io.jsonwebtoken.impl.crypto.RsaSignatureValidator Maven / Gradle / Ivy
/*
* Copyright (C) 2014 jsonwebtoken.io
*
* 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 io.jsonwebtoken.impl.crypto;
import io.jsonwebtoken.SignatureAlgorithm;
import io.jsonwebtoken.lang.Assert;
import io.jsonwebtoken.security.SignatureException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.MessageDigest;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.util.Arrays;
public class RsaSignatureValidator extends RsaProvider implements SignatureValidator {
private final RsaSigner SIGNER;
public RsaSignatureValidator(SignatureAlgorithm alg, Key key) {
super(alg, key);
Assert.isTrue(key instanceof RSAPrivateKey || key instanceof RSAPublicKey,
"RSA Signature validation requires either a RSAPublicKey or RSAPrivateKey instance.");
this.SIGNER = key instanceof RSAPrivateKey ? new RsaSigner(alg, key) : null;
}
@Override
public boolean isValid(byte[] data, byte[] signature) {
if (key instanceof PublicKey) {
Signature sig = createSignatureInstance();
PublicKey publicKey = (PublicKey) key;
try {
return doVerify(sig, publicKey, data, signature);
} catch (Exception e) {
String msg = "Unable to verify RSA signature using configured PublicKey. " + e.getMessage();
throw new SignatureException(msg, e);
}
} else {
Assert.notNull(this.SIGNER, "RSA Signer instance cannot be null. This is a bug. Please report it.");
byte[] computed = this.SIGNER.sign(data);
return MessageDigest.isEqual(computed, signature);
}
}
protected boolean doVerify(Signature sig, PublicKey publicKey, byte[] data, byte[] signature)
throws InvalidKeyException, java.security.SignatureException {
sig.initVerify(publicKey);
sig.update(data);
return sig.verify(signature);
}
}