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• X509 Certificates, DigitalSignature vs NonRepudiation (C#)

  - by Eyvind

  We have been handed a set of test sertificates on smart cards for developing a solution that requires XML messages to be signed using PKI. Each (physical) smart card seems to have two certificates stored on it. I import them into the Windows certificate store using software supplied by the smart card provider, and then use code resembling the following to iterate over the installed certificates: foreach (X509Certificate2 x509 in CertStore.Certificates) { foreach (X509Extension extension in x509.Extensions) { if (extension.Oid.Value == "one we are interested in") { X509KeyUsageExtension ext = (X509KeyUsageExtension)extension; if ((ext.KeyUsages & X509KeyUsageFlags.DigitalSignature) != X509KeyUsageFlags.None) { // process certs here We have been told to use the certificates that have the NonRepudiation key usage flag set to sign the XMLs. However, the certificate that has the NonRepudiation flag has this flag only, and not for instance the DigitalSignature flag which I check for above. Does this strike anyone but me as slightly odd? I am in other words told to sign with a certificate that does not (appear to) have the DigitalSignature usage flag set. Is this normal procedure? Any comments? Thanks.

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• how to read user input from custom dialog in android?

  - by urobo

  I'd like to use a custom dialog built over an AlterDialog to obtain login info from the user. In this manner I first use the layoutinflater to get the layout and then put it in the AlertDialog.Builder.setView() method. LayoutInflater inflater = (LayoutInflater) Home.this.getSystemService(LAYOUT_INFLATER_SERVICE); layoutLogin = inflater.inflate(R.layout.login,(ViewGroup) findViewById(R.id.rl)); My layout consists of two textview and two editext for username and password respectively. Then I override the onCreateDialog method, checking the dialog id and putting all together, during the building phase I use the setButton(...) method to add a confirmation Button, neutral though: /* (non-Javadoc) * @see android.app.Activity#onCreateDialog(int) */ @Override protected Dialog onCreateDialog(int id) { AlertDialog d = null; AlertDialog.Builder builder = new AlertDialog.Builder(this); switch(id){ ... case Home.DIALOG_LOGIN: builder.setView(layoutLogin); builder.setMessage("Sign in to your DyCaPo Account").setCancelable(false); d=builder.create(); d.setTitle("Login"); Message msg = new Message(); msg.setTarget(Home.this.handleLogin); d.setButton(Dialog.BUTTON_NEUTRAL,"Sign in",msg); break; ... } return d; } Then I setup the Handler handleLogin: private Handler handleLogin= new Handler(){ /* (non-Javadoc) * @see android.os.Handler#handleMessage(android.os.Message) */ @Override public void handleMessage(Message msg) { String input = usernameInput.getText().toString(); //this should hold the EditText field for the username } }; which is just a stub up to now. what I don't get is when and where I have to access the two fields since I tried to save a reference to them but unfortunately I always get a null pointer exception. Can anyone tell me what I do wrong and give some guidelines to work with custom dialogs. Thanks in advance! :)

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• Log in using Java where server's authentication could be sso or web applcation container's basic

  - by Ed

  Hi, I have a situation where ideally I want to be able to log-in to a secure area using a Java application. I would like to make an HTTP request and check the response to see if I need to do some kind of authenication before I can actually get the response expected, instead of effectively some login page. The complication is that the server that responds will not always be the same - the user of the Java app specifies the URL - and the server may be using some kind of single sign on authentication or the web container's. I don't know the field names for the username and password fields or the action of the form, is there a simple way to obtain this kind of information from the URL? I see the URLConnection object has methods getPermission() which has a method getActions() but are not suitable, anything that might be? I guess example things I am looking to determine: Does the response require authentication? If so; what type / which servlet? e.g. j_security_check, josso single sign on, ... And then some way of authenticating the client And finally managing the state of the authenticated user for other requests Do I need to know the attributes of the login form before attemping to login? And then, is the onoly way of verifying permission to the requested resource to manually manage the cookies? Thanks in advance.

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• How to replace openSSL calls with C# code?

  - by fonix232

  Hey there again! Today I ran into a problem when I was making a new theme creator for chrome. As you may know, Chrome uses a "new" file format, called CRX, to manage it's plugins and themes. It is a basic zip file, but a bit modified: "Cr24" + derkey + signature + zipFile And here comes the problem. There are only two CRX creators, written in Ruby or Python. I don't know neither language too much (had some basic experience in Python though, but mostly with PyS60), so I would like to ask you to help me convert this python app to a C# code that doesn't depend on external programs. Also, here is the source of crxmake.py: #!/usr/bin/python # Cribbed from http://github.com/Constellation/crxmake/blob/master/lib/crxmake.rb # and http://src.chromium.org/viewvc/chrome/trunk/src/chrome/tools/extensions/chromium_extension.py?revision=14872&content-type=text/plain&pathrev=14872 # from: http://grack.com/blog/2009/11/09/packing-chrome-extensions-in-python/ import sys from array import * from subprocess import * import os import tempfile def main(argv): arg0,dir,key,output = argv # zip up the directory input = dir + ".zip" if not os.path.exists(input): os.system("cd %(dir)s; zip -r ../%(input)s . -x '.svn/*'" % locals()) else: print "'%s' already exists using it" % input # Sign the zip file with the private key in PEM format signature = Popen(["openssl", "sha1", "-sign", key, input], stdout=PIPE).stdout.read(); # Convert the PEM key to DER (and extract the public form) for inclusion in the CRX header derkey = Popen(["openssl", "rsa", "-pubout", "-inform", "PEM", "-outform", "DER", "-in", key], stdout=PIPE).stdout.read(); out=open(output, "wb"); out.write("Cr24") # Extension file magic number header = array("l"); header.append(2); # Version 2 header.append(len(derkey)); header.append(len(signature)); header.tofile(out); out.write(derkey) out.write(signature) out.write(open(input).read()) os.unlink(input) print "Done." if __name__ == '__main__': main(sys.argv) Please could you help me?

