mirror of https://github.com/openssl/openssl
536 lines
20 KiB
C
536 lines
20 KiB
C
/*
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* Copyright 2022-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/bio.h>
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#include <openssl/ssl.h>
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#include <openssl/err.h>
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#include "../../ssl_local.h"
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#include "../record_local.h"
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typedef struct dtls_bitmap_st {
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/* Track 64 packets */
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uint64_t map;
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/* Max record number seen so far, 64-bit value in big-endian encoding */
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unsigned char max_seq_num[SEQ_NUM_SIZE];
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} DTLS_BITMAP;
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typedef struct ssl_mac_buf_st {
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unsigned char *mac;
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int alloced;
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} SSL_MAC_BUF;
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typedef struct tls_buffer_st {
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/* at least SSL3_RT_MAX_PACKET_SIZE bytes */
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unsigned char *buf;
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/* default buffer size (or 0 if no default set) */
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size_t default_len;
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/* buffer size */
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size_t len;
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/* where to 'copy from' */
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size_t offset;
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/* how many bytes left */
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size_t left;
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/* 'buf' is from application for KTLS */
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int app_buffer;
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/* The type of data stored in this buffer. Only used for writing */
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int type;
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} TLS_BUFFER;
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typedef struct tls_rl_record_st {
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/* Record layer version */
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/* r */
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int rec_version;
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/* type of record */
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/* r */
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int type;
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/* How many bytes available */
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/* rw */
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size_t length;
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/*
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* How many bytes were available before padding was removed? This is used
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* to implement the MAC check in constant time for CBC records.
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*/
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/* rw */
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size_t orig_len;
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/* read/write offset into 'buf' */
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/* r */
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size_t off;
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/* pointer to the record data */
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/* rw */
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unsigned char *data;
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/* where the decode bytes are */
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/* rw */
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unsigned char *input;
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/* only used with decompression - malloc()ed */
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/* r */
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unsigned char *comp;
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/* epoch number, needed by DTLS1 */
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/* r */
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uint16_t epoch;
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/* sequence number, needed by DTLS1 */
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/* r */
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unsigned char seq_num[SEQ_NUM_SIZE];
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} TLS_RL_RECORD;
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/* Macros/functions provided by the TLS_RL_RECORD component */
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#define TLS_RL_RECORD_set_type(r, t) ((r)->type = (t))
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#define TLS_RL_RECORD_set_rec_version(r, v) ((r)->rec_version = (v))
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#define TLS_RL_RECORD_get_length(r) ((r)->length)
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#define TLS_RL_RECORD_set_length(r, l) ((r)->length = (l))
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#define TLS_RL_RECORD_add_length(r, l) ((r)->length += (l))
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#define TLS_RL_RECORD_set_data(r, d) ((r)->data = (d))
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#define TLS_RL_RECORD_set_input(r, i) ((r)->input = (i))
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#define TLS_RL_RECORD_reset_input(r) ((r)->input = (r)->data)
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/* Protocol version specific function pointers */
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struct record_functions_st
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{
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/*
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* Returns either OSSL_RECORD_RETURN_SUCCESS, OSSL_RECORD_RETURN_FATAL or
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* OSSL_RECORD_RETURN_NON_FATAL_ERR if we can keep trying to find an
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* alternative record layer.
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*/
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int (*set_crypto_state)(OSSL_RECORD_LAYER *rl, int level,
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unsigned char *key, size_t keylen,
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unsigned char *iv, size_t ivlen,
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unsigned char *mackey, size_t mackeylen,
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const EVP_CIPHER *ciph,
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size_t taglen,
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int mactype,
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const EVP_MD *md,
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COMP_METHOD *comp);
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/*
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* Returns:
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* 0: if the record is publicly invalid, or an internal error, or AEAD
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* decryption failed, or EtM decryption failed.
