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(Delphi ActiveX) Compute JWK Thumbprint for RSA and EC Public Keys

Demonstrates how to compute a JSON Web Key thumbprint for a public key (RSA or ECC).

Note: This example requires Chilkat v9.5.0.66 or greater.

Chilkat for Delphi Downloads

Chilkat ActiveX DLL for Delphi

Chilkat non-ActiveX DLL for Delphi

* The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_v9_5_0_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
pubKey: TPublicKey;
sb: TChilkatStringBuilder;
success: Integer;

begin
pubKey := TPublicKey.Create(Self);

// A public key can be loaded from any format (binary DER, PEM, etc.)
// This example will load the public keys from JWK format, 
// and will then compute the JWK thumbprint.

// First do it for an RSA public key...

sb := TChilkatStringBuilder.Create(Self);
sb.Append('{');
sb.Append('"kty": "RSA",');
sb.Append('"n": "0vx7agoebGcQSuuPiLJXZptN9nndrQmbXEps2aiAFbWhM78LhWx4cbbfAAt');
sb.Append('VT86zwu1RK7aPFFxuhDR1L6tSoc_BJECPebWKRXjBZCiFV4n3oknjhMstn6');
sb.Append('4tZ_2W-5JsGY4Hc5n9yBXArwl93lqt7_RN5w6Cf0h4QyQ5v-65YGjQR0_FD');
sb.Append('W2QvzqY368QQMicAtaSqzs8KJZgnYb9c7d0zgdAZHzu6qMQvRL5hajrn1n9');
sb.Append('1CbOpbISD08qNLyrdkt-bFTWhAI4vMQFh6WeZu0fM4lFd2NcRwr3XPksINH');
sb.Append('aQ-G_xBniIqbw0Ls1jF44-csFCur-kEgU8awapJzKnqDKgw",');
sb.Append('"e": "AQAB",');
sb.Append('"alg": "RS256",');
sb.Append('"kid": "2011-04-29"');
sb.Append('}');

// The JWK format is automatically detected..
success := pubKey.LoadFromString(sb.GetAsString());
if (success <> 1) then
  begin
    Memo1.Lines.Add(pubKey.LastErrorText);
    Exit;
  end;

// Get the JWK thumbprint (using SHA256)
Memo1.Lines.Add('JWK thumbprint: ' + pubKey.GetJwkThumbprint('SHA256'));

// Output:
// JWK thumbprint: NzbLsXh8uDCcd-6MNwXF4W_7noWXFZAfHkxZsRGC9Xs

// --------------------------------------------------------------
// Now let's do an EC public key:
sb.Clear();
sb.Append('{ ');
sb.Append('  "kty": "EC",');
sb.Append('  "crv": "P-256",');
sb.Append('  "x": "tDeeYABgKEAbWicYPCEEI8sP4SRIhHKcHDW7VqrB4LA",');
sb.Append('  "y": "J08HOoIZ0rX2Me3bNFZUltfxIk1Hrc8FsLu8VaSxsMI"');
sb.Append('}');

success := pubKey.LoadFromString(sb.GetAsString());
if (success <> 1) then
  begin
    Memo1.Lines.Add(pubKey.LastErrorText);
    Exit;
  end;

// Get the JWK thumbprint (using SHA256)
Memo1.Lines.Add('JWK thumbprint: ' + pubKey.GetJwkThumbprint('SHA256'));

// Output:
// JWK thumbprint: 8fm8079s3nu4FLV_7dVJoJ69A8XCXn7Za2mtaWCnxR4
end;

 

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