MD5加密

MD5加密

public static final synchronized String hash(String s)
    {
        if(digest == null)
            try
            {
                digest = MessageDigest.getInstance("MD5");
            }
            catch(NoSuchAlgorithmException nosuchalgorithmexception)
            {
                System.err.println("Failed to load the MD5 MessageDigest. Jive will be unable to function normally.");
                nosuchalgorithmexception.printStackTrace();
            }
        digest.update(s.getBytes());
        return encodeHex(digest.digest());
    }

    public static final String encodeHex(byte abyte0[])
    {
        StringBuffer stringbuffer = new StringBuffer(abyte0.length * 2);
        for(int i = 0; i < abyte0.length; i++)
        {
            if((abyte0[i] & 0xff) < 16)
                stringbuffer.append("0");
            stringbuffer.append(Long.toString(abyte0[i] & 0xff, 16));
        }

        return stringbuffer.toString();
    }

    public static final byte[] decodeHex(String s)
    {
        char ac[] = s.toCharArray();
        byte abyte0[] = new byte[ac.length / 2];
        int i = 0;
        for(int j = 0; j < ac.length; j += 2)
        {
            byte byte0 = 0;
            byte0 |= hexCharToByte(ac[j]);
            byte0 <<= 4;
            byte0 |= hexCharToByte(ac[j + 1]);
            abyte0[i] = byte0;
            i++;
        }

        return abyte0;
    }