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/*
* Copyright (C) 2018 The Android Open Source Project
*
* 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 com.android.ike.ikev2.message;
/** TestUtils provides utility methods for parsing Hex String */
public final class TestUtils {
/**
* Converts the unsigned Hex String to a byte array.
*
* @param hexString hex representation of an unsigned value.
* @return the converted byte array.
* @throws IllegalArgumentException when length of Hex String is an odd number.
*/
public static byte[] hexStringToByteArray(String hexString) throws IllegalArgumentException {
int len = hexString.length();
if (len % 2 != 0) {
throw new IllegalArgumentException("Invalid Hex String");
}
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] =
(byte)
((Character.digit(hexString.charAt(i), 16) << 4)
+ Character.digit(hexString.charAt(i + 1), 16));
}
return data;
}
}
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