Pascal (Lazarus/Delphi)

Load an SSH Key from a File (Many Formats Supported)

Demonstrates how to load an SSH public or private key object from a file. The file can be in any of the following formats:

• OpenSSH private key
• OpenSSH public key
• PuTTY private key
• RFC 4716 public key

Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.SshKey;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  sshkey: TSshKey;
  strKey: string;

begin
  success := False;

  sshkey := TSshKey.Create;

  //  First, use the LoadText convenience method to load a text file (of any SSH key format)
  //  into a string:
  strKey := sshkey.LoadText('../mySshKeys/myKey.txt');

  //  Next, load the key into the SSH key object.

  //  If the key is an OpenSSH private key:
  //  (In actuality, the From* methods will automatically detect the format and load
  //  the key correctly.  For example, if a PuTTY private key is passed to FromOpenSshPrivateKey,
  //  it  will still load correctly.)
  success := sshkey.FromOpenSshPrivateKey(strKey);
  if (success <> True) then
    begin
      WriteLn(sshkey.LastErrorText);
    end
  else
    begin
      WriteLn('Loaded OpenSSH private key.');
      Exit;
    end;

  //  If the key is an OpenSSH public key:
  success := sshkey.FromOpenSshPublicKey(strKey);
  if (success <> True) then
    begin
      WriteLn(sshkey.LastErrorText);
    end
  else
    begin
      WriteLn('Loaded OpenSSH public key.');
      Exit;
    end;

  //  If the key is a PuTTY private key:
  success := sshkey.FromPuttyPrivateKey(strKey);
  if (success <> True) then
    begin
      WriteLn(sshkey.LastErrorText);
    end
  else
    begin
      WriteLn('Loaded PuTTY private key.');
      Exit;
    end;

  //  If the key is an RFC 4716 public key:
  success := sshkey.FromRfc4716PublicKey(strKey);
  if (success <> True) then
    begin
      WriteLn(sshkey.LastErrorText);
    end
  else
    begin
      WriteLn('Loaded RFC 4716 public key.');
    end;


  sshkey.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.