System.Security.Cryptography.CryptographicException - object already exists

Question

public RSAKeyPair() { string keyContainerName="pEncKey" CspParameters cspp = new CspParameters(); cspp.Flags = CspProviderFlags.UseMachineKeyStore; cspp.KeyContainerName = keyContainerName; try { m_RSA = new RSACryptoServiceProvider(1024, cspp); } catch(Exception e){} } 

what is the reason for throwing the following exception:

  System.Security.Cryptography.CryptographicException - object already exist 

stack trace is as follows:

  at System.Security.Cryptography.CryptographicException.ThrowCryptographicException(Int32 hr) at System.Security.Cryptography.Utils._CreateCSP(CspParameters param, Boolean randomKeyContainer, SafeProvHandle& hProv) at System.Security.Cryptography.Utils.CreateProvHandle(CspParameters parameters, Boolean randomKeyContainer) at System.Security.Cryptography.Utils.GetKeyPairHelper(CspAlgorithmType keyType, CspParameters parameters, Boolean randomKeyContainer, Int32 dwKeySize, SafeProvHandle& safeProvHandle, SafeKeyHandle& safeKeyHandle) at System.Security.Cryptography.RSACryptoServiceProvider.GetKeyPair() at System.Security.Cryptography.RSACryptoServiceProvider..ctor(Int32 dwKeySize, CspParameters parameters, Boolean useDefaultKeySize) at System.Security.Cryptography.RSACryptoServiceProvider..ctor(Int32 dwKeySize, CspParameters parameters) at XXXXXXXX.Core.RSAKeyPair..ctor(String keyContainerName) 

Answer 1

This is because the program works with different users. One with a regular user and the other with an autoloader.

When a key is created, its permission is granted only to the creator.

Therefore, you need to change the key resolution so that it can be used by everyone.

 CspParameters cspParams; cspParams = new CspParameters(PROVIDER_RSA_FULL); cspParams.KeyContainerName = CONTAINER_NAME; cspParams.Flags = CspProviderFlags.UseMachineKeyStore; cspParams.ProviderName = "Microsoft Strong Cryptographic Provider"; CryptoKeyAccessRule rule = new CryptoKeyAccessRule("everyone", CryptoKeyRights.FullControl, AccessControlType.Allow); cspParams.CryptoKeySecurity = new CryptoKeySecurity(); cspParams.CryptoKeySecurity.SetAccessRule(rule); 

for more details,

http://whowish-programming.blogspot.com/2010/10/systemsecuritycryptographycryptographic.html