Delphi DLL

Encrypt Binary Content to a JWE

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.EncryptBd, which encrypts binary content held in a BinData and writes the resulting JWE into a 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.

Chilkat Delphi DLL Downloads

Download Chilkat for Delphi DLL

Delphi DLL

var
success: Boolean;
jwe: HCkJwe;
header: HCkJsonObject;
base64Key: PWideChar;
bdContent: HCkBinData;
sbJwe: HCkStringBuilder;

begin
success := False;

jwe := CkJwe_Create();

//  Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
//  encryption algorithm (enc).
header := CkJsonObject_Create();
CkJsonObject_UpdateString(header,'alg','A256KW');
CkJsonObject_UpdateString(header,'enc','A256GCM');
success := CkJwe_SetProtectedHeader(jwe,header);
if (success = False) then
  begin
    Memo1.Lines.Add(CkJwe__lastErrorText(jwe));
    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 := CkJwe_SetWrappingKey(jwe,0,base64Key,'base64');
if (success = False) then
  begin
    Memo1.Lines.Add(CkJwe__lastErrorText(jwe));
    Exit;
  end;

//  Encrypt binary content held in a BinData, writing the resulting JWE into a StringBuilder.
bdContent := CkBinData_Create();
CkBinData_AppendString(bdContent,'Binary content to encrypt.','utf-8');

sbJwe := CkStringBuilder_Create();
success := CkJwe_EncryptBd(jwe,bdContent,sbJwe);
if (success = False) then
  begin
    Memo1.Lines.Add(CkJwe__lastErrorText(jwe));
    Exit;
  end;
Memo1.Lines.Add(CkStringBuilder__getAsString(sbJwe));

CkJwe_Dispose(jwe);
CkJsonObject_Dispose(header);
CkBinData_Dispose(bdContent);
CkStringBuilder_Dispose(sbJwe);