From 2951436704e931e25537ca99e994186aa02c7ba6 Mon Sep 17 00:00:00 2001
From: moneromooo-monero <moneromooo-monero@users.noreply.github.com>
Date: Fri, 6 Jul 2018 18:14:08 +0100
Subject: [PATCH] wallet: warn when payment IDs are used

Subaddresses are better for privacy
---
 src/simplewallet/simplewallet.cpp | 19 +++++++++++++++++++
 src/wallet/wallet2.cpp            |  6 ++----
 2 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/src/simplewallet/simplewallet.cpp b/src/simplewallet/simplewallet.cpp
index 16866a80d..eb30dd3f1 100644
--- a/src/simplewallet/simplewallet.cpp
+++ b/src/simplewallet/simplewallet.cpp
@@ -3955,6 +3955,24 @@ void simple_wallet::on_money_received(uint64_t height, const crypto::hash &txid,
     tr("txid ") << txid << ", " <<
     print_money(amount) << ", " <<
     tr("idx ") << subaddr_index;
+
+  const uint64_t warn_height = m_wallet->nettype() == TESTNET ? 1000000 : m_wallet->nettype() == STAGENET ? 50000 : 1650000;
+  if (height >= warn_height)
+  {
+    std::vector<tx_extra_field> tx_extra_fields;
+    parse_tx_extra(tx.extra, tx_extra_fields); // failure ok
+    tx_extra_nonce extra_nonce;
+    if (find_tx_extra_field_by_type(tx_extra_fields, extra_nonce))
+    {
+      crypto::hash8 payment_id8 = crypto::null_hash8;
+      if (get_encrypted_payment_id_from_tx_extra_nonce(extra_nonce.nonce, payment_id8))
+        message_writer() <<
+          tr("NOTE: this transaction uses an encrypted payment ID: consider using subaddresses instead");
+      else
+        message_writer(console_color_red, false) <<
+          tr("WARNING: this transaction uses an unencrypted payment ID: consider using subaddresses instead");
+   }
+  }
   if (m_auto_refresh_refreshing)
     m_cmd_binder.print_prompt();
   else
@@ -4553,6 +4571,7 @@ bool simple_wallet::transfer_main(int transfer_type, const std::vector<std::stri
       return true;
     }
     payment_id_seen = true;
+    message_writer() << tr("Unencrypted payment IDs are bad for privacy: ask the recipient to use subaddresses instead");
   }
 
   uint64_t locked_blocks = 0;
diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index d99371673..d33679d74 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -1553,6 +1553,7 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
       {
         // We got a payment ID to go with this tx
         LOG_PRINT_L2("Found encrypted payment ID: " << payment_id8);
+        MINFO("Consider using subaddresses instead of encrypted payment IDs");
         if (tx_pub_key != null_pkey)
         {
           if (!m_account.get_device().decrypt_payment_id(payment_id8, tx_pub_key, m_account.get_keys().m_view_secret_key))
@@ -1576,12 +1577,9 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
       else if (get_payment_id_from_tx_extra_nonce(extra_nonce.nonce, payment_id))
       {
         LOG_PRINT_L2("Found unencrypted payment ID: " << payment_id);
+        MWARNING("Found unencrypted payment ID: these are bad for privacy, consider using subaddresses instead");
       }
     }
-    else if (get_payment_id_from_tx_extra_nonce(extra_nonce.nonce, payment_id))
-    {
-      LOG_PRINT_L2("Found unencrypted payment ID: " << payment_id);
-    }
 
     for (const auto& i : tx_money_got_in_outs)
     {