credresource.c 76.5 KB
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//******************************************************************
//
// Copyright 2015 Intel Mobile Communications GmbH 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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#define __STDC_LIMIT_MACROS
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#include <stdlib.h>
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
#ifdef HAVE_STRINGS_H
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#include <strings.h>
#endif
#include <stdint.h>

#include "cainterface.h"
#include "payload_logging.h"
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#include "ocstack.h"
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#include "ocrandom.h"
#include "base64.h"
#include "ocserverrequest.h"
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#include "oic_malloc.h"
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#include "ocpayload.h"
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#include "utlist.h"
#include "credresource.h"
#include "doxmresource.h"
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#include "pstatresource.h"
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#include "iotvticalendar.h"
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#include "pbkdf2.h"
#include "resourcemanager.h"
#include "srmresourcestrings.h"
#include "srmutility.h"
#include "psinterface.h"
#include "pinoxmcommon.h"
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#ifdef __WITH_DTLS__
#include "global.h"
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#endif
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#define TAG  "SRM-CREDL"

/** Default cbor payload size. This value is increased in case of CborErrorOutOfMemory.
 * The value of payload size is increased until reaching belox max cbor size. */
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static const uint16_t CBOR_SIZE = 2048;
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/** Max cbor size payload. */
static const uint16_t CBOR_MAX_SIZE = 4400;
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/** CRED size - Number of mandatory items. */
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static const uint8_t CRED_ROOT_MAP_SIZE = 4;
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static const uint8_t CRED_MAP_SIZE = 3;

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static OicSecCred_t        *gCred = NULL;
static OCResourceHandle    gCredHandle = NULL;

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/**
 * This function frees OicSecCred_t object's fields and object itself.
 */
static void FreeCred(OicSecCred_t *cred)
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{
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    if(NULL == cred)
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    {
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        OIC_LOG(ERROR, TAG, "Invalid Parameter");
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        return;
    }
    //Note: Need further clarification on roleID data type
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#if 0
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    //Clean roleIds
    OICFree(cred->roleIds);
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#endif

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    //Clean PublicData/OptionalData/Credusage
#if defined(__WITH_X509__) || defined(__WITH_TLS__)
     // TODO: Need to check credUsage.
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    OICFree(cred->publicData.data);
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    OICFree(cred->optionalData.data);
    OICFree(cred->credUsage);

#endif /* __WITH_X509__ ||  __WITH_TLS__*/
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    //Clean PrivateData
    OICFree(cred->privateData.data);
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    //Clean Period
    OICFree(cred->period);
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    //Clean Cred node itself
    OICFree(cred);
}
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void DeleteCredList(OicSecCred_t* cred)
{
    if (cred)
    {
        OicSecCred_t *credTmp1 = NULL, *credTmp2 = NULL;
        LL_FOREACH_SAFE(cred, credTmp1, credTmp2)
        {
            LL_DELETE(cred, credTmp1);
            FreeCred(credTmp1);
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        }
    }
}

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static size_t OicSecCredCount(const OicSecCred_t *secCred)
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{
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    size_t size = 0;
    for (const OicSecCred_t *cred = secCred; cred; cred = cred->next)
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    {
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        size++;
    }
    return size;
}
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OCStackResult CredToCBORPayload(const OicSecCred_t *credS, uint8_t **cborPayload,
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                                size_t *cborSize, int secureFlag)
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{
    if (NULL == credS || NULL == cborPayload || NULL != *cborPayload || NULL == cborSize)
    {
        return OC_STACK_INVALID_PARAM;
    }
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    OCStackResult ret = OC_STACK_ERROR;
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    CborError cborEncoderResult = CborNoError;
    uint8_t *outPayload = NULL;
    size_t cborLen = *cborSize;
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    *cborSize = 0;
    *cborPayload = NULL;
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    const OicSecCred_t *cred = credS;
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    CborEncoder encoder;
    CborEncoder credArray;
    CborEncoder credRootMap;
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    if (0 == cborLen)
    {
        cborLen = CBOR_SIZE;
    }

    outPayload = (uint8_t *)OICCalloc(1, cborLen);
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    VERIFY_NON_NULL(TAG, outPayload, ERROR);
    cbor_encoder_init(&encoder, outPayload, cborLen, 0);
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    // Create CRED Root Map (creds, rownerid)
    cborEncoderResult = cbor_encoder_create_map(&encoder, &credRootMap, CRED_ROOT_MAP_SIZE);
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Cred Root Map");

    // creds
    cborEncoderResult = cbor_encode_text_string(&credRootMap, OIC_JSON_CREDS_NAME,
        strlen(OIC_JSON_CREDS_NAME));
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding creds Name Tag.");

    // creds array
    cborEncoderResult = cbor_encoder_create_array(&credRootMap, &credArray, OicSecCredCount(cred));
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Cred Array.");
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    while (cred)
    {
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        CborEncoder credMap;
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        size_t mapSize = CRED_MAP_SIZE;
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        size_t inLen = 0;
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        if (cred->period)
        {
            mapSize++;
        }
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#if defined(__WITH_X509__) || defined(__WITH_TLS__)
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        if (SIGNED_ASYMMETRIC_KEY == cred->credType && cred->publicData.data)
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        {
            mapSize++;
        }
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        if (SIGNED_ASYMMETRIC_KEY == cred->credType && cred->optionalData.data)
        {
            mapSize++;
        }
        if (cred->credUsage)
        {
            mapSize++;
        }
#endif /* __WITH_X509__ ||  __WITH_TLS__*/
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        if (!secureFlag && cred->privateData.data)
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        {
            mapSize++;
        }
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        cborEncoderResult = cbor_encoder_create_map(&credArray, &credMap, mapSize);
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        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Cred Map");

