c# Bitlocker enter password programmatically

Question

I have a disk encrypted with Windows BitLocker. How can I unlock the drive with the password I enter in Winforms. If I can achieve this, I will be able to use the documents on the encrypted drive in Winforms.

I tried the steps at this address, but I could only access the status of BitLocker, nothing else.

you have to execute your application with the admin rights, so you could launch the command to unlock the disk...this command ill be executed with admin rights — Frenchy, Apr 15 '23 at 11:39
@Frenchy - Firstly thanks. Could you give an example of how to do it? — Sarper Sözen, Apr 15 '23 at 12:53
you know your admin password? so you know how to launch your application with admin rights? — Frenchy, Apr 15 '23 at 13:02

Habip Oğuz · Accepted Answer · 2023-04-24T15:19:20.003

using System.Management;

namespace WinForms
{
    public class BitLocker
    {
        private readonly string _computerIp;

        public BitLocker(string computerIp)
        {
            _computerIp = computerIp;
        }

        /// <summary>
        /// Simple Usage for localhost:
        /// var bitlocker = new BitLocker("localhost");
        /// var result = bitlocker.UnlockWithPassphrase("D:", "password");
        /// </summary>
        /// <param name="driveLetter"></param>
        /// <param name="passphrase"></param>
        /// <returns></returns>

        public object UnlockWithPassphrase(string driveLetter, string passphrase)
        {
            object result = null;
            const string wmiNamespace = "\\\\{0}\\root\\CIMV2\\Security\\MicrosoftVolumeEncryption";
            var scope = new ManagementScope(string.Format(wmiNamespace, _computerIp));

            var query = new ObjectQuery("SELECT * FROM Win32_EncryptableVolume");
            var searcher = new ManagementObjectSearcher(scope, query);

            var allVolumes = searcher.Get();
            foreach (var o in allVolumes)
            {
                var volume = (ManagementObject) o;
                if (volume.Properties["DriveLetter"].Value.ToString() != driveLetter) continue;
                object[] methodArgs = { passphrase };
                result = volume.InvokeMethod("UnlockWithPassphrase", methodArgs);
            }
            return result;
        }
    }
}

Note that it requires administrator rights.

c# Bitlocker enter password programmatically

1 Answers1