esp-idf/components/bt/host/bluedroid/stack/smp/smp_utils.c

/******************************************************************************
 *
 *  Copyright (C) 1999-2012 Broadcom Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
******************************************************************************/

/******************************************************************************
 *
 *  This file contains functions for the SMP L2CAP utility functions
 *
 ******************************************************************************/
#include "common/bt_target.h"

#if SMP_INCLUDED == TRUE

#include "stack/bt_types.h"
//#include "bt_utils.h"
#include <string.h>
//#include <ctype.h>
#include "stack/hcidefs.h"
#include "stack/btm_ble_api.h"
#include "stack/l2c_api.h"
#include "l2c_int.h"
#include "smp_int.h"
#include "device/controller.h"
#include "btm_int.h"
#include "common/bte_appl.h"

#define SMP_PAIRING_REQ_SIZE    7
#define SMP_CONFIRM_CMD_SIZE    (BT_OCTET16_LEN + 1)
#define SMP_RAND_CMD_SIZE       (BT_OCTET16_LEN + 1)
#define SMP_INIT_CMD_SIZE       (BT_OCTET16_LEN + 1)
#define SMP_ENC_INFO_SIZE       (BT_OCTET16_LEN + 1)
#define SMP_MASTER_ID_SIZE      (BT_OCTET8_LEN + 2 + 1)
#define SMP_ID_INFO_SIZE        (BT_OCTET16_LEN + 1)
#define SMP_ID_ADDR_SIZE        (BD_ADDR_LEN + 1 + 1)
#define SMP_SIGN_INFO_SIZE      (BT_OCTET16_LEN + 1)
#define SMP_PAIR_FAIL_SIZE      2
#define SMP_SECURITY_REQUEST_SIZE  2
#define SMP_PAIR_PUBL_KEY_SIZE  (1 /* opcode */ + (2*BT_OCTET32_LEN))
#define SMP_PAIR_COMMITM_SIZE           (1 /* opcode */ + BT_OCTET16_LEN /*Commitment*/)
#define SMP_PAIR_DHKEY_CHECK_SIZE       (1 /* opcode */ + BT_OCTET16_LEN /*DHKey Check*/)
#define SMP_PAIR_KEYPR_NOTIF_SIZE       (1 /* opcode */ + 1 /*Notif Type*/)

/* SMP command sizes per spec */
static const UINT8 smp_cmd_size_per_spec[] = {
    0,
    SMP_PAIRING_REQ_SIZE,       /* 0x01: pairing request */
    SMP_PAIRING_REQ_SIZE,       /* 0x02: pairing response */
    SMP_CONFIRM_CMD_SIZE,       /* 0x03: pairing confirm */
    SMP_RAND_CMD_SIZE,          /* 0x04: pairing random */
    SMP_PAIR_FAIL_SIZE,         /* 0x05: pairing failed */
    SMP_ENC_INFO_SIZE,          /* 0x06: encryption information */
    SMP_MASTER_ID_SIZE,         /* 0x07: master identification */
    SMP_ID_INFO_SIZE,           /* 0x08: identity information */
    SMP_ID_ADDR_SIZE,           /* 0x09: identity address information */
    SMP_SIGN_INFO_SIZE,         /* 0x0A: signing information */
    SMP_SECURITY_REQUEST_SIZE,  /* 0x0B: security request */
    SMP_PAIR_PUBL_KEY_SIZE,     /* 0x0C: pairing public key */
    SMP_PAIR_DHKEY_CHECK_SIZE,  /* 0x0D: pairing dhkey check */
    SMP_PAIR_KEYPR_NOTIF_SIZE,  /* 0x0E: pairing keypress notification */
    SMP_PAIR_COMMITM_SIZE       /* 0x0F: pairing commitment */
};

static BOOLEAN smp_parameter_unconditionally_valid(tSMP_CB *p_cb);
static BOOLEAN smp_parameter_unconditionally_invalid(tSMP_CB *p_cb);

/* type for SMP command length validation functions */
typedef BOOLEAN (*tSMP_CMD_LEN_VALID)(tSMP_CB *p_cb);

static BOOLEAN smp_command_has_valid_fixed_length(tSMP_CB *p_cb);

static const tSMP_CMD_LEN_VALID smp_cmd_len_is_valid[] = {
    smp_parameter_unconditionally_invalid,
    smp_command_has_valid_fixed_length, /* 0x01: pairing request */
    smp_command_has_valid_fixed_length, /* 0x02: pairing response */
    smp_command_has_valid_fixed_length, /* 0x03: pairing confirm */
    smp_command_has_valid_fixed_length, /* 0x04: pairing random */
    smp_command_has_valid_fixed_length, /* 0x05: pairing failed */
    smp_command_has_valid_fixed_length, /* 0x06: encryption information */
    smp_command_has_valid_fixed_length, /* 0x07: master identification */
    smp_command_has_valid_fixed_length, /* 0x08: identity information */
    smp_command_has_valid_fixed_length, /* 0x09: identity address information */
    smp_command_has_valid_fixed_length, /* 0x0A: signing information */
    smp_command_has_valid_fixed_length, /* 0x0B: security request */
    smp_command_has_valid_fixed_length, /* 0x0C: pairing public key */
    smp_command_has_valid_fixed_length, /* 0x0D: pairing dhkey check */
    smp_command_has_valid_fixed_length, /* 0x0E: pairing keypress notification */
    smp_command_has_valid_fixed_length  /* 0x0F: pairing commitment */
};

/* type for SMP command parameter ranges validation functions */
typedef BOOLEAN (*tSMP_CMD_PARAM_RANGES_VALID)(tSMP_CB *p_cb);

static BOOLEAN smp_pairing_request_response_parameters_are_valid(tSMP_CB *p_cb);
static BOOLEAN smp_pairing_keypress_notification_is_valid(tSMP_CB *p_cb);

static const tSMP_CMD_PARAM_RANGES_VALID smp_cmd_param_ranges_are_valid[] = {
    smp_parameter_unconditionally_invalid,
    smp_pairing_request_response_parameters_are_valid, /* 0x01: pairing request */
    smp_pairing_request_response_parameters_are_valid, /* 0x02: pairing response */
    smp_parameter_unconditionally_valid, /* 0x03: pairing confirm */
    smp_parameter_unconditionally_valid, /* 0x04: pairing random */
    smp_parameter_unconditionally_valid, /* 0x05: pairing failed */
    smp_parameter_unconditionally_valid, /* 0x06: encryption information */
    smp_parameter_unconditionally_valid, /* 0x07: master identification */
    smp_parameter_unconditionally_valid, /* 0x08: identity information */
    smp_parameter_unconditionally_valid, /* 0x09: identity address information */
    smp_parameter_unconditionally_valid, /* 0x0A: signing information */
    smp_parameter_unconditionally_valid, /* 0x0B: security request */
    smp_parameter_unconditionally_valid, /* 0x0C: pairing public key */
    smp_parameter_unconditionally_valid, /* 0x0D: pairing dhkey check */
    smp_pairing_keypress_notification_is_valid, /* 0x0E: pairing keypress notification */
    smp_parameter_unconditionally_valid /* 0x0F: pairing commitment */
};

/* type for action functions */
typedef BT_HDR *(*tSMP_CMD_ACT)(UINT8 cmd_code, tSMP_CB *p_cb);

static BT_HDR *smp_build_pairing_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_confirm_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_rand_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_pairing_fail(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_identity_info_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_encrypt_info_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_security_request(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_signing_info_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_master_id_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_id_addr_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_pair_public_key_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_pairing_commitment_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_pair_dhkey_check_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_pairing_keypress_notification_cmd(UINT8 cmd_code, tSMP_CB *p_cb);

static const tSMP_CMD_ACT smp_cmd_build_act[] = {
    NULL,
    smp_build_pairing_cmd,          /* 0x01: pairing request */
    smp_build_pairing_cmd,          /* 0x02: pairing response */
    smp_build_confirm_cmd,          /* 0x03: pairing confirm */
    smp_build_rand_cmd,             /* 0x04: pairing random */
    smp_build_pairing_fail,         /* 0x05: pairing failure */
    smp_build_encrypt_info_cmd,     /* 0x06: encryption information */
    smp_build_master_id_cmd,        /* 0x07: master identification */
    smp_build_identity_info_cmd,    /* 0x08: identity information */
    smp_build_id_addr_cmd,          /* 0x09: identity address information */
    smp_build_signing_info_cmd,     /* 0x0A: signing information */
    smp_build_security_request,     /* 0x0B: security request */
    smp_build_pair_public_key_cmd,  /* 0x0C: pairing public key */
    smp_build_pair_dhkey_check_cmd, /* 0x0D: pairing DHKey check */
    smp_build_pairing_keypress_notification_cmd, /* 0x0E: pairing keypress notification */
    smp_build_pairing_commitment_cmd /* 0x0F: pairing commitment */
};

static const UINT8 smp_association_table[2][SMP_IO_CAP_MAX][SMP_IO_CAP_MAX] = {
    /* display only */    /* Display Yes/No */   /* keyboard only */
    /* No Input/Output */ /* keyboard display */

    /* initiator */
    /* model = tbl[peer_io_caps][loc_io_caps] */
    /* Display Only */
    {   {
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY,
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY
        },

        /* Display Yes/No */
        {
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY,
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY
        },

        /* Keyboard only */
        {
            SMP_MODEL_KEY_NOTIF, SMP_MODEL_KEY_NOTIF, SMP_MODEL_PASSKEY,
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF
        },

        /* No Input No Output */
        {
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY,
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY
        },

        /* keyboard display */
        {
            SMP_MODEL_KEY_NOTIF, SMP_MODEL_KEY_NOTIF, SMP_MODEL_PASSKEY,
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF
        }
    },

    /* responder */
    /* model = tbl[loc_io_caps][peer_io_caps] */
    /* Display Only */
    {   {
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF,
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF
        },

        /* Display Yes/No */
        {
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF,
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF
        },

        /* keyboard only */
        {
            SMP_MODEL_PASSKEY, SMP_MODEL_PASSKEY, SMP_MODEL_PASSKEY,
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY
        },

        /* No Input No Output */
        {
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY,
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY
        },

        /* keyboard display */
        {
            SMP_MODEL_PASSKEY, SMP_MODEL_PASSKEY, SMP_MODEL_KEY_NOTIF,
            SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY
        }
    }
};

static const UINT8 smp_association_table_sc[2][SMP_IO_CAP_MAX][SMP_IO_CAP_MAX] = {
    /* display only */    /* Display Yes/No */   /* keyboard only */
    /* No InputOutput */  /* keyboard display */

    /* initiator */
    /* model = tbl[peer_io_caps][loc_io_caps] */

    /* Display Only */
    {   {
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_PASSKEY_ENT,
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_PASSKEY_ENT
        },

        /* Display Yes/No */
        {
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_NUM_COMP, SMP_MODEL_SEC_CONN_PASSKEY_ENT,
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_NUM_COMP
        },

        /* keyboard only */
        {
            SMP_MODEL_SEC_CONN_PASSKEY_DISP, SMP_MODEL_SEC_CONN_PASSKEY_DISP, SMP_MODEL_SEC_CONN_PASSKEY_ENT,
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_PASSKEY_DISP
        },

        /* No Input No Output */
        {
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS,
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS
        },

        /* keyboard display */
        {
            SMP_MODEL_SEC_CONN_PASSKEY_DISP, SMP_MODEL_SEC_CONN_NUM_COMP, SMP_MODEL_SEC_CONN_PASSKEY_ENT,
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_NUM_COMP
        }
    },

    /* responder */
    /* model = tbl[loc_io_caps][peer_io_caps] */

    /* Display Only */
    {   {
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_PASSKEY_DISP,
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_PASSKEY_DISP
        },

        /* Display Yes/No */
        {
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_NUM_COMP, SMP_MODEL_SEC_CONN_PASSKEY_DISP,
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_NUM_COMP
        },

        /* keyboard only */
        {
            SMP_MODEL_SEC_CONN_PASSKEY_ENT, SMP_MODEL_SEC_CONN_PASSKEY_ENT, SMP_MODEL_SEC_CONN_PASSKEY_ENT,
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_PASSKEY_ENT
        },

        /* No Input No Output */
        {
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS,
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS
        },

        /* keyboard display */
        {
            SMP_MODEL_SEC_CONN_PASSKEY_ENT, SMP_MODEL_SEC_CONN_NUM_COMP, SMP_MODEL_SEC_CONN_PASSKEY_DISP,
            SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_NUM_COMP
        }
    }
};

static tSMP_ASSO_MODEL smp_select_legacy_association_model(tSMP_CB *p_cb);
static tSMP_ASSO_MODEL smp_select_association_model_secure_connections(tSMP_CB *p_cb);

/*******************************************************************************
**
** Function         smp_send_msg_to_L2CAP
**
** Description      Send message to L2CAP.
**
*******************************************************************************/
BOOLEAN  smp_send_msg_to_L2CAP(BD_ADDR rem_bda, BT_HDR *p_toL2CAP)
{
    UINT16 l2cap_ret;
    UINT16 fixed_cid = L2CAP_SMP_CID;

    if (smp_cb.smp_over_br) {
        fixed_cid = L2CAP_SMP_BR_CID;
    }

    SMP_TRACE_EVENT("%s", __FUNCTION__);
    smp_cb.total_tx_unacked += 1;

    if ((l2cap_ret = L2CA_SendFixedChnlData (fixed_cid, rem_bda, p_toL2CAP)) == L2CAP_DW_FAILED) {
        smp_cb.total_tx_unacked -= 1;
        SMP_TRACE_ERROR("SMP   failed to pass msg:0x%0x to L2CAP",
                        *((UINT8 *)(p_toL2CAP + 1) + p_toL2CAP->offset));
        return FALSE;
    } else {
        return TRUE;
    }
}

/*******************************************************************************
**
** Function         smp_send_cmd
**
** Description      send a SMP command on L2CAP channel.
**
*******************************************************************************/
BOOLEAN smp_send_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR *p_buf;
    BOOLEAN sent = FALSE;
    UINT8 failure = SMP_PAIR_INTERNAL_ERR;
    SMP_TRACE_EVENT("smp_send_cmd on l2cap cmd_code=0x%x\n", cmd_code);
    if ( cmd_code <= (SMP_OPCODE_MAX + 1 /* for SMP_OPCODE_PAIR_COMMITM */) &&
            smp_cmd_build_act[cmd_code] != NULL) {
        p_buf = (*smp_cmd_build_act[cmd_code])(cmd_code, p_cb);

        if (p_buf != NULL &&
                smp_send_msg_to_L2CAP(p_cb->pairing_bda, p_buf)) {
            sent = TRUE;

            btu_stop_timer (&p_cb->rsp_timer_ent);
            btu_start_timer (&p_cb->rsp_timer_ent, BTU_TTYPE_SMP_PAIRING_CMD,
                             SMP_WAIT_FOR_RSP_TOUT);
        }
    }

    if (!sent) {
        if (p_cb->smp_over_br) {
#if (CLASSIC_BT_INCLUDED == TRUE)
            smp_br_state_machine_event(p_cb, SMP_BR_AUTH_CMPL_EVT, &failure);
#endif  ///CLASSIC_BT_INCLUDED == TRUE
        } else {
            smp_sm_event(p_cb, SMP_AUTH_CMPL_EVT, &failure);
        }
    }
    return sent;
}