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* 1: Success or MtE decryption failed (MAC will be randomised)
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*/
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int (*cipher)(OSSL_RECORD_LAYER *rl, TLS_RL_RECORD *recs, size_t n_recs,
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int sending, SSL_MAC_BUF *macs, size_t macsize);
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/* Returns 1 for success or 0 for error */
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int (*mac)(OSSL_RECORD_LAYER *rl, TLS_RL_RECORD *rec, unsigned char *md,
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int sending);
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/* Return 1 for success or 0 for error */
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int (*set_protocol_version)(OSSL_RECORD_LAYER *rl, int version);
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/* Read related functions */
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int (*read_n)(OSSL_RECORD_LAYER *rl, size_t n, size_t max, int extend,
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int clearold, size_t *readbytes);
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int (*get_more_records)(OSSL_RECORD_LAYER *rl);
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/* Return 1 for success or 0 for error */
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int (*validate_record_header)(OSSL_RECORD_LAYER *rl, TLS_RL_RECORD *rec);
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/* Return 1 for success or 0 for error */
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int (*post_process_record)(OSSL_RECORD_LAYER *rl, TLS_RL_RECORD *rec);
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/* Write related functions */
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size_t (*get_max_records)(OSSL_RECORD_LAYER *rl, uint8_t type, size_t len,
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size_t maxfrag, size_t *preffrag);
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/* Return 1 for success or 0 for error */
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int (*write_records)(OSSL_RECORD_LAYER *rl, OSSL_RECORD_TEMPLATE *templates,
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size_t numtempl);
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/* Allocate the rl->wbuf buffers. Return 1 for success or 0 for error */
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int (*allocate_write_buffers)(OSSL_RECORD_LAYER *rl,
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OSSL_RECORD_TEMPLATE *templates,
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size_t numtempl, size_t *prefix);
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/*
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* Initialise the packets in the |pkt| array using the buffers in |rl->wbuf|.
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* Some protocol versions may use the space in |prefixtempl| to add
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* an artificial template in front of the |templates| array and hence may
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* initialise 1 more WPACKET than there are templates. |*wpinited|
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* returns the number of WPACKETs in |pkt| that were successfully
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* initialised. This must be 0 on entry and will be filled in even on error.
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*/
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int (*initialise_write_packets)(OSSL_RECORD_LAYER *rl,
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OSSL_RECORD_TEMPLATE *templates,
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size_t numtempl,
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OSSL_RECORD_TEMPLATE *prefixtempl,
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WPACKET *pkt,
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TLS_BUFFER *bufs,
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size_t *wpinited);
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/* Get the actual record type to be used for a given template */
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uint8_t (*get_record_type)(OSSL_RECORD_LAYER *rl,
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OSSL_RECORD_TEMPLATE *template);
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/* Write the record header data to the WPACKET */
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int (*prepare_record_header)(OSSL_RECORD_LAYER *rl, WPACKET *thispkt,
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OSSL_RECORD_TEMPLATE *templ,
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uint8_t rectype,
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unsigned char **recdata);
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int (*add_record_padding)(OSSL_RECORD_LAYER *rl,
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OSSL_RECORD_TEMPLATE *thistempl,
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WPACKET *thispkt,
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TLS_RL_RECORD *thiswr);
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/*
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* This applies any mac that might be necessary, ensures that we have enough
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* space in the WPACKET to perform the encryption and sets up the
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* TLS_RL_RECORD ready for that encryption.
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*/
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int (*prepare_for_encryption)(OSSL_RECORD_LAYER *rl,
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size_t mac_size,
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WPACKET *thispkt,
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TLS_RL_RECORD *thiswr);
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/*
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* Any updates required to the record after encryption has been applied. For
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* example, adding a MAC if using encrypt-then-mac
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*/
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int (*post_encryption_processing)(OSSL_RECORD_LAYER *rl,
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size_t mac_size,
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OSSL_RECORD_TEMPLATE *thistempl,
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WPACKET *thispkt,
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TLS_RL_RECORD *thiswr);
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/*
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* Some record layer implementations need to do some custom preparation of
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* the BIO before we write to it. KTLS does this to prevent coalescing of
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* control and data messages.
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*/
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int (*prepare_write_bio)(OSSL_RECORD_LAYER *rl, int type);
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};
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struct ossl_record_layer_st
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{
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OSSL_LIB_CTX *libctx;
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const char *propq;
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int isdtls;
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int version;
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int role;
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int direction;
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int level;
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const EVP_MD *md;
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/* DTLS only */
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uint16_t epoch;
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/*
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* A BIO containing any data read in the previous epoch that was destined
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* for this epoch
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*/
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BIO *prev;
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/* The transport BIO */
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BIO *bio;
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/*
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* A BIO where we will send any data read by us that is destined for the
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* next epoch.