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• PDF parsing file trailer

  - by Ralph

  It is not clear from the PDF ISO standard document (PDF32000-2008) whether a comment may follow the startxref keyword: startxref Byte_offset_of_last_cross-reference_section %%EOF The standard does seem to imply that comments may appear anywhere: 7.2.3 Comments Any occurrence of the PERCENT SIGN (25h) outside a string or stream introduces a comment. The comment consists of all characters after the PERCENT SIGN and up to but not including the end of the line, including regular, delimiter, SPACE (20h), and HORZONTAL TAB characters (09h). A conforming reader shall ignore comments, and treat them as single white-space characters. That is, a comment separates the token preceding it from the one following it. EXAMPLE The PDF fragment in this example is syntactically equivalent to just the tokens abc and 123. abc% comment ( /%) blah blah blah 123 Comments (other than the %PDF–n.m and %%EOF comments described in 7.5, "File Structure") have no semantics. They are not necessarily preserved by applications that edit PDF files. If they are allowed to appear after the startxref, parsing the file becomes more difficult because you do not know how far to back up from the %%EOF comment to start parsing to find the byte offset. Any ideas?

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• Percent-Encoded Percent in URI

  - by Lukas

  In our application, it is possible for a user to upload files then download them later. We don't restrict them from having any special characters in the file name. The problem comes in when we create the link for the user to download the file. I use the Java URL encoder to encode the file name that gets put into the href of the link, but I'm still having problems with percent (%) signs. For example, if the user uploads a file named fi%le.jpg, the href that gets generated is fi%25le.jpg, and everything is fine. The problem is when the percent sign is right before the period (i.e., file%.jpg, which gets converted to file%25.jpg). When the user clicks on the link, they get a 404 (Not Found) error. The strange thing is that it is not a problem if the two characters following the percent sign are hex characters.... Weird, eh? Any help is appreciated. I am using Tomcat/Struts. Could the built-in URL decoder have anything to do with this problem?

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• Proxy doesn't work in HttpClient 4.0 beta2

  - by shrimpy

  Hi,i am useing HttpClient 4.0-beta2, to do rest call, it works fine in my lap-top, but in uni, we have to config our application to go through a proxy, otherwise, we cannot connect to internet Here is my orginal code: HttpClient httpclient = new DefaultHttpClient(); HttpPut put = new HttpPut("http://" + PutBlob.ACCOUNT + ".blob.core.windows.net/container/abc"); put.addHeader(PutBlob.ContentType, PutBlob.CONTENT_TYPE.TEXT_PLAIN.getValue()); put.setEntity(new StringEntity("Hello world", "UTF-8")); Sign(put, PutBlob.ACCOUNT, PutBlob.KEY); log.debug(EntityUtils.toString(httpclient.execute(put).getEntity())); And below is how i use proxy, but it didn`t work for me, what is the right way to config proxy in HttpClient4.0 ??? HttpHost hcProxyHost = new HttpHost("proxyserver", 3128, "http"); DefaultHttpClient httpclient = new DefaultHttpClient(); httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, hcProxyHost); HttpPut put = new HttpPut("/container/abc"); put.addHeader(PutBlob.ContentType, PutBlob.CONTENT_TYPE.TEXT_PLAIN.getValue()); put.setEntity(new StringEntity("Hello world", "UTF-8")); Sign(put, PutBlob.ACCOUNT, PutBlob.KEY); HttpHost target = new HttpHost( PutBlob.ACCOUNT + ".blob.core.windows.net"); log.debug(EntityUtils.toString(httpclient.execute(target, put).getEntity()));

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• how to solve the error in GWT ?

