/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is PRIVATE to SSL and should be the first thing included by
 * any SSL implementation file.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef __sslimpl_h_
#define __sslimpl_h_

#ifdef DEBUG
#undef NDEBUG
#else
#undef NDEBUG
#define NDEBUG
#endif
#include "secport.h"
#include "secerr.h"
#include "sslerr.h"
#include "sslexp.h"
#include "ssl3prot.h"
#include "hasht.h"
#include "nssilock.h"
#include "pkcs11t.h"
#if defined(XP_UNIX) || defined(XP_BEOS)
#include "unistd.h"
#endif
#include "nssrwlk.h"
#include "prthread.h"
#include "prclist.h"
#include "private/pprthred.h"

#include "sslt.h" /* for some formerly private types, now public */

typedef struct sslSocketStr sslSocket;
typedef struct sslNamedGroupDefStr sslNamedGroupDef;
typedef struct sslEsniKeysStr sslEsniKeys;
typedef struct sslEphemeralKeyPairStr sslEphemeralKeyPair;
typedef struct TLS13KeyShareEntryStr TLS13KeyShareEntry;

#include "sslencode.h"
#include "sslexp.h"
#include "ssl3ext.h"
#include "sslspec.h"

#if defined(DEBUG) || defined(TRACE)
#ifdef __cplusplus
#define Debug 1
#else
extern int Debug;
#endif
#else
#undef Debug
#endif

#if defined(DEBUG) && !defined(TRACE) && !defined(NISCC_TEST)
#define TRACE
#endif

#ifdef TRACE
#define SSL_TRC(a, b)     \
    if (ssl_trace >= (a)) \
    ssl_Trace b
#define PRINT_BUF(a, b)   \
    if (ssl_trace >= (a)) \
    ssl_PrintBuf b
#define PRINT_KEY(a, b)   \
    if (ssl_trace >= (a)) \
    ssl_PrintKey b
#else
#define SSL_TRC(a, b)
#define PRINT_BUF(a, b)
#define PRINT_KEY(a, b)
#endif

#ifdef DEBUG
#define SSL_DBG(b) \
    if (ssl_debug) \
    ssl_Trace b
#else
#define SSL_DBG(b)
#endif

#define LSB(x) ((unsigned char)((x)&0xff))
#define MSB(x) ((unsigned char)(((unsigned)(x)) >> 8))

#define CONST_CAST(T, X) ((T *)(X))

/************************************************************************/

typedef enum { SSLAppOpRead = 0,
               SSLAppOpWrite,
               SSLAppOpRDWR,
               SSLAppOpPost,
               SSLAppOpHeader
} SSLAppOperation;

#define SSL3_SESSIONID_BYTES 32

#define SSL_MIN_CHALLENGE_BYTES 16
#define SSL_MAX_CHALLENGE_BYTES 32

#define SSL3_MASTER_SECRET_LENGTH 48

/* number of wrap mechanisms potentially used to wrap master secrets. */
#define SSL_NUM_WRAP_MECHS 15
#define SSL_NUM_WRAP_KEYS 6

/* This makes the cert cache entry exactly 4k. */
#define SSL_MAX_CACHED_CERT_LEN 4060

#ifndef BPB
#define BPB 8 /* Bits Per Byte */
#endif

/* The default value from RFC 4347 is 1s, which is too slow. */
#define DTLS_RETRANSMIT_INITIAL_MS 50
/* The maximum time to wait between retransmissions. */
#define DTLS_RETRANSMIT_MAX_MS 10000
/* Time to wait in FINISHED state for retransmissions. */
#define DTLS_RETRANSMIT_FINISHED_MS 30000

/* default number of entries in namedGroupPreferences */
#define SSL_NAMED_GROUP_COUNT 31

/* The maximum DH and RSA bit-length supported. */
#define SSL_MAX_DH_KEY_BITS 8192
#define SSL_MAX_RSA_KEY_BITS 8192

/* Types and names of elliptic curves used in TLS */
typedef enum {
    ec_type_explicitPrime = 1,      /* not supported */
    ec_type_explicitChar2Curve = 2, /* not supported */
    ec_type_named = 3
} ECType;

typedef enum {
    ticket_allow_early_data = 1,
    ticket_allow_psk_ke = 2,
    ticket_allow_psk_dhe_ke = 4,
    ticket_allow_psk_auth = 8,
    ticket_allow_psk_sign_auth = 16
} TLS13SessionTicketFlags;

struct sslNamedGroupDefStr {
    /* The name is the value that is encoded on the wire in TLS. */
    SSLNamedGroup name;
    /* The number of bits in the group. */
    unsigned int bits;
    /* The key exchange algorithm this group provides. */
    SSLKEAType keaType;
    /* The OID that identifies the group to PKCS11.  This also determines
     * whether the group is enabled in policy. */
    SECOidTag oidTag;
    /* Assume that the group is always supported. */
    PRBool assumeSupported;
};

typedef struct sslConnectInfoStr sslConnectInfo;
typedef struct sslGatherStr sslGather;
typedef struct sslSecurityInfoStr sslSecurityInfo;
typedef struct sslSessionIDStr sslSessionID;
typedef struct sslSocketOpsStr sslSocketOps;

typedef struct ssl3StateStr ssl3State;
typedef struct ssl3CertNodeStr ssl3CertNode;
typedef struct sslKeyPairStr sslKeyPair;
typedef struct ssl3DHParamsStr ssl3DHParams;

struct ssl3CertNodeStr {
    struct ssl3CertNodeStr *next;
    CERTCertificate *cert;
};

typedef SECStatus (*sslHandshakeFunc)(sslSocket *ss);

void ssl_CacheSessionID(sslSocket *ss);
void ssl_UncacheSessionID(sslSocket *ss);
void ssl_ServerCacheSessionID(sslSessionID *sid);
void ssl_ServerUncacheSessionID(sslSessionID *sid);

typedef sslSessionID *(*sslSessionIDLookupFunc)(const PRIPv6Addr *addr,
                                                unsigned char *sid,
                                                unsigned int sidLen,
                                                CERTCertDBHandle *dbHandle);

/* Socket ops */
struct sslSocketOpsStr {
    int (*connect)(sslSocket *, const PRNetAddr *);
    PRFileDesc *(*accept)(sslSocket *, PRNetAddr *);
    int (*bind)(sslSocket *, const PRNetAddr *);
    int (*listen)(sslSocket *, int);
    int (*shutdown)(sslSocket *, int);
    int (*close)(sslSocket *);

    int (*recv)(sslSocket *, unsigned char *, int, int);

    /* points to the higher-layer send func, e.g. ssl_SecureSend. */
    int (*send)(sslSocket *, const unsigned char *, int, int);
    int (*read)(sslSocket *, unsigned char *, int);
    int (*write)(sslSocket *, const unsigned char *, int);

    int (*getpeername)(sslSocket *, PRNetAddr *);
    int (*getsockname)(sslSocket *, PRNetAddr *);
};

/* Flags interpreted by ssl send functions. */
#define ssl_SEND_FLAG_FORCE_INTO_BUFFER 0x40000000
#define ssl_SEND_FLAG_NO_BUFFER 0x20000000
#define ssl_SEND_FLAG_NO_RETRANSMIT 0x08000000 /* DTLS only */
#define ssl_SEND_FLAG_MASK 0x7f000000

/*
** SSL3 cipher suite policy and preference struct.
*/
typedef struct {
#if !defined(_WIN32)
    unsigned int cipher_suite : 16;
    unsigned int policy : 8;
    unsigned int enabled : 1;
    unsigned int isPresent : 1;
#else
    ssl3CipherSuite cipher_suite;
    PRUint8 policy;
    unsigned char enabled : 1;
    unsigned char isPresent : 1;
#endif
} ssl3CipherSuiteCfg;

#define ssl_V3_SUITES_IMPLEMENTED 71

#define MAX_DTLS_SRTP_CIPHER_SUITES 4

/* MAX_SIGNATURE_SCHEMES allows for all the values we support. */
#define MAX_SIGNATURE_SCHEMES 18

typedef struct sslOptionsStr {
    /* If SSL_SetNextProtoNego has been called, then this contains the
     * list of supported protocols. */
    SECItem nextProtoNego;
    PRUint16 recordSizeLimit;

    PRUint32 maxEarlyDataSize;
    unsigned int useSecurity : 1;
    unsigned int useSocks : 1;
    unsigned int requestCertificate : 1;
    unsigned int requireCertificate : 2;
    unsigned int handshakeAsClient : 1;
    unsigned int handshakeAsServer : 1;
    unsigned int noCache : 1;
    unsigned int fdx : 1;
    unsigned int detectRollBack : 1;
    unsigned int noLocks : 1;
    unsigned int enableSessionTickets : 1;
    unsigned int enableDeflate : 1; /* Deprecated. */
    unsigned int enableRenegotiation : 2;
    unsigned int requireSafeNegotiation : 1;
    unsigned int enableFalseStart : 1;
    unsigned int cbcRandomIV : 1;
    unsigned int enableOCSPStapling : 1;
    unsigned int enableALPN : 1;
    unsigned int reuseServerECDHEKey : 1;
    unsigned int enableFallbackSCSV : 1;
    unsigned int enableServerDhe : 1;
    unsigned int enableExtendedMS : 1;
    unsigned int enableSignedCertTimestamps : 1;
    unsigned int requireDHENamedGroups : 1;
    unsigned int enable0RttData : 1;
    unsigned int enableTls13CompatMode : 1;
    unsigned int enableDtlsShortHeader : 1;
    unsigned int enableHelloDowngradeCheck : 1;
    unsigned int enableV2CompatibleHello : 1;
} sslOptions;

typedef enum { sslHandshakingUndetermined = 0,
               sslHandshakingAsClient,
               sslHandshakingAsServer
} sslHandshakingType;

