private void init(int layers, int[] heightOfTrees, int[] winternitzParameter, int[] K)
throws IllegalArgumentException {
boolean valid = true;
String errMsg = "";
this.numOfLayers = layers;
if ((numOfLayers != winternitzParameter.length)
|| (numOfLayers != heightOfTrees.length)
|| (numOfLayers != K.length)) {
valid = false;
errMsg = "Unexpected parameterset format";
}
for (int i = 0; i < numOfLayers; i++) {
if ((K[i] < 2) || ((heightOfTrees[i] - K[i]) % 2 != 0)) {
valid = false;
errMsg = "Wrong parameter K (K >= 2 and H-K even required)!";
}
if ((heightOfTrees[i] < 4) || (winternitzParameter[i] < 2)) {
valid = false;
errMsg = "Wrong parameter H or w (H > 3 and w > 1 required)!";
}
}
if (valid) {
this.heightOfTrees = Arrays.clone(heightOfTrees);
this.winternitzParameter = Arrays.clone(winternitzParameter);
this.K = Arrays.clone(K);
} else {
throw new IllegalArgumentException(errMsg);
}
}
private static void SMix(int[] B, int BOff, int N, int r) {
int BCount = r * 32;
int[] blockX1 = new int[16];
int[] blockX2 = new int[16];
int[] blockY = new int[BCount];
int[] X = new int[BCount];
int[][] V = new int[N][];
try {
System.arraycopy(B, BOff, X, 0, BCount);
for (int i = 0; i < N; ++i) {
V[i] = Arrays.clone(X);
BlockMix(X, blockX1, blockX2, blockY, r);
}
int mask = N - 1;
for (int i = 0; i < N; ++i) {
int j = X[BCount - 16] & mask;
Xor(X, V[j], 0, X);
BlockMix(X, blockX1, blockX2, blockY, r);
}
System.arraycopy(X, 0, B, BOff, BCount);
} finally {
ClearAll(V);
ClearAll(new int[][] {X, blockX1, blockX2, blockY});
}
}
/**
* Returns the parameter K needed for authentication path computation
*
* @return The parameter K needed for authentication path computation
*/
public int[] getK() {
return Arrays.clone(K);
}
/**
* Returns the array of WinternitzParameter (for each layer) of the authentication trees
*
* @return The array of WinternitzParameter (for each layer) of the authentication trees
*/
public int[] getWinternitzParameter() {
return Arrays.clone(winternitzParameter);
}
/**
* Returns the array of height (for each layer) of the authentication trees
*
* @return The array of height (for each layer) of the authentication trees
*/
public int[] getHeightOfTrees() {
return Arrays.clone(heightOfTrees);
}