I want tp encrypt and decrypt string, with defined salt. But the result must be same if the code run in java and adobe flex.
The main goal is: the app in adobe flex will be generate a string that can be decrypt in server using java.
I use this flex library
http://crypto.hurlant.com/demo/
Try to 'Secret Key' Tab. I want to use AES Encryption, 'CBC' or 'PKCS5'.
var k:String = "1234567890123456";
var kdata:ByteArray = Hex.toArray(k);
var txt:String = "hello";
var data:ByteArray = Hex.toArray(Hex.fromString(txt));;
var name:String = "simple-aes-cbc";
var pad:IPad =new PKCS5();
var mode:ICipher = Crypto.getCipher(name, kdata, pad);
pad.setBlockSize(mode.getBlockSize());
mode.encrypt(data);
encrypted.text=Hex.fromArray(data);
trace(Hex.fromArray(data));
And here is the code in java
String plaintext = "hello";
String key = "1234567890123456";
SecretKey keyspec = new SecretKeySpec(key.getBytes(), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE,keyspec);
byte[] encrypted = cipher.doFinal(plaintext.getBytes());
BASE64Encoder base64 = new BASE64Encoder();
String encodedString = base64.encode(encrypted);
System.out.println(encodedString);
Why the result is not same?
Can you guys provide the sample with the same result both of java and flex (encrypt and decrypt)? And if I want to change the paramater, for example, from cbc to ebc, which line that need to be changed?
Thanks!
"Simple" encryption mode (simple-aes-cbc) uses random initialization vector which is different each time you use it even if your secret key is the same.
If you wish to guarantee the same results when using the same key you should use "aes-cbc". Additionally you have to manually set the IV on the Cipher:
var ivmode:IVMode = mode as IVMode;
ivmode.IV = "some string guaranteed to be constant"
The IV can be made dependent on something like userId, which makes encryption repeatable for the same user.
You should consider how this affects your security scheme.
Seems like I do not convert into hex first in java when pass the key. And so on when get result byteArray at adobe flex, I do not cast again in java.
That's what I got when I see Arcadio code. Thanks.
Related
I'm trying to convert below java code into nodejs.
private static String TRANS_MODE = "Blowfish";
private static String BLOWFISH_KEY = "BLOWFISH_KEY";
public static String encrypt(String password) throws Exception {
SecretKeySpec keySpec = new SecretKeySpec(BLOWFISH_KEY.getBytes("Windows-31J"),TRANS_MODE);
Cipher cipher;
cipher = Cipher.getInstance(TRANS_MODE);
cipher.init(Cipher.ENCRYPT_MODE, keySpec);
byte[] passByte;
passByte = cipher.doFinal(password.getBytes("Windows-31J"));
return new String(Hex.encodeHex(passByte));
}
Here is what I was able to figure out-
const crypto = require('crypto');
function encrypt(password)
var fcKey = "BLOWFISH_KEY";
var cipher = crypto.createCipher('BF-CBC', fcKey, "");
var encrypted = cipher.update(password,'ascii','hex');
encrypted += cipher.final('hex');
return encrypted;
I'm not able to get same output. For example if
password= "password01"
Java Code output - fe0facbf8d458adaa47c5fe430cbc0ad
Nodejs Code output - ae5e8238c929b5716566e97fa35efb9b
Can someone help me figure out the problem ??
Notice that crypto.createCipher(algorithm, password[, options]) is deprecated and should not be used.
Where the SecretKeySpec(..) in java takes a binary key as input, the createCipher(..) in js takes a "password" as input, and behind the scene tries to derive a binary key using MD5. So your actually key used in the two programs ends up being different. The js methode
also tries to derive an IV from the password, which is bad practice and different from your java code.
In js you need to use the crypto.createCipheriv() instead. And when you are at it, you also need to consider if an iv is needed - both in Java and in js.
Some background of what I'm trying to accomplish.
Part 1.
PHP server communicates with a Java-based device. PHP uses OpenSSL to generate a public/private keypair, then sends the public key to the device which in turn gives back an encrypted macKey (generated using the public key), encoded in base64. PHP now needs to base64-decode and decrypt the macKey using the private key.
What is the equivalent of the below Java code snippet in PHP?
String base64EncodedMacKey = "LkvTT9LFj5lcxRRB8KrwwN906fSIDDcJvQK3E7a5PbR+Ox9WnslOs32jSCC9FkE8ouvr2MfWwtppuZmoPjaxwg3yAQI4UN3T1loISuF2VwKWfJ45fywbK9bNnD5Cw7336mjoGctv77Tg3JXPrsRwgMGIlBsNwdt1B0wgT4MMMAjl32TnBI3iwQ94VTMHffrK+QToddTahRHHoVsr3FVrETdiqKXdkiX1jES53im5lrXYIsY89UFkGzPo+3u4ijKIQWSLvYnA5wXI128gFHKxKYS82MbJDUn9i1RVFsGaP6T3nQRSX5SZNpSe5yGFWwMgYOx0KXMgET82FeaL2hfWuw==";
byte[] base64DecodedMacKey = DatatypeConverter.parseBase64Binary(base64EncodedMacKey);
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.DECRYPT_MODE, keypair.getPrivate());
byte[] macKey = cipher.doFinal(base64DecodedMacKey);
Here's what I attempted in PHP, however I'm confused about using byte array versus string when decrypting the macKey
$macKey = 'LkvTT9LFj5lcxRRB8KrwwN906fSIDDcJvQK3E7a5PbR+Ox9WnslOs32jSCC9FkE8ouvr2MfWwtppuZmoPjaxwg3yAQI4UN3T1loISuF2VwKWfJ45fywbK9bNnD5Cw7336mjoGctv77Tg3JXPrsRwgMGIlBsNwdt1B0wgT4MMMAjl32TnBI3iwQ94VTMHffrK+QToddTahRHHoVsr3FVrETdiqKXdkiX1jES53im5lrXYIsY89UFkGzPo+3u4ijKIQWSLvYnA5wXI128gFHKxKYS82MbJDUn9i1RVFsGaP6T3nQRSX5SZNpSe5yGFWwMgYOx0KXMgET82FeaL2hfWuw==';
$base64DecodedMacKey = base64_decode($macKey);
openssl_private_decrypt($base64DecodedMacKey, $decrypted, $privateKey);
The $decrypted above holds some binary data as it appears, so I'm unsure whether I need to convert it into a byte array or treat it as a string...
Part 2.
Each request has a counter. The macKey in Java code above is used to create a MAC value out of the counter.
What is the equivalent of the below Java code snippet in PHP?
int counter = 0;
String nextCounter = String.valueOf(++counter);
SecretKeySpec signingKey = new SecretKeySpec(macKey, "AES");
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(signingKey);
byte[] counterMac = mac.doFinal(nextCounter.getBytes("UTF-8"));
String base64EncodedMac = DatatypeConverter.printBase64Binary(counterMac);
The base64EncodedMac above is finally sent to the device to validate communication.
I've tried googling different solutions, however I've not been successful in generating a valid base64EncodedMac string in PHP for the device to approve it.
Found the solution myself. For Part 1, I chose to use phpseclib to generate the public/private keys and to specify the encryption algorithm. Decrypting macKey:
$rsa = new Crypt_RSA();
$keys = $rsa->createKey(2048);
// [...]
$macKey = base64_decode($base64EncodedMacKey);
$rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_PKCS1);
$rsa->loadKey($keys['privatekey']);
$decryptedMac = $rsa->decrypt($macKey);
Followed by Part 2:
$counter = 0;
$hmac = hash_hmac('sha256', ++$counter, $decryptedMac, true);
$counterMac = base64_encode($hmac);
The main confusing part was that in Java, HMAC was done out of byte array, while in PHP the hash_hmac function expects a String as its 2nd parameter, so using unpack() was not sufficient. However, it seems to have worked with passing the $counter directly. It was also important to use the 4th parameter as TRUE to return raw data.
i'm triying encrypt a password. firstly i will set a rsa public key, after encyrpt a password. but my results are not equals between java and javascript code. is there a way or sample. Could you help me? thanks.
here is my javascript code
var rsa = new RSAKey();
rsa.setPublic(rasn, rase);
var res = rsa.encrypt("myPassword");
return restotal;
here is my java code
RSA1 rsa = new RSA1(new BigInteger(rasn.getBytes()),new BigInteger(rase.getBytes()));
String text1 = "myPassword";
BigInteger plaintext = new BigInteger(text1.getBytes());
BigInteger ciphertext = rsa.encrypt(plaintext);
System.out.println(ciphertext);
Not sure what your RSA1 class exactly does, but you can check a nice sample here.
Your results will never be same, because before RSA encryption, your data will be appended with random bytes called padding.
If you want to test your encryption, decrypt the result back with your private key and see if it works. You can do this between javascript and java if you wish.
So i have an android app, and a google app engine server written in python.
The android app needs to send some sensible information to the server, and the way I do that is by doing an http post.
Now i have been thinking about encrypting the data in android before sending it, and decrypting it once it is on the gae server.
This is how i encrypt and decrypt in java :
private static final String ALGO = "AES";
public static String encrypt(String Data) throws Exception {
Key key = generateKey();
Cipher c = Cipher.getInstance(ALGO);
c.init(Cipher.ENCRYPT_MODE, key);
byte[] encVal = c.doFinal(Data.getBytes());
// String encryptedValue = new BASE64Encoder().encode(encVal);
byte[] decoded = Base64.encodeBase64(encVal);
return (new String(decoded, "UTF-8") + "\n");
}
public static String decrypt(String encryptedData) throws Exception {
Key key = generateKey();
Cipher c = Cipher.getInstance(ALGO);
c.init(Cipher.DECRYPT_MODE, key);
byte[] decordedValue =Base64.decodeBase64(encryptedData);
byte[] decValue = c.doFinal(decordedValue);
String decryptedValue = new String(decValue);
return decryptedValue;
}
private static Key generateKey() throws Exception {
Key key = new SecretKeySpec(Constant.keyValue, ALGO);
return key;
}
And this is how i try to decrypt on the server (i don't know yet how to do the encryption..maybe you guys can help with that too)
def decrypt(value):
key = b'1234567891234567'
cipher = AES.new(key, AES.MODE_ECB)
msg = cipher.decrypt(value)
return msg
As i looked in the logs, the string test that i get is : xVF79DzOplxBTMCwAx+hoeDJhyhifPZEoACQJcFhrXA= and because it is not a multiple of 16 (idk why, i guess this is because of the java encryption) i get the error
ValueError: Input strings must be a multiple of 16 in lenght
What am i doing wrong?
Why are you not using ssl (aka https)? That should provide all the encryption needed to transport data securely and privately between the phone and App Engine.
The basics of it: Instead of sending data to http://yourapp.appspot.com/, send it to https://yourapp.appspot.com/.
For a complete secure and authenticated channel between App Engine and Android, you can use Google Cloud Endpoints. It will even generate the Android side code to call it.
Java:
https://developers.google.com/appengine/docs/java/endpoints/
https://developers.google.com/appengine/docs/java/endpoints/consume_android
Python:
https://developers.google.com/appengine/docs/python/endpoints/
https://developers.google.com/appengine/docs/python/endpoints/consume_android
For a longer show and tell, check the IO 13 talk: https://www.youtube.com/watch?v=v5u_Owtbfew
This string "xVF79DzOplxBTMCwAx+hoeDJhyhifPZEoACQJcFhrXA=" is a base64-encoded value.
https://en.wikipedia.org/wiki/Base64
Base64 encoding is widely used lots of applications, it's a good way to encode binary data into text. If you're looking at a long encoded value, the "=" at the end can be a good indicator of base64 encoding.
In your python code you probably need to base64 decode the data before handing it to the decryption function.
I have two recommendations:
If crypto isn't a comfort zone for you, consult with someone who is good in this area for your project.
Be aware that embedding a symmetric encryption key in an Android app that you distribute is a bad idea. Anyone that can get a copy of your app can extract that key and use it to decrypt or spoof your messages.
I have an app with java and PHP files. The java files send content to the PHP files, and this one send the response to the java file, by HTTP everything. I have the response with JSON format.
I would like to encrypt the information and decode it in the other side, java->php and php->java(this is the most important) but I don't know how to do it.
Edit:
I am trying BLOWFISH, here is my code in PHP(crypt the data and send to Java) and Java(get the data and decode it)
PHP
$key = "this is the key";
$crypttext = mcrypt_encrypt(MCRYPT_BLOWFISH, $key, $result_json, MCRYPT_MODE_ECB);
echo($crypttext);
JAVA
public String decryptBlowfish(String to_decrypt, String strkey) {
System.out.println(to_decrypt);
try {
SecretKeySpec key = new SecretKeySpec(strkey.getBytes(), "Blowfish");
Cipher cipher = Cipher.getInstance("Blowfish");
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] decrypted = cipher.doFinal(to_decrypt.getBytes());
return new String(decrypted);
} catch (Exception e) {
System.out.println(e.getMessage());
;
return null;
}
}
System.out.println(decryptBlowfish(result, "this is the key"));
The result when I execute is:
Input length must be multiple of 8 when encrypting with padded cipher
or sometimes
Given final block not properly padded
Agreed with the comment that's what SSL is for see here for a client java application that uses SSL Certificate and encryption to connect to an HTTPS/SSL site: http://www.mkyong.com/java/java-https-client-httpsurlconnection-example/ next you might want to have an HTTPS/SSL php server this should help: http://cweiske.de/tagebuch/ssl-client-certificates.htm Or use this Opensource library: http://nanoweb.si.kz/
If the above fails then I don't know, but a last resort would be writing your own, you may never know how secure it really is?
You might want to use the same algorithm for decoding/decrypting namely "blowfish/ecb/nopadding" instead of "blowfish".
private static final String DECRYPTION_ALGORITHM = "blowfish/ecb/nopadding";
private static final String KEY_ALGORITHM = "blowfish";
private static byte[] decrypt(byte[] keyData, byte[] valueData) throws Exception {
SecretKeySpec keySpec = new SecretKeySpec(keyData, KEY_ALGORITHM);
Cipher cipher = Cipher.getInstance(DECRYPTION_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, keySpec);
return cipher.doFinal(valueData);
}
If you don't want SSL, which I recommend too, you can try this:
$str = 'hello world'; //your input data
$pass = 'haj83kdj843j'; //something random, the longer the better
$l = strlen($pass);
for ($i=0; $i<strlen($str); $i++)
{
$str[$i] = chr(ord($str[$i]) + ord($pass[$i % $l]));
}
It is fast and easy to write a coder/encoder in any language you want. The resulting string is a binary string so you might want to convert it using base64_encode or something. Should give quite good security.