        //CredID -- Mandatory
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        cborEncoderResult = cbor_encode_text_string(&credMap, OIC_JSON_CREDID_NAME,
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            strlen(OIC_JSON_CREDID_NAME));
        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Cred Id Tag. ");
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        cborEncoderResult = cbor_encode_int(&credMap, cred->credId);
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        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Cred Id Value.");

        //Subject -- Mandatory
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        cborEncoderResult = cbor_encode_text_string(&credMap, OIC_JSON_SUBJECTID_NAME,
            strlen(OIC_JSON_SUBJECTID_NAME));
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        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Subject Tag.");
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        inLen = (memcmp(&(cred->subject), &WILDCARD_SUBJECT_ID, WILDCARD_SUBJECT_ID_LEN) == 0) ?
            WILDCARD_SUBJECT_ID_LEN : sizeof(OicUuid_t);
        if(inLen == WILDCARD_SUBJECT_ID_LEN)
        {
            cborEncoderResult = cbor_encode_text_string(&credMap, WILDCARD_RESOURCE_URI,
                strlen(WILDCARD_RESOURCE_URI));
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Addding Subject Id wildcard Value.");
        }
        else
        {
            char *subject = NULL;
            ret = ConvertUuidToStr(&cred->subject, &subject);
            VERIFY_SUCCESS(TAG, ret == OC_STACK_OK, ERROR);
            cborEncoderResult = cbor_encode_text_string(&credMap, subject, strlen(subject));
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Addding Subject Id Value.");
            OICFree(subject);
        }
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        //CredType -- Mandatory
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        cborEncoderResult = cbor_encode_text_string(&credMap, OIC_JSON_CREDTYPE_NAME,
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            strlen(OIC_JSON_CREDTYPE_NAME));
        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Cred Type Tag.");
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        cborEncoderResult = cbor_encode_int(&credMap, cred->credType);
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        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Cred Type Value.");
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#if defined(__WITH_X509__) || defined(__WITH_TLS__)
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        //PublicData -- Not Mandatory
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        if (SIGNED_ASYMMETRIC_KEY == cred->credType && cred->publicData.data)
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        {
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            CborEncoder publicMap;
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            const size_t publicMapSize = 2;

            cborEncoderResult = cbor_encode_text_string(&credMap, OIC_JSON_PUBLICDATA_NAME,
                strlen(OIC_JSON_PUBLICDATA_NAME));
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding PublicData Tag.");

            cborEncoderResult = cbor_encoder_create_map(&credMap, &publicMap, publicMapSize);
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding PublicData Map");

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            cborEncoderResult = cbor_encode_text_string(&publicMap, OIC_JSON_DATA_NAME,
                strlen(OIC_JSON_DATA_NAME));
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            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Pub Data Tag.");
            cborEncoderResult = cbor_encode_byte_string(&publicMap, cred->publicData.data,
                cred->publicData.len);
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Pub Value.");

            // TODO: Need to data strucure modification for OicSecCert_t.
            cborEncoderResult = cbor_encode_text_string(&publicMap, OIC_JSON_ENCODING_NAME,
                strlen(OIC_JSON_ENCODING_NAME));
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Public Encoding Tag.");
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            cborEncoderResult = cbor_encode_text_string(&publicMap, OIC_SEC_ENCODING_RAW,
                strlen(OIC_SEC_ENCODING_RAW));
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            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Public Encoding Value.");

            cborEncoderResult = cbor_encoder_close_container(&credMap, &publicMap);
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Closing PublicData Map.");
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        }
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        //OptionalData -- Not Mandatory
        if (SIGNED_ASYMMETRIC_KEY == cred->credType && cred->optionalData.data)
        {
            CborEncoder optionalMap;
            const size_t optionalMapSize = 2;

            cborEncoderResult = cbor_encode_text_string(&credMap, OIC_JSON_OPTDATA_NAME,
                strlen(OIC_JSON_OPTDATA_NAME));
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding OptionalData Tag.");

            cborEncoderResult = cbor_encoder_create_map(&credMap, &optionalMap, optionalMapSize);
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding OptionalData Map");

            // TODO: Need to data strucure modification for OicSecCert_t.
            if(OIC_ENCODING_RAW == cred->optionalData.encoding)
            {
                cborEncoderResult = cbor_encode_text_string(&optionalMap, OIC_JSON_ENCODING_NAME,
                    strlen(OIC_JSON_ENCODING_NAME));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Encoding Tag.");
                cborEncoderResult = cbor_encode_text_string(&optionalMap, OIC_SEC_ENCODING_RAW,
                    strlen(OIC_SEC_ENCODING_RAW));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Encoding Value.");

                cborEncoderResult = cbor_encode_text_string(&optionalMap, OIC_JSON_DATA_NAME,
                    strlen(OIC_JSON_DATA_NAME));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Tag.");
                cborEncoderResult = cbor_encode_byte_string(&optionalMap, cred->optionalData.data,
                    cred->optionalData.len);
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Value.");
            }
            else if(OIC_ENCODING_BASE64 == cred->optionalData.encoding)
            {
                cborEncoderResult = cbor_encode_text_string(&optionalMap, OIC_JSON_ENCODING_NAME,
                    strlen(OIC_JSON_ENCODING_NAME));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Encoding Tag.");
                cborEncoderResult = cbor_encode_text_string(&optionalMap, OIC_SEC_ENCODING_BASE64,
                    strlen(OIC_SEC_ENCODING_BASE64));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Encoding Value.");