#define SSL_LOCK_RANK_SPEC 255

/* These are the valid values for shutdownHow.
** These values are each 1 greater than the NSPR values, and the code
** depends on that relation to efficiently convert PR_SHUTDOWN values
** into ssl_SHUTDOWN values.  These values use one bit for read, and
** another bit for write, and can be used as bitmasks.
*/
#define ssl_SHUTDOWN_NONE 0 /* NOT shutdown at all */
#define ssl_SHUTDOWN_RCV 1  /* PR_SHUTDOWN_RCV  +1 */
#define ssl_SHUTDOWN_SEND 2 /* PR_SHUTDOWN_SEND +1 */
#define ssl_SHUTDOWN_BOTH 3 /* PR_SHUTDOWN_BOTH +1 */

/*
** A gather object. Used to read some data until a count has been
** satisfied. Primarily for support of async sockets.
** Everything in here is protected by the recvBufLock.
*/
struct sslGatherStr {
    int state; /* see GS_ values below. */

    /* "buf" holds received plaintext SSL records, after decrypt and MAC check.
     * recv'd ciphertext records are put in inbuf (see below), then decrypted
     * into buf.
     */
    sslBuffer buf; /*recvBufLock*/

    /* number of bytes previously read into hdr or inbuf.
    ** (offset - writeOffset) is the number of ciphertext bytes read in but
    **     not yet deciphered.
    */
    unsigned int offset;

    /* number of bytes to read in next call to ssl_DefRecv (recv) */
    unsigned int remainder;

    /* DoRecv uses the next two values to extract application data.
    ** The difference between writeOffset and readOffset is the amount of
    ** data available to the application.   Note that the actual offset of
    ** the data in "buf" is recordOffset (above), not readOffset.
    ** In the current implementation, this is made available before the
    ** MAC is checked!!
    */
    unsigned int readOffset; /* Spot where DATA reader (e.g. application
                               ** or handshake code) will read next.
                               ** Always zero for SSl3 application data.
                               */
    /* offset in buf/inbuf/hdr into which new data will be read from socket. */
    unsigned int writeOffset;

    /* Buffer for ssl3 to read (encrypted) data from the socket */
    sslBuffer inbuf; /*recvBufLock*/

    /* The ssl[23]_GatherData functions read data into this buffer, rather
    ** than into buf or inbuf, while in the GS_HEADER state.
    ** The portion of the SSL record header put here always comes off the wire
    ** as plaintext, never ciphertext.
    ** For SSL3/TLS, the plaintext portion is 5 bytes long. For DTLS it
    ** varies based on version and header type.
    */
    unsigned char hdr[13];
    unsigned int hdrLen;

    /* Buffer for DTLS data read off the wire as a single datagram */
    sslBuffer dtlsPacket;

    /* the start of the buffered DTLS record in dtlsPacket */
    unsigned int dtlsPacketOffset;

    /* tracks whether we've seen a v3-type record before and must reject
     * any further v2-type records. */
    PRBool rejectV2Records;
};

/* sslGather.state */
#define GS_INIT 0
#define GS_HEADER 1
#define GS_DATA 2

#define WRAPPED_MASTER_SECRET_SIZE 48

typedef struct {
    PRUint8 wrapped_master_secret[WRAPPED_MASTER_SECRET_SIZE];
    PRUint8 wrapped_master_secret_len;
    PRUint8 resumable;
    PRUint8 extendedMasterSecretUsed;
} ssl3SidKeys; /* 52 bytes */

typedef enum { never_cached,
               in_client_cache,
               in_server_cache,
               invalid_cache, /* no longer in any cache. */
               in_external_cache
} Cached;

#include "sslcert.h"

struct sslSessionIDStr {
    /* The global cache lock must be held when accessing these members when the
     * sid is in any cache.
     */
    sslSessionID *next; /* chain used for client sockets, only */
    Cached cached;
    int references;
    PRTime lastAccessTime;

    /* The rest of the members, except for the members of u.ssl3.locked, may
     * be modified only when the sid is not in any cache.
     */

    CERTCertificate *peerCert;
    SECItemArray peerCertStatus;        /* client only */
    const char *peerID;                 /* client only */
    const char *urlSvrName;             /* client only */
    const sslNamedGroupDef *namedCurve; /* (server) for certificate lookup */
    CERTCertificate *localCert;

    PRIPv6Addr addr;
    PRUint16 port;

    SSL3ProtocolVersion version;

    PRTime creationTime;
    PRTime expirationTime;

    SSLAuthType authType;
    PRUint32 authKeyBits;
    SSLKEAType keaType;
    PRUint32 keaKeyBits;
    SSLNamedGroup keaGroup;
    SSLSignatureScheme sigScheme;

    union {
        struct {
            /* values that are copied into the server's on-disk SID cache. */
            PRUint8 sessionIDLength;
            PRUint8 sessionID[SSL3_SESSIONID_BYTES];

            ssl3CipherSuite cipherSuite;
            PRUint8 policy;
            ssl3SidKeys keys;
            /* mechanism used to wrap master secret */
            CK_MECHANISM_TYPE masterWrapMech;

            /* The following values pertain to the slot that wrapped the
            ** master secret. (used only in client)
            */
            SECMODModuleID masterModuleID;
            /* what module wrapped the master secret */
            CK_SLOT_ID masterSlotID;
            PRUint16 masterWrapIndex;
            /* what's the key index for the wrapping key */
            PRUint16 masterWrapSeries;
            /* keep track of the slot series, so we don't
             * accidently try to use new keys after the
             * card gets removed and replaced.*/

            /* The following values pertain to the slot that did the signature
            ** for client auth.   (used only in client)
            */
            SECMODModuleID clAuthModuleID;
            CK_SLOT_ID clAuthSlotID;
            PRUint16 clAuthSeries;

            char masterValid;
            char clAuthValid;

            SECItem srvName;

            /* Signed certificate timestamps received in a TLS extension.
            ** (used only in client).
            */
            SECItem signedCertTimestamps;

            /* The ALPN value negotiated in the original connection.
             * Used for TLS 1.3. */
            SECItem alpnSelection;

            /* This lock is lazily initialized by CacheSID when a sid is first
             * cached. Before then, there is no need to lock anything because
             * the sid isn't being shared by anything.
             */
            PRRWLock *lock;

            /* The lock must be held while reading or writing these members
             * because they change while the sid is cached.
             */
            struct {
                /* The session ticket, if we have one, is sent as an extension
                 * in the ClientHello message. This field is used only by
                 * clients. It is protected by lock when lock is non-null
                 * (after the sid has been added to the client session cache).
                 */
                NewSessionTicket sessionTicket;
            } locked;
        } ssl3;
    } u;
};

struct ssl3CipherSuiteDefStr {
    ssl3CipherSuite cipher_suite;
    SSL3BulkCipher bulk_cipher_alg;
    SSL3MACAlgorithm mac_alg;
    SSL3KeyExchangeAlgorithm key_exchange_alg;
    SSLHashType prf_hash;
};

/*
** There are tables of these, all const.
*/
typedef struct {
    /* An identifier for this struct. */
    SSL3KeyExchangeAlgorithm kea;
    /* The type of key exchange used by the cipher suite. */
    SSLKEAType exchKeyType;
    /* If the cipher suite uses a signature, the type of key used in the
     * signature. */
    KeyType signKeyType;
    /* In most cases, cipher suites depend on their signature type for
     * authentication, ECDH certificates being the exception. */
    SSLAuthType authKeyType;
    /* True if the key exchange for the suite is ephemeral.  Or to be more
     * precise: true if the ServerKeyExchange message is always required. */
    PRBool ephemeral;
    /* An OID describing the key exchange */
    SECOidTag oid;
} ssl3KEADef;

typedef enum {
    ssl_0rtt_none,     /* 0-RTT not present */
    ssl_0rtt_sent,     /* 0-RTT sent (no decision yet) */
    ssl_0rtt_accepted, /* 0-RTT sent and accepted */
    ssl_0rtt_ignored,  /* 0-RTT sent but rejected/ignored */
    ssl_0rtt_done      /* 0-RTT accepted, but finished */
} sslZeroRttState;

typedef enum {
    ssl_0rtt_ignore_none,  /* not ignoring */
    ssl_0rtt_ignore_trial, /* ignoring with trial decryption */
    ssl_0rtt_ignore_hrr    /* ignoring until ClientHello (due to HRR) */
} sslZeroRttIgnore;

typedef enum {
    idle_handshake,
    wait_client_hello,
    wait_end_of_early_data,
    wait_client_cert,
    wait_client_key,
    wait_cert_verify,
    wait_change_cipher,
    wait_finished,
    wait_server_hello,
    wait_certificate_status,
    wait_server_cert,
    wait_server_key,
    wait_cert_request,
    wait_hello_done,
    wait_new_session_ticket,
    wait_encrypted_extensions,
    wait_invalid /* Invalid value. There is no handshake message "invalid". */
} SSL3WaitState;

typedef enum {
    client_hello_initial,      /* The first attempt. */
    client_hello_retry,        /* If we receive HelloRetryRequest. */
    client_hello_retransmit,   /* In DTLS, if we receive HelloVerifyRequest. */
    client_hello_renegotiation /* A renegotiation attempt. */
} sslClientHelloType;

typedef struct SessionTicketDataStr SessionTicketData;

typedef SECStatus (*sslRestartTarget)(sslSocket *);

