/* ssl/s3_enc.c */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

/* ====================================================================

 * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 *

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in

 *    the documentation and/or other materials provided with the

 *    distribution.

 *

 * 3. All advertising materials mentioning features or use of this

 *    software must display the following acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    openssl-core@openssl.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR

 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

 * OF THE POSSIBILITY OF SUCH DAMAGE.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

/* ====================================================================

 * Copyright 2005 Nokia. All rights reserved.

 *

 * The portions of the attached software ("Contribution") is developed by

 * Nokia Corporation and is licensed pursuant to the OpenSSL open source

 * license.

 *

 * The Contribution, originally written by Mika Kousa and Pasi Eronen of

 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites

 * support (see RFC 4279) to OpenSSL.

 *

 * No patent licenses or other rights except those expressly stated in

 * the OpenSSL open source license shall be deemed granted or received

 * expressly, by implication, estoppel, or otherwise.

 *

 * No assurances are provided by Nokia that the Contribution does not

 * infringe the patent or other intellectual property rights of any third

 * party or that the license provides you with all the necessary rights

 * to make use of the Contribution.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN

 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA

 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY

 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR

 * OTHERWISE.

 */

#include <stdio.h>

#include "ssl_locl.h"

#include <openssl/evp.h>

#include <openssl/md5.h>

static unsigned char ssl3_pad_1[48] = {

    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,

    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,

    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,

    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,

    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,

    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36

};

static unsigned char ssl3_pad_2[48] = {

    0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,

    0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,

    0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,

    0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,

    0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,

    0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c

};

static int ssl3_handshake_mac(SSL *s, int md_nid,

                              const char *sender, int len, unsigned char *p);

static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)

{

    EVP_MD_CTX m5;

    EVP_MD_CTX s1;

    unsigned char buf[16], smd[SHA_DIGEST_LENGTH];

    unsigned char c = 'A';

    unsigned int i, j, k;

#ifdef CHARSET_EBCDIC

    c = os_toascii[c];          /* 'A' in ASCII */

#endif

    k = 0;

    EVP_MD_CTX_init(&m5);

    EVP_MD_CTX_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);

    EVP_MD_CTX_init(&s1);

    for (i = 0; (int)i < num; i += MD5_DIGEST_LENGTH) {

        k++;

        if (k > sizeof(buf))

            /* bug: 'buf' is too small for this ciphersuite */

            goto err;

        for (j = 0; j < k; j++)

            buf[j] = c;

        c++;

        if (!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))

            goto err2;

        if (!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))

            goto err2;

        if ((int)(i + MD5_DIGEST_LENGTH) > num) {

            if (!EVP_DigestFinal_ex(&m5, smd, NULL))

                goto err2;

            memcpy(km, smd, (num - i));

        } else

            if (!EVP_DigestFinal_ex(&m5, km, NULL))

                goto err2;

        km += MD5_DIGEST_LENGTH;

    }

    OPENSSL_cleanse(smd, SHA_DIGEST_LENGTH);

    EVP_MD_CTX_cleanup(&m5);

    EVP_MD_CTX_cleanup(&s1);

    return 1;

 err:

    SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);

 err2:

    EVP_MD_CTX_cleanup(&m5);

    EVP_MD_CTX_cleanup(&s1);

    return 0;

}

int ssl3_change_cipher_state(SSL *s, int which)

{

    unsigned char *p, *mac_secret;

    unsigned char exp_key[EVP_MAX_KEY_LENGTH];

    unsigned char exp_iv[EVP_MAX_IV_LENGTH];

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

    EVP_CIPHER_CTX *dd;

    const EVP_CIPHER *c;

#ifndef OPENSSL_NO_COMP

    COMP_METHOD *comp;

#endif

    const EVP_MD *m;

    EVP_MD_CTX md;

    int is_exp, n, i, j, k, cl;

    int reuse_dd = 0;

    is_exp = SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);

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

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

    /* m == NULL will lead to a crash later */

    OPENSSL_assert(m);

#ifndef OPENSSL_NO_COMP

    if (s->s3->tmp.new_compression == NULL)

        comp = NULL;

    else

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

#endif

    if (which & SSL3_CC_READ) {

        if (s->enc_read_ctx != NULL)

            reuse_dd = 1;

        else if ((s->enc_read_ctx =

                  OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)

            goto err;

        else

            /*

             * make sure it's intialized in case we exit later with an error

             */

            EVP_CIPHER_CTX_init(s->enc_read_ctx);

        dd = s->enc_read_ctx;

        if (ssl_replace_hash(&s->read_hash, m) == NULL) {

                SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);

                goto err2;

