/*
* Licensed to Jasig under one or more contributor license
* agreements. See the NOTICE file distributed with this work
* for additional information regarding copyright ownership.
* Jasig licenses this file to you under the Apache License,
* Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a
* copy of the License at the following location:
*
* 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.jasig.cas.authentication.handler;
import org.springframework.util.StringUtils;
import javax.validation.constraints.NotNull;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Implementation of PasswordEncoder using message digest. Can accept any
* message digest that the JDK can accept, including MD5 and SHA1. Returns the
* equivalent Hash you would get from a Perl digest.
*
* @author Scott Battaglia
* @author Stephen More
* @since 3.1
*/
public final class DefaultPasswordEncoder implements PasswordEncoder {
private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8',
'9', 'a', 'b', 'c', 'd', 'e', 'f'};
@NotNull
private final String encodingAlgorithm;
private String characterEncoding;
public DefaultPasswordEncoder(final String encodingAlgorithm) {
this.encodingAlgorithm = encodingAlgorithm;
}
public String encode(final String password) {
if (password == null) {
return null;
}
try {
MessageDigest messageDigest = MessageDigest
.getInstance(this.encodingAlgorithm);
if (StringUtils.hasText(this.characterEncoding)) {
messageDigest.update(password.getBytes(this.characterEncoding));
} else {
messageDigest.update(password.getBytes());
}
final byte[] digest = messageDigest.digest();
return getFormattedText(digest);
} catch (final NoSuchAlgorithmException e) {
throw new SecurityException(e);
} catch (final UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
/**
* Takes the raw bytes from the digest and formats them correct.
*
* @param bytes the raw bytes from the digest.
* @return the formatted bytes.
*/
private String getFormattedText(final byte[] bytes) {
final StringBuilder buf = new StringBuilder(bytes.length * 2);
for (int j = 0; j < bytes.length; j++) {
buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);
buf.append(HEX_DIGITS[bytes[j] & 0x0f]);
}
return buf.toString();
}
public void setCharacterEncoding(final String characterEncoding) {
this.characterEncoding = characterEncoding;
}
}