Delphi DLL

Load a JWE from a String

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.LoadJwe, which loads a JWE from its compact serialization string so it can be decrypted.

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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var
success: Boolean;
jwe: HCkJwe;
jweCompact: PWideChar;
base64Key: PWideChar;
content: PWideChar;

begin
success := False;

jwe := CkJwe_Create();

//  Load a JWE from its compact serialization string.
jweCompact := 'eyJhbGciOiJBMjU2S1ciLCJlbmMiOiJBMjU2R0NNIn0.<...>.<iv>.<ciphertext>.<tag>';
success := CkJwe_LoadJwe(jwe,jweCompact);
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;

//  The loaded JWE can now be decrypted.
content := CkJwe__decrypt(jwe,0,'utf-8');
if (CkJwe_getLastMethodSuccess(jwe) = False) then
  begin
    Memo1.Lines.Add(CkJwe__lastErrorText(jwe));
    Exit;
  end;
Memo1.Lines.Add(content);

CkJwe_Dispose(jwe);