        }

#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;

        if (ssl_replace_hash(&s->write_hash, m) == NULL) {

                SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);

                goto err2;

        }

#ifndef OPENSSL_NO_COMP

        /* COMPRESS */

        if (s->compress != NULL) {

            COMP_CTX_free(s->compress);

            s->compress = NULL;

        }

        if (comp != NULL) {

            s->compress = COMP_CTX_new(comp);

            if (s->compress == NULL) {

                SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,

                       SSL_R_COMPRESSION_LIBRARY_ERROR);

                goto err2;

            }

        }

#endif

        memset(&(s->s3->write_sequence[0]), 0, 8);

        mac_secret = &(s->s3->write_mac_secret[0]);

    }

    if (reuse_dd)

        EVP_CIPHER_CTX_cleanup(dd);

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

    i = EVP_MD_size(m);

    if (i < 0)

        goto err2;

    cl = EVP_CIPHER_key_length(c);

    j = is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?

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

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

    k = EVP_CIPHER_iv_length(c);

    if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||

        (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {

        ms = &(p[0]);

        n = i + i;

        key = &(p[n]);

        n += j + j;

        iv = &(p[n]);

        n += k + k;

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

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

    } else {

        n = i;

        ms = &(p[n]);

        n += i + j;

        key = &(p[n]);

        n += j + k;

        iv = &(p[n]);

        n += k;

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

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

    }

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

        SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);

        goto err2;

    }

    EVP_MD_CTX_init(&md);

    memcpy(mac_secret, ms, i);

    if (is_exp) {

        /*

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

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

         */

        if (!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)) {

            EVP_MD_CTX_cleanup(&md);

            goto err2;

        }

        key = &(exp_key[0]);

        if (k > 0) {

            if (!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)) {

                EVP_MD_CTX_cleanup(&md);

                goto err2;

            }

            iv = &(exp_iv[0]);

        }

    }

    EVP_MD_CTX_cleanup(&md);

    s->session->key_arg_length = 0;

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

        goto err2;

#ifdef OPENSSL_SSL_TRACE_CRYPTO

    if (s->msg_callback) {

        int wh = which & SSL3_CC_WRITE ?

            TLS1_RT_CRYPTO_WRITE : TLS1_RT_CRYPTO_READ;

        s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_MAC,

                        mac_secret, EVP_MD_size(m), s, s->msg_callback_arg);

        if (c->key_len)

            s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,

                            key, c->key_len, s, s->msg_callback_arg);

        if (k) {

            s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_IV,

                            iv, k, s, s->msg_callback_arg);

        }

    }

#endif

    OPENSSL_cleanse(&(exp_key[0]), sizeof(exp_key));

    OPENSSL_cleanse(&(exp_iv[0]), sizeof(exp_iv));

    return (1);

 err:

    SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);

 err2:

    return (0);

}

int ssl3_setup_key_block(SSL *s)

{

    unsigned char *p;

    const EVP_CIPHER *c;

    const EVP_MD *hash;

    int num;

    int ret = 0;

    SSL_COMP *comp;

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

        return (1);

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

        SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);

        return (0);

    }

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

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

#ifdef OPENSSL_NO_COMP

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

#else

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

#endif

    num = EVP_MD_size(hash);

    if (num < 0)

        return 0;

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

    num *= 2;

    ssl3_cleanup_key_block(s);

    if ((p = OPENSSL_malloc(num)) == NULL)

        goto err;

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

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

    ret = ssl3_generate_key_block(s, p, num);

    if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) {

        /*

         * enable vulnerability countermeasure for CBC ciphers with known-IV

         * problem (http://www.openssl.org/~bodo/tls-cbc.txt)

         */

        s->s3->need_empty_fragments = 1;

        if (s->session->cipher != NULL) {

            if (s->session->cipher->algorithm_enc == SSL_eNULL)

                s->s3->need_empty_fragments = 0;

#ifndef OPENSSL_NO_RC4

            if (s->session->cipher->algorithm_enc == SSL_RC4)

                s->s3->need_empty_fragments = 0;

#endif

        }

    }

    return ret;

 err:

    SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, ERR_R_MALLOC_FAILURE);

    return (0);

}

void ssl3_cleanup_key_block(SSL *s)

{

    if (s->s3->tmp.key_block != NULL) {

        OPENSSL_cleanse(s->s3->tmp.key_block, s->s3->tmp.key_block_length);

        OPENSSL_free(s->s3->tmp.key_block);

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

    }

    s->s3->tmp.key_block_length = 0;

}

/*-

 * ssl3_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively.

