credresource.c 102 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 "iotivity_config.h"
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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>
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#include <stdbool.h>
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#include <inttypes.h>
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#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 "oic_string.h"
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#include "ocpayload.h"
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#include "ocpayloadcbor.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 __unix__
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#endif

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#define TAG  "OIC_SRM_CREDL"
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#ifdef HAVE_WINDOWS_H
#include <wincrypt.h>
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#include <intsafe.h>
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#endif


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/** Max credential types number used for TLS */
#define MAX_TYPE 2
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/** 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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/** 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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typedef enum CredCompareResult{
    CRED_CMP_EQUAL = 0,
    CRED_CMP_NOT_EQUAL = 1,
    CRED_CMP_ERROR = 2
}CredCompareResult_t;

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static bool ValueWithinBounds(uint64_t value, uint64_t maxValue)
{
    if (value > maxValue)
    {
        OIC_LOG_V(ERROR, TAG, "The value (%ull) is greater than allowed maximum of %ull.", value, maxValue);
        return false;
    }

    return true;
}

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/**
 * Internal function to check a subject of SIGNED_ASYMMETRIC_KEY(Certificate).
 * If that subject is NULL or wildcard, set it to own deviceID.
 * @param cred credential on SVR DB file
 * @param deviceID own deviceuuid of doxm resource
 *
 * @return
 *     true successfully done
 *     false Invalid cred
 */

static bool CheckSubjectOfCertificate(OicSecCred_t* cred, OicUuid_t deviceID)
{
    OicUuid_t emptyUuid = {.id={0}};
    OIC_LOG(DEBUG, TAG, "IN CheckSubjectOfCertificate");
    VERIFY_NOT_NULL(TAG, cred, ERROR);

#if defined(__WITH_DTLS__) || defined(__WITH_TLS__)
    if ( SIGNED_ASYMMETRIC_KEY == cred->credType)
    {
        if((0 == memcmp(cred->subject.id, emptyUuid.id, sizeof(cred->subject.id))) ||
            (0 == memcmp(cred->subject.id, &WILDCARD_SUBJECT_ID, sizeof(cred->subject.id))))
        {
            memcpy(cred->subject.id, deviceID.id, sizeof(deviceID.id));
        }
    }
#endif

    OIC_LOG(DEBUG, TAG, "OUT CheckSubjectOfCertificate");
    return true;
exit:
    OIC_LOG(ERROR, TAG, "OUT CheckSubjectOfCertificate");
    return false;
}

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/**
 * Internal function to check credential
 */
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static bool IsValidCredential(const OicSecCred_t* cred)
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{
    OicUuid_t emptyUuid = {.id={0}};


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    OIC_LOG(DEBUG, TAG, "IN IsValidCredential");
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    VERIFY_NOT_NULL(TAG, cred, ERROR);
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    VERIFY_SUCCESS(TAG, 0 != cred->credId, ERROR);
    OIC_LOG_V(DEBUG, TAG, "Cred ID = %d", cred->credId);

#if defined(__WITH_DTLS__) || defined(__WITH_TLS__)
    OIC_LOG_V(DEBUG, TAG, "Cred Type = %d", cred->credType);

    switch(cred->credType)
    {
        case SYMMETRIC_PAIR_WISE_KEY:
        case SYMMETRIC_GROUP_KEY:
        case PIN_PASSWORD:
        {
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            VERIFY_NOT_NULL(TAG, cred->privateData.data, ERROR);
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            VERIFY_SUCCESS(TAG, 0 != cred->privateData.len, ERROR);
            VERIFY_SUCCESS(TAG, \
                           (OIC_ENCODING_RAW == cred->privateData.encoding || \
                           OIC_ENCODING_BASE64 == cred->privateData.encoding), \
                           ERROR);
            break;
        }
        case ASYMMETRIC_KEY:
        {
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            VERIFY_NOT_NULL(TAG, cred->publicData.data, ERROR);
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            VERIFY_SUCCESS(TAG, 0 != cred->publicData.len, ERROR);
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            VERIFY_SUCCESS(TAG, \
                           (OIC_ENCODING_UNKNOW < cred->publicData.encoding && \
                            OIC_ENCODING_DER >= cred->publicData.encoding),
                           ERROR);
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            break;
        }
        case SIGNED_ASYMMETRIC_KEY:
        {
            VERIFY_SUCCESS(TAG, (NULL != cred->publicData.data ||NULL != cred->optionalData.data) , ERROR);
            VERIFY_SUCCESS(TAG, (0 != cred->publicData.len || 0 != cred->optionalData.len), ERROR);

