long ElGamal private key

Destination.cpp

@@ -1,13 +1,13 @@
 #include <algorithm>
 #include <cassert>
 #include <boost/lexical_cast.hpp>
-#include <cryptopp/dh.h>
 #include "Log.h"
 #include "util.h"
+#include "ElGamal.h"
 #include "Timestamp.h"
 #include "NetDb.h"
-#include "Destination.h"
 #include "ClientContext.h"
+#include "Destination.h"
 
 namespace i2p
 {
@@ -19,8 +19,7 @@ namespace client
 		m_Keys (keys), m_LeaseSet (nullptr), m_IsPublic (isPublic), m_PublishReplyToken (0),
 		m_DatagramDestination (nullptr), m_PublishConfirmationTimer (m_Service)
 	{
-		CryptoPP::DH dh (i2p::crypto::elgp, i2p::crypto::elgg);
-		dh.GenerateKeyPair(i2p::context.GetRandomNumberGenerator (), m_EncryptionPrivateKey, m_EncryptionPublicKey);
+		i2p::crypto::GenerateElGamalKeyPair(i2p::context.GetRandomNumberGenerator (), m_EncryptionPrivateKey, m_EncryptionPublicKey);
 		int inboundTunnelLen = DEFAULT_INBOUND_TUNNEL_LENGTH;
 		int outboundTunnelLen = DEFAULT_OUTBOUND_TUNNEL_LENGTH;
 		if (params)

ElGamal.h

@@ -4,6 +4,7 @@
 #include <inttypes.h>
 #include <cryptopp/integer.h>
 #include <cryptopp/osrng.h>
+#include <cryptopp/dh.h>
 #include <cryptopp/sha.h>
 #include "CryptoConst.h"
 #include "Log.h"
@@ -70,6 +71,17 @@ namespace crypto
 		memcpy (data, m + 33, 222);
 		return true;
 	}	
+
+	inline void GenerateElGamalKeyPair (CryptoPP::RandomNumberGenerator& rnd, uint8_t * priv, uint8_t * pub)
+	{
+#if defined(__x86_64__) || defined(__i386__) || defined(_MSC_VER)	
+		rnd.GenerateBlock (priv, 256);
+		a_exp_b_mod_c (elgg, CryptoPP::Integer (priv, 256), elgp).Encode (pub, 256);
+#else
+		CryptoPP::DH dh (elgp, elgg);
+		dh.GenerateKeyPair(rnd, priv, pub);	
+#endif		
+	}	
 }
 }	
 

Identity.cpp

@@ -5,6 +5,7 @@
 #include <cryptopp/dsa.h>
 #include "base64.h"
 #include "CryptoConst.h"
+#include "ElGamal.h"
 #include "RouterContext.h"
 #include "Identity.h"
 #include "I2PEndian.h"
@@ -509,8 +510,7 @@ namespace data
 		Keys keys;		
 		auto& rnd = i2p::context.GetRandomNumberGenerator ();
 		// encryption
-		CryptoPP::DH dh (i2p::crypto::elgp, i2p::crypto::elgg);
-		dh.GenerateKeyPair(rnd, keys.privateKey, keys.publicKey);
+		i2p::crypto::GenerateElGamalKeyPair(rnd, keys.privateKey, keys.publicKey);
 		// signing
 		i2p::crypto::CreateDSARandomKeys (rnd, keys.signingPrivateKey, keys.signingKey);	
 		return keys;