通過C#來加載X509格式證書文件並生成RSA對象

private static RSACryptoServiceProvider GetPrivateKey(string priKeyFile, string keyPwd)
{
    var pc = new X509Certificate2(priKeyFile, keyPwd, X509KeyStorageFlags.MachineKeySet);
    return (RSACryptoServiceProvider) pc.PrivateKey;
}

private static RSACryptoServiceProvider GetPublicKey(string pubKeyFile)
{
    var pc = new X509Certificate2(pubKeyFile);
    return (RSACryptoServiceProvider) pc.PublicKey.Key;
}

*.cer格式公鑰證書及*.pfx格式私鑰證書