public BulkData(
byte[] chunkData, int[] chunkX, int[] chunkZ, boolean skylight, short[] bitmap, short[] add) {
this.chunkData = ByteUtils.clone(chunkData);
this.chunkX = Arrays.copyOf(chunkX, chunkX.length);
this.chunkZ = Arrays.copyOf(chunkZ, chunkZ.length);
this.skylight = skylight;
this.bitmap = new short[bitmap.length];
System.arraycopy(bitmap, 0, this.bitmap, 0, bitmap.length);
this.add = new short[add.length];
System.arraycopy(add, 0, this.add, 0, add.length);
}
/** Karazuba multiplication */
private BigIntPolynomial multRecursive(BigIntPolynomial poly2) {
BigInteger[] a = coeffs;
BigInteger[] b = poly2.coeffs;
int n = poly2.coeffs.length;
if (n <= 1) {
BigInteger[] c = Arrays.clone(coeffs);
for (int i = 0; i < coeffs.length; i++) {
c[i] = c[i].multiply(poly2.coeffs[0]);
}
return new BigIntPolynomial(c);
} else {
int n1 = n / 2;
BigIntPolynomial a1 = new BigIntPolynomial(Arrays.copyOf(a, n1));
BigIntPolynomial a2 = new BigIntPolynomial(Arrays.copyOfRange(a, n1, n));
BigIntPolynomial b1 = new BigIntPolynomial(Arrays.copyOf(b, n1));
BigIntPolynomial b2 = new BigIntPolynomial(Arrays.copyOfRange(b, n1, n));
BigIntPolynomial A = (BigIntPolynomial) a1.clone();
A.add(a2);
BigIntPolynomial B = (BigIntPolynomial) b1.clone();
B.add(b2);
BigIntPolynomial c1 = a1.multRecursive(b1);
BigIntPolynomial c2 = a2.multRecursive(b2);
BigIntPolynomial c3 = A.multRecursive(B);
c3.sub(c1);
c3.sub(c2);
BigIntPolynomial c = new BigIntPolynomial(2 * n - 1);
for (int i = 0; i < c1.coeffs.length; i++) {
c.coeffs[i] = c1.coeffs[i];
}
for (int i = 0; i < c3.coeffs.length; i++) {
c.coeffs[n1 + i] = c.coeffs[n1 + i].add(c3.coeffs[i]);
}
for (int i = 0; i < c2.coeffs.length; i++) {
c.coeffs[2 * n1 + i] = c.coeffs[2 * n1 + i].add(c2.coeffs[i]);
}
return c;
}
}
public static byte[] decodeB64UrlSafe(final byte[] data) {
byte[] encode = Arrays.copyOf(data, data.length);
for (int i = 0; i < encode.length; i++) {
if (encode[i] == '-') {
encode[i] = '+';
} else if (encode[i] == '_') {
encode[i] = '/';
}
}
return Base64.decodeBase64(encode);
}
/**
* Subtracts another polynomial which can have a different number of coefficients.
*
* @param b another polynomial
*/
public void sub(BigIntPolynomial b) {
if (b.coeffs.length > coeffs.length) {
int N = coeffs.length;
coeffs = Arrays.copyOf(coeffs, b.coeffs.length);
for (int i = N; i < coeffs.length; i++) {
coeffs[i] = Constants.BIGINT_ZERO;
}
}
for (int i = 0; i < b.coeffs.length; i++) {
coeffs[i] = coeffs[i].subtract(b.coeffs[i]);
}
}
/**
* Multiplies the polynomial by another, taking the indices mod N. Does not change this polynomial
* but returns the result as a new polynomial.<br>
* Both polynomials must have the same number of coefficients.
*
* @param poly2 the polynomial to multiply by
* @return a new polynomial
*/
public BigIntPolynomial mult(BigIntPolynomial poly2) {
int N = coeffs.length;
if (poly2.coeffs.length != N) {
throw new IllegalArgumentException("Number of coefficients must be the same");
}
BigIntPolynomial c = multRecursive(poly2);
if (c.coeffs.length > N) {
for (int k = N; k < c.coeffs.length; k++) {
c.coeffs[k - N] = c.coeffs[k - N].add(c.coeffs[k]);
}
c.coeffs = Arrays.copyOf(c.coeffs, N);
}
return c;
}
private synchronized byte[] createIV(String originalFileName, SecretKey obKey)
throws ObfuscationException {
try {
ivDigest.update(originalFileName.getBytes(PanboxConstants.STANDARD_CHARSET));
ivDigest.update(obKey.getEncoded());
byte[] hash = ivDigest.digest();
// truncate to IV size
return Arrays.copyOf(hash, KeyConstants.SYMMETRIC_BLOCK_SIZE);
} catch (UnsupportedEncodingException e) {
logger.error("Unsupported encoding", e);
throw new ObfuscationException(
"Error creating IV for filename due to unsupported encoding!", e);
}
}
DatabaseKey(byte[] key, Random random) {
this.databaseKey = Arrays.copyOf(key, key.length);
this.random = random;
}