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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