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/*
 * Copyright 2011-2023 GatlingCorp (https://gatling.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.
 */

//
// Copyright (c) 2018 AsyncHttpClient Project. All rights reserved.
//
// This program is licensed to you under the Apache License Version 2.0,
// and you may not use this file except in compliance with the Apache License Version 2.0.
// You may obtain a copy of the Apache License Version 2.0 at
//     http://www.apache.org/licenses/LICENSE-2.0.
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the Apache License Version 2.0 is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the Apache License Version 2.0 for the specific language governing permissions and
// limitations there under.
//

package io.gatling.http.client.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public final class MessageDigestUtils {

  private MessageDigestUtils() {}

  private static final ThreadLocal MD5_MESSAGE_DIGESTS =
      ThreadLocal.withInitial(
          () -> {
            try {
              return MessageDigest.getInstance("MD5");
            } catch (NoSuchAlgorithmException e) {
              throw new InternalError("MD5 not supported on this platform");
            }
          });

  private static final ThreadLocal SHA1_MESSAGE_DIGESTS =
      ThreadLocal.withInitial(
          () -> {
            try {
              return MessageDigest.getInstance("SHA1");
            } catch (NoSuchAlgorithmException e) {
              throw new InternalError("SHA1 not supported on this platform");
            }
          });

  public static MessageDigest pooledMd5MessageDigest() {
    MessageDigest md = MD5_MESSAGE_DIGESTS.get();
    md.reset();
    return md;
  }

  public static MessageDigest pooledSha1MessageDigest() {
    MessageDigest md = SHA1_MESSAGE_DIGESTS.get();
    md.reset();
    return md;
  }
}