314 lines
8.3 KiB
C
314 lines
8.3 KiB
C
#ifndef SMPC_H_
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#define SMPC_H_
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/**
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****************************************************************************************
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* @addtogroup SMP Security Manager Protocol
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* @ingroup HOST
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* @brief Security Manager Protocol.
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*
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* The SMP is responsible for the over-all security policies of BLE.
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* It defines methods for pairing and key distribution, handles encryption,
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* data signing and privacy features such as random addressing generation and resolution.
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*
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* Pairing is performed to exchange pairing features and generate a short term
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* key for link encryption.
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* A transport specific key distribution is performed to
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* share the keys that can be used to encrypt the link in the future
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* reconnection process, signed data verification and random address
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* resolution.
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*
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* There exist 3 phases in the complete security procedure:
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* 1. Feature exchange (IO capabilities, OOB flags, Authentication Requirements, Key distributions)
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* 2. Short Term Key generation
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* Generation method depends on exchanged features:
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* - Just Works - use Temporary key = 0
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* - PassKey Entry - use Temporary Key = 6-digit provided by user
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* - Out of Band (OOB) - use Temporary Key = 16-octet key, available form OOB source
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* 3. Transport Specific Key Distribution (TKDP)(LTK+EDIV+RAND_NB, IRK+ADDR, CSRK)
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*---------------------------------------------------------------------
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* @addtogroup SMPC Security Manager Protocol Controller
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* @ingroup SMP
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* @brief Security Manager Protocol Controller.
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*
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* This block handles control of SM procedures for several possible existing connections,
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* for which the security procedure may be conducted simultaneously.
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*
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* It allows flow control for HCI access to encryption and random number generation, used
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* at different moments in the procedure.
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*
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* It handles PDU creation and sending through L2CAP, also their reception from L2CAP
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* and interpretation.
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*
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* Other small utilities such as maximum key size determination and TKDP organization are
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* implemented in SMPC.
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* @{
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*
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****************************************************************************************
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*/
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/*
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* INCLUDE FILES
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****************************************************************************************
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*/
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#include "rwip_config.h"
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#if (BLE_SMPC)
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#include "co_bt.h"
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#include "gap.h"
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#include "gapc_task.h"
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#include "ke_task.h"
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/*
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* DEFINES
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****************************************************************************************
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*/
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/// MAC length
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#define SMPC_SIGN_MAC_LEN (8)
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/// SignCounter length
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#define SMPC_SIGN_COUNTER_LEN (4)
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/// Signature length
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#define SMPC_SIGN_LEN (SMPC_SIGN_MAC_LEN + SMPC_SIGN_COUNTER_LEN)
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/**
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* Repeated Attempts Timer Configuration
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*/
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/// Repeated Attempts Timer default value (x10ms)
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#define SMPC_REP_ATTEMPTS_TIMER_DEF_VAL (200) //2s
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/// Repeated Attempts Timer max value (x10ms)
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#define SMPC_REP_ATTEMPTS_TIMER_MAX_VAL (3000) //30s
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/// Repeated Attempts Timer multiplier
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#define SMPC_REP_ATTEMPTS_TIMER_MULT (2)
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/**
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* Timeout Timer Configuration
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*/
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#define SMPC_TIMEOUT_TIMER_DURATION (3000) //30s
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#define SMPC_PUBLIC_KEY_256_COORD_LEN 0x20
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/*
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* ENUMERATIONS
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****************************************************************************************
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*/
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/// Information source.
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enum smpc_addr_src
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{
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/// Local info.
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SMPC_INFO_LOCAL,
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/// Peer info.
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SMPC_INFO_PEER,
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/// Maximum info source.