/*******************************************************************************
**
** Function         smp_rsp_timeout
**
** Description      Called when SMP wait for SMP command response timer expires
**
** Returns          void
**
*******************************************************************************/
void smp_rsp_timeout(TIMER_LIST_ENT *p_tle)
{
    tSMP_CB   *p_cb = &smp_cb;
    UINT8 failure = SMP_RSP_TIMEOUT;
    UNUSED(p_tle);

    SMP_TRACE_EVENT("%s state:%d br_state:%d", __FUNCTION__, p_cb->state, p_cb->br_state);

    if (p_cb->smp_over_br) {
#if (CLASSIC_BT_INCLUDED == TRUE)
        smp_br_state_machine_event(p_cb, SMP_BR_AUTH_CMPL_EVT, &failure);
#endif  ///CLASSIC_BT_INCLUDED == TRUE
    } else {
        smp_sm_event(p_cb, SMP_AUTH_CMPL_EVT, &failure);
    }
}

/*******************************************************************************
**
** Function         smp_build_pairing_req_cmd
**
** Description      Build pairing request command.
**
*******************************************************************************/
BT_HDR *smp_build_pairing_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR      *p_buf = NULL ;
    UINT8       *p;

    SMP_TRACE_EVENT("smp_build_pairing_cmd");
    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR) + SMP_PAIRING_REQ_SIZE + L2CAP_MIN_OFFSET)) != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        UINT8_TO_STREAM (p, cmd_code);
        UINT8_TO_STREAM (p, p_cb->local_io_capability);
        UINT8_TO_STREAM (p, p_cb->loc_oob_flag);
        UINT8_TO_STREAM (p, p_cb->loc_auth_req);
        UINT8_TO_STREAM (p, p_cb->loc_enc_size);
        UINT8_TO_STREAM (p, p_cb->local_i_key);
        UINT8_TO_STREAM (p, p_cb->local_r_key);

        p_buf->offset = L2CAP_MIN_OFFSET;
        /* 1B ERR_RSP op code + 1B cmd_op_code + 2B handle + 1B status */
        p_buf->len = SMP_PAIRING_REQ_SIZE;
    }

    return p_buf;
}

/*******************************************************************************
**
** Function         smp_build_confirm_cmd
**
** Description      Build confirm request command.
**
*******************************************************************************/
static BT_HDR *smp_build_confirm_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR      *p_buf = NULL ;
    UINT8       *p;
    UNUSED(cmd_code);

    SMP_TRACE_EVENT("smp_build_confirm_cmd\n");
    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR) + SMP_CONFIRM_CMD_SIZE + L2CAP_MIN_OFFSET)) != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        UINT8_TO_STREAM (p, SMP_OPCODE_CONFIRM);
        ARRAY_TO_STREAM (p, p_cb->confirm, BT_OCTET16_LEN);

        p_buf->offset = L2CAP_MIN_OFFSET;
        p_buf->len = SMP_CONFIRM_CMD_SIZE;
    }

    return p_buf;
}
/*******************************************************************************
**
** Function         smp_build_rand_cmd
**
** Description      Build Random command.
**
*******************************************************************************/
static BT_HDR *smp_build_rand_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR      *p_buf = NULL ;
    UINT8       *p;
    UNUSED(cmd_code);

    SMP_TRACE_EVENT("%s\n", __func__);
    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR) + SMP_RAND_CMD_SIZE + L2CAP_MIN_OFFSET))
            != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        UINT8_TO_STREAM (p, SMP_OPCODE_RAND);
        ARRAY_TO_STREAM (p, p_cb->rand, BT_OCTET16_LEN);

        p_buf->offset = L2CAP_MIN_OFFSET;
        p_buf->len = SMP_RAND_CMD_SIZE;
    }

    return p_buf;
}
/*******************************************************************************
**
** Function         smp_build_encrypt_info_cmd
**
** Description      Build security information command.
**
*******************************************************************************/
static BT_HDR *smp_build_encrypt_info_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR      *p_buf = NULL ;
    UINT8       *p;
    UNUSED(cmd_code);

    SMP_TRACE_EVENT("smp_build_encrypt_info_cmd\n");
    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR) + SMP_ENC_INFO_SIZE + L2CAP_MIN_OFFSET)) != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        UINT8_TO_STREAM (p, SMP_OPCODE_ENCRYPT_INFO);
        ARRAY_TO_STREAM (p, p_cb->ltk, BT_OCTET16_LEN);

        p_buf->offset = L2CAP_MIN_OFFSET;
        p_buf->len = SMP_ENC_INFO_SIZE;
    }

    return p_buf;
}

/*******************************************************************************
**
** Function         smp_build_master_id_cmd
**
** Description      Build security information command.
**
*******************************************************************************/
static BT_HDR *smp_build_master_id_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR      *p_buf = NULL ;
    UINT8       *p;
    UNUSED(cmd_code);

    SMP_TRACE_EVENT("%s\n", __func__);

    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR) + SMP_MASTER_ID_SIZE + L2CAP_MIN_OFFSET)) != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        UINT8_TO_STREAM (p, SMP_OPCODE_MASTER_ID);
        UINT16_TO_STREAM (p, p_cb->ediv);
        ARRAY_TO_STREAM (p, p_cb->enc_rand, BT_OCTET8_LEN);

        p_buf->offset = L2CAP_MIN_OFFSET;
        p_buf->len = SMP_MASTER_ID_SIZE;
    }

    return p_buf;
}

/*******************************************************************************
**
** Function         smp_build_identity_info_cmd
**
** Description      Build identity information command.
**
*******************************************************************************/
static BT_HDR *smp_build_identity_info_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR      *p_buf = NULL ;
#if (BLE_INCLUDED == TRUE)
    UINT8       *p;
    BT_OCTET16  irk;
    UNUSED(cmd_code);
    UNUSED(p_cb);

    SMP_TRACE_EVENT("smp_build_identity_info_cmd\n");
    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR) + SMP_ID_INFO_SIZE + L2CAP_MIN_OFFSET)) != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        BTM_GetDeviceIDRoot(irk);

        UINT8_TO_STREAM (p, SMP_OPCODE_IDENTITY_INFO);
        ARRAY_TO_STREAM (p,  irk, BT_OCTET16_LEN);

        p_buf->offset = L2CAP_MIN_OFFSET;
        p_buf->len = SMP_ID_INFO_SIZE;
    }

#endif  ///BLE_INCLUDED == TRUE
    return p_buf;
}

/*******************************************************************************
**
** Function         smp_build_id_addr_cmd
**
** Description      Build identity address information command.
**
*******************************************************************************/
static BT_HDR *smp_build_id_addr_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR *p_buf = NULL;
    UINT8 *p;

