<?php

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

class ShaHmac256Signer implements ISigner
{
    /**
     * @param $source
     * @param $accessSecret
     *
     * @return string
     */
    public function signString($source, $accessSecret)
    {
        return base64_encode(hash_hmac('sha256', $source, $accessSecret, true));
    }

    /**
     * @return string
     */
    public function getSignatureMethod()
    {
        return 'HMAC-SHA256';
    }

    /**
     * @return string
     */
    public function getSignatureVersion()
    {
        return '1.0';
    }

    /**
     * @return null
     */
    public function getSignatureType()
    {
        return null;
    }
}
