Reassembling the data can be done in various ways while accomplishing the same result. One method is to use a pointer to an array of data and then store the contents to another array in reflected order both by bit and byte order.

/**
 * Reconfigures the data for CRC computation when comparing to LSB first transmissions.
 *
 * \details Reorders the bits in reverse order of byte submitted
 * and changes the order of bytes computed for CRC. This is required as the data is always
 * transmitted out the UART lsb first.
 *
 * \param    uint8_t  *data pointer to data array.
 * \param    uint32_t length of data array.
 *
 * \returns crc_t CRCvalue from computation.
 */
crc_t formatCRCdata(uint8_t *data, uint32_t length)
{
    uint32_t u32i, u32j;
    uint8_t checkCRC[length];
    crc_t dataCRC;
    // Start copying with LSB as first element in the CRC array
    u32j = length - 1;
    for(u32i = 0; u32i < length; u32i++)         // For each byte in the data packet
    {    
        checkCRC[u32i] = revByte((data[u32j]));  // Reverse the byte
        u32j--;
    }
    dataCRC = crcBitwise(checkCRC, length);      // or TableCRCcalc(checkCRC, length)
    return dataCRC;
}