path: root/contrib/libs/openssl/ssl/ssl_local.h

/* 
 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved 
 * Copyright 2005 Nokia. All rights reserved. 
 * 
 * Licensed under the OpenSSL license (the "License").  You may not use 
 * this file except in compliance with the License.  You can obtain a copy 
 * in the file LICENSE in the source distribution or at 
 * https://www.openssl.org/source/license.html 
 */ 
 
#ifndef OSSL_SSL_LOCAL_H 
# define OSSL_SSL_LOCAL_H 
 
# include "e_os.h"              /* struct timeval for DTLS */ 
# include <stdlib.h> 
# include <time.h> 
# include <string.h> 
# include <errno.h> 
 
# include <openssl/buffer.h> 
# include <openssl/comp.h> 
# include <openssl/bio.h> 
# include <openssl/rsa.h> 
# include <openssl/dsa.h> 
# include <openssl/err.h> 
# include <openssl/ssl.h> 
# include <openssl/async.h> 
# include <openssl/symhacks.h> 
# include <openssl/ct.h> 
# include "record/record.h" 
# include "statem/statem.h" 
# include "packet_local.h" 
# include "internal/dane.h" 
# include "internal/refcount.h" 
# include "internal/tsan_assist.h" 
 
# ifdef OPENSSL_BUILD_SHLIBSSL 
#  undef OPENSSL_EXTERN 
#  define OPENSSL_EXTERN OPENSSL_EXPORT 
# endif 
 
# define c2l(c,l)        (l = ((unsigned long)(*((c)++)))     , \ 
                         l|=(((unsigned long)(*((c)++)))<< 8), \ 
                         l|=(((unsigned long)(*((c)++)))<<16), \ 
                         l|=(((unsigned long)(*((c)++)))<<24)) 
 
/* NOTE - c is not incremented as per c2l */ 
# define c2ln(c,l1,l2,n) { \ 
                        c+=n; \ 
                        l1=l2=0; \ 
                        switch (n) { \ 
                        case 8: l2 =((unsigned long)(*(--(c))))<<24; \ 
                        case 7: l2|=((unsigned long)(*(--(c))))<<16; \ 
                        case 6: l2|=((unsigned long)(*(--(c))))<< 8; \ 
                        case 5: l2|=((unsigned long)(*(--(c))));     \ 
                        case 4: l1 =((unsigned long)(*(--(c))))<<24; \ 
                        case 3: l1|=((unsigned long)(*(--(c))))<<16; \ 
                        case 2: l1|=((unsigned long)(*(--(c))))<< 8; \ 
                        case 1: l1|=((unsigned long)(*(--(c))));     \ 
                                } \ 
                        } 
 
# define l2c(l,c)        (*((c)++)=(unsigned char)(((l)    )&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>> 8)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>>16)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>>24)&0xff)) 
 
# define n2l(c,l)        (l =((unsigned long)(*((c)++)))<<24, \ 
                         l|=((unsigned long)(*((c)++)))<<16, \ 
                         l|=((unsigned long)(*((c)++)))<< 8, \ 
                         l|=((unsigned long)(*((c)++)))) 
 
# define n2l8(c,l)       (l =((uint64_t)(*((c)++)))<<56, \ 
                         l|=((uint64_t)(*((c)++)))<<48, \ 
                         l|=((uint64_t)(*((c)++)))<<40, \ 
                         l|=((uint64_t)(*((c)++)))<<32, \ 
                         l|=((uint64_t)(*((c)++)))<<24, \ 
                         l|=((uint64_t)(*((c)++)))<<16, \ 
                         l|=((uint64_t)(*((c)++)))<< 8, \ 
                         l|=((uint64_t)(*((c)++)))) 
 
 
# define l2n(l,c)        (*((c)++)=(unsigned char)(((l)>>24)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>>16)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>> 8)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)    )&0xff)) 
 
# define l2n6(l,c)       (*((c)++)=(unsigned char)(((l)>>40)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>>32)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>>24)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>>16)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>> 8)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)    )&0xff)) 
 
# define l2n8(l,c)       (*((c)++)=(unsigned char)(((l)>>56)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>>48)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>>40)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>>32)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>>24)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>>16)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)>> 8)&0xff), \ 
                         *((c)++)=(unsigned char)(((l)    )&0xff)) 
 
/* NOTE - c is not incremented as per l2c */ 
# define l2cn(l1,l2,c,n) { \ 
                        c+=n; \ 
                        switch (n) { \ 
                        case 8: *(--(c))=(unsigned char)(((l2)>>24)&0xff); \ 
                        case 7: *(--(c))=(unsigned char)(((l2)>>16)&0xff); \ 
                        case 6: *(--(c))=(unsigned char)(((l2)>> 8)&0xff); \ 
                        case 5: *(--(c))=(unsigned char)(((l2)    )&0xff); \ 
                        case 4: *(--(c))=(unsigned char)(((l1)>>24)&0xff); \ 
                        case 3: *(--(c))=(unsigned char)(((l1)>>16)&0xff); \ 
                        case 2: *(--(c))=(unsigned char)(((l1)>> 8)&0xff); \ 
                        case 1: *(--(c))=(unsigned char)(((l1)    )&0xff); \ 
                                } \ 
                        } 
 
# define n2s(c,s)        ((s=(((unsigned int)((c)[0]))<< 8)| \ 
                             (((unsigned int)((c)[1]))    )),(c)+=2) 
# define s2n(s,c)        (((c)[0]=(unsigned char)(((s)>> 8)&0xff), \ 
                           (c)[1]=(unsigned char)(((s)    )&0xff)),(c)+=2) 
 
# define n2l3(c,l)       ((l =(((unsigned long)((c)[0]))<<16)| \ 
                              (((unsigned long)((c)[1]))<< 8)| \ 
                              (((unsigned long)((c)[2]))    )),(c)+=3) 
 
# define l2n3(l,c)       (((c)[0]=(unsigned char)(((l)>>16)&0xff), \ 
                           (c)[1]=(unsigned char)(((l)>> 8)&0xff), \ 
                           (c)[2]=(unsigned char)(((l)    )&0xff)),(c)+=3) 
 
/* 
 * DTLS version numbers are strange because they're inverted. Except for 
 * DTLS1_BAD_VER, which should be considered "lower" than the rest. 
 */ 
# define dtls_ver_ordinal(v1) (((v1) == DTLS1_BAD_VER) ? 0xff00 : (v1)) 
# define DTLS_VERSION_GT(v1, v2) (dtls_ver_ordinal(v1) < dtls_ver_ordinal(v2)) 
# define DTLS_VERSION_GE(v1, v2) (dtls_ver_ordinal(v1) <= dtls_ver_ordinal(v2)) 
# define DTLS_VERSION_LT(v1, v2) (dtls_ver_ordinal(v1) > dtls_ver_ordinal(v2)) 
# define DTLS_VERSION_LE(v1, v2) (dtls_ver_ordinal(v1) >= dtls_ver_ordinal(v2)) 
 
 
/* 
 * Define the Bitmasks for SSL_CIPHER.algorithms. 
 * This bits are used packed as dense as possible. If new methods/ciphers 
 * etc will be added, the bits a likely to change, so this information 
 * is for internal library use only, even though SSL_CIPHER.algorithms 
 * can be publicly accessed. 
 * Use the according functions for cipher management instead. 
 * 
 * The bit mask handling in the selection and sorting scheme in 
 * ssl_create_cipher_list() has only limited capabilities, reflecting 
 * that the different entities within are mutually exclusive: 
 * ONLY ONE BIT PER MASK CAN BE SET AT A TIME. 
 */ 
 
/* Bits for algorithm_mkey (key exchange algorithm) */ 
/* RSA key exchange */ 
# define SSL_kRSA                0x00000001U 
/* tmp DH key no DH cert */ 
# define SSL_kDHE                0x00000002U 
/* synonym */ 
# define SSL_kEDH                SSL_kDHE 
/* ephemeral ECDH */ 
# define SSL_kECDHE              0x00000004U 
/* synonym */ 
# define SSL_kEECDH              SSL_kECDHE 
/* PSK */ 
# define SSL_kPSK                0x00000008U 
/* GOST key exchange */ 
# define SSL_kGOST               0x00000010U 
/* SRP */ 
# define SSL_kSRP                0x00000020U 
 
# define SSL_kRSAPSK             0x00000040U 
# define SSL_kECDHEPSK           0x00000080U 
# define SSL_kDHEPSK             0x00000100U 
 
/* all PSK */ 
 
# define SSL_PSK     (SSL_kPSK | SSL_kRSAPSK | SSL_kECDHEPSK | SSL_kDHEPSK) 
 
/* Any appropriate key exchange algorithm (for TLS 1.3 ciphersuites) */ 
# define SSL_kANY                0x00000000U 
 
/* Bits for algorithm_auth (server authentication) */ 
/* RSA auth */ 
# define SSL_aRSA                0x00000001U 
/* DSS auth */ 
# define SSL_aDSS                0x00000002U 
/* no auth (i.e. use ADH or AECDH) */ 
# define SSL_aNULL               0x00000004U 
/* ECDSA auth*/ 
# define SSL_aECDSA              0x00000008U 
/* PSK auth */ 
# define SSL_aPSK                0x00000010U 
/* GOST R 34.10-2001 signature auth */ 
# define SSL_aGOST01             0x00000020U 
/* SRP auth */ 
# define SSL_aSRP                0x00000040U 
/* GOST R 34.10-2012 signature auth */ 
# define SSL_aGOST12             0x00000080U 
/* Any appropriate signature auth (for TLS 1.3 ciphersuites) */ 
# define SSL_aANY                0x00000000U 
/* All bits requiring a certificate */ 
#define SSL_aCERT \ 
    (SSL_aRSA | SSL_aDSS | SSL_aECDSA | SSL_aGOST01 | SSL_aGOST12) 
 
/* Bits for algorithm_enc (symmetric encryption) */ 
# define SSL_DES                 0x00000001U 
# define SSL_3DES                0x00000002U 
# define SSL_RC4                 0x00000004U 
# define SSL_RC2                 0x00000008U 
# define SSL_IDEA                0x00000010U 
# define SSL_eNULL               0x00000020U 
# define SSL_AES128              0x00000040U 
# define SSL_AES256              0x00000080U 
# define SSL_CAMELLIA128         0x00000100U 
# define SSL_CAMELLIA256         0x00000200U 
# define SSL_eGOST2814789CNT     0x00000400U 
# define SSL_SEED                0x00000800U 
# define SSL_AES128GCM           0x00001000U 
# define SSL_AES256GCM           0x00002000U 
# define SSL_AES128CCM           0x00004000U 
# define SSL_AES256CCM           0x00008000U 
# define SSL_AES128CCM8          0x00010000U 
# define SSL_AES256CCM8          0x00020000U 
# define SSL_eGOST2814789CNT12   0x00040000U 
# define SSL_CHACHA20POLY1305    0x00080000U 
# define SSL_ARIA128GCM          0x00100000U 
# define SSL_ARIA256GCM          0x00200000U 
 
# define SSL_AESGCM              (SSL_AES128GCM | SSL_AES256GCM) 
# define SSL_AESCCM              (SSL_AES128CCM | SSL_AES256CCM | SSL_AES128CCM8 | SSL_AES256CCM8) 
# define SSL_AES                 (SSL_AES128|SSL_AES256|SSL_AESGCM|SSL_AESCCM) 
# define SSL_CAMELLIA            (SSL_CAMELLIA128|SSL_CAMELLIA256) 
# define SSL_CHACHA20            (SSL_CHACHA20POLY1305) 
# define SSL_ARIAGCM             (SSL_ARIA128GCM | SSL_ARIA256GCM) 
# define SSL_ARIA                (SSL_ARIAGCM) 
 
/* Bits for algorithm_mac (symmetric authentication) */ 
 
# define SSL_MD5                 0x00000001U 
# define SSL_SHA1                0x00000002U 
# define SSL_GOST94      0x00000004U 
# define SSL_GOST89MAC   0x00000008U 
# define SSL_SHA256              0x00000010U 
# define SSL_SHA384              0x00000020U 
/* Not a real MAC, just an indication it is part of cipher */ 
# define SSL_AEAD                0x00000040U 
# define SSL_GOST12_256          0x00000080U 
# define SSL_GOST89MAC12         0x00000100U 
# define SSL_GOST12_512          0x00000200U 
 
/* 
 * When adding new digest in the ssl_ciph.c and increment SSL_MD_NUM_IDX make 
 * sure to update this constant too 
 */ 
 
# define SSL_MD_MD5_IDX  0 
# define SSL_MD_SHA1_IDX 1 
# define SSL_MD_GOST94_IDX 2 
# define SSL_MD_GOST89MAC_IDX 3 
# define SSL_MD_SHA256_IDX 4 
# define SSL_MD_SHA384_IDX 5 
# define SSL_MD_GOST12_256_IDX  6 
# define SSL_MD_GOST89MAC12_IDX 7 
# define SSL_MD_GOST12_512_IDX  8 
# define SSL_MD_MD5_SHA1_IDX 9 
# define SSL_MD_SHA224_IDX 10 
# define SSL_MD_SHA512_IDX 11 
# define SSL_MAX_DIGEST 12 
 
/* Bits for algorithm2 (handshake digests and other extra flags) */ 
 
/* Bits 0-7 are handshake MAC */ 
# define SSL_HANDSHAKE_MAC_MASK  0xFF 
# define SSL_HANDSHAKE_MAC_MD5_SHA1 SSL_MD_MD5_SHA1_IDX 
# define SSL_HANDSHAKE_MAC_SHA256   SSL_MD_SHA256_IDX 
# define SSL_HANDSHAKE_MAC_SHA384   SSL_MD_SHA384_IDX 
# define SSL_HANDSHAKE_MAC_GOST94 SSL_MD_GOST94_IDX 
# define SSL_HANDSHAKE_MAC_GOST12_256 SSL_MD_GOST12_256_IDX 
# define SSL_HANDSHAKE_MAC_GOST12_512 SSL_MD_GOST12_512_IDX 
# define SSL_HANDSHAKE_MAC_DEFAULT  SSL_HANDSHAKE_MAC_MD5_SHA1 
 
/* Bits 8-15 bits are PRF */ 
# define TLS1_PRF_DGST_SHIFT 8 
# define TLS1_PRF_SHA1_MD5 (SSL_MD_MD5_SHA1_IDX << TLS1_PRF_DGST_SHIFT) 
# define TLS1_PRF_SHA256 (SSL_MD_SHA256_IDX << TLS1_PRF_DGST_SHIFT) 
# define TLS1_PRF_SHA384 (SSL_MD_SHA384_IDX << TLS1_PRF_DGST_SHIFT) 
# define TLS1_PRF_GOST94 (SSL_MD_GOST94_IDX << TLS1_PRF_DGST_SHIFT) 
# define TLS1_PRF_GOST12_256 (SSL_MD_GOST12_256_IDX << TLS1_PRF_DGST_SHIFT) 
# define TLS1_PRF_GOST12_512 (SSL_MD_GOST12_512_IDX << TLS1_PRF_DGST_SHIFT) 
# define TLS1_PRF            (SSL_MD_MD5_SHA1_IDX << TLS1_PRF_DGST_SHIFT) 
 
/* 
 * Stream MAC for GOST ciphersuites from cryptopro draft (currently this also 
 * goes into algorithm2) 
 */ 
# define TLS1_STREAM_MAC 0x10000 
 
# define SSL_STRONG_MASK         0x0000001FU 
# define SSL_DEFAULT_MASK        0X00000020U 
 
# define SSL_STRONG_NONE         0x00000001U 
# define SSL_LOW                 0x00000002U 
# define SSL_MEDIUM              0x00000004U 
# define SSL_HIGH                0x00000008U 
# define SSL_FIPS                0x00000010U 
# define SSL_NOT_DEFAULT         0x00000020U 
 
/* we have used 0000003f - 26 bits left to go */ 
 
/* Flag used on OpenSSL ciphersuite ids to indicate they are for SSLv3+ */ 
# define SSL3_CK_CIPHERSUITE_FLAG                0x03000000 
 
/* Check if an SSL structure is using DTLS */ 
# define SSL_IS_DTLS(s)  (s->method->ssl3_enc->enc_flags & SSL_ENC_FLAG_DTLS) 
 
/* Check if we are using TLSv1.3 */ 
# define SSL_IS_TLS13(s) (!SSL_IS_DTLS(s) \ 
                          && (s)->method->version >= TLS1_3_VERSION \ 
                          && (s)->method->version != TLS_ANY_VERSION) 
 
# define SSL_TREAT_AS_TLS13(s) \ 
    (SSL_IS_TLS13(s) || (s)->early_data_state == SSL_EARLY_DATA_CONNECTING \ 
     || (s)->early_data_state == SSL_EARLY_DATA_CONNECT_RETRY \ 
     || (s)->early_data_state == SSL_EARLY_DATA_WRITING \ 
     || (s)->early_data_state == SSL_EARLY_DATA_WRITE_RETRY \ 
     || (s)->hello_retry_request == SSL_HRR_PENDING) 
 
# define SSL_IS_FIRST_HANDSHAKE(S) ((s)->s3->tmp.finish_md_len == 0 \ 
                                    || (s)->s3->tmp.peer_finish_md_len == 0) 
 
/* See if we need explicit IV */ 
# define SSL_USE_EXPLICIT_IV(s)  \ 
                (s->method->ssl3_enc->enc_flags & SSL_ENC_FLAG_EXPLICIT_IV) 
/* 
 * See if we use signature algorithms extension and signature algorithm 
 * before signatures. 
 */ 
# define SSL_USE_SIGALGS(s)      \ 
                        (s->method->ssl3_enc->enc_flags & SSL_ENC_FLAG_SIGALGS) 
/* 
 * Allow TLS 1.2 ciphersuites: applies to DTLS 1.2 as well as TLS 1.2: may 
 * apply to others in future. 
 */ 
# define SSL_USE_TLS1_2_CIPHERS(s)       \ 
                (s->method->ssl3_enc->enc_flags & SSL_ENC_FLAG_TLS1_2_CIPHERS) 
/* 
 * Determine if a client can use TLS 1.2 ciphersuites: can't rely on method 
 * flags because it may not be set to correct version yet. 
 */ 
# define SSL_CLIENT_USE_TLS1_2_CIPHERS(s)        \ 
    ((!SSL_IS_DTLS(s) && s->client_version >= TLS1_2_VERSION) || \ 
     (SSL_IS_DTLS(s) && DTLS_VERSION_GE(s->client_version, DTLS1_2_VERSION))) 
/* 
 * Determine if a client should send signature algorithms extension: 
 * as with TLS1.2 cipher we can't rely on method flags. 
 */ 
# define SSL_CLIENT_USE_SIGALGS(s)        \ 
    SSL_CLIENT_USE_TLS1_2_CIPHERS(s) 
 
# define IS_MAX_FRAGMENT_LENGTH_EXT_VALID(value) \ 
    (((value) >= TLSEXT_max_fragment_length_512) && \ 
     ((value) <= TLSEXT_max_fragment_length_4096)) 
# define USE_MAX_FRAGMENT_LENGTH_EXT(session) \ 
    IS_MAX_FRAGMENT_LENGTH_EXT_VALID(session->ext.max_fragment_len_mode) 
# define GET_MAX_FRAGMENT_LENGTH(session) \ 
    (512U << (session->ext.max_fragment_len_mode - 1)) 
 
# define SSL_READ_ETM(s) (s->s3->flags & TLS1_FLAGS_ENCRYPT_THEN_MAC_READ) 
# define SSL_WRITE_ETM(s) (s->s3->flags & TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE) 
 
/* Mostly for SSLv3 */ 
# define SSL_PKEY_RSA            0 
# define SSL_PKEY_RSA_PSS_SIGN   1 
# define SSL_PKEY_DSA_SIGN       2 
# define SSL_PKEY_ECC            3 
# define SSL_PKEY_GOST01         4 
# define SSL_PKEY_GOST12_256     5 
# define SSL_PKEY_GOST12_512     6 
# define SSL_PKEY_ED25519        7 
# define SSL_PKEY_ED448          8 
# define SSL_PKEY_NUM            9 
 
/*- 
 * SSL_kRSA <- RSA_ENC 
 * SSL_kDH  <- DH_ENC & (RSA_ENC | RSA_SIGN | DSA_SIGN) 
 * SSL_kDHE <- RSA_ENC | RSA_SIGN | DSA_SIGN 
 * SSL_aRSA <- RSA_ENC | RSA_SIGN 
 * SSL_aDSS <- DSA_SIGN 
 */ 
 
/*- 
#define CERT_INVALID            0 
#define CERT_PUBLIC_KEY         1 
#define CERT_PRIVATE_KEY        2 
*/ 
 
/* Post-Handshake Authentication state */ 
typedef enum { 
    SSL_PHA_NONE = 0, 
    SSL_PHA_EXT_SENT,        /* client-side only: extension sent */ 
    SSL_PHA_EXT_RECEIVED,    /* server-side only: extension received */ 
    SSL_PHA_REQUEST_PENDING, /* server-side only: request pending */ 
    SSL_PHA_REQUESTED        /* request received by client, or sent by server */ 
} SSL_PHA_STATE; 
 
/* CipherSuite length. SSLv3 and all TLS versions. */ 
# define TLS_CIPHER_LEN 2 
/* used to hold info on the particular ciphers used */ 
struct ssl_cipher_st { 
    uint32_t valid; 
    const char *name;           /* text name */ 
    const char *stdname;        /* RFC name */ 
    uint32_t id;                /* id, 4 bytes, first is version */ 
    /* 
     * changed in 1.0.0: these four used to be portions of a single value 
     * 'algorithms' 
     */ 
    uint32_t algorithm_mkey;    /* key exchange algorithm */ 
    uint32_t algorithm_auth;    /* server authentication */ 
    uint32_t algorithm_enc;     /* symmetric encryption */ 
    uint32_t algorithm_mac;     /* symmetric authentication */ 
    int min_tls;                /* minimum SSL/TLS protocol version */ 
    int max_tls;                /* maximum SSL/TLS protocol version */ 
    int min_dtls;               /* minimum DTLS protocol version */ 
    int max_dtls;               /* maximum DTLS protocol version */ 
    uint32_t algo_strength;     /* strength and export flags */ 
    uint32_t algorithm2;        /* Extra flags */ 
    int32_t strength_bits;      /* Number of bits really used */ 
    uint32_t alg_bits;          /* Number of bits for algorithm */ 
}; 
 
/* Used to hold SSL/TLS functions */ 
struct ssl_method_st { 
    int version; 
    unsigned flags; 
    unsigned long mask; 
    int (*ssl_new) (SSL *s); 
    int (*ssl_clear) (SSL *s); 
    void (*ssl_free) (SSL *s); 
    int (*ssl_accept) (SSL *s); 
    int (*ssl_connect) (SSL *s); 
    int (*ssl_read) (SSL *s, void *buf, size_t len, size_t *readbytes); 
    int (*ssl_peek) (SSL *s, void *buf, size_t len, size_t *readbytes); 
    int (*ssl_write) (SSL *s, const void *buf, size_t len, size_t *written); 
    int (*ssl_shutdown) (SSL *s); 
    int (*ssl_renegotiate) (SSL *s); 
    int (*ssl_renegotiate_check) (SSL *s, int); 
    int (*ssl_read_bytes) (SSL *s, int type, int *recvd_type, 
                           unsigned char *buf, size_t len, int peek, 
                           size_t *readbytes); 
    int (*ssl_write_bytes) (SSL *s, int type, const void *buf_, size_t len, 
                            size_t *written); 
    int (*ssl_dispatch_alert) (SSL *s); 
    long (*ssl_ctrl) (SSL *s, int cmd, long larg, void *parg); 
    long (*ssl_ctx_ctrl) (SSL_CTX *ctx, int cmd, long larg, void *parg); 
    const SSL_CIPHER *(*get_cipher_by_char) (const unsigned char *ptr); 
    int (*put_cipher_by_char) (const SSL_CIPHER *cipher, WPACKET *pkt, 
                               size_t *len); 
    size_t (*ssl_pending) (const SSL *s); 
    int (*num_ciphers) (void); 
    const SSL_CIPHER *(*get_cipher) (unsigned ncipher); 
    long (*get_timeout) (void); 
    const struct ssl3_enc_method *ssl3_enc; /* Extra SSLv3/TLS stuff */ 
    int (*ssl_version) (void); 
    long (*ssl_callback_ctrl) (SSL *s, int cb_id, void (*fp) (void)); 
    long (*ssl_ctx_callback_ctrl) (SSL_CTX *s, int cb_id, void (*fp) (void)); 
}; 
 
/* 
 * Matches the length of PSK_MAX_PSK_LEN. We keep it the same value for 
 * consistency, even in the event of OPENSSL_NO_PSK being defined. 
 */ 
# define TLS13_MAX_RESUMPTION_PSK_LENGTH      256 
 
/*- 
 * Lets make this into an ASN.1 type structure as follows 
 * SSL_SESSION_ID ::= SEQUENCE { 
 *      version                 INTEGER,        -- structure version number 
 *      SSLversion              INTEGER,        -- SSL version number 
 *      Cipher                  OCTET STRING,   -- the 3 byte cipher ID 
 *      Session_ID              OCTET STRING,   -- the Session ID 
 *      Master_key              OCTET STRING,   -- the master key 
 *      Key_Arg [ 0 ] IMPLICIT  OCTET STRING,   -- the optional Key argument 
 *      Time [ 1 ] EXPLICIT     INTEGER,        -- optional Start Time 
 *      Timeout [ 2 ] EXPLICIT  INTEGER,        -- optional Timeout ins seconds 
 *      Peer [ 3 ] EXPLICIT     X509,           -- optional Peer Certificate 
 *      Session_ID_context [ 4 ] EXPLICIT OCTET STRING,   -- the Session ID context 
 *      Verify_result [ 5 ] EXPLICIT INTEGER,   -- X509_V_... code for `Peer' 
 *      HostName [ 6 ] EXPLICIT OCTET STRING,   -- optional HostName from servername TLS extension 
 *      PSK_identity_hint [ 7 ] EXPLICIT OCTET STRING, -- optional PSK identity hint 
 *      PSK_identity [ 8 ] EXPLICIT OCTET STRING,  -- optional PSK identity 
 *      Ticket_lifetime_hint [9] EXPLICIT INTEGER, -- server's lifetime hint for session ticket 
 *      Ticket [10]             EXPLICIT OCTET STRING, -- session ticket (clients only) 
 *      Compression_meth [11]   EXPLICIT OCTET STRING, -- optional compression method 
 *      SRP_username [ 12 ] EXPLICIT OCTET STRING -- optional SRP username 
 *      flags [ 13 ] EXPLICIT INTEGER -- optional flags 
 *      } 
 * Look in ssl/ssl_asn1.c for more details 
 * I'm using EXPLICIT tags so I can read the damn things using asn1parse :-). 
 */ 
struct ssl_session_st { 
    int ssl_version;            /* what ssl version session info is being kept 
                                 * in here? */ 
    size_t master_key_length; 
 
    /* TLSv1.3 early_secret used for external PSKs */ 
    unsigned char early_secret[EVP_MAX_MD_SIZE]; 
    /* 
     * For <=TLS1.2 this is the master_key. For TLS1.3 this is the resumption 
     * PSK 
     */ 
    unsigned char master_key[TLS13_MAX_RESUMPTION_PSK_LENGTH]; 
    /* session_id - valid? */ 
    size_t session_id_length; 
    unsigned char session_id[SSL_MAX_SSL_SESSION_ID_LENGTH]; 
    /* 
     * this is used to determine whether the session is being reused in the 
     * appropriate context. It is up to the application to set this, via 
     * SSL_new 
     */ 
    size_t sid_ctx_length; 
    unsigned char sid_ctx[SSL_MAX_SID_CTX_LENGTH]; 
# ifndef OPENSSL_NO_PSK 
    char *psk_identity_hint; 
    char *psk_identity; 
# endif 
    /* 
     * Used to indicate that session resumption is not allowed. Applications 
     * can also set this bit for a new session via not_resumable_session_cb 
     * to disable session caching and tickets. 
     */ 
    int not_resumable; 
    /* This is the cert and type for the other end. */ 
    X509 *peer; 
    /* Certificate chain peer sent. */ 
    STACK_OF(X509) *peer_chain; 
    /* 
     * when app_verify_callback accepts a session where the peer's 
     * certificate is not ok, we must remember the error for session reuse: 
     */ 
    long verify_result;         /* only for servers */ 
    CRYPTO_REF_COUNT references; 
    long timeout; 
    long time; 
    unsigned int compress_meth; /* Need to lookup the method */ 
    const SSL_CIPHER *cipher; 
    unsigned long cipher_id;    /* when ASN.1 loaded, this needs to be used to 
                                 * load the 'cipher' structure */ 
    CRYPTO_EX_DATA ex_data;     /* application specific data */ 
    /* 
     * These are used to make removal of session-ids more efficient and to 
     * implement a maximum cache size. 
     */ 
    struct ssl_session_st *prev, *next; 
 
    struct { 
        char *hostname; 
        /* RFC4507 info */ 
        unsigned char *tick; /* Session ticket */ 
        size_t ticklen;      /* Session ticket length */ 
        /* Session lifetime hint in seconds */ 
        unsigned long tick_lifetime_hint; 
        uint32_t tick_age_add; 
        /* Max number of bytes that can be sent as early data */ 
        uint32_t max_early_data; 
        /* The ALPN protocol selected for this session */ 
        unsigned char *alpn_selected; 
        size_t alpn_selected_len; 
        /* 
         * Maximum Fragment Length as per RFC 4366. 
         * If this value does not contain RFC 4366 allowed values (1-4) then 
         * either the Maximum Fragment Length Negotiation failed or was not 
         * performed at all. 
         */ 
        uint8_t max_fragment_len_mode; 
    } ext; 
# ifndef OPENSSL_NO_SRP 
    char *srp_username; 
# endif 
    unsigned char *ticket_appdata; 
    size_t ticket_appdata_len; 
    uint32_t flags; 
    CRYPTO_RWLOCK *lock; 
}; 
 
/* Extended master secret support */ 
# define SSL_SESS_FLAG_EXTMS             0x1 
 
# ifndef OPENSSL_NO_SRP 
 
typedef struct srp_ctx_st { 
    /* param for all the callbacks */ 
    void *SRP_cb_arg; 
    /* set client Hello login callback */ 
    int (*TLS_ext_srp_username_callback) (SSL *, int *, void *); 
    /* set SRP N/g param callback for verification */ 
    int (*SRP_verify_param_callback) (SSL *, void *); 
    /* set SRP client passwd callback */ 
    char *(*SRP_give_srp_client_pwd_callback) (SSL *, void *); 
    char *login; 
    BIGNUM *N, *g, *s, *B, *A; 
    BIGNUM *a, *b, *v; 
    char *info; 
    int strength; 
    unsigned long srp_Mask; 
} SRP_CTX; 
 
# endif 
 
typedef enum { 
    SSL_EARLY_DATA_NONE = 0, 
    SSL_EARLY_DATA_CONNECT_RETRY, 
    SSL_EARLY_DATA_CONNECTING, 
    SSL_EARLY_DATA_WRITE_RETRY, 
    SSL_EARLY_DATA_WRITING, 
    SSL_EARLY_DATA_WRITE_FLUSH, 
    SSL_EARLY_DATA_UNAUTH_WRITING, 
    SSL_EARLY_DATA_FINISHED_WRITING, 
    SSL_EARLY_DATA_ACCEPT_RETRY, 
    SSL_EARLY_DATA_ACCEPTING, 
    SSL_EARLY_DATA_READ_RETRY, 
    SSL_EARLY_DATA_READING, 
    SSL_EARLY_DATA_FINISHED_READING 
} SSL_EARLY_DATA_STATE; 
 
/* 
 * We check that the amount of unreadable early data doesn't exceed 
 * max_early_data. max_early_data is given in plaintext bytes. However if it is 
 * unreadable then we only know the number of ciphertext bytes. We also don't 
 * know how much the overhead should be because it depends on the ciphersuite. 
 * We make a small allowance. We assume 5 records of actual data plus the end 
 * of early data alert record. Each record has a tag and a content type byte. 
 * The longest tag length we know of is EVP_GCM_TLS_TAG_LEN. We don't count the 
 * content of the alert record either which is 2 bytes. 
 */ 
# define EARLY_DATA_CIPHERTEXT_OVERHEAD ((6 * (EVP_GCM_TLS_TAG_LEN + 1)) + 2) 
 
/* 
 * The allowance we have between the client's calculated ticket age and our own. 
 * We allow for 10 seconds (units are in ms). If a ticket is presented and the 
 * client's age calculation is different by more than this than our own then we 
 * do not allow that ticket for early_data. 
 */ 
# define TICKET_AGE_ALLOWANCE   (10 * 1000) 
 
#define MAX_COMPRESSIONS_SIZE   255 
 
struct ssl_comp_st { 
    int id; 
    const char *name; 
    COMP_METHOD *method; 
}; 
 
typedef struct raw_extension_st { 
    /* Raw packet data for the extension */ 
    PACKET data; 
    /* Set to 1 if the extension is present or 0 otherwise */ 
    int present; 
    /* Set to 1 if we have already parsed the extension or 0 otherwise */ 
    int parsed; 
    /* The type of this extension, i.e. a TLSEXT_TYPE_* value */ 
    unsigned int type; 
    /* Track what order extensions are received in (0-based). */ 
    size_t received_order; 
} RAW_EXTENSION; 
 
typedef struct { 
    unsigned int isv2; 
    unsigned int legacy_version; 
    unsigned char random[SSL3_RANDOM_SIZE]; 
    size_t session_id_len; 
    unsigned char session_id[SSL_MAX_SSL_SESSION_ID_LENGTH]; 
    size_t dtls_cookie_len; 
    unsigned char dtls_cookie[DTLS1_COOKIE_LENGTH]; 
    PACKET ciphersuites; 
    size_t compressions_len; 
    unsigned char compressions[MAX_COMPRESSIONS_SIZE]; 
    PACKET extensions; 
    size_t pre_proc_exts_len; 
    RAW_EXTENSION *pre_proc_exts; 
} CLIENTHELLO_MSG; 
 
/* 
 * Extension index values NOTE: Any updates to these defines should be mirrored 
 * with equivalent updates to ext_defs in extensions.c 
 */ 
typedef enum tlsext_index_en { 
    TLSEXT_IDX_renegotiate, 
    TLSEXT_IDX_server_name, 
    TLSEXT_IDX_max_fragment_length, 
    TLSEXT_IDX_srp, 
    TLSEXT_IDX_ec_point_formats, 
    TLSEXT_IDX_supported_groups, 
    TLSEXT_IDX_session_ticket, 
    TLSEXT_IDX_status_request, 
    TLSEXT_IDX_next_proto_neg, 
    TLSEXT_IDX_application_layer_protocol_negotiation, 
    TLSEXT_IDX_use_srtp, 
    TLSEXT_IDX_encrypt_then_mac, 
    TLSEXT_IDX_signed_certificate_timestamp, 
    TLSEXT_IDX_extended_master_secret, 
    TLSEXT_IDX_signature_algorithms_cert, 
    TLSEXT_IDX_post_handshake_auth, 
    TLSEXT_IDX_signature_algorithms, 
    TLSEXT_IDX_supported_versions, 
    TLSEXT_IDX_psk_kex_modes, 
    TLSEXT_IDX_key_share, 
    TLSEXT_IDX_cookie, 
    TLSEXT_IDX_cryptopro_bug, 
    TLSEXT_IDX_early_data, 
    TLSEXT_IDX_certificate_authorities, 
    TLSEXT_IDX_padding, 
    TLSEXT_IDX_psk, 
    /* Dummy index - must always be the last entry */ 
    TLSEXT_IDX_num_builtins 
} TLSEXT_INDEX; 
 
DEFINE_LHASH_OF(SSL_SESSION); 
/* Needed in ssl_cert.c */ 
DEFINE_LHASH_OF(X509_NAME); 
 
# define TLSEXT_KEYNAME_LENGTH  16 
# define TLSEXT_TICK_KEY_LENGTH 32 
 
typedef struct ssl_ctx_ext_secure_st { 
    unsigned char tick_hmac_key[TLSEXT_TICK_KEY_LENGTH]; 
    unsigned char tick_aes_key[TLSEXT_TICK_KEY_LENGTH]; 
} SSL_CTX_EXT_SECURE; 
 
struct ssl_ctx_st { 
    const SSL_METHOD *method; 
    STACK_OF(SSL_CIPHER) *cipher_list; 
    /* same as above but sorted for lookup */ 
    STACK_OF(SSL_CIPHER) *cipher_list_by_id; 
    /* TLSv1.3 specific ciphersuites */ 
    STACK_OF(SSL_CIPHER) *tls13_ciphersuites; 
    struct x509_store_st /* X509_STORE */ *cert_store; 
    LHASH_OF(SSL_SESSION) *sessions; 
    /* 
     * Most session-ids that will be cached, default is 
     * SSL_SESSION_CACHE_MAX_SIZE_DEFAULT. 0 is unlimited. 
     */ 
    size_t session_cache_size; 
    struct ssl_session_st *session_cache_head; 
    struct ssl_session_st *session_cache_tail; 
    /* 
     * This can have one of 2 values, ored together, SSL_SESS_CACHE_CLIENT, 
     * SSL_SESS_CACHE_SERVER, Default is SSL_SESSION_CACHE_SERVER, which 
     * means only SSL_accept will cache SSL_SESSIONS. 
     */ 
    uint32_t session_cache_mode; 
    /* 
     * If timeout is not 0, it is the default timeout value set when 
     * SSL_new() is called.  This has been put in to make life easier to set 
     * things up 
     */ 
    long session_timeout; 
    /* 
     * If this callback is not null, it will be called each time a session id 
     * is added to the cache.  If this function returns 1, it means that the 
     * callback will do a SSL_SESSION_free() when it has finished using it. 
     * Otherwise, on 0, it means the callback has finished with it. If 
     * remove_session_cb is not null, it will be called when a session-id is 
     * removed from the cache.  After the call, OpenSSL will 
     * SSL_SESSION_free() it. 
     */ 
    int (*new_session_cb) (struct ssl_st *ssl, SSL_SESSION *sess); 
    void (*remove_session_cb) (struct ssl_ctx_st *ctx, SSL_SESSION *sess); 
    SSL_SESSION *(*get_session_cb) (struct ssl_st *ssl, 
                                    const unsigned char *data, int len, 
                                    int *copy); 
    struct { 
        TSAN_QUALIFIER int sess_connect;       /* SSL new conn - started */ 
        TSAN_QUALIFIER int sess_connect_renegotiate; /* SSL reneg - requested */ 
        TSAN_QUALIFIER int sess_connect_good;  /* SSL new conne/reneg - finished */ 
        TSAN_QUALIFIER int sess_accept;        /* SSL new accept - started */ 
        TSAN_QUALIFIER int sess_accept_renegotiate; /* SSL reneg - requested */ 
        TSAN_QUALIFIER int sess_accept_good;   /* SSL accept/reneg - finished */ 
        TSAN_QUALIFIER int sess_miss;          /* session lookup misses */ 
        TSAN_QUALIFIER int sess_timeout;       /* reuse attempt on timeouted session */ 
        TSAN_QUALIFIER int sess_cache_full;    /* session removed due to full cache */ 
        TSAN_QUALIFIER int sess_hit;           /* session reuse actually done */ 
        TSAN_QUALIFIER int sess_cb_hit;        /* session-id that was not in 
                                                * the cache was passed back via 
                                                * the callback. This indicates 
                                                * that the application is 
                                                * supplying session-id's from 
                                                * other processes - spooky 
                                                * :-) */ 
    } stats; 
 
    CRYPTO_REF_COUNT references; 
 
    /* if defined, these override the X509_verify_cert() calls */ 
    int (*app_verify_callback) (X509_STORE_CTX *, void *); 
    void *app_verify_arg; 
    /* 
     * before OpenSSL 0.9.7, 'app_verify_arg' was ignored 
     * ('app_verify_callback' was called with just one argument) 
     */ 
 
    /* Default password callback. */ 
    pem_password_cb *default_passwd_callback; 
 
    /* Default password callback user data. */ 
    void *default_passwd_callback_userdata; 
 
    /* get client cert callback */ 
    int (*client_cert_cb) (SSL *ssl, X509 **x509, EVP_PKEY **pkey); 
 
    /* cookie generate callback */ 
    int (*app_gen_cookie_cb) (SSL *ssl, unsigned char *cookie, 
                              unsigned int *cookie_len); 
 
    /* verify cookie callback */ 
    int (*app_verify_cookie_cb) (SSL *ssl, const unsigned char *cookie, 
                                 unsigned int cookie_len); 
 
    /* TLS1.3 app-controlled cookie generate callback */ 
    int (*gen_stateless_cookie_cb) (SSL *ssl, unsigned char *cookie, 
                                    size_t *cookie_len); 
 
    /* TLS1.3 verify app-controlled cookie callback */ 
    int (*verify_stateless_cookie_cb) (SSL *ssl, const unsigned char *cookie, 
                                       size_t cookie_len); 
 
    CRYPTO_EX_DATA ex_data; 
 
    const EVP_MD *md5;          /* For SSLv3/TLSv1 'ssl3-md5' */ 
    const EVP_MD *sha1;         /* For SSLv3/TLSv1 'ssl3->sha1' */ 
 
    STACK_OF(X509) *extra_certs; 
    STACK_OF(SSL_COMP) *comp_methods; /* stack of SSL_COMP, SSLv3/TLSv1 */ 
 
    /* Default values used when no per-SSL value is defined follow */ 
 
    /* used if SSL's info_callback is NULL */ 
    void (*info_callback) (const SSL *ssl, int type, int val); 
 
    /* 
     * What we put in certificate_authorities extension for TLS 1.3 
     * (ClientHello and CertificateRequest) or just client cert requests for 
     * earlier versions. If client_ca_names is populated then it is only used 
     * for client cert requests, and in preference to ca_names. 
     */ 
    STACK_OF(X509_NAME) *ca_names; 
    STACK_OF(X509_NAME) *client_ca_names; 
 
    /* 
     * Default values to use in SSL structures follow (these are copied by 
     * SSL_new) 
     */ 
 
    uint32_t options; 
    uint32_t mode; 
    int min_proto_version; 
    int max_proto_version; 
    size_t max_cert_list; 
 
    struct cert_st /* CERT */ *cert; 
    int read_ahead; 
 
    /* callback that allows applications to peek at protocol messages */ 
    void (*msg_callback) (int write_p, int version, int content_type, 
                          const void *buf, size_t len, SSL *ssl, void *arg); 
    void *msg_callback_arg; 
 
    uint32_t verify_mode; 
    size_t sid_ctx_length; 
    unsigned char sid_ctx[SSL_MAX_SID_CTX_LENGTH]; 
    /* called 'verify_callback' in the SSL */ 
    int (*default_verify_callback) (int ok, X509_STORE_CTX *ctx); 
 
    /* Default generate session ID callback. */ 
    GEN_SESSION_CB generate_session_id; 
 
    X509_VERIFY_PARAM *param; 
 
    int quiet_shutdown; 
 
# ifndef OPENSSL_NO_CT 
    CTLOG_STORE *ctlog_store;   /* CT Log Store */ 
    /* 
     * Validates that the SCTs (Signed Certificate Timestamps) are sufficient. 
     * If they are not, the connection should be aborted. 
     */ 
    ssl_ct_validation_cb ct_validation_callback; 
    void *ct_validation_callback_arg; 
# endif 
 
    /* 
     * If we're using more than one pipeline how should we divide the data 
     * up between the pipes? 
     */ 
    size_t split_send_fragment; 
    /* 
     * Maximum amount of data to send in one fragment. actual record size can 
     * be more than this due to padding and MAC overheads. 
     */ 
    size_t max_send_fragment; 
 
    /* Up to how many pipelines should we use? If 0 then 1 is assumed */ 
    size_t max_pipelines; 
 
    /* The default read buffer length to use (0 means not set) */ 
    size_t default_read_buf_len; 
 
# ifndef OPENSSL_NO_ENGINE 
    /* 
     * Engine to pass requests for client certs to 
     */ 
    ENGINE *client_cert_engine; 
# endif 
 
    /* ClientHello callback.  Mostly for extensions, but not entirely. */ 
    SSL_client_hello_cb_fn client_hello_cb; 
    void *client_hello_cb_arg; 
 
    /* TLS extensions. */ 
    struct { 
        /* TLS extensions servername callback */ 
        int (*servername_cb) (SSL *, int *, void *); 
        void *servername_arg; 
        /* RFC 4507 session ticket keys */ 
        unsigned char tick_key_name[TLSEXT_KEYNAME_LENGTH]; 
        SSL_CTX_EXT_SECURE *secure; 
        /* Callback to support customisation of ticket key setting */ 
        int (*ticket_key_cb) (SSL *ssl, 
                              unsigned char *name, unsigned char *iv, 
                              EVP_CIPHER_CTX *ectx, HMAC_CTX *hctx, int enc); 
 
        /* certificate status request info */ 
        /* Callback for status request */ 
        int (*status_cb) (SSL *ssl, void *arg); 
        void *status_arg; 
        /* ext status type used for CSR extension (OCSP Stapling) */ 
        int status_type; 
        /* RFC 4366 Maximum Fragment Length Negotiation */ 
        uint8_t max_fragment_len_mode; 
 
# ifndef OPENSSL_NO_EC 
        /* EC extension values inherited by SSL structure */ 
        size_t ecpointformats_len; 
        unsigned char *ecpointformats; 
        size_t supportedgroups_len; 
        uint16_t *supportedgroups; 
# endif                         /* OPENSSL_NO_EC */ 
 
        /* 
         * ALPN information (we are in the process of transitioning from NPN to 
         * ALPN.) 
         */ 
 
        /*- 
         * For a server, this contains a callback function that allows the 
         * server to select the protocol for the connection. 
         *   out: on successful return, this must point to the raw protocol 
         *        name (without the length prefix). 
         *   outlen: on successful return, this contains the length of |*out|. 
         *   in: points to the client's list of supported protocols in 
         *       wire-format. 
         *   inlen: the length of |in|. 
         */ 
        int (*alpn_select_cb) (SSL *s, 
                               const unsigned char **out, 
                               unsigned char *outlen, 
                               const unsigned char *in, 
                               unsigned int inlen, void *arg); 
        void *alpn_select_cb_arg; 
 
        /* 
         * For a client, this contains the list of supported protocols in wire 
         * format. 
         */ 
        unsigned char *alpn; 
        size_t alpn_len; 
 
# ifndef OPENSSL_NO_NEXTPROTONEG 
        /* Next protocol negotiation information */ 
 
        /* 
         * For a server, this contains a callback function by which the set of 
         * advertised protocols can be provided. 
         */ 
        SSL_CTX_npn_advertised_cb_func npn_advertised_cb; 
        void *npn_advertised_cb_arg; 
        /* 
         * For a client, this contains a callback function that selects the next 
         * protocol from the list provided by the server. 
         */ 
        SSL_CTX_npn_select_cb_func npn_select_cb; 
        void *npn_select_cb_arg; 
# endif 
 
        unsigned char cookie_hmac_key[SHA256_DIGEST_LENGTH]; 
    } ext; 
 
# ifndef OPENSSL_NO_PSK 
    SSL_psk_client_cb_func psk_client_callback; 
    SSL_psk_server_cb_func psk_server_callback; 
# endif 
    SSL_psk_find_session_cb_func psk_find_session_cb; 
    SSL_psk_use_session_cb_func psk_use_session_cb; 
 
# ifndef OPENSSL_NO_SRP 
    SRP_CTX srp_ctx;            /* ctx for SRP authentication */ 
# endif 
 
    /* Shared DANE context */ 
    struct dane_ctx_st dane; 
 
# ifndef OPENSSL_NO_SRTP 
    /* SRTP profiles we are willing to do from RFC 5764 */ 
    STACK_OF(SRTP_PROTECTION_PROFILE) *srtp_profiles; 
# endif 
    /* 
     * Callback for disabling session caching and ticket support on a session 
     * basis, depending on the chosen cipher. 
     */ 
    int (*not_resumable_session_cb) (SSL *ssl, int is_forward_secure); 
 
    CRYPTO_RWLOCK *lock; 
 
    /* 
     * Callback for logging key material for use with debugging tools like 
     * Wireshark. The callback should log `line` followed by a newline. 
     */ 
    SSL_CTX_keylog_cb_func keylog_callback; 
 
    /* 
     * The maximum number of bytes advertised in session tickets that can be 
     * sent as early data. 
     */ 
    uint32_t max_early_data; 
 
    /* 
     * The maximum number of bytes of early data that a server will tolerate 
     * (which should be at least as much as max_early_data). 
     */ 
    uint32_t recv_max_early_data; 
 
    /* TLS1.3 padding callback */ 
    size_t (*record_padding_cb)(SSL *s, int type, size_t len, void *arg); 
    void *record_padding_arg; 
    size_t block_padding; 
 
    /* Session ticket appdata */ 
    SSL_CTX_generate_session_ticket_fn generate_ticket_cb; 
    SSL_CTX_decrypt_session_ticket_fn decrypt_ticket_cb; 
    void *ticket_cb_data; 
 
    /* The number of TLS1.3 tickets to automatically send */ 
    size_t num_tickets; 
 
    /* Callback to determine if early_data is acceptable or not */ 
    SSL_allow_early_data_cb_fn allow_early_data_cb; 
    void *allow_early_data_cb_data; 
 
    /* Do we advertise Post-handshake auth support? */ 
    int pha_enabled; 
}; 
 
struct ssl_st { 
    /* 
     * protocol version (one of SSL2_VERSION, SSL3_VERSION, TLS1_VERSION, 
     * DTLS1_VERSION) 
     */ 
    int version; 
    /* SSLv3 */ 
    const SSL_METHOD *method; 
    /* 
     * There are 2 BIO's even though they are normally both the same.  This 
     * is so data can be read and written to different handlers 
     */ 
    /* used by SSL_read */ 
    BIO *rbio; 
    /* used by SSL_write */ 
    BIO *wbio; 
    /* used during session-id reuse to concatenate messages */ 
    BIO *bbio; 
    /* 
     * This holds a variable that indicates what we were doing when a 0 or -1 
     * is returned.  This is needed for non-blocking IO so we know what 
     * request needs re-doing when in SSL_accept or SSL_connect 
     */ 
    int rwstate; 
    int (*handshake_func) (SSL *); 
    /* 
     * Imagine that here's a boolean member "init" that is switched as soon 
     * as SSL_set_{accept/connect}_state is called for the first time, so 
     * that "state" and "handshake_func" are properly initialized.  But as 
     * handshake_func is == 0 until then, we use this test instead of an 
     * "init" member. 
     */ 
    /* are we the server side? */ 
    int server; 
    /* 
     * Generate a new session or reuse an old one. 
     * NB: For servers, the 'new' session may actually be a previously 
     * cached session or even the previous session unless 
     * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set 
     */ 
    int new_session; 
    /* don't send shutdown packets */ 
    int quiet_shutdown; 
    /* we have shut things down, 0x01 sent, 0x02 for received */ 
    int shutdown; 
    /* where we are */ 
    OSSL_STATEM statem; 
    SSL_EARLY_DATA_STATE early_data_state; 
    BUF_MEM *init_buf;          /* buffer used during init */ 
    void *init_msg;             /* pointer to handshake message body, set by 
                                 * ssl3_get_message() */ 
    size_t init_num;               /* amount read/written */ 
    size_t init_off;               /* amount read/written */ 
    struct ssl3_state_st *s3;   /* SSLv3 variables */ 
    struct dtls1_state_st *d1;  /* DTLSv1 variables */ 
    /* callback that allows applications to peek at protocol messages */ 
    void (*msg_callback) (int write_p, int version, int content_type, 
                          const void *buf, size_t len, SSL *ssl, void *arg); 
    void *msg_callback_arg; 
    int hit;                    /* reusing a previous session */ 
    X509_VERIFY_PARAM *param; 
    /* Per connection DANE state */ 
    SSL_DANE dane; 
    /* crypto */ 
    STACK_OF(SSL_CIPHER) *peer_ciphers; 
    STACK_OF(SSL_CIPHER) *cipher_list; 
    STACK_OF(SSL_CIPHER) *cipher_list_by_id; 
    /* TLSv1.3 specific ciphersuites */ 
    STACK_OF(SSL_CIPHER) *tls13_ciphersuites; 
    /* 
     * These are the ones being used, the ones in SSL_SESSION are the ones to 
     * be 'copied' into these ones 
     */ 
    uint32_t mac_flags; 
    /* 
     * The TLS1.3 secrets. 
     */ 
    unsigned char early_secret[EVP_MAX_MD_SIZE]; 
    unsigned char handshake_secret[EVP_MAX_MD_SIZE]; 
    unsigned char master_secret[EVP_MAX_MD_SIZE]; 
    unsigned char resumption_master_secret[EVP_MAX_MD_SIZE]; 
    unsigned char client_finished_secret[EVP_MAX_MD_SIZE]; 
    unsigned char server_finished_secret[EVP_MAX_MD_SIZE]; 
    unsigned char server_finished_hash[EVP_MAX_MD_SIZE]; 
    unsigned char handshake_traffic_hash[EVP_MAX_MD_SIZE]; 
    unsigned char client_app_traffic_secret[EVP_MAX_MD_SIZE]; 
    unsigned char server_app_traffic_secret[EVP_MAX_MD_SIZE]; 
    unsigned char exporter_master_secret[EVP_MAX_MD_SIZE]; 
    unsigned char early_exporter_master_secret[EVP_MAX_MD_SIZE]; 
    EVP_CIPHER_CTX *enc_read_ctx; /* cryptographic state */ 
    unsigned char read_iv[EVP_MAX_IV_LENGTH]; /* TLSv1.3 static read IV */ 
    EVP_MD_CTX *read_hash;      /* used for mac generation */ 
    COMP_CTX *compress;         /* compression */ 
    COMP_CTX *expand;           /* uncompress */ 
    EVP_CIPHER_CTX *enc_write_ctx; /* cryptographic state */ 
    unsigned char write_iv[EVP_MAX_IV_LENGTH]; /* TLSv1.3 static write IV */ 
    EVP_MD_CTX *write_hash;     /* used for mac generation */ 
    /* session info */ 
    /* client cert? */ 
    /* This is used to hold the server certificate used */ 
    struct cert_st /* CERT */ *cert; 
 
    /* 
     * The hash of all messages prior to the CertificateVerify, and the length 
     * of that hash. 
     */ 
    unsigned char cert_verify_hash[EVP_MAX_MD_SIZE]; 
    size_t cert_verify_hash_len; 
 
    /* Flag to indicate whether we should send a HelloRetryRequest or not */ 
    enum {SSL_HRR_NONE = 0, SSL_HRR_PENDING, SSL_HRR_COMPLETE} 
        hello_retry_request; 
 
    /* 
     * the session_id_context is used to ensure sessions are only reused in 
     * the appropriate context 
     */ 
    size_t sid_ctx_length; 
    unsigned char sid_ctx[SSL_MAX_SID_CTX_LENGTH]; 
    /* This can also be in the session once a session is established */ 
    SSL_SESSION *session; 
    /* TLSv1.3 PSK session */ 
    SSL_SESSION *psksession; 
    unsigned char *psksession_id; 
    size_t psksession_id_len; 
    /* Default generate session ID callback. */ 
    GEN_SESSION_CB generate_session_id; 
    /* 
     * The temporary TLSv1.3 session id. This isn't really a session id at all 
     * but is a random value sent in the legacy session id field. 
     */ 
    unsigned char tmp_session_id[SSL_MAX_SSL_SESSION_ID_LENGTH]; 
    size_t tmp_session_id_len; 
    /* Used in SSL3 */ 
    /* 
     * 0 don't care about verify failure. 
     * 1 fail if verify fails 
     */ 
    uint32_t verify_mode; 
    /* fail if callback returns 0 */ 
    int (*verify_callback) (int ok, X509_STORE_CTX *ctx); 
    /* optional informational callback */ 
    void (*info_callback) (const SSL *ssl, int type, int val); 
    /* error bytes to be written */ 
    int error; 
    /* actual code */ 
    int error_code; 
# ifndef OPENSSL_NO_PSK 
    SSL_psk_client_cb_func psk_client_callback; 
    SSL_psk_server_cb_func psk_server_callback; 
# endif 
    SSL_psk_find_session_cb_func psk_find_session_cb; 
    SSL_psk_use_session_cb_func psk_use_session_cb; 
 
    SSL_CTX *ctx; 
    /* Verified chain of peer */ 
    STACK_OF(X509) *verified_chain; 
    long verify_result; 
    /* extra application data */ 
    CRYPTO_EX_DATA ex_data; 
    /* 
     * What we put in certificate_authorities extension for TLS 1.3 
     * (ClientHello and CertificateRequest) or just client cert requests for 
     * earlier versions. If client_ca_names is populated then it is only used 
     * for client cert requests, and in preference to ca_names. 
     */ 
    STACK_OF(X509_NAME) *ca_names; 
    STACK_OF(X509_NAME) *client_ca_names; 
    CRYPTO_REF_COUNT references; 
    /* protocol behaviour */ 
    uint32_t options; 
    /* API behaviour */ 
    uint32_t mode; 
    int min_proto_version; 
    int max_proto_version; 
    size_t max_cert_list; 
    int first_packet; 
    /* 
     * What was passed in ClientHello.legacy_version. Used for RSA pre-master 
     * secret and SSLv3/TLS (<=1.2) rollback check 
     */ 
    int client_version; 
    /* 
     * If we're using more than one pipeline how should we divide the data 
     * up between the pipes? 
     */ 
    size_t split_send_fragment; 
    /* 
     * Maximum amount of data to send in one fragment. actual record size can 
     * be more than this due to padding and MAC overheads. 
     */ 
    size_t max_send_fragment; 
    /* Up to how many pipelines should we use? If 0 then 1 is assumed */ 
    size_t max_pipelines; 
 
    struct { 
        /* Built-in extension flags */ 
        uint8_t extflags[TLSEXT_IDX_num_builtins]; 
        /* TLS extension debug callback */ 
        void (*debug_cb)(SSL *s, int client_server, int type, 
                         const unsigned char *data, int len, void *arg); 
        void *debug_arg; 
        char *hostname; 
        /* certificate status request info */ 
        /* Status type or -1 if no status type */ 
        int status_type; 
        /* Raw extension data, if seen */ 
        unsigned char *scts; 
        /* Length of raw extension data, if seen */ 
        uint16_t scts_len; 
        /* Expect OCSP CertificateStatus message */ 
        int status_expected; 
 
        struct { 
            /* OCSP status request only */ 
            STACK_OF(OCSP_RESPID) *ids; 
            X509_EXTENSIONS *exts; 
            /* OCSP response received or to be sent */ 
            unsigned char *resp; 
            size_t resp_len; 
        } ocsp; 
 
        /* RFC4507 session ticket expected to be received or sent */ 
        int ticket_expected; 
# ifndef OPENSSL_NO_EC 
        size_t ecpointformats_len; 
        /* our list */ 
        unsigned char *ecpointformats; 
 
        size_t peer_ecpointformats_len; 
        /* peer's list */ 
        unsigned char *peer_ecpointformats; 
# endif                         /* OPENSSL_NO_EC */ 
        size_t supportedgroups_len; 
        /* our list */ 
        uint16_t *supportedgroups; 
 
        size_t peer_supportedgroups_len; 
         /* peer's list */ 
        uint16_t *peer_supportedgroups; 
 
        /* TLS Session Ticket extension override */ 
        TLS_SESSION_TICKET_EXT *session_ticket; 
        /* TLS Session Ticket extension callback */ 
        tls_session_ticket_ext_cb_fn session_ticket_cb; 
        void *session_ticket_cb_arg; 
        /* TLS pre-shared secret session resumption */ 
        tls_session_secret_cb_fn session_secret_cb; 
        void *session_secret_cb_arg; 
        /* 
         * For a client, this contains the list of supported protocols in wire 
         * format. 
         */ 
        unsigned char *alpn; 
        size_t alpn_len; 
        /* 
         * Next protocol negotiation. For the client, this is the protocol that 
         * we sent in NextProtocol and is set when handling ServerHello 
         * extensions. For a server, this is the client's selected_protocol from 
         * NextProtocol and is set when handling the NextProtocol message, before 
         * the Finished message. 
         */ 
        unsigned char *npn; 
        size_t npn_len; 
 
        /* The available PSK key exchange modes */ 
        int psk_kex_mode; 
 
        /* Set to one if we have negotiated ETM */ 
        int use_etm; 
 
        /* Are we expecting to receive early data? */ 
        int early_data; 
        /* Is the session suitable for early data? */ 
        int early_data_ok; 
 
        /* May be sent by a server in HRR. Must be echoed back in ClientHello */ 
        unsigned char *tls13_cookie; 
        size_t tls13_cookie_len; 
        /* Have we received a cookie from the client? */ 
        int cookieok; 
 
        /* 
         * Maximum Fragment Length as per RFC 4366. 
         * If this member contains one of the allowed values (1-4) 
         * then we should include Maximum Fragment Length Negotiation 
         * extension in Client Hello. 
         * Please note that value of this member does not have direct 
         * effect. The actual (binding) value is stored in SSL_SESSION, 
         * as this extension is optional on server side. 
         */ 
        uint8_t max_fragment_len_mode; 
 
        /* 
         * On the client side the number of ticket identities we sent in the 
         * ClientHello. On the server side the identity of the ticket we 
         * selected. 
         */ 
        int tick_identity; 
    } ext; 
 
    /* 
     * Parsed form of the ClientHello, kept around across client_hello_cb 
     * calls. 
     */ 
    CLIENTHELLO_MSG *clienthello; 
 
    /*- 
     * no further mod of servername 
     * 0 : call the servername extension callback. 
     * 1 : prepare 2, allow last ack just after in server callback. 
     * 2 : don't call servername callback, no ack in server hello 
     */ 
    int servername_done; 
# ifndef OPENSSL_NO_CT 
    /* 
     * Validates that the SCTs (Signed Certificate Timestamps) are sufficient. 
     * If they are not, the connection should be aborted. 
     */ 
    ssl_ct_validation_cb ct_validation_callback; 
    /* User-supplied argument that is passed to the ct_validation_callback */ 
    void *ct_validation_callback_arg; 
    /* 
     * Consolidated stack of SCTs from all sources. 
     * Lazily populated by CT_get_peer_scts(SSL*) 
     */ 
    STACK_OF(SCT) *scts; 
    /* Have we attempted to find/parse SCTs yet? */ 
    int scts_parsed; 
# endif 
    SSL_CTX *session_ctx;       /* initial ctx, used to store sessions */ 
# ifndef OPENSSL_NO_SRTP 
    /* What we'll do */ 
    STACK_OF(SRTP_PROTECTION_PROFILE) *srtp_profiles; 
    /* What's been chosen */ 
    SRTP_PROTECTION_PROFILE *srtp_profile; 
# endif 
    /*- 
     * 1 if we are renegotiating. 
     * 2 if we are a server and are inside a handshake 
     * (i.e. not just sending a HelloRequest) 
     */ 
    int renegotiate; 
    /* If sending a KeyUpdate is pending */ 
    int key_update; 
    /* Post-handshake authentication state */ 
    SSL_PHA_STATE post_handshake_auth; 
    int pha_enabled; 
    uint8_t* pha_context; 
    size_t pha_context_len; 
    int certreqs_sent; 
    EVP_MD_CTX *pha_dgst; /* this is just the digest through ClientFinished */ 
 
# ifndef OPENSSL_NO_SRP 
    /* ctx for SRP authentication */ 
    SRP_CTX srp_ctx; 
# endif 
    /* 
     * Callback for disabling session caching and ticket support on a session 
     * basis, depending on the chosen cipher. 
     */ 
    int (*not_resumable_session_cb) (SSL *ssl, int is_forward_secure); 
    RECORD_LAYER rlayer; 
    /* Default password callback. */ 
    pem_password_cb *default_passwd_callback; 
    /* Default password callback user data. */ 
    void *default_passwd_callback_userdata; 
    /* Async Job info */ 
    ASYNC_JOB *job; 
    ASYNC_WAIT_CTX *waitctx; 
    size_t asyncrw; 
 
    /* 
     * The maximum number of bytes advertised in session tickets that can be 
     * sent as early data. 
     */ 
    uint32_t max_early_data; 
    /* 
     * The maximum number of bytes of early data that a server will tolerate 
     * (which should be at least as much as max_early_data). 
     */ 
    uint32_t recv_max_early_data; 
 
    /* 
     * The number of bytes of early data received so far. If we accepted early 
     * data then this is a count of the plaintext bytes. If we rejected it then 
     * this is a count of the ciphertext bytes. 
     */ 
    uint32_t early_data_count; 
 
    /* TLS1.3 padding callback */ 
    size_t (*record_padding_cb)(SSL *s, int type, size_t len, void *arg); 
    void *record_padding_arg; 
    size_t block_padding; 
 
    CRYPTO_RWLOCK *lock; 
 
    /* The number of TLS1.3 tickets to automatically send */ 
    size_t num_tickets; 
    /* The number of TLS1.3 tickets actually sent so far */ 
    size_t sent_tickets; 
    /* The next nonce value to use when we send a ticket on this connection */ 
    uint64_t next_ticket_nonce; 
 
    /* Callback to determine if early_data is acceptable or not */ 
    SSL_allow_early_data_cb_fn allow_early_data_cb; 
    void *allow_early_data_cb_data; 
 
    /* 
     * Signature algorithms shared by client and server: cached because these 
     * are used most often. 
     */ 
    const struct sigalg_lookup_st **shared_sigalgs; 
    size_t shared_sigalgslen; 
}; 
 
/* 
 * Structure containing table entry of values associated with the signature 
 * algorithms (signature scheme) extension 
*/ 
typedef struct sigalg_lookup_st { 
    /* TLS 1.3 signature scheme name */ 
    const char *name; 
    /* Raw value used in extension */ 
    uint16_t sigalg; 
    /* NID of hash algorithm or NID_undef if no hash */ 
    int hash; 
    /* Index of hash algorithm or -1 if no hash algorithm */ 
    int hash_idx; 
    /* NID of signature algorithm */ 
    int sig; 
    /* Index of signature algorithm */ 
    int sig_idx; 
    /* Combined hash and signature NID, if any */ 
    int sigandhash; 
    /* Required public key curve (ECDSA only) */ 
    int curve; 
} SIGALG_LOOKUP; 
 
typedef struct tls_group_info_st { 
    int nid;                    /* Curve NID */ 
    int secbits;                /* Bits of security (from SP800-57) */ 
    uint16_t flags;             /* Flags: currently just group type */ 
} TLS_GROUP_INFO; 
 
/* flags values */ 
# define TLS_CURVE_TYPE          0x3 /* Mask for group type */ 
# define TLS_CURVE_PRIME         0x0 
# define TLS_CURVE_CHAR2         0x1 
# define TLS_CURVE_CUSTOM        0x2 
 
typedef struct cert_pkey_st CERT_PKEY; 
 
/* 
 * Structure containing table entry of certificate info corresponding to 
 * CERT_PKEY entries 
 */ 
typedef struct { 
    int nid; /* NID of public key algorithm */ 
    uint32_t amask; /* authmask corresponding to key type */ 
} SSL_CERT_LOOKUP; 
 
typedef struct ssl3_state_st { 
    long flags; 
    size_t read_mac_secret_size; 
    unsigned char read_mac_secret[EVP_MAX_MD_SIZE]; 
    size_t 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; 
    /* used during startup, digest all incoming/outgoing packets */ 
    BIO *handshake_buffer; 
    /* 
     * When handshake digest is determined, buffer is hashed and 
     * freed and MD_CTX for the required digest is stored here. 
     */ 
    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; 
    struct { 
        /* actually only need to be 16+20 for SSLv3 and 12 for TLS */ 
        unsigned char finish_md[EVP_MAX_MD_SIZE * 2]; 
        size_t finish_md_len; 
        unsigned char peer_finish_md[EVP_MAX_MD_SIZE * 2]; 
        size_t peer_finish_md_len; 
        size_t message_size; 
        int message_type; 
        /* used to hold the new cipher we are going to use */ 
        const SSL_CIPHER *new_cipher; 
# if !defined(OPENSSL_NO_EC) || !defined(OPENSSL_NO_DH) 
        EVP_PKEY *pkey;         /* holds short lived DH/ECDH key */ 
# endif 
        /* used for certificate requests */ 
        int cert_req; 
        /* Certificate types in certificate request message. */ 
        uint8_t *ctype; 
        size_t ctype_len; 
        /* Certificate authorities list peer sent */ 
        STACK_OF(X509_NAME) *peer_ca_names; 
        size_t key_block_length; 
        unsigned char *key_block; 
        const EVP_CIPHER *new_sym_enc; 
        const EVP_MD *new_hash; 
        int new_mac_pkey_type; 
        size_t new_mac_secret_size; 
# ifndef OPENSSL_NO_COMP 
        const SSL_COMP *new_compression; 
# else 
        char *new_compression; 
# endif 
        int cert_request; 
        /* Raw values of the cipher list from a client */ 
        unsigned char *ciphers_raw; 
        size_t ciphers_rawlen; 
        /* Temporary storage for premaster secret */ 
        unsigned char *pms; 
        size_t pmslen; 
# ifndef OPENSSL_NO_PSK 
        /* Temporary storage for PSK key */ 
        unsigned char *psk; 
        size_t psklen; 
# endif 
        /* Signature algorithm we actually use */ 
        const SIGALG_LOOKUP *sigalg; 
        /* Pointer to certificate we use */ 
        CERT_PKEY *cert; 
        /* 
         * signature algorithms peer reports: e.g. supported signature 
         * algorithms extension for server or as part of a certificate 
         * request for client. 
         * Keep track of the algorithms for TLS and X.509 usage separately. 
         */ 
        uint16_t *peer_sigalgs; 
        uint16_t *peer_cert_sigalgs; 
        /* Size of above arrays */ 
        size_t peer_sigalgslen; 
        size_t peer_cert_sigalgslen; 
        /* Sigalg peer actually uses */ 
        const SIGALG_LOOKUP *peer_sigalg; 
        /* 
         * Set if corresponding CERT_PKEY can be used with current 
         * SSL session: e.g. appropriate curve, signature algorithms etc. 
         * If zero it can't be used at all. 
         */ 
        uint32_t valid_flags[SSL_PKEY_NUM]; 
        /* 
         * For servers the following masks are for the key and auth algorithms 
         * that are supported by the certs below. For clients they are masks of 
         * *disabled* algorithms based on the current session. 
         */ 
        uint32_t mask_k; 
        uint32_t mask_a; 
        /* 
         * The following are used by the client to see if a cipher is allowed or 
         * not.  It contains the minimum and maximum version the client's using 
         * based on what it knows so far. 
         */ 
        int min_ver; 
        int max_ver; 
    } tmp; 
 
    /* Connection binding to prevent renegotiation attacks */ 
    unsigned char previous_client_finished[EVP_MAX_MD_SIZE]; 
    size_t previous_client_finished_len; 
    unsigned char previous_server_finished[EVP_MAX_MD_SIZE]; 
    size_t 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 npn_seen; 
# endif 
 
    /* 
     * 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; 
    size_t alpn_selected_len; 
    /* used by the server to know what options were proposed */ 
    unsigned char *alpn_proposed; 
    size_t alpn_proposed_len; 
    /* used by the client to know if it actually sent alpn */ 
    int alpn_sent; 
 
# 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 */ 
 
    /* For clients: peer temporary key */ 
# if !defined(OPENSSL_NO_EC) || !defined(OPENSSL_NO_DH) 
    /* The group_id for the DH/ECDH key */ 
    uint16_t group_id; 
    EVP_PKEY *peer_tmp; 
# endif 
 
} SSL3_STATE; 
 
/* DTLS structures */ 
 
# ifndef OPENSSL_NO_SCTP 
#  define DTLS1_SCTP_AUTH_LABEL   "EXPORTER_DTLS_OVER_SCTP" 
# endif 
 
/* Max MTU overhead we know about so far is 40 for IPv6 + 8 for UDP */ 
# define DTLS1_MAX_MTU_OVERHEAD                   48 
 