    UNUSED(cmd_code);
    UNUSED(p_cb);
    SMP_TRACE_EVENT("smp_build_id_addr_cmd\n");
    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR) + SMP_ID_ADDR_SIZE + L2CAP_MIN_OFFSET)) != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        UINT8_TO_STREAM (p, SMP_OPCODE_ID_ADDR);
        /* Identity Address Information is used in the Transport Specific Key Distribution phase to distribute
        its public device address or static random address. if slave using static random address is encrypted,
        it should distribute its static random address */
#if (BLE_INCLUDED == TRUE)
        if(btm_cb.ble_ctr_cb.addr_mgnt_cb.own_addr_type == BLE_ADDR_RANDOM && memcmp(btm_cb.ble_ctr_cb.addr_mgnt_cb.static_rand_addr, btm_cb.ble_ctr_cb.addr_mgnt_cb.private_addr,6) == 0) {
            UINT8_TO_STREAM (p, 0x01);
            BDADDR_TO_STREAM (p, btm_cb.ble_ctr_cb.addr_mgnt_cb.static_rand_addr);
        } else
#endif  ///BLE_INCLUDED == TRUE
        {
            UINT8_TO_STREAM (p, 0);
            BDADDR_TO_STREAM (p, controller_get_interface()->get_address()->address);
        }

        p_buf->offset = L2CAP_MIN_OFFSET;
        p_buf->len = SMP_ID_ADDR_SIZE;
    }

    return p_buf;
}

/*******************************************************************************
**
** Function         smp_build_signing_info_cmd
**
** Description      Build signing information command.
**
*******************************************************************************/
static BT_HDR *smp_build_signing_info_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR      *p_buf = NULL ;
    UINT8       *p;
    UNUSED(cmd_code);

    SMP_TRACE_EVENT("smp_build_signing_info_cmd\n");
    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR) + SMP_SIGN_INFO_SIZE + L2CAP_MIN_OFFSET)) != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        UINT8_TO_STREAM (p, SMP_OPCODE_SIGN_INFO);
        ARRAY_TO_STREAM (p, p_cb->csrk, BT_OCTET16_LEN);

        p_buf->offset = L2CAP_MIN_OFFSET;
        p_buf->len = SMP_SIGN_INFO_SIZE;
    }

    return p_buf;
}

/*******************************************************************************
**
** Function         smp_build_pairing_fail
**
** Description      Build Pairing Fail command.
**
*******************************************************************************/
static BT_HDR *smp_build_pairing_fail(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR      *p_buf = NULL ;
    UINT8       *p;
    UNUSED(cmd_code);

    SMP_TRACE_EVENT("%s\n", __func__);
    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR) + SMP_PAIR_FAIL_SIZE + L2CAP_MIN_OFFSET)) != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        UINT8_TO_STREAM (p, SMP_OPCODE_PAIRING_FAILED);
        UINT8_TO_STREAM (p, p_cb->failure);

        p_buf->offset = L2CAP_MIN_OFFSET;
        p_buf->len = SMP_PAIR_FAIL_SIZE;
    }

    return p_buf;
}

/*******************************************************************************
**
** Function         smp_build_security_request
**
** Description      Build security request command.
**
*******************************************************************************/
static BT_HDR *smp_build_security_request(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR      *p_buf = NULL ;
    UINT8       *p;
    UNUSED(cmd_code);

    SMP_TRACE_EVENT("%s\n", __func__);
    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR) + 2 + L2CAP_MIN_OFFSET)) != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        UINT8_TO_STREAM (p, SMP_OPCODE_SEC_REQ);
        UINT8_TO_STREAM (p,  p_cb->loc_auth_req);

        p_buf->offset = L2CAP_MIN_OFFSET;
        p_buf->len = SMP_SECURITY_REQUEST_SIZE;

        SMP_TRACE_EVENT("opcode=%d auth_req=0x%x", SMP_OPCODE_SEC_REQ,  p_cb->loc_auth_req );
    }

    return p_buf;

}

/*******************************************************************************
**
** Function         smp_build_pair_public_key_cmd
**
** Description      Build pairing public key command.
**
*******************************************************************************/
static BT_HDR *smp_build_pair_public_key_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR  *p_buf = NULL ;
    UINT8   *p;
    UINT8   publ_key[2 * BT_OCTET32_LEN];
    UINT8   *p_publ_key = publ_key;
    UNUSED(cmd_code);

    SMP_TRACE_EVENT("%s\n", __FUNCTION__);

    memcpy(p_publ_key, p_cb->loc_publ_key.x, BT_OCTET32_LEN);
    memcpy(p_publ_key + BT_OCTET32_LEN, p_cb->loc_publ_key.y, BT_OCTET32_LEN);

    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR) +
                                      SMP_PAIR_PUBL_KEY_SIZE + L2CAP_MIN_OFFSET)) != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        UINT8_TO_STREAM (p, SMP_OPCODE_PAIR_PUBLIC_KEY);
        ARRAY_TO_STREAM (p, p_publ_key, 2 * BT_OCTET32_LEN);

        p_buf->offset = L2CAP_MIN_OFFSET;
        p_buf->len = SMP_PAIR_PUBL_KEY_SIZE;
    }

    return p_buf;
}

/*******************************************************************************
**
** Function         smp_build_pairing_commitment_cmd
**
** Description      Build pairing commitment command.
**
*******************************************************************************/
static BT_HDR *smp_build_pairing_commitment_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR *p_buf = NULL;
    UINT8 *p;
    UNUSED(cmd_code);

    SMP_TRACE_EVENT("%s\n", __func__);
    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR) + SMP_PAIR_COMMITM_SIZE + L2CAP_MIN_OFFSET))
            != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        UINT8_TO_STREAM (p, SMP_OPCODE_CONFIRM);
        ARRAY_TO_STREAM (p, p_cb->commitment, BT_OCTET16_LEN);

        p_buf->offset = L2CAP_MIN_OFFSET;
        p_buf->len = SMP_PAIR_COMMITM_SIZE;
    }

    return p_buf;
}

/*******************************************************************************
**
** Function         smp_build_pair_dhkey_check_cmd
**
** Description      Build pairing DHKey check command.
**
*******************************************************************************/
static BT_HDR *smp_build_pair_dhkey_check_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR *p_buf = NULL;
    UINT8 *p;
    UNUSED(cmd_code);

    SMP_TRACE_EVENT("%s\n", __FUNCTION__);
    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR) +
                                      SMP_PAIR_DHKEY_CHECK_SIZE + L2CAP_MIN_OFFSET)) != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        UINT8_TO_STREAM (p, SMP_OPCODE_PAIR_DHKEY_CHECK);
        ARRAY_TO_STREAM (p, p_cb->dhkey_check, BT_OCTET16_LEN);

        p_buf->offset = L2CAP_MIN_OFFSET;
        p_buf->len = SMP_PAIR_DHKEY_CHECK_SIZE;
    }

    return p_buf;
}

/*******************************************************************************
**
** Function         smp_build_pairing_keypress_notification_cmd
**
** Description      Build keypress notification command.
**
*******************************************************************************/
static BT_HDR *smp_build_pairing_keypress_notification_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
    BT_HDR      *p_buf = NULL ;
    UINT8       *p;
    UNUSED(cmd_code);

