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/******************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 *
 *
 * 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.
 *
 ******************************************************************/

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#include "iotivity_config.h"
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#define _GNU_SOURCE

#include <stddef.h>
#include <stdbool.h>
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#include <assert.h>
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#include "ca_adapter_net_ssl.h"
#include "cacommon.h"
#include "caipinterface.h"
#include "oic_malloc.h"
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#include "ocrandom.h"
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#include "byte_array.h"
#include "octhread.h"
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#include "timer.h"
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// headers required for mbed TLS
#include "mbedtls/platform.h"
#include "mbedtls/ssl.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/pkcs12.h"
#include "mbedtls/ssl_internal.h"
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#include "mbedtls/net_sockets.h"
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#include "mbedtls/oid.h"
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#ifdef __WITH_DTLS__
#include "mbedtls/timing.h"
#include "mbedtls/ssl_cookie.h"
#endif

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#if !defined(NDEBUG) || defined(TB_LOG)
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#include "mbedtls/debug.h"
#include "mbedtls/version.h"
#endif

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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
#ifdef HAVE_UNISTD_H
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#include <unistd.h>
#endif


/**
 * @def MBED_TLS_VERSION_LEN
 * @brief mbedTLS version string length
 */
#define MBED_TLS_VERSION_LEN (16)
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 /**
 * @def PERSONALIZATION_STRING
 * @brief Personalization string for the mbedtls RNG
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 */
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#define PERSONALIZATION_STRING "IOTIVITY_RND"
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/**
 * @def USERID_PREFIX
 * @brief userid prefix in certificate alternative subject name field
 */
#define USERID_PREFIX "userid:"

/**
 * @def NET_SSL_TAG
 * @brief Logging tag for module name
 */
#define NET_SSL_TAG "OIC_CA_NET_SSL"
/**
 * @def MBED_TLS_TAG
 * @brief Logging tag for mbedTLS library
 */
#define MBED_TLS_TAG "MBED_TLS"
/**
 * @def MMBED_TLS_DEBUG_LEVEL
 * @brief Logging level for mbedTLS library
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 * Level 1 logs errors only, level 4 is verbose logging.
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 */
#define MBED_TLS_DEBUG_LEVEL (4)

/**
 * @def TLS_MSG_BUF_LEN
 * @brief Buffer size for TLS record. A single TLS record may be up to 16384 octets in length
 */

#define TLS_MSG_BUF_LEN (16384)
/**
 * @def PSK_LENGTH
 * @brief PSK keys max length
 */
#define PSK_LENGTH (256/8)
/**
 * @def UUID_LENGTHPSK_LENGTH
 * @brief Identity max length
 */
#define UUID_LENGTH (128/8)
/**
 * @def MASTER_SECRET_LEN
 * @brief TLS master secret length
 */
#define MASTER_SECRET_LEN (48)
/**
 * @def RANDOM_LEN
 * @brief TLS client and server random bytes length
 */
#define RANDOM_LEN (32)
/**
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 * @def SHA384_MAC_KEY_LENGTH
 * @brief MAC key length for SHA384 cipher suites
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 */
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#define SHA384_MAC_KEY_LENGTH (48)
/**
 * @def SHA256_MAC_KEY_LENGTH
 * @brief MAC key length for SHA256 cipher suites
 */
#define SHA256_MAC_KEY_LENGTH (32)
/**
 * @def CCM_MAC_KEY_LENGTH
 * @brief MAC key length for CCM cipher suites
 */
#define CCM_MAC_KEY_LENGTH (0)
/**
 * @def AES256_KEY_LENGTH
 * @brief key material length for AES256 cipher suites
 */
#define AES256_KEY_LENGTH (32)
/**
 * @def AES128_KEY_LENGTH
 * @brief key material length for AES128 cipher suites
 */
#define AES128_KEY_LENGTH (16)
/**
 * @def GCM_IV_LENGTH
 * @brief length of nonce for GCM cipher suites
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 */
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#define GCM_IV_LENGTH (12)
/**
 * @def CCM_IV_LENGTH
 * @brief length of nonce for CCM cipher suites
 */
#define CCM_IV_LENGTH (4)
/**
 * @def CBC_IV_LENGTH
 * @brief length of nonce for CBC cipher suites
 */
#define CBC_IV_LENGTH (0)
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/**
 * @var RETRANSMISSION_TIME
 * @brief Maximum timeout value (in seconds) to start DTLS retransmission.
 */
#define RETRANSMISSION_TIME 1

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/**@def SSL_CLOSE_NOTIFY(peer, ret)
 *
 * Notifies of existing \a peer about closing TLS connection.
 *
 * @param[in] peer remote peer
 * @param[in] ret used internaly
 */
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#define SSL_CLOSE_NOTIFY(peer, ret)                                                                \
do                                                                                                 \
{                                                                                                  \
    (ret) = mbedtls_ssl_close_notify(&(peer)->ssl);                                                \
} while (MBEDTLS_ERR_SSL_WANT_WRITE == (ret))

/**@def SSL_RES(peer, status)
 *
 * Sets SSL result for callback.
 *
 * @param[in] peer remote peer
 */
#define SSL_RES(peer, status)                                                                      \
if (g_sslCallback)                                                                                 \
{                                                                                                  \
    CAErrorInfo_t errorInfo;                                                                       \
    errorInfo.result = (status);                                                                   \
    g_sslCallback(&(peer)->sep.endpoint, &errorInfo);                                              \
}
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/* OCF-defined EKU value indicating an identity certificate, that can be used for
 * TLS client and server authentication.  This is the DER encoding of the OID
 * 1.3.6.1.4.1.44924.1.6.
 */
static const unsigned char EKU_IDENTITY[] = { 0x2B, 0x06, 0x01, 0x04, 0x01, 0x82, 0xDE, 0x7C, 0x01, 0x06 };

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/**@def CONF_SSL(clientConf, serverConf, fn, ...)
 *
 * Calls \a fn for \a clientConf and \a serverConf.
 *
 */
#define CONF_SSL(clientConf, serverConf, fn, ...) do {                                             \
fn((clientConf), __VA_ARGS__);                                                                     \
fn((serverConf), __VA_ARGS__);                                                                     \
} while (0)