  - by megala

  I created one GWT project in eclipse.It contained the following codings Program 1:Creategroup package com.crimson.creategroup; import javax.persistence.Basic; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import com.google.appengine.api.datastore.Key; import com.google.appengine.api.users.User; @Entity(name="CreateGroup") public class Creategroup { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Key key; @Basic private User author; @Basic private String groupname; @Basic private String groupid; @Basic private String groupdesc; @Basic private String emailper; public Key getKey() { return key; } public void setAuthor(User author) { this.author = author; } public User getAuthor() { return author; } public void setGroupname(String groupname) { this.groupname = groupname; } public String getGroupname() { return groupname; } public void setGroupid(String groupid) { this.groupid = groupid; } public String getGroupid() { return groupid; } public void setGroupdesc(String groupdesc) { this.groupdesc = groupdesc; } public String getGroupdesc() { return groupdesc; } public void setEmailper(String emailper) { this.emailper = emailper; } public String getEmailper() { return emailper; } public Creategroup(String groupname,String groupid,String groupdesc ,String emailper) { this.groupname = groupname; this.groupid = groupid; this.groupdesc = groupdesc; this.emailper=emailper; } } Program 2:Creategroupservlet package com.crimson.creategroup; import java.io.IOException; import javax.persistence.EntityManager; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.google.appengine.api.users.User; import com.google.appengine.api.users.UserService; import com.google.appengine.api.users.UserServiceFactory; import java.util.logging.Logger; public class Creategroupservlet extends HttpServlet{ private static final long serialVersionUID = 1L; private static final Logger log = Logger.getLogger(Creategroupservlet.class.getName()); public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException { UserService userService = UserServiceFactory.getUserService(); User user = userService.getCurrentUser(); String groupname=req.getParameter("gname"); String groupid=req.getParameter("groupdesc"); String groupdesc=req.getParameter("gdesc"); String email=req.getParameter("eperm"); if (groupname == null) { System.out.println("Complete all the details"); } if (user != null) { log.info("Greeting posted by user " + user.getNickname() + "\n " + groupname+"\n" + groupid + "\n" + groupdesc + "\n" + email); final EntityManager em = EMF.get(); try { Creategroup group = new Creategroup(groupname,groupid,groupdesc,email); em.persist(group); } finally { em.close(); } } else { throw new IllegalArgumentException("anonymous posts not permitted!"); } resp.sendRedirect("/group.jsp"); } } Program 3:EMF package com.crimson.creategroup; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.Persistence; public class EMF { private static final EntityManagerFactory emfInstance = Persistence.createEntityManagerFactory("transactions-optional"); private EMF() { } public static EntityManager get() { return emfInstance.createEntityManager(); } } Program 4:index.jsp <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@ page import="com.google.appengine.api.users.User" %> <%@ page import="com.google.appengine.api.users.UserService" %> <%@ page import="com.google.appengine.api.users.UserServiceFactory" %> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <link type="text/css" rel="stylesheet" href="Group.css"> <title>Add Group into DataStore</title> </head> <body> <div id="nav"> <% UserService userService = UserServiceFactory.getUserService(); User user = userService.getCurrentUser(); if (user != null) { response.sendRedirect("/group.jsp"); %> <% } else { %> <a href="<%= userService.createLoginURL(request.getRequestURI()) %>">Sign in</a> <% } %> </div> <h1>Create Group</h1> <table> <tr> <td colspan="2" style="font-weight:bold;"> This demo uses secured resources, so you need to be logged into your Gmail account.</td> </tr> </table> </body> </html> program 5:group.jsp <%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@ page import="java.util.List" %> <%@ page import="javax.persistence.EntityManager" %> <%@ page import="com.google.appengine.api.users.User" %> <%@ page import="com.google.appengine.api.users.UserService" %> <%@ page import="com.google.appengine.api.users.UserServiceFactory" %> <%@ page import="com.crimson.creategroup.Creategroup" %> <%@ page import="com.crimson.creategroup.EMF" %> <html> <body> <% UserService userService = UserServiceFactory.getUserService(); User user = userService.getCurrentUser(); if (user != null) { %> <p>Hello, <%= user.getNickname() %>! (You can <a href="<%= userService.createLogoutURL(request.getRequestURI()) %>">sign out</a>.)</p> <% } else { response.sendRedirect("/index.jsp"); } %> <% final EntityManager em = EMF.get(); try { String query = "select from " + Creategroup.class.getName(); List<Creategroup> groups = (List<Creategroup>) em.createQuery(query).getResultList(); if (groups.isEmpty()) { %> <p>This table not having any group</p> <% } else { for (Creategroup g : groups) { %> <p><b><%= g.getAuthor().getNickname() %></b> wrote:</p> <blockquote><%= g. getGroupname() %></blockquote> <blockquote><%= g. getGroupid() %></blockquote> <blockquote><%= g. getGroupdesc() %></blockquote> <blockquote><%= g. getEmailper() %></blockquote> <% } } } finally { em.close(); } %> <form action="/sign" method="post"> <input type="text" name="Groupname" size="25"> <input type="text" name="Groupid" size="25"> <input type="text" name="Groupdesc" size="250"> <input type="text" name="Emaildesc" size="25"> <div><input type="submit" value="CREATE GROUP" /></div> </form> </body> </html> Program 6:Web.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"> <web-app> <!-- Servlets --> <servlet> <servlet-name>Creategroupservlet</servlet-name> <servlet-class>com.crimson.creategroup.Creategroupservlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>Creategroupservlet</servlet-name> <url-pattern>sign in</url-pattern> </servlet-mapping> <!-- Default page to serve --> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app> Program 7:persistence.xml <?xml version="1.0" encoding="UTF-8" ?> <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0"> <persistence-unit name="transactions-optional"> <provider>org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider</provider> <properties> <property name="datanucleus.NontransactionalRead" value="true"/> <property name="datanucleus.NontransactionalWrite" value="true"/> <property name="datanucleus.ConnectionURL" value="appengine"/> </properties> </persistence-unit> </persistence but is shows the following error Missing required argument 'module[s]' Google Web Toolkit 2.0.0 DevMode [-noserver] [-port port-number | "auto"] [-whitelist whitelist-string] [-blacklist blacklist-string] [-logdir directory] [-logLevel level] [-gen dir] [-codeServerPort port-number | "auto"] [-server servletContainerLauncher] [-startupUrl url] [-war dir] [-extra dir] [-workDir dir] module[s] How to solve this thanks in advance?

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• Facebook Graph API authentication in canvas app and track session

  - by cdpnet

  Short question is: how can i use graph api oauth redirects mechanism to authenticate user and save retrieved access_token and also use javascript SDK when needed (the problem is javascript SDK will have different access_token when initialized). I have initially setup my facebook iframe canvas app, with single sign on. This works well with graph api, as I am able to use access_token saved by facebook's javascript when it detects sessionchange(user logged in). But, I want to rather not do single sign-on. But, use graph api redirect and force user to send to a permissions dialog. But, if he has already given permissions, I shouldn't redirect user. How to handle this? Another question: I have done graph api redirects for authentication and have retrieved access_token also. But then, what if I want to use javascript call FB.ui to do stream.Publish? I think it will use it's own access_token which is set during FB.init and detecting session. So, I am looking for some path here. How to use graph api for authentication and also use facebook's javascript SDK when needed. P.S. I'm using ASP .NET MVC 2. I have an authentication filter developed, which needs to detect the user's authentication state and redirect.(currently it does this to graph api authorize url)

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• codingBat separateThousands using regex (and unit testing how-to)

  - by polygenelubricants

  This question is a combination of regex practice and unit testing practice. Regex part I authored this problem separateThousands for personal practice: Given a number as a string, introduce commas to separate thousands. The number may contain an optional minus sign, and an optional decimal part. There will not be any superfluous leading zeroes. Here's my solution: String separateThousands(String s) { return s.replaceAll( String.format("(?:%s)|(?:%s)", "(?<=\\G\\d{3})(?=\\d)", "(?<=^-?\\d{1,3})(?=(?:\\d{3})+(?!\\d))" ), "," ); } The way it works is that it classifies two types of commas, the first, and the rest. In the above regex, the rest subpattern actually appears before the first. A match will always be zero-length, which will be replaceAll with ",". The rest basically looks behind to see if there was a match followed by 3 digits, and looks ahead to see if there's a digit. It's some sort of a chain reaction mechanism triggered by the previous match. The first basically looks behind for ^ anchor, followed by an optional minus sign, and between 1 to 3 digits. The rest of the string from that point must match triplets of digits, followed by a nondigit (which could either be $ or \.). My question for this part is: Can this regex be simplified? Can it be optimized further? Ordering rest before first is deliberate, since first is only needed once No capturing group Unit testing part As I've mentioned, I'm the author of this problem, so I'm also the one responsible for coming up with testcases for them. Here they are: INPUT, OUTPUT "1000", "1,000" "-12345", "-12,345" "-1234567890.1234567890", "-1,234,567,890.1234567890" "123.456", "123.456" ".666666", ".666666" "0", "0" "123456789", "123,456,789" "1234.5678", "1,234.5678" "-55555.55555", "-55,555.55555" "0.123456789", "0.123456789" "123456.789", "123,456.789" I haven't had much experience with industrial-strength unit testing, so I'm wondering if others can comment whether this is a good coverage, whether I've missed anything important, etc (I can always add more tests if there's a scenario I've missed).

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• Removing padding from structure in kernel module