    SMP_TRACE_EVENT("%s\n", __FUNCTION__);
    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR)\
                                      + SMP_PAIR_KEYPR_NOTIF_SIZE + L2CAP_MIN_OFFSET)) != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        UINT8_TO_STREAM (p, SMP_OPCODE_PAIR_KEYPR_NOTIF);
        UINT8_TO_STREAM (p, p_cb->local_keypress_notification);

        p_buf->offset = L2CAP_MIN_OFFSET;
        p_buf->len = SMP_PAIR_KEYPR_NOTIF_SIZE;
    }

    return p_buf;
}

/*******************************************************************************
**
** Function         smp_convert_string_to_tk
**
** Description      This function is called to convert a 6 to 16 digits numeric
**                  character string into SMP TK.
**
**
** Returns          void
**
*******************************************************************************/
void smp_convert_string_to_tk(BT_OCTET16 tk, UINT32 passkey)
{
    UINT8   *p = tk;
    tSMP_KEY    key;
    SMP_TRACE_EVENT("smp_convert_string_to_tk\n");
    UINT32_TO_STREAM(p, passkey);

    key.key_type    = SMP_KEY_TYPE_TK;
    key.p_data      = tk;

    smp_sm_event(&smp_cb, SMP_KEY_READY_EVT, &key);
}

/*******************************************************************************
**
** Function         smp_mask_enc_key
**
** Description      This function is called to mask off the encryption key based
**                  on the maximum encryption key size.
**
**
** Returns          void
**
*******************************************************************************/
void smp_mask_enc_key(UINT8 loc_enc_size, UINT8 *p_data)
{
    SMP_TRACE_EVENT("smp_mask_enc_key\n");
    if (loc_enc_size < BT_OCTET16_LEN) {
        for (; loc_enc_size < BT_OCTET16_LEN; loc_enc_size ++) {
            * (p_data + loc_enc_size) = 0;
        }
    }
    return;
}

/*******************************************************************************
**
** Function         smp_xor_128
**
** Description      utility function to do an biteise exclusive-OR of two bit
**                  strings of the length of BT_OCTET16_LEN.
**
** Returns          void
**
*******************************************************************************/
void smp_xor_128(BT_OCTET16 a, const BT_OCTET16 b)
{
    UINT8 i, *aa = a;
    const UINT8 *bb = b;

    SMP_TRACE_EVENT("smp_xor_128\n");
    for (i = 0; i < BT_OCTET16_LEN; i++) {
        aa[i] = aa[i] ^ bb[i];
    }
}

/*******************************************************************************
**
** Function         smp_cb_cleanup
**
** Description      Clean up SMP control block
**
** Returns          void
**
*******************************************************************************/
void smp_cb_cleanup(tSMP_CB *p_cb)
{
    tSMP_CALLBACK   *p_callback = p_cb->p_callback;
    UINT8           trace_level = p_cb->trace_level;
    UINT32          static_passkey = p_cb->static_passkey;
    BOOLEAN         use_static_passkey = p_cb->use_static_passkey;
    SMP_TRACE_EVENT("smp_cb_cleanup\n");

    memset(p_cb, 0, sizeof(tSMP_CB));
    p_cb->p_callback = p_callback;
    p_cb->trace_level = trace_level;
    if(use_static_passkey) {
        p_cb->use_static_passkey = use_static_passkey;
        p_cb->static_passkey = static_passkey;
    }
}

/*******************************************************************************
**
** Function         smp_remove_fixed_channel
**
** Description      This function is called to remove the fixed channel
**
** Returns          void
**
*******************************************************************************/
void smp_remove_fixed_channel(tSMP_CB *p_cb)
{
    SMP_TRACE_DEBUG("%s\n", __func__);

    if (p_cb->smp_over_br) {
        L2CA_RemoveFixedChnl (L2CAP_SMP_BR_CID, p_cb->pairing_bda);
    } else {
        L2CA_RemoveFixedChnl (L2CAP_SMP_CID, p_cb->pairing_bda);
    }
}

/*******************************************************************************
**
** Function         smp_reset_control_value
**
** Description      This function is called to reset the control block value when
**                  pairing procedure finished.
**
**
** Returns          void
**
*******************************************************************************/
void smp_reset_control_value(tSMP_CB *p_cb)
{
    SMP_TRACE_EVENT("smp_reset_control_value\n");
    btu_stop_timer (&p_cb->rsp_timer_ent);
    p_cb->flags = 0;
    /* set the link idle timer to drop the link when pairing is done
       usually service discovery will follow authentication complete, to avoid
       racing condition for a link down/up, set link idle timer to be
       SMP_LINK_TOUT_MIN to guarantee SMP key exchange */
    L2CA_SetIdleTimeoutByBdAddr(p_cb->pairing_bda, SMP_LINK_TOUT_MIN, BT_TRANSPORT_LE);

    /* We can tell L2CAP to remove the fixed channel (if it has one) */
    smp_remove_fixed_channel(p_cb);
    smp_cb_cleanup(p_cb);
}

/*******************************************************************************
**
** Function         smp_proc_pairing_cmpl
**
** Description      This function is called to process pairing complete
**
**
** Returns          void
**
*******************************************************************************/
void smp_proc_pairing_cmpl(tSMP_CB *p_cb)
{
    tSMP_EVT_DATA   evt_data = {0};
    tSMP_CALLBACK   *p_callback = p_cb->p_callback;
    BD_ADDR         pairing_bda;

    SMP_TRACE_DEBUG ("smp_proc_pairing_cmpl \n");

    evt_data.cmplt.reason = p_cb->status;
    evt_data.cmplt.smp_over_br = p_cb->smp_over_br;
    evt_data.cmplt.auth_mode = 0;
#if (BLE_INCLUDED == TRUE)
    tBTM_SEC_DEV_REC    *p_rec = btm_find_dev (p_cb->pairing_bda);
    if (p_cb->status == SMP_SUCCESS) {
        evt_data.cmplt.sec_level = p_cb->sec_level;
        if (p_cb->auth_mode) { // the first encryption
            evt_data.cmplt.auth_mode = p_cb->auth_mode;
            if (p_rec) {
                p_rec->ble.auth_mode = p_cb->auth_mode;
            }
        } else if (p_rec) {
            evt_data.cmplt.auth_mode =  p_rec->ble.auth_mode;
        }
    }
#else
    if (p_cb->status == SMP_SUCCESS) {
        evt_data.cmplt.sec_level = p_cb->sec_level;
        evt_data.cmplt.auth_mode = p_cb->auth_mode;
    }
#endif

    evt_data.cmplt.is_pair_cancel  = FALSE;

    if (p_cb->is_pair_cancel) {
        evt_data.cmplt.is_pair_cancel = TRUE;
    }


    SMP_TRACE_DEBUG ("send SMP_COMPLT_EVT reason=0x%0x sec_level=0x%0x\n",
                     evt_data.cmplt.reason,
                     evt_data.cmplt.sec_level );

    memcpy (pairing_bda, p_cb->pairing_bda, BD_ADDR_LEN);

#if (BLE_INCLUDED == TRUE)
#if (SMP_SLAVE_CON_PARAMS_UPD_ENABLE == TRUE)
    if (p_cb->role == HCI_ROLE_SLAVE) {
        if(p_rec && p_rec->ble.skip_update_conn_param) {
            //clear flag
            p_rec->ble.skip_update_conn_param = false;
        } else {
            L2CA_EnableUpdateBleConnParams(p_cb->pairing_bda, TRUE);
        }
    }

#endif
#endif  ///BLE_INCLUDED == TRUE

    smp_reset_control_value(p_cb);

    if (p_callback) {
        (*p_callback) (SMP_COMPLT_EVT, pairing_bda, &evt_data);
    }
}

/*******************************************************************************
**
** Function         smp_command_has_invalid_parameters
**
** Description      Checks if the received SMP command has invalid parameters i.e.
**                  if the command length is valid and the command parameters are
**                  inside specified range.
**                  It returns TRUE if the command has invalid parameters.
**
** Returns          TRUE if the command has invalid parameters, FALSE otherwise.
**
*******************************************************************************/
BOOLEAN smp_command_has_invalid_parameters(tSMP_CB *p_cb)
{
    UINT8 cmd_code = p_cb->rcvd_cmd_code;

