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SecureRandom sr = new SecureRandom();

byte[] code = new byte[32];

sr.nextBytes(code);

String verifier = android.util.Base64.encodeToString(code, android.util.Base64.URL_SAFE | android.util.Base64.NO_WRAP | android.util.Base64.NO_PADDING);

byte[] bytes = new byte[0];

try {

bytes = verifier.getBytes("US-ASCII");

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

MessageDigest md = null;

try {

md = MessageDigest.getInstance("SHA-256");

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

}

md.update(bytes, 0, bytes.length);

byte[] digest = md.digest();

String challenge = android.util.Base64.encodeToString(digest, android.util.Base64.URL_SAFE | android.util.Base64.NO_WRAP | android.util.Base64.NO_PADDING);