            if(NULL != cred->optionalData.data)
            {
                VERIFY_SUCCESS(TAG, \
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                               (OIC_ENCODING_UNKNOW < cred->optionalData.encoding && \
                                OIC_ENCODING_DER >= cred->optionalData.encoding),
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                               ERROR);
            }
            break;
        }
        case ASYMMETRIC_ENCRYPTION_KEY:
        {
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            VERIFY_NOT_NULL(TAG, cred->privateData.data, ERROR);
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            VERIFY_SUCCESS(TAG, 0 != cred->privateData.len, ERROR);
            VERIFY_SUCCESS(TAG, \
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                           (OIC_ENCODING_UNKNOW < cred->privateData.encoding && \
                            OIC_ENCODING_DER >= cred->privateData.encoding),
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                           ERROR);
            break;
        }
        default:
        {
            OIC_LOG(WARNING, TAG, "Unknown credential type");
            return false;
        }
    }
#endif

    VERIFY_SUCCESS(TAG, 0 != memcmp(emptyUuid.id, cred->subject.id, sizeof(cred->subject.id)), ERROR);

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    OIC_LOG(DEBUG, TAG, "OUT IsValidCredential");
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    return true;
exit:
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    OIC_LOG(WARNING, TAG, "OUT IsValidCredential : Invalid Credential detected.");
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    return false;
}

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static bool IsEmptyCred(const OicSecCred_t* cred)
{
    OicUuid_t emptyUuid = {.id={0}};

    VERIFY_SUCCESS(TAG, (0 == memcmp(cred->subject.id, emptyUuid.id, sizeof(emptyUuid))), ERROR);
    VERIFY_SUCCESS(TAG, (0 == cred->credId), ERROR);
    VERIFY_SUCCESS(TAG, (0 == cred->credType), ERROR);
#if defined(__WITH_DTLS__) || defined(__WITH_TLS__)
    VERIFY_SUCCESS(TAG, (NULL == cred->privateData.data), ERROR);
    VERIFY_SUCCESS(TAG, (NULL == cred->publicData.data), ERROR);
    VERIFY_SUCCESS(TAG, (NULL == cred->optionalData.data), ERROR);
    VERIFY_SUCCESS(TAG, (NULL == cred->credUsage), ERROR);
#endif
    return true;
exit:
    return false;
}

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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
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#if defined(__WITH_DTLS__) || defined(__WITH_TLS__)
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     // TODO: Need to check credUsage.
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    OICFree(cred->publicData.data);
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    OICFree(cred->optionalData.data);
    OICFree(cred->credUsage);

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#endif /* __WITH_DTLS__ ||  __WITH_TLS__*/
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    //Clean PrivateData
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    OICClearMemory(cred->privateData.data, cred->privateData.len);
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    OICFree(cred->privateData.data);
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    //Clean Period
    OICFree(cred->period);
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#ifdef MULTIPLE_OWNER
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    //Clean eowner
    OICFree(cred->eownerID);
#endif

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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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size_t GetCredKeyDataSize(const OicSecCred_t* cred)
{
    size_t size = 0;
    if (cred)
    {
        OicSecCred_t *credPtr = NULL, *credTmp = NULL;
        LL_FOREACH_SAFE((OicSecCred_t*)cred, credPtr, credTmp)
        {
            if (credPtr->privateData.data && 0 < credPtr->privateData.len)
            {
                size += credPtr->privateData.len;
            }
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#if defined(__WITH_DTLS__) || defined(__WITH_TLS__)
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            if (credPtr->publicData.data && 0 < credPtr->publicData.len)
            {
                size += credPtr->publicData.len;
            }
            if (credPtr->optionalData.data && 0 < credPtr->optionalData.len)
            {
                size += credPtr->optionalData.len;
            }
#endif
        }
    }
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    OIC_LOG_V(DEBUG, TAG, "Cred Key Data Size : %zd\n", size);
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    return size;
}