/*
** A DTLS queued message (potentially to be retransmitted)
*/
typedef struct DTLSQueuedMessageStr {
    PRCList link;           /* The linked list link */
    ssl3CipherSpec *cwSpec; /* The cipher spec to use, null for none */
    SSLContentType type;    /* The message type */
    unsigned char *data;    /* The data */
    PRUint16 len;           /* The data length */
} DTLSQueuedMessage;

struct TLS13KeyShareEntryStr {
    PRCList link;                  /* The linked list link */
    const sslNamedGroupDef *group; /* The group for the entry */
    SECItem key_exchange;          /* The share itself */
};

typedef struct TLS13EarlyDataStr {
    PRCList link; /* The linked list link */
    SECItem data; /* The data */
} TLS13EarlyData;

typedef enum {
    handshake_hash_unknown = 0,
    handshake_hash_combo = 1,  /* The MD5/SHA-1 combination */
    handshake_hash_single = 2, /* A single hash */
    handshake_hash_record
} SSL3HandshakeHashType;

// A DTLS Timer.
typedef void (*DTLSTimerCb)(sslSocket *);

typedef struct {
    const char *label;
    DTLSTimerCb cb;
    PRIntervalTime started;
    PRUint32 timeout;
} dtlsTimer;

/*
** This is the "hs" member of the "ssl3" struct.
** This entire struct is protected by ssl3HandshakeLock
*/
typedef struct SSL3HandshakeStateStr {
    SSL3Random server_random;
    SSL3Random client_random;
    SSL3WaitState ws; /* May also contain SSL3WaitState | 0x80 for TLS 1.3 */

    /* This group of members is used for handshake running hashes. */
    SSL3HandshakeHashType hashType;
    sslBuffer messages; /* Accumulated handshake messages */
    /* PKCS #11 mode:
     * SSL 3.0 - TLS 1.1 use both |md5| and |sha|. |md5| is used for MD5 and
     * |sha| for SHA-1.
     * TLS 1.2 and later use only |sha|, for SHA-256. */
    PK11Context *md5;
    PK11Context *sha;
    SSLSignatureScheme signatureScheme;
    const ssl3KEADef *kea_def;
    ssl3CipherSuite cipher_suite;
    const ssl3CipherSuiteDef *suite_def;
    sslBuffer msg_body; /* protected by recvBufLock */
                        /* partial handshake message from record layer */
    unsigned int header_bytes;
    /* number of bytes consumed from handshake */
    /* message for message type and header length */
    SSLHandshakeType msg_type;
    unsigned long msg_len;
    PRBool isResuming;  /* we are resuming (not used in TLS 1.3) */
    PRBool sendingSCSV; /* instead of empty RI */
    sslBuffer msgState; /* current state for handshake messages*/
                        /* protected by recvBufLock */

    /* The session ticket received in a NewSessionTicket message is temporarily
     * stored in newSessionTicket until the handshake is finished; then it is
     * moved to the sid.
     */
    PRBool receivedNewSessionTicket;
    NewSessionTicket newSessionTicket;

    PRUint16 finishedBytes; /* size of single finished below */
    union {
        TLSFinished tFinished[2]; /* client, then server */
        SSL3Finished sFinished[2];
        PRUint8 data[72];
    } finishedMsgs;

    PRBool authCertificatePending;
    /* Which function should SSL_RestartHandshake* call if we're blocked?
     * One of NULL, ssl3_SendClientSecondRound, ssl3_FinishHandshake,
     * or ssl3_AlwaysFail */
    sslRestartTarget restartTarget;
    /* Shared state between ssl3_HandleFinished and ssl3_FinishHandshake */
    PRBool cacheSID;

    PRBool canFalseStart; /* Can/did we False Start */
    /* Which preliminaryinfo values have been set. */
    PRUint32 preliminaryInfo;

    /* Parsed extensions */
    PRCList remoteExtensions; /* Parsed incoming extensions */

    /* This group of values is used for DTLS */
    PRUint16 sendMessageSeq;   /* The sending message sequence
                                    * number */
    PRCList lastMessageFlight; /* The last message flight we
                                    * sent */
    PRUint16 maxMessageSent;   /* The largest message we sent */
    PRUint16 recvMessageSeq;   /* The receiving message sequence
                                    * number */
    sslBuffer recvdFragments;  /* The fragments we have received in
                                    * a bitmask */
    PRInt32 recvdHighWater;    /* The high water mark for fragments
                                    * received. -1 means no reassembly
                                    * in progress. */
    SECItem cookie;            /* The Hello(Retry|Verify)Request cookie. */
    dtlsTimer timers[3];       /* Holder for timers. */
    dtlsTimer *rtTimer;        /* Retransmit timer. */
    dtlsTimer *ackTimer;       /* Ack timer (DTLS 1.3 only). */
    dtlsTimer *hdTimer;        /* Read cipher holddown timer (DLTS 1.3 only) */
    PRUint32 rtRetries;        /* The retry counter */
    SECItem srvVirtName;       /* for server: name that was negotiated
                                    * with a client. For client - is
                                    * always set to NULL.*/

    /* This group of values is used for TLS 1.3 and above */
    PK11SymKey *currentSecret;            /* The secret down the "left hand side"
                                           * of the TLS 1.3 key schedule. */
    PK11SymKey *resumptionMasterSecret;   /* The resumption PSK. */
    PK11SymKey *dheSecret;                /* The (EC)DHE shared secret. */
    PK11SymKey *pskBinderKey;             /* Used to compute the PSK binder. */
    PK11SymKey *clientEarlyTrafficSecret; /* The secret we use for 0-RTT. */
    PK11SymKey *clientHsTrafficSecret;    /* The source keys for handshake */
    PK11SymKey *serverHsTrafficSecret;    /* traffic keys. */
    PK11SymKey *clientTrafficSecret;      /* The source keys for application */
    PK11SymKey *serverTrafficSecret;      /* traffic keys */
    PK11SymKey *earlyExporterSecret;      /* for 0-RTT exporters */
    PK11SymKey *exporterSecret;           /* for exporters */
    PRCList cipherSpecs;                  /* The cipher specs in the sequence they
                                           * will be applied. */
    sslZeroRttState zeroRttState;         /* Are we doing a 0-RTT handshake? */
    sslZeroRttIgnore zeroRttIgnore;       /* Are we ignoring 0-RTT? */
    ssl3CipherSuite zeroRttSuite;         /* The cipher suite we used for 0-RTT. */
    PRCList bufferedEarlyData;            /* Buffered TLS 1.3 early data
                                           * on server.*/
    PRBool helloRetry;                    /* True if HelloRetryRequest has been sent
                                           * or received. */
    PRBool receivedCcs;                   /* A server received ChangeCipherSpec
                                           * before the handshake started. */
    PRBool clientCertRequested;           /* True if CertificateRequest received. */
    ssl3KEADef kea_def_mutable;           /* Used to hold the writable kea_def
                                           * we use for TLS 1.3 */
    PRTime serverHelloTime;               /* Time the ServerHello flight was sent. */
    PRUint16 ticketNonce;                 /* A counter we use for tickets. */
    SECItem fakeSid;                      /* ... (server) the SID the client used. */
    PRBool endOfFlight;                   /* Processed a full flight (DTLS 1.3). */

    /* The following lists contain DTLSHandshakeRecordEntry */
    PRCList dtlsSentHandshake; /* Used to map records to handshake fragments. */
    PRCList dtlsRcvdHandshake; /* Handshake records we have received
                                * used to generate ACKs. */
} SSL3HandshakeState;

#define SSL_ASSERT_HASHES_EMPTY(ss)                                  \
    do {                                                             \
        PORT_Assert(ss->ssl3.hs.hashType == handshake_hash_unknown); \
        PORT_Assert(ss->ssl3.hs.messages.len == 0);                  \
    } while (0)

/*
** This is the "ssl3" struct, as in "ss->ssl3".
** note:
** usually,   crSpec == cwSpec and prSpec == pwSpec.
** Sometimes, crSpec == pwSpec and prSpec == cwSpec.
** But there are never more than 2 actual specs.
** No spec must ever be modified if either "current" pointer points to it.
*/
struct ssl3StateStr {

    /*
    ** The following Specs and Spec pointers must be protected using the
    ** Spec Lock.
    */
    ssl3CipherSpec *crSpec; /* current read spec. */
    ssl3CipherSpec *prSpec; /* pending read spec. */
    ssl3CipherSpec *cwSpec; /* current write spec. */
    ssl3CipherSpec *pwSpec; /* pending write spec. */

    /* This is true after the peer requests a key update; false after a key
     * update is initiated locally. */
    PRBool peerRequestedKeyUpdate;

    /* Internal callback for when we do a cipher suite change. Used for
     * debugging in TLS 1.3. This can only be set by non-public functions. */
    sslCipherSpecChangedFunc changedCipherSpecFunc;
    void *changedCipherSpecArg;