                cborEncoderResult = cbor_encode_text_string(&optionalMap, OIC_JSON_DATA_NAME,
                    strlen(OIC_JSON_DATA_NAME));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Tag.");
                cborEncoderResult = cbor_encode_text_string(&optionalMap, (char*)(cred->optionalData.data),
                    cred->optionalData.len);
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Value.");
            }
            else if(OIC_ENCODING_PEM == cred->optionalData.encoding)
            {
                cborEncoderResult = cbor_encode_text_string(&optionalMap, OIC_JSON_ENCODING_NAME,
                    strlen(OIC_JSON_ENCODING_NAME));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Encoding Tag.");
                cborEncoderResult = cbor_encode_text_string(&optionalMap, OIC_SEC_ENCODING_PEM,
                    strlen(OIC_SEC_ENCODING_PEM));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Encoding Value.");

                cborEncoderResult = cbor_encode_text_string(&optionalMap, OIC_JSON_DATA_NAME,
                    strlen(OIC_JSON_DATA_NAME));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Tag.");
                cborEncoderResult = cbor_encode_text_string(&optionalMap, (char*)(cred->optionalData.data),
                    cred->optionalData.len);
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Value.");
            }
            else if(OIC_ENCODING_DER == cred->optionalData.encoding)
            {
                cborEncoderResult = cbor_encode_text_string(&optionalMap, OIC_JSON_ENCODING_NAME,
                    strlen(OIC_JSON_ENCODING_NAME));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Encoding Tag.");
                cborEncoderResult = cbor_encode_text_string(&optionalMap, OIC_SEC_ENCODING_DER,
                    strlen(OIC_SEC_ENCODING_DER));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Encoding Value.");

                cborEncoderResult = cbor_encode_text_string(&optionalMap, OIC_JSON_DATA_NAME,
                    strlen(OIC_JSON_DATA_NAME));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Tag.");
                cborEncoderResult = cbor_encode_byte_string(&optionalMap, cred->optionalData.data,
                    cred->optionalData.len);
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional Value.");
            }
            else
            {
                OIC_LOG(ERROR, TAG, "Unknow encoding type for optional data.");
                VERIFY_CBOR_SUCCESS(TAG, CborErrorUnknownType, "Failed Adding optional Encoding Value.");
            }

            cborEncoderResult = cbor_encoder_close_container(&credMap, &optionalMap);
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Closing OptionalData Map.");
        }
        //CredUsage -- Not Mandatory
        if(cred->credUsage)
        {
            cborEncoderResult = cbor_encode_text_string(&credMap, OIC_JSON_CREDUSAGE_NAME,
                strlen(OIC_JSON_CREDUSAGE_NAME));
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Credusage Name Tag.");
            cborEncoderResult = cbor_encode_text_string(&credMap, cred->credUsage,
                strlen(cred->credUsage));
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Credusage Name Value.");
        }
#endif /* __WITH_X509__ ||  __WITH_TLS__*/
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        //PrivateData -- Not Mandatory
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        if(!secureFlag && cred->privateData.data)
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        {
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            CborEncoder privateMap;
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            const size_t privateMapSize = 2;

            cborEncoderResult = cbor_encode_text_string(&credMap, OIC_JSON_PRIVATEDATA_NAME,
                strlen(OIC_JSON_PRIVATEDATA_NAME));
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding PrivateData Tag.");

            cborEncoderResult = cbor_encoder_create_map(&credMap, &privateMap, privateMapSize);
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding PrivateData Map");

            // TODO: Need to data strucure modification for OicSecKey_t.
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            // TODO: Added as workaround, will be replaced soon.
            if(OIC_ENCODING_RAW == cred->privateData.encoding)
            {
                cborEncoderResult = cbor_encode_text_string(&privateMap, OIC_JSON_ENCODING_NAME,
                    strlen(OIC_JSON_ENCODING_NAME));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Private Encoding Tag.");
                cborEncoderResult = cbor_encode_text_string(&privateMap, OIC_SEC_ENCODING_RAW,
                    strlen(OIC_SEC_ENCODING_RAW));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Private Encoding Value.");

                cborEncoderResult = cbor_encode_text_string(&privateMap, OIC_JSON_DATA_NAME,
                    strlen(OIC_JSON_DATA_NAME));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Priv Tag.");
                cborEncoderResult = cbor_encode_byte_string(&privateMap, cred->privateData.data,
                    cred->privateData.len);
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Priv Value.");
            }
            else if(OIC_ENCODING_BASE64 == cred->privateData.encoding)
            {
                cborEncoderResult = cbor_encode_text_string(&privateMap, OIC_JSON_ENCODING_NAME,
                    strlen(OIC_JSON_ENCODING_NAME));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Private Encoding Tag.");
                cborEncoderResult = cbor_encode_text_string(&privateMap, OIC_SEC_ENCODING_BASE64,
                    strlen(OIC_SEC_ENCODING_BASE64));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Private Encoding Value.");

                cborEncoderResult = cbor_encode_text_string(&privateMap, OIC_JSON_DATA_NAME,
                    strlen(OIC_JSON_DATA_NAME));
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Priv Tag.");
                cborEncoderResult = cbor_encode_text_string(&privateMap, (char*)(cred->privateData.data),
                    cred->privateData.len);
                VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Priv Value.");
            }
            else
            {
                OIC_LOG(ERROR, TAG, "Unknow encoding type for private data.");
                VERIFY_CBOR_SUCCESS(TAG, CborErrorUnknownType, "Failed Adding Private Encoding Value.");
            }
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            cborEncoderResult = cbor_encoder_close_container(&credMap, &privateMap);
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Closing PrivateData Map.");
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        }
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        //Period -- Not Mandatory
        if(cred->period)
        {
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            cborEncoderResult = cbor_encode_text_string(&credMap, OIC_JSON_PERIOD_NAME,
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                strlen(OIC_JSON_PERIOD_NAME));
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Period Name Tag.");
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            cborEncoderResult = cbor_encode_text_string(&credMap, cred->period,
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                strlen(cred->period));
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Period Name Value.");
        }
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        cborEncoderResult = cbor_encoder_close_container(&credArray, &credMap);
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        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Closing Cred Map.");
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        cred = cred->next;
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    }
    cborEncoderResult = cbor_encoder_close_container(&credRootMap, &credArray);
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Closing Cred Array.");

