/*
* Copyright 2012-2014 Brian Campbell
*
* Licensed 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.jose4j.jws;
import org.jose4j.jwa.AlgorithmInfo;
import org.jose4j.jwx.HeaderParameterNames;
import org.jose4j.keys.KeyPersuasion;
import org.jose4j.lang.ByteUtil;
import org.jose4j.lang.InvalidKeyException;
import org.jose4j.lang.JoseException;
import java.security.Key;
/**
* TODO as of http://tools.ietf.org/html/draft-ietf-jose-json-web-signature-32 the term Plaintext JWS was replace with Unsecured JWS and I'd like to change the name here to match but worry (a little) about compatibility
*/
public class PlaintextNoneAlgorithm extends AlgorithmInfo implements JsonWebSignatureAlgorithm
{
private static final String CANNOT_HAVE_KEY_MESSAGE = "JWS Plaintext ("+ HeaderParameterNames.ALGORITHM+"="+ AlgorithmIdentifiers.NONE+") must not use a key.";
public PlaintextNoneAlgorithm()
{
setAlgorithmIdentifier(AlgorithmIdentifiers.NONE);
setKeyPersuasion(KeyPersuasion.NONE);
}
public boolean verifySignature(byte[] signatureBytes, Key key, byte[] securedInputBytes) throws JoseException
{
validateKey(key);
return (signatureBytes.length == 0);
}
public byte[] sign(Key key, byte[] securedInputBytes) throws JoseException
{
validateKey(key);
return ByteUtil.EMPTY_BYTES;
}
public void validateSigningKey(Key key) throws InvalidKeyException
{
validateKey(key);
}
public void validateVerificationKey(Key key) throws InvalidKeyException
{
validateKey(key);
}
private void validateKey(Key key) throws InvalidKeyException
{
if (key != null)
{
throw new InvalidKeyException(CANNOT_HAVE_KEY_MESSAGE);
}
}
@Override
public boolean isAvailable()
{
return true;
}
}