DES encryption algorithm

1. Encryption

1) Page Introduction JS
<script type= "Text/javascript" src= "<%=path%>/js/jquery-1.8.0.min.js" ></script>
<script type= "Text/javascript" src= "./aes/tripledes.js" ></script>
<script type= "Text/javascript" src= "./aes/mode-ecb.js" ></script>

2) DES encryption method

function encryptbydes (message, key) {var keyhex = CryptoJS.enc.Utf8.parse (key); var encrypted = CryptoJS.DES.encrypt (message, Keyhex, {mode:cryptojs.mode.ecb,padding: CRYPTOJS.PAD.PKCS7}); return encrypted.tostring ();}

3) account password encryption

 var  username= Onm.val (); Username  = Encryptbydes (username, "kehrdooxwhcwtfesxvdvgqzq"  var  password= Ops.val ();p assword  = Encryptbydes (password, "kehrdooxwhcwtfesxvdvgqzq"  + "/ Login/login.do "" username ": Username, " Password ": password},  function   // debugger;  if  (Result = = null   "Login failed! " 

2. Decryption
String username = request.getparameter ("username");
Des decrypted Account
String desusername=desutil.decryption (username, "kehrdooxwhcwtfesxvdvgqzq");
String Password = request.getparameter ("password");
Des decryption after password
String despassword=desutil.decryption (password, "Kehrdooxwhcwtfesxvdvgqzq");

Desutil.java

 PackageCom.util;Importjava.security.InvalidKeyException;Importjava.security.NoSuchAlgorithmException;Importjava.security.spec.InvalidKeySpecException;Importjavax.crypto.BadPaddingException;ImportJavax.crypto.Cipher;Importjavax.crypto.IllegalBlockSizeException;Importjavax.crypto.NoSuchPaddingException;ImportJavax.crypto.SecretKey;Importjavax.crypto.SecretKeyFactory;ImportJavax.crypto.spec.DESKeySpec;/*** des plus decryption tool class * *@authorWang Xiangyu * * @date July 19, 2017 morning 11:03:51*/ Public classDesutil {Private Static FinalString des_algorithm = "DES"; /*** DES encryption * *@paramPlaindata Raw String *@paramSecretkey Encryption Key *@returnpost-encrypted String *@throwsException*/     Public StaticString encryption (String Plaindata, String secretkey)throwsException {Cipher Cipher=NULL; Try{cipher=cipher.getinstance (Des_algorithm);        Cipher.init (Cipher.encrypt_mode, GenerateKey (Secretkey)); } Catch(nosuchalgorithmexception e) {e.printstacktrace (); } Catch(nosuchpaddingexception e) {e.printstacktrace (); } Catch(InvalidKeyException e) {}Try {            //to prevent the decryption times javax.crypto.IllegalBlockSizeException:Input length must//Be multiple of 8 when decrypting with padded cipher exception,//the encrypted byte array cannot be converted directly to a string            byte[] buf =cipher.dofinal (Plaindata.getbytes ()); returnBase64utils.encode (BUF); } Catch(illegalblocksizeexception e) {e.printstacktrace (); Throw NewException ("Illegalblocksizeexception", E); } Catch(badpaddingexception e) {e.printstacktrace (); Throw NewException ("Badpaddingexception", E); }    }    /*** des decryption *@paramsecretdata Password String *@paramSecretkey decryption Key *@returnRaw String *@throwsException*/     Public StaticString decryption (String secretdata, String secretkey)throwsException {Cipher Cipher=NULL; Try{cipher=cipher.getinstance (Des_algorithm);        Cipher.init (Cipher.decrypt_mode, GenerateKey (Secretkey)); } Catch(nosuchalgorithmexception e) {e.printstacktrace (); Throw NewException ("NoSuchAlgorithmException", E); } Catch(nosuchpaddingexception e) {e.printstacktrace (); Throw NewException ("Nosuchpaddingexception", E); } Catch(InvalidKeyException e) {e.printstacktrace (); Throw NewException ("InvalidKeyException", E); }        Try {            byte[] buf =cipher.dofinal (Base64utils.decode (Secretdata.tochararray ())); return NewString (BUF); } Catch(illegalblocksizeexception e) {e.printstacktrace (); Throw NewException ("Illegalblocksizeexception", E); } Catch(badpaddingexception e) {e.printstacktrace (); Throw NewException ("Badpaddingexception", E); }    }    /*** Get Secret Key * *@paramSecretkey *@return     * @throwsnosuchalgorithmexception *@throwsinvalidkeyspecexception *@throwsinvalidkeyexception*/    Private Staticsecretkey GenerateKey (String secretkey)throwsnosuchalgorithmexception, Invalidkeyspecexception, invalidkeyexception {secretkeyfactory keyFactory=secretkeyfactory.getinstance (Des_algorithm); Deskeyspec KeySpec=NewDeskeyspec (Secretkey.getbytes ());        Keyfactory.generatesecret (KEYSPEC); returnKeyfactory.generatesecret (KEYSPEC); }    Static Private classBase64utils {Static Private Char[] alphabet = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/=". ToCharArray (); Static Private byte[] codes =New byte[256]; Static {             for(inti = 0; I < 256; i++) Codes[i]=-1;  for(inti = ' A '; I <= ' Z '; i++) Codes[i]= (byte) (I-' A ');  for(inti = ' a '; I <= ' z '; i++) Codes[i]= (byte) (+ i-' a ');  for(inti = ' 0 '; I <= ' 9 '; i++) Codes[i]= (byte) (+ I-' 0 ')); codes[' + '] = 62; codes['/'] = 63; }        /*** Encode raw data as base64 encoding*/        Static PrivateString Encode (byte[] data) {            Char[] out =New Char[((Data.length + 2)/3) * 4];  for(inti = 0, index = 0; i < data.length; i + = 3, index + = 4) {                BooleanQuad =false; BooleanTrip =false; intval = (0xFF & (int) data[i]); Val<<= 8; if((i + 1) <data.length) {val|= (0xFF & (int) Data[i + 1]); Trip=true; } Val<<= 8; if((i + 2) <data.length) {val|= (0xFF & (int) Data[i + 2]); Quad=true; } Out[index+ 3] = alphabet[(quad? (Val & 0x3F): 64)]; Val>>= 6; Out[index+ 2] = alphabet[(trip?) (Val & 0x3F): 64)]; Val>>= 6; Out[index+ 1] = alphabet[val & 0x3F]; Val>>= 6; Out[index+ 0] = alphabet[val & 0x3F]; }            return NewString (out); }        /*** DECODE Base64 encoded data into raw data*/        Static Private byte[] Decode (Char[] data) {            intLen = ((data.length + 3)/4) * 3; if(Data.length > 0 && data[data.length-1] = = ')                --Len; if(Data.length > 1 && data[data.length-2] = = ')                --Len; byte[] out =New byte[Len]; intShift = 0; intAccum = 0; intindex = 0;  for(intIX = 0; IX < Data.length; ix++) {                intValue = Codes[data[ix] & 0xFF]; if(Value >= 0) {Accum<<= 6; Shift+ = 6; Accum|=value; if(Shift >= 8) {Shift-= 8; Out[index++] = (byte) ((Accum >> shift) & 0xFF); }                }            }            if(Index! =out.length)Throw NewError ("Miscalculated Data length!"); returnOut ; }    }}

DES encryption algorithm