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/** @def CHECK_MBEDTLS_RET(f, ...)
 * A macro that checks \a f function return code
 *
 * If function returns error code it goes to error processing.
 *
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 * **IMPORTANT:** Any time CHECK_MBEDTLS_RET is used an `exit:` goto label must
 *                be present to handle error processing.
 *
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 * @param[in] f  Function to call
 */
#define CHECK_MBEDTLS_RET(f, ...) do {                                                             \
int ret = (f)(__VA_ARGS__);                                                                        \
if (0 != ret) {                                                                                    \
    OIC_LOG_V(ERROR, NET_SSL_TAG, "%s returned -0x%04x\n", __func__, -(ret));                      \
    goto exit;                                                                                     \
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} } while (0)
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typedef enum
{
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    SSL_RSA_WITH_AES_256_CBC_SHA256,
    SSL_RSA_WITH_AES_128_GCM_SHA256,
    SSL_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
    SSL_ECDHE_ECDSA_WITH_AES_128_CCM_8,
    SSL_ECDHE_ECDSA_WITH_AES_128_CCM,
    SSL_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
    SSL_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,
    SSL_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
    SSL_ECDHE_PSK_WITH_AES_128_CBC_SHA256,
    SSL_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
    SSL_ECDH_ANON_WITH_AES_128_CBC_SHA256,
    SSL_CIPHER_MAX
} SslCipher_t;
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typedef enum
{
    ADAPTER_CURVE_SECP256R1,
    ADAPTER_CURVE_MAX
} AdapterCurve_t;

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static const int tlsCipher[SSL_CIPHER_MAX][2] =
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{
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    {MBEDTLS_TLS_RSA_WITH_AES_256_CBC_SHA256, 0},
    {MBEDTLS_TLS_RSA_WITH_AES_128_GCM_SHA256, 0},
    {MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, 0},
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    {MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8, 0},
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    {MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CCM, 0},
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    {MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, 0},
    {MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384, 0},
    {MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, 0},
    {MBEDTLS_TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA256, 0},
    {MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, 0},
    {MBEDTLS_TLS_ECDH_ANON_WITH_AES_128_CBC_SHA256, 0}
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};

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static int g_cipherSuitesList[SSL_CIPHER_MAX];
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mbedtls_ecp_group_id curve[ADAPTER_CURVE_MAX][2] =
{
    {MBEDTLS_ECP_DP_SECP256R1, MBEDTLS_ECP_DP_NONE}
};

static PkiInfo_t g_pkiInfo = {{NULL, 0}, {NULL, 0}, {NULL, 0}, {NULL, 0}};

typedef struct  {
    int code;
    int alert;
} CrtVerifyAlert_t;

static const CrtVerifyAlert_t crtVerifyAlerts[] = {
    {MBEDTLS_X509_BADCERT_EXPIRED,       MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED},
    {MBEDTLS_X509_BADCERT_REVOKED,       MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED},
    {MBEDTLS_X509_BADCERT_CN_MISMATCH,   MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN},
    {MBEDTLS_X509_BADCERT_NOT_TRUSTED,   MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA},
    {MBEDTLS_X509_BADCRL_NOT_TRUSTED,    MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA},
    {MBEDTLS_X509_BADCRL_EXPIRED,        MBEDTLS_SSL_ALERT_MSG_INSUFFICIENT_SECURITY},
    {MBEDTLS_X509_BADCERT_MISSING,       MBEDTLS_SSL_ALERT_MSG_NO_CERT},
    {MBEDTLS_X509_BADCERT_SKIP_VERIFY,   MBEDTLS_SSL_ALERT_MSG_INSUFFICIENT_SECURITY},
    {MBEDTLS_X509_BADCERT_OTHER,         MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR},
    {MBEDTLS_X509_BADCERT_FUTURE,        MBEDTLS_SSL_ALERT_MSG_BAD_CERT},
    {MBEDTLS_X509_BADCRL_FUTURE,         MBEDTLS_SSL_ALERT_MSG_INSUFFICIENT_SECURITY},
    {MBEDTLS_X509_BADCERT_KEY_USAGE,     MBEDTLS_SSL_ALERT_MSG_BAD_CERT},
    {MBEDTLS_X509_BADCERT_EXT_KEY_USAGE, MBEDTLS_SSL_ALERT_MSG_BAD_CERT},
    {MBEDTLS_X509_BADCERT_NS_CERT_TYPE,  MBEDTLS_SSL_ALERT_MSG_BAD_CERT},
    {MBEDTLS_X509_BADCERT_BAD_MD,        MBEDTLS_SSL_ALERT_MSG_BAD_CERT},
    {MBEDTLS_X509_BADCERT_BAD_PK,        MBEDTLS_SSL_ALERT_MSG_BAD_CERT},
    {MBEDTLS_X509_BADCERT_BAD_KEY,       MBEDTLS_SSL_ALERT_MSG_BAD_CERT},
    {MBEDTLS_X509_BADCRL_BAD_MD,         MBEDTLS_SSL_ALERT_MSG_BAD_CERT},
    {MBEDTLS_X509_BADCRL_BAD_PK,         MBEDTLS_SSL_ALERT_MSG_BAD_CERT},
    {MBEDTLS_X509_BADCRL_BAD_KEY,        MBEDTLS_SSL_ALERT_MSG_BAD_CERT},
    {0, 0}
};

static int GetAlertCode(uint32_t flags)
{
    const CrtVerifyAlert_t *cur;

    for (cur = crtVerifyAlerts; cur->alert != 0 ; cur++)
    {
        if (flags & cur->code)
        {
            return cur->alert;
        }
    }
    return 0;
}

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#if !defined(NDEBUG) || defined(TB_LOG)
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/**
 * Pass a message to the OIC logger.
 *
 * @param[in] ctx  opaque context for the callback
 * @param[in] level  debug level
 * @param[in] file  file name
 * @param[in] line  line number
 * @param[in] str  message
 */
static void DebugSsl(void *ctx, int level, const char *file, int line, const char *str)
{
    ((void) level);
    ((void) file);
    ((void) line);
    ((void) ctx);

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    char * temp = (char*) str;
    size_t len = strlen(temp);
    if (1 <= len && temp[len - 1] == '\n')
    {
        temp[len - 1] = '\0';
    }

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    OIC_LOG_V(DEBUG, MBED_TLS_TAG, "%s", str);
}
#endif

/**
 * structure to holds the information of cache message and address info.
 */
typedef ByteArray_t SslCacheMessage_t;


/**
 * Data structure for holding the send and recv callbacks.
 */
typedef struct TlsCallBacks
{
    CAPacketReceivedCallback recvCallback;  /**< Callback used to send data to upper layer. */
    CAPacketSendCallback sendCallback;      /**< Callback used to send data to socket layer. */
} SslCallbacks_t;

/**
 * Data structure for holding the mbedTLS interface related info.
 */
typedef struct SslContext
{
    u_arraylist_t *peerList;         /**< peer list which holds the mapping between
                                              peer id, it's n/w address and mbedTLS context. */
    mbedtls_entropy_context entropy;
    mbedtls_ctr_drbg_context rnd;
    mbedtls_x509_crt ca;
    mbedtls_x509_crt crt;
    mbedtls_pk_context pkey;

    mbedtls_ssl_config clientTlsConf;
    mbedtls_ssl_config serverTlsConf;
    mbedtls_ssl_config clientDtlsConf;
    mbedtls_ssl_config serverDtlsConf;
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    SslCipher_t cipher;
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    SslCallbacks_t adapterCallbacks[MAX_SUPPORTED_ADAPTERS];
    mbedtls_x509_crl crl;
    bool cipherFlag[2];
    int selectedCipher;

