/// <summary>
        /// Get the Integrity key
        /// </summary>
        /// <returns>key as string.</returns>
        private async Task<string> GetChannelIntegrityKey()
        {
            ResourceExtendedInformation extendedInformation = null;
            try
            {
                extendedInformation = await this.GetExtendedInfo();
            }
            catch (Exception exception)
            {
                CloudException cloudException = exception as CloudException;

                if (cloudException != null && cloudException.Response != null && !string.IsNullOrEmpty(cloudException.Response.Content))
                {
                    JavaScriptSerializer serializer = new JavaScriptSerializer();
                    rpError.Error error = serializer.Deserialize<rpError.Error>(cloudException.Response.Content);

                    // rpError.Error error = (rpError.Error)Utilities.Deserialize<rpError.Error>(cloudException.Response.Content);
                    if (error.ErrorCode.Equals(RpErrorCode.ResourceExtendedInfoNotFound.ToString(), StringComparison.InvariantCultureIgnoreCase))
                    {
                        extendedInformation = new ResourceExtendedInformation();
                    }
                }
            }

            ResourceExtendedInfo extendedInfo = Utilities.Deserialize<ResourceExtendedInfo>(extendedInformation.ExtendedInfo);

            if (extendedInfo == null)
            {
                extendedInfo = this.CreateVaultExtendedInformation();
            }
            else
            {
                if (!extendedInfo.Algorithm.Equals(CryptoAlgorithm.None.ToString(), StringComparison.InvariantCultureIgnoreCase))
                {
                    // In case this condition is true that means the credential was first generated in portal
                    // and hence can not be fetched here.
                    throw new CloudException(Resources.VaultSettingsGenerationUnSupported);
                }
            }

            return extendedInfo.ChannelIntegrityKey;
        }