barcode printing vb.net FIguRE 3-1 Signing an assembly in C#.NET

Encode PDF417 in C#.NET FIguRE 3-1 Signing an assembly

FIguRE 3-1 Signing an assembly
Creating PDF-417 2d Barcode In Visual C#
Using Barcode maker for .NET framework Control to generate, create PDF417 image in Visual Studio .NET applications.
www.OnBarcode.com
Recognize PDF417 In Visual C#.NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Shared Assemblies and Strongly Named Assemblies
Barcode Creation In Visual C#.NET
Using Barcode generation for VS .NET Control to generate, create barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Bar Code Decoder In C#
Using Barcode decoder for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Hash PE file
PDF417 Generator In VS .NET
Using Barcode generator for ASP.NET Control to generate, create PDF417 image in ASP.NET applications.
www.OnBarcode.com
PDF 417 Printer In .NET
Using Barcode creation for VS .NET Control to generate, create PDF417 image in .NET framework applications.
www.OnBarcode.com
Hash value
Print PDF417 In Visual Basic .NET
Using Barcode drawer for VS .NET Control to generate, create PDF 417 image in .NET applications.
www.OnBarcode.com
Data Matrix Creation In C#
Using Barcode generator for VS .NET Control to generate, create DataMatrix image in VS .NET applications.
www.OnBarcode.com
Signed with private key
UCC-128 Printer In C#
Using Barcode generation for .NET framework Control to generate, create UCC - 12 image in Visual Studio .NET applications.
www.OnBarcode.com
Barcode Generation In C#
Using Barcode encoder for .NET Control to generate, create bar code image in .NET framework applications.
www.OnBarcode.com
RSA digital signature
Matrix 2D Barcode Drawer In Visual C#.NET
Using Barcode drawer for VS .NET Control to generate, create Matrix 2D Barcode image in .NET applications.
www.OnBarcode.com
Creating USS Code 93, USS 93 In C#.NET
Using Barcode creator for Visual Studio .NET Control to generate, create ANSI/AIM Code 93 image in Visual Studio .NET applications.
www.OnBarcode.com
Embedded in PE file
Code-39 Creation In None
Using Barcode drawer for Office Word Control to generate, create ANSI/AIM Code 39 image in Word applications.
www.OnBarcode.com
Encoding UPC - 13 In Objective-C
Using Barcode encoder for iPad Control to generate, create UPC - 13 image in iPad applications.
www.OnBarcode.com
The publisher s public key is also embedded into the AssemblyDef manifest metadata table in this PE file . The combination of the file name, the assembly version, the culture, and the public key gives this assembly a strong name, which is guaranteed to be unique . There is no way that two companies could each produce an assembly named OurLibrary with the same public/private keys unless the companies share this key pair with each other . At this point, the assembly and all of its files are ready to be packaged and distributed . As described in 2, when you compile your source code, the compiler detects the types and members that your code references . You must specify the referenced assemblies to the compiler . For the C# compiler, you use the /reference compiler switch . Part of the compiler s job is to emit an AssemblyRef metadata table inside the resulting managed module . Each entry in the AssemblyRef metadata table indicates the referenced assembly s name (without path and extension), version number, culture, and public key information . Important Because public keys are such large numbers, and a single assembly might reference
EAN / UCC - 13 Maker In VB.NET
Using Barcode creation for VS .NET Control to generate, create EAN-13 Supplement 5 image in .NET applications.
www.OnBarcode.com
UPC - 13 Scanner In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
many assemblies, a large percentage of the resulting file s total size would be occupied with public key information . To conserve storage space, Microsoft hashes the public key and takes the last 8 bytes of the hashed value . These reduced public key values known as public key tokens are what are actually stored in an AssemblyRef table . In general, developers and end users will see public key token values much more frequently than full public key values . Note, however, that the CLR never uses public key tokens when making security or trust decisions because it is possible that several public keys could hash to a single public key token .
Encode Matrix 2D Barcode In .NET
Using Barcode drawer for ASP.NET Control to generate, create Matrix Barcode image in ASP.NET applications.
www.OnBarcode.com
Draw 1D Barcode In VS .NET
Using Barcode maker for ASP.NET Control to generate, create Linear Barcode image in ASP.NET applications.
www.OnBarcode.com
The AssemblyRef metadata information (obtained by using ILDasm .exe) for the JeffTypes .dll file that I discussed in 2 is shown here:
Generating UCC - 12 In None
Using Barcode printer for Software Control to generate, create GS1 - 12 image in Software applications.
www.OnBarcode.com
Bar Code Creator In VS .NET
Using Barcode creation for Reporting Service Control to generate, create bar code image in Reporting Service applications.
www.OnBarcode.com
Part I CLR Basics
AssemblyRef #1 (23000001) ------------------------------------------------------Token: 0x23000001 Public Key or Token: b7 7a 5c 56 19 34 e0 89 Name: mscorlib Version: 4.0.0.0 Major Version: 0x00000004 Minor Version: 0x00000000 Build Number: 0x00000000 Revision Number: 0x00000000 Locale: <null> HashValue Blob: Flags: [none] (00000000)
From this, you can see that JeffTypes .dll references a type that is contained in an assembly matching the following attributes:
"MSCorLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
Unfortunately, ILDasm .exe uses the term Locale when it really should be using Culture . If you look at JeffTypes .dll s AssemblyDef metadata table, you see the following:
Assembly ------------------------------------------------------Token: 0x20000001 Name : JeffTypes Public Key : Hash Algorithm : 0x00008004 Version: 3.0.0.0 Major Version: 0x00000003 Minor Version: 0x00000000 Build Number: 0x00000000 Revision Number: 0x00000000 Locale: <null> Flags : [none] (00000000)
This is equivalent to the following:
"JeffTypes, Version=3.0.0.0, Culture=neutral, PublicKeyToken=null"
In this line, no public key token is specified because in 2, the JeffTypes .dll assembly wasn t signed with a public/private key pair, making it a weakly named assembly . If I had used SN .exe to create a key file compiled with the /keyfile compiler switch, the resulting assembly would have been signed . If I had then used ILDasm .exe to explore the new assembly s metadata, the AssemblyDef entry would have bytes appearing after the Public Key field, and the assembly would be strongly named . By the way, the AssemblyDef entry always stores the full public key, not the public key token . The full public key is necessary to ensure that the file hasn t been tampered with . I ll explain the tamper resistance of strongly named assemblies later in this chapter .
Copyright © OnBarcode.com . All rights reserved.