/* 
 * Flag used in message reuse to indicate the buffer contains the record 
 * header as well as the handshake message header. 
 */ 
# define DTLS1_SKIP_RECORD_HEADER                 2 
 
struct dtls1_retransmit_state { 
    EVP_CIPHER_CTX *enc_write_ctx; /* cryptographic state */ 
    EVP_MD_CTX *write_hash;     /* used for mac generation */ 
    COMP_CTX *compress;         /* compression */ 
    SSL_SESSION *session; 
    unsigned short epoch; 
}; 
 
struct hm_header_st { 
    unsigned char type; 
    size_t msg_len; 
    unsigned short seq; 
    size_t frag_off; 
    size_t frag_len; 
    unsigned int is_ccs; 
    struct dtls1_retransmit_state saved_retransmit_state; 
}; 
 
struct dtls1_timeout_st { 
    /* Number of read timeouts so far */ 
    unsigned int read_timeouts; 
    /* Number of write timeouts so far */ 
    unsigned int write_timeouts; 
    /* Number of alerts received so far */ 
    unsigned int num_alerts; 
}; 
 
typedef struct hm_fragment_st { 
    struct hm_header_st msg_header; 
    unsigned char *fragment; 
    unsigned char *reassembly; 
} hm_fragment; 
 
typedef struct pqueue_st pqueue; 
typedef struct pitem_st pitem; 
 
struct pitem_st { 
    unsigned char priority[8];  /* 64-bit value in big-endian encoding */ 
    void *data; 
    pitem *next; 
}; 
 
typedef struct pitem_st *piterator; 
 
pitem *pitem_new(unsigned char *prio64be, void *data); 
void pitem_free(pitem *item); 
pqueue *pqueue_new(void); 
void pqueue_free(pqueue *pq); 
pitem *pqueue_insert(pqueue *pq, pitem *item); 
pitem *pqueue_peek(pqueue *pq); 
pitem *pqueue_pop(pqueue *pq); 
pitem *pqueue_find(pqueue *pq, unsigned char *prio64be); 
pitem *pqueue_iterator(pqueue *pq); 
pitem *pqueue_next(piterator *iter); 
size_t pqueue_size(pqueue *pq); 
 
typedef struct dtls1_state_st { 
    unsigned char cookie[DTLS1_COOKIE_LENGTH]; 
    size_t cookie_len; 
    unsigned int cookie_verified; 
    /* handshake message numbers */ 
    unsigned short handshake_write_seq; 
    unsigned short next_handshake_write_seq; 
    unsigned short handshake_read_seq; 
    /* Buffered handshake messages */ 
    pqueue *buffered_messages; 
    /* Buffered (sent) handshake records */ 
    pqueue *sent_messages; 
    size_t link_mtu;      /* max on-the-wire DTLS packet size */ 
    size_t mtu;           /* max DTLS packet size */ 
    struct hm_header_st w_msg_hdr; 
    struct hm_header_st r_msg_hdr; 
    struct dtls1_timeout_st timeout; 
    /* 
     * Indicates when the last handshake msg sent will timeout 
     */ 
    struct timeval next_timeout; 
    /* Timeout duration */ 
    unsigned int timeout_duration_us; 
 
    unsigned int retransmitting; 
# ifndef OPENSSL_NO_SCTP 
    int shutdown_received; 
# endif 
 
    DTLS_timer_cb timer_cb; 
 
} DTLS1_STATE; 
 
# ifndef OPENSSL_NO_EC 
/* 
 * From ECC-TLS draft, used in encoding the curve type in ECParameters 
 */ 
#  define EXPLICIT_PRIME_CURVE_TYPE  1 
#  define EXPLICIT_CHAR2_CURVE_TYPE  2 
#  define NAMED_CURVE_TYPE           3 
# endif                         /* OPENSSL_NO_EC */ 
 
struct cert_pkey_st { 
    X509 *x509; 
    EVP_PKEY *privatekey; 
    /* Chain for this certificate */ 
    STACK_OF(X509) *chain; 
    /*- 
     * serverinfo data for this certificate.  The data is in TLS Extension 
     * wire format, specifically it's a series of records like: 
     *   uint16_t extension_type; // (RFC 5246, 7.4.1.4, Extension) 
     *   uint16_t length; 
     *   uint8_t data[length]; 
     */ 
    unsigned char *serverinfo; 
    size_t serverinfo_length; 
}; 
/* Retrieve Suite B flags */ 
# define tls1_suiteb(s)  (s->cert->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS) 
/* Uses to check strict mode: suite B modes are always strict */ 
# define SSL_CERT_FLAGS_CHECK_TLS_STRICT \ 
        (SSL_CERT_FLAG_SUITEB_128_LOS|SSL_CERT_FLAG_TLS_STRICT) 
 
typedef enum { 
    ENDPOINT_CLIENT = 0, 
    ENDPOINT_SERVER, 
    ENDPOINT_BOTH 
} ENDPOINT; 
 
 
typedef struct { 
    unsigned short ext_type; 
    ENDPOINT role; 
    /* The context which this extension applies to */ 
    unsigned int context; 
    /* 
     * Per-connection flags relating to this extension type: not used if 
     * part of an SSL_CTX structure. 
     */ 
    uint32_t ext_flags; 
    SSL_custom_ext_add_cb_ex add_cb; 
    SSL_custom_ext_free_cb_ex free_cb; 
    void *add_arg; 
    SSL_custom_ext_parse_cb_ex parse_cb; 
    void *parse_arg; 
} custom_ext_method; 
 
/* ext_flags values */ 
 
/* 
 * Indicates an extension has been received. Used to check for unsolicited or 
 * duplicate extensions. 
 */ 
# define SSL_EXT_FLAG_RECEIVED   0x1 
/* 
 * Indicates an extension has been sent: used to enable sending of 
 * corresponding ServerHello extension. 
 */ 
# define SSL_EXT_FLAG_SENT       0x2 
 
typedef struct { 
    custom_ext_method *meths; 
    size_t meths_count; 
} custom_ext_methods; 
 
typedef struct cert_st { 
    /* Current active set */ 
    /* 
     * ALWAYS points to an element of the pkeys array 
     * Probably it would make more sense to store 
     * an index, not a pointer. 
     */ 
    CERT_PKEY *key; 
# ifndef OPENSSL_NO_DH 
    EVP_PKEY *dh_tmp; 
    DH *(*dh_tmp_cb) (SSL *ssl, int is_export, int keysize); 
    int dh_tmp_auto; 
# endif 
    /* Flags related to certificates */ 
    uint32_t cert_flags; 
    CERT_PKEY pkeys[SSL_PKEY_NUM]; 
    /* Custom certificate types sent in certificate request message. */ 
    uint8_t *ctype; 
    size_t ctype_len; 
    /* 
     * supported signature algorithms. When set on a client this is sent in 
     * the client hello as the supported signature algorithms extension. For 
     * servers it represents the signature algorithms we are willing to use. 
     */ 
    uint16_t *conf_sigalgs; 
    /* Size of above array */ 
    size_t conf_sigalgslen; 
    /* 
     * Client authentication signature algorithms, if not set then uses 
     * conf_sigalgs. On servers these will be the signature algorithms sent 
     * to the client in a certificate request for TLS 1.2. On a client this 
     * represents the signature algorithms we are willing to use for client 
     * authentication. 
     */ 
    uint16_t *client_sigalgs; 
    /* Size of above array */ 
    size_t client_sigalgslen; 
    /* 
     * Certificate setup callback: if set is called whenever a certificate 
     * may be required (client or server). the callback can then examine any 
     * appropriate parameters and setup any certificates required. This 
     * allows advanced applications to select certificates on the fly: for 
     * example based on supported signature algorithms or curves. 
     */ 
    int (*cert_cb) (SSL *ssl, void *arg); 
    void *cert_cb_arg; 
    /* 
     * Optional X509_STORE for chain building or certificate validation If 
     * NULL the parent SSL_CTX store is used instead. 
     */ 
    X509_STORE *chain_store; 
    X509_STORE *verify_store; 
    /* Custom extensions */ 
    custom_ext_methods custext; 
    /* Security callback */ 
    int (*sec_cb) (const SSL *s, const SSL_CTX *ctx, int op, int bits, int nid, 
                   void *other, void *ex); 
    /* Security level */ 
    int sec_level; 
    void *sec_ex; 
# ifndef OPENSSL_NO_PSK 
    /* If not NULL psk identity hint to use for servers */ 
    char *psk_identity_hint; 
# endif 
    CRYPTO_REF_COUNT references;             /* >1 only if SSL_copy_session_id is used */ 
    CRYPTO_RWLOCK *lock; 
} CERT; 
 
# define FP_ICC  (int (*)(const void *,const void *)) 
 
/* 
 * This is for the SSLv3/TLSv1.0 differences in crypto/hash stuff It is a bit 
 * of a mess of functions, but hell, think of it as an opaque structure :-) 
 */ 
typedef struct ssl3_enc_method { 
    int (*enc) (SSL *, SSL3_RECORD *, size_t, int); 
    int (*mac) (SSL *, SSL3_RECORD *, unsigned char *, int); 
    int (*setup_key_block) (SSL *); 
    int (*generate_master_secret) (SSL *, unsigned char *, unsigned char *, 
                                   size_t, size_t *); 
    int (*change_cipher_state) (SSL *, int); 
    size_t (*final_finish_mac) (SSL *, const char *, size_t, unsigned char *); 
    const char *client_finished_label; 
    size_t client_finished_label_len; 
    const char *server_finished_label; 
    size_t server_finished_label_len; 
    int (*alert_value) (int); 
    int (*export_keying_material) (SSL *, unsigned char *, size_t, 
                                   const char *, size_t, 
                                   const unsigned char *, size_t, 
                                   int use_context); 
    /* Various flags indicating protocol version requirements */ 
    uint32_t enc_flags; 
    /* Set the handshake header */ 
    int (*set_handshake_header) (SSL *s, WPACKET *pkt, int type); 
    /* Close construction of the handshake message */ 
    int (*close_construct_packet) (SSL *s, WPACKET *pkt, int htype); 
    /* Write out handshake message */ 
    int (*do_write) (SSL *s); 
} SSL3_ENC_METHOD; 
 
# define ssl_set_handshake_header(s, pkt, htype) \ 
        s->method->ssl3_enc->set_handshake_header((s), (pkt), (htype)) 
# define ssl_close_construct_packet(s, pkt, htype) \ 
        s->method->ssl3_enc->close_construct_packet((s), (pkt), (htype)) 
# define ssl_do_write(s)  s->method->ssl3_enc->do_write(s) 
 
/* Values for enc_flags */ 
 
/* Uses explicit IV for CBC mode */ 
# define SSL_ENC_FLAG_EXPLICIT_IV        0x1 
/* Uses signature algorithms extension */ 
# define SSL_ENC_FLAG_SIGALGS            0x2 
/* Uses SHA256 default PRF */ 
# define SSL_ENC_FLAG_SHA256_PRF         0x4 
/* Is DTLS */ 
# define SSL_ENC_FLAG_DTLS               0x8 
/* 
 * Allow TLS 1.2 ciphersuites: applies to DTLS 1.2 as well as TLS 1.2: may 
 * apply to others in future. 
 */ 
# define SSL_ENC_FLAG_TLS1_2_CIPHERS     0x10 
 
# ifndef OPENSSL_NO_COMP 
/* Used for holding the relevant compression methods loaded into SSL_CTX */ 
typedef struct ssl3_comp_st { 
    int comp_id;                /* The identifier byte for this compression 
                                 * type */ 
    char *name;                 /* Text name used for the compression type */ 
    COMP_METHOD *method;        /* The method :-) */ 
} SSL3_COMP; 
# endif 
 
typedef enum downgrade_en { 
    DOWNGRADE_NONE, 
    DOWNGRADE_TO_1_2, 
    DOWNGRADE_TO_1_1 
} DOWNGRADE; 
 
/* 
 * Dummy status type for the status_type extension. Indicates no status type 
 * set 
 */ 
#define TLSEXT_STATUSTYPE_nothing  -1 
 
/* Sigalgs values */ 
#define TLSEXT_SIGALG_ecdsa_secp256r1_sha256                    0x0403 
#define TLSEXT_SIGALG_ecdsa_secp384r1_sha384                    0x0503 
#define TLSEXT_SIGALG_ecdsa_secp521r1_sha512                    0x0603 
#define TLSEXT_SIGALG_ecdsa_sha224                              0x0303 
#define TLSEXT_SIGALG_ecdsa_sha1                                0x0203 
#define TLSEXT_SIGALG_rsa_pss_rsae_sha256                       0x0804 
#define TLSEXT_SIGALG_rsa_pss_rsae_sha384                       0x0805 
#define TLSEXT_SIGALG_rsa_pss_rsae_sha512                       0x0806 
#define TLSEXT_SIGALG_rsa_pss_pss_sha256                        0x0809 
#define TLSEXT_SIGALG_rsa_pss_pss_sha384                        0x080a 
#define TLSEXT_SIGALG_rsa_pss_pss_sha512                        0x080b 
#define TLSEXT_SIGALG_rsa_pkcs1_sha256                          0x0401 
#define TLSEXT_SIGALG_rsa_pkcs1_sha384                          0x0501 
#define TLSEXT_SIGALG_rsa_pkcs1_sha512                          0x0601 
#define TLSEXT_SIGALG_rsa_pkcs1_sha224                          0x0301 
#define TLSEXT_SIGALG_rsa_pkcs1_sha1                            0x0201 
#define TLSEXT_SIGALG_dsa_sha256                                0x0402 
#define TLSEXT_SIGALG_dsa_sha384                                0x0502 
#define TLSEXT_SIGALG_dsa_sha512                                0x0602 
#define TLSEXT_SIGALG_dsa_sha224                                0x0302 
#define TLSEXT_SIGALG_dsa_sha1                                  0x0202 
#define TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256       0xeeee 
#define TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512       0xefef 
#define TLSEXT_SIGALG_gostr34102001_gostr3411                   0xeded 
 
#define TLSEXT_SIGALG_ed25519                                   0x0807 
#define TLSEXT_SIGALG_ed448                                     0x0808 
 
/* Known PSK key exchange modes */ 
#define TLSEXT_KEX_MODE_KE                                      0x00 
#define TLSEXT_KEX_MODE_KE_DHE                                  0x01 
 
/* 
 * Internal representations of key exchange modes 
 */ 
#define TLSEXT_KEX_MODE_FLAG_NONE                               0 
#define TLSEXT_KEX_MODE_FLAG_KE                                 1 
#define TLSEXT_KEX_MODE_FLAG_KE_DHE                             2 
 
#define SSL_USE_PSS(s) (s->s3->tmp.peer_sigalg != NULL && \ 
                        s->s3->tmp.peer_sigalg->sig == EVP_PKEY_RSA_PSS) 
 
/* A dummy signature value not valid for TLSv1.2 signature algs */ 
#define TLSEXT_signature_rsa_pss                                0x0101 
 
/* TLSv1.3 downgrade protection sentinel values */ 
extern const unsigned char tls11downgrade[8]; 
extern const unsigned char tls12downgrade[8]; 
 
extern SSL3_ENC_METHOD ssl3_undef_enc_method; 
 
