boringssl/include/openssl/ssl3.h

/* 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 

#include <openssl/buf.h>
#include <openssl/evp.h>
#include <openssl/ssl.h>

#ifdef  __cplusplus
extern "C" {
#endif

/* Signalling cipher suite value: from draft-ietf-tls-renegotiation-03.txt */
#define SSL3_CK_SCSV				0x030000FF
/* Fallback signalling cipher suite value: not IANA assigned.
 * See https://tools.ietf.org/html/draft-bmoeller-tls-downgrade-scsv-01 */
#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_EDH_DSS_DES_64_CBC_SHA		0x03000012
#define SSL3_CK_EDH_DSS_DES_192_CBC3_SHA	0x03000013
#define SSL3_CK_EDH_RSA_DES_40_CBC_SHA		0x03000014
#define SSL3_CK_EDH_RSA_DES_64_CBC_SHA		0x03000015
#define SSL3_CK_EDH_RSA_DES_192_CBC3_SHA	0x03000016

#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

#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_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"

#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 */

#define SSL3_RT_MAX_COMPRESSED_LENGTH	\
		(SSL3_RT_MAX_PLAIN_LENGTH+SSL3_RT_MAX_COMPRESSED_OVERHEAD)
#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

/* 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 SSL3_AD_INAPPROPRIATE_FALLBACK	86	/* fatal */

#ifndef OPENSSL_NO_SSL_INTERN

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

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


#define SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS	0x0001
#define SSL3_FLAGS_POP_BUFFER			0x0004
#define TLS1_FLAGS_TLS_PADDING_BUG		0x0008
/* TODO(davidben): This flag can probably be merged into s3->change_cipher_spec
 * to something tri-state. (Normal / Expect CCS / Between CCS and Finished). */
#define SSL3_FLAGS_EXPECT_CCS			0x0080

#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_record_splitting;
	int record_split_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;
	/* this is set whenerver we see a change_cipher_spec message
	 * come in when we are not looking for one */
	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;

	/* State pertaining to the pending handshake.
	 *
	 * TODO(davidben): State is current spread all over the place. Move
	 * pending handshake state here so it can be managed separately from
	 * established connection state in case of renegotiations.
	 */
	struct	{
		/* 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;
		DH *dh;

		EC_KEY *ecdh; /* holds short lived ECDH key */

		/* used when SSL_ST_FLUSH_DATA is entered */
		int next_state;			

		int reuse_message;

		/* Client-only: cert_req determines if a client certificate is
		 * to be sent. This is 0 if no client Certificate message is to
		 * be sent, 1 if there is a client certificate, and 2 to send an
		 * empty client Certificate message. */
		int cert_req;

		/* Client-only: ca_names contains the list of CAs received in a
		 * CertificateRequest message. */
		STACK_OF(X509_NAME) *ca_names;

		/* Client-only: certificate_types contains the set of
		 * certificate types received in a CertificateRequest
		 * message. */
		unsigned char *certificate_types;
		size_t num_certificate_types;

		int key_block_length;
		unsigned char *key_block;

		const EVP_CIPHER *new_sym_enc;
		const EVP_AEAD *new_aead;
		const EVP_MD *new_hash;
		int new_mac_pkey_type;
		int new_mac_secret_size;

		/* Server-only: cert_request is true if a client certificate was
		 * requested. */
		int cert_request;

		/* certificate_status_expected is true if OCSP stapling was
		 * negotiated and the server is expected to send a
		 * CertificateStatus message. */
		char certificate_status_expected;
		} 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 */

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

	/* 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. */
	uint8_t *alpn_selected;
	size_t alpn_selected_len;

	/* In a client, this means that the server supported Channel ID and that
	 * a Channel ID was sent. In a server it means that we echoed support
	 * for Channel IDs and that tlsext_channel_id will be valid after the
	 * handshake. */
	char tlsext_channel_id_valid;
	/* tlsext_channel_id_new means that the updated Channel ID extension
	 * was negotiated. This is a temporary hack in the code to support both
	 * forms of Channel ID extension while we transition to the new format,
	 * which fixed a security issue. */
	char tlsext_channel_id_new;
	/* For a server:
	 *     If |tlsext_channel_id_valid| is true, then this contains the
	 *     verified Channel ID from the client: a P256 point, (x,y), where
	 *     each are big-endian values. */
	unsigned char tlsext_channel_id[64];
	} SSL3_STATE;

#endif

/* SSLv3 */
/*client */
/* extra state */
#define SSL3_ST_CW_FLUSH		(0x100|SSL_ST_CONNECT)
#define SSL3_ST_CUTTHROUGH_COMPLETE	(0x101|SSL_ST_CONNECT)
/* 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)
#define SSL3_ST_CW_NEXT_PROTO_A		(0x200|SSL_ST_CONNECT)
#define SSL3_ST_CW_NEXT_PROTO_B		(0x201|SSL_ST_CONNECT)
#define SSL3_ST_CW_CHANNEL_ID_A		(0x220|SSL_ST_CONNECT)
#define SSL3_ST_CW_CHANNEL_ID_B		(0x221|SSL_ST_CONNECT)
#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		(0x1C0|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)
/* 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		(0x1B0|SSL_ST_ACCEPT)
#define SSL3_ST_SR_NEXT_PROTO_A		(0x210|SSL_ST_ACCEPT)
#define SSL3_ST_SR_NEXT_PROTO_B		(0x211|SSL_ST_ACCEPT)
#define SSL3_ST_SR_CHANNEL_ID_A		(0x230|SSL_ST_ACCEPT)
#define SSL3_ST_SR_CHANNEL_ID_B		(0x231|SSL_ST_ACCEPT)
#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_ST_SW_SUPPLEMENTAL_DATA_A	(0x220|SSL_ST_ACCEPT)
#define SSL3_ST_SW_SUPPLEMENTAL_DATA_B	(0x221|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
#define SSL3_MT_SUPPLEMENTAL_DATA		23
#define SSL3_MT_NEXT_PROTO			67
#define SSL3_MT_ENCRYPTED_EXTENSIONS		203
#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