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#ifdef __WITH_DTLS__
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    mbedtls_ssl_cookie_ctx cookieCtx;
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    int timerId;
#endif

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} SslContext_t;

/**
 * @var g_caSslContext
 * @brief global context which holds tls context and cache list information.
 */
static SslContext_t * g_caSslContext = NULL;

/**
 * @var g_getCredentialsCallback
 * @brief callback to get TLS credentials (same as for DTLS)
 */
static CAgetPskCredentialsHandler g_getCredentialsCallback = NULL;
/**
 * @var g_getCerdentilTypesCallback
 * @brief callback to get different credential types from SRM
 */
static CAgetCredentialTypesHandler g_getCredentialTypesCallback = NULL;
/**
 * @var g_getPkixInfoCallback
 *
 * @brief callback to get X.509-based Public Key Infrastructure
 */
static CAgetPkixInfoHandler g_getPkixInfoCallback = NULL;

/**
 * @var g_dtlsContextMutex
 * @brief Mutex to synchronize access to g_caSslContext.
 */
static oc_mutex g_sslContextMutex = NULL;

/**
 * @var g_sslCallback
 * @brief callback to deliver the TLS handshake result
 */
static CAErrorCallback g_sslCallback = NULL;

/**
 * Data structure for holding the data to be received.
 */
typedef struct SslRecBuf
{
    uint8_t * buff;
    size_t len;
    size_t loaded;
} SslRecBuf_t;
/**
 * Data structure for holding the data related to endpoint
 * and TLS session.
 */
typedef struct SslEndPoint
{
    mbedtls_ssl_context ssl;
    CASecureEndpoint_t sep;
    u_arraylist_t * cacheList;
    SslRecBuf_t recBuf;
    uint8_t master[MASTER_SECRET_LEN];
    uint8_t random[2*RANDOM_LEN];
#ifdef __WITH_DTLS__
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    mbedtls_timing_delay_context timer;
#endif // __WITH_DTLS__
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} SslEndPoint_t;

void CAsetPskCredentialsCallback(CAgetPskCredentialsHandler credCallback)
{
    // TODO Does this method needs protection of tlsContextMutex?
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    g_getCredentialsCallback = credCallback;
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
}

void CAsetPkixInfoCallback(CAgetPkixInfoHandler infoCallback)
{
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    g_getPkixInfoCallback = infoCallback;
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
}
void CAsetCredentialTypesCallback(CAgetCredentialTypesHandler credTypesCallback)
{
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    g_getCredentialTypesCallback = credTypesCallback;
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
}

static int GetAdapterIndex(CATransportAdapter_t adapter)
{
    switch (adapter)
    {
        case CA_ADAPTER_IP:
            return 0;
        case CA_ADAPTER_TCP:
            return 1;
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        case CA_ADAPTER_GATT_BTLE:
            return 2;
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        default:
            OIC_LOG(ERROR, NET_SSL_TAG, "Unsupported adapter");
            return -1;
    }
}
/**
 * Write callback.
 *
 * @param[in]  tep    TLS endpoint
 * @param[in]  data    message
 * @param[in]  dataLen    message length
 *
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 * @return  message length or -1 on error.
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 */
static int SendCallBack(void * tep, const unsigned char * data, size_t dataLen)
{
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
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    VERIFY_NON_NULL_RET(tep, NET_SSL_TAG, "secure endpoint is NULL", -1);
    VERIFY_NON_NULL_RET(data, NET_SSL_TAG, "data is NULL", -1);
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    VERIFY_NON_NULL_RET(g_caSslContext, NET_SSL_TAG, "SSL Context is NULL", -1);
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    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Data len: %" PRIuPTR, dataLen);
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    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Adapter: %u", ((SslEndPoint_t * )tep)->sep.endpoint.adapter);
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    ssize_t sentLen = 0;
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    int adapterIndex = GetAdapterIndex(((SslEndPoint_t * )tep)->sep.endpoint.adapter);
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    if (0 <= adapterIndex && MAX_SUPPORTED_ADAPTERS > adapterIndex)
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    {
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        size_t dataToSend = (dataLen > INT_MAX) ? INT_MAX : dataLen;
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        CAPacketSendCallback sendCallback = g_caSslContext->adapterCallbacks[adapterIndex].sendCallback;
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        sentLen = sendCallback(&(((SslEndPoint_t * )tep)->sep.endpoint), (const void *) data, dataToSend);
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        if (sentLen != dataLen)
        {
            OIC_LOG_V(DEBUG, NET_SSL_TAG,
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                      "Packet was partially sent - sent/total/remained bytes : %d/%" PRIuPTR "/%" PRIuPTR,
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                      sentLen, dataLen, (dataLen - sentLen));
        }
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    }
    else
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "Unsupported adapter");
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        return -1;
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    }

    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
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    return (int)sentLen;
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}
/**
 * Read callback.
 *
 * @param[in]  tep    TLS endpoint
 * @param[in]  data    message
 * @param[in]  dataLen    message length
 *
 * @return  read length
 */
static int RecvCallBack(void * tep, unsigned char * data, size_t dataLen)
{
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    VERIFY_NON_NULL_RET(tep, NET_SSL_TAG, "endpoint is NULL", 0);
    VERIFY_NON_NULL_RET(data, NET_SSL_TAG, "data is NULL", 0);

    SslRecBuf_t *recBuf = &((SslEndPoint_t *)tep)->recBuf;
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    size_t retLen = ((recBuf->len > recBuf->loaded) ? (recBuf->len - recBuf->loaded) : 0);
    retLen = (retLen < dataLen) ? retLen : dataLen;
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    if (retLen > INT_MAX)
    {
        return 0;
    }

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    memcpy(data, recBuf->buff + recBuf->loaded, retLen);
    recBuf->loaded += retLen;

    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
    return (int)retLen;
}

/**
 * Parse chain of X.509 certificates.
 *
 * @param[out] crt     container for X.509 certificates
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 * @param[in]  buf     buffer with X.509 certificates. Certificates must be in a single null-terminated
 *                     string, with each certificate in PEM encoding with headers.
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 * @param[in]  bufLen  buffer length
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 * @param[in]  errNum  number certificates that failed to parse
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 *
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 * @return  number of successfully parsed certificates or -1 on error
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 */
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static int ParseChain(mbedtls_x509_crt * crt, unsigned char * buf, size_t bufLen, int * errNum)
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{
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    int ret;
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    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    VERIFY_NON_NULL_RET(crt, NET_SSL_TAG, "Param crt is NULL" , -1);
    VERIFY_NON_NULL_RET(buf, NET_SSL_TAG, "Param buf is NULL" , -1);

