RIJNDAEL encryption using Java

Question

RIJNDAEL encryption using Java

I need to code plaintext in Java and php where the result should be the same.

The following conditions are given:

: RIJNDAEL-128
: 1234567890123456
mode: cfb
Initialization Vector: 1234567890123456

The following codes work and fulfill the first second requirement, but it uses ECB as a mode and therefore does not use an initialization vector:

PHP:

 <?php  
        $cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');     
        $cleartext = 'abcdefghijklmnop';    
        $key128 = '1234567890123456';
        $iv = '1234567890123456';

        if (mcrypt_generic_init($cipher, $key128, $iv) != -1)  //Parameter iv will be ignored in ECB mode
        {
            $cipherText = mcrypt_generic($cipher,$cleartext );
            mcrypt_generic_deinit($cipher);     
            printf(bin2hex($cipherText));       
        }
    ?>

Output: fcad715bd73b5cb0488f840f3bad7889

JAVA:

public class AES {

    public static void main(String[] args) throws Exception {
        String cleartext = "abcdefghijklmnop";
        String key = "1234567890123456";
        SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(), "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        byte[] encrypted = cipher.doFinal(cleartext.getBytes());
        System.out.println(asHex(encrypted));
    }

    public static String asHex(byte buf[]) {
        StringBuffer strbuf = new StringBuffer(buf.length * 2);
        int i;
        for (i = 0; i < buf.length; i++) {
            if (((int) buf[i] & 0xff) < 0x10)
                strbuf.append("0");
            strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
        }
        return strbuf.toString();
    }

}

Exit (same as in PHP version): fcad715bd73b5cb0488f840f3bad7889

So, now to fulfill requirements 3 and 4, I changed the mode to MCRYPT_MODE_CFB in my version of PHP so that the code looks like this:

 <?php  
        $cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CFB, '');     
        $cleartext = 'abcdefghijklmnop';    
        $key128 = '1234567890123456';
        $iv = '1234567890123456';


        if (mcrypt_generic_init($cipher, $key128, $iv) != -1)  //Parameter iv will be ignored in ECB mode
        {
            $cipherText = mcrypt_generic($cipher,$cleartext );
            mcrypt_generic_deinit($cipher);     
            printf(bin2hex($cipherText));       
        }
    ?>

The result is the following result: 14a53328feee801b3ee67b2fd627fea0

In the JAVA version, I also adapted the mode and added iv to the init function of my Cipher object.

public class AES {

    public static void main(String[] args) throws Exception {
        String cleartext = "abcdefghijklmnop";
        String key = "1234567890123456";
        SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(), "AES");
        Cipher cipher = Cipher.getInstance("AES/CFB/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec,  new IvParameterSpec("1234567890123456".getBytes()));
        byte[] encrypted = cipher.doFinal(cleartext.getBytes());
        System.out.println(asHex(encrypted));
    }

    public static String asHex(byte buf[]) {
        StringBuffer strbuf = new StringBuffer(buf.length * 2);
        int i;
        for (i = 0; i < buf.length; i++) {
            if (((int) buf[i] & 0xff) < 0x10)
                strbuf.append("0");
            strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
        }
        return strbuf.toString();
    }

}

: 141eae68b93af782b284879a55b36f70, PHP.

- , JAVA PHP?

+3

java php rijndael

Paul 13 . '12 7:05

2

Raider · Answer 1 · 2012-05-22T16:03:33+0000

, PHP MCRYPT_RIJNDAEL_128 MCRYPT_MODE_CFB , Java AES/CFB8/NoPadding.

, PHP:

$encrypted = base64_encode( mcrypt_encrypt( MCRYPT_RIJNDAEL_128, $key, $cleartext, MCRYPT_MODE_CFB, $iv ) );

Java:

SecretKeySpec   key = new SecretKeySpec(KEY.getBytes(), "AES");
IvParameterSpec iv  = new IvParameterSpec(IV.getBytes());

Cipher cipher = Cipher.getInstance("AES/CFB8/NoPadding");
cipher.init(Cipher.ENCRYPT_MODE, key, iv);

byte[] output = cipher.doFinal(cleartext.getBytes());

String signature = Base64.encode(output);

mfrankli · Answer 2 · 2012-04-13T07:12:18+0000

:

, PHP "MCRYPT_RIJNDAEL_128" , Java "AES". AES Wiki entry RIJNDAEL AES .
CBC PHP-, CFB Java. , , , .
PHP , Java- PKCS5Padding. Java "Cipher.getInstance" ( "AES/CFB/NoPadding" );

, , SecretKeySpec , AES. :

KeyGenerator keygen = KeyGenerator.getInstance("AES");
SecureRandom sec = new SecureRandom(key.getBytes());
keygen.init(128, sec);
Key key = keygen.generateKey();
SecretKeySpec skeySpec = new SecretKeySpec(key.getEncoded(), "AES");
...

, String SecretKey, .

RIJNDAEL encryption using Java

More articles: