/*
* Copyright 2016 Realm Inc.
*
* 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 io.realm.transformer;
import javax.xml.bind.DatatypeConverter;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class Utils {
/**
* Encode the given string with Base64
* @param data the string to encode
* @return the encoded string
* @throws UnsupportedEncodingException
*/
public static String base64Encode(String data) throws UnsupportedEncodingException {
return DatatypeConverter.printBase64Binary(data.getBytes("UTF-8"));
}
/**
* Compute the SHA-256 hash of the given byte array
* @param data the byte array to hash
* @return the hashed byte array
* @throws NoSuchAlgorithmException
*/
public static byte[] sha256Hash(byte[] data) throws NoSuchAlgorithmException {
MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
return messageDigest.digest(data);
}
/**
* Convert a byte array to its hex-string
* @param data the byte array to convert
* @return the hex-string of the byte array
*/
public static String hexStringify(byte[] data) {
StringBuilder stringBuilder = new StringBuilder();
for (byte singleByte : data) {
stringBuilder.append(Integer.toString((singleByte & 0xff) + 0x100, 16).substring(1));
}
return stringBuilder.toString();
}
}