Method hexStringToByteArray

examples/signature.java:39–47

(String hex)

    }

    private static byte[] hexStringToByteArray(String hex){
        if (hex.length() % 2 != 0)
            throw new IllegalArgumentException("Even-length string required");
        byte[] res = new byte[hex.length() / 2];
        for (int i = 0; i < res.length; i++) {
            res[i]=(byte)((Character.digit(hex.charAt(i * 2), 16) << 4) | (Character.digit(hex.charAt(i * 2 + 1), 16)));
        }
        return res;
    }
}