001/* 002 * Sonar, open source software quality management tool. 003 * Copyright (C) 2008-2012 SonarSource 004 * mailto:contact AT sonarsource DOT com 005 * 006 * Sonar is free software; you can redistribute it and/or 007 * modify it under the terms of the GNU Lesser General Public 008 * License as published by the Free Software Foundation; either 009 * version 3 of the License, or (at your option) any later version. 010 * 011 * Sonar is distributed in the hope that it will be useful, 012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 * Lesser General Public License for more details. 015 * 016 * You should have received a copy of the GNU Lesser General Public 017 * License along with Sonar; if not, write to the Free Software 018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02 019 */ 020package org.sonar.api.config; 021 022import com.google.common.collect.ImmutableMap; 023 024import java.util.Locale; 025import java.util.Map; 026import java.util.regex.Matcher; 027import java.util.regex.Pattern; 028 029/** 030 * @since 3.0 031 */ 032public final class Encryption { 033 034 private static final String BASE64_ALGORITHM = "b64"; 035 036 private static final String AES_ALGORITHM = "aes"; 037 private final AesCipher aesCipher; 038 039 private final Map<String, Cipher> ciphers; 040 private static final Pattern ENCRYPTED_PATTERN = Pattern.compile("\\{(.*?)\\}(.*)"); 041 042 Encryption(Settings settings) { 043 aesCipher = new AesCipher(settings); 044 ciphers = ImmutableMap.of( 045 BASE64_ALGORITHM, new Base64Cipher(), 046 AES_ALGORITHM, aesCipher 047 ); 048 } 049 050 /** 051 * Checks the availability of the secret key, that is required to encrypt and decrypt. 052 */ 053 public boolean hasSecretKey() { 054 return aesCipher.hasSecretKey(); 055 } 056 057 public boolean isEncrypted(String value) { 058 return value.indexOf('{')==0 && value.indexOf('}') > 1; 059 } 060 061 public String encrypt(String clearText) { 062 return encrypt(AES_ALGORITHM, clearText); 063 } 064 065 public String scramble(String clearText) { 066 return encrypt(BASE64_ALGORITHM, clearText); 067 } 068 069 public String generateRandomSecretKey() { 070 return aesCipher.generateRandomSecretKey(); 071 } 072 073 public String decrypt(String encryptedText) { 074 Matcher matcher = ENCRYPTED_PATTERN.matcher(encryptedText); 075 if (matcher.matches()) { 076 Cipher cipher = ciphers.get(matcher.group(1).toLowerCase(Locale.ENGLISH)); 077 if (cipher != null) { 078 return cipher.decrypt(matcher.group(2)); 079 } 080 } 081 return encryptedText; 082 } 083 084 private String encrypt(String algorithm, String clearText) { 085 Cipher cipher = ciphers.get(algorithm); 086 if (cipher == null) { 087 throw new IllegalArgumentException("Unknown cipher algorithm: " + algorithm); 088 } 089 return String.format("{%s}%s", algorithm, cipher.encrypt(clearText)); 090 } 091}