source: 3thparty/jmessenger/src/nu/fw/jeti/util/Digest.java @ 3952

/**
 * @author Alexandre Correia - alexandrecorreia@celepar.pr.gov.br
 * @ Calculo do hash para autenticacao Digest
 */
package nu.fw.jeti.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Digest
{
        private byte[] gHash(String frase, String algoritmo)
        {
                try
                {
                        MessageDigest md = MessageDigest.getInstance(algoritmo);
                        md.update(frase.getBytes());
                        return md.digest();
                }
                catch (NoSuchAlgorithmException e)
                {
                        return null;
                }
        }
        
        private String stringHexa(byte[] bytes)
        {
                StringBuilder s = new StringBuilder();
                for (int i = 0; i < bytes.length; i++)
                {
                        int parteAlta = ((bytes[i] >> 4) & 0xf) << 4;
                        int parteBaixa = bytes[i] & 0xf;
                        if (parteAlta == 0) s.append('0');
                        s.append(Integer.toHexString(parteAlta | parteBaixa));
                }
                
                return s.toString();
        }

        public String hashMD5(String nonce, String cnonce, String qop, String uri, String user, String password, String realm)
        {
                String HA1 = stringHexa(gHash( user + ":" + realm + ":" + password, "MD5"));
                String nc = "00000001";
                String HA2 = stringHexa(gHash(uri, "MD5"));
                String DigestPROXY = HA1 + ":" + nonce + ":" + nc + ":" + cnonce + ":" + qop + ":" + HA2;

                return stringHexa(gHash(DigestPROXY, "MD5"));
        }
}