Delphi ActiveX

Encrypt StringBuilder Content to a JWE

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.EncryptSb, which encrypts content supplied in a StringBuilder and writes the resulting JWE into another StringBuilder.

Background. JWE (JSON Web Encryption) protects content with a content-encryption algorithm (the header enc value) while the content-encryption key is managed by the key-management algorithm (the header alg value). This example uses AES key wrapping with a symmetric wrapping key.

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var
success: Integer;
jwe: TChilkatJwe;
header: TChilkatJsonObject;
base64Key: WideString;
sbContent: TChilkatStringBuilder;
sbJwe: TChilkatStringBuilder;

begin
success := 0;

jwe := TChilkatJwe.Create(Self);

//  Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
//  encryption algorithm (enc).
header := TChilkatJsonObject.Create(Self);
header.UpdateString('alg','A256KW');
header.UpdateString('enc','A256GCM');
success := jwe.SetProtectedHeader(header.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(jwe.LastErrorText);
    Exit;
  end;

//  The 256-bit key-wrapping key (base64) for recipient index 0.  In production, obtain the key
//  from a secure source rather than hard-coding it.
base64Key := 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=';
success := jwe.SetWrappingKey(0,base64Key,'base64');
if (success = 0) then
  begin
    Memo1.Lines.Add(jwe.LastErrorText);
    Exit;
  end;

//  Encrypt content supplied in a StringBuilder, writing the resulting JWE into another StringBuilder.
sbContent := TChilkatStringBuilder.Create(Self);
sbContent.Append('This is the secret content.');

sbJwe := TChilkatStringBuilder.Create(Self);
success := jwe.EncryptSb(sbContent.ControlInterface,'utf-8',sbJwe.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(jwe.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add(sbJwe.GetAsString());