Q:

Why I get different results with PBKDF2 on different machines?

I have am trying to use PBKDF2 to store passwords. I am then using the code with the password hashes it generated on a different machine.
I am using this method to encrypt my passwords:
public  String pwdEncodePBKDF2(String unencryptedPassword,String salt)
{
try
{
        if(salt.isEmpty())
        {
            salt = generateSalt(SystemSecurity.SALTLENGTH);
        }
        String algorithm = "PBKDF2WithHmacSHA1";
        int derivedKeyLength = 160;
        int iterations = 1000;
        KeySpec spec = new PBEKeySpec(unencryptedPassword.toCharArray(), salt.getBytes(), iterations, derivedKeyLength);
        SecretKeyFactory f = SecretKeyFactory.getInstance(algorithm);
        StringBuffer hexString = new StringBuffer();
        byte[] mdbytes  =  f.generateSecret(spec).getEncoded();
        for (int i=0;i<mdbytes.length;i++)
        {
            hexString.append(Integer.toHexString(0xFF & mdbytes[i]));
        }
        String hashedPassword = hexString.toString();
        return hashedPassword  + salt;
    }
    catch(Exception e)
    {
        e.printStackTrace();
        throw new RuntimeException("Error computing hash: "+e.getMessage());
    }        
}

It works fine, but when I run it on a different machine (i.e. install my project on a different machine, with a database that has an encrypted of a default password from the machine I run on initially)
I see that with the same salt and password it give me a different encryption.
As far as I understand the SecretKeyFactory methods depend only on the inputs I give them, or do they depend on the machine I am running on as well?
If so, how can I save a default password for first installation with this security mechanism without running any extra code during installation?
Thank You!

A:

I think the problem may be in different default String encodings.
Check that your strings use same encoding.
you can try to check bytes using 
salt.getBytes()

it return bytes in default encoding, may be machines has different encodings.

You can just replace salt.getBytes(), with somethink like salt.getBytes("UTF-8"); may be it will help.