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*/
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BIO *next;
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/* Types match the equivalent fields in the SSL object */
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uint64_t options;
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uint32_t mode;
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/* write IO goes into here */
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TLS_BUFFER wbuf[SSL_MAX_PIPELINES + 1];
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/* Next wbuf with pending data still to write */
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size_t nextwbuf;
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/* How many pipelines can be used to write data */
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size_t numwpipes;
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/* read IO goes into here */
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TLS_BUFFER rbuf;
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/* each decoded record goes in here */
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TLS_RL_RECORD rrec[SSL_MAX_PIPELINES];
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/* How many records have we got available in the rrec buffer */
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size_t num_recs;
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/* The record number in the rrec buffer that can be read next */
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size_t curr_rec;
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/* The number of records that have been released via tls_release_record */
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size_t num_released;
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/* where we are when reading */
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int rstate;
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/* used internally to point at a raw packet */
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unsigned char *packet;
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size_t packet_length;
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/* Sequence number for the next record */
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unsigned char sequence[SEQ_NUM_SIZE];
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/* Alert code to be used if an error occurs */
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int alert;
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/*
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* Read as many input bytes as possible (for non-blocking reads)
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*/
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int read_ahead;
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/* The number of consecutive empty records we have received */
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size_t empty_record_count;
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/*
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* Do we need to send a prefix empty record before application data as a
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* countermeasure against known-IV weakness (necessary for SSLv3 and
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* TLSv1.0)
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*/
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int need_empty_fragments;
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/* cryptographic state */
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EVP_CIPHER_CTX *enc_ctx;
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/* Explicit IV length */
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size_t eivlen;
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/* used for mac generation */
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EVP_MD_CTX *md_ctx;
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/* compress/uncompress */
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COMP_CTX *compctx;
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/* Set to 1 if this is the first handshake. 0 otherwise */
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int is_first_handshake;
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/*
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* The smaller of the configured and negotiated maximum fragment length
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* or SSL3_RT_MAX_PLAIN_LENGTH if none
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*/
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unsigned int max_frag_len;
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/* The maximum amount of early data we can receive/send */
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uint32_t max_early_data;
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/* The amount of early data that we have sent/received */
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size_t early_data_count;
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/* TLSv1.3 record padding */
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size_t block_padding;
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/* Only used by SSLv3 */
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unsigned char mac_secret[EVP_MAX_MD_SIZE];
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/* TLSv1.0/TLSv1.1/TLSv1.2 */
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int use_etm;
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/* Flags for GOST ciphers */
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int stream_mac;
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int tlstree;
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/* TLSv1.3 fields */
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/* static IV */
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unsigned char iv[EVP_MAX_IV_LENGTH];
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int allow_plain_alerts;
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/* TLS "any" fields */
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/* Set to true if this is the first record in a connection */
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unsigned int is_first_record;
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size_t taglen;
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/* DTLS received handshake records (processed and unprocessed) */
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struct pqueue_st *unprocessed_rcds;
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struct pqueue_st *processed_rcds;
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/* records being received in the current epoch */
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DTLS_BITMAP bitmap;
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/* renegotiation starts a new set of sequence numbers */
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DTLS_BITMAP next_bitmap;
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/*
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* Whether we are currently in a handshake or not. Only maintained for DTLS
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*/
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int in_init;
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/* Callbacks */
