CSE2410 Fall 2014 Bounce

/* 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) 1998-2007 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"

#ifndef OPENSSL_NO_COMP

#include <openssl/comp.h>

#endif

#include <openssl/evp.h>

#include <openssl/hmac.h>

#include <openssl/md5.h>

#include <openssl/rand.h>

#ifdef KSSL_DEBUG

#include <openssl/des.h>

#endif

/* seed1 through seed5 are virtually concatenated */

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

                        int sec_len,

                        const void *seed1, int seed1_len,

                        const void *seed2, int seed2_len,

                        const void *seed3, int seed3_len,

                        const void *seed4, int seed4_len,

                        const void *seed5, int seed5_len,

                        unsigned char *out, int olen)

        {

        int chunk;

        size_t j;

        EVP_MD_CTX ctx, ctx_tmp;

        EVP_PKEY *mac_key;

        unsigned char A1[EVP_MAX_MD_SIZE];

        size_t A1_len;

        int ret = 0;

        chunk=EVP_MD_size(md);

        OPENSSL_assert(chunk >= 0);

        EVP_MD_CTX_init(&ctx);

        EVP_MD_CTX_init(&ctx_tmp);

        EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);

        EVP_MD_CTX_set_flags(&ctx_tmp, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);

        mac_key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, sec, sec_len);

        if (!mac_key)

                goto err;

        if (!EVP_DigestSignInit(&ctx,NULL,md, NULL, mac_key))

                goto err;

        if (!EVP_DigestSignInit(&ctx_tmp,NULL,md, NULL, mac_key))

                goto err;

        if (seed1 && !EVP_DigestSignUpdate(&ctx,seed1,seed1_len))

                goto err;

        if (seed2 && !EVP_DigestSignUpdate(&ctx,seed2,seed2_len))

                goto err;

        if (seed3 && !EVP_DigestSignUpdate(&ctx,seed3,seed3_len))

                goto err;

        if (seed4 && !EVP_DigestSignUpdate(&ctx,seed4,seed4_len))

                goto err;

        if (seed5 && !EVP_DigestSignUpdate(&ctx,seed5,seed5_len))

                goto err;

        if (!EVP_DigestSignFinal(&ctx,A1,&A1_len))

                goto err;

        for (;;)

                {

                /* Reinit mac contexts */

                if (!EVP_DigestSignInit(&ctx,NULL,md, NULL, mac_key))

                        goto err;

                if (!EVP_DigestSignInit(&ctx_tmp,NULL,md, NULL, mac_key))

                        goto err;

                if (!EVP_DigestSignUpdate(&ctx,A1,A1_len))

                        goto err;

                if (!EVP_DigestSignUpdate(&ctx_tmp,A1,A1_len))

                        goto err;

                if (seed1 && !EVP_DigestSignUpdate(&ctx,seed1,seed1_len))

                        goto err;

                if (seed2 && !EVP_DigestSignUpdate(&ctx,seed2,seed2_len))

                        goto err;

                if (seed3 && !EVP_DigestSignUpdate(&ctx,seed3,seed3_len))

                        goto err;

                if (seed4 && !EVP_DigestSignUpdate(&ctx,seed4,seed4_len))

                        goto err;

                if (seed5 && !EVP_DigestSignUpdate(&ctx,seed5,seed5_len))

                        goto err;

                if (olen > chunk)

                        {

                        if (!EVP_DigestSignFinal(&ctx,out,&j))

                                goto err;

                        out+=j;

                        olen-=j;

                        /* calc the next A1 value */

                        if (!EVP_DigestSignFinal(&ctx_tmp,A1,&A1_len))

                                goto err;

                        }

                else        /* last one */

                        {

                        if (!EVP_DigestSignFinal(&ctx,A1,&A1_len))

                                goto err;

                        memcpy(out,A1,olen);

                        break;

                        }

                }

        ret = 1;

err:

        EVP_PKEY_free(mac_key);

        EVP_MD_CTX_cleanup(&ctx);

        EVP_MD_CTX_cleanup(&ctx_tmp);

        OPENSSL_cleanse(A1,sizeof(A1));

        return ret;

        }

/* seed1 through seed5 are virtually concatenated */

static int tls1_PRF(long digest_mask,

                     const void *seed1, int seed1_len,

                     const void *seed2, int seed2_len,

                     const void *seed3, int seed3_len,

                     const void *seed4, int seed4_len,

                     const void *seed5, int seed5_len,

                     const unsigned char *sec, int slen,

                     unsigned char *out1,

                     unsigned char *out2, int olen)

