MetakomToDallas.js

async function metakomToDallas(key) {
    //key - ключ в формате FF 65 28 C0

    async function callCRCService(key) {
        let resp = await fetch('https://openapi.lddgo.net/base/gtool/api/v1/Crc?lang=en', {
            method: 'POST',
            headers: {
              'Content-Type': 'application/json;charset=utf-8'
            },
            body: JSON.stringify({algorithm: "crc8Maxim",
            charset: "UTF-8",
            contentType: "hex",
            customCrcParameter: null,
            inputContent: key.replace(/\s+/g, '')})
          })
        
        let result = await resp.json();
        return result.data.hexResult;
    }
    
    let parts = key.split(/\s+/g);
    const key1 = ['00', '00', ...parts, '01'];
    const key2 = ['00', '00', ...parts.reverse(), '01'];

    const key1String = key1.join(' ');
    const key2String = key2.join(' ');

    console.log('Key1 without first byte CRC8: ', key1String);
    console.log('Key2 without first byte CRC8: ', key2String);

    const reversedKey1String = key1.reverse().join(' ');
    const reversedKey2String = key2.reverse().join(' ');

    console.log('Key1 for paste to https://www.lddgo.net/en/encrypt/crc CRC8-MAXIM: ', reversedKey1String);
    console.log('Key2 for paste to https://www.lddgo.net/en/encrypt/crc CRC8-MAXIM: ', reversedKey2String);

    let crc1 = await callCRCService(reversedKey1String);
    console.log('key1 dallas: ', `${crc1} ${key1String}`);
    let crc2 = await callCRCService(reversedKey2String);
    console.log('key2 dallas: ', `${crc2} ${key2String}`)
}