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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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static const char* EncodingValueToString(OicEncodingType_t encoding)
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{
    switch (encoding)
    {
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        case OIC_ENCODING_RAW:    return OIC_SEC_ENCODING_RAW;
        case OIC_ENCODING_BASE64: return OIC_SEC_ENCODING_BASE64;
        case OIC_ENCODING_DER:    return OIC_SEC_ENCODING_DER;
        case OIC_ENCODING_PEM:    return OIC_SEC_ENCODING_PEM;
        default:                  return NULL;
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    }
}

static CborError SerializeEncodingToCborInternal(CborEncoder *map, const OicSecKey_t *value)
{
    CborError cborEncoderResult = CborNoError;
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    const char *encoding = EncodingValueToString(value->encoding);
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    if (encoding)
    {
        cborEncoderResult = cbor_encode_text_string(map, OIC_JSON_ENCODING_NAME,
            strlen(OIC_JSON_ENCODING_NAME));
        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Encoding Tag.");
        cborEncoderResult = cbor_encode_text_string(map, encoding,
            strlen(encoding));
        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Encoding Value.");

        cborEncoderResult = cbor_encode_text_string(map, OIC_JSON_DATA_NAME,
            strlen(OIC_JSON_DATA_NAME));
        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Name Tag.");
        if (OIC_ENCODING_DER == value->encoding ||
            OIC_ENCODING_RAW == value->encoding)
        {
            cborEncoderResult = cbor_encode_byte_string(map,
                    value->data, value->len);
        }
        else
        {
            cborEncoderResult = cbor_encode_text_string(map,
                    (char*)value->data, value->len);
        }
        VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Name Value.");
    }
    else
    {
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        OIC_LOG_V(ERROR, TAG, "Unknown encoding type: %u.", value->encoding);
        return CborErrorUnknownType;
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    }
    exit:
    return cborEncoderResult;
}

static CborError SerializeEncodingToCbor(CborEncoder *rootMap, const char* tag, const OicSecKey_t *value)
{
    CborError cborEncoderResult = CborNoError;
    CborEncoder map;
    const size_t mapSize = 2;

    cborEncoderResult = cbor_encode_text_string(rootMap, tag, strlen(tag));
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding PrivateData Tag.");

    cborEncoderResult = cbor_encoder_create_map(rootMap, &map, mapSize);
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Map");

    VERIFY_CBOR_SUCCESS(TAG, SerializeEncodingToCborInternal(&map, value),
                        "Failed adding OicSecKey_t structure");

    cborEncoderResult = cbor_encoder_close_container(rootMap, &map);
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Closing Map.");

    exit:
    return cborEncoderResult;
}

static CborError SerializeSecOptToCbor(CborEncoder *rootMap, const char* tag, const OicSecOpt_t *value)
{
    CborError cborEncoderResult = CborNoError;
    CborEncoder map;
    const size_t mapSize = 3;

    cborEncoderResult = cbor_encode_text_string(rootMap, tag, strlen(tag));
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding PrivateData Tag.");

    cborEncoderResult = cbor_encoder_create_map(rootMap, &map, mapSize);
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding Map");

    OicSecKey_t in;
    in.data = value->data;
    in.encoding = value->encoding;
    in.len = value->len;

    VERIFY_CBOR_SUCCESS(TAG, SerializeEncodingToCborInternal(&map, &in),
                        "Failed adding OicSecKey_t structure");

    cborEncoderResult = cbor_encode_text_string(&map, OIC_JSON_REVOCATION_STATUS_NAME,
        strlen(OIC_JSON_REVOCATION_STATUS_NAME));
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional revstat Tag.");
    cborEncoderResult = cbor_encode_boolean(&map, value->revstat);
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding optional revstat Value.");

    cborEncoderResult = cbor_encoder_close_container(rootMap, &map);
    VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Closing Map.");

    exit:
    return cborEncoderResult;
}

static CborError DeserializeEncodingFromCborInternal(CborValue *map, char *name, OicSecKey_t *value)
{
    size_t len = 0;
    CborError cborFindResult = CborNoError;

