net.unmz.java.util.security.MD5Utils Maven / Gradle / Ivy
package net.unmz.java.util.security;
import org.apache.commons.codec.digest.DigestUtils;
import java.io.*;
import java.security.MessageDigest;
import java.security.SignatureException;
/**
* Project Name: 常用工具类集合
* 功能描述：MD5签名
*
* @author [email protected]
* @version 1.0
* @date 2017-12-12 11:14
* @since JDK 1.8
*/
public class MD5Utils {
private static final char hexChars[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
/**
* 32位MD5加密算法
* @param s
* @return
*/
public static String convert32(String s)
{
try {
byte[] bytes = s.getBytes();
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(bytes);
bytes = md.digest();
int j = bytes.length;
char[] chars = new char[j * 2];
int k = 0;
for (int i = 0; i < bytes.length; i++) {
byte b = bytes[i];
chars[k++] = hexChars[b >>> 4 & 0xf];
chars[k++] = hexChars[b & 0xf];
}
return new String(chars);
}
catch (Exception e){
return null;
}
}
/**
* 16位MD5加密算法
* @param s
* @return
*/
public static String convert16(String s)
{
try {
byte[] bytes = s.getBytes();
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(bytes);
bytes = md.digest();
int j = bytes.length;
char[] chars = new char[j * 2];
int k = 0;
for (int i = 0; i < bytes.length; i++) {
byte b = bytes[i];
chars[k++] = hexChars[b >>> 4 & 0x0f];
chars[k++] = hexChars[b & 0x0f];
}
return new String(chars).substring(8, 24);
}
catch (Exception e)
{
return null;
}
}
/**
* 获取文件的MD5值 32位
* @param file 文件
* @return 32位MD5值
*/
public static String convertFile32(File file)
{
if(file==null || !file.exists())
{
return null;
}
InputStream fis = null;
try {
fis = new FileInputStream(file);
byte[] buffer = new byte[1024];
MessageDigest md5 = MessageDigest.getInstance("MD5");
int numRead = 0;
while ((numRead = fis.read(buffer)) > 0)
{
md5.update(buffer, 0, numRead);
}
byte[] b=md5.digest();
StringBuilder sb = new StringBuilder(b.length * 2);
for (int i = 0; i < b.length; i++) {
sb.append(hexChars[(b[i] & 0xf0) >>> 4]);
sb.append(hexChars[b[i] & 0x0f]);
}
return sb.toString();
}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
if(fis!=null)
{
try
{
fis.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
return null;
}
/**
* 签名字符串
*
* @param text 需要签名的字符串
* @param key 密钥
* @param input_charset 编码格式
* @return 签名结果
*/
public static String sign(String text, String key, String input_charset) {
text = text + key;
return DigestUtils.md5Hex(getContentBytes(text, input_charset));
}
/**
* 签名字符串
*
* @param text 需要签名的字符串
* @param sign 签名结果
* @param key 密钥
* @param input_charset 编码格式
* @return 签名结果
*/
public static boolean verify(String text, String sign, String key, String input_charset) {
text = text + key;
String mysign = DigestUtils.md5Hex(getContentBytes(text, input_charset));
if (mysign.equals(sign)) {
return true;
} else {
return false;
}
}
/**
* @param content
* @param charset
* @return
* @throws SignatureException
* @throws UnsupportedEncodingException
*/
private static byte[] getContentBytes(String content, String charset) {
if (charset == null || "".equals(charset)) {
return content.getBytes();
}
try {
return content.getBytes(charset);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("MD5签名过程中出现错误,指定的编码集不对,您目前指定的编码集是:" + charset);
}
}
}