算法问题：这段程序如何加密的？
//有无办法写个算号器？
public class ASTPrimaryCheck
{
private static final String DT = "dt ";
private static final String PK = "pk ";
private static final String USER = "us ";
private static final String TRY_LABEL = "Try FDT ";
private static final String EXPIRED_LABEL = "Use Restricted ";
private static boolean valid = true;
private static boolean checked = false;
public ASTPrimaryCheck()
{
}
public static void check()
{
if (checked)
return;
checked = true;
if (hasSerial())
{
checkSerial();
return;
}
String pd = FDTUIPlugin.getPluginDirectory();
File f = new File((new StringBuilder(String.valueOf(pd))).append( "icons/imageIndexByte ").toString());
boolean hasDate = hasInstallDate();
if (!f.exists() && !hasDate)
{
valid = false;
openDialog(getTimeUpText(), "Use Restricted ");
return;
}
if (f.exists())
f.delete();
long installDate = -1L;
if (hasDate)
installDate = getInstallDate();
else
installDate = createInstallData();
if (installDate == -1L)
{
valid = false;
openDialog(getTimeUpText(), "Use Restricted ");
return;
}
long currentDate = System.currentTimeMillis();
long diff = currentDate - installDate;
long diffDay = diff / 1000L / 60L / 60L / 24L;
long daysLeft = 30L - diffDay;
if (daysLeft > 30L || installDate == -2L || daysLeft <= 0L)
{
ConfigurationSupport.storeObject( "dt ", new Long(-2L));
valid = false;
openDialog(getTimeUpText(), "Use Restricted ");
} else
{
openDialog(getTimeLeftText(daysLeft), "Try FDT ");
}
}
public static boolean isValid()
{
return valid;
}
public static boolean storeKey(String userName, String key)
{
if (!ConfigurationSupport.storeObject( "us ", userName))
return false;
if (!ConfigurationSupport.storeObject( "pk ", key))
{
return false;
} else
{
valid = true;
return true;
}
}
private static boolean hasSerial()
{
return ConfigurationSupport.hasObject( "us ") && ConfigurationSupport.hasObject( "pk ");
}
private static void checkSerial()
{
try
{
String key = (String)ConfigurationSupport.readObject( "pk ");
String user = (String)ConfigurationSupport.readObject( "us ");
prowv(user, key);
}
catch (Exception )
{
valid = false;
openDialog(getIllegalKeyText(), "Use Restricted ");
}
}
private static long createInstallData()
{
long in_date = System.currentTimeMillis();
ConfigurationSupport.storeObject( "dt ", new Long(in_date));
return getInstallDate();
}
private static long getInstallDate()
{
long result = ((Long)ConfigurationSupport.readObject( "dt ")).longValue();
return result;
JVM INSTR pop ;
return -1L;
}
private static boolean hasInstallDate()
{
return getInstallDate() != -1L;
}
public static void openDialog(final String message, final String label)
{
PlatformUI.getWorkbench().getDisplay().asyncExec(new Runnable() {
private final String val$label;
private final String val$message;
public void run()
{
org.eclipse.swt.widgets.Shell shell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();
StartDialog d = new StartDialog(shell, 0);
d.setOKText(label);
d.open(message);
}
{
label = s;
message = s1;
super();
}
});
}
private static String getTimeLeftText(long daysLeft)
{
return (new StringBuilder( "Thank you for testing FDT.\n\nYou have ")).append(daysLeft).append( " days left to test FDT.\nAfter that time FDT will run restricted.\n\nVisit the FDT Website at http://fdt.powerflasher.com\nto get more information on how to get a FDT Product Key. ").toString();
}
private static String getTimeUpText()
{
return "The FDT Trial is expired.\n\nFDT will run in restrict mode now.\nPlease enter a FDT Product key.\n\nVisit the FDT Website at http://fdt.powerflasher.com\nto get more information on how to get a FDT Product Key. ";
}
private static String getIllegalKeyText()
{
return "The found FDT product Key is not valid.\nFDT will run in restrict mode now.\nPlease enter the FDT Product key again.\nThis problem may occure when the eclipse folder location has changed. ";
}
public static void prowv(String pn, String pk)
throws Exception
{
int l = pk.length();
char s[] = pk.toCharArray();
String vars[] = new String[l];
for (int i = 0; i < l; i++)
vars[i] = " ";
for (int i = 0; i < l; i++)
{
for (int y = 0; y < l; y++)
vars[y] = (new StringBuilder(String.valueOf(s[y]))).append(vars[y]).toString();
Arrays.sort(vars);
}
for (int i = 0; i < l; i++)
if (vars[i].charAt(l - 1) == 'z ')
pk = vars[i].substring(0, l - 1);
l = pk.length() / 2;
byte id[] = new byte[l];
int j = 0;
for (int i = 0; i < l; i++)
{
char c = pk.charAt(j++);
int sp = c < '0 ' || c > '9 ' ? c < 'a ' || c > 'z ' ? (c - 65 & 7) + 10 : (c - 97 & 7) + 10 : c - 48;
c = pk.charAt(j++);
int kp = c < '0 ' || c > '9 ' ? c < 'a ' || c > 'z ' ? (c - 65 & 7) + 10 : (c - 97 & 7) + 10 : c - 48;
id[i] = (byte)(sp < < 4 | kp);
}
j = 0;
for (int i = 0; i < 27; i++)
if (i < 5 || i > 8)
id[i] ^= id[j++ % 4 + 5];
byte prod = 0;
for (int i = 0; i < 26; i++)
prod ^= id[i];
if (prod != id[26])
throw new Exception( " ");
String dis = (new StringBuilder( "xz874hfdu ")).append(pn).toString();
byte di[] = dis.getBytes( "utf-8 ");
MessageDigest md5 = MessageDigest.getInstance( "MD5 ");
di[0] = id[5];
di[1] = id[6];
di[2] = id[7];
di[3] = id[8];
byte kd2[] = md5.digest(di);
for (int i = 0; i < 5; i++)
if (id[i] != kd2[i])
throw new Exception( "key error ");
}
}
[解决办法]
看了一下，发表一下观后感：真是……………………长！
[解决办法]
看来我还要多学习 只看懂一部分.如果有谁会写请再发一版让我学习学习.
[解决办法]
这段代码是干什么的？
[解决办法]
刚起步~`看不太懂`~
------解决方案--------------------
1.5版本的，本人已经写出的keygen.
3.0 的现在搞不明白了。
