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HMACSigner.java
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HMACSigner.java
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/*
* Copyright (c) 2016, Inversoft Inc., All Rights Reserved
*
* 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.primeframework.jwt.hmac;
import org.primeframework.jwt.Signer;
import org.primeframework.jwt.domain.Algorithm;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Objects;
/**
* This class can sign and verify a JWT that was signed using HMAC.
*
* @author Daniel DeGroff
*/
public class HMACSigner implements Signer {
private final Algorithm algorithm;
private byte[] secret;
private HMACSigner(Algorithm algorithm, String secret) {
this.algorithm = algorithm;
this.secret = secret.getBytes();
}
public static HMACSigner newSHA256Signer(String secret) {
return new HMACSigner(Algorithm.HS256, secret);
}
public static HMACSigner newSHA384Signer(String secret) {
return new HMACSigner(Algorithm.HS384, secret);
}
public static HMACSigner newSHA512Signer(String secret) {
return new HMACSigner(Algorithm.HS512, secret);
}
@Override
public Algorithm getAlgorithm() {
return algorithm;
}
@Override
public byte[] sign(String message) {
Objects.requireNonNull(algorithm);
Objects.requireNonNull(secret);
try {
Mac mac = Mac.getInstance(algorithm.getName());
mac.init(new SecretKeySpec(secret, algorithm.getName()));
return mac.doFinal(message.getBytes());
} catch (InvalidKeyException | NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
}
}