    // data -- Mandatory
    if (strcmp(name, OIC_JSON_DATA_NAME) == 0)
    {
        if(cbor_value_is_byte_string(map))
        {
            cborFindResult = cbor_value_dup_byte_string(map, &value->data,
                &value->len, NULL);
        }
        else if(cbor_value_is_text_string(map))
        {
            cborFindResult = cbor_value_dup_text_string(map, (char**)(&value->data),
                &value->len, NULL);
        }
        else
        {
            cborFindResult = CborErrorUnknownType;
            OIC_LOG(ERROR, TAG, "Unknown type for private data.");
        }
        VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding PrivateData.");
    }

    // encoding -- Mandatory
    if (strcmp(name, OIC_JSON_ENCODING_NAME) == 0)
    {
        char* strEncoding = NULL;
        cborFindResult = cbor_value_dup_text_string(map, &strEncoding, &len, NULL);
        VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding EncodingType");

        if(strcmp(strEncoding, OIC_SEC_ENCODING_RAW) == 0)
        {
            value->encoding = OIC_ENCODING_RAW;
        }
        else if(strcmp(strEncoding, OIC_SEC_ENCODING_BASE64) == 0)
        {
            value->encoding = OIC_ENCODING_BASE64;
        }
        else if(strcmp(strEncoding, OIC_SEC_ENCODING_DER) == 0)
        {
            value->encoding = OIC_ENCODING_DER;
        }
        else if(strcmp(strEncoding, OIC_SEC_ENCODING_PEM) == 0)
        {
            value->encoding = OIC_ENCODING_PEM;
        }
        else
        {
            //For unit test
            value->encoding = OIC_ENCODING_RAW;
            OIC_LOG(WARNING, TAG, "Unknown encoding type detected.");
        }
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        //Because cbor using malloc directly, it is required to use free() instead of OICFree
        free(strEncoding);
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    }
    exit:
    return cborFindResult;
}

static CborError DeserializeEncodingFromCbor(CborValue *rootMap, OicSecKey_t *value)
{
    CborValue map = { .parser = NULL };
    CborError cborFindResult = cbor_value_enter_container(rootMap, &map);
    size_t len = 0;

    while (cbor_value_is_valid(&map))
    {
        char* name = NULL;
        CborType type = cbor_value_get_type(&map);
        if (type == CborTextStringType && cbor_value_is_text_string(&map))
        {
            cborFindResult = cbor_value_dup_text_string(&map, &name, &len, NULL);
            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed to get text");
            cborFindResult = cbor_value_advance(&map);
            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed to advance value");
        }
        if (name)
        {
            VERIFY_CBOR_SUCCESS(TAG, DeserializeEncodingFromCborInternal(&map, name, value),
                                "Failed to read OicSecKey_t value");
        }
        if (cbor_value_is_valid(&map))
        {
            cborFindResult = cbor_value_advance(&map);
            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Advancing Map.");
        }
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        //Because cbor using malloc directly, it is required to use free() instead of OICFree
        free(name);
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    }
    exit:
    return cborFindResult;
}

static CborError DeserializeSecOptFromCbor(CborValue *rootMap, OicSecOpt_t *value)
{
    CborValue map = { .parser = NULL };
    CborError cborFindResult = cbor_value_enter_container(rootMap, &map);
    size_t len = 0;
    value->revstat = false;

    while (cbor_value_is_valid(&map))
    {
        char* name = NULL;
        CborType type = cbor_value_get_type(&map);
        if (type == CborTextStringType && cbor_value_is_text_string(&map))
        {
            cborFindResult = cbor_value_dup_text_string(&map, &name, &len, NULL);
            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed to get text");
            cborFindResult = cbor_value_advance(&map);
            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed to advance value");
        }
        if (name)
        {
            // OptionalData::revstat -- Mandatory
            if (strcmp(name, OIC_JSON_REVOCATION_STATUS_NAME) == 0)
            {
                cborFindResult = cbor_value_get_boolean(&map, &value->revstat);
                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding revstat Value.")
            }
            OicSecKey_t out;
            VERIFY_CBOR_SUCCESS(TAG, DeserializeEncodingFromCborInternal(&map, name, &out),
                                "Failed to read OicSecKey_t value");

            value->data = out.data;
            value->encoding = out.encoding;
            value->len = out.len;
        }
        if (cbor_value_is_valid(&map))
        {
            cborFindResult = cbor_value_advance(&map);
            VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Advancing Map.");
        }
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        //Because cbor using malloc directly, it is required to use free() instead of OICFree
        free(name);
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    }
    exit:
    return cborFindResult;
}

