Java signed and VB6 unsigned

Hello everyone
I know I made 2 posts in the past few days about this problem, but at that time, I wasn't sure this IS the problem or some other issues I might not know about. So the posts were very confusing. I thought I might make this new one to simplify things.
A quick overview, I need to convert a VB6 client to Java. The server is in VB6 and I can't modify its code. So no access. I do have the source code and the working version of the VB6 client however.
The problem I have is how to pass byte value more then 127 to the VB server. Java use signed byte (-127 to 127) while VB uses unsigned. Using packet sniffing program (Ethereal), I know the VB6 client is passing bytes values 0x85, 0x9E to the server, while my Java client (in doing exact same thing) can only pass value 0x3F 0x3F instead. Anything below 127 (i.e alphabetical letters) is the same between the 2 of program.
So my question is how one can pass signed Java bytes into VB6 unsigned bytes. I did some search on google and found this
http://www.javaworld.com/javaforums/showflat.php?Cat=&Board=javabeginner&Number=9208&page=15&view=collapsed&sb=7&o=&fpart=1
but still didn't help me. I still only can pass bytes below 127.
Any help is appreciate. Thank you in advance!

To understand how things work you have to distinguish between the "bits in the byte", which can vary between 0x00 and 0xff in Java as well as in VB, and the interpretation of these bits, which is different.
While 0xff might be interpreted as 255 in VB, it is a -1 in Java.
So if you want to send the byte value 0x85, just write e.g.
byte by = (byte)0x85;and the byte will contain the correct bits. You can also use casting from an int or short and it will give correct results:
int i = 255;
byte by = (byte)i;will leave by with 0xff.
In the other direction, you might consider converting your bytes to short or int. In this case you have to handle the negative values explicitly, e.g.
byte by = (byte)0x85; // you might have received this value from VB
int i = by & 0xff;leaves the variable i with the value of 133.

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How to pass Java signed byte into VB6 unsigned program

Hello everyone
I need to build a client in Java to talk to a VB6 server. I am the point to pass the encrypt username and password into the server. The VB6 code for the encryption is
Crypt = Crypt & Chr(Asc(Mid$(Text, Len(Text) - X + 1, 1)) Xor &HA3)
My Java code is
cryptOutput = cryptOutput + ((char)(((int) input.charAt(i)) ^ ((byte)0xa3)));
The server doesn't seem to understand my username and password. I highly suspect the reason being that Java byte is signed and VB6 is unsigned.
How could I overcome this problem? I did some research and things like &0xFF didnt help...
Thank you in advance!

A bit more information about my problem
The server uses Crypt function to encode or decode all the strings sent or received
Public Function Crypt(ByVal Text As String) As String
    Dim X As Integer
    For X = 1 To Len(Text)
        Crypt = Crypt & Chr(Asc(Mid$(Text, Len(Text) - X + 1, 1)) Xor &HA2)
    Next X
End FunctionIf you run Crypt(Crypt("0123")), you should get "0123" in return
What I need to to make the same encode/decode function on my client side to be exactly the same as the server side. My java code for it is
public static String crypt(String input)
        int i = 0;
        int len = input.length();
        int a2 = 0xa2; // variable used in original VB code for encoding
        String cryptOutput = new String("");
        for (i = 0; i < input.length(); i++)
            cryptOutput = cryptOutput + ((char)(((byte)input.charAt(len-i-1)) ^ ((byte)a5)));
        return cryptOutput;
    }My java crypt(crypt("0123")) can also return "0123", but the result between crypt("0123") and Crypt("0123") is different. Maybe thats why the server can't authenticate the password I send it. (I use Java Socket class, while the server uses Winsock).
I can already pass un-encrypt data (i.e string like "hello") successfully between the client and the server. But with encrypt data, I have no success :(
I really think it's because of the byte differences between Java and VB6. Please point out my error :)
Thank you for your time!

Why signed and get "access denied (java.io.FilePermission hello.txt read)"?