        {

        int len,i,idx,count;

        const unsigned char *S1;

        long m;

        const EVP_MD *md;

        int ret = 0;

        /* Count number of digests and partition sec evenly */

        count=0;

        for (idx=0;ssl_get_handshake_digest(idx,&m,&md);idx++) {

                if ((m<<TLS1_PRF_DGST_SHIFT) & digest_mask) count++;

        }        

        len=slen/count;

        if (count == 1)

                slen = 0;

        S1=sec;

        memset(out1,0,olen);

        for (idx=0;ssl_get_handshake_digest(idx,&m,&md);idx++) {

                if ((m<<TLS1_PRF_DGST_SHIFT) & digest_mask) {

                        if (!md) {

                                SSLerr(SSL_F_TLS1_PRF,

                                SSL_R_UNSUPPORTED_DIGEST_TYPE);

                                goto err;                                

                        }

                        if (!tls1_P_hash(md ,S1,len+(slen&1),

                                        seed1,seed1_len,seed2,seed2_len,seed3,seed3_len,seed4,seed4_len,seed5,seed5_len,

                                        out2,olen))

                                goto err;

                        S1+=len;

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

                        {

                                out1[i]^=out2[i];

                        }

                }

        }

        ret = 1;

err:

        return ret;

}

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

             unsigned char *tmp, int num)

        {

        int ret;

        ret = tls1_PRF(ssl_get_algorithm2(s),

                 TLS_MD_KEY_EXPANSION_CONST,TLS_MD_KEY_EXPANSION_CONST_SIZE,

                 s->s3->server_random,SSL3_RANDOM_SIZE,

                 s->s3->client_random,SSL3_RANDOM_SIZE,

                 NULL,0,NULL,0,

                 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 */

        return ret;

        }

int tls1_change_cipher_state(SSL *s, int which)

        {

        static const unsigned char empty[]="";

        unsigned char *p,*mac_secret;

        unsigned char *exp_label;

        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;

        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 mac_type;

        int *mac_secret_size;

        EVP_MD_CTX *mac_ctx;

        EVP_PKEY *mac_key;

        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;

        mac_type = s->s3->tmp.new_mac_pkey_type;

#ifndef OPENSSL_NO_COMP

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

#endif

#ifdef KSSL_DEBUG

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

        printf("\talg= %ld/%ld, comp= %p\n",

               s->s3->tmp.new_cipher->algorithm_mkey,

               s->s3->tmp.new_cipher->algorithm_auth,

               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", s->s3->tmp.key_block[i]);  printf("\n");

        }

#endif        /* KSSL_DEBUG */

        if (which & SSL3_CC_READ)

                {

                if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)

                        s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;

                else

                        s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;

                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;

                mac_ctx=ssl_replace_hash(&s->read_hash,NULL);

#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]);

                mac_secret_size=&(s->s3->read_mac_secret_size);

                }

        else

                {

                if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)

                        s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;

                        else

                        s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;

                if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s))

                        reuse_dd = 1;

                else if ((s->enc_write_ctx=EVP_CIPHER_CTX_new()) == NULL)

                        goto err;

                dd= s->enc_write_ctx;

                if (SSL_IS_DTLS(s))

                        {

                        mac_ctx = EVP_MD_CTX_create();

                        if (!mac_ctx)

                                goto err;

                        s->write_hash = mac_ctx;

                        }

                else

                        mac_ctx = ssl_replace_hash(&s->write_hash,NULL);

#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]);

                mac_secret_size = &(s->s3->write_mac_secret_size);

                }

        if (reuse_dd)

                EVP_CIPHER_CTX_cleanup(dd);

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

        i=*mac_secret_size=s->s3->tmp.new_mac_secret_size;

        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); */

        /* If GCM mode only part of IV comes from PRF */

        if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)

                k = EVP_GCM_TLS_FIXED_IV_LEN;

        else

                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;

                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);

        if (!(EVP_CIPHER_flags(c)&EVP_CIPH_FLAG_AEAD_CIPHER))

                {

                mac_key = EVP_PKEY_new_mac_key(mac_type, NULL,

                                mac_secret,*mac_secret_size);

                EVP_DigestSignInit(mac_ctx,NULL,m,NULL,mac_key);

                EVP_PKEY_free(mac_key);

                }

#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 :-).

