/*
* Copyright 2015 Kevin Herron
*
* 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.digitalpetri.opcua.stack.core.util;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import com.digitalpetri.opcua.stack.core.StatusCodes;
import com.digitalpetri.opcua.stack.core.UaRuntimeException;
public class DigestUtil {
private static final ThreadLocal<MessageDigest> sha1Digest = new ThreadLocal<>();
/**
* Compute the SHA1 digest for a given input.
*
* @param input the input to compute the digest for.
* @return the SHA1 digest of {@code input}.
*/
public static byte[] sha1(byte[] input) {
MessageDigest messageDigest = sha1Digest.get();
if (messageDigest == null) {
try {
messageDigest = MessageDigest.getInstance("SHA1");
sha1Digest.set(messageDigest);
} catch (NoSuchAlgorithmException e) {
throw new UaRuntimeException(StatusCodes.Bad_InternalError, e);
}
}
return messageDigest.digest(input);
}
}