qr code generator vb.net 2010 FIguRE 3-1 Signing an assembly in VS .NET

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FIguRE 3-1 Signing an assembly
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Shared Assemblies and Strongly Named Assemblies
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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
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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 .
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The AssemblyRef metadata information (obtained by using ILDasm .exe) for the JeffTypes .dll file that I discussed in 2 is shown here:
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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 .
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