    CERTCertificate *clientCertificate;   /* used by client */
    SECKEYPrivateKey *clientPrivateKey;   /* used by client */
    CERTCertificateList *clientCertChain; /* used by client */
    PRBool sendEmptyCert;                 /* used by client */

    PRUint8 policy;
    /* This says what cipher suites we can do, and should
     * be either SSL_ALLOWED or SSL_RESTRICTED
     */
    PLArenaPool *peerCertArena;
    /* These are used to keep track of the peer CA */
    void *peerCertChain;
    /* chain while we are trying to validate it.   */
    CERTDistNames *ca_list;
    /* used by server.  trusted CAs for this socket. */
    SSL3HandshakeState hs;

    PRUint16 mtu; /* Our estimate of the MTU */

    /* DTLS-SRTP cipher suite preferences (if any) */
    PRUint16 dtlsSRTPCiphers[MAX_DTLS_SRTP_CIPHER_SUITES];
    PRUint16 dtlsSRTPCipherCount;
    PRBool fatalAlertSent;
    PRBool dheWeakGroupEnabled; /* used by server */
    const sslNamedGroupDef *dhePreferredGroup;

    /* TLS 1.2 introduces separate signature algorithm negotiation.
     * TLS 1.3 combined signature and hash into a single enum.
     * This is our preference order. */
    SSLSignatureScheme signatureSchemes[MAX_SIGNATURE_SCHEMES];
    unsigned int signatureSchemeCount;

    /* The version to check if we fell back from our highest version
     * of TLS. Default is 0 in which case we check against the maximum
     * configured version for this socket. Used only on the client. */
    SSL3ProtocolVersion downgradeCheckVersion;
};

/* Ethernet MTU but without subtracting the headers,
 * so slightly larger than expected */
#define DTLS_MAX_MTU 1500U
#define IS_DTLS(ss) (ss->protocolVariant == ssl_variant_datagram)

typedef struct {
    /* |seqNum| eventually contains the reconstructed sequence number. */
    sslSequenceNumber seqNum;
    /* The header of the cipherText. */
    const PRUint8 *hdr;
    unsigned int hdrLen;

    /* |buf| is the payload of the ciphertext. */
    sslBuffer *buf;
} SSL3Ciphertext;

struct sslKeyPairStr {
    SECKEYPrivateKey *privKey;
    SECKEYPublicKey *pubKey;
    PRInt32 refCount; /* use PR_Atomic calls for this. */
};

struct sslEphemeralKeyPairStr {
    PRCList link;
    const sslNamedGroupDef *group;
    sslKeyPair *keys;
};

struct ssl3DHParamsStr {
    SSLNamedGroup name;
    SECItem prime; /* p */
    SECItem base;  /* g */
};

typedef struct SSLWrappedSymWrappingKeyStr {
    PRUint8 wrappedSymmetricWrappingkey[SSL_MAX_RSA_KEY_BITS / 8];
    CK_MECHANISM_TYPE symWrapMechanism;
    /* unwrapped symmetric wrapping key uses this mechanism */
    CK_MECHANISM_TYPE asymWrapMechanism;
    /* mechanism used to wrap the SymmetricWrappingKey using
     * server's public and/or private keys. */
    PRInt16 wrapMechIndex;
    PRUint16 wrapKeyIndex;
    PRUint16 wrappedSymKeyLen;
} SSLWrappedSymWrappingKey;

typedef struct SessionTicketStr {
    PRBool valid;
    SSL3ProtocolVersion ssl_version;
    ssl3CipherSuite cipher_suite;
    SSLAuthType authType;
    PRUint32 authKeyBits;
    SSLKEAType keaType;
    PRUint32 keaKeyBits;
    SSLNamedGroup originalKeaGroup;
    SSLSignatureScheme signatureScheme;
    const sslNamedGroupDef *namedCurve; /* For certificate lookup. */

    /*
     * msWrapMech contains a meaningful value only if ms_is_wrapped is true.
     */
    PRUint8 ms_is_wrapped;
    CK_MECHANISM_TYPE msWrapMech;
    PRUint16 ms_length;
    PRUint8 master_secret[48];
    PRBool extendedMasterSecretUsed;
    ClientAuthenticationType client_auth_type;
    SECItem peer_cert;
    PRTime timestamp;
    PRUint32 flags;
    SECItem srvName; /* negotiated server name */
    SECItem alpnSelection;
    PRUint32 maxEarlyData;
    PRUint32 ticketAgeBaseline;
    SECItem applicationToken;
} SessionTicket;

/*
 * SSL2 buffers used in SSL3.
 *     writeBuf in the SecurityInfo maintained by sslsecur.c is used
 *              to hold the data just about to be passed to the kernel
 *     sendBuf in the ConnectInfo maintained by sslcon.c is used
 *              to hold handshake messages as they are accumulated
 */

/*
** This is "ci", as in "ss->sec.ci".
**
** Protection:  All the variables in here are protected by
** firstHandshakeLock AND ssl3HandshakeLock
*/
struct sslConnectInfoStr {
    /* outgoing handshakes appended to this. */
    sslBuffer sendBuf; /*xmitBufLock*/

    PRIPv6Addr peer;
    unsigned short port;

    sslSessionID *sid;
};

/* Note: The entire content of this struct and whatever it points to gets
 * blown away by SSL_ResetHandshake().  This is "sec" as in "ss->sec".
 *
 * Unless otherwise specified below, the contents of this struct are
 * protected by firstHandshakeLock AND ssl3HandshakeLock.
 */
struct sslSecurityInfoStr {

#define SSL_ROLE(ss) (ss->sec.isServer ? "server" : "client")

    PRBool isServer;
    sslBuffer writeBuf; /*xmitBufLock*/

    CERTCertificate *localCert;
    CERTCertificate *peerCert;
    SECKEYPublicKey *peerKey;

    SSLAuthType authType;
    PRUint32 authKeyBits;
    SSLSignatureScheme signatureScheme;
    SSLKEAType keaType;
    PRUint32 keaKeyBits;
    const sslNamedGroupDef *keaGroup;
    const sslNamedGroupDef *originalKeaGroup;
    /* The selected certificate (for servers only). */
    const sslServerCert *serverCert;

    /* These are used during a connection handshake */
    sslConnectInfo ci;
};

/*
** SSL Socket struct
**
** Protection:  XXX
*/
struct sslSocketStr {
    PRFileDesc *fd;

    /* Pointer to operations vector for this socket */
    const sslSocketOps *ops;

    /* SSL socket options */
    sslOptions opt;
    /* Enabled version range */
    SSLVersionRange vrange;

    /* State flags */
    unsigned long clientAuthRequested;
    unsigned long delayDisabled;     /* Nagle delay disabled */
    unsigned long firstHsDone;       /* first handshake is complete. */
    unsigned long enoughFirstHsDone; /* enough of the first handshake is
                                      * done for callbacks to be able to
                                      * retrieve channel security
                                      * parameters from the SSL socket. */
    unsigned long handshakeBegun;
    unsigned long lastWriteBlocked;
    unsigned long recvdCloseNotify; /* received SSL EOF. */
    unsigned long TCPconnected;
    unsigned long appDataBuffered;
    unsigned long peerRequestedProtection; /* from old renegotiation */

    /* version of the protocol to use */
    SSL3ProtocolVersion version;
    SSL3ProtocolVersion clientHelloVersion; /* version sent in client hello. */

    sslSecurityInfo sec; /* not a pointer any more */

    /* protected by firstHandshakeLock AND ssl3HandshakeLock. */
    const char *url;

    sslHandshakeFunc handshake; /*firstHandshakeLock*/

    /* the following variable is only used with socks or other proxies. */
    char *peerID; /* String uniquely identifies target server. */

    /* ECDHE and DHE keys: In TLS 1.3, we might have to maintain multiple of
     * these on the client side.  The server inserts a single value into this
     * list for all versions. */
    PRCList /*<sslEphemeralKeyPair>*/ ephemeralKeyPairs;

    /* Callbacks */
    SSLAuthCertificate authCertificate;
    void *authCertificateArg;
    SSLGetClientAuthData getClientAuthData;
    void *getClientAuthDataArg;
    SSLSNISocketConfig sniSocketConfig;
    void *sniSocketConfigArg;
    SSLAlertCallback alertReceivedCallback;
    void *alertReceivedCallbackArg;
    SSLAlertCallback alertSentCallback;
    void *alertSentCallbackArg;
    SSLBadCertHandler handleBadCert;
    void *badCertArg;
    SSLHandshakeCallback handshakeCallback;
    void *handshakeCallbackData;
    SSLCanFalseStartCallback canFalseStartCallback;
    void *canFalseStartCallbackData;
    void *pkcs11PinArg;
    SSLNextProtoCallback nextProtoCallback;
    void *nextProtoArg;
    SSLHelloRetryRequestCallback hrrCallback;
    void *hrrCallbackArg;
    PRCList extensionHooks;
    SSLResumptionTokenCallback resumptionTokenCallback;
    void *resumptionTokenContext;

    PRIntervalTime rTimeout; /* timeout for NSPR I/O */
    PRIntervalTime wTimeout; /* timeout for NSPR I/O */
    PRIntervalTime cTimeout; /* timeout for NSPR I/O */

    PZLock *recvLock; /* lock against multiple reader threads. */
    PZLock *sendLock; /* lock against multiple sender threads. */

    PZMonitor *recvBufLock; /* locks low level recv buffers. */
    PZMonitor *xmitBufLock; /* locks low level xmit buffers. */

    /* Only one thread may operate on the socket until the initial handshake
    ** is complete.  This Monitor ensures that.  Since SSL2 handshake is
    ** only done once, this is also effectively the SSL2 handshake lock.
    */
    PZMonitor *firstHandshakeLock;

    /* This monitor protects the ssl3 handshake state machine data.
    ** Only one thread (reader or writer) may be in the ssl3 handshake state
    ** machine at any time.  */
    PZMonitor *ssl3HandshakeLock;

    /* reader/writer lock, protects the secret data needed to encrypt and MAC
    ** outgoing records, and to decrypt and MAC check incoming ciphertext
    ** records.  */
    NSSRWLock *specLock;

    /* handle to perm cert db (and implicitly to the temp cert db) used
    ** with this socket.
    */
    CERTCertDBHandle *dbHandle;

    PRThread *writerThread; /* thread holds SSL_LOCK_WRITER lock */

    PRUint16 shutdownHow; /* See ssl_SHUTDOWN defines below. */

    sslHandshakingType handshaking;

    /* Gather object used for gathering data */
    sslGather gs; /*recvBufLock*/

    sslBuffer saveBuf;    /*xmitBufLock*/
    sslBuffer pendingBuf; /*xmitBufLock*/

    /* Configuration state for server sockets */
    /* One server cert and key for each authentication type. */
    PRCList /* <sslServerCert> */ serverCerts;

    ssl3CipherSuiteCfg cipherSuites[ssl_V3_SUITES_IMPLEMENTED];

    /* A list of groups that are sorted according to user preferences pointing
     * to entries of ssl_named_groups. By default this list contains pointers
     * to all elements in ssl_named_groups in the default order.
     * This list also determines which groups are enabled. This
     * starts with all being enabled and can be modified either by negotiation
     * (in which case groups not supported by a peer are masked off), or by
     * calling SSL_DHEGroupPrefSet().
     * Note that renegotiation will ignore groups that were disabled in the
     * first handshake.
     */
    const sslNamedGroupDef *namedGroupPreferences[SSL_NAMED_GROUP_COUNT];
    /* The number of additional shares to generate for the TLS 1.3 ClientHello */
    unsigned int additionalShares;

    /* SSL3 state info.  Formerly was a pointer */
    ssl3State ssl3;

    /*
     * TLS extension related data.
     */
    /* True when the current session is a stateless resume. */
    PRBool statelessResume;
    TLSExtensionData xtnData;

    /* Whether we are doing stream or datagram mode */
    SSLProtocolVariant protocolVariant;

    /* The information from the ESNI keys record
     * (also the private key for the server). */
    sslEsniKeys *esniKeys;
};

struct sslSelfEncryptKeysStr {
    PRCallOnceType setup;
    PRUint8 keyName[SELF_ENCRYPT_KEY_NAME_LEN];
    PK11SymKey *encKey;
    PK11SymKey *macKey;
};
typedef struct sslSelfEncryptKeysStr sslSelfEncryptKeys;

extern char ssl_debug;
extern char ssl_trace;
extern FILE *ssl_trace_iob;
extern FILE *ssl_keylog_iob;
extern PZLock *ssl_keylog_lock;
extern PRUint32 ssl3_sid_timeout;
extern PRUint32 ssl_ticket_lifetime;

extern const char *const ssl3_cipherName[];

extern sslSessionIDLookupFunc ssl_sid_lookup;

extern const sslNamedGroupDef ssl_named_groups[];

/************************************************************************/

SEC_BEGIN_PROTOS

/* Internal initialization and installation of the SSL error tables */
extern SECStatus ssl_Init(void);
extern SECStatus ssl_InitializePRErrorTable(void);

/* Implementation of ops for default (non socks, non secure) case */
extern int ssl_DefConnect(sslSocket *ss, const PRNetAddr *addr);
extern PRFileDesc *ssl_DefAccept(sslSocket *ss, PRNetAddr *addr);
extern int ssl_DefBind(sslSocket *ss, const PRNetAddr *addr);
extern int ssl_DefListen(sslSocket *ss, int backlog);
extern int ssl_DefShutdown(sslSocket *ss, int how);
extern int ssl_DefClose(sslSocket *ss);
extern int ssl_DefRecv(sslSocket *ss, unsigned char *buf, int len, int flags);
extern int ssl_DefSend(sslSocket *ss, const unsigned char *buf,
                       int len, int flags);
extern int ssl_DefRead(sslSocket *ss, unsigned char *buf, int len);
extern int ssl_DefWrite(sslSocket *ss, const unsigned char *buf, int len);
extern int ssl_DefGetpeername(sslSocket *ss, PRNetAddr *name);
extern int ssl_DefGetsockname(sslSocket *ss, PRNetAddr *name);
extern int ssl_DefGetsockopt(sslSocket *ss, PRSockOption optname,
                             void *optval, PRInt32 *optlen);
extern int ssl_DefSetsockopt(sslSocket *ss, PRSockOption optname,
                             const void *optval, PRInt32 optlen);

/* Implementation of ops for socks only case */
extern int ssl_SocksConnect(sslSocket *ss, const PRNetAddr *addr);
extern PRFileDesc *ssl_SocksAccept(sslSocket *ss, PRNetAddr *addr);
extern int ssl_SocksBind(sslSocket *ss, const PRNetAddr *addr);
extern int ssl_SocksListen(sslSocket *ss, int backlog);
extern int ssl_SocksGetsockname(sslSocket *ss, PRNetAddr *name);
extern int ssl_SocksRecv(sslSocket *ss, unsigned char *buf, int len, int flags);
extern int ssl_SocksSend(sslSocket *ss, const unsigned char *buf,
                         int len, int flags);
extern int ssl_SocksRead(sslSocket *ss, unsigned char *buf, int len);
extern int ssl_SocksWrite(sslSocket *ss, const unsigned char *buf, int len);

/* Implementation of ops for secure only case */
extern int ssl_SecureConnect(sslSocket *ss, const PRNetAddr *addr);
extern PRFileDesc *ssl_SecureAccept(sslSocket *ss, PRNetAddr *addr);
extern int ssl_SecureRecv(sslSocket *ss, unsigned char *buf,
                          int len, int flags);
extern int ssl_SecureSend(sslSocket *ss, const unsigned char *buf,
                          int len, int flags);
extern int ssl_SecureRead(sslSocket *ss, unsigned char *buf, int len);
extern int ssl_SecureWrite(sslSocket *ss, const unsigned char *buf, int len);
extern int ssl_SecureShutdown(sslSocket *ss, int how);
extern int ssl_SecureClose(sslSocket *ss);

/* Implementation of ops for secure socks case */
extern int ssl_SecureSocksConnect(sslSocket *ss, const PRNetAddr *addr);
extern PRFileDesc *ssl_SecureSocksAccept(sslSocket *ss, PRNetAddr *addr);
extern PRFileDesc *ssl_FindTop(sslSocket *ss);

/* Gather funcs. */
extern sslGather *ssl_NewGather(void);
extern SECStatus ssl3_InitGather(sslGather *gs);
extern void ssl3_DestroyGather(sslGather *gs);
extern SECStatus ssl_GatherRecord1stHandshake(sslSocket *ss);

extern SECStatus ssl_CreateSecurityInfo(sslSocket *ss);
extern SECStatus ssl_CopySecurityInfo(sslSocket *ss, sslSocket *os);
extern void ssl_ResetSecurityInfo(sslSecurityInfo *sec, PRBool doMemset);
extern void ssl_DestroySecurityInfo(sslSecurityInfo *sec);

extern void ssl_PrintBuf(const sslSocket *ss, const char *msg, const void *cp,
                         int len);
extern void ssl_PrintKey(const sslSocket *ss, const char *msg, PK11SymKey *key);

extern int ssl_SendSavedWriteData(sslSocket *ss);
extern SECStatus ssl_SaveWriteData(sslSocket *ss,
                                   const void *p, unsigned int l);
extern SECStatus ssl_BeginClientHandshake(sslSocket *ss);
extern SECStatus ssl_BeginServerHandshake(sslSocket *ss);
extern int ssl_Do1stHandshake(sslSocket *ss);

extern SECStatus ssl3_InitPendingCipherSpecs(sslSocket *ss, PK11SymKey *secret,
                                             PRBool derive);
extern void ssl_DestroyKeyMaterial(ssl3KeyMaterial *keyMaterial);
extern sslSessionID *ssl3_NewSessionID(sslSocket *ss, PRBool is_server);
extern sslSessionID *ssl_LookupSID(const PRIPv6Addr *addr, PRUint16 port,
                                   const char *peerID, const char *urlSvrName);
extern void ssl_FreeSID(sslSessionID *sid);
extern void ssl_DestroySID(sslSessionID *sid, PRBool freeIt);
extern sslSessionID *ssl_ReferenceSID(sslSessionID *sid);

extern int ssl3_SendApplicationData(sslSocket *ss, const PRUint8 *in,
                                    int len, int flags);

extern PRBool ssl_FdIsBlocking(PRFileDesc *fd);

extern PRBool ssl_SocketIsBlocking(sslSocket *ss);

extern void ssl3_SetAlwaysBlock(sslSocket *ss);

extern SECStatus ssl_EnableNagleDelay(sslSocket *ss, PRBool enabled);

extern void ssl_FinishHandshake(sslSocket *ss);

extern SECStatus ssl_CipherPolicySet(PRInt32 which, PRInt32 policy);

extern SECStatus ssl_CipherPrefSetDefault(PRInt32 which, PRBool enabled);

extern SECStatus ssl3_ConstrainRangeByPolicy(void);

extern SECStatus ssl3_InitState(sslSocket *ss);
extern SECStatus Null_Cipher(void *ctx, unsigned char *output, int *outputLen,
                             int maxOutputLen, const unsigned char *input,
                             int inputLen);
extern void ssl3_RestartHandshakeHashes(sslSocket *ss);
extern SECStatus ssl3_UpdateHandshakeHashes(sslSocket *ss,
                                            const unsigned char *b,
                                            unsigned int l);
SECStatus
ssl_HashHandshakeMessageInt(sslSocket *ss, SSLHandshakeType type,
                            PRUint32 dtlsSeq,
                            const PRUint8 *b, PRUint32 length);
SECStatus ssl_HashHandshakeMessage(sslSocket *ss, SSLHandshakeType type,
                                   const PRUint8 *b, PRUint32 length);

