Delphi DLL

Load a Private Key from a JWK

Demonstrates the Chilkat PrivateKey.LoadJwk method, which loads a private key from JWK (JSON Web Key) JSON. The only argument is the JWK JSON string. Supported key types are RSA, EC, and Ed25519 (kty=OKP).

Background: JWK is the JSON key format used throughout modern web security — JWT signing, OAuth, OpenID Connect — so this loader is what you use to consume a key from a JWK Set or an identity provider. A private JWK includes the private parameters (d and, for RSA, the CRT values); a public-only JWK omits them. As JSON in the clear, a private JWK must be handled as sensitive material.

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var
success: Boolean;
privKey: HCkPrivateKey;
jwk: PWideChar;

begin
success := False;

//  Demonstrates the PrivateKey.LoadJwk method, which loads a private key from JWK (JSON Web Key)
//  JSON.  The only argument is the JWK JSON string.  Supported key types are RSA, EC, and
//  Ed25519 (kty=OKP).

privKey := CkPrivateKey_Create();

//  A private JWK.  For a real key, "d" (and the other private parameters) would be present.
jwk := '{"kty":"EC","crv":"P-256","x":"...","y":"...","d":"..."}';

success := CkPrivateKey_LoadJwk(privKey,jwk);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(privKey));
    Exit;
  end;

Memo1.Lines.Add('Loaded a ' + CkPrivateKey__keyType(privKey) + ' private key.');

CkPrivateKey_Dispose(privKey);