    cred = credS;
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    // Rownerid
    {
        char *rowner = NULL;
        cborEncoderResult = cbor_encode_text_string(&credRootMap, OIC_JSON_ROWNERID_NAME,
            strlen(OIC_JSON_ROWNERID_NAME));
        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding rownerid Name.");
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        ret = ConvertUuidToStr(&cred->rownerID, &rowner);
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        VERIFY_SUCCESS(TAG, ret == OC_STACK_OK, ERROR);
        cborEncoderResult = cbor_encode_text_string(&credRootMap, rowner, strlen(rowner));
        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Addding rownerid Value.");
        OICFree(rowner);
    }

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    //RT -- Mandatory
    CborEncoder rtArray;
    cborEncoderResult = cbor_encode_text_string(&credRootMap, OIC_JSON_RT_NAME,
            strlen(OIC_JSON_RT_NAME));
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Addding RT Name Tag.");
    cborEncoderResult = cbor_encoder_create_array(&credRootMap, &rtArray, 1);
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Addding RT Value.");
    for (size_t i = 0; i < 1; i++)
    {
        cborEncoderResult = cbor_encode_text_string(&rtArray, OIC_RSRC_TYPE_SEC_CRED,
                strlen(OIC_RSRC_TYPE_SEC_CRED));
        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding RT Value.");
    }
    cborEncoderResult = cbor_encoder_close_container(&credRootMap, &rtArray);
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Closing RT.");

    //IF-- Mandatory
    CborEncoder ifArray;
    cborEncoderResult = cbor_encode_text_string(&credRootMap, OIC_JSON_IF_NAME,
             strlen(OIC_JSON_IF_NAME));
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Addding IF Name Tag.");
    cborEncoderResult = cbor_encoder_create_array(&credRootMap, &ifArray, 1);
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Addding IF Value.");
    for (size_t i = 0; i < 1; i++)
    {
        cborEncoderResult = cbor_encode_text_string(&ifArray, OC_RSRVD_INTERFACE_DEFAULT,
                strlen(OC_RSRVD_INTERFACE_DEFAULT));
        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding IF Value.");
    }
    cborEncoderResult = cbor_encoder_close_container(&credRootMap, &ifArray);
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Closing IF.");


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    // Close CRED Root Map
    cborEncoderResult = cbor_encoder_close_container(&encoder, &credRootMap);
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Closing CRED Root Map.");

    if (CborNoError == cborEncoderResult)
    {
        OIC_LOG(DEBUG, TAG, "CredToCBORPayload Successed");
        *cborPayload = outPayload;
        *cborSize = encoder.ptr - outPayload;
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        ret = OC_STACK_OK;
    }
    OIC_LOG(DEBUG, TAG, "CredToCBORPayload OUT");
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exit:
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    if (CborErrorOutOfMemory == cborEncoderResult)
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    {
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        OIC_LOG(DEBUG, TAG, "CredToCBORPayload:CborErrorOutOfMemory : retry with more memory");
        // reallocate and try again!
        OICFree(outPayload);
        // Since the allocated initial memory failed, double the memory.
        cborLen += encoder.ptr - encoder.end;
        cborEncoderResult = CborNoError;
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        ret = CredToCBORPayload(credS, cborPayload, &cborLen, secureFlag);
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        *cborSize = cborLen;
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    }
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    if (CborNoError != cborEncoderResult)
    {
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        OIC_LOG(ERROR, TAG, "Failed to CredToCBORPayload");
        OICFree(outPayload);
        outPayload = NULL;
        *cborSize = 0;
        *cborPayload = NULL;
        ret = OC_STACK_ERROR;
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    }

    return ret;
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}

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OCStackResult CBORPayloadToCred(const uint8_t *cborPayload, size_t size,
                                OicSecCred_t **secCred)
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{
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    if (NULL == cborPayload || NULL == secCred || NULL != *secCred || 0 == size)
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    {
        return OC_STACK_INVALID_PARAM;
    }
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    OCStackResult ret = OC_STACK_ERROR;
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    CborValue credCbor = { .parser = NULL };
    CborParser parser = { .end = NULL };
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    CborError cborFindResult = CborNoError;
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    cbor_parser_init(cborPayload, size, 0, &parser, &credCbor);
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    OicSecCred_t *headCred = (OicSecCred_t *) OICCalloc(1, sizeof(OicSecCred_t));
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    // Enter CRED Root Map
    CborValue CredRootMap = { .parser = NULL, .ptr = NULL, .remaining = 0, .extra = 0, .type = 0, .flags = 0 };
    cborFindResult = cbor_value_enter_container(&credCbor, &CredRootMap);
    VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Entering CRED Root Map.");
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    while (cbor_value_is_valid(&CredRootMap))
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    {
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        char* tagName = NULL;
        size_t len = 0;
        CborType type = cbor_value_get_type(&CredRootMap);
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        if (type == CborTextStringType && cbor_value_is_text_string(&CredRootMap))
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        {
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            cborFindResult = cbor_value_dup_text_string(&CredRootMap, &tagName, &len, NULL);
            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding Name in CRED Root Map.");
            cborFindResult = cbor_value_advance(&CredRootMap);
            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Advancing Value in CRED Root Map.");
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        }
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        if(tagName)
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        {
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            if (strcmp(tagName, OIC_JSON_CREDS_NAME)  == 0)
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            {
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                // Enter CREDS Array
                size_t len = 0;
                int credCount = 0;
                CborValue credArray = { .parser = NULL, .ptr = NULL, .remaining = 0, .extra = 0, .type = 0, .flags = 0 };
                cborFindResult = cbor_value_enter_container(&CredRootMap, &credArray);
                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding Cred Array.");

