Generate Key from string?

Question

I need to generate a Key from a string, such that I can always create the same key from the same string. (Specifically a Key object, so that I can use it to create a Cipher in t

Answer 1

You want to use PBKDF2 or bcrypt for this. The former is more widely used in my experience. It appears, based on this comment, that java does support this.

SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
KeySpec spec = new PBEKeySpec(password, salt, 65536, 256);
SecretKey tmp = factory.generateSecret(spec);
SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");