    SMP_TRACE_DEBUG("%s for cmd code 0x%02x\n", __func__, cmd_code);

    if ((cmd_code > (SMP_OPCODE_MAX + 1 /* for SMP_OPCODE_PAIR_COMMITM */)) ||
            (cmd_code < SMP_OPCODE_MIN)) {
        SMP_TRACE_WARNING("Somehow received command with the RESERVED code 0x%02x\n", cmd_code);
        return TRUE;
    }

    if (!(*smp_cmd_len_is_valid[cmd_code])(p_cb)) {
        return TRUE;
    }

    if (!(*smp_cmd_param_ranges_are_valid[cmd_code])(p_cb)) {
        return TRUE;
    }

    return FALSE;
}

/*******************************************************************************
**
** Function         smp_command_has_valid_fixed_length
**
** Description      Checks if the received command size is equal to the size
**                  according to specs.
**
** Returns          TRUE if the command size is as expected, FALSE otherwise.
**
** Note             The command is expected to have fixed length.
*******************************************************************************/
BOOLEAN smp_command_has_valid_fixed_length(tSMP_CB *p_cb)
{
    UINT8   cmd_code = p_cb->rcvd_cmd_code;

    SMP_TRACE_DEBUG("%s for cmd code 0x%02x\n", __func__, cmd_code);

    if (p_cb->rcvd_cmd_len != smp_cmd_size_per_spec[cmd_code]) {
        SMP_TRACE_WARNING("Rcvd from the peer cmd 0x%02x with invalid length\
            0x%02x (per spec the length is 0x%02x).\n",
                          cmd_code, p_cb->rcvd_cmd_len, smp_cmd_size_per_spec[cmd_code]);
        return FALSE;
    }

    return TRUE;
}

/*******************************************************************************
**
** Function         smp_pairing_request_response_parameters_are_valid
**
** Description      Validates parameter ranges in the received SMP command
**                  pairing request or pairing response.
**                  The parameters to validate:
**                  IO capability,
**                  OOB data flag,
**                  Bonding_flags in AuthReq
**                  Maximum encryption key size.
**                  Returns FALSE if at least one of these parameters is out of range.
**
*******************************************************************************/
BOOLEAN smp_pairing_request_response_parameters_are_valid(tSMP_CB *p_cb)
{
    UINT8   io_caps = p_cb->peer_io_caps;
    UINT8   oob_flag = p_cb->peer_oob_flag;
    UINT8   bond_flag = p_cb->peer_auth_req & 0x03; //0x03 is gen bond with appropriate mask
    UINT8   enc_size = p_cb->peer_enc_size;

    SMP_TRACE_DEBUG("%s for cmd code 0x%02x\n", __func__, p_cb->rcvd_cmd_code);

    if (io_caps >= BTM_IO_CAP_MAX) {
        SMP_TRACE_WARNING("Rcvd from the peer cmd 0x%02x with IO Capabilty \
            value (0x%02x) out of range).\n",
                          p_cb->rcvd_cmd_code, io_caps);
        return FALSE;
    }

    if (!((oob_flag == SMP_OOB_NONE) || (oob_flag == SMP_OOB_PRESENT))) {
        SMP_TRACE_WARNING("Rcvd from the peer cmd 0x%02x with OOB data flag value \
            (0x%02x) out of range).\n",
                          p_cb->rcvd_cmd_code, oob_flag);
        return FALSE;
    }

    if (!((bond_flag == SMP_AUTH_NO_BOND) || (bond_flag == SMP_AUTH_BOND))) {
        SMP_TRACE_WARNING("Rcvd from the peer cmd 0x%02x with Bonding_Flags value (0x%02x)\
                           out of range).\n",
                          p_cb->rcvd_cmd_code, bond_flag);
        return FALSE;
    }

    /* `bte_appl_cfg.ble_min_enc_key_size` will be `SMP_ENCR_KEY_SIZE_MIN` by
     * default if not set explicitly  */
#if (BLE_INCLUDED == TRUE)
    if (enc_size < bte_appl_cfg.ble_min_key_size) {
        SMP_TRACE_WARNING("Rcvd from the peer cmd 0x%02x with Maximum Encryption \
            Key value (0x%02x) less than minimum required key size).\n",
                          p_cb->rcvd_cmd_code, enc_size);
        return FALSE;
    }
#else
    if (enc_size < SMP_ENCR_KEY_SIZE_MIN) {
        SMP_TRACE_WARNING("Rcvd from the peer cmd 0x%02x with Maximum Encryption \
            Key value (0x%02x) less than minimum required key size).\n",
                          p_cb->rcvd_cmd_code, enc_size);
        return FALSE;
    }
#endif

    if (enc_size > SMP_ENCR_KEY_SIZE_MAX) {
        SMP_TRACE_WARNING("Rcvd from the peer cmd 0x%02x with Maximum Encryption \
            Key value (0x%02x) greater than supported by stack).\n",
                          p_cb->rcvd_cmd_code, enc_size);
        return FALSE;
    }

    return TRUE;
}

/*******************************************************************************
**
** Function         smp_pairing_keypress_notification_is_valid
**
** Description      Validates Notification Type parameter range in the received SMP command
**                  pairing keypress notification.
**                  Returns FALSE if this parameter is out of range.
**
*******************************************************************************/
BOOLEAN smp_pairing_keypress_notification_is_valid(tSMP_CB *p_cb)
{
    tBTM_SP_KEY_TYPE keypress_notification = p_cb->peer_keypress_notification;

    SMP_TRACE_DEBUG("%s for cmd code 0x%02x\n", __func__, p_cb->rcvd_cmd_code);

    if (keypress_notification >= BTM_SP_KEY_OUT_OF_RANGE) {
        SMP_TRACE_WARNING("Rcvd from the peer cmd 0x%02x with Pairing Keypress \
            Notification value (0x%02x) out of range).\n",
                          p_cb->rcvd_cmd_code, keypress_notification);
        return FALSE;
    }

    return TRUE;
}

/*******************************************************************************
**
** Function         smp_parameter_unconditionally_valid
**
** Description      Always returns TRUE.
**
*******************************************************************************/
BOOLEAN smp_parameter_unconditionally_valid(tSMP_CB *p_cb)
{
    return TRUE;
}

/*******************************************************************************
**
** Function         smp_parameter_unconditionally_invalid
**
** Description      Always returns FALSE.
**
*******************************************************************************/
BOOLEAN smp_parameter_unconditionally_invalid(tSMP_CB *p_cb)
{
    return FALSE;
}

/*******************************************************************************
**
** Function         smp_reject_unexpected_pairing_command
**
** Description      send pairing failure to an unexpected pairing command during
**                  an active pairing process.
**
** Returns          void
**
*******************************************************************************/
void smp_reject_unexpected_pairing_command(BD_ADDR bd_addr)
{
    BT_HDR *p_buf;
    UINT8   *p;

    SMP_TRACE_DEBUG ("%s\n", __FUNCTION__);

    if ((p_buf = (BT_HDR *)osi_malloc(sizeof(BT_HDR) + \
                                      SMP_PAIR_FAIL_SIZE + L2CAP_MIN_OFFSET)) != NULL) {
        p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;

        UINT8_TO_STREAM (p, SMP_OPCODE_PAIRING_FAILED);
        UINT8_TO_STREAM (p, SMP_PAIR_NOT_SUPPORT);

        p_buf->offset = L2CAP_MIN_OFFSET;
        p_buf->len = SMP_PAIR_FAIL_SIZE;

        smp_send_msg_to_L2CAP(bd_addr, p_buf);
    }
}

/*******************************************************************************
** Function         smp_select_association_model
**
** Description      This function selects association model to use for STK
**                  generation. Selection is based on both sides' io capability,
**                  oob data flag and authentication request.
**
** Note             If Secure Connections Only mode is required locally then we
**                  come to this point only if both sides support Secure Connections
**                  mode, i.e. if p_cb->secure_connections_only_mode_required = TRUE then we come
**                  to this point only if
**                      (p_cb->peer_auth_req & SMP_SC_SUPPORT_BIT) ==
**                      (p_cb->loc_auth_req & SMP_SC_SUPPORT_BIT) ==
**                      SMP_SC_SUPPORT_BIT
**
*******************************************************************************/
tSMP_ASSO_MODEL smp_select_association_model(tSMP_CB *p_cb)
{
    tSMP_ASSO_MODEL model = SMP_MODEL_OUT_OF_RANGE;
    p_cb->le_secure_connections_mode_is_used = FALSE;