                while (cbor_value_is_valid(&credArray))
                {
                    credCount++;
                    //CredId -- Mandatory
                    CborValue credMap = { .parser = NULL, .ptr = NULL, .remaining = 0, .extra = 0, .type = 0, .flags = 0 };
                    cborFindResult = cbor_value_enter_container(&credArray, &credMap);
                    VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding Cred Map.");
                    OicSecCred_t *cred = NULL;

                    if(1 == credCount)
                    {
                        cred = headCred;
                    }
                    else
                    {
                        cred = (OicSecCred_t *) OICCalloc(1, sizeof(OicSecCred_t));
                        OicSecCred_t *temp = headCred;
                        while (temp->next)
                        {
                            temp = temp->next;
                        }
                        temp->next = cred;
                    }

                    VERIFY_NON_NULL(TAG, cred, ERROR);

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                    while(cbor_value_is_valid(&credMap) && cbor_value_is_text_string(&credMap))
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                    {
                        char* name = NULL;
                        CborType type = cbor_value_get_type(&credMap);
                        if (type == CborTextStringType)
                        {
                            cborFindResult = cbor_value_dup_text_string(&credMap, &name, &len, NULL);
                            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding Name in CRED Map.");
                            cborFindResult = cbor_value_advance(&credMap);
                            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Advancing Value in CRED Map.");
                        }
                        if(name)
                        {
                            //credid
                            if (strcmp(name, OIC_JSON_CREDID_NAME)  == 0)
                            {
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                                uint64_t credId = 0;
                                cborFindResult = cbor_value_get_uint64(&credMap, &credId);
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                                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding CredId.");
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                                cred->credId = (uint16_t)credId;
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                            }
                            // subjectid
                            if (strcmp(name, OIC_JSON_SUBJECTID_NAME)  == 0)
                            {
                                char *subjectid = NULL;
                                cborFindResult = cbor_value_dup_text_string(&credMap, &subjectid, &len, NULL);
                                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding subjectid Value.");
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                                if(strcmp(subjectid, WILDCARD_RESOURCE_URI) == 0)
                                {
                                    cred->subject.id[0] = '*';
                                }
                                else
                                {
                                    ret = ConvertStrToUuid(subjectid, &cred->subject);
                                    VERIFY_SUCCESS(TAG, ret == OC_STACK_OK, ERROR);
                                }
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                                OICFree(subjectid);
                            }
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                            // credtype
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                            if (strcmp(name, OIC_JSON_CREDTYPE_NAME)  == 0)
                            {
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                                uint64_t credType = 0;
                                cborFindResult = cbor_value_get_uint64(&credMap, &credType);
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                                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding CredType.");
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                                cred->credType = (OicSecCredType_t)credType;
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                            }
                            // privatedata
                            if (strcmp(name, OIC_JSON_PRIVATEDATA_NAME)  == 0)
                            {
                                CborValue privateMap = { .parser = NULL };
                                cborFindResult = cbor_value_enter_container(&credMap, &privateMap);

                                while (cbor_value_is_valid(&privateMap))
                                {
                                    char* privname = NULL;
                                    CborType type = cbor_value_get_type(&privateMap);
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                                    if (type == CborTextStringType && cbor_value_is_text_string(&privateMap))
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                                    {
                                        cborFindResult = cbor_value_dup_text_string(&privateMap, &privname,
                                                &len, NULL);
                                        VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed to get text");
                                        cborFindResult = cbor_value_advance(&privateMap);
                                        VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed to advance value");
                                    }
                                    if (privname)
                                    {
                                        // PrivateData::privdata -- Mandatory
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                                        if (strcmp(privname, OIC_JSON_DATA_NAME) == 0)
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                                        {
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                                            if(cbor_value_is_byte_string(&privateMap))
                                            {
                                                cborFindResult = cbor_value_dup_byte_string(&privateMap, &cred->privateData.data,
                                                    &cred->privateData.len, NULL);
                                            }
                                            else if(cbor_value_is_text_string(&privateMap))
                                            {
                                                cborFindResult = cbor_value_dup_text_string(&privateMap, (char**)(&cred->privateData.data),
                                                    &cred->privateData.len, NULL);
                                            }
                                            else
                                            {
                                                cborFindResult = CborErrorUnknownType;
                                                OIC_LOG(ERROR, TAG, "Unknow type for private data.");
                                            }
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                                            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding PrivateData.");
                                        }
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                                        // PrivateData::encoding -- Mandatory
                                        if (strcmp(privname, OIC_JSON_ENCODING_NAME) == 0)
                                        {
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                                            // TODO: Added as workaround. Will be replaced soon.
                                            char* strEncoding = NULL;
                                            cborFindResult = cbor_value_dup_text_string(&privateMap, &strEncoding, &len, NULL);
                                            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding EncodingType");

