Powerschool Crypto for Login

Crypto.java

public class Crypto {
	private static String sStringToHMACMD5(String s, String keyString) {
		String sEncodedString = null;
		try {
			javax.crypto.spec.SecretKeySpec key = new javax.crypto.spec.SecretKeySpec((keyString).getBytes("UTF-8"), "HmacMD5");
			javax.crypto.Mac mac = javax.crypto.Mac.getInstance("HmacMD5");
			mac.init(key);

			byte[] bytes = mac.doFinal(s.getBytes("ASCII"));

			StringBuffer hash = new StringBuffer();

			for (byte b : bytes) {
				String hex = Integer.toHexString(0xFF & b);
				if (hex.length() == 1) {
					hash.append('0');
				}
				hash.append(hex);
			}
			sEncodedString = hash.toString();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return sEncodedString;
	}

	private static String MD5(String md5) {
		try {
			java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
			byte[] array = md.digest(md5.getBytes());
			StringBuffer sb = new StringBuffer();
			for (byte element : array) {
				sb.append(Integer.toHexString((element & 0xFF) | 0x100).substring(1, 3));
			}
			return sb.toString();
		} catch (java.security.NoSuchAlgorithmException e) {}
		return null;
	}

	private static String encodeBase64(String strToEncode) {
		try {
			return javax.xml.bind.DatatypeConverter.printBase64Binary(strToEncode.getBytes("UTF-8"));
		} catch (Exception e) {
			return null;
		}
	}
	
	public static String getPW(String contextData, String password) {
		return sStringToHMACMD5(contextData, encodeBase64(MD5(password)));
	}
}