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(Delphi DLL) Working with PEM Encrypted Private Keys

Demonstrates how to load and save PEM encrypted private keys.

Chilkat for Delphi Downloads

Chilkat non-ActiveX DLL for Delphi

Chilkat ActiveX DLL for Delphi

* The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Global, FileAccess, PrivateKey, Pem;

...

procedure TForm1.Button1Click(Sender: TObject);
var
chilkatGlob: HCkGlobal;
success: Boolean;
pem: HCkPem;
pemPassword: PWideChar;
fac: HCkFileAccess;
pemText: PWideChar;
i: Integer;
numPrivateKeys: Integer;
privKey: HCkPrivateKey;

begin
//  Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
//  by calling UnlockBundle.  It requires a Bundle unlock code.
chilkatGlob := CkGlobal_Create();
success := CkGlobal_UnlockBundle(chilkatGlob,'Anything for 30-day trial.');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkGlobal__lastErrorText(chilkatGlob));
    Exit;
  end;

pem := CkPem_Create();

pemPassword := 'secret';

//  To load a PEM file containing encrypted private keys, simply
//  provide the password.
success := CkPem_LoadPemFile(pem,'/Users/chilkat/testData/pem/pemContainingEncryptedPrivateKeys.pem',pemPassword);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkPem__lastErrorText(pem));
    Exit;
  end;

fac := CkFileAccess_Create();
pemText := CkFileAccess__readEntireTextFile(fac,'/Users/chilkat/testData/pem/pemContainingEncryptedPrivateKeys.pem',pemPassword);

//  To load a PEM from a string, call LoadPem instead of LoadPemFile:
success := CkPem_LoadPem(pem,pemText);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkPem__lastErrorText(pem));
    Exit;
  end;

//  A few notes:
//  The PEM may contain both private keys and certificates (or anything else).
//  The password is utilized for whatever content in the PEM is encrypted.
//  It is OK to have both encrypted and non-encrypted content within a given PEM.

//  PEM private keys can be encrypted in different formats.  The LoadPem and LoadPemFile
//  methods automatically handle the different formats.
//  One format is PKCS8 and is indicated by this delimiter within the PEM:

//  -----BEGIN ENCRYPTED PRIVATE KEY-----
//  MIICoTAbBgkqhkiG9w0BBQMwDgQIfdD0zv24lgkCAggABIICgE0PdHJmRbNs6cBX
//  ...

//  Another format, we'll call "passphrase" looks like this in the PEM:
//  -----BEGIN RSA PRIVATE KEY-----
//  Proc-Type: 4,ENCRYPTED
//  DEK-Info: DES-EDE3-CBC,A4215544D11C5D0C
// 
//  paqy9XRexcSjurHfG0xhCaUD0HrvIdhuC0CbRxxxeMlkLaV6+uT80rBxt2AaibWG
//  ...

//  Show the bit length of each private key:

numPrivateKeys := CkPem_getNumPrivateKeys(pem);
if (numPrivateKeys = 0) then
  begin
    Memo1.Lines.Add(('Error: Expected the PEM to contain private keys.'));
    Exit;
  end;
for i := 1 to numPrivateKeys do
  begin
    privKey := CkPem_GetPrivateKey(pem,i - 1);
    Memo1.Lines.Add(IntToStr(i) + ': ' + IntToStr(CkPrivateKey_getBitLength(privKey)) + ' bits');
    CkPrivateKey_Dispose(privKey);
  end;

CkGlobal_Dispose(chilkatGlob);
CkPem_Dispose(pem);
CkFileAccess_Dispose(fac);

end;

 

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