I have the following simple encryption code running in node.js:
var crypto = require('crypto');
var encKey = "FOO"; // Not the real key. Assume it works though.
var encrypt = function(str) {
var cipher = crypto.createCipher('aes-256-cbc', encKey);
var crypted = cipher.update(str, 'utf-8', 'hex');
crypted += cipher.final('hex');
return crypted;
};
Which I can also decrypt as below:
var crypto = require('crypto');
var encKey = "FOO"; // Not the real key. Assume it works though.
var decrypt = function(str) {
var decipher = crypto.createDecipher('aes-256-cbc', encKey);
var decrypted = decipher.update(str, 'hex', 'utf-8');
decrypted += decipher.final('utf-8');
return decrypted;
};
This all works fine. Strings are encrypting and decrypting as expected. But now I am faced with task of decrypting encrypted strings from this node.js code, in Java. And that is where things are going wrong and I am not sure why.
For decryption, My Java code looks like this:
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.security.MessageDigest;
import java.util.Arrays;
private static final String encKey = "FOO";
private static SecretKeySpec secretKey;
private static byte[] key;
public static String decrypt(String str) throws Exception {
String hexDecodedStr = new String(Hex.decodeHex(str.toCharArray()));
setKey(encKey);
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, secretKey);
return new String(cipher.doFinal(hexDecodedStr.getBytes()));
}
private static void setKey(String myKey) throws Exception {
MessageDigest sha = null;
try {
key = myKey.getBytes("UTF-8");
sha = MessageDigest.getInstance("SHA-1");
key = sha.digest(key);
key = Arrays.copyOf(key, 16);
secretKey = new SecretKeySpec(key, "AES");
}
catch (Exception e) {
throw e;
}
}
And it doesn't work. It seems like no matter what I try, I end up with some exception on the cipher.doFinal() call, or the String I get back is totally wrong. I know the node.js code is using aes-256-cbc, while the Java code is using AES/ECB/PKCS5Padding instead of AES/CBC/PKCS5Padding, but when I tried to use AES/CBC/PKCS5Padding, it was requiring an InitVector which I didn't have in node.js so I was unsure of how to proceed. Is node making an InitVector under the hood if not provided with one? Am I missing something totally obvious?
You seems to have the same issue as others OpenSSL encryption failing to decrypt C#
As far I understood the docs, the crypto libeary uses openssl. The openssl creates IV and key from the password using its EVP_BytesToKey function and random salt (not just hash). As dave pointed out, the crypto library uses no salt.
the output of openssl is Salted_{8 bytes salt}{ciphertext} so check what is output of the cipher ( I am unable to do it now)I wrote a small article how to encrypt properly in Java