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    if (NULL != errNum)
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    {
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        *errNum = 0;
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    }
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    if ((bufLen >= 2) && (buf[0] == 0x30) && (buf[1] == 0x82))
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    {
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        OIC_LOG_V(ERROR, NET_SSL_TAG, "DER-encoded certificate passed to ParseChain");
        return -1;
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    }
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    ret = mbedtls_x509_crt_parse(crt, buf, bufLen);
    if (0 > ret)
    {
        OIC_LOG_V(ERROR, NET_SSL_TAG, "mbedtls_x509_crt_parse failed: -0x%04x", -(ret));
        return -1;
    }

    if (NULL != errNum)
    {
        *errNum = ret;
    }
    
    ret = 0;
    for (const mbedtls_x509_crt *cur = crt; cur != NULL; cur = cur->next)
    {
        ret++;
    }
    
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
    return ret;
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}

//Loads PKIX related information from SRM
static int InitPKIX(CATransportAdapter_t adapter)
{
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    VERIFY_NON_NULL_RET(g_getPkixInfoCallback, NET_SSL_TAG, "PKIX info callback is NULL", -1);
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    // load pk key, cert, trust chain and crl
    if (g_getPkixInfoCallback)
    {
        g_getPkixInfoCallback(&g_pkiInfo);
    }

    VERIFY_NON_NULL_RET(g_caSslContext, NET_SSL_TAG, "SSL Context is NULL", -1);
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    mbedtls_x509_crt_free(&g_caSslContext->ca);
    mbedtls_x509_crt_free(&g_caSslContext->crt);
    mbedtls_pk_free(&g_caSslContext->pkey);
    mbedtls_x509_crl_free(&g_caSslContext->crl);

    mbedtls_x509_crt_init(&g_caSslContext->ca);
    mbedtls_x509_crt_init(&g_caSslContext->crt);
    mbedtls_pk_init(&g_caSslContext->pkey);
    mbedtls_x509_crl_init(&g_caSslContext->crl);

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    mbedtls_ssl_config * serverConf = (adapter == CA_ADAPTER_IP ||
                                   adapter == CA_ADAPTER_GATT_BTLE ?
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                                   &g_caSslContext->serverDtlsConf : &g_caSslContext->serverTlsConf);
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    mbedtls_ssl_config * clientConf = (adapter == CA_ADAPTER_IP ||
                                   adapter == CA_ADAPTER_GATT_BTLE ?
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                                   &g_caSslContext->clientDtlsConf : &g_caSslContext->clientTlsConf);
    // optional
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    int ret;
    int errNum;
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    int count = ParseChain(&g_caSslContext->crt, g_pkiInfo.crt.data, g_pkiInfo.crt.len, &errNum);
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    if (0 >= count)
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    {
        OIC_LOG(WARNING, NET_SSL_TAG, "Own certificate chain parsing error");
        goto required;
    }
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    if (0 != errNum)
    {
        OIC_LOG_V(WARNING, NET_SSL_TAG, "Own certificate chain parsing error: %d certs failed to parse", errNum);
        goto required;
    }
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    ret =  mbedtls_pk_parse_key(&g_caSslContext->pkey, g_pkiInfo.key.data, g_pkiInfo.key.len,
                                                                               NULL, 0);
    if (0 != ret)
    {
        OIC_LOG(WARNING, NET_SSL_TAG, "Key parsing error");
        goto required;
    }

    ret = mbedtls_ssl_conf_own_cert(serverConf, &g_caSslContext->crt, &g_caSslContext->pkey);
    if (0 != ret)
    {
        OIC_LOG(WARNING, NET_SSL_TAG, "Own certificate parsing error");
        goto required;
    }
    ret = mbedtls_ssl_conf_own_cert(clientConf, &g_caSslContext->crt, &g_caSslContext->pkey);
    if(0 != ret)
    {
        OIC_LOG(WARNING, NET_SSL_TAG, "Own certificate configuration error");
        goto required;
    }

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    /* If we get here, certificates could be used, so configure OCF EKUs. */
    ret = mbedtls_ssl_conf_ekus(serverConf, (const char*)EKU_IDENTITY, sizeof(EKU_IDENTITY),
        (const char*)EKU_IDENTITY, sizeof(EKU_IDENTITY));
    if (0 == ret)
    {
        ret = mbedtls_ssl_conf_ekus(clientConf, (const char*)EKU_IDENTITY, sizeof(EKU_IDENTITY),
            (const char*)EKU_IDENTITY, sizeof(EKU_IDENTITY));
    }
    if (0 != ret)
    {
        /* Cert-based ciphersuites will fail, but if PSK ciphersuites are in
         * the list they might work, so don't return error.
         */
        OIC_LOG(WARNING, NET_SSL_TAG, "EKU configuration error");
    }

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    required:
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    count = ParseChain(&g_caSslContext->ca, g_pkiInfo.ca.data, g_pkiInfo.ca.len, &errNum);
    if(0 >= count)
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    {
        OIC_LOG(ERROR, NET_SSL_TAG, "CA chain parsing error");
        OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
        return -1;
    }
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    if(0 != errNum)
    {
        OIC_LOG_V(WARNING, NET_SSL_TAG, "CA chain parsing warning: %d certs failed to parse", errNum);
    }
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    ret = mbedtls_x509_crl_parse_der(&g_caSslContext->crl, g_pkiInfo.crl.data, g_pkiInfo.crl.len);
    if(0 != ret)
    {
        OIC_LOG(WARNING, NET_SSL_TAG, "CRL parsing error");
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        CONF_SSL(clientConf, serverConf, mbedtls_ssl_conf_ca_chain, &g_caSslContext->ca, NULL);
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    }
    else
    {
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        CONF_SSL(clientConf, serverConf, mbedtls_ssl_conf_ca_chain,
                 &g_caSslContext->ca, &g_caSslContext->crl);
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    }

    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
    return 0;
}

/*
 * PSK callback.
 *
 * @param[in]  notUsed     opaque context
 * @param[in]  ssl    mbedTLS context
 * @param[in]  desc    identity
 * @param[in]  descLen    identity length
 *
 * @return  0 on success any other return value will result in a denied PSK identity
 */
static int GetPskCredentialsCallback(void * notUsed, mbedtls_ssl_context * ssl,
                                     const unsigned char * desc, size_t descLen)
{
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    VERIFY_NON_NULL_RET(g_getCredentialsCallback, NET_SSL_TAG, "Credential callback s NULL", -1);
    VERIFY_NON_NULL_RET(ssl, NET_SSL_TAG, "ssl pointer is NULL", -1);
    VERIFY_NON_NULL_RET(desc, NET_SSL_TAG, "desc pointer is NULL", -1);
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    VERIFY_TRUE_RET((descLen <= CA_MAX_ENDPOINT_IDENTITY_LEN), NET_SSL_TAG,
                    "desc too long!", -1);

