org.apache.tika.parser.utils.BouncyCastleDigester Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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
*
* 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.apache.tika.parser.utils;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import org.apache.commons.codec.binary.Base32;
import org.apache.tika.parser.DigestingParser;
import org.apache.tika.parser.digest.CompositeDigester;
import org.apache.tika.parser.digest.InputStreamDigester;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Hex;
/**
* Digester that relies on BouncyCastle for MessageDigest implementations.
*
*/
public class BouncyCastleDigester extends CompositeDigester {
/**
* Include a string representing the comma-separated algorithms to run: e.g. "md5,sha1".
* If you want base 32 encoding instead of hexadecimal, add ":32" to the algorithm, e.g. "md5,sha1:32"
*
* Will throw an IllegalArgumentException if an algorithm isn't supported
* @param markLimit
* @param algorithmString
*/
public BouncyCastleDigester(int markLimit, String algorithmString) {
super(buildDigesters(markLimit, algorithmString));
}
private static DigestingParser.Digester[] buildDigesters(int markLimit, String digesterDef) {
String[] digests = digesterDef.split(",");
DigestingParser.Digester[] digesters = new DigestingParser.Digester[digests.length];
int i = 0;
for (String digest : digests) {
String[] parts = digest.split(":");
DigestingParser.Encoder encoder = null;
if (parts.length > 1) {
if (parts[1].equals("16")) {
encoder = new HexEncoder();
} else if (parts[1].equals("32")) {
encoder = new Base32Encoder();
} else {
throw new IllegalArgumentException("Value must be '16' or '32'");
}
} else {
encoder = new HexEncoder();
}
digesters[i++] = new BCInputStreamDigester(markLimit, parts[0], encoder);
}
return digesters;
}
private static class HexEncoder implements DigestingParser.Encoder {
@Override
public String encode(byte[] bytes) {
return Hex.toHexString(bytes);
}
}
private static class Base32Encoder implements DigestingParser.Encoder {
@Override
public String encode(byte[] bytes) {
return new Base32().encodeToString(bytes);
}
}
private static class BCInputStreamDigester extends InputStreamDigester {
public BCInputStreamDigester(int markLimit, String algorithm, DigestingParser.Encoder encoder) {
super(markLimit, algorithm, encoder);
try {
MessageDigest.getInstance(algorithm, getProvider());
} catch (NoSuchAlgorithmException e) {
throw new IllegalArgumentException(e);
}
}
@Override
protected Provider getProvider() {
return new BouncyCastleProvider();
}
}
}