1 /*
2 * Copyright (c) 2002-2014, Mairie de Paris
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright notice
10 * and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright notice
13 * and the following disclaimer in the documentation and/or other materials
14 * provided with the distribution.
15 *
16 * 3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 *
32 * License 1.0
33 */
34 package fr.paris.lutece.portal.service.util;
35
36 import java.io.UnsupportedEncodingException;
37
38 import java.security.MessageDigest;
39 import java.security.NoSuchAlgorithmException;
40
41
42 /**
43 * The Class CryptoService.
44 */
45 public final class CryptoService
46 {
47 // Properties
48 private static final String PROPERTY_ENCODING = "lutece.encoding";
49 private static final String PROPERTY_CRYPTO_KEY = "crypto.key";
50
51 /**
52 * Private constructor
53 */
54 private CryptoService( )
55 {
56 }
57
58 /**
59 * Encrypt a data using an algorithm defined in lutece.properties
60 * @param strDataToEncrypt The data to encrypt
61 * @param strAlgorithm the algorithm
62 * @return The encrypted string
63 */
64 public static String encrypt( String strDataToEncrypt, String strAlgorithm )
65 {
66 String hash = null;
67 MessageDigest md = null;
68
69 try
70 {
71 md = MessageDigest.getInstance( strAlgorithm );
72 }
73 catch ( NoSuchAlgorithmException e )
74 {
75 AppLogService.error( e.getMessage( ), e );
76 }
77
78 try
79 {
80 hash = byteToHex( md.digest( strDataToEncrypt.getBytes( AppPropertiesService.getProperty( PROPERTY_ENCODING ) ) ) );
81 }
82 catch ( UnsupportedEncodingException e )
83 {
84 AppLogService.error( e.getMessage( ), e );
85 }
86
87 return hash;
88 }
89
90 /**
91 * Get the cryptographic key of the application
92 * @return The cryptographic key of the application
93 */
94 public static String getCryptoKey( )
95 {
96 return AppPropertiesService.getProperty( PROPERTY_CRYPTO_KEY );
97 }
98
99 /**
100 * Convert byte to hex
101 * @param bits the byte to convert
102 * @return the hex
103 */
104 private static String byteToHex( byte[] bits )
105 {
106 if ( bits == null )
107 {
108 return null;
109 }
110
111 // encod(1_bit) => 2 digits
112 StringBuffer hex = new StringBuffer( bits.length * 2 );
113
114 for ( int i = 0; i < bits.length; i++ )
115 {
116 if ( ( (int) bits[i] & 0xff ) < 0x10 )
117 {
118 // 0 < .. < 9
119 hex.append( "0" );
120 }
121
122 // [(bit+256)%256]^16
123 hex.append( Integer.toString( (int) bits[i] & 0xff, 16 ) );
124 }
125
126 return hex.toString( );
127 }
128 }