package com.semanticsquare.thrillio.util;

import java.security.MessageDigest;

public class StringUtil {
	private final static String ENC_ALGO = "SHA";
	
	/**
     * Encode a string and return the resulting encrypted password. 
     * If exception, then plain credential string is returned.
     * @param password Password or other credentials to use in authenticating
     *        this username
     * @return encypted password based on the algorithm.
     */
    public static String encodePassword(String password) {
        byte[] unencodedPassword = password.getBytes();
        MessageDigest md = null;
        try {
            // first create an instance, given the provider
            md = MessageDigest.getInstance(ENC_ALGO);
        } catch (Exception e) {
            //log.error("Exception: " + e);
            return password;
        }
        md.reset();
        // call the update method one or more times
        // (useful when you don't know the size of your data, eg. stream)
        md.update(unencodedPassword);
        // now calculate the hash
        byte[] encodedPassword = md.digest();
        StringBuilder buf = new StringBuilder();
        for (int i = 0; i < encodedPassword.length; i++) {
            if ((encodedPassword[i] & 0xff) < 0x10) {
                buf.append("0");
            }
            buf.append(Long.toString(encodedPassword[i] & 0xff, 16));
        }
        return buf.toString();
    }
}