Delphi DLL

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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Delphi DLL

var
success: Boolean;
jwe: HCkJwe;
header: HCkJsonObject;
base64Key: PWideChar;
sbContent: HCkStringBuilder;
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 content supplied in a StringBuilder, writing the resulting JWE into another StringBuilder.
sbContent := CkStringBuilder_Create();
CkStringBuilder_Append(sbContent,'This is the secret content.');

sbJwe := CkStringBuilder_Create();
success := CkJwe_EncryptSb(jwe,sbContent,'utf-8',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);
CkStringBuilder_Dispose(sbContent);
CkStringBuilder_Dispose(sbJwe);