    SMP_TRACE_EVENT("%s\n", __FUNCTION__);
    SMP_TRACE_DEBUG("%s p_cb->peer_io_caps = %d p_cb->local_io_capability = %d\n",
                    __FUNCTION__, p_cb->peer_io_caps, p_cb->local_io_capability);
    SMP_TRACE_DEBUG("%s p_cb->peer_oob_flag = %d p_cb->loc_oob_flag = %d\n",
                    __FUNCTION__, p_cb->peer_oob_flag, p_cb->loc_oob_flag);
    SMP_TRACE_DEBUG("%s p_cb->peer_auth_req = 0x%02x p_cb->loc_auth_req = 0x%02x\n",
                    __FUNCTION__, p_cb->peer_auth_req, p_cb->loc_auth_req);
    SMP_TRACE_DEBUG("%s p_cb->secure_connections_only_mode_required = %s\n",
                    __FUNCTION__, p_cb->secure_connections_only_mode_required ?
                    "TRUE" : "FALSE");

    if ((p_cb->peer_auth_req & SMP_SC_SUPPORT_BIT) && (p_cb->loc_auth_req & SMP_SC_SUPPORT_BIT)) {
        p_cb->le_secure_connections_mode_is_used = TRUE;
    }

    SMP_TRACE_DEBUG("use_sc_process = %d\n", p_cb->le_secure_connections_mode_is_used);

    if (p_cb->le_secure_connections_mode_is_used) {
        model = smp_select_association_model_secure_connections(p_cb);
    } else {
        model = smp_select_legacy_association_model(p_cb);
    }
    return model;
}

/*******************************************************************************
** Function         smp_select_legacy_association_model
**
** Description      This function is called to select association mode if at least
**                  one side doesn't support secure connections.
**
*******************************************************************************/
tSMP_ASSO_MODEL smp_select_legacy_association_model(tSMP_CB *p_cb)
{
    tSMP_ASSO_MODEL model = SMP_MODEL_OUT_OF_RANGE;

    SMP_TRACE_DEBUG("%s\n", __func__);
    /* if OOB data is present on both devices, then use OOB association model */
    if (p_cb->peer_oob_flag == SMP_OOB_PRESENT && p_cb->loc_oob_flag == SMP_OOB_PRESENT) {
        return SMP_MODEL_OOB;
    }

    /* else if neither device requires MITM, then use Just Works association model */
    if (SMP_NO_MITM_REQUIRED (p_cb->peer_auth_req) && SMP_NO_MITM_REQUIRED(p_cb->loc_auth_req)) {
        return SMP_MODEL_ENCRYPTION_ONLY;
    }

    /* otherwise use IO capability to select association model */
    if (p_cb->peer_io_caps < SMP_IO_CAP_MAX && p_cb->local_io_capability < SMP_IO_CAP_MAX) {
        if (p_cb->role == HCI_ROLE_MASTER) {
            model = smp_association_table[p_cb->role][p_cb->peer_io_caps]
                    [p_cb->local_io_capability];
        } else {
            model = smp_association_table[p_cb->role][p_cb->local_io_capability]
                    [p_cb->peer_io_caps];
        }
    }

    return model;
}

/*******************************************************************************
** Function         smp_select_association_model_secure_connections
**
** Description      This function is called to select association mode if both
**                  sides support secure connections.
**
*******************************************************************************/
tSMP_ASSO_MODEL smp_select_association_model_secure_connections(tSMP_CB *p_cb)
{
    tSMP_ASSO_MODEL model = SMP_MODEL_OUT_OF_RANGE;

    SMP_TRACE_DEBUG("%s\n", __func__);
    /* if OOB data is present on at least one device, then use OOB association model */
    if (p_cb->peer_oob_flag == SMP_OOB_PRESENT || p_cb->loc_oob_flag == SMP_OOB_PRESENT) {
        return SMP_MODEL_SEC_CONN_OOB;
    }

    /* else if neither device requires MITM, then use Just Works association model */
    if (SMP_NO_MITM_REQUIRED (p_cb->peer_auth_req) && SMP_NO_MITM_REQUIRED(p_cb->loc_auth_req)) {
        return SMP_MODEL_SEC_CONN_JUSTWORKS;
    }

    /* otherwise use IO capability to select association model */
    if (p_cb->peer_io_caps < SMP_IO_CAP_MAX && p_cb->local_io_capability < SMP_IO_CAP_MAX) {
        if (p_cb->role == HCI_ROLE_MASTER) {
            model = smp_association_table_sc[p_cb->role][p_cb->peer_io_caps]
                    [p_cb->local_io_capability];
        } else {
            model = smp_association_table_sc[p_cb->role][p_cb->local_io_capability]
                    [p_cb->peer_io_caps];
        }
    }

    return model;
}

/*******************************************************************************
** Function         smp_reverse_array
**
** Description      This function reverses array bytes
**
*******************************************************************************/
void smp_reverse_array(UINT8 *arr, UINT8 len)
{
    UINT8 i = 0, tmp;

    SMP_TRACE_DEBUG("smp_reverse_array\n");

    for (i = 0; i < len / 2; i ++) {
        tmp = arr[i];
        arr[i] = arr[len - 1 - i];
        arr[len - 1 - i] = tmp;
    }
}

/*******************************************************************************
** Function         smp_calculate_random_input
**
** Description      This function returns random input value to be used in commitment
**                  calculation for SC passkey entry association mode
**                  (if bit["round"] in "random" array == 1 then returns 0x81
**                   else returns 0x80).
**
** Returns          ri value
**
*******************************************************************************/
UINT8 smp_calculate_random_input(UINT8 *random, UINT8 round)
{
    UINT8 i = round / 8;
    UINT8 j = round % 8;
    UINT8 ri;

    SMP_TRACE_DEBUG("random: 0x%02x, round: %d, i: %d, j: %d\n", random[i], round, i, j);
    ri = ((random[i] >> j) & 1) | 0x80;
    SMP_TRACE_DEBUG("%s ri=0x%02x\n", __func__, ri);
    return ri;
}

/*******************************************************************************
** Function         smp_collect_local_io_capabilities
**
** Description      This function puts into IOcap array local device
**                  IOCapability, OOB data, AuthReq.
**
** Returns          void
**
*******************************************************************************/
void smp_collect_local_io_capabilities(UINT8 *iocap, tSMP_CB *p_cb)
{
    SMP_TRACE_DEBUG("%s\n", __func__);

    iocap[0] = p_cb->local_io_capability;
    iocap[1] = p_cb->loc_oob_flag;
    iocap[2] = p_cb->loc_auth_req;
}

