c# - 为什么.NET RSACryptoServiceProvider 会抛出 "Safe handle has been closed"异常？

Question

以下方法用于使用“SHA1”根据公钥验证数据。第一次调用该方法时可以正常工作。但是，当第二次及后续调用该方法时，会显示以下行

isVerified = RSA.VerifyData(tokenData, CryptoConfig.MapNameToOID(hashType), signature);

导致此异常

{"Safe handle has been closed"} System.Exception {System.ObjectDisposedException}

想想我可能做错了什么？

internal static bool VerifyTokenData(byte[] tokenData, byte[] signature, string hashType)
{
  try
  {
    bool isVerified = false;

    using (RSACryptoServiceProvider RSA = (RSACryptoServiceProvider)CompanyAuthentication.publicKey)
    {
      isVerified = RSA.VerifyData(tokenData, CryptoConfig.MapNameToOID(hashType), signature);
    }

    return isVerified;
  }
  catch (CryptographicException cryptoExc)
  {
    throw new InvalidOperationException("Exception verifying token data", cryptoExc);
  }
  catch (Exception exc)
  {
    throw new InvalidOperationException("Exception verifying token data", exc);
  }
}

使用的公钥被加载到类变量中

internal static void LoadKeys()
{
  try
  {
    X509Certificate2 certificate = new X509Certificate2();
    lock (CompanyAuthentication.thisLock)
    {
      certificate.Import(System.Configuration.ConfigurationManager.AppSettings["companyKeyFilePath"].ToString(), System.Configuration.ConfigurationManager.AppSettings["companyKeyFilePassword"].ToString(), X509KeyStorageFlags.UserKeySet);
      CompanyAuthentication.publicKey = certificate.PublicKey.Key;
      CompanyAuthentication.privateKey = certificate.PrivateKey;
    }
  }
  catch (CryptographicException cryptoExc)
  {
    throw new InvalidOperationException("Exception creating public/private keys", cryptoExc);
  }
  catch (Exception exc)
  {
    throw new InvalidOperationException("Exception creating public/private keys", exc);
  }
}

编辑:这是修改后的代码，可以正常运行。它每次都会加载 key 文件，而不是在类构造函数中加载一次。

    SalesNetAuthentication.LoadKeys();
    using (RSACryptoServiceProvider RSA = (RSACryptoServiceProvider)SalesNetAuthentication.publicKey)
    {
      isVerified = RSA.VerifyData(tokenData, CryptoConfig.MapNameToOID(hashType), signature);
    }

Answer 1

由于您有 using (RSACryptoServiceProvider RSA = ...)，因此当 using 作用域结束时，它会处理该对象。

解决方案是删除using，以便该对象可以在后续尝试中使用，或者在每次需要使用时重新创建该对象。