Encrypt a JWE with a Symmetric Wrapping Key

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetWrappingKey, which sets the symmetric key-wrapping key for a recipient. The key bytes are supplied in a named encoding such as hex or base64.

var
success: Integer;
jwe: TChilkatJwe;
header: TChilkatJsonObject;
base64Key: WideString;
jweCompact: WideString;

begin
success := 0;

jwe := TChilkatJwe.Create(Self);

//  Protected header: AES key-wrap with AES-256-GCM content encryption.
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;

//  Set the symmetric key-wrapping key for recipient 0.  The key bytes are provided in the named
//  encoding (here base64).  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;

jweCompact := jwe.Encrypt('This is the secret content.','utf-8');
if (jwe.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(jwe.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add(jweCompact);