com.wl4g.infra.common.codec.FingerprintUtils Maven / Gradle / Ivy
/*
* Copyright 2017 ~ 2025 the original author or authors. James Wong
*
* 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.wl4g.infra.common.codec;
import java.io.File;
import java.io.FileInputStream;
import java.math.BigInteger;
import java.security.MessageDigest;
/**
* File Fingerprint codec utility tools.
*
* @author James Wong James Wong
* @author vjay
* @date 2019-07-19 17:16:00
*/
public abstract class FingerprintUtils {
/** Reader buffer size. */
final public static int READ_BUF_SIZE = 1024 * 8;
/**
* Read the file and calculate the binary SHA1 fingerprint.
*
* @param file
* @return SHA1 string of file.
*/
public static String getSha1Fingerprint(File file) {
try (FileInputStream in = new FileInputStream(file);) {
MessageDigest digest = MessageDigest.getInstance("SHA-1");
byte[] buf = new byte[READ_BUF_SIZE];
int len = 0;
while ((len = in.read(buf)) > 0) {
digest.update(buf, 0, len);
}
String sha1 = new BigInteger(1, digest.digest()).toString(16);
int length = 40 - sha1.length();
if (length > 0) {
for (int i = 0; i < length; i++) {
sha1 = "0" + sha1;
}
}
return sha1;
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
/**
* Read the file and calculate the binary MD5 fingerprint.
*
* @param file
* @return md5 string of file.
*/
public static String getMd5Fingerprint(File file) {
try (FileInputStream in = new FileInputStream(file);) {
MessageDigest digest = MessageDigest.getInstance("MD5");
byte[] buf = new byte[READ_BUF_SIZE];
int len = 0;
while ((len = in.read(buf)) > 0) {
digest.update(buf, 0, len);
}
String md5 = new BigInteger(1, digest.digest()).toString(16);
int length = 32 - md5.length();
if (length > 0) {
for (int i = 0; i < length; i++) {
md5 = "0" + md5;
}
}
return md5;
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
}