【实用】MD5加密工具类及加密过程详解
程序员文章站
2022-03-14 19:47:20
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md5加密在日常项目中使用较普遍了,
下面我也来分享一个我在项目使用的一个MD5加密工具类,觉得不错的同学帮忙评论或点赞
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
/**
* md5加密工具类
* @author Lenovo
*
*/
public class MD5Utils {
/**
* 对字符串进行加密
* @param text
* @return
*/
public static String md5Encode(String inStr) throws Exception {
MessageDigest md5 = null;
try {
md5 = MessageDigest.getInstance("MD5");
} catch (Exception e) {
System.out.println(e.toString());
e.printStackTrace();
return "";
}
byte[] byteArray = inStr.getBytes("UTF-8");
byte[] md5Bytes = md5.digest(byteArray);
StringBuffer hexValue = new StringBuffer();
for (int i = 0; i < md5Bytes.length; i++) {
int val = ((int) md5Bytes[i]) & 0xff;
if (val < 16) {
hexValue.append("0");
}
hexValue.append(Integer.toHexString(val));
}
return hexValue.toString();
}
public static String string2MD5(String inStr) {
MessageDigest md5 = null;
try {
md5 = MessageDigest.getInstance("MD5");
} catch (Exception e) {
System.out.println(e.toString());
e.printStackTrace();
return "";
}
char[] charArray = inStr.toCharArray();
byte[] byteArray = new byte[charArray.length];
for (int i = 0; i < charArray.length; i++)
byteArray[i] = (byte) charArray[i];
byte[] md5Bytes = md5.digest(byteArray);
StringBuffer hexValue = new StringBuffer();
for (int i = 0; i < md5Bytes.length; i++) {
int val = ((int) md5Bytes[i]) & 0xff;
if (val < 16)
hexValue.append("0");
hexValue.append(Integer.toHexString(val));
}
return hexValue.toString();
}
/**
* 加密解密算法 执行一次加密,两次解密
*/
public static String convertMD5(String inStr) {
char[] a = inStr.toCharArray();
for (int i = 0; i < a.length; i++) {
a[i] = (char) (a[i] ^ 't');
}
String s = new String(a);
return s;
}
public static String md5Decode(String str) {
return convertMD5(convertMD5(str));
}
// 测试主函数
public static void main(String args[]) throws UnsupportedEncodingException {
String s = new String("哈哈呵呵呵哈哈嘿嘿嘿哈111122356");
System.out.println(md5Decode("a6aeb3ffa55fc7d664406af9c3bd0f1b"));
System.out.println("原始:" + s);
System.out.println("MD5后:" + string2MD5(s));
System.out.println("MD5解密:" +md5Decode(string2MD5(s)));
System.out.println("加密的:" + convertMD5(s));
System.out.println("解密的:" + convertMD5(convertMD5(new String(s.getBytes(),"UTF-8"))));
}
}