Could anyone tell me how I would decrypt data (using Java) that has been encrypted with this PHP function?
public function pad($data, $blocksize = 16) {
$pad = $blocksize - (strlen($data) % $blocksize);
return $data . str_repeat(chr($pad), $pad);
}
public function decryptECB($data) {
return mcrypt_decrypt(MCRYPT_RIJNDAEL_128, self::BLOB_ENCRYPTION_KEY, self::pad($data), MCRYPT_MODE_ECB);
}
public function encryptECB($data) {
return mcrypt_encrypt(MCRYPT_RIJNDAEL_128, self::BLOB_ENCRYPTION_KEY, self::pad($data), MCRYPT_MODE_ECB);
}
I have tried most of the things here but most of them are without padding and even when I add padding they don't work.
Edit 1:
(From PHP)
The input looks like this: http://pastebin.com/2cyig9nh
Key is this:
M02cnQ51Ji97vwT4
And output is this: http://pastebin.com/XcA50UGH
(The Java code)
public class Mcrypt {
private SecretKeySpec keyspec;
private Cipher cipher;
private String SecretKey = "M02cnQ51Ji97vwT4";
public Mcrypt() {
keyspec = new SecretKeySpec(SecretKey.getBytes(), "AES");
try {
cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
}
}
public String encrypt(String text) throws Exception {
if (text == null || text.length() == 0)
throw new Exception("Empty string");
byte[] encrypted = null;
try {
cipher.init(Cipher.ENCRYPT_MODE, keyspec );
encrypted = cipher.doFinal(padString(text).getBytes());
} catch (Exception e) {
throw new Exception("[encrypt] " + e.getMessage());
}
return Base64.encodeBase64String(encrypted);
}
public byte[] decrypt(String code) throws Exception {
if (code == null || code.length() == 0)
throw new Exception("Empty string");
byte[] decrypted = null;
try {
cipher.init(Cipher.DECRYPT_MODE, keyspec );
decrypted = cipher.doFinal(new Base64().decode(code.getBytes()));
} catch (Exception e) {
throw new Exception("[decrypt] " + e.getMessage());
}
return decrypted;
}
private static String padString(String source) {
char paddingChar = ' ';
int size = 16;
int x = source.length() % size;
int padLength = size - x;
for (int i = 0; i < padLength; i++) {
source += paddingChar;
}
return source;
}
}
You are encoding and decoding to Base64 in your Java code, but your PHP code does not seem to perform any encoding/decoding whatsoever. This seems to be confirmed by what you posted on Pastebin. If you want to use strings instead of bytes - bytes are the only input accepted by modern ciphers - then you should make sure that the (character) encoding is correct on both sides. If you just want to use bytes, don't decode the binary in Java - the input is already in bytes, not text.
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