1 /**
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.openejb.util;
18
19 public class HexConverter {
20
21 private HexConverter() {
22 // Disallow instantiation
23 }
24
25 /**
26 * Converts a byte array to its hexadecimal string representation, ie.
27 * new byte[] { 127, 0, 10 } returns "7F000A".
28 *
29 * @param bytes an array of bytes
30 * @return hexadecimal string representation of the first argument
31 */
32 public static String bytesToHex(byte[] bytes) {
33 StringBuilder buf = new StringBuilder(bytes.length * 2);
34 for (byte b : bytes) {
35 buf.append(String.format("%02X", b));
36 }
37 return buf.toString();
38 }
39
40 /**
41 * Converts a hexadecimal formatted string into a corresponding byte array.
42 *
43 * @param hexString a hexadecimal representation of a byte array
44 * @return an array of bytes created from the input
45 */
46 public static byte[] hexToBytes(String hexString) {
47 if (hexString.length() % 2 != 0) {
48 throw new IllegalArgumentException("Invalid number of digits: input must be a string of hexadecimal digit pairs");
49 }
50
51 byte[] bytes = new byte[hexString.length() / 2];
52 for (int i = 0; i < bytes.length; i++) {
53 bytes[i] = (byte) Integer.parseInt(hexString.substring(i * 2, i * 2 + 2), 16);
54 }
55 return bytes;
56 }
57
58 }
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