如何检查 .NET 中是否存在 RSA 密钥容器

Question

如果具有 ContainerName 的密钥不存在，如何

    Dim cp As New CspParameters()
    cp.KeyContainerName = ContainerName
    cp.Flags = CspProviderFlags.UseMachineKeyStore

确保不会创建新密钥？

Answer 1

试试这个：

    public static bool DoesKeyExists(string containerName)
    {
        var cspParams = new CspParameters
        {
            Flags = CspProviderFlags.UseExistingKey,
            KeyContainerName = containerName
        };

        try
        {
            var provider = new RSACryptoServiceProvider(cspParams);
        }
        catch (Exception e)
        {
            return false;
        }
        return true;
    }

Answer 2

这是我们用来测试给定容器名称的 powershell 脚本：

# Test if an rsa key container exists on this system.
function Test-RsaKeyContainerName(
    [Parameter(Mandatory=$true)][string] $ContainerName,
    [Parameter(Mandatory=$false)][switch] $UserContainer = $false
) {
    $csp = New-Object -TypeName "System.Security.Cryptography.CspParameters";
    $csp.KeyContainerName = $ContainerName;
    if (!($UserContainer)) {
        $csp.Flags = [System.Security.Cryptography.CspProviderFlags]::UseMachineKeyStore;
    }
    $csp.Flags = $csp.Flags -bor [System.Security.Cryptography.CspProviderFlags]::UseExistingKey;
    try {
        $rsa = New-Object -TypeName "System.Security.Cryptography.RSACryptoServiceProvider" -ArgumentList ($csp);
    } catch [System.Management.Automation.MethodInvocationException] {
        if ($error[0].Exception.InnerException -ne $null -and
            $error[0].Exception.InnerException.GetType() -eq [System.Security.Cryptography.CryptographicException] -and
            $error[0].Exception.InnerException.Message.StartsWith("Keyset does not exist")) {           
            return $false;
        } else {
            throw;
        }       
    }
    return $true;
}

如果您确实需要枚举系统上安装的密钥，您可以从 KeyPal 借用代码，网址为 http://www.jensign.com/dotnet/keypal/source/KeyPal.txt

Answer 3

您可以在加密货币提供商上使用

.PersistKeyInCsp = false

，这将确保密钥不会留在容器中。你是这个意思吗？