How to set key size of RSA key created using aspnet_regiis?
I have created a customer RSA key container (for encrypting connection string in web.config) using the following command:
aspnet_regiis -pc "Test开发者_JS百科Keys" -size 2048 -exp
I then exported the key to an xml file and used it to initialise an instance of RSACryptoServiceProvider so that I could check the key size was definitely 2048. However, using the code below, the key size is displayed as 1024.
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
using (FileStream fs = new FileStream(@"C:\TestKeys.xml", FileMode.Open))
{
using (StreamReader sr = new StreamReader(fs))
{
rsa.FromXmlString(sr.ReadToEnd());
}
}
Console.WriteLine(rsa.KeySize.ToString());
}
It seems that aspnet_regiis is ignoring the -size argument. Am I missing something?
Also, is there a recommended key size for encrypting .Net config sections using RSA?
I ended up using the RSACryptoServiceProvider class to create the key container as it creates the keys with the size specified.
CspParameters cp = new CspParameters();
cp.KeyContainerName = keyContainerName;
cp.Flags = CspProviderFlags.UseMachineKeyStore;
cp.KeyNumber = 1;
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(keySize, cp))
{
using (FileStream fs = new FileStream(fileName, FileMode.Create))
{
using (StreamWriter sw = new StreamWriter(fs))
{
sw.WriteLine(rsa.ToXmlString(true));
}
}
}
NIST receommend a key size of 3072 bits for security required beyond 2030.
Recommendations for key management - see Table 4.
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