How can I calculate the SHA-256 hash of a string in Android?

Question

I\'m trying to get the SHA256 of a string in Android.

Here is the PHP code that I want to match:

echo bin2hex(mhash(MHASH_SHA256,\"asdf\"));
//output         


        

Answer 1

Complete answer with use example, thanks to erickson.

Put this into your "Utils" class.

public static String getSha256Hash(String password) {
    try {
        MessageDigest digest = null;
        try {
            digest = MessageDigest.getInstance("SHA-256");
        } catch (NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        }
        digest.reset();
        return bin2hex(digest.digest(password.getBytes()));
    } catch (Exception ignored) {
        return null;
    }
}

private static String bin2hex(byte[] data) {
    StringBuilder hex = new StringBuilder(data.length * 2);
    for (byte b : data)
        hex.append(String.format("%02x", b & 0xFF));
    return hex.toString();
}

Example of use:

Toast.makeText(this, Utils.getSha256Hash("123456_MY_PASSWORD"), Toast.LENGTH_SHORT).show();