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CVariableSet::AddExtensionControlBlock starts with the setting up of an exception handler entry and then subtracts ESP by 0x1d0 (464 bytes) to make room for local variables. One can immediately suspect that a significant chunk of data is about to be copied into this stack space few functions use 464 bytes worth of local variables. In the first snippet the point of interest is the loading of EAX, which is loaded with the value of the first parameter (from [ebp+0x8]). A quick investigation with WinDbg reveals that CVariableSet:: AddExtensionControlBlock is called from HttpExtensionProc, which is a documented callback that s used by IIS for communicating with ISAPI DLLs. A quick trip to the Platform SDK reveals that HttpExtension Proc receives a single parameter, which is a pointer to an EXTENSION_ CONTROL_BLOCK structure. In the interest of preserving the earth s forests, I skip several pages of irrelevant code and get to the three lines at 6e9006b7, where offset +64 from EAX is loaded into ESI and then finally into EDI. Offset +64 in EXTENSION_CONTROL_BLOCK is the lpszQueryString member, which is exactly what we re after. The instruction at 6e9007ba stores EDI into [ebp-0x18] (where it remains), and then the code goes to look for character 0x3d within the string using strchr. Character 0x3d is = , so the function is clearly looking for the end of the string I m currently dealing with (the = character is used as a separator in these request strings). If strchr finds the character the function proceeds to calculate the distance between the character found and the beginning of c# code 39 reader C# Imaging - Read Linear Code 39 in C#.NET - RasterEdge.com
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Free to download .NET, C#, VB.NET barcode reader app for Code 39; C# Code 39 recognition SDK; VB.NET Code 39 recognition SDK. MD5 (MD stands for message-digest) is a highly popular cryptographic hashing algorithm that produces a long (128-bit) hash or checksum from a variablelength message. This hash can later be used to uniquely identify the specific message. Two basic properties of MD5 and other cryptographic hashes are that it is extremely unlikely that there would ever be two different messages that produce the same hash and that it is virtually impossible to create a message that will generate a predetermined hash value. With this information, let s proceed to determine the nature of the data that Cryptex is hashing. This can be easily gathered by inspecting the call to CryptHashData. According to the MSDN, the second parameter passed to CryptHashData is the data being hashed. In Listing 6.4, Cryptex is passing EDX, which was earlier loaded from [ESP+C]. The third parameter is the buffer length, which is set to 0x14 (20 bytes). A quick look at the buffer pointer to by [ESP+C] shows the following. c# code 39 reader .NET Barcode Scanner Library API for .NET Barcode Reading and ...
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Read Code39, Code128, PDF417, DataMatrix, QR, and other barcodes from TIF, ... Decode barcodes in C#, VB, Java, C\C++, Delphi, PHP and other languages. Figure 17.8 shows the error plotted against the number of points in the simulations. Squares correspond to the basic case, solid upward triangles to linear importance, and solid downward triangles to cubic importance. The open triangles are the results from using control variates, which are discussed in Section 17.4.4. Figure 17.8 demonstrates that importance sampling dramatically reduces the number of simulations necessary to achieve a given level of accuracy, or, alternatively, reduces the error for a given number of simulations. The gure shows that, even when 10,000 simulations are used, the estimated error in the brute-force case is about 0.003, and this is nearly the same as the error in the cubic case with 10 simulations. There is about a one-thousandfold reduction in the number of points necessary to achieve a particular accuracy when going from the basic case to the cubic case. The ratio between cos2 and the cubic importance function varies between 0.79 and 0.64 and is nearly constant over the region where cos2 has the largest value. Thus, cubic importance sampling generates sampling points that are almost entirely within the area to be integrated. Example 17.3 Importance Sampling for Failure of Vertical Cut Example 17.1 described the use of Monte Carlo simulation to estimate the mean and standard deviation of the margin of safety of the vertical cut. From these we can compute Nothing obvious here this isn t text or anything, just more unrecognized data. The next thing Cryptex does is call CryptGetHashParam on the hash object, with the value 2 in the second parameter. A quick search through WinCrypt.H shows that the value 2 stands for HP_HASHVAL. This means that Cryptex is asking for the actual hash value (that s the MD5 result for those 20 bytes from 0012F5E8). The third parameter passed to CryptGetHashParam tells the function where to write the hash value. Guess what It s being written into 00405038, the global variable that was used earlier for checking whether the password matches. To summarize, Cryptex is apparently hashing unknown, nontextual data using the MD5 hashing algorithm, and is writing the result into a global variable. The contents of this global variable are later compared against a value stored in the Cryptex archive file. If it isn t identical, Cryptex reports an incorrect password. It is obvious that the data that is being hashed in the function from Listing 6.4 is clearly somehow related to the password that was typed. We just don t understand the connection. The unknown data that was hashed in this function was passed as a parameter from the calling function. c# code 39 reader The C# Barcode and QR Library | Iron Barcode - Iron Software
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