/*******************************************************************************
** Function         smp_collect_peer_io_capabilities
**
** Description      This function puts into IOcap array peer device
**                  IOCapability, OOB data, AuthReq.
**
** Returns          void
**
*******************************************************************************/
void smp_collect_peer_io_capabilities(UINT8 *iocap, tSMP_CB *p_cb)
{
    SMP_TRACE_DEBUG("%s\n", __func__);

    iocap[0] = p_cb->peer_io_caps;
    iocap[1] = p_cb->peer_oob_flag;
    iocap[2] = p_cb->peer_auth_req;
}
#if (BLE_INCLUDED == TRUE)
/*******************************************************************************
** Function         smp_collect_local_ble_address
**
** Description      This function puts into le_addr array local device le address:
**                  le_addr[0-5] = local BD ADDR,
**                  le_addr[6] = local le address type (PUBLIC/RANDOM).
**
** Returns          void
**
*******************************************************************************/
void smp_collect_local_ble_address(UINT8 *le_addr, tSMP_CB *p_cb)
{
    tBLE_ADDR_TYPE  addr_type = 0;
    BD_ADDR         bda;
    UINT8           *p = le_addr;

    SMP_TRACE_DEBUG("%s\n", __func__);

    BTM_ReadConnectionAddr( p_cb->pairing_bda, bda, &addr_type);
    BDADDR_TO_STREAM(p, bda);
    UINT8_TO_STREAM(p, addr_type);
}

/*******************************************************************************
** Function         smp_collect_peer_ble_address
**
** Description      This function puts into le_addr array peer device le address:
**                  le_addr[0-5] = peer BD ADDR,
**                  le_addr[6] = peer le address type (PUBLIC/RANDOM).
**
** Returns          void
**
*******************************************************************************/
void smp_collect_peer_ble_address(UINT8 *le_addr, tSMP_CB *p_cb)
{
    tBLE_ADDR_TYPE  addr_type = 0;
    BD_ADDR         bda;
    UINT8           *p = le_addr;

    SMP_TRACE_DEBUG("%s\n", __func__);

    if (!BTM_ReadRemoteConnectionAddr(p_cb->pairing_bda, bda, &addr_type)) {
        SMP_TRACE_ERROR("can not collect peer le addr information for unknown device\n");
        return;
    }

    BDADDR_TO_STREAM(p, bda);
    UINT8_TO_STREAM(p, addr_type);
}

/*******************************************************************************
** Function         smp_check_commitment
**
** Description      This function compares peer commitment values:
**                  - expected (i.e. calculated locally),
**                  - received from the peer.
**
** Returns          TRUE  if the values are the same
**                  FALSE otherwise
**
*******************************************************************************/
BOOLEAN smp_check_commitment(tSMP_CB *p_cb)
{
    BT_OCTET16 expected;

    SMP_TRACE_DEBUG("%s\n", __func__);

    smp_calculate_peer_commitment(p_cb, expected);
    print128(expected, (const UINT8 *)"calculated peer commitment");
    print128(p_cb->remote_commitment, (const UINT8 *)"received peer commitment");

    if (memcmp(p_cb->remote_commitment, expected, BT_OCTET16_LEN)) {
        SMP_TRACE_WARNING("Commitment check fails\n");
        return FALSE;
    }

    SMP_TRACE_DEBUG("Commitment check succeeds\n");
    return TRUE;
}

/*******************************************************************************
**
** Function         smp_save_secure_connections_long_term_key
**
** Description      The function saves SC LTK as BLE key for future use as local
**                  and/or peer key.
**
** Returns          void
**
*******************************************************************************/
void smp_save_secure_connections_long_term_key(tSMP_CB *p_cb)
{
    tBTM_LE_LENC_KEYS   lle_key;
    tBTM_LE_PENC_KEYS   ple_key;

    SMP_TRACE_DEBUG("%s-Save LTK as local LTK key\n", __func__);
    memcpy(lle_key.ltk, p_cb->ltk, BT_OCTET16_LEN);
    lle_key.div = 0;
    lle_key.key_size = p_cb->loc_enc_size;
    lle_key.sec_level = p_cb->sec_level;
    btm_sec_save_le_key(p_cb->pairing_bda, BTM_LE_KEY_LENC, (tBTM_LE_KEY_VALUE *)&lle_key, TRUE);

    SMP_TRACE_DEBUG("%s-Save LTK as peer LTK key\n", __func__);
    ple_key.ediv = 0;
    memset(ple_key.rand, 0, BT_OCTET8_LEN);
    memcpy(ple_key.ltk, p_cb->ltk, BT_OCTET16_LEN);
    ple_key.sec_level = p_cb->sec_level;
    ple_key.key_size  = p_cb->loc_enc_size;
    btm_sec_save_le_key(p_cb->pairing_bda, BTM_LE_KEY_PENC, (tBTM_LE_KEY_VALUE *)&ple_key, TRUE);
}

/*******************************************************************************
**
** Function         smp_calculate_f5_mackey_and_long_term_key
**
** Description      The function calculates MacKey and LTK and saves them in CB.
**                  To calculate MacKey and LTK it calls smp_calc_f5(...).
**                  MacKey is used in dhkey calculation, LTK is used to encrypt
**                  the link.
**
** Returns          FALSE if out of resources, TRUE otherwise.
**
*******************************************************************************/
BOOLEAN smp_calculate_f5_mackey_and_long_term_key(tSMP_CB *p_cb)
{
    UINT8 a[7];
    UINT8 b[7];
    UINT8 *p_na;
    UINT8 *p_nb;

    SMP_TRACE_DEBUG("%s\n", __func__);

    if (p_cb->role == HCI_ROLE_MASTER) {
        smp_collect_local_ble_address(a, p_cb);
        smp_collect_peer_ble_address(b, p_cb);
        p_na = p_cb->rand;
        p_nb = p_cb->rrand;
    } else {
        smp_collect_local_ble_address(b, p_cb);
        smp_collect_peer_ble_address(a, p_cb);
        p_na = p_cb->rrand;
        p_nb = p_cb->rand;
    }

    if (!smp_calculate_f5(p_cb->dhkey, p_na, p_nb, a, b, p_cb->mac_key, p_cb->ltk)) {
        SMP_TRACE_ERROR("%s failed\n", __func__);
        return FALSE;
    }

    SMP_TRACE_EVENT ("%s is completed\n", __func__);
    return TRUE;
}
#endif  ///BLE_INCLUDED == TRUE
/*******************************************************************************
**
** Function         smp_request_oob_data
**
** Description      Requests application to provide OOB data.
**
** Returns          TRUE - OOB data has to be provided by application
**                  FALSE - otherwise (unexpected)
**
*******************************************************************************/
BOOLEAN smp_request_oob_data(tSMP_CB *p_cb)
{
    tSMP_OOB_DATA_TYPE req_oob_type = SMP_OOB_INVALID_TYPE;

    SMP_TRACE_DEBUG("%s\n", __func__);

    if (p_cb->peer_oob_flag == SMP_OOB_PRESENT && p_cb->loc_oob_flag == SMP_OOB_PRESENT) {
        /* both local and peer rcvd data OOB */
        req_oob_type = SMP_OOB_BOTH;
    } else if (p_cb->peer_oob_flag == SMP_OOB_PRESENT) {
        /* peer rcvd OOB local data, local didn't receive OOB peer data */
        req_oob_type = SMP_OOB_LOCAL;
    } else if (p_cb->loc_oob_flag == SMP_OOB_PRESENT) {
        req_oob_type = SMP_OOB_PEER;
    }

    SMP_TRACE_DEBUG("req_oob_type = %d\n", req_oob_type);

    if (req_oob_type == SMP_OOB_INVALID_TYPE) {
        return FALSE;
    }

    p_cb->req_oob_type = req_oob_type;
    p_cb->cb_evt = SMP_SC_OOB_REQ_EVT;
    smp_sm_event(p_cb, SMP_TK_REQ_EVT, &req_oob_type);

    return TRUE;
}


#endif