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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_NOT_NULL_RETURN(TAG, outPayload, ERROR, OC_STACK_ERROR);

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    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_DTLS__) || defined(__WITH_TLS__)
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#ifdef MULTIPLE_OWNER
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        if(cred->eownerID)
        {
            mapSize++;
        }
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#endif //MULTIPLE_OWNER
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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++;
        }
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#endif /* __WITH_DTLS__ ||  __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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        //PublicData -- Not Mandatory
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        if (SIGNED_ASYMMETRIC_KEY == cred->credType && cred->publicData.data)
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        {
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            cborEncoderResult = SerializeEncodingToCbor(&credMap,
                                         OIC_JSON_PUBLICDATA_NAME, &cred->publicData);
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            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding PublicData Tag.");
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        }
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        //OptionalData -- Not Mandatory
        if (SIGNED_ASYMMETRIC_KEY == cred->credType && cred->optionalData.data)
        {
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            cborEncoderResult = SerializeSecOptToCbor(&credMap,
                                         OIC_JSON_OPTDATA_NAME, &cred->optionalData);
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            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding OptionalData Tag.");
        }
        //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.");
        }
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#endif /* __WITH_DTLS__ ||  __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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            cborEncoderResult = SerializeEncodingToCbor(&credMap,
                                         OIC_JSON_PRIVATEDATA_NAME, &cred->privateData);
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            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding PrivateData Tag.");
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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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#ifdef MULTIPLE_OWNER
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        // Eownerid -- Not Mandatory
        if(cred->eownerID)
        {
            char *eowner = NULL;
            cborEncoderResult = cbor_encode_text_string(&credMap, OIC_JSON_EOWNERID_NAME,
                strlen(OIC_JSON_EOWNERID_NAME));
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Adding eownerId Name Tag.");
            ret = ConvertUuidToStr(cred->eownerID, &eowner);
            VERIFY_SUCCESS(TAG, ret == OC_STACK_OK, ERROR);
            cborEncoderResult = cbor_encode_text_string(&credMap, eowner, strlen(eowner));
            VERIFY_CBOR_SUCCESS(TAG, cborEncoderResult, "Failed Addding eownerId Value.");
            OICFree(eowner);
        }
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#endif //MULTIPLE_OWNER
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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;
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        *cborSize = cbor_encoder_get_buffer_size(&encoder, 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.
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        cborLen += cbor_encoder_get_buffer_size(&encoder, encoder.end);
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        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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    if (!cbor_value_is_container(&credCbor))
    {
        return OC_STACK_ERROR;
    }

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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
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                size_t tempLen = 0;
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                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;
                    }

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                    VERIFY_NOT_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;
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                        CborType cmType = cbor_value_get_type(&credMap);
                        if (cmType == CborTextStringType)
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                        {
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                            cborFindResult = cbor_value_dup_text_string(&credMap, &name, &tempLen, NULL);
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                            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;
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                                cborFindResult = cbor_value_dup_text_string(&credMap, &subjectid, &tempLen, NULL);
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                                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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                                //Because cbor using malloc directly
                                //It is required to use free() instead of OICFree
                                free(subjectid);
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                            }
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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)
                            {
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                                cborFindResult = DeserializeEncodingFromCbor(&credMap, &cred->privateData);
                                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed to read privateData structure");
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                                OicEncodingType_t encoding = cred->privateData.encoding;
                                if (OIC_ENCODING_DER == encoding || OIC_ENCODING_PEM == encoding)
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                                {
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                                    //For unit test
                                    cred->privateData.encoding = OIC_ENCODING_RAW;
                                    OIC_LOG(WARNING, TAG, "Unknown encoding type detected for private data.");
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                                }
                            }
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#if defined(__WITH_DTLS__) || defined(__WITH_TLS__)
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                            //PublicData -- Not Mandatory
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                            if (strcmp(name, OIC_JSON_PUBLICDATA_NAME)  == 0)
                            {
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                                cborFindResult = DeserializeEncodingFromCbor(&credMap, &cred->publicData);
                                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed to read publicData structure");
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                            }
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                            //OptionalData -- Not Mandatory
                            if (strcmp(name, OIC_JSON_OPTDATA_NAME)  == 0)
                            {
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                                cborFindResult = DeserializeSecOptFromCbor(&credMap, &cred->optionalData);
                                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed to read optionalData structure");
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                            }
                            //Credusage -- Not Mandatory
                            if (0 == strcmp(OIC_JSON_CREDUSAGE_NAME, name))
                            {
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                                cborFindResult = cbor_value_dup_text_string(&credMap, &cred->credUsage, &tempLen, NULL);
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                                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding Period.");
                            }
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#endif  //__WITH_DTLS__ ||  __WITH_TLS__
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                            if (0 == strcmp(OIC_JSON_PERIOD_NAME, name))
                            {
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                                cborFindResult = cbor_value_dup_text_string(&credMap, &cred->period, &tempLen, NULL);
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                                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding Period.");
                            }

