48 lines
1.5 KiB
Java
48 lines
1.5 KiB
Java
// Copyright 2021 Paul Schaub, @maybeWeCouldStealAVan, @Dave L.
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// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package sop.util;
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public class HexUtil {
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private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();
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/**
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* Encode a byte array to a hex string.
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*
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* @see <a href="https://stackoverflow.com/a/9855338">
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* How to convert a byte array to a hex string in Java?</a>
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* @param bytes bytes
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* @return hex encoding
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*/
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public static String bytesToHex(byte[] bytes) {
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char[] hexChars = new char[bytes.length * 2];
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for (int j = 0; j < bytes.length; j++) {
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int v = bytes[j] & 0xFF;
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hexChars[j * 2] = HEX_ARRAY[v >>> 4];
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hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
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}
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return new String(hexChars);
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}
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/**
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* Decode a hex string into a byte array.
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*
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* @see <a href="https://stackoverflow.com/a/140861">
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* Convert a string representation of a hex dump to a byte array using Java?</a>
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* @param s hex string
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* @return decoded byte array
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*/
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public static byte[] hexToBytes(String s) {
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int len = s.length();
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byte[] data = new byte[len / 2];
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for (int i = 0; i < len; i += 2) {
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data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
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+ Character.digit(s.charAt(i + 1), 16));
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}
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return data;
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}
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}
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