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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
* Copyright © 2017-2018 Amdocs
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.crud.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Generates a sha 256 hash
*/
public class HashGenerator {
private MessageDigest messageDigest;
public HashGenerator() throws NoSuchAlgorithmException {
this.messageDigest = MessageDigest.getInstance("SHA-256");
}
/**
* Generates a SHA 256 hash as a hexadecimal string for the inputs. Calls toString on the input
* objects to convert into a byte stream.
*
* @param values
* @return SHA 256 hash of the inputs as a hexadecimal string.
* @throws IOException
*/
public String generateSHA256AsHex(Object... values) throws IOException {
byte[] bytes = convertToBytes(values);
byte[] digest = messageDigest.digest(bytes);
StringBuilder result = new StringBuilder();
for (byte byt : digest) {
result.append(Integer.toString((byt & 0xff) + 0x100, 16).substring(1));
}
return result.toString();
}
private byte[] convertToBytes(Object... values) throws IOException {
try (ByteArrayOutputStream bos = new ByteArrayOutputStream(); ObjectOutput out = new ObjectOutputStream(bos)) {
for (Object object : values) {
out.writeObject(object.toString());
}
return bos.toByteArray();
}
}
}
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