node-red-contrib-symi/lib/crc16.js

Node-RED nodes for smart home device communication with Home Assistant integration, supporting HassKit, Clowire, Alive, LF and complete Symi protocols

/**
 * CRC16校验算法
 * 用于数据完整性验证
 */

function crc16(data) {
    let crc = 0xFFFF;
    
    for (let i = 0; i < data.length; i++) {
        crc ^= data[i];
        for (let j = 0; j < 8; j++) {
            if (crc & 0x0001) {
                crc = (crc >> 1) ^ 0xA001;
            } else {
                crc = crc >> 1;
            }
        }
    }
    
    return crc;
}

module.exports = crc16;