c# - Getting exception when calling CryptGetKeyParam -


I am trying to use crypto API (CAPI) to exchange a Diffie Hellman key I am using MSDN documentation. 

  // Step 0) receives the reference, then (! CAPI.CryptAcquireContext (reference this._cryptographicProvider, null, null, CAPI.PROV_DSS_DH, CAPI.CRYPT_VERIFYCONTEXT)) HandleWin32Error ( "cryptographic context Unable to get "); // Setp 1) Generate Private Key (! CAPI.CryptGenKey (this._cryptographicProvider, CAPI.CALG_DH_EPHEM, DHKEYSIZE & lt; 16) CAPI.CRYPT_EXPORTABLE | CAPI.CRYPT_PREGEN, this referee. _privateKeyPointer) HandleWin32Error ("Generate Unable to do private cryptographic key "); UIT GSize = 0; CAPI.CryptGetKeyParam (this._privateKeyPointer, CAPI.KP_G, blank, referee GSize, (UIT) 0); Byte [] g = new byte [jeezy]; Var res = CAPI.CryptGetKeyParam (this._privateKeyPointer, CAPI.KP_G, g, referee GSize, (UIT) 0);

The first call cryptgetKeyParam works perfectly, i.e. it successfully returns the size of G as 64.

Then the code on the last line fails, neither can return anything with the G-buffer (that is the case in the example) race = true, or an AccessViolationException when I use the following call with: 

  var res = CAPI.CryptGetKeyParam (this._privateKeyPointer, CAPI.KP_G, Ref G, ref Jisijh (UIT), 0);

Yes, I overloaded P \ invoke methods: 

  [DllImport ( "advapi32.dll", charset = CharSet.Auto, SetLastError = true )] public static exile bool CryptGetKeyParam (IntPtr HKEY, uint dwParam, ref byte [] pbData, ref uint pdwDataLen, uint dwFlags); [DllImport ( "advapi32.dll", charset = CharSet.Auto, SetLastError = true)] public static exile bool CryptGetKeyParam (IntPtr HKEY, uint dwParam, byte [] pbData, ref uint pdwDataLen, uint dwFlags);

Any ideas / ideas on this?

* Interestingly, I have been able to get a full Diffie Hellman key exchange to work, i.e. successfully successfully connecting between the same secret (S1) two parties, but this pre-defined P & G parameter Together with I am working on the code again because some did not look right because the secret secret was the same for every key exchange, which meant that X was continuously. (I.e. Bob and Alice agreed on S1 each time!?) - Here I was, again, with an issue CryptGetKeyParam as I was unable to determine the size of the session key when using KP_KEYLEN?!

Ahh Ha

This reference was a combination of the flag and overloaded method. Now works!

When P & amp; G is not predefined, then do not set CRYPT_PREGEN flags ... and only one of the two overloaded methods (this one): 

  [DllImport ("advapi32.dll", Charset = CharSetkAuto, SetLastError = True)] public static bool extension CryptGetKeyParam (IntPtr hKey, uint dwParam, byte [] pbData, ref uint pdwDataLen, uint dwFlags);

-

Comments

Post a Comment

Popular posts from this blog

Eclipse CDT variable colors in editor -

I hope this is a good question to ask here. This programming is related, so I thought it would be better than the superuser, so I am using the CDT C ++ Eclipse plugin. I know how the editor changes colors for some things But is there a way to do that all the variables are different colors? For example in KDEValue, it sets the local variables and square variables in different colors and bold square squares. Can I copy it to CDT? Eclips provides some level of color customization for text editor syntax You can see it on the following: There are many elements, including the Window> Preferences> C / C ++> Editor> Syntax color code that can be changed, assembly, Comments, Preprocessor and Doxian Under the code, it is possible to change the color of some variable types, such as global variables, local variable announcements, local variable references, and parameter variables. But I do not think the code is capable of changing the color of each variable declared....
Read more

AJAX doesn't send POST query -

$ (दस्तावेज़) .ready (function () {function ajaxselectrss (rssurlvar) {var ajaxRequest; // वेरिएबल जो अजाक्स को संभव बनाता है! कोशिश करें कि {// ओपेरा 8.0+, फ़ायरफ़ॉक्स, सफारी अजाक्स अनुरोध} = नया एक्सएमएलएचटीपीआरइवेस्ट ();} कैच (ई) {// इंटरनेट एक्सप्लोरर ब्राउज़र्स {ajaxRequest = new ActiveXObject ("Msxml2.XMLHTTP");} पकड़ो (ई) {try {ajaxRequest = new ActiveXObject ("Microsoft.XMLHTTP");} कैच (ई) {// कुछ गलत चेतावनी ("आपका ब्राउज़र तोड़ दिया!"); वापसी झूठी;}}} // एक बनाएं फ़ंक्शन जो सर्वर से भेजे गए डेटा प्राप्त करेंगे ajaxRequest.onreadystatechange = function () {if (ajaxRequest.readyState == 4) {var ajaxDisplay = document.getElementById ('news'); ajaxDisplay.innerHTML = ajaxRequest.responseText;}} / / Var rssurlvar = $ (this) .attr ("title"); var queryString = "rurl =" + rssurlvar; var urltofile = "rssget.php"; ajaxRequest.open ("पोस्ट", urltofile, सच); ajaxRequ Est.setRequestHeader ("सामग्री-प्र...
Read more

wpf - Custom Message Box Advice -

Well, I'm using a custom window box that comes with some custom control boxes that accompany the text The producers who are displayed are called. I have a defined event, which has been subscribed through the original class, it gets burnt when clicking on the button. However, I can not see how to use it effectively, I would like to return one yes, whether yes or not, but obviously my code will continue to execute, so this Below is some example code to clarify the problem that the method has subscibed by clicking on the button. Message box window Public partial class custom message box: window {public representative message messagebox object sender, event events e); Public event messagebox handler messagebox document; Public Customs Box () {Initial group (); } Public Customsbox (String Message) {InitializeComponent (); This.txtdescription.Text = Message; } Public Customsbox (String Message, String Title, String First BTNtext) {Initialization (); This.lbltitle.Content =...
Read more