dotnet core linux 接入支付宝H5支付，提示：System.PlatformNotSupportedException","Message":"'CspParameters' requires Windows Cryptographic API (CAPI), which is not available on this platform.

用的官方提供的demo，实际上部署后却出现了上图的错误。和技术支持沟通无效后，走上了不归路。

在微软的github dotnet/core开源库提交了issue后，终于获得了解决。附上链接：https://github.com/dotnet/core/issues/3020

有道翻译一下：

CspParameters is about directly interacting with the Windows crypto libraries, which are only available on Windows.

If you're strongly typed as RSACryptoServiceProvider (which is generally a bad idea, it's the most limited of the RSA types) you can just eliminate the use of the CspParameters parameter... ImportParameters (when the key isn't named) makes a new ephemeral key and imports into that. And the original key size data is ignored when using ImportParameters.

CspParameters是关于直接与只在Windows上可用的Windows加密库交互的。 如果您是强类型为RSACryptoServiceProvider(这通常是一个坏主意，它是RSA类型中最受限制的)，您可以直接取消使用CspParameters参数…ImportParameters(当键没有被命名时)创建一个新的临时键并导入其中。当使用ImportParameters时，原始密钥大小数据将被忽略。

附上官方demo代码，被注视掉的部分就是引起问题的原因：　　　　

 // ------- create RSACryptoServiceProvider instance and initialize with public key -----
                //CspParameters CspParameters = new CspParameters();
                //CspParameters.Flags = CspProviderFlags.UseMachineKeyStore;

                //int bitLen = 1024;
                //if ("RSA2".Equals(signType))
                //{
                //    bitLen = 2048;
                //}

                RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
                RSAParameters RSAparams = new RSAParameters();
                RSAparams.Modulus = MODULUS;
                RSAparams.Exponent = E;
                RSAparams.D = D;
                RSAparams.P = P;
                RSAparams.Q = Q;
                RSAparams.DP = DP;
                RSAparams.DQ = DQ;
                RSAparams.InverseQ = IQ;
                RSA.ImportParameters(RSAparams);