title: Getting Exception "Key not valid for use in specified state" while decrypting a file
body: <p>I am generating a certificate and encrypting that certifiacte as a bin file to the local disk.
  I am doing this using the following powershell code:</p>
  
  <pre><code>$bytes = $CertificateResponse.ToCharArray() | % {[byte] $_}
  [Byte[]]$entropy = 4,17,9,88,236,1688,1486,41,182,16,72,93,2,188,2,23
  
  # Encrypt the byte array.
  $encryptedBytes = [System.Security.Cryptography.ProtectedData]::Protect(
          $bytes, 
          $entropy, 
          [System.Security.Cryptography.DataProtectionScope]::LocalMachine)
  
  $encryptedBytes | Set-Content C:\certificate\xxx.bin -Encoding Byte
  
  </code></pre>
  
  <p>Later the same binary file is kept on other machine, and i am trying to read and decrypt the file as follows(using c#):</p>
  
  <pre><code> try
              {
                  this.EntropyKey = new byte[] { 4,17,9,88,236,1688,1486,41,182,16,72,93,2,188,2,23};
                  var data = File.ReadAllBytes(Path.Combine(localPath, "xxx.bin"));
                  var decryptedData = ProtectedData.Unprotect(data, this.EntropyKey, DataProtectionScope.LocalMachine);
                  this.Certificate = new X509Certificate(decryptedData);
                  return Task.CompletedTask;
              }
              catch (Exception ex)
              {
                  throw new NotImplementedException();
              }
  
  </code></pre>
  
  <p>When I run the code I am getting Exception as "Key not valid for use in specified state" at the line where i am trying to decrypt.
  It works fine if I try to decrypt using powershell command. Any help would be much appreciated.
  Note : I have given read permission to the file.</p>