/* Returns PR_TRUE if we are still waiting for the server to complete its
 * response to our client second round. Once we've received the Finished from
 * the server then there is no need to check false start.
 */
extern PRBool ssl3_WaitingForServerSecondRound(sslSocket *ss);

extern PRInt32 ssl3_SendRecord(sslSocket *ss, ssl3CipherSpec *cwSpec,
                               SSLContentType type,
                               const PRUint8 *pIn, PRInt32 nIn,
                               PRInt32 flags);

/* Clear any PRCList, optionally calling f on the value. */
void ssl_ClearPRCList(PRCList *list, void (*f)(void *));

/*
 * Make sure there is room in the write buffer for padding and
 * cryptographic expansions.
 */
#define SSL3_BUFFER_FUDGE 100

#define SSL_LOCK_READER(ss) \
    if (ss->recvLock)       \
    PZ_Lock(ss->recvLock)
#define SSL_UNLOCK_READER(ss) \
    if (ss->recvLock)         \
    PZ_Unlock(ss->recvLock)
#define SSL_LOCK_WRITER(ss) \
    if (ss->sendLock)       \
    PZ_Lock(ss->sendLock)
#define SSL_UNLOCK_WRITER(ss) \
    if (ss->sendLock)         \
    PZ_Unlock(ss->sendLock)

/* firstHandshakeLock -> recvBufLock */
#define ssl_Get1stHandshakeLock(ss)                               \
    {                                                             \
        if (!ss->opt.noLocks) {                                   \
            PORT_Assert(PZ_InMonitor((ss)->firstHandshakeLock) || \
                        !ssl_HaveRecvBufLock(ss));                \
            PZ_EnterMonitor((ss)->firstHandshakeLock);            \
        }                                                         \
    }
#define ssl_Release1stHandshakeLock(ss)               \
    {                                                 \
        if (!ss->opt.noLocks)                         \
            PZ_ExitMonitor((ss)->firstHandshakeLock); \
    }
#define ssl_Have1stHandshakeLock(ss) \
    (PZ_InMonitor((ss)->firstHandshakeLock))

/* ssl3HandshakeLock -> xmitBufLock */
#define ssl_GetSSL3HandshakeLock(ss)                  \
    {                                                 \
        if (!ss->opt.noLocks) {                       \
            PORT_Assert(!ssl_HaveXmitBufLock(ss));    \
            PZ_EnterMonitor((ss)->ssl3HandshakeLock); \
        }                                             \
    }
#define ssl_ReleaseSSL3HandshakeLock(ss)             \
    {                                                \
        if (!ss->opt.noLocks)                        \
            PZ_ExitMonitor((ss)->ssl3HandshakeLock); \
    }
#define ssl_HaveSSL3HandshakeLock(ss) \
    (PZ_InMonitor((ss)->ssl3HandshakeLock))

#define ssl_GetSpecReadLock(ss)                 \
    {                                           \
        if (!ss->opt.noLocks)                   \
            NSSRWLock_LockRead((ss)->specLock); \
    }
#define ssl_ReleaseSpecReadLock(ss)               \
    {                                             \
        if (!ss->opt.noLocks)                     \
            NSSRWLock_UnlockRead((ss)->specLock); \
    }
/* NSSRWLock_HaveReadLock is not exported so there's no
 * ssl_HaveSpecReadLock macro. */

#define ssl_GetSpecWriteLock(ss)                 \
    {                                            \
        if (!ss->opt.noLocks)                    \
            NSSRWLock_LockWrite((ss)->specLock); \
    }
#define ssl_ReleaseSpecWriteLock(ss)               \
    {                                              \
        if (!ss->opt.noLocks)                      \
            NSSRWLock_UnlockWrite((ss)->specLock); \
    }
#define ssl_HaveSpecWriteLock(ss) \
    (NSSRWLock_HaveWriteLock((ss)->specLock))

/* recvBufLock -> ssl3HandshakeLock -> xmitBufLock */
#define ssl_GetRecvBufLock(ss)                           \
    {                                                    \
        if (!ss->opt.noLocks) {                          \
            PORT_Assert(!ssl_HaveSSL3HandshakeLock(ss)); \
            PORT_Assert(!ssl_HaveXmitBufLock(ss));       \
            PZ_EnterMonitor((ss)->recvBufLock);          \
        }                                                \
    }
#define ssl_ReleaseRecvBufLock(ss)             \
    {                                          \
        if (!ss->opt.noLocks)                  \
            PZ_ExitMonitor((ss)->recvBufLock); \
    }
#define ssl_HaveRecvBufLock(ss) \
    (PZ_InMonitor((ss)->recvBufLock))

/* xmitBufLock -> specLock */
#define ssl_GetXmitBufLock(ss)                  \
    {                                           \
        if (!ss->opt.noLocks)                   \
            PZ_EnterMonitor((ss)->xmitBufLock); \
    }
#define ssl_ReleaseXmitBufLock(ss)             \
    {                                          \
        if (!ss->opt.noLocks)                  \
            PZ_ExitMonitor((ss)->xmitBufLock); \
    }
#define ssl_HaveXmitBufLock(ss) \
    (PZ_InMonitor((ss)->xmitBufLock))

/* Placeholder value used in version ranges when SSL 3.0 and all
 * versions of TLS are disabled.
 */
#define SSL_LIBRARY_VERSION_NONE 0

/* SSL_LIBRARY_VERSION_MIN_SUPPORTED is the minimum version that this version
 * of libssl supports. Applications should use SSL_VersionRangeGetSupported at
 * runtime to determine which versions are supported by the version of libssl
 * in use.
 */
#define SSL_LIBRARY_VERSION_MIN_SUPPORTED_DATAGRAM SSL_LIBRARY_VERSION_TLS_1_1
#define SSL_LIBRARY_VERSION_MIN_SUPPORTED_STREAM SSL_LIBRARY_VERSION_3_0

/* SSL_LIBRARY_VERSION_MAX_SUPPORTED is the maximum version that this version
 * of libssl supports. Applications should use SSL_VersionRangeGetSupported at
 * runtime to determine which versions are supported by the version of libssl
 * in use.
 */
#ifndef NSS_DISABLE_TLS_1_3
#define SSL_LIBRARY_VERSION_MAX_SUPPORTED SSL_LIBRARY_VERSION_TLS_1_3
#else
#define SSL_LIBRARY_VERSION_MAX_SUPPORTED SSL_LIBRARY_VERSION_TLS_1_2
#endif

#define SSL_ALL_VERSIONS_DISABLED(vrange) \
    ((vrange)->min == SSL_LIBRARY_VERSION_NONE)

extern PRBool ssl3_VersionIsSupported(SSLProtocolVariant protocolVariant,
                                      SSL3ProtocolVersion version);

/* These functions are called from secnav, even though they're "private". */

extern int SSL_RestartHandshakeAfterCertReq(struct sslSocketStr *ss,
                                            CERTCertificate *cert,
                                            SECKEYPrivateKey *key,
                                            CERTCertificateList *certChain);
extern sslSocket *ssl_FindSocket(PRFileDesc *fd);
extern void ssl_FreeSocket(struct sslSocketStr *ssl);
extern SECStatus SSL3_SendAlert(sslSocket *ss, SSL3AlertLevel level,
                                SSL3AlertDescription desc);
extern SECStatus ssl3_DecodeError(sslSocket *ss);

extern SECStatus ssl3_AuthCertificateComplete(sslSocket *ss, PRErrorCode error);

/*
 * for dealing with SSL 3.0 clients sending SSL 2.0 format hellos
 */
extern SECStatus ssl3_HandleV2ClientHello(
    sslSocket *ss, unsigned char *buffer, unsigned int length, PRUint8 padding);

SECStatus ssl3_SendClientHello(sslSocket *ss, sslClientHelloType type);

/*
 * input into the SSL3 machinery from the actualy network reading code
 */
SECStatus ssl3_HandleRecord(sslSocket *ss, SSL3Ciphertext *cipher);
SECStatus ssl3_HandleNonApplicationData(sslSocket *ss, SSLContentType rType,
                                        DTLSEpoch epoch,
                                        sslSequenceNumber seqNum,
                                        sslBuffer *databuf);
SECStatus ssl_RemoveTLSCBCPadding(sslBuffer *plaintext, unsigned int macSize);

int ssl3_GatherAppDataRecord(sslSocket *ss, int flags);
int ssl3_GatherCompleteHandshake(sslSocket *ss, int flags);

