIZE);
sl@0: 	memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
sl@0: 		s->s3->client_random,SSL3_RANDOM_SIZE);
sl@0: 	memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
sl@0: 		s->s3->server_random,SSL3_RANDOM_SIZE);
sl@0: 	tls1_PRF(s->ctx->md5,s->ctx->sha1,
sl@0: 		buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
sl@0: 		s->session->master_key,buff,sizeof buff);
sl@0: #ifdef KSSL_DEBUG
sl@0: 	printf ("tls1_generate_master_secret() complete\n");
sl@0: #endif	/* KSSL_DEBUG */
sl@0: 	return(SSL3_MASTER_SECRET_SIZE);
sl@0: 	}
sl@0: 
sl@0: int tls1_alert_code(int code)
sl@0: 	{
sl@0: 	switch (code)
sl@0: 		{
sl@0: 	case SSL_AD_CLOSE_NOTIFY:	return(SSL3_AD_CLOSE_NOTIFY);
sl@0: 	case SSL_AD_UNEXPECTED_MESSAGE:	return(SSL3_AD_UNEXPECTED_MESSAGE);
sl@0: 	case SSL_AD_BAD_RECORD_MAC:	return(SSL3_AD_BAD_RECORD_MAC);
sl@0: 	case SSL_AD_DECRYPTION_FAILED:	return(TLS1_AD_DECRYPTION_FAILED);
sl@0: 	case SSL_AD_RECORD_OVERFLOW:	return(TLS1_AD_RECORD_OVERFLOW);
sl@0: 	case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
sl@0: 	case SSL_AD_HANDSHAKE_FAILURE:	return(SSL3_AD_HANDSHAKE_FAILURE);
sl@0: 	case SSL_AD_NO_CERTIFICATE:	return(-1);
sl@0: 	case SSL_AD_BAD_CERTIFICATE:	return(SSL3_AD_BAD_CERTIFICATE);
sl@0: 	case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
sl@0: 	case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
sl@0: 	case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
sl@0: 	case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
sl@0: 	case SSL_AD_ILLEGAL_PARAMETER:	return(SSL3_AD_ILLEGAL_PARAMETER);
sl@0: 	case SSL_AD_UNKNOWN_CA:		return(TLS1_AD_UNKNOWN_CA);
sl@0: 	case SSL_AD_ACCESS_DENIED:	return(TLS1_AD_ACCESS_DENIED);
sl@0: 	case SSL_AD_DECODE_ERROR:	return(TLS1_AD_DECODE_ERROR);
sl@0: 	case SSL_AD_DECRYPT_ERROR:	return(TLS1_AD_DECRYPT_ERROR);
sl@0: 	case SSL_AD_EXPORT_RESTRICTION:	return(TLS1_AD_EXPORT_RESTRICTION);
sl@0: 	case SSL_AD_PROTOCOL_VERSION:	return(TLS1_AD_PROTOCOL_VERSION);
sl@0: 	case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
sl@0: 	case SSL_AD_INTERNAL_ERROR:	return(TLS1_AD_INTERNAL_ERROR);
sl@0: 	case SSL_AD_USER_CANCELLED:	return(TLS1_AD_USER_CANCELLED);
sl@0: 	case SSL_AD_NO_RENEGOTIATION:	return(TLS1_AD_NO_RENEGOTIATION);
sl@0: 	case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return 
sl@0: 					  (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
sl@0: 	default:			return(-1);
sl@0: 		}
sl@0: 	}
sl@0: