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/* ssl/ssl3.h */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */
/* ====================================================================
 * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 * ECC cipher suite support in OpenSSL originally developed by
 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
 */

#ifndef HEADER_SSL3_H
# define HEADER_SSL3_H

# ifndef OPENSSL_NO_COMP
#  include <openssl/comp.h>
# endif
# include <openssl/buffer.h>
# include <openssl/evp.h>
# include <openssl/ssl.h>

#ifdef  __cplusplus
extern "C" {
#endif

/*
 * Signalling cipher suite value from RFC 5746
 * (TLS_EMPTY_RENEGOTIATION_INFO_SCSV)
 */
# define SSL3_CK_SCSV                            0x030000FF

/*
 * Signalling cipher suite value from draft-ietf-tls-downgrade-scsv-00
 * (TLS_FALLBACK_SCSV)
 */
# define SSL3_CK_FALLBACK_SCSV                   0x03005600

# define SSL3_CK_RSA_NULL_MD5                    0x03000001
# define SSL3_CK_RSA_NULL_SHA                    0x03000002
# define SSL3_CK_RSA_RC4_40_MD5                  0x03000003
# define SSL3_CK_RSA_RC4_128_MD5                 0x03000004
# define SSL3_CK_RSA_RC4_128_SHA                 0x03000005
# define SSL3_CK_RSA_RC2_40_MD5                  0x03000006
# define SSL3_CK_RSA_IDEA_128_SHA                0x03000007
# define SSL3_CK_RSA_DES_40_CBC_SHA              0x03000008
# define SSL3_CK_RSA_DES_64_CBC_SHA              0x03000009
# define SSL3_CK_RSA_DES_192_CBC3_SHA            0x0300000A

# define SSL3_CK_DH_DSS_DES_40_CBC_SHA           0x0300000B
# define SSL3_CK_DH_DSS_DES_64_CBC_SHA           0x0300000C
# define SSL3_CK_DH_DSS_DES_192_CBC3_SHA         0x0300000D
# define SSL3_CK_DH_RSA_DES_40_CBC_SHA           0x0300000E
# define SSL3_CK_DH_RSA_DES_64_CBC_SHA           0x0300000F
# define SSL3_CK_DH_RSA_DES_192_CBC3_SHA         0x03000010

# define SSL3_CK_EDH_DSS_DES_40_CBC_SHA          0x03000011
# define SSL3_CK_DHE_DSS_DES_40_CBC_SHA          SSL3_CK_EDH_DSS_DES_40_CBC_SHA
# define SSL3_CK_EDH_DSS_DES_64_CBC_SHA          0x03000012
# define SSL3_CK_DHE_DSS_DES_64_CBC_SHA          SSL3_CK_EDH_DSS_DES_64_CBC_SHA
# define SSL3_CK_EDH_DSS_DES_192_CBC3_SHA        0x03000013
# define SSL3_CK_DHE_DSS_DES_192_CBC3_SHA        SSL3_CK_EDH_DSS_DES_192_CBC3_SHA
# define SSL3_CK_EDH_RSA_DES_40_CBC_SHA          0x03000014
# define SSL3_CK_DHE_RSA_DES_40_CBC_SHA          SSL3_CK_EDH_RSA_DES_40_CBC_SHA
# define SSL3_CK_EDH_RSA_DES_64_CBC_SHA          0x03000015
# define SSL3_CK_DHE_RSA_DES_64_CBC_SHA          SSL3_CK_EDH_RSA_DES_64_CBC_SHA
# define SSL3_CK_EDH_RSA_DES_192_CBC3_SHA        0x03000016
# define SSL3_CK_DHE_RSA_DES_192_CBC3_SHA        SSL3_CK_EDH_RSA_DES_192_CBC3_SHA

# define SSL3_CK_ADH_RC4_40_MD5                  0x03000017
# define SSL3_CK_ADH_RC4_128_MD5                 0x03000018
# define SSL3_CK_ADH_DES_40_CBC_SHA              0x03000019
# define SSL3_CK_ADH_DES_64_CBC_SHA              0x0300001A
# define SSL3_CK_ADH_DES_192_CBC_SHA             0x0300001B

# if 0
#  define SSL3_CK_FZA_DMS_NULL_SHA                0x0300001C
#  define SSL3_CK_FZA_DMS_FZA_SHA                 0x0300001D
#  if 0                         /* Because it clashes with KRB5, is never
                                 * used any more, and is safe to remove
                                 * according to David Hopwood
                                 * <david.hopwood@zetnet.co.uk> of the
                                 * ietf-tls list */
#   define SSL3_CK_FZA_DMS_RC4_SHA                 0x0300001E
#  endif
# endif

/*
 * VRS Additional Kerberos5 entries
 */
# define SSL3_CK_KRB5_DES_64_CBC_SHA             0x0300001E
# define SSL3_CK_KRB5_DES_192_CBC3_SHA           0x0300001F
# define SSL3_CK_KRB5_RC4_128_SHA                0x03000020
# define SSL3_CK_KRB5_IDEA_128_CBC_SHA           0x03000021
# define SSL3_CK_KRB5_DES_64_CBC_MD5             0x03000022
# define SSL3_CK_KRB5_DES_192_CBC3_MD5           0x03000023
# define SSL3_CK_KRB5_RC4_128_MD5                0x03000024
# define SSL3_CK_KRB5_IDEA_128_CBC_MD5           0x03000025

# define SSL3_CK_KRB5_DES_40_CBC_SHA             0x03000026
# define SSL3_CK_KRB5_RC2_40_CBC_SHA             0x03000027
# define SSL3_CK_KRB5_RC4_40_SHA                 0x03000028
# define SSL3_CK_KRB5_DES_40_CBC_MD5             0x03000029
# define SSL3_CK_KRB5_RC2_40_CBC_MD5             0x0300002A
# define SSL3_CK_KRB5_RC4_40_MD5                 0x0300002B

# define SSL3_TXT_RSA_NULL_MD5                   "NULL-MD5"
# define SSL3_TXT_RSA_NULL_SHA                   "NULL-SHA"
# define SSL3_TXT_RSA_RC4_40_MD5                 "EXP-RC4-MD5"
# define SSL3_TXT_RSA_RC4_128_MD5                "RC4-MD5"
# define SSL3_TXT_RSA_RC4_128_SHA                "RC4-SHA"
# define SSL3_TXT_RSA_RC2_40_MD5                 "EXP-RC2-CBC-MD5"
# define SSL3_TXT_RSA_IDEA_128_SHA               "IDEA-CBC-SHA"
# define SSL3_TXT_RSA_DES_40_CBC_SHA             "EXP-DES-CBC-SHA"
# define SSL3_TXT_RSA_DES_64_CBC_SHA             "DES-CBC-SHA"
# define SSL3_TXT_RSA_DES_192_CBC3_SHA           "DES-CBC3-SHA"

# define SSL3_TXT_DH_DSS_DES_40_CBC_SHA          "EXP-DH-DSS-DES-CBC-SHA"
# define SSL3_TXT_DH_DSS_DES_64_CBC_SHA          "DH-DSS-DES-CBC-SHA"
# define SSL3_TXT_DH_DSS_DES_192_CBC3_SHA        "DH-DSS-DES-CBC3-SHA"
# define SSL3_TXT_DH_RSA_DES_40_CBC_SHA          "EXP-DH-RSA-DES-CBC-SHA"
# define SSL3_TXT_DH_RSA_DES_64_CBC_SHA          "DH-RSA-DES-CBC-SHA"
# define SSL3_TXT_DH_RSA_DES_192_CBC3_SHA        "DH-RSA-DES-CBC3-SHA"

# define SSL3_TXT_DHE_DSS_DES_40_CBC_SHA         "EXP-DHE-DSS-DES-CBC-SHA"
# define SSL3_TXT_DHE_DSS_DES_64_CBC_SHA         "DHE-DSS-DES-CBC-SHA"
# define SSL3_TXT_DHE_DSS_DES_192_CBC3_SHA       "DHE-DSS-DES-CBC3-SHA"
# define SSL3_TXT_DHE_RSA_DES_40_CBC_SHA         "EXP-DHE-RSA-DES-CBC-SHA"
# define SSL3_TXT_DHE_RSA_DES_64_CBC_SHA         "DHE-RSA-DES-CBC-SHA"
# define SSL3_TXT_DHE_RSA_DES_192_CBC3_SHA       "DHE-RSA-DES-CBC3-SHA"

/*
 * This next block of six "EDH" labels is for backward compatibility with
 * older versions of OpenSSL.  New code should use the six "DHE" labels above
 * instead:
 */
# define SSL3_TXT_EDH_DSS_DES_40_CBC_SHA         "EXP-EDH-DSS-DES-CBC-SHA"
# define SSL3_TXT_EDH_DSS_DES_64_CBC_SHA         "EDH-DSS-DES-CBC-SHA"
# define SSL3_TXT_EDH_DSS_DES_192_CBC3_SHA       "EDH-DSS-DES-CBC3-SHA"
# define SSL3_TXT_EDH_RSA_DES_40_CBC_SHA         "EXP-EDH-RSA-DES-CBC-SHA"
# define SSL3_TXT_EDH_RSA_DES_64_CBC_SHA         "EDH-RSA-DES-CBC-SHA"
# define SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA       "EDH-RSA-DES-CBC3-SHA"

# define SSL3_TXT_ADH_RC4_40_MD5                 "EXP-ADH-RC4-MD5"
# define SSL3_TXT_ADH_RC4_128_MD5                "ADH-RC4-MD5"
# define SSL3_TXT_ADH_DES_40_CBC_SHA             "EXP-ADH-DES-CBC-SHA"
# define SSL3_TXT_ADH_DES_64_CBC_SHA             "ADH-DES-CBC-SHA"
# define SSL3_TXT_ADH_DES_192_CBC_SHA            "ADH-DES-CBC3-SHA"

# if 0
#  define SSL3_TXT_FZA_DMS_NULL_SHA               "FZA-NULL-SHA"
#  define SSL3_TXT_FZA_DMS_FZA_SHA                "FZA-FZA-CBC-SHA"
#  define SSL3_TXT_FZA_DMS_RC4_SHA                "FZA-RC4-SHA"
# endif

# define SSL3_TXT_KRB5_DES_64_CBC_SHA            "KRB5-DES-CBC-SHA"
# define SSL3_TXT_KRB5_DES_192_CBC3_SHA          "KRB5-DES-CBC3-SHA"
# define SSL3_TXT_KRB5_RC4_128_SHA               "KRB5-RC4-SHA"
# define SSL3_TXT_KRB5_IDEA_128_CBC_SHA          "KRB5-IDEA-CBC-SHA"
# define SSL3_TXT_KRB5_DES_64_CBC_MD5            "KRB5-DES-CBC-MD5"
# define SSL3_TXT_KRB5_DES_192_CBC3_MD5          "KRB5-DES-CBC3-MD5"
# define SSL3_TXT_KRB5_RC4_128_MD5               "KRB5-RC4-MD5"
# define SSL3_TXT_KRB5_IDEA_128_CBC_MD5          "KRB5-IDEA-CBC-MD5"

# define SSL3_TXT_KRB5_DES_40_CBC_SHA            "EXP-KRB5-DES-CBC-SHA"
# define SSL3_TXT_KRB5_RC2_40_CBC_SHA            "EXP-KRB5-RC2-CBC-SHA"
# define SSL3_TXT_KRB5_RC4_40_SHA                "EXP-KRB5-RC4-SHA"
# define SSL3_TXT_KRB5_DES_40_CBC_MD5            "EXP-KRB5-DES-CBC-MD5"
# define SSL3_TXT_KRB5_RC2_40_CBC_MD5            "EXP-KRB5-RC2-CBC-MD5"
# define SSL3_TXT_KRB5_RC4_40_MD5                "EXP-KRB5-RC4-MD5"

# define SSL3_SSL_SESSION_ID_LENGTH              32
# define SSL3_MAX_SSL_SESSION_ID_LENGTH          32

# define SSL3_MASTER_SECRET_SIZE                 48
# define SSL3_RANDOM_SIZE                        32
# define SSL3_SESSION_ID_SIZE                    32
# define SSL3_RT_HEADER_LENGTH                   5

# define SSL3_HM_HEADER_LENGTH                  4

# ifndef SSL3_ALIGN_PAYLOAD
 /*
  * Some will argue that this increases memory footprint, but it's not
  * actually true. Point is that malloc has to return at least 64-bit aligned
  * pointers, meaning that allocating 5 bytes wastes 3 bytes in either case.
  * Suggested pre-gaping simply moves these wasted bytes from the end of
  * allocated region to its front, but makes data payload aligned, which
  * improves performance:-)
  */
#  define SSL3_ALIGN_PAYLOAD                     8
# else
#  if (SSL3_ALIGN_PAYLOAD&(SSL3_ALIGN_PAYLOAD-1))!=0
#   error "insane SSL3_ALIGN_PAYLOAD"
#   undef SSL3_ALIGN_PAYLOAD
#  endif
# endif

/*
 * This is the maximum MAC (digest) size used by the SSL library. Currently
 * maximum of 20 is used by SHA1, but we reserve for future extension for
 * 512-bit hashes.
 */

# define SSL3_RT_MAX_MD_SIZE                     64

/*
 * Maximum block size used in all ciphersuites. Currently 16 for AES.
 */

# define SSL_RT_MAX_CIPHER_BLOCK_SIZE            16

# define SSL3_RT_MAX_EXTRA                       (16384)

/* Maximum plaintext length: defined by SSL/TLS standards */
# define SSL3_RT_MAX_PLAIN_LENGTH                16384
/* Maximum compression overhead: defined by SSL/TLS standards */
# define SSL3_RT_MAX_COMPRESSED_OVERHEAD         1024

/*
 * The standards give a maximum encryption overhead of 1024 bytes. In
 * practice the value is lower than this. The overhead is the maximum number
 * of padding bytes (256) plus the mac size.
 */
# define SSL3_RT_MAX_ENCRYPTED_OVERHEAD  (256 + SSL3_RT_MAX_MD_SIZE)

/*
 * OpenSSL currently only uses a padding length of at most one block so the
 * send overhead is smaller.
 */

# define SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD \
                        (SSL_RT_MAX_CIPHER_BLOCK_SIZE + SSL3_RT_MAX_MD_SIZE)

/* If compression isn't used don't include the compression overhead */

# ifdef OPENSSL_NO_COMP
#  define SSL3_RT_MAX_COMPRESSED_LENGTH           SSL3_RT_MAX_PLAIN_LENGTH
# else
#  define SSL3_RT_MAX_COMPRESSED_LENGTH   \
                (SSL3_RT_MAX_PLAIN_LENGTH+SSL3_RT_MAX_COMPRESSED_OVERHEAD)
# endif
# define SSL3_RT_MAX_ENCRYPTED_LENGTH    \
                (SSL3_RT_MAX_ENCRYPTED_OVERHEAD+SSL3_RT_MAX_COMPRESSED_LENGTH)
# define SSL3_RT_MAX_PACKET_SIZE         \
                (SSL3_RT_MAX_ENCRYPTED_LENGTH+SSL3_RT_HEADER_LENGTH)

# define SSL3_MD_CLIENT_FINISHED_CONST   "\x43\x4C\x4E\x54"
# define SSL3_MD_SERVER_FINISHED_CONST   "\x53\x52\x56\x52"

# define SSL3_VERSION                    0x0300
# define SSL3_VERSION_MAJOR              0x03
# define SSL3_VERSION_MINOR              0x00

# define SSL3_RT_CHANGE_CIPHER_SPEC      20
# define SSL3_RT_ALERT                   21
# define SSL3_RT_HANDSHAKE               22
# define SSL3_RT_APPLICATION_DATA        23
# define TLS1_RT_HEARTBEAT               24

/* Pseudo content types to indicate additional parameters */
# define TLS1_RT_CRYPTO                  0x1000
# define TLS1_RT_CRYPTO_PREMASTER        (TLS1_RT_CRYPTO | 0x1)
# define TLS1_RT_CRYPTO_CLIENT_RANDOM    (TLS1_RT_CRYPTO | 0x2)
# define TLS1_RT_CRYPTO_SERVER_RANDOM    (TLS1_RT_CRYPTO | 0x3)
# define TLS1_RT_CRYPTO_MASTER           (TLS1_RT_CRYPTO | 0x4)

# define TLS1_RT_CRYPTO_READ             0x0000
# define TLS1_RT_CRYPTO_WRITE            0x0100
# define TLS1_RT_CRYPTO_MAC              (TLS1_RT_CRYPTO | 0x5)
# define TLS1_RT_CRYPTO_KEY              (TLS1_RT_CRYPTO | 0x6)
# define TLS1_RT_CRYPTO_IV               (TLS1_RT_CRYPTO | 0x7)
# define TLS1_RT_CRYPTO_FIXED_IV         (TLS1_RT_CRYPTO | 0x8)

/* Pseudo content type for SSL/TLS header info */
# define SSL3_RT_HEADER                  0x100

# define SSL3_AL_WARNING                 1
# define SSL3_AL_FATAL                   2

# define SSL3_AD_CLOSE_NOTIFY             0
# define SSL3_AD_UNEXPECTED_MESSAGE      10/* fatal */
# define SSL3_AD_BAD_RECORD_MAC          20/* fatal */
# define SSL3_AD_DECOMPRESSION_FAILURE   30/* fatal */
# define SSL3_AD_HANDSHAKE_FAILURE       40/* fatal */
# define SSL3_AD_NO_CERTIFICATE          41
# define SSL3_AD_BAD_CERTIFICATE         42
# define SSL3_AD_UNSUPPORTED_CERTIFICATE 43
# define SSL3_AD_CERTIFICATE_REVOKED     44
# define SSL3_AD_CERTIFICATE_EXPIRED     45
# define SSL3_AD_CERTIFICATE_UNKNOWN     46
# define SSL3_AD_ILLEGAL_PARAMETER       47/* fatal */

# define TLS1_HB_REQUEST         1
# define TLS1_HB_RESPONSE        2

# ifndef OPENSSL_NO_SSL_INTERN

typedef struct ssl3_record_st {
    /* type of record */
    /*
     * r
     */ int type;
    /* How many bytes available */
    /*
     * rw
     */ unsigned int length;
    /* read/write offset into 'buf' */
    /*
     * r
     */ unsigned int off;
    /* pointer to the record data */
    /*
     * rw
     */ unsigned char *data;
    /* where the decode bytes are */
    /*
     * rw
     */ unsigned char *input;
    /* only used with decompression - malloc()ed */
    /*
     * r
     */ unsigned char *comp;
    /* epoch number, needed by DTLS1 */
    /*
     * r
     */ unsigned long epoch;
    /* sequence number, needed by DTLS1 */
    /*
     * r
     */ unsigned char seq_num[8];
} SSL3_RECORD;

typedef struct ssl3_buffer_st {
    /* at least SSL3_RT_MAX_PACKET_SIZE bytes, see ssl3_setup_buffers() */
    unsigned char *buf;
    /* buffer size */
    size_t len;
    /* where to 'copy from' */
    int offset;
    /* how many bytes left */
    int left;
} SSL3_BUFFER;

# endif

# define SSL3_CT_RSA_SIGN                        1
# define SSL3_CT_DSS_SIGN                        2
# define SSL3_CT_RSA_FIXED_DH                    3
# define SSL3_CT_DSS_FIXED_DH                    4
# define SSL3_CT_RSA_EPHEMERAL_DH                5
# define SSL3_CT_DSS_EPHEMERAL_DH                6
# define SSL3_CT_FORTEZZA_DMS                    20
/*
 * SSL3_CT_NUMBER is used to size arrays and it must be large enough to
 * contain all of the cert types defined either for SSLv3 and TLSv1.
 */
# define SSL3_CT_NUMBER                  9

# define SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS       0x0001
# define SSL3_FLAGS_DELAY_CLIENT_FINISHED        0x0002
# define SSL3_FLAGS_POP_BUFFER                   0x0004
# define TLS1_FLAGS_TLS_PADDING_BUG              0x0008
# define TLS1_FLAGS_SKIP_CERT_VERIFY             0x0010
# define TLS1_FLAGS_KEEP_HANDSHAKE               0x0020
/*
 * Set when the handshake is ready to process peer's ChangeCipherSpec message.
 * Cleared after the message has been processed.
 */
# define SSL3_FLAGS_CCS_OK                       0x0080

/* SSL3_FLAGS_SGC_RESTART_DONE is no longer used */
# define SSL3_FLAGS_SGC_RESTART_DONE             0x0040

# ifndef OPENSSL_NO_SSL_INTERN

typedef struct ssl3_state_st {
    long flags;
    int delay_buf_pop_ret;
    unsigned char read_sequence[8];
    int read_mac_secret_size;
    unsigned char read_mac_secret[EVP_MAX_MD_SIZE];
    unsigned char write_sequence[8];
    int write_mac_secret_size;
    unsigned char write_mac_secret[EVP_MAX_MD_SIZE];
    unsigned char server_random[SSL3_RANDOM_SIZE];
    unsigned char client_random[SSL3_RANDOM_SIZE];
    /* flags for countermeasure against known-IV weakness */
    int need_empty_fragments;
    int empty_fragment_done;
    /* The value of 'extra' when the buffers were initialized */
    int init_extra;
    SSL3_BUFFER rbuf;           /* read IO goes into here */
    SSL3_BUFFER wbuf;           /* write IO goes into here */
    SSL3_RECORD rrec;           /* each decoded record goes in here */
    SSL3_RECORD wrec;           /* goes out from here */
    /*
     * storage for Alert/Handshake protocol data received but not yet
     * processed by ssl3_read_bytes:
     */
    unsigned char alert_fragment[2];
    unsigned int alert_fragment_len;
    unsigned char handshake_fragment[4];
    unsigned int handshake_fragment_len;
    /* partial write - check the numbers match */
    unsigned int wnum;          /* number of bytes sent so far */
    int wpend_tot;              /* number bytes written */
    int wpend_type;
    int wpend_ret;              /* number of bytes submitted */
    const unsigned char *wpend_buf;
    /* used during startup, digest all incoming/outgoing packets */
    BIO *handshake_buffer;
    /*
     * When set of handshake digests is determined, buffer is hashed and
     * freed and MD_CTX-es for all required digests are stored in this array
     */
    EVP_MD_CTX **handshake_dgst;
    /*
     * Set whenever an expected ChangeCipherSpec message is processed.
     * Unset when the peer's Finished message is received.
     * Unexpected ChangeCipherSpec messages trigger a fatal alert.
     */
    int change_cipher_spec;
    int warn_alert;
    int fatal_alert;
    /*
     * we allow one fatal and one warning alert to be outstanding, send close
     * alert via the warning alert
     */
    int alert_dispatch;
    unsigned char send_alert[2];
    /*
     * This flag is set when we should renegotiate ASAP, basically when there
     * is no more data in the read or write buffers
     */
    int renegotiate;
    int total_renegotiations;
    int num_renegotiations;
    int in_read_app_data;
    /*
     * Opaque PRF input as used for the current handshake. These fields are
     * used only if TLSEXT_TYPE_opaque_prf_input is defined (otherwise, they
     * are merely present to improve binary compatibility)
     */
    void *client_opaque_prf_input;
    size_t client_opaque_prf_input_len;
    void *server_opaque_prf_input;
    size_t server_opaque_prf_input_len;
    struct {
        /* actually only needs to be 16+20 */
        unsigned char cert_verify_md[EVP_MAX_MD_SIZE * 2];
        /* actually only need to be 16+20 for SSLv3 and 12 for TLS */
        unsigned char finish_md[EVP_MAX_MD_SIZE * 2];
        int finish_md_len;
        unsigned char peer_finish_md[EVP_MAX_MD_SIZE * 2];
        int peer_finish_md_len;
        unsigned long message_size;
        int message_type;
        /* used to hold the new cipher we are going to use */
        const SSL_CIPHER *new_cipher;
#  ifndef OPENSSL_NO_DH
        DH *dh;
#  endif
#  ifndef OPENSSL_NO_ECDH
        EC_KEY *ecdh;           /* holds short lived ECDH key */
#  endif
        /* used when SSL_ST_FLUSH_DATA is entered */
        int next_state;
        int reuse_message;
        /* used for certificate requests */
        int cert_req;
        int ctype_num;
        char ctype[SSL3_CT_NUMBER];
        STACK_OF(X509_NAME) *ca_names;
        int use_rsa_tmp;
        int key_block_length;
        unsigned char *key_block;
        const EVP_CIPHER *new_sym_enc;
        const EVP_MD *new_hash;
        int new_mac_pkey_type;
        int new_mac_secret_size;
#  ifndef OPENSSL_NO_COMP
        const SSL_COMP *new_compression;
#  else
        char *new_compression;
#  endif
        int cert_request;
    } tmp;

    /* Connection binding to prevent renegotiation attacks */
    unsigned char previous_client_finished[EVP_MAX_MD_SIZE];
    unsigned char previous_client_finished_len;
    unsigned char previous_server_finished[EVP_MAX_MD_SIZE];
    unsigned char previous_server_finished_len;
    int send_connection_binding; /* TODOEKR */

#  ifndef OPENSSL_NO_NEXTPROTONEG
    /*
     * Set if we saw the Next Protocol Negotiation extension from our peer.
     */
    int next_proto_neg_seen;
#  endif

#  ifndef OPENSSL_NO_TLSEXT
#   ifndef OPENSSL_NO_EC
    /*
     * This is set to true if we believe that this is a version of Safari
     * running on OS X 10.6 or newer. We wish to know this because Safari on
     * 10.8 .. 10.8.3 has broken ECDHE-ECDSA support.
     */
    char is_probably_safari;
#   endif                       /* !OPENSSL_NO_EC */

    /*
     * ALPN information (we are in the process of transitioning from NPN to
     * ALPN.)
     */

    /*
     * In a server these point to the selected ALPN protocol after the
     * ClientHello has been processed. In a client these contain the protocol
     * that the server selected once the ServerHello has been processed.
     */
    unsigned char *alpn_selected;
    unsigned alpn_selected_len;
#  endif                        /* OPENSSL_NO_TLSEXT */
} SSL3_STATE;

# endif

/* SSLv3 */
/*
 * client
 */
/* extra state */
# define SSL3_ST_CW_FLUSH                (0x100|SSL_ST_CONNECT)
# ifndef OPENSSL_NO_SCTP
#  define DTLS1_SCTP_ST_CW_WRITE_SOCK                     (0x310|SSL_ST_CONNECT)
#  define DTLS1_SCTP_ST_CR_READ_SOCK                      (0x320|SSL_ST_CONNECT)
# endif
/* write to server */
# define SSL3_ST_CW_CLNT_HELLO_A         (0x110|SSL_ST_CONNECT)
# define SSL3_ST_CW_CLNT_HELLO_B         (0x111|SSL_ST_CONNECT)
/* read from server */
# define SSL3_ST_CR_SRVR_HELLO_A         (0x120|SSL_ST_CONNECT)
# define SSL3_ST_CR_SRVR_HELLO_B         (0x121|SSL_ST_CONNECT)
# define DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A (0x126|SSL_ST_CONNECT)
# define DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B (0x127|SSL_ST_CONNECT)
# define SSL3_ST_CR_CERT_A               (0x130|SSL_ST_CONNECT)
# define SSL3_ST_CR_CERT_B               (0x131|SSL_ST_CONNECT)
# define SSL3_ST_CR_KEY_EXCH_A           (0x140|SSL_ST_CONNECT)
# define SSL3_ST_CR_KEY_EXCH_B           (0x141|SSL_ST_CONNECT)
# define SSL3_ST_CR_CERT_REQ_A           (0x150|SSL_ST_CONNECT)
# define SSL3_ST_CR_CERT_REQ_B           (0x151|SSL_ST_CONNECT)
# define SSL3_ST_CR_SRVR_DONE_A          (0x160|SSL_ST_CONNECT)
# define SSL3_ST_CR_SRVR_DONE_B          (0x161|SSL_ST_CONNECT)
/* write to server */
# define SSL3_ST_CW_CERT_A               (0x170|SSL_ST_CONNECT)
# define SSL3_ST_CW_CERT_B               (0x171|SSL_ST_CONNECT)
# define SSL3_ST_CW_CERT_C               (0x172|SSL_ST_CONNECT)
# define SSL3_ST_CW_CERT_D               (0x173|SSL_ST_CONNECT)
# define SSL3_ST_CW_KEY_EXCH_A           (0x180|SSL_ST_CONNECT)
# define SSL3_ST_CW_KEY_EXCH_B           (0x181|SSL_ST_CONNECT)
# define SSL3_ST_CW_CERT_VRFY_A          (0x190|SSL_ST_CONNECT)
# define SSL3_ST_CW_CERT_VRFY_B          (0x191|SSL_ST_CONNECT)
# define SSL3_ST_CW_CHANGE_A             (0x1A0|SSL_ST_CONNECT)
# define SSL3_ST_CW_CHANGE_B             (0x1A1|SSL_ST_CONNECT)
# ifndef OPENSSL_NO_NEXTPROTONEG
#  define SSL3_ST_CW_NEXT_PROTO_A         (0x200|SSL_ST_CONNECT)
#  define SSL3_ST_CW_NEXT_PROTO_B         (0x201|SSL_ST_CONNECT)
# endif
# define SSL3_ST_CW_FINISHED_A           (0x1B0|SSL_ST_CONNECT)
# define SSL3_ST_CW_FINISHED_B           (0x1B1|SSL_ST_CONNECT)
/* read from server */
# define SSL3_ST_CR_CHANGE_A             (0x1C0|SSL_ST_CONNECT)
# define SSL3_ST_CR_CHANGE_B             (0x1C1|SSL_ST_CONNECT)
# define SSL3_ST_CR_FINISHED_A           (0x1D0|SSL_ST_CONNECT)
# define SSL3_ST_CR_FINISHED_B           (0x1D1|SSL_ST_CONNECT)
# define SSL3_ST_CR_SESSION_TICKET_A     (0x1E0|SSL_ST_CONNECT)
# define SSL3_ST_CR_SESSION_TICKET_B     (0x1E1|SSL_ST_CONNECT)
# define SSL3_ST_CR_CERT_STATUS_A        (0x1F0|SSL_ST_CONNECT)
# define SSL3_ST_CR_CERT_STATUS_B        (0x1F1|SSL_ST_CONNECT)

