hexToU8 method
Convert hex string to Uint8List
Implementation
Uint8List hexToU8(String hex) {
if (hex.length % 2 == 1) {
hex = "0" + hex;
}
int len = hex.length ~/ 2;
Uint8List u8 = new Uint8List(len);
var j = 0;
for (int i = 0; i < len; i++) {
u8[i] = int.parse(hex.substring(j, j + 2), radix: 16);
j += 2;
}
return u8;
}