From a2d7a5fb49dedd6c7e024701eefc4c0beade1edd Mon Sep 17 00:00:00 2001
From: moneromooo-monero <moneromooo-monero@users.noreply.github.com>
Date: Sun, 9 Aug 2015 10:09:39 +0100
Subject: 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.
---
 src/wallet/wallet2.cpp | 49 ++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 42 insertions(+), 7 deletions(-)

(limited to 'src/wallet/wallet2.cpp')

diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index 12db73423..3d3f1e4de 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -237,20 +237,24 @@ void wallet2::process_new_transaction(const cryptonote::transaction& tx, uint64_
   crypto::hash payment_id = null_hash;
   if (find_tx_extra_field_by_type(tx_extra_fields, extra_nonce))
   {
-    bool encrypted;
-    if(get_payment_id_from_tx_extra_nonce(extra_nonce.nonce, payment_id, encrypted) && encrypted)
+    crypto::hash8 payment_id8 = null_hash8;
+    if(get_encrypted_payment_id_from_tx_extra_nonce(extra_nonce.nonce, payment_id8))
     {
       // We got a payment ID to go with this tx
-      LOG_PRINT_L2("Found encrypted payment ID: " << payment_id);
+      LOG_PRINT_L2("Found encrypted payment ID: " << payment_id8);
       if (tx_pub_key != null_pkey)
       {
-        if (!decrypt_payment_id(payment_id, tx_pub_key, m_account.get_keys().m_view_secret_key))
+        if (!decrypt_payment_id(payment_id8, tx_pub_key, m_account.get_keys().m_view_secret_key))
         {
-          LOG_PRINT_L0("Failed to decrypt payment ID: " << payment_id);
+          LOG_PRINT_L0("Failed to decrypt payment ID: " << payment_id8);
         }
         else
         {
-          LOG_PRINT_L2("Decrypted payment ID: " << payment_id);
+          LOG_PRINT_L2("Decrypted payment ID: " << payment_id8);
+          // put the 64 bit decrypted payment id in the first 8 bytes
+          memcpy(payment_id.data, payment_id8.data, 8);
+          // rest is already 0, but guard against code changes above
+          memset(payment_id.data + 8, 0, 24);
         }
       }
       else
@@ -258,6 +262,10 @@ void wallet2::process_new_transaction(const cryptonote::transaction& tx, uint64_
         LOG_PRINT_L1("No public key found in tx, unable to decrypt payment id");
       }
     }
+    else if (get_payment_id_from_tx_extra_nonce(extra_nonce.nonce, payment_id))
+    {
+      LOG_PRINT_L2("Found unencrypted payment ID: " << payment_id);
+    }
   }
   uint64_t received = (tx_money_spent_in_ins < tx_money_got_in_outs) ? tx_money_got_in_outs - tx_money_spent_in_ins : 0;
   if (0 < received)
@@ -783,7 +791,7 @@ bool wallet2::wallet_valid_path_format(const std::string& file_path)
   return !file_path.empty();
 }
 //----------------------------------------------------------------------------------------------------
-bool wallet2::parse_payment_id(const std::string& payment_id_str, crypto::hash& payment_id)
+bool wallet2::parse_long_payment_id(const std::string& payment_id_str, crypto::hash& payment_id)
 {
   cryptonote::blobdata payment_id_data;
   if(!epee::string_tools::parse_hexstr_to_binbuff(payment_id_str, payment_id_data))
@@ -796,6 +804,33 @@ bool wallet2::parse_payment_id(const std::string& payment_id_str, crypto::hash&
   return true;
 }
 //----------------------------------------------------------------------------------------------------
+bool wallet2::parse_short_payment_id(const std::string& payment_id_str, crypto::hash8& payment_id)
+{
+  cryptonote::blobdata payment_id_data;
+  if(!epee::string_tools::parse_hexstr_to_binbuff(payment_id_str, payment_id_data))
+    return false;
+
+  if(sizeof(crypto::hash8) != payment_id_data.size())
+    return false;
+
+  payment_id = *reinterpret_cast<const crypto::hash8*>(payment_id_data.data());
+  return true;
+}
+//----------------------------------------------------------------------------------------------------
+bool wallet2::parse_payment_id(const std::string& payment_id_str, crypto::hash& payment_id)
+{
+  if (parse_long_payment_id(payment_id_str, payment_id))
+    return true;
+  crypto::hash8 payment_id8;
+  if (parse_short_payment_id(payment_id_str, payment_id8))
+  {
+    memcpy(payment_id.data, payment_id8.data, 8);
+    memset(payment_id.data + 8, 0, 24);
+    return true;
+  }
+  return false;
+}
+//----------------------------------------------------------------------------------------------------
 bool wallet2::prepare_file_names(const std::string& file_path)
 {
   do_prepare_file_names(file_path, m_keys_file, m_wallet_file);
-- 
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