                 */

                if (!tls1_PRF(ssl_get_algorithm2(s),

                                exp_label,exp_label_len,

                                s->s3->client_random,SSL3_RANDOM_SIZE,

                                s->s3->server_random,SSL3_RANDOM_SIZE,

                                NULL,0,NULL,0,

                                key,j,tmp1,tmp2,EVP_CIPHER_key_length(c)))

                        goto err2;

                key=tmp1;

                if (k > 0)

                        {

                        if (!tls1_PRF(ssl_get_algorithm2(s),

                                        TLS_MD_IV_BLOCK_CONST,TLS_MD_IV_BLOCK_CONST_SIZE,

                                        s->s3->client_random,SSL3_RANDOM_SIZE,

                                        s->s3->server_random,SSL3_RANDOM_SIZE,

                                        NULL,0,NULL,0,

                                        empty,0,iv1,iv2,k*2))

                                goto err2;

                        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 */

        if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)

                {

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

                EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, k, iv);

                }

        else        

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

        /* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */

        if ((EVP_CIPHER_flags(c)&EVP_CIPH_FLAG_AEAD_CIPHER) && *mac_secret_size)

                EVP_CIPHER_CTX_ctrl(dd,EVP_CTRL_AEAD_SET_MAC_KEY,

                                *mac_secret_size,mac_secret);

#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=NULL;

        const EVP_CIPHER *c;

        const EVP_MD *hash;

        int num;

        SSL_COMP *comp;

        int mac_type= NID_undef,mac_secret_size=0;

        int ret=0;

#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,&mac_type,&mac_secret_size,&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;

        s->s3->tmp.new_mac_pkey_type = mac_type;

        s->s3->tmp.new_mac_secret_size = mac_secret_size;

        num=EVP_CIPHER_key_length(c)+mac_secret_size+EVP_CIPHER_iv_length(c);

        num*=2;

        ssl3_cleanup_key_block(s);

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

                {

                SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);

                goto err;

                }

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

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

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

                {

                SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);

                goto err;

                }

#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

        if (!tls1_generate_key_block(s,p1,p2,num))

                goto err;

#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)

                && s->method->version <= TLS1_VERSION)

                {

                /* 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

                        }

                }

        ret = 1;

err:

        if (p2)

                {

                OPENSSL_cleanse(p2,num);

                OPENSSL_free(p2);

                }

        return(ret);

        }

/* tls1_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/AEAD-authenticator is invalid or, if sending,

 *       an internal error occured.

 */

int tls1_enc(SSL *s, int send)

        {

        SSL3_RECORD *rec;

        EVP_CIPHER_CTX *ds;

        unsigned long l;

        int bs,i,j,k,pad=0,ret,mac_size=0;

        const EVP_CIPHER *enc;

        if (send)

                {

                if (EVP_MD_CTX_md(s->write_hash))

                        {

                        int n=EVP_MD_CTX_size(s->write_hash);

                        OPENSSL_assert(n >= 0);

                        }

                ds=s->enc_write_ctx;

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

                if (s->enc_write_ctx == NULL)

                        enc=NULL;

                else

                        {

                        int ivlen;

                        enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);

                        /* For TLSv1.1 and later explicit IV */

                        if (s->version >= TLS1_1_VERSION

                                && EVP_CIPHER_mode(enc) == EVP_CIPH_CBC_MODE)

                                ivlen = EVP_CIPHER_iv_length(enc);

                        else

                                ivlen = 0;

                        if (ivlen > 1)

                                {

                                if ( rec->data != rec->input)

                                        /* we can't write into the input stream:

                                         * Can this ever happen?? (steve)

                                         */

                                        fprintf(stderr,

                                                "%s:%d: rec->data != rec->input\n",

                                                __FILE__, __LINE__);

                                else if (RAND_bytes(rec->input, ivlen) <= 0)

                                        return -1;

                                }

                        }

                }

        else

                {

                if (EVP_MD_CTX_md(s->read_hash))

                        {

                        int n=EVP_MD_CTX_size(s->read_hash);

                        OPENSSL_assert(n >= 0);

                        }

                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;

                ret = 1;

                }

        else

                {

                l=rec->length;

                bs=EVP_CIPHER_block_size(ds->cipher);

                if (EVP_CIPHER_flags(ds->cipher)&EVP_CIPH_FLAG_AEAD_CIPHER)