                                            if(strcmp(strEncoding, OIC_SEC_ENCODING_RAW) == 0)
                                            {
                                                cred->privateData.encoding = OIC_ENCODING_RAW;
                                            }
                                            else if(strcmp(strEncoding, OIC_SEC_ENCODING_BASE64) == 0)
                                            {
                                                cred->privateData.encoding = OIC_ENCODING_BASE64;
                                            }
                                            else
                                            {
                                                //For unit test
                                                cred->privateData.encoding = OIC_ENCODING_RAW;
                                                OIC_LOG(WARNING, TAG, "Unknow encoding type dectected for private data.");
                                            }

                                            OICFree(strEncoding);
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                                        }
                                    }
                                    if (cbor_value_is_valid(&privateMap))
                                    {
                                        cborFindResult = cbor_value_advance(&privateMap);
                                        VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Advancing privatedata Map.");
                                    }
                                    OICFree(privname);
                                }

                            }
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#if defined(__WITH_X509__) || defined(__WITH_TLS__)
                            //PublicData -- Not Mandatory
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                            if (strcmp(name, OIC_JSON_PUBLICDATA_NAME)  == 0)
                            {
                                CborValue pubMap = { .parser = NULL };
                                cborFindResult = cbor_value_enter_container(&credMap, &pubMap);

                                while (cbor_value_is_valid(&pubMap))
                                {
                                    char* pubname = NULL;
                                    CborType type = cbor_value_get_type(&pubMap);
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                                    if (type == CborTextStringType && cbor_value_is_text_string(&pubMap))
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                                    {
                                        cborFindResult = cbor_value_dup_text_string(&pubMap, &pubname,
                                                &len, NULL);
                                        VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed to get text");
                                        cborFindResult = cbor_value_advance(&pubMap);
                                        VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed to advance value");
                                    }
                                    if (pubname)
                                    {
                                        // PrivateData::privdata -- Mandatory
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                                        if (strcmp(pubname, OIC_JSON_DATA_NAME) == 0 && cbor_value_is_byte_string(&pubMap))
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                                        {
                                            cborFindResult = cbor_value_dup_byte_string(&pubMap, &cred->publicData.data,
                                                &cred->publicData.len, NULL);
                                            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding PubData.");
                                        }
                                        // PublicData::encoding -- Mandatory
                                        if (strcmp(pubname, OIC_JSON_ENCODING_NAME) == 0)
                                        {
                                            // TODO: Need to update data structure, just ignore encoding value now.
                                        }
                                    }
                                    if (cbor_value_is_valid(&pubMap))
                                    {
                                        cborFindResult = cbor_value_advance(&pubMap);
                                        VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Advancing publicdata Map.");
                                    }
                                    OICFree(pubname);
                                }
                            }
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                            //OptionalData -- Not Mandatory
                            if (strcmp(name, OIC_JSON_OPTDATA_NAME)  == 0)
                            {
                                CborValue optMap = { .parser = NULL };
                                cborFindResult = cbor_value_enter_container(&credMap, &optMap);

                                while (cbor_value_is_valid(&optMap))
                                {
                                    char* optname = NULL;
                                    CborType type = cbor_value_get_type(&optMap);
                                    if (type == CborTextStringType && cbor_value_is_text_string(&optMap))
                                    {
                                        cborFindResult = cbor_value_dup_text_string(&optMap, &optname,
                                                &len, NULL);
                                        VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed to get text");
                                        cborFindResult = cbor_value_advance(&optMap);
                                        VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed to advance value");
                                    }
                                    if (optname)
                                    {
                                        // OptionalData::optdata -- Mandatory
                                        if (strcmp(optname, OIC_JSON_DATA_NAME) == 0)
                                        {
                                            if(cbor_value_is_byte_string(&optMap))
                                            {
                                                cborFindResult = cbor_value_dup_byte_string(&optMap, &cred->optionalData.data,
                                                    &cred->optionalData.len, NULL);
                                            }
                                            else if(cbor_value_is_text_string(&optMap))
                                            {
                                                cborFindResult = cbor_value_dup_text_string(&optMap, (char**)(&cred->optionalData.data),
                                                    &cred->optionalData.len, NULL);
                                            }
                                            else
                                            {
                                                cborFindResult = CborErrorUnknownType;
                                                OIC_LOG(ERROR, TAG, "Unknow type for optional data.");
                                            }
                                            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding OptionalData.");
                                        }
                                        // OptionalData::encoding -- Mandatory
                                        if (strcmp(optname, OIC_JSON_ENCODING_NAME) == 0)
                                        {
                                            // TODO: Added as workaround. Will be replaced soon.
                                            char* strEncoding = NULL;
                                            cborFindResult = cbor_value_dup_text_string(&optMap, &strEncoding, &len, NULL);
                                            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding EncodingType");

                                            if(strcmp(strEncoding, OIC_SEC_ENCODING_RAW) == 0)
                                            {
                                                OIC_LOG(INFO,TAG,"cbor_value_is_byte_string");
                                                cred->optionalData.encoding = OIC_ENCODING_RAW;
                                            }
                                            else if(strcmp(strEncoding, OIC_SEC_ENCODING_BASE64) == 0)
                                            {
                                                cred->optionalData.encoding = OIC_ENCODING_BASE64;
                                            }
                                            else if(strcmp(strEncoding, OIC_SEC_ENCODING_PEM) == 0)
                                            {
                                                cred->optionalData.encoding = OIC_ENCODING_PEM;
                                            }
                                            else if(strcmp(strEncoding, OIC_SEC_ENCODING_DER) == 0)
                                            {
                                                cred->optionalData.encoding = OIC_ENCODING_DER;
                                            }
                                            else
                                            {
                                                //For unit test
                                                cred->optionalData.encoding = OIC_ENCODING_RAW;
                                                OIC_LOG(WARNING, TAG, "Unknow encoding type dectected for optional data.");
                                            }
                                            OICFree(strEncoding);
                                        }
                                    }
                                    if (cbor_value_is_valid(&optMap))
                                    {
                                        cborFindResult = cbor_value_advance(&optMap);
                                        VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Advancing optdata Map.");
                                    }
                                    OICFree(optname);
                                }
                            }
                            //Credusage -- Not Mandatory
                            if (0 == strcmp(OIC_JSON_CREDUSAGE_NAME, name))
                            {
                                cborFindResult = cbor_value_dup_text_string(&credMap, &cred->credUsage, &len, NULL);
                                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding Period.");
                            }
#endif  //__WITH_X509__ ||  __WITH_TLS__
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                            if (0 == strcmp(OIC_JSON_PERIOD_NAME, name))
                            {
                                cborFindResult = cbor_value_dup_text_string(&credMap, &cred->period, &len, NULL);
                                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding Period.");
                            }