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    (void) notUsed;
    uint8_t keyBuf[PSK_LENGTH] = {0};

    // Retrieve the credentials blob from security module
    int ret = g_getCredentialsCallback(CA_DTLS_PSK_KEY, desc, descLen, keyBuf, PSK_LENGTH);
    if (ret > 0)
    {
        memcpy(((SslEndPoint_t *) ssl)->sep.identity.id, desc, descLen);
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        ((SslEndPoint_t *) ssl)->sep.identity.id_length = (uint16_t)descLen;
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        OIC_LOG(DEBUG, NET_SSL_TAG, "PSK:");
        OIC_LOG_BUFFER(DEBUG, NET_SSL_TAG, keyBuf, ret);

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        OIC_LOG(DEBUG, NET_SSL_TAG, "Identity:");
        OIC_LOG_BUFFER(DEBUG, NET_SSL_TAG, desc, descLen);

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        OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
        return(mbedtls_ssl_set_hs_psk(ssl, keyBuf, ret));
    }
    OIC_LOG_V(WARNING, NET_SSL_TAG, "Out %s", __func__);
    return -1;
}
/**
 * Gets session corresponding for endpoint.
 *
 * @param[in]  peer    remote address
 *
 * @return  TLS session or NULL
 */
static SslEndPoint_t *GetSslPeer(const CAEndpoint_t *peer)
{
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    size_t listIndex = 0;
    size_t listLength = 0;
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    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    VERIFY_NON_NULL_RET(peer, NET_SSL_TAG, "TLS peer is NULL", NULL);
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    VERIFY_NON_NULL_RET(g_caSslContext, NET_SSL_TAG, "SSL Context is NULL", NULL);
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    SslEndPoint_t *tep = NULL;
    listLength = u_arraylist_length(g_caSslContext->peerList);
    for (listIndex = 0; listIndex < listLength; listIndex++)
    {
        tep = (SslEndPoint_t *) u_arraylist_get(g_caSslContext->peerList, listIndex);
        if (NULL == tep)
        {
            continue;
        }
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        OIC_LOG_V(DEBUG, NET_SSL_TAG, "Compare [%s:%d] and [%s:%d] for %d adapter",
                  peer->addr, peer->port, tep->sep.endpoint.addr, tep->sep.endpoint.port,
                  peer->adapter);

        if((peer->adapter == tep->sep.endpoint.adapter)
                && (0 == strncmp(peer->addr, tep->sep.endpoint.addr, MAX_ADDR_STR_SIZE_CA))
                && (peer->port == tep->sep.endpoint.port || CA_ADAPTER_GATT_BTLE == peer->adapter))
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        {
            OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
            return tep;
        }
    }
    OIC_LOG(DEBUG, NET_SSL_TAG, "Return NULL");
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
    return NULL;
}
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/**
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 * Gets a copy of CA secure endpoint info corresponding for endpoint.
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 *
 * @param[in]  peer    remote address
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 * @param[out] sep     copy of secure endpoint data
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 *
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 * @return  CA_STATUS_OK on success; other error code on failure
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 */
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CAResult_t GetCASecureEndpointData(const CAEndpoint_t* peer, CASecureEndpoint_t* sep)
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{
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);

    oc_mutex_lock(g_sslContextMutex);
    if (NULL == g_caSslContext)
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "Context is NULL");
        oc_mutex_unlock(g_sslContextMutex);
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        return CA_STATUS_NOT_INITIALIZED;
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    }

    SslEndPoint_t* sslPeer = GetSslPeer(peer);
    if(sslPeer)
    {
        OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
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        memcpy(sep, &sslPeer->sep, sizeof(sslPeer->sep));
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        oc_mutex_unlock(g_sslContextMutex);
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        return CA_STATUS_OK;
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    }

    OIC_LOG(DEBUG, NET_SSL_TAG, "Return NULL");
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
    oc_mutex_unlock(g_sslContextMutex);
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    return CA_STATUS_INVALID_PARAM;
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}

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/**
 * Adds a bit to the attributes field of a secure endpoint.
 *
 * @param[in]  peer         remote address
 * @param[in]  newAttribute bit to be added to the attributes field
 *
 * @return  true if the secure endpoint has been found, false otherwise.
 */
bool SetCASecureEndpointAttribute(const CAEndpoint_t* peer, uint32_t newAttribute)
{
    bool result = false;

    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s(peer = %s:%u, attribute = %#x)", __func__,
        peer->addr, (uint32_t)peer->port, newAttribute);

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    // Acquiring g_sslContextMutex recursively here is not supported, so assert
    // that the caller already owns this mutex. IOT-1876 tracks a possible
    // refactoring of the code that is using g_sslContextMutex, to address these
    // API quirks.
    oc_mutex_assert_owner(g_sslContextMutex, true);
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    if (NULL == g_caSslContext)
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "Context is NULL");
    }
    else
    {
        SslEndPoint_t* sslPeer = GetSslPeer(peer);

        if (!sslPeer)
        {
            OIC_LOG(ERROR, NET_SSL_TAG, "SSL peer not found");
        }
        else
        {
            sslPeer->sep.attributes |= newAttribute;
            result = true;
        }
    }

    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s -> %s", __func__, result ? "success" : "failed");
    return result;
}

/**
 * Gets the attributes field of a secure endpoint.
 *
 * @param[in]  peer          remote address
 * @param[out] allAttributes all the attributes bits for that remote address
 *
 * @return  true if the secure endpoint has been found, false otherwise.
 */
bool GetCASecureEndpointAttributes(const CAEndpoint_t* peer, uint32_t* allAttributes)
{
    bool result = false;

    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s(peer = %s:%u)", __func__,
        peer->addr, (uint32_t)peer->port);

    oc_mutex_lock(g_sslContextMutex);

    if (NULL == g_caSslContext)
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "Context is NULL");
    }
    else
    {
        SslEndPoint_t* sslPeer = GetSslPeer(peer);

        if (!sslPeer)
        {
            OIC_LOG(ERROR, NET_SSL_TAG, "SSL peer not found");
        }
        else
        {
            *allAttributes = sslPeer->sep.attributes;
            result = true;
        }
    }

    oc_mutex_unlock(g_sslContextMutex);

    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s -> %s, attributes = %#x", __func__,
        result ? "success" : "failed", result ? *allAttributes : 0);
    return result;
}

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/**
 * Deletes cached message.
 *
 * @param[in]  msg    message
 */
static void DeleteCacheMessage(SslCacheMessage_t * msg)
{
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    VERIFY_NON_NULL_VOID(msg, NET_SSL_TAG, "msg");

    OICFree(msg->data);
    OICFree(msg);

