1 package org.apache.fulcrum.jce.crypto;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 /**
23 * Helper class to for HEX conversion.
24 *
25 * @author <a href="mailto:painter@apache.org">Jeffery Painter</a>
26 * @author <a href="mailto:siegfried.goeschl@it20one.at">Siegfried Goeschl</a>
27 * @author <a href="mailto:maakus@earthlink.net">Markus Hahn</a>
28 */
29
30 public final class HexConverter
31 {
32 /**
33 * Converts a byte array to a hex string.
34 *
35 * @param data the byte array
36 * @return the hex string
37 */
38 public static String toString( byte[] data )
39 {
40 return bytesToHexStr(data);
41 }
42
43 /**
44 * Converts a hex string into a byte[]
45 *
46 * @param sHex the hex string
47 * @return the byte[]
48 */
49 public static byte[] toBytes(String sHex) {
50 int len = sHex.length();
51 byte[] data = new byte[len / 2];
52 for (int i = 0; i < len; i += 2) {
53 data[i / 2] = (byte) ((Character.digit(sHex.charAt(i), 16) << 4)
54 + Character.digit(sHex.charAt(i+1), 16));
55 }
56 return data;
57 }
58
59 /**
60 * Converts a byte array to a hex string.
61 * @param data the byte array
62 * @return the hex string
63 */
64 private static String bytesToHexStr( byte[] data )
65 {
66 StringBuilder sbuf = new StringBuilder();
67 for ( byte b : data )
68 sbuf.append( String.format("%02x", b ) );
69 return sbuf.toString();
70 }
71
72 }