Simple MD5 Encryption Class (Md5utils) in Java

MD5 Encryption Analysis: JDK API: Get Object API: Encrypted API:

1  Packagecn.utils;2 3 Importjava.security.MessageDigest;4 Importjava.security.NoSuchAlgorithmException;5 6 /**7  * @authorCQY13 MD5 Encryption Tool class8  */9  Public classMd5utils {Ten  One     /** A * Get MD5 encryption -      *  -      * @parampwd the * strings that need to be encrypted -      * @returnstring string after strings are encrypted -      */ -      Public Staticstring Getpwd (string pwd) { +         Try { -             //Create a Cryptographic object +MessageDigest digest = messagedigest.getinstance ("MD5"); A  at             //method of invoking the cryptographic object, the encrypted action has been completed -             byte[] bs =digest.digest (Pwd.getbytes ()); -             //Next, we will optimize the results after encryption and follow the MySQL optimization approach . -             //MySQL's optimization ideas: -             //The first step is to convert all the data into positive numbers: -String hexstring = ""; in              for(byteb:bs) { -                 //The first step is to convert all the data into positive numbers: to                 //Explanation: Why use b&255 +                 /* - * B: It would have been a byte type of data (1 bytes) 255: is an int type of data (4 bytes) the * Byte type data is operated with data of type int, automatic type promotion to int type eg:b: 1001 1100 (raw data) * * operation: b:0000 0000 0000 0000 0000 0000 1001 1100 255:0000 $ * 0000 0000 0000 0000 0000 1111 1111 results: 0000 0000 0000 0000Panax Notoginseng * 0000 0000 1001 1100 The temp at this time is an integer of type int -                  */ the                 inttemp = B & 255; +                 //The second step is to convert all the data into a 16 binary form A                 //Note: When converting, note if positive >=0&&<16, then if you use Integer.tohexstring (), it may cause a missing bit number the                 //Therefore, the temp needs to be judged +                 if(Temp < && temp >= 0) { -                     //manually fill in a "0" $hexstring = hexstring + "0" +integer.tohexstring (temp); $}Else { -hexstring = hexstring +integer.tohexstring (temp); -                 } the             } -             returnhexstring;Wuyi}Catch(nosuchalgorithmexception e) { the             //TODO auto-generated Catch block - e.printstacktrace (); Wu         } -         return""; About     } $  -     /** -      * @paramargs -      */ A      Public Static voidMain (string[] args) { +String pwd = md5utils.getpwd ("abc"); the System.out.println (PWD); -     } $  the}

Simple MD5 Encryption Class (Md5utils) in Java