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HmacCookieValueSigner.java
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HmacCookieValueSigner.java
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/*
* Copyright 2018-2021 innoQ Deutschland GmbH
*
* 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 com.innoq.spring.cookie.security;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import static java.nio.charset.StandardCharsets.UTF_8;
final class HmacCookieValueSigner implements CookieValueSigner {
private final String algorithm;
private final byte[] secret;
HmacCookieValueSigner(String algorithm, byte[] secret) {
this.algorithm = algorithm;
this.secret = secret;
}
@Override
public String sign(String payload) {
try {
final byte[] data = payload.getBytes(UTF_8);
final Key key = new SecretKeySpec(secret, algorithm);
final Mac mac = Mac.getInstance(algorithm);
mac.init(key);
final byte[] result = mac.doFinal(data);
return bytesToHex(result);
} catch (NoSuchAlgorithmException | InvalidKeyException e) {
// TODO: use own exception?
throw new IllegalStateException("Unable to sign payload", e);
}
}
private static String bytesToHex(byte[] bytes) {
final StringBuilder hex = new StringBuilder();
for (byte b : bytes) {
hex.append(byteToHex(b));
}
return hex.toString();
}
private static String byteToHex(byte b) {
return Integer.toString((b & 0xff) + 0x100, 16).substring(1);
}
}