encrypted payment ids are now 64 bit, instead of 256 bit

Pros:
 - smaller on the blockchain
 - shorter integrated addresses

Cons:
 - less sparseness
 - less ability to embed actual information

The boolean argument to encrypt payment ids is now gone from the
RPC calls, since the decision is made based on the length of the
payment id passed.

1 files changed, 36 insertions, 22 deletions

diff --git a/src/wallet/wallet_rpc_server.cpp b/src/wallet/wallet_rpc_server.cpp
index 4797f76a2..7dfd64eef 100644
--- a/src/wallet/wallet_rpc_server.cpp
+++ b/src/wallet/wallet_rpc_server.cpp
@@ -117,14 +117,15 @@ namespace tools
   }
 
   //------------------------------------------------------------------------------------------------------------------------------
-  bool wallet_rpc_server::validate_transfer(const std::list<wallet_rpc::transfer_destination> destinations, std::string payment_id, bool encrypt_payment_id, std::vector<cryptonote::tx_destination_entry>& dsts, std::vector<uint8_t>& extra, epee::json_rpc::error& er)
+  bool wallet_rpc_server::validate_transfer(const std::list<wallet_rpc::transfer_destination> destinations, std::string payment_id, std::vector<cryptonote::tx_destination_entry>& dsts, std::vector<uint8_t>& extra, epee::json_rpc::error& er)
   {
-    crypto::hash integrated_payment_id = cryptonote::null_hash;
+    crypto::hash8 integrated_payment_id = cryptonote::null_hash8;
+    std::string extra_nonce;
     for (auto it = destinations.begin(); it != destinations.end(); it++)
     {
       cryptonote::tx_destination_entry de;
       bool has_payment_id;
-      crypto::hash new_payment_id;
+      crypto::hash8 new_payment_id;
       if(!get_account_integrated_address_from_str(de.addr, has_payment_id, new_payment_id, m_wallet.testnet(), it->address))
       {
         er.code = WALLET_RPC_ERROR_CODE_WRONG_ADDRESS;
@@ -136,17 +137,15 @@ namespace tools
 
       if (has_payment_id)
       {
-        if (!payment_id.empty() || integrated_payment_id != cryptonote::null_hash)
+        if (!payment_id.empty() || integrated_payment_id != cryptonote::null_hash8)
         {
           er.code = WALLET_RPC_ERROR_CODE_WRONG_PAYMENT_ID;
           er.message = "A single payment id is allowed per transaction";
           return false;
         }
         integrated_payment_id = new_payment_id;
+        cryptonote::set_encrypted_payment_id_to_tx_extra_nonce(extra_nonce, integrated_payment_id);
       }
-
-      // integrated addresses imply encrypted payment id
-      encrypt_payment_id = true;
     }
 
     if (!payment_id.empty())
@@ -155,17 +154,23 @@ namespace tools
       /* Just to clarify */
       const std::string& payment_id_str = payment_id;
 
-      crypto::hash payment_id;
+      crypto::hash long_payment_id;
+      crypto::hash8 short_payment_id;
+
       /* Parse payment ID */
-      if (!wallet2::parse_payment_id(payment_id_str, payment_id)) {
+      if (wallet2::parse_long_payment_id(payment_id_str, long_payment_id)) {
+        cryptonote::set_payment_id_to_tx_extra_nonce(extra_nonce, long_payment_id);
+      }
+      /* or short payment ID */
+      else if (!wallet2::parse_short_payment_id(payment_id_str, short_payment_id)) {
+        cryptonote::set_encrypted_payment_id_to_tx_extra_nonce(extra_nonce, short_payment_id);
+      }
+      else {
         er.code = WALLET_RPC_ERROR_CODE_WRONG_PAYMENT_ID;
-        er.message = "Payment id has invalid format: \"" + payment_id_str + "\", expected 64-character string";
+        er.message = "Payment id has invalid format: \"" + payment_id_str + "\", expected 16 or 64 character string";
         return false;
       }
 
-      std::string extra_nonce;
-      cryptonote::set_payment_id_to_tx_extra_nonce(extra_nonce, payment_id, encrypt_payment_id);
-      
       /* Append Payment ID data into extra */
       if (!cryptonote::add_extra_nonce_to_tx_extra(extra, extra_nonce)) {
         er.code = WALLET_RPC_ERROR_CODE_WRONG_PAYMENT_ID;
@@ -192,7 +197,7 @@ namespace tools
     }
 
     // validate the transfer requested and populate dsts & extra
-    if (!validate_transfer(req.destinations, req.payment_id, req.encrypt_payment_id, dsts, extra, er))
+    if (!validate_transfer(req.destinations, req.payment_id, dsts, extra, er))
     {
       return false;
     }
@@ -250,7 +255,7 @@ namespace tools
     }
 
     // validate the transfer requested and populate dsts & extra; RPC_TRANSFER::request and RPC_TRANSFER_SPLIT::request are identical types.
-    if (!validate_transfer(req.destinations, req.payment_id, req.encrypt_payment_id, dsts, extra, er))
+    if (!validate_transfer(req.destinations, req.payment_id, dsts, extra, er))
     {
       return false;
     }
@@ -342,14 +347,14 @@ namespace tools
   {
     try
     {
-      crypto::hash payment_id;
+      crypto::hash8 payment_id;
       if (req.payment_id.empty())
       {
-        crypto::generate_random_bytes(32, payment_id.data);
+        crypto::generate_random_bytes(8, payment_id.data);
       }
       else
       {
-        if (!tools::wallet2::parse_payment_id(req.payment_id,payment_id))
+        if (!tools::wallet2::parse_short_payment_id(req.payment_id,payment_id))
         {
           er.code = WALLET_RPC_ERROR_CODE_WRONG_PAYMENT_ID;
           er.message = "Invalid payment ID";
@@ -374,7 +379,7 @@ namespace tools
     try
     {
       cryptonote::account_public_address address;
-      crypto::hash payment_id;
+      crypto::hash8 payment_id;
       bool has_payment_id;
 
       if(!get_account_integrated_address_from_str(address, has_payment_id, payment_id, m_wallet.testnet(), req.integrated_address))
@@ -488,6 +493,7 @@ namespace tools
     for (auto & payment_id_str : req.payment_ids)
     {
       crypto::hash payment_id;
+      crypto::hash8 payment_id8;
       cryptonote::blobdata payment_id_blob;
 
       // TODO - should the whole thing fail because of one bad id?
@@ -499,15 +505,23 @@ namespace tools
         return false;
       }
 
-      if(sizeof(payment_id) != payment_id_blob.size())
+      if(sizeof(payment_id) == payment_id_blob.size())
+      {
+        payment_id = *reinterpret_cast<const crypto::hash*>(payment_id_blob.data());
+      }
+      else if(sizeof(payment_id8) == payment_id_blob.size())
+      {
+        payment_id8 = *reinterpret_cast<const crypto::hash8*>(payment_id_blob.data());
+        memcpy(payment_id.data, payment_id8.data, 8);
+        memset(payment_id.data + 8, 0, 24);
+      }
+      else
       {
         er.code = WALLET_RPC_ERROR_CODE_WRONG_PAYMENT_ID;
         er.message = "Payment ID has invalid size: " + payment_id_str;
         return false;
       }
 
-      payment_id = *reinterpret_cast<const crypto::hash*>(payment_id_blob.data());
-
       std::list<wallet2::payment_details> payment_list;
       m_wallet.get_payments(payment_id, payment_list, req.min_block_height);