don't create ECIESx25519 again if key was not changed

libi2pd_client/I2CP.cpp

@@ -60,7 +60,11 @@ namespace client
 
 	void I2CPDestination::SetECIESx25519EncryptionPrivateKey (const uint8_t * key)
 	{
-		m_ECIESx25519Decryptor = std::make_shared<i2p::crypto::ECIESX25519AEADRatchetDecryptor>(key, true); // calculate public
+		if (!m_ECIESx25519Decryptor || memcmp (m_ECIESx25519PrivateKey, key, 32)) // new key?
+		{	
+			m_ECIESx25519Decryptor = std::make_shared<i2p::crypto::ECIESX25519AEADRatchetDecryptor>(key, true); // calculate public
+			memcpy (m_ECIESx25519PrivateKey, key, 32);
+		}	
 	}	
 		
 	bool I2CPDestination::Decrypt (const uint8_t * encrypted, uint8_t * data, BN_CTX * ctx, i2p::data::CryptoKeyType preferredCrypto) const

libi2pd_client/I2CP.h

@@ -105,6 +105,7 @@ namespace client
 			i2p::data::CryptoKeyType m_EncryptionKeyType;
 			std::shared_ptr<i2p::crypto::CryptoKeyDecryptor> m_Decryptor; // standard
 			std::shared_ptr<i2p::crypto::ECIESX25519AEADRatchetDecryptor> m_ECIESx25519Decryptor;
+			uint8_t m_ECIESx25519PrivateKey[32];
 			uint64_t m_LeaseSetExpirationTime;
 	};