Beispiel #1
0
	void NTCPSession::CreateAESKey (uint8_t * pubKey, uint8_t * aesKey)
	{
		CryptoPP::DH dh (elgp, elgg);
		uint8_t sharedKey[256];
		if (!dh.Agree (sharedKey, m_DHKeysPair->privateKey, pubKey))
		{    
		    LogPrint ("Couldn't create shared key");
			Terminate ();
			return;
		};

		if (sharedKey[0] & 0x80)
		{
			aesKey[0] = 0;
			memcpy (aesKey + 1, sharedKey, 31);
		}	
		else if (sharedKey[0])	
			memcpy (aesKey, sharedKey, 32);
		else
		{
			// find first non-zero byte
			uint8_t * nonZero = sharedKey + 1;
			while (!*nonZero)
			{
				nonZero++;
				if (nonZero - sharedKey > 32)
				{
					LogPrint ("First 32 bytes of shared key is all zeros. Ignored");
					return;
				}	
			}
			memcpy (aesKey, nonZero, 32);
		}
	}	
Beispiel #2
0
	void NTCPSession::CreateAESKey (uint8_t * pubKey, uint8_t * aesKey)
	{
		CryptoPP::DH dh (elgp, elgg);
		CryptoPP::SecByteBlock secretKey(dh.AgreedValueLength());
		if (!dh.Agree (secretKey, i2p::context.GetPrivateKey (), pubKey))
		{    
		    LogPrint ("Couldn't create shared key");
			Terminate ();
			return;
		};

		if (secretKey[0] & 0x80)
		{
			aesKey[0] = 0;
			memcpy (aesKey + 1, secretKey, 31);
		}	
		else	
			memcpy (aesKey, secretKey, 32);
	}