Find a JWE Recipient by Header Value

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.FindRecipient, which searches the per-recipient unprotected headers for a member with a given name and string value, and returns the matching recipient index.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

var
success: Boolean;
jwe: HCkJwe;
sbJwe: HCkStringBuilder;
bLoaded: Boolean;
bCaseSensitive: Boolean;
index: Integer;

begin
success := False;

jwe := CkJwe_Create();

//  The file path is relative to the application's current working directory.  An absolute path
//  may also be used.  Supply the path appropriate to your own environment.
//  Load a multi-recipient JWE (JSON serialization) from a file.
sbJwe := CkStringBuilder_Create();
bLoaded := CkStringBuilder_LoadFile(sbJwe,'qa_data/message.jwe','utf-8');
if (bLoaded <> True) then
  begin
    Memo1.Lines.Add('Failed to load the JWE file.');
    Exit;
  end;
success := CkJwe_LoadJweSb(jwe,sbJwe);
if (success = False) then
  begin
    Memo1.Lines.Add(CkJwe__lastErrorText(jwe));
    Exit;
  end;

//  Search the per-recipient unprotected headers for a member named "kid" whose value equals the
//  given string.  Returns the recipient index, or -1 if not found.
bCaseSensitive := True;
index := CkJwe_FindRecipient(jwe,'kid','recipient-key-1',bCaseSensitive);
if (index < 0) then
  begin
    Memo1.Lines.Add('Recipient not found.');
    Exit;
  end;
Memo1.Lines.Add('Found recipient at index ' + IntToStr(index));

CkJwe_Dispose(jwe);
CkStringBuilder_Dispose(sbJwe);