public static <A> VigenereKey<A> invertKey(
VigenereKey<A> key, Alphabet<? extends A> basicAlphabet) {
List<Integer> numberKey = key.getKeyAsNumberList();
int[] invKey = new int[numberKey.size()];
int alphaSize = basicAlphabet.getContent().size();
int counter = 0;
for (Integer keyElement : numberKey) {
invKey[counter] = (alphaSize - keyElement) % alphaSize;
counter++;
}
return new VigenereKey<A>(invKey, basicAlphabet);
}
@Override
public List<A> encrypt(List<? extends A> plainText, VigenereKey<A> key)
throws ElementNotInAlphabetException {
List<A> chiffre = new LinkedList<A>();
List<Integer> intKey = key.getKeyAsNumberList();
int counter = 0;
for (A plainTextElement : plainText) {
if (!getPlainTextAlphabet().getContent().contains(plainTextElement)) {
throw new ElementNotInAlphabetException();
}
chiffre.add(
rotateElementAgainstAlphabet(
plainTextElement, intKey.get(counter % intKey.size()), this.getPlainTextAlphabet()));
counter++;
}
return chiffre;
}
