init method

  1. @override
void init(
  1. bool forEncryption,
  2. CipherParameters? params
)
override

Init the cipher with its initialization params. The type of CipherParameters depends on the algorithm being used (see the documentation of each implementation to find out more).

Use the argument forEncryption to tell the cipher if you want to encrypt or decrypt data.

Implementation

@override
void init(bool forEncryption, CipherParameters? params) {
  if (params is KeyParameter) {
    var keyMaster = params.key;

    if (keyMaster.length != 24 && keyMaster.length != 16) {
      throw ArgumentError('key size must be 16 or 24 bytes.');
    }

    this.forEncryption = forEncryption;

    var key1 = Uint8List(8);

    _arrayCopy(keyMaster, 0, key1, 0, key1.length);
    workingKey1 = generateWorkingKey(forEncryption, key1);

    var key2 = Uint8List(8);
    _arrayCopy(keyMaster, 8, key2, 0, key2.length);
    workingKey2 = generateWorkingKey(!forEncryption, key2);

    if (keyMaster.length == 24) {
      var key3 = Uint8List(8);
      _arrayCopy(keyMaster, 16, key3, 0, key3.length);
      workingKey3 = generateWorkingKey(forEncryption, key3);
    } else {
      workingKey3 = workingKey1;
    }
  }
}