Delphi ActiveX Requires Chilkat v11.0.0+

Duplicate openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

See more OpenSSL Examples

Demonstrates how to duplicate this OpenSSL command:

openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

The in.dat file can contain text or binary data of any type. The OpenSSL command does the following:

1. Creates a SHA256 digest of the contents of the input file
2. Signs the SHA256 digest using the private key.

Delphi ActiveX

var
success: Integer;
pkey: TPrivateKey;
rsa: TChilkatRsa;
bdFileData: TChilkatBinData;
bdSig: TChilkatBinData;

begin
success := 0;

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

pkey := TPrivateKey.Create(Self);

//  Load the private key from an PEM file:
success := pkey.LoadPemFile('private.pem');
if (success = 0) then
  begin
    Memo1.Lines.Add(pkey.LastErrorText);
    Exit;
  end;

rsa := TChilkatRsa.Create(Self);

//  Import the private key into the RSA component:
success := rsa.UsePrivateKey(pkey.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(rsa.LastErrorText);
    Exit;
  end;

//  OpenSSL uses big-endian.
rsa.LittleEndian := 0;

//  Load the file to be signed.
bdFileData := TChilkatBinData.Create(Self);
success := bdFileData.LoadFile('in.dat');

bdSig := TChilkatBinData.Create(Self);
success := rsa.SignBd(bdFileData.ControlInterface,'sha256',bdSig.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(rsa.LastErrorText);
    Exit;
  end;

//  Save the binary signature to a file.
success := bdSig.WriteFile('signature.sig');
if (success <> 1) then
  begin
    Memo1.Lines.Add('Failed to write signature.sig.');
    Exit;
  end;

Memo1.Lines.Add('Success.');