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Signing.java
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Signing.java
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/*
* Copyright (c) 2021 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.connectivity.service.messaging.signing;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import org.eclipse.ditto.connectivity.model.MessageSendingFailedException;
/**
* Functional interface for signing a request before sending it.
*/
public interface Signing {
/**
* Compute HMAC using SHA256 hash function.
*
* @param key the key.
* @param input the message.
* @return the HMAC.
*/
static byte[] hmacSha256(final byte[] key, final String input) {
try {
final String hmacSha256 = "HmacSHA256";
final Mac mac = Mac.getInstance(hmacSha256);
mac.init(new SecretKeySpec(key, hmacSha256));
return mac.doFinal(input.getBytes(StandardCharsets.UTF_8));
} catch (final NoSuchAlgorithmException | InvalidKeyException e) {
throw MessageSendingFailedException.newBuilder()
.message("Failed to create a HMAC-SHA256 signature.")
.cause(e)
.build();
}
}
}