Java-des algorithm encryption and Decryption tool class

ImportJava.io.FileInputStream;ImportJava.io.FileOutputStream;ImportJava.io.InputStream;ImportJava.io.OutputStream;ImportJava.security.Key;ImportJava.security.SecureRandom;ImportJavax.crypto.Cipher;ImportJavax.crypto.CipherInputStream;ImportJavax.crypto.CipherOutputStream;ImportJavax.crypto.KeyGenerator;ImportSun.misc.BASE64Decoder;ImportSun.misc.BASE64Encoder; Public classdesutil {key key;  PublicDesutil () {} Publicdesutil (String str) {setkey (str);//Generate key    }      PublicKey GetKey () {returnkey; }      Public voidSetkey (key key) { This. Key =key; } //    /**//* Generate key based on parameters//      *///Public void Setkey (String strkey) {//try {//keygenerator _generator = keygenerator.getinstance ("DES");//_generator.init (New SecureRandom (Strkey.getbytes ()));//This . Key = _generator.generatekey ();//_generator = null;//} catch (Exception e) {//throw new RuntimeException (//"Error initializing Sqlmap class. Cause: "+ e);//       }//    }        /*** Generate key based on parameters*/    Public voidSetkey (String strkey) {Try{keygenerator _generator= Keygenerator.getinstance ("DES" ); _generator.init (NewSecureRandom (Strkey.getbytes ("Utf-8"))); SecureRandom SecureRandom=Securerandom.getinstance ("Sha1prng");          Securerandom.setseed (Strkey.getbytes ()); _generator.init (56, SecureRandom);  This. Key =_generator.generatekey (); _generator=NULL ; } Catch(Exception e) {Throw NewRuntimeException ("Error Initializing Sqlmap class. Cause: "+e); }   }     /*** Encrypt string plaintext input, string ciphertext output*/     Publicstring Encryptstr (String strming) {byte[] Bytemi =NULL ; byte[] byteming =NULL ; String Strmi= "" ; Base64encoder Base64en=NewBase64encoder (); Try{byteming= Strming.getbytes ("UTF-8" ); Bytemi= This. Encryptbyte (byteming); Strmi=Base64en.encode (Bytemi); } Catch(Exception e) {Throw NewRuntimeException ("Error Initializing Sqlmap class. Cause: "+e); } finally{Base64en=NULL ; Byteming=NULL ; Bytemi=NULL ; }       returnStrmi; }     /*** Decrypt with string cipher input, string plaintext output * *@paramStrmi *@return      */     Publicstring Decryptstr (String strmi) {Base64decoder base64de=NewBase64decoder (); byte[] byteming =NULL ; byte[] Bytemi =NULL ; String strming= "" ; Try{Bytemi=Base64de.decodebuffer (Strmi); Byteming= This. Decryptbyte (Bytemi); Strming=NewString (byteming, "UTF-8" ); } Catch(Exception e) {Throw NewRuntimeException ("Error Initializing Sqlmap class. Cause: "+e); } finally{BASE64DE=NULL ; Byteming=NULL ; Bytemi=NULL ; }       returnstrming; }     /*** Encrypted with byte[] plaintext input, byte[] ciphertext output * *@paramByteS *@return      */    Private byte[] Encryptbyte (byte[] ByteS) {       byte[] Bytefina =NULL ;       Cipher Cipher; Try{cipher= Cipher.getinstance ("DES" ); Cipher.init (cipher.           Encrypt_mode, key); Bytefina=cipher.dofinal (ByteS); } Catch(Exception e) {Throw NewRuntimeException ("Error Initializing Sqlmap class. Cause: "+e); } finally{cipher=NULL ; }       returnBytefina; }     /*** Decryption in byte[] ciphertext input, in byte[] Clear text Output * *@parambyted *@return      */    Private byte[] Decryptbyte (byte[] byted)       {Cipher Cipher; byte[] Bytefina =NULL ; Try{cipher= Cipher.getinstance ("DES" ); Cipher.init (cipher.           Decrypt_mode, key); Bytefina=cipher.dofinal (byted); } Catch(Exception e) {Throw NewRuntimeException ("Error Initializing Sqlmap class. Cause: "+e); } finally{cipher=NULL ; }       returnBytefina; }     /*** file files are encrypted and saved in the target file destfile * *@paramfile * Files to be encrypted, such as C:/test/srcfile.txt *@paramDestFile * file names such as c:/are stored after encryption Post-encrypted file. txt*/     Public voidEncryptFile (string file, String destfile)throwsException {Cipher Cipher= Cipher.getinstance ("DES" ); //Cipher.init (Cipher.encrypt_mode, GetKey ());Cipher.init (cipher. Encrypt_mode, This. Key); InputStream is=Newfileinputstream (file); OutputStream out=NewFileOutputStream (destfile); CipherInputStream CIS=NewCipherInputStream (is, cipher); byte[] buffer =New byte[1024]; intR;  while((r = cis.read (buffer)) > 0) {out.write (buffer,0, R);       } cis.close ();       Is.close ();    Out.close (); }     /*** files are decrypted using DES algorithm * *@paramfile * Encrypted files such as c:/ Post-Encrypted file. txt * *@paramdestfile * Decrypted file name such as c:/test/after decryption file. txt*/     Public voidDecryptFile (string file, String dest)throwsException {Cipher Cipher= Cipher.getinstance ("DES" ); Cipher.init (cipher. Decrypt_mode, This. Key); InputStream is=Newfileinputstream (file); OutputStream out=NewFileOutputStream (dest); CipherOutputStream Cos=NewCipherOutputStream (out, cipher); byte[] buffer =New byte[1024]; intR;  while((r = is.read (buffer)) >= 0) {cos.write (buffer,0, R);       } cos.close ();       Out.close ();    Is.close (); }      Public Static voidMain (string[] args)throwsException {desutil des=NewDesutil ("jrkj123"); //DES Encrypted Files//des.encryptfile ("G:/test.doc", "g:/       Encryption Test.doc "); //DES decryption File//Des.decryptfile ("g:/ Encrypt Test.doc "," g:/ Decrypt Test.doc ");String str1 = "Taskid=68&correctdate=2015-04-13&flag=1" ; //DES Encrypted StringString str2 =des.encryptstr (STR1); //DES Decryption StringString destr =des.decryptstr (STR2); System. Out. println ("Before encryption:" +str1); System. Out. println ("After encryption:" +str2); System. Out. println ("After decryption:" +destr); }    }

Java-des algorithm encryption and Decryption tool class