  - by dexkid

  I am compiling a kernel module, containing a structure of size 34, using the standard command. make -C /lib/modules/$(KVERSION)/build M=$(PWD) modules The sizeof(some_structure) is coming as 36 instead of 34 i.e. the compiler is padding the structure. How do I remove this padding? Running make V=1 shows the gcc compiler options passed as make -I../inc -C /lib/modules/2.6.29.4-167.fc11.i686.PAE/build M=/home/vishal/20100426_eth_vishal/organised_eth/src modules make[1]: Entering directory `/usr/src/kernels/2.6.29.4-167.fc11.i686.PAE' test -e include/linux/autoconf.h -a -e include/config/auto.conf || ( \ echo; \ echo " ERROR: Kernel configuration is invalid."; \ echo " include/linux/autoconf.h or include/config/auto.conf are missing."; \ echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ echo; \ /bin/false) mkdir -p /home/vishal/20100426_eth_vishal/organised_eth/src/.tmp_versions ; rm -f /home/vishal/20100426_eth_vishal/organised_eth/src/.tmp_versions/* make -f scripts/Makefile.build obj=/home/vishal/20100426_eth_vishal/organised_eth/src gcc -Wp,-MD,/home/vishal/20100426_eth_vishal/organised_eth/src/.eth_main.o.d -nostdinc -isystem /usr/lib/gcc/i586-redhat-linux/4.4.0/include -Iinclude -I/usr/src/kernels/2.6.29.4-167.fc11.i686.PAE/arch/x86/include -include include/linux/autoconf.h -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Os -m32 -msoft-float -mregparm=3 -freg-struct-return -mpreferred-stack-boundary=2 -march=i686 -mtune=generic -Wa,-mtune=generic32 -ffreestanding -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -Iarch/x86/include/asm/mach-generic -Iarch/x86/include/asm/mach-default -Wframe-larger-than=1024 -fno-stack-protector -fno-omit-frame-pointer -fno-optimize-sibling-calls -g -pg -Wdeclaration-after-statement -Wno-pointer-sign -fwrapv -fno-dwarf2-cfi-asm -DTX_DESCRIPTOR_IN_SYSTEM_MEMORY -DRX_DESCRIPTOR_IN_SYSTEM_MEMORY -DTX_BUFFER_IN_SYSTEM_MEMORY -DRX_BUFFER_IN_SYSTEM_MEMORY -DALTERNATE_DESCRIPTORS -DEXT_8_BYTE_DESCRIPTOR -O0 -Wall -DT_ETH_1588_051 -DALTERNATE_DESCRIPTORS -DEXT_8_BYTE_DESCRIPTOR -DNETHERNET_INTERRUPTS -DETH_IEEE1588_TESTS -DSNAPTYPSEL_TMSTRENA_TEVENTENA_TESTS -DT_ETH_1588_140_147 -DLOW_DEBUG_PRINTS -DMEDIUM_DEBUG_PRINTS -DHIGH_DEBUG_PRINTS -DMODULE -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(eth_main)" -D"KBUILD_MODNAME=KBUILD_STR(conxt_eth)" -c -o /home/vishal/20100426_eth_vishal/organised_eth/src/eth_main.o /home/vishal/20100426_eth_vishal/organised_eth/src/eth_main.c

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• Multiplication algorithm for abritrary precision (bignum) integers.

  - by nn

  Hi, I'm writing a small bignum library for a homework project. I am to implement Karatsuba multiplication, but before that I would like to write a naive multiplication routine. I'm following a guide written by Paul Zimmerman titled "Modern Computer Arithmetic" which is freely available online. On page 4, there is a description of an algorithm titled BasecaseMultiply which performs gradeschool multiplication. I understand step 2, 3, where B^j is a digit shift of 1, j times. But I don't understand step 1 and 3, where we have A*b_j. How is this multiplication meant to be carried out if the bignum multiplication hasn't been defined yet? Would the operation "*" in this algorithm just be the repeated addition method? Here is the parts I have written thus far. I have unit tested them so they appear to be correct for the most part: The structure I use for my bignum is as follows: #define BIGNUM_DIGITS 2048 typedef uint32_t u_hw; // halfword typedef uint64_t u_w; // word typedef struct { unsigned int sign; // 0 or 1 unsigned int n_digits; u_hw digits[BIGNUM_DIGITS]; } bn; Currently available routines: bn *bn_add(bn *a, bn *b); // returns a+b as a newly allocated bn void bn_lshift(bn *b, int d); // shifts d digits to the left, retains sign int bn_cmp(bn *a, bn *b); // returns 1 if a>b, 0 if a=b, -1 if a<b

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• Expand and Collapse on button click

  - by kumar

  Please this is not a duplicate thread do consider this one..thanks.. <script type="text/javascript"> $(document).ready(function() { $('#tmpOpen').click(function() { var value = $("#tmpOpen").attr("value"); if (value == "Expand") { document.getElementById("tmpOpen").value = "Collapse"; loadAll(); } else { document.getElementById("tmpOpen").value = "Expand"; loadAll(); } }); function loadAll() { $('#Grid tr[role="row"] td a').each(function(row) { if ($('#CGrid tr[role="row"] td.hasClass(sgcollapsed) a')) { $(this).click(); } else if ($('#Grid tr[role="row"] td.hasClass(sgexpanded) a')) { return false; } }); } }); </script> <div> <input type="submit" id="tmpOpen" value="Expand" style="width:145px; height:30px;"/> </div> First time the grid is loading with all the user data..at very firsst row each use can exapdn the grid to see subgird using + sign,, when use clicks + sign I am expanding the row to show subgrid, above code is working at very frist time when I click expand button its expanding all the rows and collpase its colaapsing allt he rows perfectly, but user open any row to see subgrid,, after clicking the expand button opened row will closing and closing rows will be opening.. exactly its doing opposite? can anyone sujjest me what is this cause in the code? thanks

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• [C#] Improving method to read signed 8-bit integers from hexadecimal.

