Delphi ActiveX Requires Chilkat v11.0.0+

Duplicate openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

See more RSA Examples

Demonstrates how to duplicate the creation of an RSA signature produced by this OpenSSL command:

openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

Delphi ActiveX

var
success: Integer;
pkey: TPrivateKey;
rsa: TChilkatRsa;
strData: WideString;
base64Sig: WideString;

begin
success := 0;

//  This example assumes 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 RSA PEM file:
success := pkey.LoadPemFile('myKey.pem');

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 BigEndian byte ordering:
rsa.LittleEndian := 0;

//  The resulting signature will be a Base64 string:
rsa.EncodingMode := 'base64';

//  For simplicity, we're not loading
//  the data to be signed from a file.  We are instead simply
//  using a literal string value.  
strData := 'This is the text to be signed.';

//  Hash the input using MD5, and then sign the hash:
//  Other valid hash algorithm choices are "md2" and "sha-1".
base64Sig := rsa.SignStringENC(strData,'md5');

Memo1.Lines.Add(base64Sig);

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