                            if (cbor_value_is_valid(&credMap))
                            {
                                cborFindResult = cbor_value_advance(&credMap);
                                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Advancing CRED Map.");
                            }
                            OICFree(name);
                        }
                    }
                    cred->next = NULL;
                    if (cbor_value_is_valid(&credArray))
                    {
                        cborFindResult = cbor_value_advance(&credArray);
                        VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Advancing CRED Array.");
                    }
                }
            }

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            //ROwner -- Mandatory
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            if (strcmp(tagName, OIC_JSON_ROWNERID_NAME)  == 0 && cbor_value_is_text_string(&CredRootMap))
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            {
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                char *stRowner = NULL;
                cborFindResult = cbor_value_dup_text_string(&CredRootMap, &stRowner, &len, NULL);
                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding Rownerid Value.");
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                ret = ConvertStrToUuid(stRowner, &headCred->rownerID);
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                VERIFY_SUCCESS(TAG, ret == OC_STACK_OK, ERROR);
                OICFree(stRowner);
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            }
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            OICFree(tagName);
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        }
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        if (cbor_value_is_valid(&CredRootMap))
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        {
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            cborFindResult = cbor_value_advance(&CredRootMap);
            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Advancing CRED Root Map.");
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        }
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    }
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    *secCred = headCred;
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    ret = OC_STACK_OK;
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exit:
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    if (CborNoError != cborFindResult)
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    {
        DeleteCredList(headCred);
        headCred = NULL;
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        *secCred = NULL;
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        ret = OC_STACK_ERROR;
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    }
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    return ret;
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}

OicSecCred_t * GenerateCredential(const OicUuid_t * subject, OicSecCredType_t credType,
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                                  const OicSecCert_t * publicData, const OicSecKey_t* privateData,
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                                  const OicUuid_t * rownerID)
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{
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    (void)publicData;
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    OCStackResult ret = OC_STACK_ERROR;

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    OicSecCred_t *cred = (OicSecCred_t *)OICCalloc(1, sizeof(*cred));
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    VERIFY_NON_NULL(TAG, cred, ERROR);

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    //CredId is assigned before appending new cred to the existing
    //credential list and updating svr database in AddCredential().
    cred->credId = 0;
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    VERIFY_NON_NULL(TAG, subject, ERROR);
    memcpy(cred->subject.id, subject->id , sizeof(cred->subject.id));

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    VERIFY_SUCCESS(TAG, credType < (NO_SECURITY_MODE | SYMMETRIC_PAIR_WISE_KEY |
            SYMMETRIC_GROUP_KEY | ASYMMETRIC_KEY | SIGNED_ASYMMETRIC_KEY | PIN_PASSWORD), ERROR);
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    cred->credType = credType;

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#ifdef __WITH_X509__
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    if (publicData && publicData->data)
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    {
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        cred->publicData.data = (uint8_t *)OICCalloc(1, publicData->len);
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        VERIFY_NON_NULL(TAG, cred->publicData.data, ERROR);
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        memcpy(cred->publicData.data, publicData->data, publicData->len);
        cred->publicData.len = publicData->len;
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    }
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#endif // __WITH_X509__
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    if (privateData && privateData->data)
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    {
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        cred->privateData.data = (uint8_t *)OICCalloc(1, privateData->len);
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        VERIFY_NON_NULL(TAG, cred->privateData.data, ERROR);
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        memcpy(cred->privateData.data, privateData->data, privateData->len);
        cred->privateData.len = privateData->len;
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        // TODO: Added as workaround. Will be replaced soon.
        cred->privateData.encoding = OIC_ENCODING_RAW;

#if 0
        // NOTE: Test codes to use base64 for credential.
        uint32_t outSize = 0;
        size_t b64BufSize = B64ENCODE_OUT_SAFESIZE((privateData->len + 1));
        char* b64Buf = (uint8_t *)OICCalloc(1, b64BufSize);
        VERIFY_NON_NULL(TAG, b64Buf, ERROR);
        b64Encode(privateData->data, privateData->len, b64Buf, b64BufSize, &outSize);

        OICFree( cred->privateData.data );
        cred->privateData.data = (uint8_t *)OICCalloc(1, outSize + 1);
        VERIFY_NON_NULL(TAG, cred->privateData.data, ERROR);

        strcpy(cred->privateData.data, b64Buf);
        cred->privateData.encoding = OIC_ENCODING_BASE64;
        cred->privateData.len = outSize;
        OICFree(b64Buf);
#endif //End of Test codes

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    }

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    VERIFY_NON_NULL(TAG, rownerID, ERROR);
    memcpy(&cred->rownerID, rownerID, sizeof(OicUuid_t));
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    ret = OC_STACK_OK;
exit:
    if (OC_STACK_OK != ret)
    {
        DeleteCredList(cred);
        cred = NULL;
    }
    return cred;
}