__owur const SSL_METHOD *ssl_bad_method(int ver); 
__owur const SSL_METHOD *sslv3_method(void); 
__owur const SSL_METHOD *sslv3_server_method(void); 
__owur const SSL_METHOD *sslv3_client_method(void); 
__owur const SSL_METHOD *tlsv1_method(void); 
__owur const SSL_METHOD *tlsv1_server_method(void); 
__owur const SSL_METHOD *tlsv1_client_method(void); 
__owur const SSL_METHOD *tlsv1_1_method(void); 
__owur const SSL_METHOD *tlsv1_1_server_method(void); 
__owur const SSL_METHOD *tlsv1_1_client_method(void); 
__owur const SSL_METHOD *tlsv1_2_method(void); 
__owur const SSL_METHOD *tlsv1_2_server_method(void); 
__owur const SSL_METHOD *tlsv1_2_client_method(void); 
__owur const SSL_METHOD *tlsv1_3_method(void); 
__owur const SSL_METHOD *tlsv1_3_server_method(void); 
__owur const SSL_METHOD *tlsv1_3_client_method(void); 
__owur const SSL_METHOD *dtlsv1_method(void); 
__owur const SSL_METHOD *dtlsv1_server_method(void); 
__owur const SSL_METHOD *dtlsv1_client_method(void); 
__owur const SSL_METHOD *dtls_bad_ver_client_method(void); 
__owur const SSL_METHOD *dtlsv1_2_method(void); 
__owur const SSL_METHOD *dtlsv1_2_server_method(void); 
__owur const SSL_METHOD *dtlsv1_2_client_method(void); 
 
extern const SSL3_ENC_METHOD TLSv1_enc_data; 
extern const SSL3_ENC_METHOD TLSv1_1_enc_data; 
extern const SSL3_ENC_METHOD TLSv1_2_enc_data; 
extern const SSL3_ENC_METHOD TLSv1_3_enc_data; 
extern const SSL3_ENC_METHOD SSLv3_enc_data; 
extern const SSL3_ENC_METHOD DTLSv1_enc_data; 
extern const SSL3_ENC_METHOD DTLSv1_2_enc_data; 
 
/* 
 * Flags for SSL methods 
 */ 
# define SSL_METHOD_NO_FIPS      (1U<<0) 
# define SSL_METHOD_NO_SUITEB    (1U<<1) 
 
# define IMPLEMENT_tls_meth_func(version, flags, mask, func_name, s_accept, \ 
                                 s_connect, enc_data) \ 
const SSL_METHOD *func_name(void)  \ 
        { \ 
        static const SSL_METHOD func_name##_data= { \ 
                version, \ 
                flags, \ 
                mask, \ 
                tls1_new, \ 
                tls1_clear, \ 
                tls1_free, \ 
                s_accept, \ 
                s_connect, \ 
                ssl3_read, \ 
                ssl3_peek, \ 
                ssl3_write, \ 
                ssl3_shutdown, \ 
                ssl3_renegotiate, \ 
                ssl3_renegotiate_check, \ 
                ssl3_read_bytes, \ 
                ssl3_write_bytes, \ 
                ssl3_dispatch_alert, \ 
                ssl3_ctrl, \ 
                ssl3_ctx_ctrl, \ 
                ssl3_get_cipher_by_char, \ 
                ssl3_put_cipher_by_char, \ 
                ssl3_pending, \ 
                ssl3_num_ciphers, \ 
                ssl3_get_cipher, \ 
                tls1_default_timeout, \ 
                &enc_data, \ 
                ssl_undefined_void_function, \ 
                ssl3_callback_ctrl, \ 
                ssl3_ctx_callback_ctrl, \ 
        }; \ 
        return &func_name##_data; \ 
        } 
 
# define IMPLEMENT_ssl3_meth_func(func_name, s_accept, s_connect) \ 
const SSL_METHOD *func_name(void)  \ 
        { \ 
        static const SSL_METHOD func_name##_data= { \ 
                SSL3_VERSION, \ 
                SSL_METHOD_NO_FIPS | SSL_METHOD_NO_SUITEB, \ 
                SSL_OP_NO_SSLv3, \ 
                ssl3_new, \ 
                ssl3_clear, \ 
                ssl3_free, \ 
                s_accept, \ 
                s_connect, \ 
                ssl3_read, \ 
                ssl3_peek, \ 
                ssl3_write, \ 
                ssl3_shutdown, \ 
                ssl3_renegotiate, \ 
                ssl3_renegotiate_check, \ 
                ssl3_read_bytes, \ 
                ssl3_write_bytes, \ 
                ssl3_dispatch_alert, \ 
                ssl3_ctrl, \ 
                ssl3_ctx_ctrl, \ 
                ssl3_get_cipher_by_char, \ 
                ssl3_put_cipher_by_char, \ 
                ssl3_pending, \ 
                ssl3_num_ciphers, \ 
                ssl3_get_cipher, \ 
                ssl3_default_timeout, \ 
                &SSLv3_enc_data, \ 
                ssl_undefined_void_function, \ 
                ssl3_callback_ctrl, \ 
                ssl3_ctx_callback_ctrl, \ 
        }; \ 
        return &func_name##_data; \ 
        } 
 
# define IMPLEMENT_dtls1_meth_func(version, flags, mask, func_name, s_accept, \ 
                                        s_connect, enc_data) \ 
const SSL_METHOD *func_name(void)  \ 
        { \ 
        static const SSL_METHOD func_name##_data= { \ 
                version, \ 
                flags, \ 
                mask, \ 
                dtls1_new, \ 
                dtls1_clear, \ 
                dtls1_free, \ 
                s_accept, \ 
                s_connect, \ 
                ssl3_read, \ 
                ssl3_peek, \ 
                ssl3_write, \ 
                dtls1_shutdown, \ 
                ssl3_renegotiate, \ 
                ssl3_renegotiate_check, \ 
                dtls1_read_bytes, \ 
                dtls1_write_app_data_bytes, \ 
                dtls1_dispatch_alert, \ 
                dtls1_ctrl, \ 
                ssl3_ctx_ctrl, \ 
                ssl3_get_cipher_by_char, \ 
                ssl3_put_cipher_by_char, \ 
                ssl3_pending, \ 
                ssl3_num_ciphers, \ 
                ssl3_get_cipher, \ 
                dtls1_default_timeout, \ 
                &enc_data, \ 
                ssl_undefined_void_function, \ 
                ssl3_callback_ctrl, \ 
                ssl3_ctx_callback_ctrl, \ 
        }; \ 
        return &func_name##_data; \ 
        } 
 
struct openssl_ssl_test_functions { 
    int (*p_ssl_init_wbio_buffer) (SSL *s); 
    int (*p_ssl3_setup_buffers) (SSL *s); 
}; 
 
const char *ssl_protocol_to_string(int version); 
 
/* Returns true if certificate and private key for 'idx' are present */ 
static ossl_inline int ssl_has_cert(const SSL *s, int idx) 
{ 
    if (idx < 0 || idx >= SSL_PKEY_NUM) 
        return 0; 
    return s->cert->pkeys[idx].x509 != NULL 
        && s->cert->pkeys[idx].privatekey != NULL; 
} 
 
static ossl_inline void tls1_get_peer_groups(SSL *s, const uint16_t **pgroups, 
                                             size_t *pgroupslen) 
{ 
    *pgroups = s->ext.peer_supportedgroups; 
    *pgroupslen = s->ext.peer_supportedgroups_len; 
} 
 
# ifndef OPENSSL_UNIT_TEST 
 
__owur int ssl_read_internal(SSL *s, void *buf, size_t num, size_t *readbytes); 
__owur int ssl_write_internal(SSL *s, const void *buf, size_t num, size_t *written); 
void ssl_clear_cipher_ctx(SSL *s); 
int ssl_clear_bad_session(SSL *s); 
__owur CERT *ssl_cert_new(void); 
__owur CERT *ssl_cert_dup(CERT *cert); 
void ssl_cert_clear_certs(CERT *c); 
void ssl_cert_free(CERT *c); 
__owur int ssl_generate_session_id(SSL *s, SSL_SESSION *ss); 
__owur int ssl_get_new_session(SSL *s, int session); 
__owur SSL_SESSION *lookup_sess_in_cache(SSL *s, const unsigned char *sess_id, 
                                         size_t sess_id_len); 
__owur int ssl_get_prev_session(SSL *s, CLIENTHELLO_MSG *hello); 
__owur SSL_SESSION *ssl_session_dup(SSL_SESSION *src, int ticket); 
__owur int ssl_cipher_id_cmp(const SSL_CIPHER *a, const SSL_CIPHER *b); 
DECLARE_OBJ_BSEARCH_GLOBAL_CMP_FN(SSL_CIPHER, SSL_CIPHER, ssl_cipher_id); 
__owur int ssl_cipher_ptr_id_cmp(const SSL_CIPHER *const *ap, 
                                 const SSL_CIPHER *const *bp); 
__owur STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method, 
                                                    STACK_OF(SSL_CIPHER) *tls13_ciphersuites, 
                                                    STACK_OF(SSL_CIPHER) **cipher_list, 
                                                    STACK_OF(SSL_CIPHER) **cipher_list_by_id, 
                                                    const char *rule_str, 
                                                    CERT *c); 
__owur int ssl_cache_cipherlist(SSL *s, PACKET *cipher_suites, int sslv2format); 
__owur int bytes_to_cipher_list(SSL *s, PACKET *cipher_suites, 
                                STACK_OF(SSL_CIPHER) **skp, 
                                STACK_OF(SSL_CIPHER) **scsvs, int sslv2format, 
                                int fatal); 
void ssl_update_cache(SSL *s, int mode); 
__owur int ssl_cipher_get_evp(const SSL_SESSION *s, const EVP_CIPHER **enc, 
                              const EVP_MD **md, int *mac_pkey_type, 
                              size_t *mac_secret_size, SSL_COMP **comp, 
                              int use_etm); 
__owur int ssl_cipher_get_overhead(const SSL_CIPHER *c, size_t *mac_overhead, 
                                   size_t *int_overhead, size_t *blocksize, 
                                   size_t *ext_overhead); 
__owur int ssl_cert_is_disabled(size_t idx); 
__owur const SSL_CIPHER *ssl_get_cipher_by_char(SSL *ssl, 
                                                const unsigned char *ptr, 
                                                int all); 
__owur int ssl_cert_set0_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain); 
__owur int ssl_cert_set1_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain); 
__owur int ssl_cert_add0_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x); 
__owur int ssl_cert_add1_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x); 
__owur int ssl_cert_select_current(CERT *c, X509 *x); 
__owur int ssl_cert_set_current(CERT *c, long arg); 
void ssl_cert_set_cert_cb(CERT *c, int (*cb) (SSL *ssl, void *arg), void *arg); 
 
__owur int ssl_verify_cert_chain(SSL *s, STACK_OF(X509) *sk); 
__owur int ssl_build_cert_chain(SSL *s, SSL_CTX *ctx, int flags); 
__owur int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, 
                                   int ref); 
 
__owur int ssl_security(const SSL *s, int op, int bits, int nid, void *other); 
__owur int ssl_ctx_security(const SSL_CTX *ctx, int op, int bits, int nid, 
                            void *other); 
int ssl_get_security_level_bits(const SSL *s, const SSL_CTX *ctx, int *levelp);
 
__owur int ssl_cert_lookup_by_nid(int nid, size_t *pidx); 
__owur const SSL_CERT_LOOKUP *ssl_cert_lookup_by_pkey(const EVP_PKEY *pk, 
                                                      size_t *pidx); 
__owur const SSL_CERT_LOOKUP *ssl_cert_lookup_by_idx(size_t idx); 
 
int ssl_undefined_function(SSL *s); 
__owur int ssl_undefined_void_function(void); 
__owur int ssl_undefined_const_function(const SSL *s); 
__owur int ssl_get_server_cert_serverinfo(SSL *s, 
                                          const unsigned char **serverinfo, 
                                          size_t *serverinfo_length); 
void ssl_set_masks(SSL *s); 
__owur STACK_OF(SSL_CIPHER) *ssl_get_ciphers_by_id(SSL *s); 
__owur int ssl_x509err2alert(int type); 
void ssl_sort_cipher_list(void); 
int ssl_load_ciphers(void); 
__owur int ssl_fill_hello_random(SSL *s, int server, unsigned char *field, 
                                 size_t len, DOWNGRADE dgrd); 
__owur int ssl_generate_master_secret(SSL *s, unsigned char *pms, size_t pmslen, 
                                      int free_pms); 
__owur EVP_PKEY *ssl_generate_pkey(EVP_PKEY *pm); 
__owur int ssl_derive(SSL *s, EVP_PKEY *privkey, EVP_PKEY *pubkey, 
                      int genmaster); 
__owur EVP_PKEY *ssl_dh_to_pkey(DH *dh); 
__owur unsigned int ssl_get_max_send_fragment(const SSL *ssl); 
__owur unsigned int ssl_get_split_send_fragment(const SSL *ssl); 
 
__owur const SSL_CIPHER *ssl3_get_cipher_by_id(uint32_t id); 
__owur const SSL_CIPHER *ssl3_get_cipher_by_std_name(const char *stdname); 
__owur const SSL_CIPHER *ssl3_get_cipher_by_char(const unsigned char *p); 
__owur int ssl3_put_cipher_by_char(const SSL_CIPHER *c, WPACKET *pkt, 
                                   size_t *len); 
int ssl3_init_finished_mac(SSL *s); 
__owur int ssl3_setup_key_block(SSL *s); 
__owur int ssl3_change_cipher_state(SSL *s, int which); 
void ssl3_cleanup_key_block(SSL *s); 
__owur int ssl3_do_write(SSL *s, int type); 
int ssl3_send_alert(SSL *s, int level, int desc); 
__owur int ssl3_generate_master_secret(SSL *s, unsigned char *out, 
                                       unsigned char *p, size_t len, 
                                       size_t *secret_size); 
__owur int ssl3_get_req_cert_type(SSL *s, WPACKET *pkt); 
__owur int ssl3_num_ciphers(void); 
__owur const SSL_CIPHER *ssl3_get_cipher(unsigned int u); 
int ssl3_renegotiate(SSL *ssl); 
int ssl3_renegotiate_check(SSL *ssl, int initok); 
__owur int ssl3_dispatch_alert(SSL *s); 
__owur size_t ssl3_final_finish_mac(SSL *s, const char *sender, size_t slen, 
                                    unsigned char *p); 
__owur int ssl3_finish_mac(SSL *s, const unsigned char *buf, size_t len); 
void ssl3_free_digest_list(SSL *s); 
__owur unsigned long ssl3_output_cert_chain(SSL *s, WPACKET *pkt, 
                                            CERT_PKEY *cpk); 
__owur const SSL_CIPHER *ssl3_choose_cipher(SSL *ssl, 
                                            STACK_OF(SSL_CIPHER) *clnt, 
                                            STACK_OF(SSL_CIPHER) *srvr); 
__owur int ssl3_digest_cached_records(SSL *s, int keep); 
__owur int ssl3_new(SSL *s); 
void ssl3_free(SSL *s); 
__owur int ssl3_read(SSL *s, void *buf, size_t len, size_t *readbytes); 
__owur int ssl3_peek(SSL *s, void *buf, size_t len, size_t *readbytes); 
__owur int ssl3_write(SSL *s, const void *buf, size_t len, size_t *written); 
__owur int ssl3_shutdown(SSL *s); 
int ssl3_clear(SSL *s); 
__owur long ssl3_ctrl(SSL *s, int cmd, long larg, void *parg); 
__owur long ssl3_ctx_ctrl(SSL_CTX *s, int cmd, long larg, void *parg); 
__owur long ssl3_callback_ctrl(SSL *s, int cmd, void (*fp) (void)); 
__owur long ssl3_ctx_callback_ctrl(SSL_CTX *s, int cmd, void (*fp) (void)); 
 
