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[CRYPTO]Use RSA keyset generated by .NET sn.exe tool

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[CRYPTO]Use RSA keyset generated by .NET sn.exe tool

I’ve found some public articles about how to manually extract RSA keyset from the snk file generated by .NET sdk tool “sn.exe”.

#Strong Name Tool (Sn.exe)

https://msdn.microsoft.com/en-us/library/k5b5tt23(VS.80).aspx

And some community guys have also encountered some problems manually use the sn.exe generated snk file to get RSA keyinfo and perform encryption/signing. By doing some research on this, I found that it is really not good idea to use SN.EXE generated key file for our RSA crypto task. Here are some reasons:

l Sn.exe generated key file is of an undocumented format. Microsoft doesn’t expect the developers to directly load RSA keyset from this file.

l Sn.exe generated keyset is “signature” keyset, therefore, it is used for data signing and verifying

l The reasonable usage of SN.exe generated keyset is for digital signing against .NET assembly(strong-name signing).

However, if you do want to use the RSA keyset generated by sn.exe(-k), you can consider the following means:

1.generate snk file via "sn.exe -k" command:

sn.exe -k MyTestRSA_SNKContainer

2.install the keyset into a KeyContainer via "sn.exe -i" command:

sn.exe -i MyTestRSA.snk MyTestRSA_SNKContainer

3.Read keyset from KeyContainer(instead of snk file):

static void Use_SNKContainer()

        {

            RSACryptoServiceProvider RSA = null;

            string container = "MyTestRSA_SNKContainer";

            CspParameters cp1 = new CspParameters();

            cp1.Flags = CspProviderFlags.UseMachineKeyStore | CspProviderFlags.UseExistingKey;

            cp1.KeyNumber = (int)KeyNumber.Signature;

            cp1.KeyContainerName = container;

       RSA = new RSACryptoServiceProvider(cp1);

            //perform signing or verification

           

Also, if you want to generate RSA keyset programmatically in .NET code, here are some samples:

#How to generate key pairs, encrypt and decrypt data with .NET (C#)

https://blogs.msdn.com/alejacma/archive/2008/10/23/how-to-generate-key-pairs-encrypt-and-decrypt-data-with-net-c.aspx

#Generating Keys for Encryption and Decryption

https://msdn.microsoft.com/en-us/library/5e9ft273(VS.80).aspx

Comments

  • Anonymous
    January 21, 2009
    PingBack from http://windows7news.com.au/2009/01/22/cryptouse-rsa-keyset-generated-by-net-snexe-tool/

  • Anonymous
    May 24, 2009
    hello I've got a "Key not valid for use in specified state." error on ToXmlString. But this only happens when "bPrivate" = true - i.e. export private key as well. cspParams = new CspParameters(); cspParams.Flags = CspProviderFlags.UseMachineKeyStore | CspProviderFlags.UseExistingKey; cspParams.KeyNumber = (int)KeyNumber.Signature; cspParams.KeyContainerName = strContainerName; rsaProvider = new RSACryptoServiceProvider(cspParams); // Export key strKey = rsaProvider.ToXmlString(bPrivate); Any idea? Thanks!

  • Anonymous
    May 24, 2009
    Do I need to make my certificate "Exportable" somehow? http://bytes.com/groups/net/663246-system-security-cryptography-rsa-toxmlstring-key-not-valid-use-specified-state I added "Certificates" add-in to my MMC, I can't find the container that I supposedly imported using:   sn.exe -i MyTestRSA.snk MyTestRSA_SNKContainer And even if I found it how can I make it "Exportable"? I'm already an Administrator when I got "Key not valid for use in specified state."