How to do AES Decryption in android, without writing decrypted file in SDcard storage? -

how aes decryption in android, without writing decrypted file in sdcard storage, directly use android application? or if other way file encryption offline data storage?

i used aes in android once, method use encrypt:

public static byte[] encryptaes(secretkey key, byte[] clear) {     try {          secretkeyspec skeyspec = new secretkeyspec(key.getencoded(), "aes");         cipher cipher = cipher.getinstance("aes");         cipher.init(cipher.encrypt_mode, skeyspec);         byte[] encrypted = cipher.dofinal(clear);         return encrypted;     } catch (exception e) {         e.printstacktrace();     }      return null; } 

this decrypting method:

public static byte[] decryptaes(secretkey key, byte[] encrypted) {     try {          secretkeyspec skeyspec = new secretkeyspec(key.getencoded(), "aes");         cipher cipher = cipher.getinstance("aes");         cipher.init(cipher.decrypt_mode, skeyspec);         byte[] decrypted = cipher.dofinal(encrypted);         return decrypted;     } catch (exception e) {         e.printstacktrace();     }      return null; } 

the following method generates random key aes:

public secretkey newaeskey() {      try {         string s_key = new biginteger(130, random).tostring(32);          keygenerator kgen = keygenerator.getinstance("aes");         securerandom sr = securerandom.getinstance("sha1prng");          sr.setseed(s_key.getbytes());         kgen.init(128, sr); // 192 , 256 bits may not available          secretkey skey = kgen.generatekey();         return skey;     } catch (exception e) {         e.printstacktrace();     }      return null; } 

so first generate random aes key , encrypt , decrypt bytes of want, in case used string data.

secretkey key = newaeskey();  ....  string params = "...."; byte[] encrypted_params = encryptaes(key, params.getbytes());