93 lines
2.7 KiB
Java
93 lines
2.7 KiB
Java
/*
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* Copyright (c) 2010
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*
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* Robert von Burg
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* eitch@eitchnet.ch
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*
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* All rights reserved.
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*
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*/
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package ch.eitchnet.privilege.handler;
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import java.io.UnsupportedEncodingException;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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import java.util.Map;
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import org.apache.log4j.Logger;
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import org.dom4j.Element;
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import ch.eitchnet.privilege.base.XmlConstants;
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import ch.eitchnet.privilege.helper.ConfigurationHelper;
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import ch.eitchnet.privilege.helper.EncryptionHelper;
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import ch.eitchnet.privilege.i18n.PrivilegeException;
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/**
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* @author rvonburg
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*
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*/
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public class DefaultEncryptionHandler implements EncryptionHandler {
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private static final Logger logger = Logger.getLogger(DefaultEncryptionHandler.class);
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private SecureRandom secureRandom;
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private String hashAlgorithm;
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/**
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* @see ch.eitchnet.privilege.handler.EncryptionHandler#convertToHash(java.lang.String)
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*/
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@Override
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public String convertToHash(String string) {
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try {
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return EncryptionHelper.encryptString(hashAlgorithm, string);
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} catch (NoSuchAlgorithmException e) {
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throw new PrivilegeException("Algorithm " + hashAlgorithm + " was not found!", e);
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} catch (UnsupportedEncodingException e) {
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throw new PrivilegeException("Charset ASCII is not supported!", e);
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}
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}
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/**
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* @see ch.eitchnet.privilege.handler.EncryptionHandler#nextToken()
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*/
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@Override
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public String nextToken() {
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byte[] bytes = new byte[16];
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secureRandom.nextBytes(bytes);
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String randomString = new String(bytes);
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//String randomString = new BigInteger(80, secureRandom).toString(32); // 80 big integer bits = 16 chars
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return randomString;
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}
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/**
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* @see ch.eitchnet.privilege.base.PrivilegeContainerObject#initialize(org.dom4j.Element)
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*/
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public void initialize(Element element) {
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secureRandom = new SecureRandom();
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// get parameters
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Element parameterElement = element.element(XmlConstants.XML_PARAMETERS);
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Map<String, String> parameterMap = ConfigurationHelper.convertToParameterMap(parameterElement);
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// get hash algorithm parameters
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hashAlgorithm = parameterMap.get(XmlConstants.XML_PARAM_HASH_ALGORITHM);
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if (hashAlgorithm == null || hashAlgorithm.isEmpty()) {
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throw new PrivilegeException("[" + EncryptionHandler.class.getName() + "] Defined parameter "
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+ XmlConstants.XML_PARAM_HASH_ALGORITHM + " is invalid");
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}
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// test hash algorithm
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try {
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convertToHash("test");
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logger.info("Using hashing algorithm " + hashAlgorithm);
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} catch (Exception e) {
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throw new PrivilegeException("[" + EncryptionHandler.class.getName() + "] Defined parameter "
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+ XmlConstants.XML_PARAM_HASH_ALGORITHM + " is invalid because of underlying exception: "
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+ e.getLocalizedMessage(), e);
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}
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}
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}
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