gistfile1.java

    @NotNull
    @Override
    public User find(byte[] bytes) {
        byte[] decrypted;
        try {
            decrypted = decrypter.doFinal(bytes);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        StringBuilder salt = new StringBuilder(),
                      username = new StringBuilder(),
                      password = new StringBuilder();
        int username_length = 0;

        // ojagawgiqxtawwicppjbzhteloapxhwp\u0006foobarbuzz
        // [salt:32] [username_length:1] [username:username_length] [password:-1]
        for (int i = 0; i < decrypted.length; ++i) {
            if (i < 32) { // first 32 characters are the salt
                salt.append((char) decrypted[i]);
            } else if (i == 32) { // 33rd byte is username's length
                username_length = decrypted[i];
            } else if (i <= 32 + username_length) { // next characters are the username
                username.append((char) decrypted[i]);
            } else { // remaining characters are the password
                password.append((char) decrypted[i]);
            }
        }

        return authenticate(username.toString(), password.toString(), salt.toString());
    }