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void *cbarg;
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OSSL_FUNC_rlayer_skip_early_data_fn *skip_early_data;
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OSSL_FUNC_rlayer_msg_callback_fn *msg_callback;
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OSSL_FUNC_rlayer_security_fn *security;
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OSSL_FUNC_rlayer_padding_fn *padding;
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size_t max_pipelines;
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/* Function pointers for version specific functions */
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const struct record_functions_st *funcs;
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};
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typedef struct dtls_rlayer_record_data_st {
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unsigned char *packet;
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size_t packet_length;
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TLS_BUFFER rbuf;
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TLS_RL_RECORD rrec;
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} DTLS_RLAYER_RECORD_DATA;
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extern const struct record_functions_st ssl_3_0_funcs;
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extern const struct record_functions_st tls_1_funcs;
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extern const struct record_functions_st tls_1_3_funcs;
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extern const struct record_functions_st tls_any_funcs;
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extern const struct record_functions_st dtls_1_funcs;
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extern const struct record_functions_st dtls_any_funcs;
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void ossl_rlayer_fatal(OSSL_RECORD_LAYER *rl, int al, int reason,
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const char *fmt, ...);
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#define RLAYERfatal(rl, al, r) RLAYERfatal_data((rl), (al), (r), NULL)
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#define RLAYERfatal_data \
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(ERR_new(), \
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ERR_set_debug(OPENSSL_FILE, OPENSSL_LINE, OPENSSL_FUNC), \
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ossl_rlayer_fatal)
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#define RLAYER_USE_EXPLICIT_IV(rl) ((rl)->version == TLS1_1_VERSION \
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|| (rl)->version == TLS1_2_VERSION \
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|| (rl)->isdtls)
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void ossl_tls_rl_record_set_seq_num(TLS_RL_RECORD *r,
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const unsigned char *seq_num);
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int ossl_set_tls_provider_parameters(OSSL_RECORD_LAYER *rl,
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EVP_CIPHER_CTX *ctx,
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const EVP_CIPHER *ciph,
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const EVP_MD *md);
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int tls_increment_sequence_ctr(OSSL_RECORD_LAYER *rl);
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int tls_alloc_buffers(OSSL_RECORD_LAYER *rl);
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int tls_free_buffers(OSSL_RECORD_LAYER *rl);
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int tls_default_read_n(OSSL_RECORD_LAYER *rl, size_t n, size_t max, int extend,
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int clearold, size_t *readbytes);
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int tls_get_more_records(OSSL_RECORD_LAYER *rl);
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int dtls_get_more_records(OSSL_RECORD_LAYER *rl);
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int dtls_prepare_record_header(OSSL_RECORD_LAYER *rl,
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WPACKET *thispkt,
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OSSL_RECORD_TEMPLATE *templ,
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uint8_t rectype,
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unsigned char **recdata);
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int dtls_post_encryption_processing(OSSL_RECORD_LAYER *rl,
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size_t mac_size,
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OSSL_RECORD_TEMPLATE *thistempl,
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WPACKET *thispkt,
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TLS_RL_RECORD *thiswr);
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int tls_default_set_protocol_version(OSSL_RECORD_LAYER *rl, int version);
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int tls_default_validate_record_header(OSSL_RECORD_LAYER *rl, TLS_RL_RECORD *re);
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int tls_do_compress(OSSL_RECORD_LAYER *rl, TLS_RL_RECORD *wr);
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int tls_do_uncompress(OSSL_RECORD_LAYER *rl, TLS_RL_RECORD *rec);
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int tls_default_post_process_record(OSSL_RECORD_LAYER *rl, TLS_RL_RECORD *rec);
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int tls13_common_post_process_record(OSSL_RECORD_LAYER *rl, TLS_RL_RECORD *rec);
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int
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tls_int_new_record_layer(OSSL_LIB_CTX *libctx, const char *propq, int vers,
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int role, int direction, int level,
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const EVP_CIPHER *ciph, size_t taglen,
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const EVP_MD *md, COMP_METHOD *comp, BIO *prev,
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BIO *transport, BIO *next,
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const OSSL_PARAM *settings, const OSSL_PARAM *options,
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const OSSL_DISPATCH *fns, void *cbarg,
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OSSL_RECORD_LAYER **retrl);
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int tls_free(OSSL_RECORD_LAYER *rl);
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int tls_unprocessed_read_pending(OSSL_RECORD_LAYER *rl);
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int tls_processed_read_pending(OSSL_RECORD_LAYER *rl);
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size_t tls_app_data_pending(OSSL_RECORD_LAYER *rl);
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size_t tls_get_max_records(OSSL_RECORD_LAYER *rl, uint8_t type, size_t len,
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size_t maxfrag, size_t *preffrag);
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int tls_write_records(OSSL_RECORD_LAYER *rl, OSSL_RECORD_TEMPLATE *templates,
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size_t numtempl);
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int tls_retry_write_records(OSSL_RECORD_LAYER *rl);
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int tls_get_alert_code(OSSL_RECORD_LAYER *rl);
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int tls_set1_bio(OSSL_RECORD_LAYER *rl, BIO *bio);
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int tls_read_record(OSSL_RECORD_LAYER *rl, void **rechandle, int *rversion,
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uint8_t *type, const unsigned char **data, size_t *datalen,
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uint16_t *epoch, unsigned char *seq_num);
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int tls_release_record(OSSL_RECORD_LAYER *rl, void *rechandle, size_t length);
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int tls_default_set_protocol_version(OSSL_RECORD_LAYER *rl, int version);
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int tls_set_protocol_version(OSSL_RECORD_LAYER *rl, int version);
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void tls_set_plain_alerts(OSSL_RECORD_LAYER *rl, int allow);
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void tls_set_first_handshake(OSSL_RECORD_LAYER *rl, int first);
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void tls_set_max_pipelines(OSSL_RECORD_LAYER *rl, size_t max_pipelines);
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void tls_get_state(OSSL_RECORD_LAYER *rl, const char **shortstr,
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const char **longstr);
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int tls_set_options(OSSL_RECORD_LAYER *rl, const OSSL_PARAM *options);
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const COMP_METHOD *tls_get_compression(OSSL_RECORD_LAYER *rl);
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void tls_set_max_frag_len(OSSL_RECORD_LAYER *rl, size_t max_frag_len);
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int tls_setup_read_buffer(OSSL_RECORD_LAYER *rl);
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int tls_setup_write_buffer(OSSL_RECORD_LAYER *rl, size_t numwpipes,
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size_t firstlen, size_t nextlen);
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int tls_write_records_multiblock(OSSL_RECORD_LAYER *rl,
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OSSL_RECORD_TEMPLATE *templates,
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size_t numtempl);
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size_t tls_get_max_records_default(OSSL_RECORD_LAYER *rl, uint8_t type,
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size_t len,
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size_t maxfrag, size_t *preffrag);
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size_t tls_get_max_records_multiblock(OSSL_RECORD_LAYER *rl, uint8_t type,
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size_t len, size_t maxfrag,
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size_t *preffrag);
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int tls_allocate_write_buffers_default(OSSL_RECORD_LAYER *rl,
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OSSL_RECORD_TEMPLATE *templates,
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size_t numtempl, size_t *prefix);
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int tls_initialise_write_packets_default(OSSL_RECORD_LAYER *rl,
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OSSL_RECORD_TEMPLATE *templates,
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size_t numtempl,
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OSSL_RECORD_TEMPLATE *prefixtempl,
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WPACKET *pkt,
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TLS_BUFFER *bufs,
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size_t *wpinited);
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int tls1_allocate_write_buffers(OSSL_RECORD_LAYER *rl,
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OSSL_RECORD_TEMPLATE *templates,
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size_t numtempl, size_t *prefix);
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int tls1_initialise_write_packets(OSSL_RECORD_LAYER *rl,
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OSSL_RECORD_TEMPLATE *templates,
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size_t numtempl,
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OSSL_RECORD_TEMPLATE *prefixtempl,
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WPACKET *pkt,
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TLS_BUFFER *bufs,
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size_t *wpinited);
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int tls_prepare_record_header_default(OSSL_RECORD_LAYER *rl,
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WPACKET *thispkt,
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OSSL_RECORD_TEMPLATE *templ,
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uint8_t rectype,
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unsigned char **recdata);
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int tls_prepare_for_encryption_default(OSSL_RECORD_LAYER *rl,
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size_t mac_size,
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WPACKET *thispkt,
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TLS_RL_RECORD *thiswr);
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int tls_post_encryption_processing_default(OSSL_RECORD_LAYER *rl,
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size_t mac_size,
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OSSL_RECORD_TEMPLATE *thistempl,
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WPACKET *thispkt,
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TLS_RL_RECORD *thiswr);
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int tls_write_records_default(OSSL_RECORD_LAYER *rl,
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OSSL_RECORD_TEMPLATE *templates,
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size_t numtempl);
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/* Macros/functions provided by the TLS_BUFFER component */
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#define TLS_BUFFER_get_buf(b) ((b)->buf)
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#define TLS_BUFFER_set_buf(b, n) ((b)->buf = (n))
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#define TLS_BUFFER_get_len(b) ((b)->len)
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#define TLS_BUFFER_get_left(b) ((b)->left)
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#define TLS_BUFFER_set_left(b, l) ((b)->left = (l))
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#define TLS_BUFFER_sub_left(b, l) ((b)->left -= (l))
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#define TLS_BUFFER_get_offset(b) ((b)->offset)
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#define TLS_BUFFER_set_offset(b, o) ((b)->offset = (o))
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#define TLS_BUFFER_add_offset(b, o) ((b)->offset += (o))
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#define TLS_BUFFER_set_app_buffer(b, l) ((b)->app_buffer = (l))
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#define TLS_BUFFER_is_app_buffer(b) ((b)->app_buffer)
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void ossl_tls_buffer_release(TLS_BUFFER *b);
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