Implement 40250 classic client port

extension/third_party/cryptopp/elgamal.cpp

@@ -0,0 +1,22 @@
+// elgamal.cpp - originally written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+#include "elgamal.h"
+#include "asn.h"
+#include "nbtheory.h"
+
+// Squash MS LNK4221 and libtool warnings
+extern const char ELGAMAL_FNAME[] = __FILE__;
+
+NAMESPACE_BEGIN(CryptoPP)
+
+#if defined(CRYPTOPP_DEBUG) && !defined(CRYPTOPP_DOXYGEN_PROCESSING)
+void ElGamal_TestInstantiations()
+{
+	ElGamalEncryptor test1(1, 1, 1);
+	ElGamalDecryptor test2(NullRNG(), 123);
+	ElGamalEncryptor test3(test2);
+}
+#endif
+
+NAMESPACE_END