Android aes encryption pad block corrupted -

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i using methods below , if enter right key works fine. if enter wrong key receiving badpaddingexception:pad block corrupted... doing wrong? 

public  void initkey(string passwd, byte[] salt) throws nosuchalgorithmexception, invalidkeyspecexception, nosuchproviderexception{      byte[] localsalt = salt;     pbekeyspec password = new pbekeyspec(passwd.tochararray(),localsalt, 1024,128);//, localsalt, 1000, 128);  //128bit enc aes    secretkeyfactory factory = secretkeyfactory.getinstance("pbewithmd5and128bitaes-cbc-openssl","bc");      pbekey key = (pbekey) factory.generatesecret(password);      enckey = new secretkeyspec(key.getencoded(), "aes"); }   public   string txt2enc(string etxt) throws nosuchalgorithmexception, nosuchpaddingexception, invalidkeyexception, illegalblocksizeexception, badpaddingexception, unsupportedencodingexception {         final cipher cipher = cipher.getinstance("aes");//aes               cipher.init(cipher.encrypt_mode, enckey);               byte[] encrypted = cipher.dofinal((etxt).getbytes("utf-8"));        return base64.encodetostring(encrypted, 0); }  //decryption public  string txt2dec(string dtxt) throws invalidkeyexception, nosuchalgorithmexception, nosuchpaddingexception, illegalblocksizeexception, badpaddingexception, unsupportedencodingexception{      final cipher cipher = cipher.getinstance("aes");     cipher.init(cipher.decrypt_mode, enckey);     byte[] decrypt = cipher.dofinal(base64.decode(dtxt, 0));     return new string(decrypt);//return base64.encodetostring(decrypt, 0); }

you're not doing wrong. it's expected. technically duplicate of java encryption issue (which doesn't seem easy find). see answer explanation. can consider adding mac (message authentication code) safely accomplish more checksum.


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