    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
}
/**
 * Deletes cached message list.
 *
 * @param[in] cacheList  list of cached messages
 */
static void DeleteCacheList(u_arraylist_t * cacheList)
{
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    VERIFY_NON_NULL_VOID(cacheList, NET_SSL_TAG, "cacheList");
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    size_t listIndex = 0;
    size_t listLength = 0;
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    listLength = u_arraylist_length(cacheList);
    for (listIndex = 0; listIndex < listLength; listIndex++)
    {
        SslCacheMessage_t * msg = (SslCacheMessage_t *) u_arraylist_get(cacheList, listIndex);
        if (NULL != msg)
        {
            DeleteCacheMessage(msg);
        }
    }
    u_arraylist_free(&cacheList);

    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
}
/**
 * Deletes endpoint with session.
 *
 * @param[in]  tep    endpoint with session info
 */
static void DeleteSslEndPoint(SslEndPoint_t * tep)
{
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    VERIFY_NON_NULL_VOID(tep, NET_SSL_TAG, "tep");

    mbedtls_ssl_free(&tep->ssl);
    DeleteCacheList(tep->cacheList);
    OICFree(tep);
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
}
/**
 * Removes endpoint session from list.
 *
 * @param[in]  endpoint    remote address
 */
static void RemovePeerFromList(CAEndpoint_t * endpoint)
{
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    VERIFY_NON_NULL_VOID(g_caSslContext, NET_SSL_TAG, "SSL Context is NULL");
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    VERIFY_NON_NULL_VOID(endpoint, NET_SSL_TAG, "endpoint");
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    size_t listLength = u_arraylist_length(g_caSslContext->peerList);
    for (size_t listIndex = 0; listIndex < listLength; listIndex++)
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    {
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        SslEndPoint_t * tep = (SslEndPoint_t *)u_arraylist_get(g_caSslContext->peerList, listIndex);
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        if (NULL == tep)
        {
            continue;
        }
        if(0 == strncmp(endpoint->addr, tep->sep.endpoint.addr, MAX_ADDR_STR_SIZE_CA)
                && (endpoint->port == tep->sep.endpoint.port))
        {
            u_arraylist_remove(g_caSslContext->peerList, listIndex);
            DeleteSslEndPoint(tep);
            return;
        }
    }
}
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 /**
  * Checks handshake result. Removes peer from list and sends alert
  * if handshake failed.
  *
  * @param[in] peer Remote peer's endpoint.
  * @param[in] ret  Error code.
  * @param[in] str  Debug string.
  * @param[in] msg  Alert message.
  *
  * @return - "true" if the SSL handshake was successful.
  *         - "false" otherwise.
  */
static bool checkSslOperation(SslEndPoint_t*  peer,
                              int ret,
                              const char* str,
                              unsigned char msg)
{
    if ((0 != ret) &&
        (MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY != ret) &&
        (MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED != ret) &&
        (MBEDTLS_ERR_SSL_WANT_READ != ret) &&
        (MBEDTLS_ERR_SSL_WANT_WRITE != ret) &&
        (MBEDTLS_ERR_SSL_NON_FATAL != ret) &&
        (MBEDTLS_SSL_ALERT_MSG_USER_CANCELED != ret) &&
        (MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION != ret) &&
        (MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_EXT != ret) &&
        (MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY != ret) &&
        (MBEDTLS_SSL_ALERT_MSG_NO_CERT != ret) &&
        (MBEDTLS_SSL_ALERT_MSG_BAD_CERT != ret) &&
        (MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT != ret) &&
        (MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED != ret) &&
        (MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED != ret) &&
        (MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN != ret) &&
        (MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK != ret) &&
        (MBEDTLS_SSL_ALERT_MSG_UNRECOGNIZED_NAME != ret) &&
        (MBEDTLS_SSL_ALERT_MSG_UNKNOWN_PSK_IDENTITY != ret) &&
        (MBEDTLS_SSL_ALERT_MSG_NO_APPLICATION_PROTOCOL != ret))
    {
        OIC_LOG_V(ERROR, NET_SSL_TAG, "%s: -0x%x", (str), -ret);
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        (void)msg;
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        if (MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO != ret)
        {
            SSL_RES((peer), CA_DTLS_AUTHENTICATION_FAILURE);
        }

        RemovePeerFromList(&(peer)->sep.endpoint);
        return false;
    }

    return true;
}

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/**
 * Deletes session list.
 */
static void DeletePeerList()
{
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    VERIFY_NON_NULL_VOID(g_caSslContext, NET_SSL_TAG, "SSL Context is NULL");

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    size_t listLength = u_arraylist_length(g_caSslContext->peerList);
    for (size_t listIndex = 0; listIndex < listLength; listIndex++)
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    {
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        SslEndPoint_t * tep = (SslEndPoint_t *)u_arraylist_get(g_caSslContext->peerList, listIndex);
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        if (NULL == tep)
        {
            continue;
        }
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        if (MBEDTLS_SSL_HANDSHAKE_OVER == tep->ssl.state)
        {
            int ret = 0;
            do
            {
                ret = mbedtls_ssl_close_notify(&tep->ssl);
            }
            while (MBEDTLS_ERR_SSL_WANT_WRITE == ret);
        }
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        DeleteSslEndPoint(tep);
    }
    u_arraylist_free(&g_caSslContext->peerList);
}

CAResult_t CAcloseSslConnection(const CAEndpoint_t *endpoint)
{
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    VERIFY_NON_NULL_RET(endpoint, NET_SSL_TAG, "Param endpoint is NULL" , CA_STATUS_INVALID_PARAM);

    oc_mutex_lock(g_sslContextMutex);
    if (NULL == g_caSslContext)
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "Context is NULL");
        oc_mutex_unlock(g_sslContextMutex);
        return CA_STATUS_FAILED;
    }
    SslEndPoint_t * tep = GetSslPeer(endpoint);
    if (NULL == tep)
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "Session does not exist");
        oc_mutex_unlock(g_sslContextMutex);
        return CA_STATUS_FAILED;
    }
    /* No error checking, the connection might be closed already */
    int ret = 0;
    do
    {
        ret = mbedtls_ssl_close_notify(&tep->ssl);
    }
    while (MBEDTLS_ERR_SSL_WANT_WRITE == ret);

    RemovePeerFromList(&tep->sep.endpoint);
    oc_mutex_unlock(g_sslContextMutex);

    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
    return CA_STATUS_OK;
}
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void CAcloseSslConnectionAll(CATransportAdapter_t transportType)
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{
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    oc_mutex_lock(g_sslContextMutex);
    if (NULL == g_caSslContext)
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "Context is NULL");
        oc_mutex_unlock(g_sslContextMutex);
        return;
    }

