java - AES encryption returning different values on different machines -


my aes encryption program returning different encrypted values on different machines. can please on finding out needs done ensure same encrypted value returned on machine program run..

private static secretkeyspec secret; private static string seed; private static string text; private static string salt = "salt123"; private static int pswditerations = 65536; private static int keysize = 256;  /**  *   * @param myseed  */ public static void setseed(string myseed) {      try {         byte[] saltbytes = salt.getbytes("utf-8");         pbekeyspec spec = new pbekeyspec(myseed.tochararray(), saltbytes,                 pswditerations, keysize);         secretkeyfactory factory = secretkeyfactory                 .getinstance("pbkdf2withhmacsha1");         secretkey secretkey = factory.generatesecret(spec);         secret = new secretkeyspec(secretkey.getencoded(), "aes");      } catch (nosuchalgorithmexception e) {         e.printstacktrace();     } catch (unsupportedencodingexception e) {         e.printstacktrace();     } catch (invalidkeyspecexception e) {         e.printstacktrace();     }  }  public static string getencryptedstringfor(string text) {     try {         cipher cipher = cipher.getinstance("aes/ecb/pkcs5padding");         cipher.init(cipher.encrypt_mode, secret);         byte[] encrypteddata = cipher.dofinal(text.getbytes("utf-8"));         return new string(base64.encodebase64(encrypteddata));      } catch (exception e) {         system.out.println("error while encrypting: " + e.tostring());     }     return null; }  public static string getdecryptedstringfor(string text) {     try {         cipher cipher = cipher.getinstance("aes/ecb/pkcs5padding");         cipher.init(cipher.decrypt_mode, secret);         return (new string(cipher.dofinal(base64                 .decodebase64(text.getbytes("utf-8")))));     } catch (exception e) {         system.out.println("error while decrypting: " + e.tostring());     }     return null; }

some sample values

  • seed : seed123
  • text : #text!

  • encrypted value : rove3ksjzn0nnxcnsnprpg==

  • seed : seed!!

  • text : #text123!
  • encrypted value :x6pfukcvxxraeyqkko/kfq==

the thing can see in code following line:

return (new string(cipher.dofinal(base64.decodebase64(text.getbytes("utf-8")))));

now looks returning string after decoding utf-8. doesn't: uses platform default:

return (new string(     cipher.dofinal(         base64.decodebase64(             text.getbytes("utf-8")         )     ) ));

of course, first ( superfluous anyway, try this:

byte[] ciphertext = base64.decodebase64(text.getbytes("utf-8")); byte[] plaintext = cipher.dofinal(ciphertext); return new string(plaintext, "utf-8");

note can use import static java.nio.charsets.standardcharsets.utf_8 nowadays, lets away exception well. wish same standardciphers.aes_cbc_pkcs7padding :)


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