/* server */
/* extra state */
# define SSL3_ST_SW_FLUSH                (0x100|SSL_ST_ACCEPT)
# ifndef OPENSSL_NO_SCTP
#  define DTLS1_SCTP_ST_SW_WRITE_SOCK                     (0x310|SSL_ST_ACCEPT)
#  define DTLS1_SCTP_ST_SR_READ_SOCK                      (0x320|SSL_ST_ACCEPT)
# endif
/* read from client */
/* Do not change the number values, they do matter */
# define SSL3_ST_SR_CLNT_HELLO_A         (0x110|SSL_ST_ACCEPT)
# define SSL3_ST_SR_CLNT_HELLO_B         (0x111|SSL_ST_ACCEPT)
# define SSL3_ST_SR_CLNT_HELLO_C         (0x112|SSL_ST_ACCEPT)
# define SSL3_ST_SR_CLNT_HELLO_D         (0x115|SSL_ST_ACCEPT)
/* write to client */
# define DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A (0x113|SSL_ST_ACCEPT)
# define DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B (0x114|SSL_ST_ACCEPT)
# define SSL3_ST_SW_HELLO_REQ_A          (0x120|SSL_ST_ACCEPT)
# define SSL3_ST_SW_HELLO_REQ_B          (0x121|SSL_ST_ACCEPT)
# define SSL3_ST_SW_HELLO_REQ_C          (0x122|SSL_ST_ACCEPT)
# define SSL3_ST_SW_SRVR_HELLO_A         (0x130|SSL_ST_ACCEPT)
# define SSL3_ST_SW_SRVR_HELLO_B         (0x131|SSL_ST_ACCEPT)
# define SSL3_ST_SW_CERT_A               (0x140|SSL_ST_ACCEPT)
# define SSL3_ST_SW_CERT_B               (0x141|SSL_ST_ACCEPT)
# define SSL3_ST_SW_KEY_EXCH_A           (0x150|SSL_ST_ACCEPT)
# define SSL3_ST_SW_KEY_EXCH_B           (0x151|SSL_ST_ACCEPT)
# define SSL3_ST_SW_CERT_REQ_A           (0x160|SSL_ST_ACCEPT)
# define SSL3_ST_SW_CERT_REQ_B           (0x161|SSL_ST_ACCEPT)
# define SSL3_ST_SW_SRVR_DONE_A          (0x170|SSL_ST_ACCEPT)
# define SSL3_ST_SW_SRVR_DONE_B          (0x171|SSL_ST_ACCEPT)
/* read from client */
# define SSL3_ST_SR_CERT_A               (0x180|SSL_ST_ACCEPT)
# define SSL3_ST_SR_CERT_B               (0x181|SSL_ST_ACCEPT)
# define SSL3_ST_SR_KEY_EXCH_A           (0x190|SSL_ST_ACCEPT)
# define SSL3_ST_SR_KEY_EXCH_B           (0x191|SSL_ST_ACCEPT)
# define SSL3_ST_SR_CERT_VRFY_A          (0x1A0|SSL_ST_ACCEPT)
# define SSL3_ST_SR_CERT_VRFY_B          (0x1A1|SSL_ST_ACCEPT)
# define SSL3_ST_SR_CHANGE_A             (0x1B0|SSL_ST_ACCEPT)
# define SSL3_ST_SR_CHANGE_B             (0x1B1|SSL_ST_ACCEPT)
# ifndef OPENSSL_NO_NEXTPROTONEG
#  define SSL3_ST_SR_NEXT_PROTO_A         (0x210|SSL_ST_ACCEPT)
#  define SSL3_ST_SR_NEXT_PROTO_B         (0x211|SSL_ST_ACCEPT)
# endif
# define SSL3_ST_SR_FINISHED_A           (0x1C0|SSL_ST_ACCEPT)
# define SSL3_ST_SR_FINISHED_B           (0x1C1|SSL_ST_ACCEPT)
/* write to client */
# define SSL3_ST_SW_CHANGE_A             (0x1D0|SSL_ST_ACCEPT)
# define SSL3_ST_SW_CHANGE_B             (0x1D1|SSL_ST_ACCEPT)
# define SSL3_ST_SW_FINISHED_A           (0x1E0|SSL_ST_ACCEPT)
# define SSL3_ST_SW_FINISHED_B           (0x1E1|SSL_ST_ACCEPT)
# define SSL3_ST_SW_SESSION_TICKET_A     (0x1F0|SSL_ST_ACCEPT)
# define SSL3_ST_SW_SESSION_TICKET_B     (0x1F1|SSL_ST_ACCEPT)
# define SSL3_ST_SW_CERT_STATUS_A        (0x200|SSL_ST_ACCEPT)
# define SSL3_ST_SW_CERT_STATUS_B        (0x201|SSL_ST_ACCEPT)

# define SSL3_MT_HELLO_REQUEST                   0
# define SSL3_MT_CLIENT_HELLO                    1
# define SSL3_MT_SERVER_HELLO                    2
# define SSL3_MT_NEWSESSION_TICKET               4
# define SSL3_MT_CERTIFICATE                     11
# define SSL3_MT_SERVER_KEY_EXCHANGE             12
# define SSL3_MT_CERTIFICATE_REQUEST             13
# define SSL3_MT_SERVER_DONE                     14
# define SSL3_MT_CERTIFICATE_VERIFY              15
# define SSL3_MT_CLIENT_KEY_EXCHANGE             16
# define SSL3_MT_FINISHED                        20
# define SSL3_MT_CERTIFICATE_STATUS              22
# ifndef OPENSSL_NO_NEXTPROTONEG
#  define SSL3_MT_NEXT_PROTO                      67
# endif
# define DTLS1_MT_HELLO_VERIFY_REQUEST    3

# define SSL3_MT_CCS                             1

/* These are used when changing over to a new cipher */
# define SSL3_CC_READ            0x01
# define SSL3_CC_WRITE           0x02
# define SSL3_CC_CLIENT          0x10
# define SSL3_CC_SERVER          0x20
# define SSL3_CHANGE_CIPHER_CLIENT_WRITE (SSL3_CC_CLIENT|SSL3_CC_WRITE)
# define SSL3_CHANGE_CIPHER_SERVER_READ  (SSL3_CC_SERVER|SSL3_CC_READ)
# define SSL3_CHANGE_CIPHER_CLIENT_READ  (SSL3_CC_CLIENT|SSL3_CC_READ)
# define SSL3_CHANGE_CIPHER_SERVER_WRITE (SSL3_CC_SERVER|SSL3_CC_WRITE)

#ifdef  __cplusplus
}
#endif
#endif