/* Create a new ref counted key pair object from two keys. */
extern sslKeyPair *ssl_NewKeyPair(SECKEYPrivateKey *privKey,
                                  SECKEYPublicKey *pubKey);

/* get a new reference (bump ref count) to an ssl3KeyPair. */
extern sslKeyPair *ssl_GetKeyPairRef(sslKeyPair *keyPair);

/* Decrement keypair's ref count and free if zero. */
extern void ssl_FreeKeyPair(sslKeyPair *keyPair);

extern sslEphemeralKeyPair *ssl_NewEphemeralKeyPair(
    const sslNamedGroupDef *group,
    SECKEYPrivateKey *privKey, SECKEYPublicKey *pubKey);
extern sslEphemeralKeyPair *ssl_CopyEphemeralKeyPair(
    sslEphemeralKeyPair *keyPair);
extern void ssl_FreeEphemeralKeyPair(sslEphemeralKeyPair *keyPair);
extern sslEphemeralKeyPair *ssl_LookupEphemeralKeyPair(
    sslSocket *ss, const sslNamedGroupDef *groupDef);
extern PRBool ssl_HaveEphemeralKeyPair(const sslSocket *ss,
                                       const sslNamedGroupDef *groupDef);
extern void ssl_FreeEphemeralKeyPairs(sslSocket *ss);

extern SECStatus ssl_AppendPaddedDHKeyShare(sslBuffer *buf,
                                            const SECKEYPublicKey *pubKey,
                                            PRBool appendLength);
extern const ssl3DHParams *ssl_GetDHEParams(const sslNamedGroupDef *groupDef);
extern SECStatus ssl_SelectDHEGroup(sslSocket *ss,
                                    const sslNamedGroupDef **groupDef);
extern SECStatus ssl_CreateDHEKeyPair(const sslNamedGroupDef *groupDef,
                                      const ssl3DHParams *params,
                                      sslEphemeralKeyPair **keyPair);
extern PRBool ssl_IsValidDHEShare(const SECItem *dh_p, const SECItem *dh_Ys);
extern SECStatus ssl_ValidateDHENamedGroup(sslSocket *ss,
                                           const SECItem *dh_p,
                                           const SECItem *dh_g,
                                           const sslNamedGroupDef **groupDef,
                                           const ssl3DHParams **dhParams);

extern PRBool ssl_IsECCEnabled(const sslSocket *ss);
extern PRBool ssl_IsDHEEnabled(const sslSocket *ss);

/* Macro for finding a curve equivalent in strength to RSA key's */
#define SSL_RSASTRENGTH_TO_ECSTRENGTH(s)                            \
    ((s <= 1024) ? 160                                              \
                 : ((s <= 2048) ? 224                               \
                                : ((s <= 3072) ? 256                \
                                               : ((s <= 7168) ? 384 \
                                                              : 521))))

extern const sslNamedGroupDef *ssl_LookupNamedGroup(SSLNamedGroup group);
extern PRBool ssl_NamedGroupEnabled(const sslSocket *ss, const sslNamedGroupDef *group);
extern SECStatus ssl_NamedGroup2ECParams(PLArenaPool *arena,
                                         const sslNamedGroupDef *curve,
                                         SECKEYECParams *params);
extern const sslNamedGroupDef *ssl_ECPubKey2NamedGroup(
    const SECKEYPublicKey *pubKey);

extern const sslNamedGroupDef *ssl_GetECGroupForServerSocket(sslSocket *ss);
extern void ssl_FilterSupportedGroups(sslSocket *ss);

extern SECStatus ssl3_CipherPrefSetDefault(ssl3CipherSuite which, PRBool on);
extern SECStatus ssl3_CipherPrefGetDefault(ssl3CipherSuite which, PRBool *on);

extern SECStatus ssl3_CipherPrefSet(sslSocket *ss, ssl3CipherSuite which, PRBool on);
extern SECStatus ssl3_CipherPrefGet(const sslSocket *ss, ssl3CipherSuite which, PRBool *on);

extern SECStatus ssl3_SetPolicy(ssl3CipherSuite which, PRInt32 policy);
extern SECStatus ssl3_GetPolicy(ssl3CipherSuite which, PRInt32 *policy);

extern void ssl3_InitSocketPolicy(sslSocket *ss);

extern SECStatus ssl3_RedoHandshake(sslSocket *ss, PRBool flushCache);
extern SECStatus ssl3_HandleHandshakeMessage(sslSocket *ss, PRUint8 *b,
                                             PRUint32 length,
                                             PRBool endOfRecord);

extern void ssl3_DestroySSL3Info(sslSocket *ss);

extern SECStatus ssl_ClientReadVersion(sslSocket *ss, PRUint8 **b,
                                       PRUint32 *length,
                                       SSL3ProtocolVersion *version);
extern SECStatus ssl3_NegotiateVersion(sslSocket *ss,
                                       SSL3ProtocolVersion peerVersion,
                                       PRBool allowLargerPeerVersion);
extern SECStatus ssl_ClientSetCipherSuite(sslSocket *ss,
                                          SSL3ProtocolVersion version,
                                          ssl3CipherSuite suite,
                                          PRBool initHashes);

extern SECStatus ssl_GetPeerInfo(sslSocket *ss);

/* ECDH functions */
extern SECStatus ssl3_SendECDHClientKeyExchange(sslSocket *ss,
                                                SECKEYPublicKey *svrPubKey);
extern SECStatus ssl3_HandleECDHServerKeyExchange(sslSocket *ss,
                                                  PRUint8 *b, PRUint32 length);
extern SECStatus ssl3_HandleECDHClientKeyExchange(sslSocket *ss,
                                                  PRUint8 *b, PRUint32 length,
                                                  sslKeyPair *serverKeys);
extern SECStatus ssl3_SendECDHServerKeyExchange(sslSocket *ss);
extern SECStatus ssl_ImportECDHKeyShare(
    SECKEYPublicKey *peerKey,
    PRUint8 *b, PRUint32 length, const sslNamedGroupDef *curve);

extern SECStatus ssl3_ComputeCommonKeyHash(SSLHashType hashAlg,
                                           PRUint8 *hashBuf,
                                           unsigned int bufLen,
                                           SSL3Hashes *hashes);
extern SECStatus ssl3_AppendSignatureAndHashAlgorithm(
    sslSocket *ss, const SSLSignatureAndHashAlg *sigAndHash);
extern SECStatus ssl3_ConsumeHandshake(sslSocket *ss, void *v, PRUint32 bytes,
                                       PRUint8 **b, PRUint32 *length);
extern SECStatus ssl3_ConsumeHandshakeNumber(sslSocket *ss, PRUint32 *num,
                                             PRUint32 bytes, PRUint8 **b,
                                             PRUint32 *length);
extern SECStatus ssl3_ConsumeHandshakeNumber64(sslSocket *ss, PRUint64 *num,
                                               PRUint32 bytes, PRUint8 **b,
                                               PRUint32 *length);
extern SECStatus ssl3_ConsumeHandshakeVariable(sslSocket *ss, SECItem *i,
                                               PRUint32 bytes, PRUint8 **b,
                                               PRUint32 *length);
extern PRBool ssl_IsSupportedSignatureScheme(SSLSignatureScheme scheme);
extern SECStatus ssl_CheckSignatureSchemeConsistency(
    sslSocket *ss, SSLSignatureScheme scheme, CERTCertificate *cert);
extern SECStatus ssl_ParseSignatureSchemes(const sslSocket *ss, PLArenaPool *arena,
                                           SSLSignatureScheme **schemesOut,
                                           unsigned int *numSchemesOut,
                                           unsigned char **b,
                                           unsigned int *len);
extern SECStatus ssl_ConsumeSignatureScheme(
    sslSocket *ss, PRUint8 **b, PRUint32 *length, SSLSignatureScheme *out);
extern SECStatus ssl3_SignHashes(sslSocket *ss, SSL3Hashes *hash,
                                 SECKEYPrivateKey *key, SECItem *buf);
extern SECStatus ssl3_VerifySignedHashes(sslSocket *ss, SSLSignatureScheme scheme,
                                         SSL3Hashes *hash, SECItem *buf);
extern SECStatus ssl3_CacheWrappedSecret(sslSocket *ss, sslSessionID *sid,
                                         PK11SymKey *secret);
extern void ssl3_FreeSniNameArray(TLSExtensionData *xtnData);

/* Hello Extension related routines. */
extern void ssl3_SetSIDSessionTicket(sslSessionID *sid,
                                     /*in/out*/ NewSessionTicket *session_ticket);
SECStatus ssl3_EncodeSessionTicket(sslSocket *ss,
                                   const NewSessionTicket *ticket,
                                   const PRUint8 *appToken,
                                   unsigned int appTokenLen,
                                   PK11SymKey *secret, SECItem *ticket_data);
SECStatus SSLExp_SendSessionTicket(PRFileDesc *fd, const PRUint8 *token,
                                   unsigned int tokenLen);

SECStatus ssl_MaybeSetSelfEncryptKeyPair(const sslKeyPair *keyPair);
SECStatus ssl_GetSelfEncryptKeys(sslSocket *ss, unsigned char *keyName,
                                 PK11SymKey **encKey, PK11SymKey **macKey);
void ssl_ResetSelfEncryptKeys();

extern SECStatus ssl3_ValidateAppProtocol(const unsigned char *data,
                                          unsigned int length);

