org.camunda.bpm.engine.impl.digest.Base64EncodedHashDigest Maven / Gradle / Ivy
/*
* Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
* under one or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. Camunda licenses this file to you under the Apache License,
* Version 2.0; you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.camunda.bpm.engine.impl.digest;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.camunda.bpm.engine.ProcessEngineException;
import org.camunda.bpm.engine.impl.digest._apacheCommonsCodec.Base64;
/**
* @author Daniel Meyer
*
*/
public abstract class Base64EncodedHashDigest {
public String encrypt(String password) {
// create hash as byte array
byte[] hash = createByteHash(password);
// stringify hash (default implementation use BASE64 encoding)
return encodeHash(hash);
}
public boolean check(String password, String encrypted) {
return encrypt(password).equals(encrypted);
}
protected byte[] createByteHash(String password) {
MessageDigest digest = createDigestInstance();
try {
digest.update(password.getBytes("UTF-8"));
return digest.digest();
} catch (UnsupportedEncodingException e) {
throw new ProcessEngineException("UnsupportedEncodingException while calculating password digest");
}
}
protected MessageDigest createDigestInstance() {
try {
return MessageDigest.getInstance(hashAlgorithmName());
} catch (NoSuchAlgorithmException e) {
throw new ProcessEngineException("Cannot lookup " + hashAlgorithmName() + " algorithm");
}
}
protected String encodeHash(byte[] hash) {
return new String(Base64.encodeBase64(hash));
}
/** allows subclasses to select the hash algorithm */
protected abstract String hashAlgorithmName();
}