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    size_t listLength = u_arraylist_length(g_caSslContext->peerList);
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    OIC_LOG_V(DEBUG, NET_SSL_TAG,
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            "Required transport [%d], peer count [%" PRIuPTR "]", transportType, listLength);
    for (size_t i = listLength; i > 0; i--)
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    {
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        SslEndPoint_t *tep = (SslEndPoint_t *)u_arraylist_get(g_caSslContext->peerList, i - 1);
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        if (NULL == tep)
        {
            continue;
        }
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        OIC_LOG_V(DEBUG, NET_SSL_TAG, "SSL Connection [%s:%d], Transport [%d]",
                  tep->sep.endpoint.addr, tep->sep.endpoint.port, tep->sep.endpoint.adapter);

        // check transport matching
        if (0 == (tep->sep.endpoint.adapter & transportType))
        {
            OIC_LOG(DEBUG, NET_SSL_TAG, "Skip the un-matched transport session");
            continue;
        }
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        // TODO: need to check below code after socket close is ensured.
        /*int ret = 0;
        do
        {
            ret = mbedtls_ssl_close_notify(&tep->ssl);
        }
        while (MBEDTLS_ERR_SSL_WANT_WRITE == ret);*/

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        // delete from list
        u_arraylist_remove(g_caSslContext->peerList, i - 1);
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        DeleteSslEndPoint(tep);
    }
    oc_mutex_unlock(g_sslContextMutex);

    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
    return;
}
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/**
 * Creates session for endpoint.
 *
 * @param[in]  endpoint    remote address
 * @param[in]  config    mbedTLS configuration info
 *
 * @return  TLS endpoint or NULL
 */
static SslEndPoint_t * NewSslEndPoint(const CAEndpoint_t * endpoint, mbedtls_ssl_config * config)
{
    SslEndPoint_t * tep = NULL;
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    VERIFY_NON_NULL_RET(endpoint, NET_SSL_TAG, "endpoint", NULL);
    VERIFY_NON_NULL_RET(config, NET_SSL_TAG, "config", NULL);
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    VERIFY_NON_NULL_RET(g_caSslContext, NET_SSL_TAG, "SSL Context is NULL", NULL);
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    tep = (SslEndPoint_t *) OICCalloc(1, sizeof (SslEndPoint_t));
    if (NULL == tep)
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "Malloc failed!");
        return NULL;
    }

    tep->sep.endpoint = *endpoint;
    tep->sep.endpoint.flags = (CATransportFlags_t)(tep->sep.endpoint.flags | CA_SECURE);

    if(0 != mbedtls_ssl_setup(&tep->ssl, config))
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "Setup failed");
        OICFree(tep);
        OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
        return NULL;
    }

    mbedtls_ssl_set_bio(&tep->ssl, tep, SendCallBack, RecvCallBack, NULL);
    if (MBEDTLS_SSL_TRANSPORT_DATAGRAM == config->transport)
    {
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        mbedtls_ssl_set_timer_cb(&tep->ssl, &tep->timer,
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                                  mbedtls_timing_set_delay, mbedtls_timing_get_delay);
        if (MBEDTLS_SSL_IS_SERVER == config->endpoint)
        {
            if (0 != mbedtls_ssl_set_client_transport_id(&tep->ssl,
                                    (const unsigned char *) endpoint->addr, sizeof(endpoint->addr)))
            {
                OIC_LOG(ERROR, NET_SSL_TAG, "Transport id setup failed!");
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                mbedtls_ssl_free(&tep->ssl);
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                OICFree(tep);
                OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
                return NULL;
            }
        }
    }
    tep->cacheList = u_arraylist_create();
    if (NULL == tep->cacheList)
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "cacheList initialization failed!");
        mbedtls_ssl_free(&tep->ssl);
        OICFree(tep);
        OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
        return NULL;
    }
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    OIC_LOG_V(DEBUG, NET_SSL_TAG, "New [%s role] endpoint added [%s:%d]",
            (MBEDTLS_SSL_IS_SERVER==config->endpoint ? "server" : "client"),
            endpoint->addr, endpoint->port);
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    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
    return tep;
}
/**
 * Initializes PSK identity.
 *
 * @param[out]  config    client/server config to be updated
 *
 * @return  0 on success or -1 on error
 */
static int InitPskIdentity(mbedtls_ssl_config * config)
{
    uint8_t idBuf[UUID_LENGTH] = {0};
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    VERIFY_NON_NULL_RET(config, NET_SSL_TAG, "Param config is NULL" , -1);

    if (0 > g_getCredentialsCallback(CA_DTLS_PSK_IDENTITY, NULL, 0, idBuf, UUID_LENGTH))
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "Identity not found");
        OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
        return -1;
    }
    if (0 != mbedtls_ssl_conf_psk(config, idBuf, 0, idBuf, UUID_LENGTH))
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "Identity initialization failed!");
        OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
        return -1;
    }
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
    return 0;
}
static void SetupCipher(mbedtls_ssl_config * config, CATransportAdapter_t adapter)
{
    int index = 0;
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
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    VERIFY_NON_NULL_VOID(config, NET_SSL_TAG, "Invaild param");
    VERIFY_NON_NULL_VOID(g_caSslContext, NET_SSL_TAG, "SSL Context is NULL");
    VERIFY_NON_NULL_VOID(g_getCredentialTypesCallback, NET_SSL_TAG, "Param callback is null");
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    //Resetting cipherFlag
    g_caSslContext->cipherFlag[0] = false;
    g_caSslContext->cipherFlag[1] = false;

    if (NULL == g_getCredentialTypesCallback)
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "Param callback is null");
        return;
    }

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    g_getCredentialTypesCallback(g_caSslContext->cipherFlag);
    // Retrieve the PSK credential from SRM
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    if (true == g_caSslContext->cipherFlag[0] && 0 != InitPskIdentity(config))
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    {
        OIC_LOG(ERROR, NET_SSL_TAG, "PSK identity initialization failed!");
    }

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    // Retrieve the Cert credential from SRM
    if (true == g_caSslContext->cipherFlag[1])
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    {
        int ret = InitPKIX(adapter);
        if (0 != ret)
        {
            OIC_LOG(ERROR, NET_SSL_TAG, "Failed to init X.509");
        }
    }

    memset(g_cipherSuitesList, 0, sizeof(g_cipherSuitesList));
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    // Add the preferred ciphersuite first
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    if (SSL_CIPHER_MAX != g_caSslContext->cipher)
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    {
        g_cipherSuitesList[index] = tlsCipher[g_caSslContext->cipher][0];
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        OIC_LOG_V(DEBUG, NET_SSL_TAG, "Preferred ciphersuite added");
        index++;
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    }
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    // Add PSK ciphersuite
    if (true == g_caSslContext->cipherFlag[0] &&
                MBEDTLS_TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA256 != tlsCipher[g_caSslContext->cipher][0])
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    {
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       g_cipherSuitesList[index] = MBEDTLS_TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA256;
       OIC_LOG(DEBUG, NET_SSL_TAG, "PSK ciphersuite added");
       index++;
    }