 *

 * Returns:

 *   0: (in non-constant time) if the record is publically invalid (i.e. too

 *       short etc).

 *   1: if the record's padding is valid / the encryption was successful.

 *   -1: if the record's padding is invalid or, if sending, an internal error

 *       occured.

 */

int ssl3_enc(SSL *s, int send)

{

    SSL3_RECORD *rec;

    EVP_CIPHER_CTX *ds;

    unsigned long l;

    int bs, i, mac_size = 0;

    const EVP_CIPHER *enc;

    if (send) {

        ds = s->enc_write_ctx;

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

        if (s->enc_write_ctx == NULL)

            enc = NULL;

        else

            enc = EVP_CIPHER_CTX_cipher(s->enc_write_ctx);

    } else {

        ds = s->enc_read_ctx;

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

        if (s->enc_read_ctx == NULL)

            enc = NULL;

        else

            enc = EVP_CIPHER_CTX_cipher(s->enc_read_ctx);

    }

    if ((s->session == NULL) || (ds == NULL) || (enc == NULL)) {

        memmove(rec->data, rec->input, rec->length);

        rec->input = rec->data;

    } else {

        l = rec->length;

        bs = EVP_CIPHER_block_size(ds->cipher);

        /* COMPRESS */

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

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

            /* we need to add 'i-1' padding bytes */

            l += i;

            /*

             * the last of these zero bytes will be overwritten with the

             * padding length.

             */

            memset(&rec->input[rec->length], 0, i);

            rec->length += i;

            rec->input[l - 1] = (i - 1);

        }

        if (!send) {

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

                return 0;

            /* otherwise, rec->length >= bs */

        }

        if (EVP_Cipher(ds, rec->data, rec->input, l) < 1)

            return -1;

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

            mac_size = EVP_MD_CTX_size(s->read_hash);

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

            return ssl3_cbc_remove_padding(s, rec, bs, mac_size);

    }

    return 1;

}

int ssl3_init_finished_mac(SSL *s)

{

    if (s->s3->handshake_buffer)

        BIO_free(s->s3->handshake_buffer);

    if (s->s3->handshake_dgst)

        ssl3_free_digest_list(s);

    s->s3->handshake_buffer = BIO_new(BIO_s_mem());

    if (s->s3->handshake_buffer == NULL)

        return 0;

    (void)BIO_set_close(s->s3->handshake_buffer, BIO_CLOSE);

    return 1;

}

void ssl3_free_digest_list(SSL *s)

{

    int i;

    if (!s->s3->handshake_dgst)

        return;

    for (i = 0; i < SSL_MAX_DIGEST; i++) {

        if (s->s3->handshake_dgst[i])

            EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]);

    }

    OPENSSL_free(s->s3->handshake_dgst);

    s->s3->handshake_dgst = NULL;

}

void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)

{

    if (s->s3->handshake_buffer

        && !(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) {

        BIO_write(s->s3->handshake_buffer, (void *)buf, len);

    } else {

        int i;

        for (i = 0; i < SSL_MAX_DIGEST; i++) {

            if (s->s3->handshake_dgst[i] != NULL)

                EVP_DigestUpdate(s->s3->handshake_dgst[i], buf, len);

        }

    }

}

int ssl3_digest_cached_records(SSL *s)

{

    int i;

    long mask;

    const EVP_MD *md;

    long hdatalen;

    void *hdata;

    /* Allocate handshake_dgst array */

    ssl3_free_digest_list(s);

    s->s3->handshake_dgst =

        OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));

    if (s->s3->handshake_dgst == NULL) {

        SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_MALLOC_FAILURE);

        return 0;

    }

    memset(s->s3->handshake_dgst, 0, SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));

    hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);

    if (hdatalen <= 0) {

        SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);

        return 0;

    }

    /* Loop through bitso of algorithm2 field and create MD_CTX-es */

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

        if ((mask & ssl_get_algorithm2(s)) && md) {

            s->s3->handshake_dgst[i] = EVP_MD_CTX_create();

            if (s->s3->handshake_dgst[i] == NULL) {

                SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_MALLOC_FAILURE);

                return 0;

            }

#ifdef OPENSSL_FIPS

            if (EVP_MD_nid(md) == NID_md5) {

                EVP_MD_CTX_set_flags(s->s3->handshake_dgst[i],

                                     EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);

