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/*
* Artifactural
* Copyright (c) 2018-2021.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.minecraftforge.artifactural.base.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Locale;
//These are all standard hashing functions the JRE is REQUIRED to have, so add a nice factory that doesnt require catching annoying exceptions;
public enum HashFunction {
MD5("md5", 32),
SHA1("SHA-1", 40),
SHA256("SHA-256", 64);
private String algo;
private String pad;
private HashFunction(String algo, int length) {
this.algo = algo;
// must specify locale to get correct number formatting
this.pad = String.format(Locale.ENGLISH, "%0" + length + "d", 0);
}
public String getExtension() {
return this.name().toLowerCase(Locale.ENGLISH);
}
public Instance create() {
return new Instance();
}
public MessageDigest get() {
try {
return MessageDigest.getInstance(algo);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e); //Never happens
}
}
public String hash(File file) throws IOException {
try (FileInputStream fin = new FileInputStream(file)) {
return hash(fin);
}
}
public String hash(Iterable<File> files) throws IOException {
MessageDigest hash = get();
byte[] buf = new byte[1024];
for (File file : files) {
if (!file.exists())
continue;
try (FileInputStream fin = new FileInputStream(file)) {
int count = -1;
while ((count = fin.read(buf)) != -1)
hash.update(buf, 0, count);
}
}
return pad(new BigInteger(1, hash.digest()).toString(16));
}
public String hash(String data) {
return hash(data.getBytes(StandardCharsets.UTF_8));
}
public String hash(InputStream stream) throws IOException {
MessageDigest hash = get();
byte[] buf = new byte[1024];
int count = -1;
while ((count = stream.read(buf)) != -1)
hash.update(buf, 0, count);
return pad(new BigInteger(1, hash.digest()).toString(16));
}
public String hash(byte[] data) {
return pad(new BigInteger(1, get().digest(data)).toString(16));
}
public String pad(String hash) {
return (pad + hash).substring(hash.length());
}
public class Instance {
private MessageDigest digest = HashFunction.this.get();
public void update(byte input) {
digest.update(input);
}
public void update(byte[] input) {
digest.update(input);
}
public void update(byte[] input, int offset, int length) {
digest.update(input, offset, length);
}
public void update(ByteBuffer input) {
digest.update(input);
}
public void update(String input) {
update(input.getBytes(StandardCharsets.UTF_8));
}
public void update(int input) {
update(new byte[] { (byte)((input & 0xFF000000) >> 24), (byte)((input & 0xFF000000) >> 16), (byte)((input & 0xFF000000) >> 8), (byte)((input & 0xFF000000))});
}
public byte[] digest() {
return digest.digest();
}
public String finish() {
return pad(new BigInteger(1, digest()).toString(16));
}
}
}
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