来自C#的SmartCard的证书

Question

如何确保我从智能卡访问证书而不是在c#中形成我的个人证书存储区？如何让我的RSACryptoProvider使用我的智能卡证书私钥？

谢谢

沃利

Answer 1

有时，特别是如果您没有在智能卡上使用默认密钥容器名称（Microsoft 推荐），证书不会复制到本地证书存储。解决方案是使用 crypto api 通过 KP_CERTIFICATE 访问密钥，从检索到的数据构造证书，并为其分配一个使用您自己的密钥容器名称构造的新 RSACryptoServiceProvider。

伪 C# 代码如下：

int reti = CryptoApi.CryptGetUserKey(_hprovider, keytype, ref userKey);

if (reti)
{
    reti =CryptoApi.CryptGetKeyParam(_userKey, KP_CERTIFICATE, ref  pbdata, ref pwddatalen, 0);
}

if (reti || pwddatalen>0)
{
    byte[] data = new byte[pwddatalen];
    ret  = CryptoApi.CryptGetKeyParam(_userKey, KP_CERTIFICATE, data, ref pwddatalen, 0);
    if (ret) 
    {
        X509Certificate2 c = new X509Certificate2(data);
        X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
        store.Open(OpenFlags.ReadOnly);
        X509Certificate2Collection col = store.Certificates.Find(X509FindType.FindByThumbprint, c.Thumbprint, validonly);
        store.Close();

        if (col.Count != 1) 
        {
            //not found in store - CSP didn't copy it
            c.PrivateKey = PrivateKey(keytype);
            return c;
        }
        else
        {
            return col[0];
        }
    }
}


private RSACryptoServiceProvider PrivateKey (KeyType keytype)
{
    CspParameters csparms = new CspParameters();
    csparms.KeyContainerName = _containerName;
    csparms.ProviderName = _provider;
    csparms.ProviderType = 1;
    csparms.Flags = CspProviderFlags.UseMachineKeyStore | CspProviderFlags.UseExistingKey;
    csparms.KeyNumber = (int)keytype;

    return new RSACryptoServiceProvider(csparms);
}