save b33 addresses

libi2pd/LeaseSet.cpp

@@ -299,6 +299,21 @@ namespace data
 			LogPrint (eLogError, "LeaseSet2: unknown signature type ", (int)m_SigType, " in b33");
 	}
 
+	std::string BlindedPublicKey::ToB33 () const
+	{
+		if (m_PublicKey.size () > 32) return ""; // assume 25519
+		uint8_t addr[35]; char str[60]; // TODO: define actual length
+		addr[0] = 0; // flags
+		addr[1] = m_SigType; // sig type
+		addr[2] = m_BlindedSigType; // blinded sig type
+		memcpy (addr + 3, m_PublicKey.data (), m_PublicKey.size ());
+		uint32_t checksum = crc32 (0, addr + 3, m_PublicKey.size ()); 
+		// checksum is Little Endian
+		addr[0] ^= checksum; addr[1] ^= (checksum >> 8); addr[2] ^= (checksum >> 16); 
+		auto l = ByteStreamToBase32 (addr, m_PublicKey.size () + 3, str, 60);
+		return std::string (str, str + l);
+	}
+
 	LeaseSet2::LeaseSet2 (uint8_t storeType, const uint8_t * buf, size_t len, bool storeLeases):
 		LeaseSet (storeLeases), m_StoreType (storeType)
 	{	

libi2pd/LeaseSet.h

@@ -134,6 +134,7 @@ namespace data
 
 			BlindedPublicKey (std::shared_ptr<const IdentityEx> identity, SigningKeyType blindedKeyType = i2p::data::SIGNING_KEY_TYPE_REDDSA_SHA512_ED25519);
 			BlindedPublicKey (const std::string& b33); // from b33 without .b32.i2p			
+			std::string ToB33 () const;
 
 			const uint8_t * GetPublicKey () const { return m_PublicKey.data (); };
 			size_t GetPublicKeyLen () const { return m_PublicKey.size (); };

libi2pd_client/AddressBook.cpp

@@ -189,13 +189,14 @@ namespace client
 		}
 
 		for (const auto& it: addresses)
-		{
+		{	
+			f << it.first << ",";
 			if (it.second->IsIdentHash ())
-			{	
-				f << it.first << "," << it.second->identHash.ToBase32 () << std::endl;
-				num++;
-			}
-			// TODO: save blinded public key
+				f << it.second->identHash.ToBase32 ();
+			else
+				f << it.second->blindedPublicKey->ToB33 ();
+			f << std::endl;
+			num++;
 		}
 		LogPrint (eLogInfo, "Addressbook: ", num, " addresses saved");
 		return num;