  - by JYelton

  Scenario: I have a string of hexadecimal characters which encode 8-bit signed integers. Each two characters represent a byte which employ the leftmost (MSB) bit as the sign (rather than two's complement). I am converting these to signed ints within a loop and wondered if there's a better way to do it. There are too many conversions and I am sure there's a more efficient method that I am missing. Current Code: string strData = "FFC000407F"; // example input data, encodes: -127, -64, 0, 64, 127 int v; for (int x = 0; x < strData.Length/2; x++) { v = HexToInt(strData.Substring(x * 2, 2)); Console.WriteLine(v); // do stuff with v } private int HexToInt(string _hexData) { string strBinary = Convert.ToString(Convert.ToInt32(_hexData, 16), 2).PadLeft(_hexData.Length * 4, '0'); int i = Convert.ToInt32(strBinary.Substring(1, 7), 2); i = (strBinary.Substring(0, 1) == "0" ? i : -i); return i; } Question: Is there a more streamlined and direct approach to reading two hex characters and converting them to an int when they represent a signed int (-127 to 127) using the leftmost bit as the sign?

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• Improving method to read signed 8-bit integers from hexadecimal.

  - by JYelton

  Scenario: I have a string of hexadecimal characters which encode 8-bit signed integers. Each two characters represent a byte which employ the leftmost (MSB) bit as the sign (rather than two's complement). I am converting these to signed ints within a loop and wondered if there's a better way to do it. There are too many conversions and I am sure there's a more efficient method that I am missing. Current Code: string strData = "FFC000407F"; // example input data, encodes: -127, -64, 0, 64, 127 int v; for (int x = 0; x < strData.Length/2; x++) { v = HexToInt(strData.Substring(x * 2, 2)); Console.WriteLine(v); // do stuff with v } private int HexToInt(string _hexData) { string strBinary = Convert.ToString(Convert.ToInt32(_hexData, 16), 2).PadLeft(_hexData.Length * 4, '0'); int i = Convert.ToInt32(strBinary.Substring(1, 7), 2); i = (strBinary.Substring(0, 1) == "0" ? i : -i); return i; } Question: Is there a more streamlined and direct approach to reading two hex characters and converting them to an int when they represent a signed int (-127 to 127) using the leftmost bit as the sign?

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• how to implement login and service features as in skype or msn chat in a wpf application

  - by black sensei

  Hello Good people! I'm building an WPF application that connect to web services for its operations.Things that i needed to be working are so far fine.Now i'll like to improve use experience by adding features like username editable combobox, sign me in when skype start and start when computer start. I have a fair idea about each feature but very small knowledge about their implementation. Question 1 username combobox : i use a combobox with isEditable set to true but i think it doesnt have the previous username, would that mean that i have to store every successful login username in a sqlite for example? Question 2 sign me in when skype start : i think about using sqlite after all to store the credentials and store the value (as in true or false) if autologin has to be performed. Question 3 start when computer start : i know it's about having is as service.but the process of using it as a service and removing its service when checkbox is checked or unckecked is a bit confusing to me. Question 4 Please wait(signing in) of skype if i want to do things like please wait at login(login is over webservice) in a WPF application should i use a animated gif in a grid that i can show when hiding the login combobox and passwordbox grid or i should use an animated object(for which i have no knowledge about for now) ? This post in mainly for you experts to either point me to the right resource and tell me what is done as best practice. things like dos and dons.Thanks for reading this and please let me have a clair idea about how to start implementing those features. thanks again

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• GAE - Getting TypeError requiring class instance be passed to class's own method...

  - by Spencer Leland

  I'm really new to programming... I set up a class to give supporting information for Google's User API user object. I store this info in the datastore using db.model. When I call the okstatus method of my user_info class using this code: elif user_info.okstatus(user): self.response.out.write("user allowed") I get this error: unbound method okstatus() must be called with user_info instance as first argument (got User instance instead) Here is my user_info class. class user_info: def auth_ctrlr(self, user): if self.status(user) == status_allowed: return ("<a href=\"%s\">Sign Out</a>)" % (users.create_login_url("/"))) else: return ("<a href=\"%s\">Sign In or Get an Account</a>)" % (users.create_logout_url("/"))) def status(self, user): match = sub_user.gql(qu_by_user_id, user.user_id) return match.string_status def group(self, user): match = sub_user.gql(qu_by_user_id, user.user_id) grp = group_names.gql(qu_by_user_id, match.groupID) return grp def okstatus(self, user): match = self.status(user) if match == status_allowed: return True My understanding is that the argument "self" inside the method's calling arguments describes it as a child to the class. I've tried everything I can think of and can't find any related info online. Can someone please tell me what I'm doing wrong? Thanks

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• How do I reference an unsigned assembly from a VSTO Word Doc project?

