Salman Moha

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since Jul 19, 2005

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Recent posts by Salman Moha

8- byte array Intialization Vector

Rob Prime wrote:Have you tried the same in Java?

I trying to implement this in java.

private readonly byte[] IV = new byte[8] { 240, 3, 45, 29, 0, 76, 173, 59 };

Here's is my JAVA Code but skeptical about it.

private static byte[] IV = new byte[] { (byte)240, (byte)3, (byte)45,(byte)29, (byte)0, (byte)76, (byte)173, (byte)59 };

Method:
IvParameterSpec zeroIv = new IvParameterSpec(IV, 0, 8)

Please direct me.

15 years ago

Java in General

8- byte array Intialization Vector

Hi there,

I'm working on Triple DES encryption with parameters in JAVA 5:

Key Size : 16 bytes
Key : This is an MD5 hash of the shared key (eg: MD5 hash of omCryptoExchange in this case)
CipherMode : CBC (Cipher Block Chaining)
Padding Mode : PKCS7

How do I create an 8- byte array initialization vector with the following values in it, { 240, 3, 45, 29, 0, 76, 173, 59 } in java.

Equivalent C++ code is

// The Initialization Vector for the DES encryption routine
private readonly byte[] IV = new byte[8] { 240, 3, 45, 29, 0, 76, 173, 59 };

15 years ago

Java in General

Parse special characters: Servlet/xml

Hi experts,
I have this requirement where I need to do implement XOR logic with the following.

Time = decrypt("���������","�����������");
it works fine with alpha numeric like -- decrypt("qr35%&5675","reg345*453"); But not working with special characters like ("���������","�����������");
Here is my decrypt code
private String decrypt(String taCryptText, String taKeyText)
{
int i = 0;
int iCryptLength = 0;
int iCryptTextLength = 0;
int iKeyLength = 0;
int iKeyTextLength = 0;
int iDelta = 0;
int iTemp = 0;
char cTemp = 0;
char cTemp0 = 0;
String sTemp = null;
String sCryptText = null;
String sKeyText = null;
String sPlainText = null;
String taPlainText = null;
StringBuffer sbTemp = null;
int iCrypt[] = null;
int iCryptBuffer[] = null;
int iKey[] = null;
int iKeyBuffer[] = null;
boolean bNumericKey = false;
boolean bNumericCrypt = false;
sCryptText = taCryptText;
sKeyText = taKeyText;
iCryptTextLength = sCryptText.length();
iKeyTextLength = sKeyText.length();
System.out.println("Key is :"+sKeyText);
System.out.println("sCryptText:"+sCryptText);
System.out.println("iKeyTextLength:"+iKeyTextLength);
// Find out if the crypttext is numeric:
if (numericP(iCryptTextLength, sCryptText))
{
bNumericCrypt = true;
System.out.println("The crypt text is numeric.");
// Fill the crypt array:
iCrypt = new int[iCryptTextLength];
// More than enough for the crypt integers.
i = 0;
while (i < iCryptTextLength)
{
cTemp = 0;
sbTemp = new StringBuffer();
while (cTemp != ' ' && i < iCryptTextLength)
{
try
{
cTemp = sCryptText.charAt(i);
}
catch (StringIndexOutOfBoundsException e0)
{
System.out.println("Caught StringIndexOutOfBoundsException in decrypt() (crypt).");
}
if (cTemp != ' ')
{
sbTemp.append(cTemp);
}
i++;
}
iCrypt[iCryptLength] = Integer.parseInt(sbTemp.toString());
iCryptLength++;
}
}
else
{
iCryptLength = iCryptTextLength;
System.out.println("The crypt text is not numeric, iCryptLength = " + iCryptLength + ".");
}
// Find out if the key is numeric:
if (numericP(iKeyTextLength, sKeyText))
{
bNumericKey = true;
System.out.println("The key is numeric.");
// Fill the key array:
iKey = new int[iKeyTextLength];
i = 0;
while (i < iKeyTextLength)
{
cTemp = 0;
sbTemp = new StringBuffer();
while (cTemp != ' ' && i < iKeyTextLength)
{
try
{
cTemp = sKeyText.charAt(i);
}
catch (StringIndexOutOfBoundsException e1)
{
System.out.println("Caught StringIndexOutOfBoundsException in decrypt() (key).");
}
if (cTemp != ' ')
{
sbTemp.append(cTemp);
}
i++;
}
try
{
iTemp = Integer.parseInt(sbTemp.toString());
}
catch (NumberFormatException e1a)
{
System.out.println("Caught NumberFormatException in decrypt() (key).");
break;
}
iKey[iKeyLength] = iTemp;
iKeyLength++;
}
}
else
{
iKeyLength = iKeyTextLength;
System.out.println("The key is not numeric, iKeyLength = " + iKeyLength + ".");
}
if (iCryptLength < iKeyLength)
{
if (bNumericCrypt)
{
System.out.println("Ignoring excess key digits.");
}
else
{
System.out.println("Ignoring excess key characters.");
}
}
else
{
if (iKeyLength < iCryptLength)
{
System.out.println("Key is shorter than crypttext: repeating the key.");
// lblMessage.setText("Key is shorter than crypttext: repeating the key.");
if (bNumericKey)
{
// Repeat the key as necessary to make it long enough.
iKeyBuffer = new int[iKeyLength]; // Need to stash the key characters someplace
for (i = 0; i < iKeyLength; i++) // while we get more memory for the array.
{
iKeyBuffer[i] = iKey[i];
}
iKey = new int[iCryptLength]; // Expand the key array.
for (i = 0; i < iKeyLength; i++)
{
iKey[i] = iKeyBuffer[i];
}
for (i = iKeyLength; i < iCryptLength; i++)
{
iKey[i] = iKey[i - iKeyLength];
}
}
else
{
sbTemp = new StringBuffer(sKeyText);
for (i = iKeyLength; i < iCryptLength; i++)
{
try
{
cTemp = sbTemp.charAt(i - iKeyLength);
}
catch (StringIndexOutOfBoundsException e2)
{
System.out.println("Caught StringIndexOutOfBoundsException in decrypt() (e2).");
}
sbTemp.append(cTemp);
}
sKeyText = sbTemp.toString();
iKeyLength = sKeyText.length();
}
}
else
{
// They are equal in length, do nothing.
}
}
// Begin the decryption.
sbTemp = new StringBuffer();
for (i = 0; i < iCryptLength; i++)
{
if (bNumericKey)
{
if (bNumericCrypt)
{
iTemp = iCrypt[i] ^ iKey[i];
}
else
{
try
{
cTemp = sCryptText.charAt(i);
}
catch (StringIndexOutOfBoundsException e3)
{
System.out.println("Caught StringIndexOutOfBoundsException in decrypt() (e3).");
}
iTemp = cTemp ^ iKey[i];
}
}
else
{
if (bNumericCrypt)
{
try
{
cTemp = sKeyText.charAt(i);
}
catch (StringIndexOutOfBoundsException e4)
{
System.out.println("Caught StringIndexOutOfBoundsException in decrypt() (e4).");
}
iTemp = iCrypt[i] ^ cTemp;
}
else
{
try
{
cTemp = sCryptText.charAt(i);
cTemp0 = sKeyText.charAt(i);
}
catch (StringIndexOutOfBoundsException e5)
{
System.out.println("Caught StringIndexOutOfBoundsException in decrypt() (e5) , i = " + i + ".");
}
iTemp = cTemp ^ cTemp0;
}
}
sbTemp.append((char) iTemp);
}
sTemp = sbTemp.toString();
System.out.println("sTemp " + sTemp );
if (unprintableP(iCryptLength, sTemp))
{
System.out.println("Unprintable decrypted text, writing " + iCryptLength + " characters as numeric code.");
//lblMessage.setText("Unprintable decrypted text, writing " + iCryptLength + " characters as numeric code.");
sbTemp = new StringBuffer();
for (i = 0; i < iCryptLength; i++)
{
try
{
iTemp = sTemp.charAt(i);
}
catch (StringIndexOutOfBoundsException e6)
{
System.out.println("Caught StringIndexOutOfBoundsException in decrypt() (e6).");
}
if (i == iCryptLength - 1)
{
sbTemp.append(iTemp);
}
else
{
sbTemp.append(iTemp + " ");
}
}
taPlainText=sbTemp.toString();
}
else
{
System.out.println("Printable decrypted text, writing " + iCryptLength + " characters.");
// lblMessage.setText("Printable decrypted text, writing " + iCryptLength + " characters.");
taPlainText=sTemp;
}
return taPlainText;
}
boolean numericP(int iTextLength, String sText)
{
boolean r = true;
int i = 0;
char cTemp = 0;
int iRunLength = 0;
int iMaxRunLength = 0;
for (i = 0; i < iTextLength; i++)
{
try
{
cTemp = sText.charAt(i);
}
catch (StringIndexOutOfBoundsException e7)
{
System.out.println("Caught StringIndexOutOfBoundsException in decrypt() (e7).");
}
if (cTemp != ' ')
{
if (cTemp < 48 || cTemp > 57)
{
r = false;
break; // Break out of for loop.
}
else
{
if (cTemp > 47 && cTemp < 58)
{
// We have a decimal digit.
iRunLength++;
}
}
}
else
{
// We have a space: // Detect delimiting spaces
if (iRunLength > iMaxRunLength)
{
iMaxRunLength = iRunLength;
}
iRunLength = 0;
}
} // End of for.
if (iRunLength > iMaxRunLength) // Catch the case where the space
{ // comes at the end of the string.
iMaxRunLength = iRunLength;
}
if (iMaxRunLength > 3) // It's not text that happens to to be
{ // a string (or strings) of digits.
r = false;
}
return r;
}
boolean unprintableP(int iLength, String sText)
{
boolean r = false;
int i = 0;
char cTemp = 0;
for (i = 0; i < iLength; i++)
{
try
{
cTemp = sText.charAt(i);
}
catch (StringIndexOutOfBoundsException e8)
{
System.out.println("Caught StringIndexOutOfBoundsException in decrypt() (e8).");
}
if (cTemp < 32 || cTemp == 127)
{
if (cTemp != 9 && cTemp != 10 && cTemp != 12 && cTemp != 13)
{
r = true;
System.out.println("Unprintable on character " + (int) cTemp);
break; // Break out of for loop.
}
}
}
return r;
}

Experts please let me know how to handle special characters in this decrypt method.

