java AES加密然后使用相同的密钥和IV在PHP中解密

Question

I follow this guide AES encryption on Java side - decryption on PHP side and selecting a single key but the accepted answer is not really working. I even hardcoded the KEY and IV values in java so that i am sure that i have the same values in PHP.

private static final byte[] keyValue =
        new byte[] { 'T', 'h', 'e', 'B', 'e', 's', 't',
                'S', 'e', 'c', 'r','e', 't', 'K', 'e', 'y' };

private static final byte[] ivValue =
        new byte[] { '0', '1', '2', '3', '4', '5', '6',
                '7', '8', '9', '0','1', '2', '3', '4', '5' };

JAVA (key) generation:

String ALGO = "AES/CBC/ZeroBytePadding";
Key key = new SecretKeySpec(keyValue, ALGO);

JAVA (iv) generation:

IvParameterSpec ivSpec = new IvParameterSpec(ivValue); 

Then i use it to Encrypt / Decrypt in JAVA like this:

  //ENCRYPTION
  String encrypted = encrypt("Hello World!",key,ivSpec);

  //DECRYPTION
  String decrypted = decrypt(encrypted,key,ivSpec);

public static String encrypt(String Data, Key key, IvParameterSpec ivSpec) throws Exception {

    Cipher c = Cipher.getInstance(ALGO);
    c.init(Cipher.ENCRYPT_MODE, key, ivSpec);       
    byte[] encVal = c.doFinal(Data.getBytes());     
    String encryptedValue = Base64.encodeToString(encVal, Base64.NO_WRAP);
    return encryptedValue;
}


public static String decrypt(String encryptedData, Key key, IvParameterSpec ivSpec) throws Exception {

    Cipher c = Cipher.getInstance(ALGO);
    c.init(Cipher.DECRYPT_MODE, key, ivSpec);   
    byte[] decordedValue = Base64.decode(encryptedData,Base64.NO_WRAP);
    byte[] decValue = c.doFinal(decordedValue);
    String decryptedValue = new String(decValue);
    return decryptedValue;
}

NOW, in PHP i get the encrypted value thru POST and i hardcoded the KEY and IV value:

$encrypted = $_POST["encrypted"];
$key = "TheBestSecretKey";
$iv = "0123456789012345";

$decrypted = decryptMessage($encrypted,$key,$iv);

function decryptMessage($encrypted,$key,$iv)
{
   $ivNum = (int)$iv;
   $ivIn = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC), $ivNum);
   $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $encrypted, MCRYPT_MODE_CBC, $ivIn);
}

Encrypted Message: TXCv3f+r+h71y/NzCk08Hw==

Expected Result of (decrypted) variable: "Hellow World!"

Current Result of (decrypted) variable: @ 6 I Ԗmݕ WMu

Is there any other workaround to achieve my expected result. Thank you in advance.

Answer 1

You need to provide the key, iv, input data and encrypted data in hex so they can be examined, encryption works with data, not strings.

key: 546865426573745365637265744b6579
iv: 30313233343536373839303132333435
text: 48656c6c6f7720576f726c6421

and encryption in CBC mode with zero padding you should get encrypted:

AE64AA4836D7251E03070C1647A4B531

but you don't, you get

4D70AFDDFFABFA1EF5CBF3730A4D3C1F

So it seems the encryption is bad.

See: AES CALCULATOR