Decrypt files encrypted with GnuPG FROM C#

Decrypt files encrypted with GnuPG FROM C#

During these last days I saw the need to encrypt files with GnuPG program at the same time I had to be able to decode the same file

have a C #.

GnuPG To decrypt an encrypted file without using a DLL, use the Process class

I leave the method I have used for this purpose, hope it helps.

In the web.config we need to add the following key:

<add key="passphrase" value="1324356asdf"/>

<add key="WorkingDirectory" value="C:\Program Files\GNU\GnuPG"/>

public static string DecryptFile(string encryptedFilePath)

{

     FileInfo info = new FileInfo(encryptedFilePath);

     string decryptedFileName = info.FullName.Substring(0, info.FullName.LastIndexOf('.')) + "Dec.TXT";

     string encryptedFileName = info.FullName;

     string password = System.Configuration.ConfigurationManager.AppSettings["passphrase"].ToString();         

     System.Diagnostics.ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo("cmd.exe");           

     psi.CreateNoWindow = true;

     psi.UseShellExecute = false;

     psi.RedirectStandardInput = true;

     psi.RedirectStandardOutput = true;

     psi.RedirectStandardError = true;

     psi.WorkingDirectory = @System.Configuration.ConfigurationManager.AppSettings["WorkingDirectory"].ToString();

     System.Diagnostics.Process process = System.Diagnostics.Process.Start(psi);

     string sCommandLine = @"echo " + password + "|gpg.exe --passphrase-fd 0 --batch --verbose --yes --output " + decryptedFileName + @" --decrypt """ + encryptedFileName;

     process.StandardInput.WriteLine(sCommandLine);

     process.StandardInput.Flush();

     process.StandardInput.Close();

     process.WaitForExit();

     //string result = process.StandardOutput.ReadToEnd();

     //string error = process.StandardError.ReadToEnd();

     process.Close();

     return decryptedFileName;

}   

See also



Signing Soap Message With X509 Certificate

Generate A New Key Pair - GnuPG

GnuPG