16 years ago

Java in General

Online store

I want to design a store which has catalog (products from different manufacturers), display them. navigate them.

What is the best technology out there ? Any out of box?

thanks

17 years ago

Servlets

how to open word from java application

hi there

I have an application where in the jsp page, i provide to link to OPEN a word file upload in the server. I am using <a href tag. its working good on the local machine. but when i am connecting to the server which is secured (https) its not opening.

could you help.

19 years ago

Servlets

CANNOT download file from https in IE 6

Hi there.

Its working well with the firefox browser. I checked out without XP firewall.

When I click the link to open/ download a word file, its showing the (File Download warning) content disposition window but when I click save or open,,, I get error message "Internet Explorer cannot download ...File_name.doc from Server_name.
Internet Explorer was not able to open this Internet site. The requested site is either unavailable or cannot be found. Please try again later. "

In the content disposition window ( file download warning window), "File Name" is the filename path, and "From" is the server name/path. but nothing is displayed in "File Type"! Hope this might have something to do. Please help me out.

My code is as follows
if (!request.getScheme().equals("https"))
response.setHeader("Pragma", "no-cache");

String fileName=request.getParameter("instruction");
//filename = filename.replaceAll( "\\W*", "" ) ;
String DirName = request.getParameter("directory");
String value = (DirName+"/"+fileName);

File f = new File (value);
response.setContentType("application/msword");
//set the header and also the Name by which user will be prompted to save
response.setHeader("Content-disposition", "attachment; filename=" + fileName);
response.setHeader("Cache-Control", "cache");
response.setHeader("Cache-Control", "must-revalidate");
InputStream in = new FileInputStream(f);
out.clearBuffer();

int bit = 256;
int i = 0;

try {

while ((bit) >= 0) {
bit = in.read();

out.write(bit);
}

} catch (IOException ioe) {
ioe.printStackTrace(System.out);
}

out.flush();
out.close();
in.close();

19 years ago

Servlets

CANNOT download file from https in IE 6

I have a similar problem. When I am trying to save/open a file from server(secure) which uses HTTPS, its displaying error message:

Internet Explorer cannot download ...File_name.doc from Server_name.
Internet Explorer was not able to open this Internet site. The requested site is either unavailable or cannot be found. Please try again later.

My code is below. Please help me out.
Its working with my localhost(http) and with Firefix browser. Its something to do with http and IE 6.

<java>
if (!request.getScheme().equals("https"))
response.setHeader("Pragma", "no-cache");

String fileName=request.getParameter("instruction");
//filename = filename.replaceAll( "\\W*", "" ) ;
String DirName = request.getParameter("directory");
String value = (DirName+"/"+fileName);

File f = new File (value);
response.setContentType("application/msword");
//set the header and also the Name by which user will be prompted to save
response.setHeader("Content-disposition", "attachment; filename=" + fileName);

InputStream in = new FileInputStream(f);
out.clearBuffer();

int bit = 256;
int i = 0;

try {

while ((bit) >= 0) {
bit = in.read();

out.write(bit);
}

} catch (IOException ioe) {
ioe.printStackTrace(System.out);
}

out.flush();
out.close();
in.close();
</java>

19 years ago

Servlets

No javascript for child windows.

Thank So much all.

I was wondering if there is any method or class which one can write in a formhandler or somewhere (.java) to close a browser.

Anyways if i cannot use javascript then it leaves me no other options

19 years ago

HTML Pages with CSS and JavaScript

No javascript for child windows.

Hi

HI THERE!

I am working on a web application where I am using parent/child windows. My application has one main window and some buttons like for adding new record, modifying new record etc. When user clicks on any button a child window opens where user enters data and upon clicking save/update button there, the page gets submitted within the child window giving him message whether save/update is successful or not. Now when he closes the child window I would like to refresh the parent window which maintains list of added records. Note that child window is not a modal window and resubmission of page is happening within the window.

I am not allowed to use any sort of JAVASCRIPT that keeps in trance.
Please help.
I have to use a formhandler to check in the form data in child window too.

19 years ago

Beginning Java

No javascript for child windows.

19 years ago

JSP

No javascript for child windows.

Hi

I am working on a web application where I am using parent/child windows. My application has one main window and some buttons like for adding new record, modifying new record etc. When user clicks on any button a child window opens where user enters data and upon clicking save/update button there, the page gets submitted within the child window giving him message whether save/update is successful or not. Now when he closes the child window I would like to refresh the parent window which maintains list of added records. Note that child window is not a modal window and resubmission of page is happening within the window.

I am not allowed to use any sort of JAVASCRIPT that keeps in trance.
Please help

19 years ago

HTML Pages with CSS and JavaScript