Lazarus Pascal Requires Chilkat v11.0.0+

Renew a DigiCert Certificate from an EST-enabled profile

See more Certificates Examples

Demonstrates how to renew a certificate from an EST-enabled profile in DigiCert​​®​​ Trust Lifecycle Manager. (The certificate must be within the renewal window configured in the certificate profile. The CSR must have same Subject DN values as the original certificate.) Lazarus Pascal

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.Csr,
  Chilkat.HttpResponse,
  Chilkat.BinData,
  Chilkat.PrivateKey,
  Chilkat.Cert,
  Chilkat.Prng,
  Chilkat.Http,
  Chilkat.Ecc;

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

procedure RunDemo;
var
  success: Boolean;
  fortuna: TPrng;
  entropy: string;
  ec: TEcc;
  privKey: TPrivateKey;
  csr: TCsr;
  bdCsr: TBinData;
  http: THttp;
  tlsClientCert: TCert;
  bdTlsClientCertPrivKey: TBinData;
  tlsClientCertPrivKey: TPrivateKey;
  resp: THttpResponse;
  url: string;
  myNewCert: TCert;

begin
  success := False;

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

  //  The example below duplicates the following OpenSSL commands:
  //  
  //  # Name of certificate as argument 1
  //  
  //  # Make new key
  //  openssl ecparam -name prime256v1 -genkey -noout -out ${1}.key.pem
  //  
  //  # Make csr
  //  openssl req -new -sha256 -key ${1}.key.pem -out ${1}.p10.csr -subj "/CN=${1}"
  //  
  //  # Request new cert
  //  curl -v --cacert data/ca.pem --cert data/${1}.pem --key data/${1}.key.pem 
  //      --data-binary @${1}.p10.csr -o ${1}.p7.b64 -H "Content-Type: application/pkcs10" https://clientauth.demo.one.digicert.com/.well-known/est/IOT/simplereenroll
  //  
  //  # Convert to PEM
  //  openssl base64 -d -in ${1}.p7.b64 | openssl pkcs7 -inform DER -outform PEM -print_certs -out ${1}.pem

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

  //  Create a Fortuna PRNG and seed it with system entropy.
  //  This will be our source of random data for generating the ECC private key.
  fortuna := TPrng.Create;
  entropy := fortuna.GetEntropy(32,'base64');
  success := fortuna.AddEntropy(entropy,'base64');

  ec := TEcc.Create;

  //  Generate a random EC private key on the prime256v1 curve.
  privKey := TPrivateKey.Create;
  success := ec.GenKey('prime256v1',fortuna,privKey);
  if (success <> True) then
    begin
      WriteLn(ec.LastErrorText);
      Exit;
    end;

  //  Create the CSR object and set properties.
  csr := TCsr.Create;

  //  Specify your CN
  csr.CommonName := 'mysubdomain.mydomain.com';

  //  Create the CSR using the private key.
  bdCsr := TBinData.Create;
  success := csr.GenCsrBd(privKey,bdCsr);
  if (success = False) then
    begin
      WriteLn(csr.LastErrorText);
      Exit;
    end;

  //  Save the private key and CSR to files.
  privKey.SavePkcs8EncryptedPemFile('password','c:/temp/qa_output/ec_privkey.pem');

  bdCsr.WriteFile('c:/temp/qa_output/csr.pem');

  //  ----------------------------------------------------------------------
  //  Now do the CURL request to POST the CSR and get the new certificate.

  http := THttp.Create;

  tlsClientCert := TCert.Create;
  success := tlsClientCert.LoadFromFile('data/myTlsClientCert.pem');
  if (success = False) then
    begin
      WriteLn(tlsClientCert.LastErrorText);
      Exit;
    end;

  bdTlsClientCertPrivKey := TBinData.Create;
  success := bdTlsClientCertPrivKey.LoadFile('data/myTlsClientCert.key.pem');
  if (success = False) then
    begin
      WriteLn('Failed to load data/myTlsClientCert.key.pem');
      Exit;
    end;

  tlsClientCertPrivKey := TPrivateKey.Create;
  success := tlsClientCertPrivKey.LoadAnyFormat(bdTlsClientCertPrivKey,'');
  if (success = False) then
    begin
      WriteLn(tlsClientCertPrivKey.LastErrorText);
      Exit;
    end;

  success := tlsClientCert.SetPrivateKey(tlsClientCertPrivKey);
  if (success = False) then
    begin
      WriteLn(tlsClientCert.LastErrorText);
      Exit;
    end;

  http.SetSslClientCert(tlsClientCert);

  http.RequireSslCertVerify := True;

  //  The body of the HTTP request contains the binary CSR.
  resp := THttpResponse.Create;
  url := 'https://clientauth.demo.one.digicert.com/.well-known/est/IOT/simplereenroll';
  success := http.HttpBd('POST',url,bdCsr,'application/pkcs10',resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  if (resp.StatusCode <> 200) then
    begin
      WriteLn('response status code = ' + resp.StatusCode);
      WriteLn(resp.BodyStr);
      WriteLn('Failed');
      Exit;
    end;

  //  The response is the Base64 DER of the new certificate.
  myNewCert := TCert.Create;
  success := myNewCert.LoadFromBase64(resp.BodyStr);
  if (success = False) then
    begin
      WriteLn(myNewCert.LastErrorText);
      WriteLn('Cert data = ' + resp.BodyStr);
      WriteLn('Failed.');
      Exit;
    end;

  success := myNewCert.SaveToFile('c:/temp/qa_output/myNewCert.cer');
  if (success = False) then
    begin
      WriteLn(myNewCert.LastErrorText);
      WriteLn('Failed.');
      Exit;
    end;

  WriteLn('Success.');


  fortuna.Free;
  ec.Free;
  privKey.Free;
  csr.Free;
  bdCsr.Free;
  http.Free;
  tlsClientCert.Free;
  bdTlsClientCertPrivKey.Free;
  tlsClientCertPrivKey.Free;
  resp.Free;
  myNewCert.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.