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SMPC_INFO_MAX
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};
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/*
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* STRUCTURES DEFINITION
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****************************************************************************************
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*/
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/// Master ID Information Structure
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struct smpc_mst_id_info
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{
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// Encryption Diversifier
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uint16_t ediv;
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// Random Number
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uint8_t randnb[GAP_RAND_NB_LEN];
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};
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#if (SECURE_CONNECTIONS)
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struct smp_aes_cmac
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{
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uint8_t* M; // pointer to memory allocated by calling function
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uint8_t M_len;
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uint8_t M_last[16];
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uint8_t X[16];
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uint8_t Y[16];
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uint8_t* K; //[16];
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uint8_t K1[16];
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uint8_t K2[16];
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uint8_t next_block;
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uint8_t num_blocks;
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uint8_t state; // Only 3 States - Idle, SubKey Generation, Block AES
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};
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struct smp_f4
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{
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uint8_t M[65];
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uint8_t X[16]; // The Key
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};
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struct smp_f5
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{
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uint8_t M[53];
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uint8_t* W;
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uint8_t T[16];
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uint8_t SALT[16];
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};
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struct smp_f6
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{
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uint8_t W[16];
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uint8_t M[65];
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};
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struct smp_g2
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{
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uint8_t X[16];
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uint8_t M[80];
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};
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struct gapc_public_key
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{
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uint8_t x[GAP_P256_KEY_LEN];
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uint8_t y[GAP_P256_KEY_LEN];
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};
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#endif // (SECURE_CONNECTIONS)
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/// Pairing Information
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struct smpc_pair_info
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{
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/// TK during Phase 2, LTK or IRK during Phase 3
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struct gap_sec_key key;
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/// Pairing request command
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struct gapc_pairing pair_req_feat;
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/// Pairing response feature
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struct gapc_pairing pair_rsp_feat;
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/// Random number value
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uint8_t rand[RAND_VAL_LEN];
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/// Remote random number value
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uint8_t rem_rand[RAND_VAL_LEN];
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/// Confirm value to check
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uint8_t conf_value[GAP_KEY_LEN];
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/// Pairing Method
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uint8_t pair_method;
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/// Authentication level
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uint8_t auth;
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/// check that LTK exchanged during pairing
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bool ltk_exchanged;
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/// Key to be exchanged (transmitted or to be received)
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uint8_t keys_dist;
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#if (SECURE_CONNECTIONS)
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// AES_CMAC Info
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struct smp_aes_cmac* aes_cmac;
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// Structure for Secure Connections Crypto functions
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struct smp_f4* f4_info;
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struct smp_f5* f5_info;
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struct smp_f6* f6_info;
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struct smp_g2* g2_info;
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bool dh_key_calculation_complete;
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uint8_t MacKey[GAP_KEY_LEN];
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uint8_t dh_key_check_peer[DHKEY_CHECK_LEN];
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uint8_t dh_key_local[DH_KEY_LEN];
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uint8_t dh_key_check_local[DHKEY_CHECK_LEN];
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bool dh_key_check_received_from_peer;
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public_key_t peer_public_key;
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uint8_t passkey_bit_count;
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uint32_t passkey;
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// Required for OOB
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uint8_t peer_r[GAP_KEY_LEN];
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uint8_t local_r[GAP_KEY_LEN];
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bool peer_rand_received;
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bool peer_confirm_received;
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#endif // (SECURE_CONNECTIONS)
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};
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/// Signing Information
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struct smpc_sign_info
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{
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/// Operation requester task id
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ke_task_id_t requester;
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/// Message offset
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uint16_t msg_offset;
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/// Number of block
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uint8_t block_nb;
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/// Cn-1 value -> Need to kept this value to retrieve it after L generation
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uint8_t cn1[GAP_KEY_LEN];
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};
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/// SMPC environment structure
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struct smpc_env
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{
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/// SMPC temporary information
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union smpc_info
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{
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/**
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* Pairing Information - This structure is allocated at the beginning of a pairing
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* or procedure. It is freed when a disconnection occurs or at the end of
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* the pairing procedure. If not enough memory can be found, the procedure will fail
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* with an "Unspecified Reason" error
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*/
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struct smpc_pair_info *pair;
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/**
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* Signature Procedure Information - This structure is allocated at the beginning of a
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* signing procedure. It is freed when a disconnection occurs or at the end of
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* the signing procedure. If not enough memory can be found, the procedure will fail
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* with an "Unspecified Reason" error.
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*/
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struct smpc_sign_info *sign;
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} info;
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/// CSRK values (Local and remote)
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struct gap_sec_key csrk[SMPC_INFO_MAX];
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/// signature counter values (Local and remote)
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uint32_t sign_counter[SMPC_INFO_MAX];
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/// Repeated Attempt Timer value
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uint16_t rep_att_timer_val;
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/// Encryption key size
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uint8_t key_size;
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/**
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* Contains the current state of the two timers needed in the SMPC task
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* Bit 0 - Is Timeout Timer running
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* Bit 1 - Is Repeated Attempt Timer running
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* Bit 2 - Has task reached a SMP Timeout
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*/
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uint8_t timer_state;
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/// State of the current procedure
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uint8_t state;
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#if (SECURE_CONNECTIONS)
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bool secure_connections_enabled;
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#endif // (SECURE_CONNECTIONS)
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};
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/*
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* GLOBAL VARIABLES DEFINITION
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****************************************************************************************
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*/
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/*
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* MACROS
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****************************************************************************************
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*/
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/*
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* FUNCTION DECLARATIONS
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****************************************************************************************
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*/
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#endif //(BLE_SMPC)
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#endif //SMPC_H_
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/// @} SMPC
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