com.alibaba.nacos.common.utils.MD5Utils Maven / Gradle / Ivy
/*
* Copyright 1999-2018 Alibaba Group Holding Ltd.
*
* 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.alibaba.nacos.common.utils;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* MD5 util.
*
* @author nacos
*/
@SuppressWarnings("PMD.ClassNamingShouldBeCamelRule")
public class MD5Utils {
private MD5Utils() {
}
private static final char[] DIGITS_LOWER = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
'e', 'f'};
private static final ThreadLocal MESSAGE_DIGEST_LOCAL = ThreadLocal.withInitial(() -> {
try {
return MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
return null;
}
});
/**
* Calculate MD5 hex string.
*
* @param bytes byte arrays
* @return MD5 hex string of input
* @throws NoSuchAlgorithmException if can't load md5 digest spi.
*/
public static String md5Hex(byte[] bytes) throws NoSuchAlgorithmException {
try {
MessageDigest messageDigest = MESSAGE_DIGEST_LOCAL.get();
if (messageDigest != null) {
return encodeHexString(messageDigest.digest(bytes));
}
throw new NoSuchAlgorithmException("MessageDigest get MD5 instance error");
} finally {
MESSAGE_DIGEST_LOCAL.remove();
}
}
/**
* Calculate MD5 hex string with encode charset.
*
* @param value value
* @param encode encode charset of input
* @return MD5 hex string of input
*/
public static String md5Hex(String value, String encode) {
try {
return md5Hex(value.getBytes(encode));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Convert a byte array into a visible string.
*/
public static String encodeHexString(byte[] bytes) {
int l = bytes.length;
char[] out = new char[l << 1];
for (int i = 0, j = 0; i < l; i++) {
out[j++] = DIGITS_LOWER[(0xF0 & bytes[i]) >>> 4];
out[j++] = DIGITS_LOWER[0x0F & bytes[i]];
}
return new String(out);
}
}