Given that there is a DSA public key, declared as follows, and that it is an instance of DSAPublicKeyImpl, we can derive and calculate the DSA private key.
PublicKey pubKey...
DSAPublicKeyImpl dsakey = (DSAPublicKeyImpl) pubKey;DSAParams dsaparams = dsakey.getParams();BigInteger G = dsaparams.getG();BigInteger P = dsaparams.getP();BigInteger Q = dsaparams.getQ();
And after calculating X, where X is declared as BigInteger X...
Thus, we can calculate the DSA private key as follows:
DSAPrivateKey dsapriv = new DSAPrivateKey(X, P, Q, G);
In 2017, with the release of Delphi 10.2 Tokyo, Embarcadero introduced a specialized implementation of the Observer pattern into the System.Classes unit. While it has been in the wild for 9 years, it remains a "hidden" architecture for many, primarily because it serves as the invisible engine behind LiveBindings. Other than live bindings, you can also use the Observer pattern as a way to update component settings to the Windows registry, an .ini file, or persist it elsewhere.
System.Classes