I am learning the Java tools and policy to create some local browser application for personal use. So I signed a jar file with jarsigner, keytool and policytool and still trying to figure out why my browser application cannot read a simple local text file.
My question are
1. Why use java policy tool (policytool.exe)? If I signed a .jar with keytool and jarsigner, do I really need java policytool to write a policy?
2. What is the maximum validity days? 365? or more? Do I need to sign again when validity expire?
3. I don't want any of my local browser application gets to internet but only work with local files (read, write, or execute). how do I do that?
4. how to use java security policy to grant access to the jar applet? where do I place and import the policy file so the hosting web browser and the applet can work?
My java applet is a simple class that read a text line from a local file in the same folder, and pass the result to a calling web browser Javascript.
Currently the result in the web page is the error message below, even though the jar is signed correctly.
access denied (java.io.FilePermission hello.txt read)
Someone please help and enlight the newbie!

leoku wrote:
I am learning the Java tools and policy to create some local browser application for personal use.Why would you wrap a mostly useless and unhelpful browser window around a Java app. for 'local' use?
.. So I signed a jar file with jarsigner, keytool and policytool and still trying to figure out why my browser application cannot read a simple local text file.
My question are
1. Why use java policy tool (policytool.exe)? If I signed a .jar with keytool and jarsigner, do I really need java policytool to write a policy?No. In fact, don't stuff around with policy files - they are a path to madness.
2. What is the maximum validity days? 365? or more?Keytool accepts an argument for the number of days to remain valid. I do not believe it has an upper limit, but it might be best to experiment with it and find out for yourself. Please report your findings back.
(2a) Do I need to sign again when validity expire?No, but the end user gets a huge warning that the certificate has expired. Further, if it was a certificate that was certified by a CA, the 'always trust' check box which used to default to true, would now default to false.
3. I don't want any of my local browser application gets to internet but only work with local files (read, write, or execute). how do I do that?I am not sure I understand, but if you only offer a JFileChooser for the applet to access resources, that should restrict it to resources off the local file-system. Of course, that would not restrict the end user from downloading something from the internet to their local disks, then accessing it using the applet.
4. how to use java security policy to grant access to the jar applet? where do I place and import the policy file so the hosting web browser and the applet can work?The only place it will work is in the JRE directories of the end-user's machine. Even if you find a way to install your local policy file, do not go messing with the end-user's policy files.
My java applet is a simple class that read a text line from a local file in the same folder,.. In the 'same folder' as what? (1)
..and pass the result to a calling web browser Javascript. That might be the problem. AFAIR, using JS with trusted applets causes the security to be tightened. Perhaps it could be fixed by calling System.setSecurityManager(null) on applet init(), but I have also seen references to using [AccessController.doPrivileged()|http://java.sun.com/j2se/1.4.2/docs/api/java/security/AccessController.html] to wrap the problematic code. I am hazy on the details of how/if that works.
Currently the result in the web page is the error message below, even though the jar is signed correctly.
access denied (java.io.FilePermission hello.txt read)
1) If the answer to my question is what I suspect, there may be better ways to access the resource that are usable even in a sand-boxed app.

Signed and unsigned applet

Hi all,
I want to create an applet that is firstly loaded as a normal (i.e., unsigned) applet. The user can use several features of the applet without seeing a security warning dialog. But when the user uses a certain feature of an applet (such as saving the data to his computer), there will be a security warning dialog that asked the user to allow the (same) applet to access the local harddrive. If the user allows, the applet will be switch to signed mode without having to reload.
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Thank you,
vaxim

It is possible if and only if your using different applets. In the same applet there is no possibility of switching signed and unsigned. But I think you can do this by specifying the certificate name.

Converting unsigned to java signed byte value

Hey ,
i need to use a raw address in a client i am writing but, of course, the address contains a byte outside of the java signed byte range. if any one could tell me what an unsigned byte of 224 in signed java is i would be very grateful, if you could also show how you did this it would be appreciated. thank you =)

Re: Converting unsigned to java signed byte value
i need to use a raw address in a client i am writing
but, of course, the address contains a byte outside
of the java signed byte range.
if any one could tell
me what an unsigned byte of 224 is in signed java
I would be very grateful, if you could also show how
you did this it would be appreciated. thank you =)You misunderstand signed/unsigned.
A byte has 8 bits. It can represent 256 different values.
Viewed as an unsigned scalar the range is [0;255].
Viewed as a signed two's-complement scalar the range is [-128;127].
Values [0;127] are obviously the same byte values in the two views.
What the other half of the possible byte values represent depends on what view you adopt.
You don't need to convert anything.
public final class Byte224 {
    static byte[] byteArray = {
        (byte)224, (byte)'\n'
    public static final void main(final String[] arg) {
        System.out.println("0x"+Integer.toHexString(byteArray[0]&0xff));
        System.out.println(Integer.toString(byteArray[0]&0xff));
}

Signed and unsigned profiles

Using server 3.2.2, and most clients updated to 10.10.
I have created profiles for each user and these get pushed to their computer.
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If I sign into Profiles Manager as admin and download the user profile to then send it through email or put it on a share accessible to the client, that profile will show up as signed on the client machine.
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Thanks.

It is possible if and only if your using different applets. In the same applet there is no possibility of switching signed and unsigned. But I think you can do this by specifying the certificate name.

JVMTI and instrumented unsigned code opens security hole?

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You should also ensure, if you are running Tiger 10.4.11, that you have downloaded and installed the correct version for your Mac of Security Update 2008-001.
As Leopard also uses Safari 3.0.4, much of the above may well also apply to Leopard, but is not guaranteed.

Java Platform and Technologies Take Center Stage at GIDS 2010

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Edited by: wonkim785 on Apr 14, 2010 8:23 AM

Im not sure if this is the right place to post this, but anyway thanks for the info :)

Euro-sign (and Greek) doesn't work even with nchar/nvarchar2

This is something that has been blocking me for a few days now, and I'm running out of ideas.
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Well, the person there used a varchar2, whereas I'm using an nvarchar2. I understand that you need the right codepage and such between the client and the database if you use varchar2, which is exactly the reason why I used the nvarchar2.
However, if I call the function from /Java/, it does work (I found out just now). But this doesn't explain why SQL Developer and Toad are being difficult, and I'm afraid that, because this function is part of a much bigger application, I'll run into the same problem.
- Peter

HCK signed driver getting unsigned-warning on WinXP

I had my driver certified and signed, via an approved HCK submission, but WinXP (SP3 x86 fully patched) complains it is not signed. What's going on?
As you can below, the driver is signed for WinXP. But installing the driver pops the 'unsigned driver' stop UI.
As you can see below, the CAT is properly signed and the cert is proper and the root exists in the cert Root CA folder.
The install works fine on Win7.

Hi
I suggest mail to [email protected] for gets the answer.
Thanks, Steve

Sample code to sign and verify

Hi,
Those of you who might be following my threads will know that signing and verifying data is proving to be a big problem
on my Java Card. I use JC 2.1.1
Could anyone please post a simple code snippet that signs AND verifies data. Please post code that actually works on your card and is thus tested and proven.
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Hi,
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I am working on a applicaion that can load a message from a third party software.
The message is signed and encrypted and will be sent via https.
My application is running on the Tomcat 5.0.24
And I have certificate from the third party software
However, I don't know **how** to use the certificate to decrypted the message.
For example, do I need to write Java code to decrypted the message or does Tomcat take care of the decryption?
If I need to write the code to decrypted the message, what API I should use?
If Tomcat cares of the decryption, how does it work? Do I need to modify the configuration file and how?
Thanks.

Jenny_Run wrote:
However, I don't know **how** to use the certificate to decrypted the message.You don't use a certificate to decrypt since certificates are public so anyone could decrypt.
As for the rest, the devil is in the detail and you don't give any.

Preventing Java updating and phonong home ?