            }

#endif

            if (!EVP_DigestInit_ex(s->s3->handshake_dgst[i], md, NULL)

                || !EVP_DigestUpdate(s->s3->handshake_dgst[i], hdata,

                                     hdatalen)) {

                SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_INTERNAL_ERROR);

                return 0;

            }

        } else {

            s->s3->handshake_dgst[i] = NULL;

        }

    }

    if (!(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) {

        /* Free handshake_buffer BIO */

        BIO_free(s->s3->handshake_buffer);

        s->s3->handshake_buffer = NULL;

    }

    return 1;

}

int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p)

{

    return (ssl3_handshake_mac(s, md_nid, NULL, 0, p));

}

int ssl3_final_finish_mac(SSL *s,

                          const char *sender, int len, unsigned char *p)

{

    int ret, sha1len;

    ret = ssl3_handshake_mac(s, NID_md5, sender, len, p);

    if (ret == 0)

        return 0;

    p += ret;

    sha1len = ssl3_handshake_mac(s, NID_sha1, sender, len, p);

    if (sha1len == 0)

        return 0;

    ret += sha1len;

    return (ret);

}

static int ssl3_handshake_mac(SSL *s, int md_nid,

                              const char *sender, int len, unsigned char *p)

{

    unsigned int ret;

    int npad, n;

    unsigned int i;

    unsigned char md_buf[EVP_MAX_MD_SIZE];

    EVP_MD_CTX ctx, *d = NULL;

    if (s->s3->handshake_buffer)

        if (!ssl3_digest_cached_records(s))

            return 0;

    /*

     * Search for digest of specified type in the handshake_dgst array

     */

    for (i = 0; i < SSL_MAX_DIGEST; i++) {

        if (s->s3->handshake_dgst[i]

            && EVP_MD_CTX_type(s->s3->handshake_dgst[i]) == md_nid) {

            d = s->s3->handshake_dgst[i];

            break;

        }

    }

    if (!d) {

        SSLerr(SSL_F_SSL3_HANDSHAKE_MAC, SSL_R_NO_REQUIRED_DIGEST);

        return 0;

    }

    EVP_MD_CTX_init(&ctx);

    EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);

    EVP_MD_CTX_copy_ex(&ctx, d);

    n = EVP_MD_CTX_size(&ctx);

    if (n < 0)

        return 0;

    npad = (48 / n) * n;

    if ((sender != NULL && EVP_DigestUpdate(&ctx, sender, len) <= 0)

            || EVP_DigestUpdate(&ctx, s->session->master_key,

                                s->session->master_key_length) <= 0

            || EVP_DigestUpdate(&ctx, ssl3_pad_1, npad) <= 0

            || EVP_DigestFinal_ex(&ctx, md_buf, &i) <= 0

            || EVP_DigestInit_ex(&ctx, EVP_MD_CTX_md(&ctx), NULL) <= 0

            || EVP_DigestUpdate(&ctx, s->session->master_key,

                                s->session->master_key_length) <= 0

            || EVP_DigestUpdate(&ctx, ssl3_pad_2, npad) <= 0

            || EVP_DigestUpdate(&ctx, md_buf, i) <= 0

            || EVP_DigestFinal_ex(&ctx, p, &ret) <= 0) {

        SSLerr(SSL_F_SSL3_HANDSHAKE_MAC, ERR_R_INTERNAL_ERROR);

        ret = 0;

    }

    EVP_MD_CTX_cleanup(&ctx);

    return ((int)ret);

}

int n_ssl3_mac(SSL *ssl, unsigned char *md, int send)

{

    SSL3_RECORD *rec;

    unsigned char *mac_sec, *seq;

    EVP_MD_CTX md_ctx;

    const EVP_MD_CTX *hash;

    unsigned char *p, rec_char;

    size_t md_size, orig_len;

    int npad;

    int t;

    if (send) {

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

        mac_sec = &(ssl->s3->write_mac_secret[0]);

        seq = &(ssl->s3->write_sequence[0]);

        hash = ssl->write_hash;

    } else {

        rec = &(ssl->s3->rrec);

        mac_sec = &(ssl->s3->read_mac_secret[0]);

        seq = &(ssl->s3->read_sequence[0]);

        hash = ssl->read_hash;

    }

    t = EVP_MD_CTX_size(hash);

    if (t < 0)

        return -1;

    md_size = t;

    npad = (48 / md_size) * md_size;

    /*

     * kludge: ssl3_cbc_remove_padding passes padding length in rec->type

     */

    orig_len = rec->length + md_size + ((unsigned int)rec->type >> 8);

    rec->type &= 0xff;

    if (!send &&

        EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE &&

        ssl3_cbc_record_digest_supported(hash)) {

        /*

         * This is a CBC-encrypted record. We must avoid leaking any

         * timing-side channel information about how many blocks of data we

         * are hashing because that gives an attacker a timing-oracle.

