Execute multiple command prompt commands from c#

Question

I'm trying to generate a private key with OpenSSL from c#. In order to do this, I've tried to redirect process standard input, but I still have some problems. I mention that I want to use aes256 encryption over the private key, and for achieving that, it needs a password, so, my problem is that I don't know how to transmit that password to the process, I mean that I create the process, I run the command for creating the key with OpenSSL with aes256 encryption and further I have to enter the password and confirmation password.

This is my code:

Process cmd1 = new Process();
cmd1.StartInfo.FileName = "cmd.exe";
cmd1.StartInfo.RedirectStandardInput = true;
cmd1.StartInfo.RedirectStandardOutput = true;
cmd1.StartInfo.CreateNoWindow = true;
cmd1.StartInfo.UseShellExecute = false;
cmd1.StartInfo.WorkingDirectory = @"C:\usr\local\ssl\bin";

cmd1.Start();

cmd1.StandardInput.WriteLine("openssl genrsa -aes256 -out E:\\testing_folder\\urian_test7.com.key.pem 2048");
cmd1.StandardInput.Flush();
cmd1.StandardInput.WriteLine("123456");
cmd1.StandardInput.Flush();
cmd1.StandardInput.WriteLine("123456");
cmd1.StandardInput.Flush();
cmd1.StandardInput.Close();

Console.WriteLine("We're done! You got the key!");
cmd1.Close();

So, I don't know how to send the password required by the private key generetion...I mean that if I run that command in cmd/openssl(eg: openssl genrsa -aes256), it generates the RSA private key, and after that it asks me to introduce a pass phrase and a verification of pass phrase. So, if I want to do this from c#, how can I do it? Because I don't know how can I transmit that pass phrase. That's what I mean.

These seem relevant: Run Command Prompt Commands and How To: Execute command line in C#. — jww
– jww, Commented Oct 29, 2016 at 9:27
This will work. It execute multiple command lines with the same process. — Keyur Ramoliya
– Keyur Ramoliya, Commented Oct 29, 2016 at 9:35
using (StreamWriter sw = cmd1.StandardInput) { if(sw.BaseStream.CanWrite) { sw.WriteLine("openssl genrsa -aes256 -out E:\\testing_folder\\urian_test_final4.com.key.pem 2048"); sw.WriteLine("123456"); sw.WriteLine("123456"); } } — Paul
– Paul, Commented Oct 29, 2016 at 9:52
But it doesn't work, it simply creates the file, but an empty file. — Paul
– Paul, Commented Oct 29, 2016 at 9:53
@Paul - Please add additional information, like non-trivial code, to your question. Do so by by clicking Edit in the lower left hand corner near the tags like C# and Command Prompt. — jww
– jww, Commented Oct 29, 2016 at 11:30

Marius Orha · Accepted Answer · 2020-06-10 20:39:09Z

3

You can try:

    Process cmd = new Process();

    cmd.StartInfo.FileName = "cmd.exe";
    cmd.StartInfo.RedirectStandardInput = true;
    cmd.StartInfo.UseShellExecute = false;

    cmd.Start();

    using (StreamWriter sw = cmd.StandardInput)
    {
        if (sw.BaseStream.CanWrite)
        {
            sw.WriteLine("openssl genrsa -aes256 -out E:\\testing_folder\\test_file_com.key.pem 2048");
            sw.WriteLine("123456");
            sw.WriteLine("123456");
        }
    }

edited Jun 10, 2020 at 20:39

answered Apr 21, 2017 at 6:50

Marius Orha

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