public static String getPasswordDigest(String nonce, String created, String password) {
if (nonce == null) {
return null;
}
if (created == null) {
return null;
}
if (password == null) {
return null;
}

byte[] nonceBytes = Base64.getDecoder().decode(nonce);

byte[] createdBytes = null;
try {
createdBytes = created.getBytes(codingUTF8);
} catch (UnsupportedEncodingException uee) {
return null;
}

byte[] passwordBytes = null;
try {
passwordBytes = password.getBytes(codingUTF8);
} catch (UnsupportedEncodingException uee) {
return null;
}

byte[] concatenatedBytes = new byte[nonceBytes.length + createdBytes.length + passwordBytes.length];

int offset = 0;
System.arraycopy(nonceBytes, 0, concatenatedBytes, offset, nonceBytes.length);
offset += nonceBytes.length;
System.arraycopy(createdBytes, 0, concatenatedBytes, offset, createdBytes.length);
offset += createdBytes.length;
System.arraycopy(passwordBytes, 0, concatenatedBytes, offset, passwordBytes.length);
System.out.println("concatenatedBytes = " + concatenatedBytes.toString());

MessageDigest messageDigest = null;
try {
// messageDigest = MessageDigest.getInstance(algorithmSHA);
messageDigest = MessageDigest.getInstance(algorithmSHA1);
} catch (NoSuchAlgorithmException nsae) {
return null;
}
messageDigest.update(concatenatedBytes);

String passwordDigest = Base64.getEncoder().encodeToString(messageDigest.digest());

return passwordDigest;
}