org.libsodium.jni.crypto.Util Maven / Gradle / Ivy
/**
* Copyright 2013 Bruno Oliveira, and individual contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.libsodium.jni.crypto;
import java.util.Arrays;
public class Util {
private static final int DEFAULT_SIZE = 32;
public static byte[] prependZeros(int n, byte[] message) {
byte[] result = new byte[n + message.length];
Arrays.fill(result, (byte) 0);
System.arraycopy(message, 0, result, n, message.length);
return result;
}
public static byte[] removeZeros(int n, byte[] message) {
return Arrays.copyOfRange(message, n, message.length);
}
public static void checkLength(byte[] data, int size) {
if (data == null || data.length != size)
throw new RuntimeException("Invalid size: " + data.length);
}
public static byte[] zeros(int n) {
return new byte[n];
}
public static boolean isValid(int status, String message) {
if (status != 0)
throw new RuntimeException(message);
return true;
}
public static byte[] slice(byte[] buffer, int start, int end) {
return Arrays.copyOfRange(buffer, start, end);
}
public static byte[] merge(byte[] signature, byte[] message) {
byte[] result = new byte[signature.length + message.length];
System.arraycopy(signature, 0, result, 0, signature.length);
System.arraycopy(message, 0, result, signature.length, message.length);
return result;
}
}