Delphi DLL Requires Chilkat v11.0.0+

Create PKCS1 RSA Signature with PEM Private Key

See more RSA Examples

Demonstrates how to load a private key from a PEM file and create a PKCS1 RSA digital signature. Delphi DLL

var
success: Boolean;
pkey: HCkPrivateKey;
rsa: HCkRsa;
strData: PWideChar;
hexSig: PWideChar;

begin
success := False;

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

pkey := CkPrivateKey_Create();

//  Load the private key from an RSA PEM file:
success := CkPrivateKey_LoadPemFile(pkey,'pvkey2_rsa.pem');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(pkey));
    Exit;
  end;

rsa := CkRsa_Create();

//  Import the private key into the RSA object:
success := CkRsa_UsePrivateKey(rsa,pkey);
if (success = False) then
  begin
    Memo1.Lines.Add(CkRsa__lastErrorText(rsa));
    Exit;
  end;

//  Get the signature as hex.
CkRsa_putEncodingMode(rsa,'hex');

strData := 'This is the string to be signed.';

//  Sign the string using the sha-1 hash algorithm.
//  Other valid choices are "md2", "md5", "sha256",
//  "sha384", and "sha512".
hexSig := CkRsa__signStringENC(rsa,strData,'sha-1');

Memo1.Lines.Add(hexSig);

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

CkPrivateKey_Dispose(pkey);
CkRsa_Dispose(rsa);