To sign an assembly with a strong name, you must have a public/private key pair. This public and private cryptographic key pair is used during compilation to create a strong-named assembly. You can create a key pair using the Strong Name tool (Sn.exe). Key pair files usually have an .snk extension.
Note
In Visual Studio, the C# and Visual Basic project property pages include a Signing tab that enables you to select existing key files or to generate new key files without using Sn.exe. In Visual C++, you can specify the location of an existing key file in the Advanced property page in the Linker section of the Configuration Properties section of the Property Pages window. The use of the AssemblyKeyFileAttribute attribute to identify key file pairs was made obsolete beginning with Visual Studio 2005.
From this key pair you can extract the Public Key and then calculate the Public Key Token. For this step you need sn.exe again – sn.exe filename.snk filenamepublickey.snk. This generates another snk file that only holds the Public Key. This second file can now be used to calculate the Public Key Token, again by using sn.exe – sn.exe –tp. Jul 02, 2009 Key pair written to bar.snk. As you can see, this creates a.SNK file, which contains a public and a private key. However, its contents are not human readable. Further, the InternalsVisibleTo attribute requires that you provide the public key in the constructor. (Don’t even think about trying it without it.). Crt and key files represent both parts of a certificate, key being the private key to the certificate and crt being the signed certificate. It's only one of the ways to generate certs, another way would be having both inside a pem file or another in a p12 container. Save the text file in the same folder where you saved the private key, using the.pub extension to indicate that the file contains a public key. If you or others are going to use an SSH client that requires the OpenSSH format for private keys (such as the ssh utility on Linux), export the private key: On the Conversions menu, choose Export. Displays the token for the public key stored in infile. The contents of infile must be a public key previously generated from a key pair file using -p. Do not use the -tp option to extract the token directly from a key pair file. Sn.exe computes the token by using a hash function from the public key.
Create a key pair
To create a key pair, at a command prompt, type the following command:
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sn –k <file name>
In this command, file name is the name of the output file containing the key pair.
Generate Snk File From Public Key Online
The following example creates a key pair called sgKey.snk.
If you intend to delay sign an assembly and you control the whole key pair (which is unlikely outside test scenarios), you can use the following commands to generate a key pair and then extract the public key from it into a separate file. First, create the key pair:
Next, extract the public key from the key pair and copy it to a separate file:
Once you create the key pair, you must put the file where the strong name signing tools can find it.
When signing an assembly with a strong name, the Assembly Linker (Al.exe) looks for the key file relative to the current directory and to the output directory. When using command-line compilers, you can simply copy the key to the current directory containing your code modules.
If you are using an earlier version of Visual Studio that does not have a Signing tab in the project properties, the recommended key file location is the project directory with the file attribute specified as follows: