30 lines
845 B
JavaScript
30 lines
845 B
JavaScript
"use strict";
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import aes from 'aes-js';
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const offset_id = 0;
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const offset_lat = 32 / 8;
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const offset_lng = (32 / 8) + (32 / 8);
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function decode_payload(payload_base64, key_hex) {
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let payload_buffer_enc = Buffer.from(payload_base64, "base64");
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let key_buffer = Buffer.from(key_hex, "hex");
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// console.log(payload_buffer_enc);
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let aes_ecb = new aes.ModeOfOperation.ecb(key_buffer);
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let payload_buffer = Buffer.from(aes_ecb.decrypt(payload_buffer_enc).buffer);
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// console.debug(payload_buffer);
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// console.debug(`Offsets: ${offset_id}, ${offset_lat}, ${offset_lng}`);
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// console.debug(`Message hex: ${payload_buffer.toString("hex")}`)
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return {
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id: payload_buffer.readUInt32LE(offset_id),
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latitude: payload_buffer.readFloatLE(offset_lat),
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longitude: payload_buffer.readFloatLE(offset_lng)
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};
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}
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export { decode_payload };
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