so I encrypted a string on my php server.
encrypt("http://google.com", "happy");
function encrypt($str, $key)
{
$block = mcrypt_get_block_size('des', 'ecb');
$pad = $block - (strlen($str) % $block);
$str .= str_repeat(chr($pad), $pad);
return mcrypt_encrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);
}
btw, this returns some weird string...I was expecting letters and numbers:
ZöÞ ÔP»8
Back on Java, I need to decrypt this string with the key.
This may help for MCrypt in java:
Another link:
http://www.kanatorn.info/2011/11/07/aes-encrypt-decrypt-between-java-php/
I'm not au fait with mcrypt, but running ASCII plaintext through encryption doesn't always result in an ASCII ciphertext. Chances are your generated encrypted ciphertext is going to translate into a 'weird string' when you try and interpret it as ASCII or unicode text.
first, make sure it isn't an one-way encryption. second, algorithm and arguments used in php and reverse engineering in java
I think this will be useful. Note that the charset is UTF-8.
public class Foo {
public static void main(String[] args) {
try {
String cipherSpec = "DES/ECB/NoPadding";
Cipher cipher = Cipher.getInstance(cipherSpec);
int blockSize = cipher.getBlockSize();
String keyText = "happy";
Key key = new SecretKeySpec(padRight(keyText, blockSize).getBytes("UTF-8"), "DES");
String input = "http://google.com";
input = padRight(input, input.length() + blockSize - (input.length() % blockSize));
// encrypt
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] cipherText = cipher.doFinal(input.getBytes(CHARSET));
System.out.println("\ncipher text: ");
System.out.println(new String(cipherText, CHARSET));
// decrypt
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] plainText = cipher.doFinal(cipherText);
System.out.println("\nplain text: ");
System.out.println(new String(plainText, CHARSET));
} catch (Exception e) {
e.printStackTrace();
}
}
final static String CHARSET = "UTF-8";
static String padRight(String s, int n) {
return String.format("%1$-" + n + "s", s);
}
}
