Android--des encryption

Base64.java

ImportJava.io.ByteArrayOutputStream;Importjava.io.IOException;ImportJava.io.OutputStream; Public classBase64 {Private Static Final Char[] Legalchars = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/". ToCharArray (); /*** data[] to encode * *@paramData *@return     */     Public StaticString Encode (byte[] data) {                intStart = 0; intLen =data.length; StringBuffer buf=NewStringBuffer (Data.length * 3/2); intEnd = Len-3; inti =start; intn = 0;  while(I <=end) {                    intD = ((((int) Data[i]) & 0x0ff) << 16)                            | ((((int) Data[i + 1]) & 0X0FF) << 8)                            | (((int) Data[i + 2]) & 0X0FF); Buf.append (legalchars[(d>>) & 63]); Buf.append (legalchars[(d>>) & 63]); Buf.append (legalchars[(d>> 6) & 63]); Buf.append (Legalchars[d& 63]); I+ = 3; if(n++ >= 14) {n= 0; Buf.append (" "); }                }                 if(i = = start + len-2) {                    intD = ((((int) Data[i]) & 0x0ff) << 16)                            | ((((int) Data[i + 1]) & 255) << 8); Buf.append (legalchars[(d>>) & 63]); Buf.append (legalchars[(d>>) & 63]); Buf.append (legalchars[(d>> 6) & 63]); Buf.append ("="); } Else if(i = = start + len-1) {                    intD = (((int) Data[i]) & 0x0ff) << 16; Buf.append (legalchars[(d>>) & 63]); Buf.append (legalchars[(d>>) & 63]); Buf.append ("=="); }                 returnbuf.tostring (); }    Private Static intDecodeCharc) {if(c >= ' A ' && C <= ' Z ')            return((int) c)-65; Else if(c >= ' a ' && c <= ' z ')            return((int) c)-97 + 26; Else if(c >= ' 0 ' && C <= ' 9 ')            return((int) c)-48 + 26 + 26; Else            Switch(c) { Case+:                return62;  Case‘/‘:                return63;  Case=:                return0; default:                Throw NewRuntimeException ("Unexpected code:" +c); }    }    /*** Decodes the given BASE64 encoded String to a new byte array.     The byte * Array holding the decoded data is returned. */     Public Static byte[] Decode (String s) {bytearrayoutputstream bos=NewBytearrayoutputstream (); Try{decode (S, BOS); } Catch(IOException e) {Throw Newruntimeexception (); }        byte[] Decodedbytes =Bos.tobytearray (); Try{bos.close (); Bos=NULL; } Catch(IOException ex) {System.err.println ("Error while decoding BASE64:" +ex.tostring ()); }        returndecodedbytes; }    Private Static voidDecode (String s, OutputStream OS)throwsIOException {inti = 0; intLen =s.length ();  while(true) {             while(I < len && S.charat (i) <= ") I++; if(i = =len) Break; intTri = (decode (S.charat (i)) << 18)                    + (Decode (S.charat (i + 1)) << 12)                    + (Decode (S.charat (i + 2)) << 6)                    + (Decode (S.charat (i + 3))); Os.write (Tri>>) & 255); if(S.charat (i + 2) = = ' = ')                 Break; Os.write (Tri>> 8) & 255); if(S.charat (i + 3) = = ' = ')                 Break; Os.write (Tri& 255); I+ = 4; }    }}

Des.java

 Packagecn.crane.game.puzzle.utils.security;ImportJavax.crypto.Cipher;ImportJavax.crypto.spec.IvParameterSpec;ImportJavax.crypto.spec.SecretKeySpec; Public classDES {Private Static byte[] IV = {1, 2, 3, 4, 5, 6, 7, 8 }; /*** Encryption * *@paramencryptstring *@paramEncryptkey *@return     * @throwsException*/     Public Staticstring Encryptdes (String encryptstring, String encryptkey) {//Ivparameterspec zeroiv = new Ivparameterspec (new byte[8]);        Try{ivparameterspec Zeroiv=NewIvparameterspec (iv); Secretkeyspec Key=NewSecretkeyspec (Encryptkey.getbytes (), "DES"); Cipher Cipher= Cipher.getinstance ("des/cbc/pkcs5padding");            Cipher.init (Cipher.encrypt_mode, Key, ZEROIV); byte[] EncryptedData =cipher.dofinal (Encryptstring.getbytes ()); returnBase64.encode (EncryptedData); } Catch(Exception e) {e.printstacktrace (); }        return""; }    /*** Decryption * *@paramdecryptstring *@paramDecryptkey *@return     * @throwsException*/     Public Staticstring Decryptdes (String decryptstring, String decryptkey) {Try {            byte[] Bytemi =Base64.decode (decryptstring); Ivparameterspec Zeroiv=NewIvparameterspec (iv); //Ivparameterspec zeroiv = new Ivparameterspec (new byte[8]);Secretkeyspec key =NewSecretkeyspec (Decryptkey.getbytes (), "DES"); Cipher Cipher= Cipher.getinstance ("des/cbc/pkcs5padding");            Cipher.init (Cipher.decrypt_mode, Key, ZEROIV); byteDecrypteddata[] =cipher.dofinal (Bytemi); return NewString (Decrypteddata); } Catch(Exception e) {e.printstacktrace (); }        return""; }}