[3952] | 1 | package nu.fw.jeti.applet; |
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| 2 | |
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| 3 | import javax.crypto.Cipher; |
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| 4 | import javax.crypto.NoSuchPaddingException; |
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| 5 | import javax.crypto.spec.IvParameterSpec; |
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| 6 | import javax.crypto.spec.SecretKeySpec; |
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| 7 | |
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| 8 | /* |
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| 9 | * @author Serge Rehem |
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| 10 | * Jeti, a Java Jabber client, Copyright (C) 2003 E.S. de Boer |
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| 11 | * |
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| 12 | * This program is free software; you can redistribute it and/or modify |
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| 13 | * it under the terms of the GNU General Public License as published by |
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| 14 | * the Free Software Foundation; either version 2 of the License, or |
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| 15 | * (at your option) any later version. |
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| 16 | * |
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| 17 | * This program is distributed in the hope that it will be useful, |
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| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 20 | * GNU General Public License for more details. |
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| 21 | * |
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| 22 | * You should have received a copy of the GNU General Public License |
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| 23 | * along with this program; if not, write to the Free Software |
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| 24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 25 | * |
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| 26 | * For questions, comments etc, |
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| 27 | * use the website at http://jeti.jabberstudio.org |
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| 28 | * or jabber/mail me at jeti@jabber.org |
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| 29 | * |
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| 30 | * Created on 14-nov-2003 |
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| 31 | */ |
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| 32 | |
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| 33 | /* |
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| 34 | * This code is based on AES Interop Between PHP and Java (Part 1) post at |
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| 35 | * http://propaso.com/blog/?cat=6 |
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| 36 | */ |
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| 37 | public class Crypto { |
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| 38 | |
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| 39 | public static String decrypt(String cryptedPasswd, String secretKey) { |
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| 40 | Cipher cipher; |
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| 41 | try { |
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| 42 | cipher = Cipher.getInstance("AES/CBC/NoPadding"); |
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| 43 | SecretKeySpec keySpec = new SecretKeySpec(secretKey.getBytes(), "AES"); |
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| 44 | |
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| 45 | IvParameterSpec ivSpec = new IvParameterSpec("@4321avaJtluafeD".getBytes()); |
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| 46 | |
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| 47 | cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec); |
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| 48 | byte[] outText = cipher.doFinal(hexToBytes(cryptedPasswd)); |
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| 49 | return new String(outText).trim(); |
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| 50 | } catch (Exception e) { |
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| 51 | e.printStackTrace(); |
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| 52 | return null; |
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| 53 | } |
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| 54 | } |
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| 55 | |
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| 56 | private static byte[] hexToBytes(String str) { |
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| 57 | if (str == null) { |
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| 58 | return null; |
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| 59 | } else if (str.length() < 2) { |
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| 60 | return null; |
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| 61 | } else { |
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| 62 | int len = str.length() / 2; |
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| 63 | byte[] buffer = new byte[len]; |
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| 64 | for (int i = 0; i < len; i++) { |
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| 65 | buffer[i] = (byte) Integer.parseInt(str.substring(i * 2, |
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| 66 | i * 2 + 2), 16); |
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| 67 | } |
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| 68 | return buffer; |
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| 69 | } |
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| 70 | } |
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| 71 | } |
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