  - by Gishu

  I created a new project in VS2008. Project type Visual C# > Office > 2007 > Word 2007 Document Added some code.. got Word to do a few jumps through some custom hoops.. all fine. Now I need to reference another assembly (CopyLocal as false) which is not signed. So I add the project reference. Now the project will not build complaining error MSB3188: Assembly 'X.dll' must be strong signed in order to be marked as a prerequisite. The error code page is concise (now accustomed to this) Been googling and reading posts ever since.. No Luck. How do I get around this ? Or is the hidden commandment that all references (for VSTO?) must be strong named / signed. I cannot sign 'X.dll' and be done with it because it is a binary that I don't control also it depends on another bunch of unsigned dlls.. can't set off a chain sign reaction. Update: Solved the build issue by turning CopyLocal=True. But this meant dumping the referenced X.DLL and all its dependencies into the bin\debug folder... Ughh! Tried creating a subfolder called bin\debug\refExecs and referencing X.dll CopyLocal=false from there. The error message was back.

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• Facebook Connect - Using both FBML and PHP Client

  - by Ryan

  I am doing my second Facebook connect site. On my first site, I used the facebook coonect FBML to sign a user in, then I could access other information via the PHP Client. With this site, using the same exact code, it doesn't seem to be working. I'd like someone to be able to sign in using the Facebook button: <fb:login-button length="long" size="medium" onlogin="facebook_onlogin();"></fb:login-button> After they have logged in, the facebook_onlogin() function makes some AJAX requests to a PHP page which attempts to use the Facebook PHP Client. Here's the code from that page: $facebook = new Facebook('xxxxx API KEY xxxxx', 'xxxxx SECRET KEY xxxxx'); //$facebook->require_login(); ** I DONT WANT THIS LINE!! $userID = $facebook->api_client->users_getLoggedInUser(); if($userID) { $user_details = $facebook->api_client->users_getInfo($userID, 'last_name, first_name'); $firstName = $user_details[0]['first_name']; $lastName = $user_details[0]['last_name']; $this->view->userID = $userID; $this->view->firstName = $firstName; $this->view->lastName = $lastName; } The problem is that the PHP Client thinks I don't have a session key, so the $userID never get set. If I override the $userID with my facebook ID (which I am logged in with) I get this error: exception 'FacebookRestClientException' with message 'A session key is required for calling this method' in C:\wamp\www\mab\application\Facebook\facebookapi_php5_restlib.php:3003 If I uncomment the require_login(), it will get a session ID, but it redirects pages around a lot and breaks my AJAX calls. I am using the same code I successfully did this with on another site. Anyone have any ideas why the PHP client don't know about the session ID after a user has logged in with the connect button? Any ideas would be greatly appreciated. Thanks!

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• My Website was hacked using Statcounter! Does Statcounter keep a record of cookies?

  - by Cyril Gupta

  I had a rather interesting case of hacking on my ASP.Net MVC website. For this website I had implemented a rather uncomplicated authentication system for my admin area -- an encrypted cookie which had an identifying signature for the member. Whenever the admin visits the website the cookie would be decrypted and signature verified. If matching he wouldn't have to sign in. Couple of days ago a visitor on my site told me that he was able to sign into my website simply by clicking no a referral link on his Statcounter console which pointed to my admin area (I had visited his site from a link inside my admin view). He just clicked on a link in statcounter and he was signed in as the admin! The only way this could have happened was if statcounter somehow recorded my cookies and used those when he clicked on the link pointing to my admin! Is that logical or fathomable? I don't understand what's going on. Do you have any suggestions as to how I can protect my website against things like this?

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• Approach for replacing forms authentication in .NET application

  - by Ash Machine

  My question is about an approach, and I am looking for tips or links to help me develop a solution. I have an .NET 4.0 web forms application that works with Forms authentication using the aspnetdb SQL database of users and passwords. A new feature for the application is a new authentication mechanism using single sign on to allow access for thousands of new users. Essentially, when the user logs in through the new single-sign-on method, I will be able to identify them as legitimate users with a role. So I will have something like HttpContext.Current.Session["email_of_authenticated_user"] (their identity) and HttpContext.Current.Session["role_of_authenticated_user"] (their role). Importantly, I don't necessarily want to maintain these users and roles redundantly in the aspnetdb database which will be retired, but I do want to use the session objects above to allow the user to pass through the application as if they were in passing through with forms authentication. I don't think CustomRoleProviders or CustomMemberProviders are helpful since they do not allow for creating session-level users. So my question is how to use the session level user and role that I do have to "mimic" all the forms authentication goodness like enforcing: [System.Security.Permissions.PrincipalPermission(System.Security.Permissions.SecurityAction.Demand, Role = "Student")] or <authorization> <allow users="wilma, barney" /> </authorization> Thanks for any pointers.

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• efficiently determining if a polynomial has a root in the interval [0,T]

  - by user168715

  I have polynomials of nontrivial degree (4+) and need to robustly and efficiently determine whether or not they have a root in the interval [0,T]. The precise location or number of roots don't concern me, I just need to know if there is at least one. Right now I'm using interval arithmetic as a quick check to see if I can prove that no roots can exist. If I can't, I'm using Jenkins-Traub to solve for all of the polynomial roots. This is obviously inefficient since it's checking for all real roots and finding their exact positions, information I don't end up needing. Is there a standard algorithm I should be using? If not, are there any other efficient checks I could do before doing a full Jenkins-Traub solve for all roots? For example, one optimization I could do is to check if my polynomial f(t) has the same sign at 0 and T. If not, there is obviously a root in the interval. If so, I can solve for the roots of f'(t) and evaluate f at all roots of f' in the interval [0,T]. f(t) has no root in that interval if and only if all of these evaluations have the same sign as f(0) and f(T). This reduces the degree of the polynomial I have to root-find by one. Not a huge optimization, but perhaps better than nothing.

