verifyEmvQr function
verify emvqr
check if emv data is true
Implementation
bool verifyEmvQr(String value) {
final emqrForChecksum = value.substring(0, value.length - 4);
final emqrForCheckEmv = value.substring(value.length - 4, value.length);
final checksum = CRC16().checkSum(utf8.encode(emqrForChecksum));
if (checksum.err != null) {
return false;
}
var checkSumValue = checksum.value.toRadixString(16);
for (var i = checkSumValue.length; i < 4; i++) {
checkSumValue = "0$checkSumValue";
}
return emqrForCheckEmv == checkSumValue.toUpperCase();
}