Delphi DLL

Create a JWS

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.CreateJws, which creates and returns a JWS from the current payload, headers, and signing key.

Background. JWS (JSON Web Signature) integrity-protects a payload with a signature or MAC. The header alg names the algorithm; this example uses HMAC-SHA256 (HS256) with a symmetric MAC key.

Chilkat Delphi DLL Downloads

Download Chilkat for Delphi DLL

Delphi DLL

var
success: Boolean;
jws: HCkJws;
header: HCkJsonObject;
bIncludeBom: Boolean;
base64Key: PWideChar;
jwsCompact: PWideChar;

begin
success := False;

jws := CkJws_Create();

//  Set the protected header for signer 0, specifying the signature algorithm (alg).
header := CkJsonObject_Create();
CkJsonObject_UpdateString(header,'alg','HS256');
success := CkJws_SetProtectedHeader(jws,0,header);
if (success = False) then
  begin
    Memo1.Lines.Add(CkJws__lastErrorText(jws));
    Exit;
  end;

//  Set the payload to be signed.
bIncludeBom := False;
success := CkJws_SetPayload(jws,'This is the content to sign.','utf-8',bIncludeBom);
if (success = False) then
  begin
    Memo1.Lines.Add(CkJws__lastErrorText(jws));
    Exit;
  end;

//  Provide the HMAC key (base64) for signer 0.  In production, obtain the key from a secure source
//  rather than hard-coding it.
base64Key := 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=';
success := CkJws_SetMacKey(jws,0,base64Key,'base64');
if (success = False) then
  begin
    Memo1.Lines.Add(CkJws__lastErrorText(jws));
    Exit;
  end;

//  Create the JWS from the current payload, headers, and signing key.  The returned string is the
//  JWS (compact serialization by default).
jwsCompact := CkJws__createJws(jws);
if (CkJws_getLastMethodSuccess(jws) = False) then
  begin
    Memo1.Lines.Add(CkJws__lastErrorText(jws));
    Exit;
  end;
Memo1.Lines.Add(jwsCompact);

CkJws_Dispose(jws);
CkJsonObject_Dispose(header);