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• Efficient splitting of elements in a field

  - by Gary

  I have a field in a text file exported from a database. The field contains addresses but sometimes they are quite long and the database allows them to contain multiple lines. When exported, the newline character gets replaced with a dollar sign like this: first part of very long address$second part of very long address$third part of very long address Not every address has multiple lines and no address contains more than three lines. The length of each line is variable. I'm massaging the data for import into MS Access which is used for a mailmerge. I want to split the field on the $ sign if it's there but if the field only contains 1 line, I want to set my two extra output fields to a zero length string so that I don't wind up with blank lines in the address when it gets printed. I have an awk file that's working correctly on all the other data in the textfile but I need to get this last bit working. I tried the below code. Aside from the fact that I get a syntax error at the else, I'm not sure this is a good way to do what I want. This is being done with gawk on Windows. BEGIN { FS = "|" } $1 != "HEADER" { if ($6 ~ /\$/) split($6, arr, "$") address = arr[1] addresstwo = arr[2] addressthree = arr[3] addressLength = length(address) addressTwoLength = length(addresstwo) addressThreeLength = length(addressthree) else { address = $6 addressLength = length($6) addresstwo = "" addressTwoLength = length(addresstwo) addressthree = "" addressThreeLength = length(addressthree) } printf("%*s\t%*s\t\%*s\n", addressLength, address, addressTwoLength, addresstwo, addressThreeLength, addressthree) }

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• If attacker has original data and encrypted data, can they determine the passphrase?

  - by Brad Cupit

  If an attacker has several distinct items (for example: e-mail addresses) and knows the encrypted value of each item, can the attacker more easily determine the secret passphrase used to encrypt those items? Meaning, can they determine the passphrase without resorting to brute force? This question may sound strange, so let me provide a use-case: User signs up to a site with their e-mail address Server sends that e-mail address a confirmation URL (for example: https://my.app.com/confirmEmailAddress/bill%40yahoo.com) Attacker can guess the confirmation URL and therefore can sign up with someone else's e-mail address, and 'confirm' it without ever having to sign in to that person's e-mail account and see the confirmation URL. This is a problem. Instead of sending the e-mail address plain text in the URL, we'll send it encrypted by a secret passphrase. (I know the attacker could still intercept the e-mail sent by the server, since e-mail are plain text, but bear with me here.) If an attacker then signs up with multiple free e-mail accounts and sees multiple URLs, each with the corresponding encrypted e-mail address, could the attacker more easily determine the passphrase used for encryption? Alternative Solution I could instead send a random number or one-way hash of their e-mail address (plus random salt). This eliminates storing the secret passphrase, but it means I need to store that random number/hash in the database. The original approach above does not require storage in the database. I'm leaning towards the the one-way-hash-stored-in-the-db, but I still would like to know the answer: does having multiple unencrypted e-mail addresses and their encrypted counterparts make it easier to determine the passphrase used?

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• ZF2: How to get Zend\Navigation inside custom router?

  - by Katan87

  I have custom router and I have to get access to Zend\Navigation inside this custom router. I was googling, asking and searching and no results :/ All I need is to find nodes with 'link' param using Zend\Navigation in my AliasSegment::match function. Here is my module.config.php: 'navigation' => array( // The DefaultNavigationFactory we configured in (1) uses 'default' as the sitemap key 'default' => array( // And finally, here is where we define our page hierarchy 'account' => array( 'label' => 'Account', 'route' => 'node', 'pages' => array( 'home' => array( 'label' => 'Dashboard', 'route' => 'node', 'params' => array( 'id' => '1', 'link' => '/about/gallery' ), ), 'login' => array( 'label' => 'Sign In', 'route' => 'node', 'params' => array( 'id' => '1', 'link' => '/signin' ), ), 'logout' => array( 'label' => 'Sign Out', 'route' => 'node', ), ), ), ), ), [...] 'service_manager' => array( 'factories' => array( 'translator' => 'Zend\I18n\Translator\TranslatorServiceFactory', 'Navigation' => 'Zend\Navigation\Service\DefaultNavigationFactory', ), ), [...] And here is my AliasSegment class: namespace Application\Controller; use Traversable; use Zend\Mvc\Router\Exception; use Zend\Stdlib\ArrayUtils; use Zend\Stdlib\RequestInterface as Request; use Zend\Mvc\Router\Http; class AliasSegment extends \Zend\Mvc\Router\Http\Segment { public function match(Request $request, $pathOffset = null) { //Here i need to have access to Zend\Navigation return parent::match($request, $pathOffset); } }

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