deriveKeyAndIV method
Implementation
Tuple2<Uint8List, Uint8List> deriveKeyAndIV(
String passphrase, Uint8List salt) {
var password = createUint8ListFromString(passphrase);
Uint8List concatenatedHashes = Uint8List(0);
Uint8List currentHash = Uint8List(0);
bool enoughBytesForKey = false;
Uint8List preHash = Uint8List(0);
while (!enoughBytesForKey) {
if (currentHash.length > 0)
preHash = Uint8List.fromList(currentHash + password + salt);
else
preHash = Uint8List.fromList(password + salt);
currentHash = md5.convert(preHash).bytes as Uint8List;
concatenatedHashes = Uint8List.fromList(concatenatedHashes + currentHash);
if (concatenatedHashes.length >= 48) enoughBytesForKey = true;
}
var keyBtyes = concatenatedHashes.sublist(0, 32);
var ivBtyes = concatenatedHashes.sublist(32, 48);
return new Tuple2(keyBtyes, ivBtyes);
}