         */

        /*-

         * npad is, at most, 48 bytes and that's with MD5:

         *   16 + 48 + 8 (sequence bytes) + 1 + 2 = 75.

         *

         * With SHA-1 (the largest hash speced for SSLv3) the hash size

         * goes up 4, but npad goes down by 8, resulting in a smaller

         * total size.

         */

        unsigned char header[75];

        unsigned j = 0;

        memcpy(header + j, mac_sec, md_size);

        j += md_size;

        memcpy(header + j, ssl3_pad_1, npad);

        j += npad;

        memcpy(header + j, seq, 8);

        j += 8;

        header[j++] = rec->type;

        header[j++] = rec->length >> 8;

        header[j++] = rec->length & 0xff;

        /* Final param == is SSLv3 */

        if (ssl3_cbc_digest_record(hash,

                                   md, &md_size,

                                   header, rec->input,

                                   rec->length + md_size, orig_len,

                                   mac_sec, md_size, 1) <= 0)

            return -1;

    } else {

        unsigned int md_size_u;

        /* Chop the digest off the end :-) */

        EVP_MD_CTX_init(&md_ctx);

        rec_char = rec->type;

        p = md;

        s2n(rec->length, p);

        if (EVP_MD_CTX_copy_ex(&md_ctx, hash) <= 0

                || EVP_DigestUpdate(&md_ctx, mac_sec, md_size) <= 0

                || EVP_DigestUpdate(&md_ctx, ssl3_pad_1, npad) <= 0

                || EVP_DigestUpdate(&md_ctx, seq, 8) <= 0

                || EVP_DigestUpdate(&md_ctx, &rec_char, 1) <= 0

                || EVP_DigestUpdate(&md_ctx, md, 2) <= 0

                || EVP_DigestUpdate(&md_ctx, rec->input, rec->length) <= 0

                || EVP_DigestFinal_ex(&md_ctx, md, NULL) <= 0

                || EVP_MD_CTX_copy_ex(&md_ctx, hash) <= 0

                || EVP_DigestUpdate(&md_ctx, mac_sec, md_size) <= 0

                || EVP_DigestUpdate(&md_ctx, ssl3_pad_2, npad) <= 0

                || EVP_DigestUpdate(&md_ctx, md, md_size) <= 0

                || EVP_DigestFinal_ex(&md_ctx, md, &md_size_u) <= 0) {

            EVP_MD_CTX_cleanup(&md_ctx);

            return -1;

        }

        md_size = md_size_u;

        EVP_MD_CTX_cleanup(&md_ctx);

    }

    ssl3_record_sequence_update(seq);

    return (md_size);

}

void ssl3_record_sequence_update(unsigned char *seq)

{

    int i;

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

        ++seq[i];

        if (seq[i] != 0)

            break;

    }

}

int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,

                                int len)

{

    static const unsigned char *salt[3] = {

#ifndef CHARSET_EBCDIC

        (const unsigned char *)"A",

        (const unsigned char *)"BB",

        (const unsigned char *)"CCC",

#else

        (const unsigned char *)"\x41",

        (const unsigned char *)"\x42\x42",

        (const unsigned char *)"\x43\x43\x43",

#endif

    };

    unsigned char buf[EVP_MAX_MD_SIZE];

    EVP_MD_CTX ctx;

    int i, ret = 0;

    unsigned int n;

#ifdef OPENSSL_SSL_TRACE_CRYPTO

    unsigned char *tmpout = out;

#endif

    EVP_MD_CTX_init(&ctx);

    for (i = 0; i < 3; i++) {

        if (EVP_DigestInit_ex(&ctx, s->ctx->sha1, NULL) <= 0

                || EVP_DigestUpdate(&ctx, salt[i],

                                    strlen((const char *)salt[i])) <= 0

                || EVP_DigestUpdate(&ctx, p, len) <= 0

                || EVP_DigestUpdate(&ctx, &(s->s3->client_random[0]),

                                    SSL3_RANDOM_SIZE) <= 0