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static bool UpdatePersistentStorage(const OicSecCred_t *cred)
{
    bool ret = false;

    // Convert Cred data into JSON for update to persistent storage
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    if (cred)
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    {
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        uint8_t *payload = NULL;
        size_t size = 0;
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        int secureFlag = 0;
        OCStackResult res = CredToCBORPayload(cred, &payload, &size, secureFlag);
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        if ((OC_STACK_OK == res) && payload)
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        {
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            if (OC_STACK_OK == UpdateSecureResourceInPS(OIC_JSON_CRED_NAME, payload, size))
            {
                ret = true;
            }
            OICFree(payload);
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        }
    }
    else //Empty cred list
    {
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        if (OC_STACK_OK == UpdateSecureResourceInPS(OIC_JSON_CRED_NAME, NULL, 0))
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        {
            ret = true;
        }
    }
    return ret;
}

/**
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 * Compare function used LL_SORT for sorting credentials.
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 *
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 * @param first pointer to OicSecCred_t struct.
 * @param second  pointer to OicSecCred_t struct.
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 *
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 *@return -1, if credId of first is less than credId of second.
 * 0, if credId of first is equal to credId of second.
 * 1, if credId of first is greater than credId of second.
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 */
static int CmpCredId(const OicSecCred_t * first, const OicSecCred_t *second)
{
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    if (first->credId < second->credId)
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    {
        return -1;
    }
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    else if (first->credId > second->credId)
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    {
        return 1;
    }
    else
        return 0;
}

/**
 * GetCredId goes through the cred list and returns the next
 * available credId. The next credId could be the credId that is
 * available due deletion of OicSecCred_t object or one more than
 * credId of last credential in the list.
 *
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 * @return next available credId if successful, else 0 for error.
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 */
static uint16_t GetCredId()
{
    //Sorts credential list in incremental order of credId
    LL_SORT(gCred, CmpCredId);

    OicSecCred_t *currentCred = NULL, *credTmp = NULL;
    uint16_t nextCredId = 1;

    LL_FOREACH_SAFE(gCred, currentCred, credTmp)
    {
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        if (currentCred->credId == nextCredId)
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        {
            nextCredId += 1;
        }
        else
        {
            break;
        }
    }

    VERIFY_SUCCESS(TAG, nextCredId < UINT16_MAX, ERROR);
    return nextCredId;

exit:
    return 0;
}
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/**
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 * Get the default value.
 *
 * @return  NULL for now.
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 */
static OicSecCred_t* GetCredDefault()
{
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    // TODO:Update it when we finalize the default info.
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    return NULL;
}
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OCStackResult AddCredential(OicSecCred_t * newCred)
{
    OCStackResult ret = OC_STACK_ERROR;
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    VERIFY_SUCCESS(TAG, NULL != newCred, ERROR);

    //Assigning credId to the newCred
    newCred->credId = GetCredId();
    VERIFY_SUCCESS(TAG, newCred->credId != 0, ERROR);
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    //Append the new Cred to existing list
    LL_APPEND(gCred, newCred);
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    if (UpdatePersistentStorage(gCred))
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    {
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        ret = OC_STACK_OK;
    }

exit:
    return ret;
}

OCStackResult RemoveCredential(const OicUuid_t *subject)
{
    OCStackResult ret = OC_STACK_ERROR;
    OicSecCred_t *cred = NULL;
    OicSecCred_t *tempCred = NULL;
    bool deleteFlag = false;
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    LL_FOREACH_SAFE(gCred, cred, tempCred)
    {
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        if (memcmp(cred->subject.id, subject->id, sizeof(subject->id)) == 0)
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        {
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            LL_DELETE(gCred, cred);
            FreeCred(cred);
            deleteFlag = 1;
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        }
    }

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    if (deleteFlag)
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    {
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        if (UpdatePersistentStorage(gCred))
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        {
            ret = OC_STACK_RESOURCE_DELETED;
        }
    }
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    return ret;
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}

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/**
 * Remove all credential data on credential resource and persistent storage
 *
 * @retval
 *     OC_STACK_OK              - no errors
 *     OC_STACK_ERROR           - stack process error
 */
OCStackResult RemoveAllCredentials(void)
{
    DeleteCredList(gCred);
    gCred = GetCredDefault();

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    if (!UpdatePersistentStorage(gCred))
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    {
        return OC_STACK_ERROR;
    }
    return OC_STACK_OK;
}

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#if defined(__WITH_DTLS__) || defined(__WITH_TLS__)
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/**
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 * Internal function to fill private data of owner PSK.
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 *
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 * @param receviedCred recevied owner credential from OBT(PT)
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 * @param ownerAdd address of OBT(PT)
 * @param doxm current device's doxm resource
 *
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 * @return
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 *     true successfully done and valid ower psk information
 *     false Invalid owner psk information or failed to owner psk generation
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 */
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static bool FillPrivateDataOfOwnerPSK(OicSecCred_t* receviedCred, const CAEndpoint_t* ownerAddr,
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                           const OicSecDoxm_t* doxm)
{
    //Derive OwnerPSK locally
    const char* oxmLabel = GetOxmString(doxm->oxmSel);
    VERIFY_NON_NULL(TAG, oxmLabel, ERROR);

    uint8_t ownerPSK[OWNER_PSK_LENGTH_128] = {0};
    CAResult_t pskRet = CAGenerateOwnerPSK(ownerAddr,
        (uint8_t*)oxmLabel, strlen(oxmLabel),
        doxm->owner.id