22 lines
748 B
JavaScript
22 lines
748 B
JavaScript
function generateCRC16(payload) {
|
|
let crc = 0xFFFF;
|
|
for (let i = 0; i < payload.length; i++) {
|
|
let c = payload.charCodeAt(i);
|
|
crc ^= (c << 8);
|
|
for (let j = 0; j < 8; j++) {
|
|
if ((crc & 0x8000) !== 0) {
|
|
crc = (crc << 1) ^ 0x1021;
|
|
} else {
|
|
crc = crc << 1;
|
|
}
|
|
}
|
|
crc = crc & 0xFFFF;
|
|
}
|
|
return crc.toString(16).toUpperCase().padStart(4, '0');
|
|
}
|
|
|
|
const payload = "00020126360014br.gov.bcb.pix0114+5511961534225520400005303986540520.005802BR5917Ricardo Goncalves6021Sao Bernardo do campo62070503***6304";
|
|
console.log("Payload:", payload);
|
|
console.log("Calculated CRC:", generateCRC16(payload));
|
|
console.log("Expected CRC:", "407E");
|