I have been tasked with upgrading an existing working setup of many machines all with XP & Java 6u45, with new machines running Windows 7 Pro & Java 8. This will be a completely managed setup, which may or may net (depending on deployment) be connected to the Internet and Java versions that are deployed must be fixed and not updated. Currently testing with V8u21.
I have cracked and got working the fact the some of the Java apps, in this closed environment, are not signed or are self signed, and they work fine under Java 8u21.
I have been able to suppress IE 11 preventing "out of data active controls" being disabled and thus can install any version of Java without IE 11 blocking it.
But have not been able to suppress the "java needs updating" dialogue box occurring is say 6 months time.....I moved all the clocks on 6 months, 1 year, 2 years to test this. Java may or may not be updated at a later date, but needs to be fixed at deployment (and any later date system reimaging).
Is there a way to suppress this dialogue box ? In this closed setup, maybe not being connected to the internet and running with non-administrative privileges, there is no way to the upgrade can occur. Also we are using a "stateless" session, so that any changes, like user selecting "later" will be forgotten next reboot and dialogue box reappears. Not very profession in such a controlled environment.
I have tried "deployment.expiration.check.enabled=false" & "deployment.expiration.decision.suppression=false" in deployment.properties file and can see these being copied into the registry by Java, but clearly ignored as the dialogue box comes back....
Any thoughts please, as I don't really want to deploy nice new Windows 7 & IE11 boxes with Java 6u45
regards
Ian

I have been tasked with upgrading an existing working setup of many machines all with XP & Java 6u45, with new machines running Windows 7 Pro & Java 8. This will be a completely managed setup, which may or may net (depending on deployment) be connected to the Internet and Java versions that are deployed must be fixed and not updated. Currently testing with V8u21.
I have cracked and got working the fact the some of the Java apps, in this closed environment, are not signed or are self signed, and they work fine under Java 8u21.
I have been able to suppress IE 11 preventing "out of data active controls" being disabled and thus can install any version of Java without IE 11 blocking it.
But have not been able to suppress the "java needs updating" dialogue box occurring is say 6 months time.....I moved all the clocks on 6 months, 1 year, 2 years to test this. Java may or may not be updated at a later date, but needs to be fixed at deployment (and any later date system reimaging).
Is there a way to suppress this dialogue box ? In this closed setup, maybe not being connected to the internet and running with non-administrative privileges, there is no way to the upgrade can occur. Also we are using a "stateless" session, so that any changes, like user selecting "later" will be forgotten next reboot and dialogue box reappears. Not very profession in such a controlled environment.
I have tried "deployment.expiration.check.enabled=false" & "deployment.expiration.decision.suppression=false" in deployment.properties file and can see these being copied into the registry by Java, but clearly ignored as the dialogue box comes back....
Any thoughts please, as I don't really want to deploy nice new Windows 7 & IE11 boxes with Java 6u45
regards
Ian

Can't see the java sign on the address bar

I need to enable java to see a web page but there is no java sign on the address bar. Something has changed because I used to be able to see the web page before

Hello,
In Firefox 23, as part of an effort to simplify the Firefox options set and protect users from unintentially damaging their Firefox, the option to disable JavaScript was removed from the Firefox Options window.
However, the option to disable JavaScript (Java and Javascript are seperate! see: http://kb.mozillazine.org/JavaScript_is_not_Java) was not removed from Firefox entirely. You can still access it from about:config or by installing an add-on.
'''about:config'''
# In the address bar, type "about:config" (with no quotes), and press Enter.
# Click "I'll be careful, I promise"
# In the search bar, search for "javascript.enabled" (with no quotes).
# Right click the result named "javascript.enabled" and click "Toggle". JavaScript is now disabled.
To Re-enable JavaScript, repeat these steps.
'''Add-ons'''
You can alternatively install an add-on that lets you disable JavaScript, such as
*[https://addons.mozilla.org/firefox/addon/noscript/ No-Script] (to disable JavaScript on a per page basis, as required)
*[https://addons.mozilla.org/firefox/addon/quickjava/ QuickJava] (to easily disable and enable JavaScript, automatic loading of images, and other content)
*[https://addons.mozilla.org/firefox/addon/settingsanity/ SettingSanity] (adds back JavaScript options, including Advanced JavaScript Settings, as well as options for loading images and showing the Tab Bar)
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Java signed and VB6 unsigned

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