/* Construct a new NSPR socket for the app to use */
extern PRFileDesc *ssl_NewPRSocket(sslSocket *ss, PRFileDesc *fd);
extern void ssl_FreePRSocket(PRFileDesc *fd);

/* Internal config function so SSL3 can initialize the present state of
 * various ciphers */
extern unsigned int ssl3_config_match_init(sslSocket *);

/* Return PR_TRUE if suite is usable.  This if the suite is permitted by policy,
 * enabled, has a certificate (as needed), has a viable key agreement method, is
 * usable with the negotiated TLS version, and is otherwise usable. */
PRBool ssl3_config_match(const ssl3CipherSuiteCfg *suite, PRUint8 policy,
                         const SSLVersionRange *vrange, const sslSocket *ss);

/* calls for accessing wrapping keys across processes. */
extern SECStatus
ssl_GetWrappingKey(unsigned int symWrapMechIndex, unsigned int wrapKeyIndex,
                   SSLWrappedSymWrappingKey *wswk);

/* The caller passes in the new value it wants
 * to set.  This code tests the wrapped sym key entry in the file on disk.
 * If it is uninitialized, this function writes the caller's value into
 * the disk entry, and returns false.
 * Otherwise, it overwrites the caller's wswk with the value obtained from
 * the disk, and returns PR_TRUE.
 * This is all done while holding the locks/semaphores necessary to make
 * the operation atomic.
 */
extern SECStatus
ssl_SetWrappingKey(SSLWrappedSymWrappingKey *wswk);

/* get rid of the symmetric wrapping key references. */
extern SECStatus SSL3_ShutdownServerCache(void);

extern SECStatus ssl_InitSymWrapKeysLock(void);

extern SECStatus ssl_FreeSymWrapKeysLock(void);

extern SECStatus ssl_InitSessionCacheLocks(PRBool lazyInit);

extern SECStatus ssl_FreeSessionCacheLocks(void);

CK_MECHANISM_TYPE ssl3_Alg2Mech(SSLCipherAlgorithm calg);
SECStatus ssl3_NegotiateCipherSuiteInner(sslSocket *ss, const SECItem *suites,
                                         PRUint16 version, PRUint16 *suitep);
SECStatus ssl3_NegotiateCipherSuite(sslSocket *ss, const SECItem *suites,
                                    PRBool initHashes);
SECStatus ssl3_InitHandshakeHashes(sslSocket *ss);
SECStatus ssl3_ServerCallSNICallback(sslSocket *ss);
SECStatus ssl3_FlushHandshake(sslSocket *ss, PRInt32 flags);
SECStatus ssl3_CompleteHandleCertificate(sslSocket *ss,
                                         PRUint8 *b, PRUint32 length);
void ssl3_SendAlertForCertError(sslSocket *ss, PRErrorCode errCode);
SECStatus ssl3_HandleNoCertificate(sslSocket *ss);
SECStatus ssl3_SendEmptyCertificate(sslSocket *ss);
void ssl3_CleanupPeerCerts(sslSocket *ss);
SECStatus ssl3_SendCertificateStatus(sslSocket *ss);
SECStatus ssl3_AuthCertificate(sslSocket *ss);
SECStatus ssl_ReadCertificateStatus(sslSocket *ss, PRUint8 *b,
                                    PRUint32 length);
SECStatus ssl3_EncodeSigAlgs(const sslSocket *ss, sslBuffer *buf);
SECStatus ssl_GetCertificateRequestCAs(const sslSocket *ss,
                                       unsigned int *calenp,
                                       const SECItem **namesp,
                                       unsigned int *nnamesp);
SECStatus ssl3_ParseCertificateRequestCAs(sslSocket *ss, PRUint8 **b,
                                          PRUint32 *length, CERTDistNames *ca_list);
SECStatus ssl3_CompleteHandleCertificateRequest(
    sslSocket *ss, const SSLSignatureScheme *signatureSchemes,
    unsigned int signatureSchemeCount, CERTDistNames *ca_list);
SECStatus ssl_ConstructServerHello(sslSocket *ss, PRBool helloRetry,
                                   const sslBuffer *extensionBuf,
                                   sslBuffer *messageBuf);
SECStatus ssl3_SendServerHello(sslSocket *ss);
SECStatus ssl3_SendChangeCipherSpecsInt(sslSocket *ss);
SECStatus ssl3_ComputeHandshakeHashes(sslSocket *ss,
                                      ssl3CipherSpec *spec,
                                      SSL3Hashes *hashes,
                                      PRUint32 sender);
SECStatus ssl_CreateECDHEphemeralKeyPair(const sslSocket *ss,
                                         const sslNamedGroupDef *ecGroup,
                                         sslEphemeralKeyPair **keyPair);
SECStatus ssl_CreateStaticECDHEKey(sslSocket *ss,
                                   const sslNamedGroupDef *ecGroup);
SECStatus ssl3_FlushHandshake(sslSocket *ss, PRInt32 flags);
PK11SymKey *ssl3_GetWrappingKey(sslSocket *ss,
                                PK11SlotInfo *masterSecretSlot,
                                CK_MECHANISM_TYPE masterWrapMech,
                                void *pwArg);
SECStatus ssl3_FillInCachedSID(sslSocket *ss, sslSessionID *sid,
                               PK11SymKey *secret);
const ssl3CipherSuiteDef *ssl_LookupCipherSuiteDef(ssl3CipherSuite suite);
const ssl3CipherSuiteCfg *ssl_LookupCipherSuiteCfg(ssl3CipherSuite suite,
                                                   const ssl3CipherSuiteCfg *suites);

SECStatus ssl3_SelectServerCert(sslSocket *ss);
SECStatus ssl_PickSignatureScheme(sslSocket *ss,
                                  CERTCertificate *cert,
                                  SECKEYPublicKey *pubKey,
                                  SECKEYPrivateKey *privKey,
                                  const SSLSignatureScheme *peerSchemes,
                                  unsigned int peerSchemeCount,
                                  PRBool requireSha1);
SECOidTag ssl3_HashTypeToOID(SSLHashType hashType);
SSLHashType ssl_SignatureSchemeToHashType(SSLSignatureScheme scheme);
SSLAuthType ssl_SignatureSchemeToAuthType(SSLSignatureScheme scheme);

SECStatus ssl3_SetupCipherSuite(sslSocket *ss, PRBool initHashes);
SECStatus ssl_InsertRecordHeader(const sslSocket *ss, ssl3CipherSpec *cwSpec,
                                 SSLContentType contentType, sslBuffer *wrBuf,
                                 PRBool *needsLength);

/* Pull in DTLS functions */
#include "dtlscon.h"

/* Pull in TLS 1.3 functions */
#include "tls13con.h"
#include "dtls13con.h"

/********************** misc calls *********************/

#ifdef DEBUG
extern void ssl3_CheckCipherSuiteOrderConsistency();
#endif

extern int ssl_MapLowLevelError(int hiLevelError);

extern PRUint32 ssl_TimeSec(void);
#ifdef UNSAFE_FUZZER_MODE
#define ssl_TimeUsec() ((PRTime)12345678)
#else
#define ssl_TimeUsec() (PR_Now())
#endif
extern PRBool ssl_TicketTimeValid(const NewSessionTicket *ticket);

extern void SSL_AtomicIncrementLong(long *x);

SECStatus ssl3_ApplyNSSPolicy(void);

extern SECStatus
ssl3_TLSPRFWithMasterSecret(sslSocket *ss, ssl3CipherSpec *spec,
                            const char *label, unsigned int labelLen,
                            const unsigned char *val, unsigned int valLen,
                            unsigned char *out, unsigned int outLen);

extern void
ssl3_RecordKeyLog(sslSocket *ss, const char *label, PK11SymKey *secret);

PRBool ssl_AlpnTagAllowed(const sslSocket *ss, const SECItem *tag);

#ifdef TRACE
#define SSL_TRACE(msg) ssl_Trace msg
#else
#define SSL_TRACE(msg)
#endif

void ssl_Trace(const char *format, ...);

void ssl_CacheExternalToken(sslSocket *ss);
SECStatus ssl_DecodeResumptionToken(sslSessionID *sid, const PRUint8 *encodedTicket,
                                    PRUint32 encodedTicketLen);
PRBool ssl_IsResumptionTokenUsable(sslSocket *ss, sslSessionID *sid);

/* Remove when stable. */

SECStatus SSLExp_SetResumptionTokenCallback(PRFileDesc *fd,
                                            SSLResumptionTokenCallback cb,
                                            void *ctx);
SECStatus SSLExp_SetResumptionToken(PRFileDesc *fd, const PRUint8 *token,
                                    unsigned int len);

SECStatus SSLExp_GetResumptionTokenInfo(const PRUint8 *tokenData, unsigned int tokenLen,
                                        SSLResumptionTokenInfo *token, unsigned int version);

SECStatus SSLExp_DestroyResumptionTokenInfo(SSLResumptionTokenInfo *token);

#define SSLResumptionTokenVersion 2

SEC_END_PROTOS

#if defined(XP_UNIX) || defined(XP_OS2) || defined(XP_BEOS)
#define SSL_GETPID getpid
#elif defined(WIN32)
extern int __cdecl _getpid(void);
#define SSL_GETPID _getpid
#else
#define SSL_GETPID() 0
#endif

#endif /* __sslimpl_h_ */