1 package net.sumaris.core.util.crypto;
2
3 /*
4 * #%L
5 * UCoin Java :: Core Shared
6 * %%
7 * Copyright (C) 2014 - 2016 EIS
8 * %%
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, either version 3 of the
12 * License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public
20 * License along with this program. If not, see
21 * <http://www.gnu.org/licenses/gpl-3.0.html>.
22 * #L%
23 */
24
25 import java.io.UnsupportedEncodingException;
26 import java.security.MessageDigest;
27 import java.security.NoSuchAlgorithmException;
28
29 /**
30 * Neither org.apache.commons.codec.digest.DigestUtils nor org.apache.commons.codec.binary.Hex
31 * take the ENCODING into account, they both use the system's default encoding which is wrong
32 * in a web environment.
33 * <p/>
34 * @see: https://github.com/MyMalcom/malcom-lib-android/blob/master/src/main/java/com/malcom/library/android/utils/DigestUtils.java
35 * @author Malcom Ventures, S.L.
36 * @since 2012
37 */
38 public class DigestUtils {
39 private static final char[] HEXITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
40 private static final String SHA1_ALGORITHM = "SHA1";
41 private static final String UTF_8 = "UTF-8";
42
43 /**
44 * Converts an array of bytes into an array of characters representing the hexidecimal values of each byte in order.
45 * The returned array will be double the length of the passed array, as it takes two characters to represent any
46 * given byte.
47 *
48 * @param data a byte[] to convert to Hex characters
49 * @return A char[] containing hexidecimal characters
50 * @see: http://stackoverflow.com/questions/332079/in-java-how-do-i-convert-a-byte-array-to-a-string-of-hex-digits-while-keeping-le
51 */
52 public static String encodeHex(byte[] data) {
53 char[] out = new char[data.length << 1]; // == new char[data.length * 2];
54 for (int i = 0, j = 0; i < data.length; i++) {
55 out[j++] = HEXITS[(0xF0 & data[i]) >>> 4]; // HEXITS[(data[i] & 0xFF) / 16];
56 out[j++] = HEXITS[0x0F & data[i]]; // HEXITS[(data[i] & 0xFF) % 16];
57 }
58 return new String(out);
59 }
60
61 /**
62 * Genera a SHA1 fingerprint from the given message
63 *
64 * @param message a message to encodeinto SHA-1
65 * @return a SHA1 fingerprint
66 */
67 public static String sha1Hex(String message) {
68 return sha1Hex(message, UTF_8);
69 }
70
71 public static String sha1Hex(String message, String encoding) {
72 try {
73 MessageDigest md = getSHA1Instance();
74 return encodeHex(md.digest(message.getBytes(encoding)));
75 } catch (UnsupportedEncodingException e) {
76 throw new RuntimeException(e);
77 }
78 }
79
80 public static MessageDigest getSHA1Instance() {
81 try {
82 return MessageDigest.getInstance(SHA1_ALGORITHM);
83 } catch (NoSuchAlgorithmException e) {
84 throw new RuntimeException(e);
85 }
86 }
87 }