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#ifdef MULTIPLE_OWNER
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                            // Eowner uuid -- Not Mandatory
                            if (strcmp(OIC_JSON_EOWNERID_NAME, name)  == 0 && cbor_value_is_text_string(&credMap))
                            {
                                char *eowner = NULL;
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                                cborFindResult = cbor_value_dup_text_string(&credMap, &eowner, &tempLen, NULL);
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                                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Finding eownerId Value.");
                                if(NULL == cred->eownerID)
                                {
                                    cred->eownerID = (OicUuid_t*)OICCalloc(1, sizeof(OicUuid_t));
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                                    VERIFY_NOT_NULL(TAG, cred->eownerID, ERROR);
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                                }
                                ret = ConvertStrToUuid(eowner, cred->eownerID);
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                                //Because cbor using malloc directly
                                //It is required to use free() instead of OICFree
                                free(eowner);
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                                VERIFY_SUCCESS(TAG, OC_STACK_OK == ret , ERROR);
                            }
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#endif //MULTIPLE_OWNER
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                            if (cbor_value_is_valid(&credMap))
                            {
                                cborFindResult = cbor_value_advance(&credMap);
                                VERIFY_CBOR_SUCCESS(TAG, cborFindResult, "Failed Advancing CRED Map.");
                            }
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                            //Because cbor using malloc directly
                            //It is required to use free() instead of OICFree
                            free(name);
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                        }
                    }
                    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);
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                //Because cbor using malloc directly
                //It is required to use free() instead of OICFree
                free(stRowner);
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            }
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            else if (NULL != gCred)
            {
                memcpy(&(headCred->rownerID), &(gCred->rownerID), sizeof(OicUuid_t));
            }
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            //Because cbor using malloc directly
            //It is required to use free() instead of OICFree
            free(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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}

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#ifdef MULTIPLE_OWNER
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bool IsValidCredentialAccessForSubOwner(const OicUuid_t* uuid, const uint8_t *cborPayload, size_t size)
{
    OicSecCred_t* cred = NULL;
    bool isValidCred = false;

    OIC_LOG_BUFFER(DEBUG, TAG, cborPayload, size);

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    VERIFY_NOT_NULL(TAG, uuid, ERROR);
    VERIFY_NOT_NULL(TAG, cborPayload, ERROR);
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    VERIFY_SUCCESS(TAG, 0 != size, ERROR);
    VERIFY_SUCCESS(TAG, OC_STACK_OK == CBORPayloadToCred(cborPayload, size, &cred), ERROR);
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    VERIFY_NOT_NULL(TAG, cred, ERROR);
    VERIFY_NOT_NULL(TAG, cred->eownerID, ERROR);
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    VERIFY_SUCCESS(TAG, (memcmp(cred->eownerID->id, uuid->id, sizeof(uuid->id)) == 0), ERROR);

    isValidCred = true;

exit:
    DeleteCredList(cred);

    return isValidCred;

}
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#endif //MULTIPLE_OWNER
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OicSecCred_t * GenerateCredential(const OicUuid_t * subject, OicSecCredType_t credType,
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                                  const OicSecKey_t * publicData, const OicSecKey_t* privateData,
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                                  const OicUuid_t * rownerID, const OicUuid_t * eownerID)
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{
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