org.jboss.pnc.common.security.CheckSum Maven / Gradle / Ivy
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* JBoss, Home of Professional Open Source.
* Copyright 2014-2022 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.jboss.pnc.common.security;
import java.io.IOException;
import java.io.StringReader;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* @deprecated use pnc-common lib
* @author Matej Lazar
*/
@Deprecated
public class CheckSum {
static String calculateDigest(String message, String algorithm) throws NoSuchAlgorithmException, IOException {
MessageDigest md = MessageDigest.getInstance(algorithm);
StringReader reader = new StringReader(message);
char[] buffer = new char[1024];
while (true) {
int read = reader.read(buffer);
if (read == -1) {
break;
}
md.update(String.valueOf(buffer, 0, read).getBytes(StandardCharsets.UTF_8));
}
byte[] digest = md.digest();
return format(digest);
}
static String format(byte[] digest) {
StringBuilder hexString = new StringBuilder();
for (byte b : digest) {
String hex = Integer.toHexString(0xFF & b);
if (hex.length() == 1) {
hexString.append('0');
}
hexString.append(hex);
}
return hexString.toString();
}
}