__owur int ssl3_do_change_cipher_spec(SSL *ssl); 
__owur long ssl3_default_timeout(void); 
 
__owur int ssl3_set_handshake_header(SSL *s, WPACKET *pkt, int htype); 
__owur int tls_close_construct_packet(SSL *s, WPACKET *pkt, int htype); 
__owur int tls_setup_handshake(SSL *s); 
__owur int dtls1_set_handshake_header(SSL *s, WPACKET *pkt, int htype); 
__owur int dtls1_close_construct_packet(SSL *s, WPACKET *pkt, int htype); 
__owur int ssl3_handshake_write(SSL *s); 
 
__owur int ssl_allow_compression(SSL *s); 
 
__owur int ssl_version_supported(const SSL *s, int version, 
                                 const SSL_METHOD **meth); 
 
__owur int ssl_set_client_hello_version(SSL *s); 
__owur int ssl_check_version_downgrade(SSL *s); 
__owur int ssl_set_version_bound(int method_version, int version, int *bound); 
__owur int ssl_choose_server_version(SSL *s, CLIENTHELLO_MSG *hello, 
                                     DOWNGRADE *dgrd); 
__owur int ssl_choose_client_version(SSL *s, int version, 
                                     RAW_EXTENSION *extensions); 
__owur int ssl_get_min_max_version(const SSL *s, int *min_version, 
                                   int *max_version, int *real_max); 
 
__owur long tls1_default_timeout(void); 
__owur int dtls1_do_write(SSL *s, int type); 
void dtls1_set_message_header(SSL *s, 
                              unsigned char mt, 
                              size_t len, 
                              size_t frag_off, size_t frag_len); 
 
int dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, size_t len, 
                               size_t *written); 
 
__owur int dtls1_read_failed(SSL *s, int code); 
__owur int dtls1_buffer_message(SSL *s, int ccs); 
__owur int dtls1_retransmit_message(SSL *s, unsigned short seq, int *found); 
__owur int dtls1_get_queue_priority(unsigned short seq, int is_ccs); 
int dtls1_retransmit_buffered_messages(SSL *s); 
void dtls1_clear_received_buffer(SSL *s); 
void dtls1_clear_sent_buffer(SSL *s); 
void dtls1_get_message_header(unsigned char *data, 
                              struct hm_header_st *msg_hdr); 
__owur long dtls1_default_timeout(void); 
__owur struct timeval *dtls1_get_timeout(SSL *s, struct timeval *timeleft); 
__owur int dtls1_check_timeout_num(SSL *s); 
__owur int dtls1_handle_timeout(SSL *s); 
void dtls1_start_timer(SSL *s); 
void dtls1_stop_timer(SSL *s); 
__owur int dtls1_is_timer_expired(SSL *s); 
__owur int dtls_raw_hello_verify_request(WPACKET *pkt, unsigned char *cookie, 
                                         size_t cookie_len); 
__owur size_t dtls1_min_mtu(SSL *s); 
void dtls1_hm_fragment_free(hm_fragment *frag); 
__owur int dtls1_query_mtu(SSL *s); 
 
__owur int tls1_new(SSL *s); 
void tls1_free(SSL *s); 
int tls1_clear(SSL *s); 
 
__owur int dtls1_new(SSL *s); 
void dtls1_free(SSL *s); 
int dtls1_clear(SSL *s); 
long dtls1_ctrl(SSL *s, int cmd, long larg, void *parg); 
__owur int dtls1_shutdown(SSL *s); 
 
__owur int dtls1_dispatch_alert(SSL *s); 
 
__owur int ssl_init_wbio_buffer(SSL *s); 
int ssl_free_wbio_buffer(SSL *s); 
 
__owur int tls1_change_cipher_state(SSL *s, int which); 
__owur int tls1_setup_key_block(SSL *s); 
__owur size_t tls1_final_finish_mac(SSL *s, const char *str, size_t slen, 
                                    unsigned char *p); 
__owur int tls1_generate_master_secret(SSL *s, unsigned char *out, 
                                       unsigned char *p, size_t len, 
                                       size_t *secret_size); 
__owur int tls13_setup_key_block(SSL *s); 
__owur size_t tls13_final_finish_mac(SSL *s, const char *str, size_t slen, 
                                     unsigned char *p); 
__owur int tls13_change_cipher_state(SSL *s, int which); 
__owur int tls13_update_key(SSL *s, int send); 
__owur int tls13_hkdf_expand(SSL *s, const EVP_MD *md, 
                             const unsigned char *secret, 
                             const unsigned char *label, size_t labellen, 
                             const unsigned char *data, size_t datalen, 
                             unsigned char *out, size_t outlen, int fatal); 
__owur int tls13_derive_key(SSL *s, const EVP_MD *md, 
                            const unsigned char *secret, unsigned char *key, 
                            size_t keylen); 
__owur int tls13_derive_iv(SSL *s, const EVP_MD *md, 
                           const unsigned char *secret, unsigned char *iv, 
                           size_t ivlen); 
__owur int tls13_derive_finishedkey(SSL *s, const EVP_MD *md, 
                                    const unsigned char *secret, 
                                    unsigned char *fin, size_t finlen); 
int tls13_generate_secret(SSL *s, const EVP_MD *md, 
                          const unsigned char *prevsecret, 
                          const unsigned char *insecret, 
                          size_t insecretlen, 
                          unsigned char *outsecret); 
__owur int tls13_generate_handshake_secret(SSL *s, 
                                           const unsigned char *insecret, 
                                           size_t insecretlen); 
__owur int tls13_generate_master_secret(SSL *s, unsigned char *out, 
                                        unsigned char *prev, size_t prevlen, 
                                        size_t *secret_size); 
__owur int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen, 
                                       const char *label, size_t llen, 
                                       const unsigned char *p, size_t plen, 
                                       int use_context); 
__owur int tls13_export_keying_material(SSL *s, unsigned char *out, size_t olen, 
                                        const char *label, size_t llen, 
                                        const unsigned char *context, 
                                        size_t contextlen, int use_context); 
__owur int tls13_export_keying_material_early(SSL *s, unsigned char *out, 
                                              size_t olen, const char *label, 
                                              size_t llen, 
                                              const unsigned char *context, 
                                              size_t contextlen); 
__owur int tls1_alert_code(int code); 
__owur int tls13_alert_code(int code); 
__owur int ssl3_alert_code(int code); 
 
#  ifndef OPENSSL_NO_EC 
__owur int ssl_check_srvr_ecc_cert_and_alg(X509 *x, SSL *s); 
#  endif 
 
SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n); 
 
#  ifndef OPENSSL_NO_EC 
 
__owur const TLS_GROUP_INFO *tls1_group_id_lookup(uint16_t curve_id); 
__owur int tls1_check_group_id(SSL *s, uint16_t group_id, int check_own_curves); 
__owur uint16_t tls1_shared_group(SSL *s, int nmatch); 
__owur int tls1_set_groups(uint16_t **pext, size_t *pextlen, 
                           int *curves, size_t ncurves); 
__owur int tls1_set_groups_list(uint16_t **pext, size_t *pextlen, 
                                const char *str); 
void tls1_get_formatlist(SSL *s, const unsigned char **pformats, 
                         size_t *num_formats); 
__owur int tls1_check_ec_tmp_key(SSL *s, unsigned long id); 
__owur EVP_PKEY *ssl_generate_pkey_group(SSL *s, uint16_t id); 
__owur EVP_PKEY *ssl_generate_param_group(uint16_t id); 
#  endif                        /* OPENSSL_NO_EC */ 
 
__owur int tls_curve_allowed(SSL *s, uint16_t curve, int op); 
void tls1_get_supported_groups(SSL *s, const uint16_t **pgroups, 
                               size_t *pgroupslen); 
 
__owur int tls1_set_server_sigalgs(SSL *s); 
 
__owur SSL_TICKET_STATUS tls_get_ticket_from_client(SSL *s, CLIENTHELLO_MSG *hello, 
                                                    SSL_SESSION **ret); 
__owur SSL_TICKET_STATUS tls_decrypt_ticket(SSL *s, const unsigned char *etick, 
                                            size_t eticklen, 
                                            const unsigned char *sess_id, 
                                            size_t sesslen, SSL_SESSION **psess); 
 
__owur int tls_use_ticket(SSL *s); 
 
void ssl_set_sig_mask(uint32_t *pmask_a, SSL *s, int op); 
 
__owur int tls1_set_sigalgs_list(CERT *c, const char *str, int client); 
__owur int tls1_set_raw_sigalgs(CERT *c, const uint16_t *psigs, size_t salglen, 
                                int client); 
__owur int tls1_set_sigalgs(CERT *c, const int *salg, size_t salglen, 
                            int client); 
int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain, 
                     int idx); 
void tls1_set_cert_validity(SSL *s); 
 
#  ifndef OPENSSL_NO_CT 
__owur int ssl_validate_ct(SSL *s); 
#  endif 
 
#  ifndef OPENSSL_NO_DH 
__owur DH *ssl_get_auto_dh(SSL *s); 
#  endif 
 
__owur int ssl_security_cert(SSL *s, SSL_CTX *ctx, X509 *x, int vfy, int is_ee); 
__owur int ssl_security_cert_chain(SSL *s, STACK_OF(X509) *sk, X509 *ex, 
                                   int vfy); 
 
int tls_choose_sigalg(SSL *s, int fatalerrs); 
 
__owur EVP_MD_CTX *ssl_replace_hash(EVP_MD_CTX **hash, const EVP_MD *md); 
void ssl_clear_hash_ctx(EVP_MD_CTX **hash); 
__owur long ssl_get_algorithm2(SSL *s); 
__owur int tls12_copy_sigalgs(SSL *s, WPACKET *pkt, 
                              const uint16_t *psig, size_t psiglen); 
__owur int tls1_save_u16(PACKET *pkt, uint16_t **pdest, size_t *pdestlen); 
__owur int tls1_save_sigalgs(SSL *s, PACKET *pkt, int cert); 
__owur int tls1_process_sigalgs(SSL *s); 
__owur int tls1_set_peer_legacy_sigalg(SSL *s, const EVP_PKEY *pkey); 
__owur int tls1_lookup_md(const SIGALG_LOOKUP *lu, const EVP_MD **pmd); 
__owur size_t tls12_get_psigalgs(SSL *s, int sent, const uint16_t **psigs); 
#  ifndef OPENSSL_NO_EC 
__owur int tls_check_sigalg_curve(const SSL *s, int curve); 
#  endif 
__owur int tls12_check_peer_sigalg(SSL *s, uint16_t, EVP_PKEY *pkey); 
__owur int ssl_set_client_disabled(SSL *s); 
__owur int ssl_cipher_disabled(const SSL *s, const SSL_CIPHER *c, int op, int echde); 
 
__owur int ssl_handshake_hash(SSL *s, unsigned char *out, size_t outlen, 
                                 size_t *hashlen); 
__owur const EVP_MD *ssl_md(int idx); 
__owur const EVP_MD *ssl_handshake_md(SSL *s); 
__owur const EVP_MD *ssl_prf_md(SSL *s); 
 
/* 
 * ssl_log_rsa_client_key_exchange logs |premaster| to the SSL_CTX associated 
 * with |ssl|, if logging is enabled. It returns one on success and zero on 
 * failure. The entry is identified by the first 8 bytes of 
 * |encrypted_premaster|. 
 */ 
__owur int ssl_log_rsa_client_key_exchange(SSL *ssl, 
                                           const uint8_t *encrypted_premaster, 
                                           size_t encrypted_premaster_len, 
                                           const uint8_t *premaster, 
                                           size_t premaster_len); 
 
/* 
 * ssl_log_secret logs |secret| to the SSL_CTX associated with |ssl|, if 
 * logging is available. It returns one on success and zero on failure. It tags 
 * the entry with |label|. 
 */ 
__owur int ssl_log_secret(SSL *ssl, const char *label, 
                          const uint8_t *secret, size_t secret_len); 
 
#define MASTER_SECRET_LABEL "CLIENT_RANDOM" 
#define CLIENT_EARLY_LABEL "CLIENT_EARLY_TRAFFIC_SECRET" 
#define CLIENT_HANDSHAKE_LABEL "CLIENT_HANDSHAKE_TRAFFIC_SECRET" 
#define SERVER_HANDSHAKE_LABEL "SERVER_HANDSHAKE_TRAFFIC_SECRET" 
#define CLIENT_APPLICATION_LABEL "CLIENT_TRAFFIC_SECRET_0" 
#define SERVER_APPLICATION_LABEL "SERVER_TRAFFIC_SECRET_0" 
#define EARLY_EXPORTER_SECRET_LABEL "EARLY_EXPORTER_SECRET" 
#define EXPORTER_SECRET_LABEL "EXPORTER_SECRET" 
 
/* s3_cbc.c */ 
__owur char ssl3_cbc_record_digest_supported(const EVP_MD_CTX *ctx); 
__owur int ssl3_cbc_digest_record(const EVP_MD_CTX *ctx, 
                                  unsigned char *md_out, 
                                  size_t *md_out_size, 
                                  const unsigned char header[13], 
                                  const unsigned char *data, 
                                  size_t data_plus_mac_size, 
                                  size_t data_plus_mac_plus_padding_size, 
                                  const unsigned char *mac_secret, 
                                  size_t mac_secret_length, char is_sslv3); 
 
__owur int srp_generate_server_master_secret(SSL *s); 
__owur int srp_generate_client_master_secret(SSL *s); 
__owur int srp_verify_server_param(SSL *s); 
 
/* statem/statem_srvr.c */ 
 
__owur int send_certificate_request(SSL *s); 
 
/* statem/extensions_cust.c */ 
 
custom_ext_method *custom_ext_find(const custom_ext_methods *exts, 
                                   ENDPOINT role, unsigned int ext_type, 
                                   size_t *idx); 
 
void custom_ext_init(custom_ext_methods *meths); 
 
__owur int custom_ext_parse(SSL *s, unsigned int context, unsigned int ext_type, 
                            const unsigned char *ext_data, size_t ext_size, 
                            X509 *x, size_t chainidx); 
__owur int custom_ext_add(SSL *s, int context, WPACKET *pkt, X509 *x, 
                          size_t chainidx, int maxversion); 
 
__owur int custom_exts_copy(custom_ext_methods *dst, 
                            const custom_ext_methods *src); 
__owur int custom_exts_copy_flags(custom_ext_methods *dst, 
                                  const custom_ext_methods *src); 
void custom_exts_free(custom_ext_methods *exts); 
 
void ssl_comp_free_compression_methods_int(void); 
 
/* ssl_mcnf.c */ 
void ssl_ctx_system_config(SSL_CTX *ctx); 
 
# else /* OPENSSL_UNIT_TEST */ 
 
#  define ssl_init_wbio_buffer SSL_test_functions()->p_ssl_init_wbio_buffer 
#  define ssl3_setup_buffers SSL_test_functions()->p_ssl3_setup_buffers 
 
# endif 
#endif