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/*
* Created on Mar 1, 2004
* Algorithm:
* Copyright (c) 2004 David Hammerton
*
* port to java:
* Copyright (c) 2004 Joseph Barnett
*/
package itunes.util;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* @author jbarnett
*/
public class Hasher {
//taken from calculations in libopendaap
//private static String staticHash = "98814088228B81E0AB021433618EC27B";
private static String calcHash = "";
private static boolean staticCalculated = false;
private static final String hexchars = "0123456789ABCDEF";
private static final String appleCopyright = "Copyright 2003 Apple Computer, Inc.";
private static MessageDigest md;
private static final int HASH_SIZE = 32;
static {
try {
md = MessageDigest.getInstance("md5");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
}
private static String DigestToString(byte[] digest)
{
String string="";
int i;
for (i = 0; i < digest.length; i++)
{
byte tmp = digest[i];
string += hexchars.charAt((tmp >> 4) & 0x0f);
string += hexchars.charAt(tmp & 0x0f);
}
return string;
}
private static synchronized void calculateStaticHash() {
if (staticCalculated)
return;
for (int i = 0; i < 256; i++) {
if ((i & 0x80) != 0)
md.update("Accept-Language".getBytes());
else
md.update("user-agent".getBytes());
if ((i & 0x40) != 0)
md.update("max-age".getBytes());
else
md.update("Authorization".getBytes());
if ((i & 0x20) != 0)
md.update("Client-DAAP-Version".getBytes());
else
md.update("Accept-Encoding".getBytes());
if ((i & 0x10) != 0)
md.update("daap.protocolversion".getBytes());
else
md.update("daap.songartist".getBytes());
if ((i & 0x08) != 0)
md.update("daap.songcomposer".getBytes());
else
md.update("daap.songdatemodified".getBytes());
if ((i & 0x04) != 0)
md.update("daap.songdiscnumber".getBytes());
else
md.update("daap.songdisabled".getBytes());
if ((i & 0x02) != 0)
md.update("playlist-item-spec".getBytes());
else
md.update("revision-number".getBytes());
if ((i & 0x01) != 0)
md.update("session-id".getBytes());
else
md.update("content-codes".getBytes());
String newHash =DigestToString(md.digest());
calcHash += newHash;
}
staticCalculated = true;
}
public static String GenerateHash(String url, int accessIndex) {
int start = HASH_SIZE * accessIndex;
int end = start + HASH_SIZE;
calculateStaticHash();
md.update(url.getBytes());
md.update(appleCopyright.getBytes());
md.update(calcHash.substring(start, end).getBytes());
return DigestToString(md.digest());
}
}
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