org.jose4j.lang.HashUtil Maven / Gradle / Ivy
/*
* Copyright 2012-2017 Brian Campbell
*
* 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 org.jose4j.lang;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
/**
*
*/
public class HashUtil
{
public static final String SHA_256 = "SHA-256";
public static MessageDigest getMessageDigest(String alg)
{
return getMessageDigest(alg, null);
}
public static MessageDigest getMessageDigest(String alg, String provider)
{
try
{
return provider == null ? MessageDigest.getInstance(alg) : MessageDigest.getInstance(alg, provider);
}
catch (NoSuchAlgorithmException e)
{
throw new UncheckedJoseException("Unable to get MessageDigest instance with " + alg);
}
catch (NoSuchProviderException e)
{
throw new UncheckedJoseException("Unable to get a MessageDigest implementation of algorithm name: " + alg + " using provider " + provider, e);
}
}
}