                        {

                        unsigned char buf[13],*seq;

                        seq = send?s->s3->write_sequence:s->s3->read_sequence;

                        if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)

                                {

                                unsigned char dtlsseq[9],*p=dtlsseq;

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

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

                                memcpy(buf,dtlsseq,8);

                                }

                        else

                                {

                                memcpy(buf,seq,8);

                                for (i=7; i>=0; i--)        /* increment */

                                        {

                                        ++seq[i];

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

                                        }

                                }

                        buf[8]=rec->type;

                        buf[9]=(unsigned char)(s->version>>8);

                        buf[10]=(unsigned char)(s->version);

                        buf[11]=rec->length>>8;

                        buf[12]=rec->length&0xff;

                        pad=EVP_CIPHER_CTX_ctrl(ds,EVP_CTRL_AEAD_TLS1_AAD,13,buf);

                        if (send)

                                {

                                l+=pad;

                                rec->length+=pad;

                                }

                        }

                else 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)

                                return 0;

                        }

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

                if ((EVP_CIPHER_flags(ds->cipher)&EVP_CIPH_FLAG_CUSTOM_CIPHER)

                                                ?(i<0)

                                                :(i==0))

                        return -1;        /* AEAD can fail to verify MAC */

                if (EVP_CIPHER_mode(enc) == EVP_CIPH_GCM_MODE && !send)

                        {

                        rec->data += EVP_GCM_TLS_EXPLICIT_IV_LEN;

                        rec->input += EVP_GCM_TLS_EXPLICIT_IV_LEN;

                        rec->length -= EVP_GCM_TLS_EXPLICIT_IV_LEN;

                        }

#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 */

                ret = 1;

                if (EVP_MD_CTX_md(s->read_hash) != NULL)

                        mac_size = EVP_MD_CTX_size(s->read_hash);

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

                        ret = tls1_cbc_remove_padding(s, rec, bs, mac_size);

                if (pad && !send)

                        rec->length -= pad;

                }

        return ret;

        }

int tls1_cert_verify_mac(SSL *s, int md_nid, unsigned char *out)

        {

        unsigned int ret;

        EVP_MD_CTX ctx, *d=NULL;

        int i;

        if (s->s3->handshake_buffer) 

                if (!ssl3_digest_cached_records(s))

                        return 0;

        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_TLS1_CERT_VERIFY_MAC,SSL_R_NO_REQUIRED_DIGEST);

                return 0;

        }        

        EVP_MD_CTX_init(&ctx);

        EVP_MD_CTX_copy_ex(&ctx,d);

        EVP_DigestFinal_ex(&ctx,out,&ret);

        EVP_MD_CTX_cleanup(&ctx);

        return((int)ret);

        }

int tls1_final_finish_mac(SSL *s,

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

        {

        unsigned int i;

        EVP_MD_CTX ctx;

        unsigned char buf[2*EVP_MAX_MD_SIZE];

        unsigned char *q,buf2[12];

        int idx;

        long mask;

        int err=0;

        const EVP_MD *md; 

        q=buf;

        if (s->s3->handshake_buffer) 

                if (!ssl3_digest_cached_records(s))

                        return 0;

        EVP_MD_CTX_init(&ctx);

        for (idx=0;ssl_get_handshake_digest(idx,&mask,&md);idx++)

                {

                if (mask & ssl_get_algorithm2(s))

                        {

                        int hashsize = EVP_MD_size(md);

                        EVP_MD_CTX *hdgst = s->s3->handshake_dgst[idx];

                        if (!hdgst || hashsize < 0 || hashsize > (int)(sizeof buf - (size_t)(q-buf)))

                                {

                                /* internal error: 'buf' is too small for this cipersuite! */

                                err = 1;

                                }

                        else

                                {

                                if (!EVP_MD_CTX_copy_ex(&ctx, hdgst) ||

                                        !EVP_DigestFinal_ex(&ctx,q,&i) ||

                                        (i != (unsigned int)hashsize))

                                        err = 1;

                                q+=hashsize;

                                }

                        }

                }

        if (!tls1_PRF(ssl_get_algorithm2(s),

                        str,slen, buf,(int)(q-buf), NULL,0, NULL,0, NULL,0,

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

                        out,buf2,sizeof buf2))

                err = 1;

        EVP_MD_CTX_cleanup(&ctx);

        if (err)

                return 0;

        else