(Delphi DLL) Change Password for Java KeyStore File

Demonstrates how to load a Java keystore, change the password, and save using the new password. If the Java keystore contains only trusted root certificates, then it's simply a matter of loading the JKS with the existing password, and then saving with a new password. If the JKS contains private key entries, then each private key entry must be re-keyed using the new password by calling the ChangePassword method.

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, JavaKeyStore;

...

procedure TForm1.Button1Click(Sender: TObject);
var
jks: HCkJavaKeyStore;
oldJksPassword: PWideChar;
newJksPassword: PWideChar;
jksPath: PWideChar;
success: Boolean;
numPrivateKeys: Integer;
i: Integer;

begin
// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

jks := CkJavaKeyStore_Create();

oldJksPassword := 'existingPassword';
newJksPassword := 'newPassword';
jksPath := '/someDir/keyStore.jks';

// Load the Java keystore from a file.
success := CkJavaKeyStore_LoadFile(jks,oldJksPassword,jksPath);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkJavaKeyStore__lastErrorText(jks));
    Exit;
  end;

// If the JKS contains private key entries, then each
// must be re-keyed with the new password by calling ChangePassword.
numPrivateKeys := CkJavaKeyStore_getNumPrivateKeys(jks);

i := 0;
while i < numPrivateKeys do
  begin

    success := CkJavaKeyStore_ChangePassword(jks,i,oldJksPassword,newJksPassword);
    if (success <> True) then
      begin
        Memo1.Lines.Add(CkJavaKeyStore__lastErrorText(jks));
        Exit;
      end;

    i := i + 1;
  end;

// Write the JKS using the new password for the JKS file's keyed digest.
success := CkJavaKeyStore_ToFile(jks,newJksPassword,jksPath);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkJavaKeyStore__lastErrorText(jks));
    Exit;
  end;

Memo1.Lines.Add('Updated the password for the Java keystore file.');

CkJavaKeyStore_Dispose(jks);

end;