    // Add all certificate ciphersuites
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    if (true == g_caSslContext->cipherFlag[1])
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    {
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        for (int i = 0; i < SSL_CIPHER_MAX - 1; i++)
        {
            if (MBEDTLS_TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA256 != tlsCipher[i][0] &&
                    i != g_caSslContext->cipher)
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            {
                g_cipherSuitesList[index] = tlsCipher[i][0];
                index ++;
            }
        }
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    }

    OIC_LOG(DEBUG, NET_SSL_TAG, "Supported ciphersuites:");
    for (int i = 0; i < index; i++)
    {
        OIC_LOG_V(DEBUG, NET_SSL_TAG, "Ciphersuite %04x", g_cipherSuitesList[i]);
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    }

    mbedtls_ssl_conf_ciphersuites(config, g_cipherSuitesList);

    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
}
/**
 * Initiate TLS handshake with endpoint.
 *
 * @param[in]  endpoint    remote address
 *
 * @return  TLS endpoint or NULL
 */
static SslEndPoint_t * InitiateTlsHandshake(const CAEndpoint_t *endpoint)
{
    int ret = 0;
    SslEndPoint_t * tep = NULL;

    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    VERIFY_NON_NULL_RET(endpoint, NET_SSL_TAG, "Param endpoint is NULL" , NULL);
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    VERIFY_NON_NULL_RET(g_caSslContext, NET_SSL_TAG, "SSL Context is NULL", NULL);
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    mbedtls_ssl_config * config = (endpoint->adapter == CA_ADAPTER_IP ||
                                   endpoint->adapter == CA_ADAPTER_GATT_BTLE ?
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                                   &g_caSslContext->clientDtlsConf : &g_caSslContext->clientTlsConf);
    tep = NewSslEndPoint(endpoint, config);
    if (NULL == tep)
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "Malloc failed!");
        return NULL;
    }

    //Load allowed SVR suites from SVR DB
    SetupCipher(config, endpoint->adapter);

    ret = u_arraylist_add(g_caSslContext->peerList, (void *) tep);
    if (!ret)
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "u_arraylist_add failed!");
        DeleteSslEndPoint(tep);
        return NULL;
    }

    while (MBEDTLS_SSL_HANDSHAKE_OVER > tep->ssl.state)
    {
        ret = mbedtls_ssl_handshake_step(&tep->ssl);
        if (MBEDTLS_ERR_SSL_CONN_EOF == ret)
        {
            break;
        }
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        else if (-1 == ret)
        {
            OIC_LOG(ERROR, NET_SSL_TAG, "Handshake failed due to socket error");
            RemovePeerFromList(&tep->sep.endpoint);
            return NULL;
        }
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        if (!checkSslOperation(tep,
                               ret,
                               "Handshake error",
                               MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE))
        {
            OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
            DeleteSslEndPoint(tep);
            return NULL;
        }
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    }
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s", __func__);
    return tep;
}
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#ifdef __WITH_DTLS__
/**
 * Stops DTLS retransmission.
 */
static void StopRetransmit()
{
    if (g_caSslContext)
    {
        unregisterTimer(g_caSslContext->timerId);
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        g_caSslContext->timerId= -1;
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    }
}
#endif
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void CAdeinitSslAdapter()
{
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);

    VERIFY_NON_NULL_VOID(g_caSslContext, NET_SSL_TAG, "context is NULL");
    VERIFY_NON_NULL_VOID(g_sslContextMutex, NET_SSL_TAG, "context mutex is NULL");

    //Lock tlsContext mutex
    oc_mutex_lock(g_sslContextMutex);

    // Clear all lists
    DeletePeerList();

    // De-initialize mbedTLS
    mbedtls_x509_crt_free(&g_caSslContext->crt);
    mbedtls_pk_free(&g_caSslContext->pkey);
#ifdef __WITH_TLS__
    mbedtls_ssl_config_free(&g_caSslContext->clientTlsConf);
    mbedtls_ssl_config_free(&g_caSslContext->serverTlsConf);
#endif // __WITH_TLS__
#ifdef __WITH_DTLS__
    mbedtls_ssl_config_free(&g_caSslContext->clientDtlsConf);
    mbedtls_ssl_config_free(&g_caSslContext->serverDtlsConf);
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    mbedtls_ssl_cookie_free(&g_caSslContext->cookieCtx);
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#endif // __WITH_DTLS__
    mbedtls_ctr_drbg_free(&g_caSslContext->rnd);
    mbedtls_entropy_free(&g_caSslContext->entropy);
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#ifdef __WITH_DTLS__
    StopRetransmit();
#endif
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    // De-initialize tls Context
    OICFree(g_caSslContext);
    g_caSslContext = NULL;

    // Unlock tlsContext mutex and de-initialize it
    oc_mutex_unlock(g_sslContextMutex);
    oc_mutex_free(g_sslContextMutex);
    g_sslContextMutex = NULL;

    OIC_LOG_V(DEBUG, NET_SSL_TAG, "Out %s ", __func__);
}

static int InitConfig(mbedtls_ssl_config * conf, int transport, int mode)
{
    OIC_LOG_V(DEBUG, NET_SSL_TAG, "In %s", __func__);
    VERIFY_NON_NULL_RET(conf, NET_SSL_TAG, "Param conf is NULL" , -1);
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    VERIFY_NON_NULL_RET(g_caSslContext, NET_SSL_TAG, "SSL Context is NULL", -1);
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    mbedtls_ssl_config_init(conf);
    if (mbedtls_ssl_config_defaults(conf, mode, transport, MBEDTLS_SSL_PRESET_DEFAULT) != 0)
    {
        OIC_LOG(ERROR, NET_SSL_TAG, "Config initialization failed!");
        return -1;
    }

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    /*
     * Configure mbedTLS runtime options. Many options are configured at build
     * time, see extlibs/mbedtls/config-iotivity.h
     */
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    mbedtls_ssl_conf_psk_cb(conf, GetPskCredentialsCallback, NULL);
    mbedtls_ssl_conf_rng(conf, mbedtls_ctr_drbg_random, &g_caSslContext->rnd);
    mbedtls_ssl_conf_curves(conf, curve[ADAPTER_CURVE_SECP256R1]);
    mbedtls_ssl_conf_authmode(conf, MBEDTLS_SSL_VERIFY_REQUIRED);

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#ifdef __WITH_DTLS__
    if (MBEDTLS_SSL_TRANSPORT_DATAGRAM == transport &&
            MBEDTLS_SSL_IS_SERVER == mode)
    {
        mbedtls_ssl_conf_dtls_cookies(conf, mbedtls_ssl_cookie_write, mbedtls_ssl_cookie_check,
                                      &g_caSslContext->cookieCtx);
    }