SHA Alogorithm in Java

import java.security.MessageDigest;

public class Util {
    public static String getSHA(String text)throws Exception{
        MessageDigest md;
        md = MessageDigest.getInstance("SHA-1");
        md.update(text.getBytes("iso-8859-1"), 0, text.length());
        return convertToHex(md.digest());
    }
    private static String convertToHex(byte[] data) {
            StringBuffer buf = new StringBuffer();
            for (int i = 0; i < data.length; i++) {
                int halfbyte = (data[i] >>> 4) & 0x0F;
                int two_halfs = 0;
                do {
                    if ((0 <= halfbyte) && (halfbyte <= 9))
                        buf.append((char) ('0' + halfbyte));
                    else
                        buf.append((char) ('a' + (halfbyte - 10)));
                    halfbyte = data[i] & 0x0F;
                } while(two_halfs++ < 1);
            }
            return buf.toString();
    }
   
    public static void main(String[] args) throws Exception {
        System.out.println(Util.getSHA("Vinay Guntaka"));
       
    }
   
}