From 896185d7ed3fa23415424c608f0897d6139640f4 Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Sat, 4 May 2013 16:10:09 +0200
Subject: Make signature cache store CPubKeys

---
 src/script.cpp | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

(limited to 'src/script.cpp')

diff --git a/src/script.cpp b/src/script.cpp
index 2c7fd59874..b411666353 100644
--- a/src/script.cpp
+++ b/src/script.cpp
@@ -16,7 +16,7 @@ using namespace boost;
 #include "sync.h"
 #include "util.h"
 
-bool CheckSig(vector<unsigned char> vchSig, vector<unsigned char> vchPubKey, CScript scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, int flags);
+bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char> &vchPubKey, const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, int flags);
 
 
 
@@ -1033,13 +1033,13 @@ class CSignatureCache
 {
 private:
      // sigdata_type is (signature hash, signature, public key):
-    typedef boost::tuple<uint256, std::vector<unsigned char>, std::vector<unsigned char> > sigdata_type;
+    typedef boost::tuple<uint256, std::vector<unsigned char>, CPubKey> sigdata_type;
     std::set< sigdata_type> setValid;
     boost::shared_mutex cs_sigcache;
 
 public:
     bool
-    Get(uint256 hash, const std::vector<unsigned char>& vchSig, const std::vector<unsigned char>& pubKey)
+    Get(const uint256 &hash, const std::vector<unsigned char>& vchSig, const CPubKey& pubKey)
     {
         boost::shared_lock<boost::shared_mutex> lock(cs_sigcache);
 
@@ -1050,7 +1050,7 @@ public:
         return false;
     }
 
-    void Set(uint256 hash, const std::vector<unsigned char>& vchSig, const std::vector<unsigned char>& pubKey)
+    void Set(const uint256 &hash, const std::vector<unsigned char>& vchSig, const CPubKey& pubKey)
     {
         // DoS prevention: limit cache size to less than 10MB
         // (~200 bytes per cache entry times 50,000 entries)
@@ -1081,11 +1081,15 @@ public:
     }
 };
 
-bool CheckSig(vector<unsigned char> vchSig, vector<unsigned char> vchPubKey, CScript scriptCode,
+bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char> &vchPubKey, const CScript &scriptCode,
               const CTransaction& txTo, unsigned int nIn, int nHashType, int flags)
 {
     static CSignatureCache signatureCache;
 
+    CPubKey pubkey(vchPubKey);
+    if (!pubkey.IsValid())
+        return false;
+
     // Hash type is one byte tacked on to the end of the signature
     if (vchSig.empty())
         return false;
@@ -1097,14 +1101,14 @@ bool CheckSig(vector<unsigned char> vchSig, vector<unsigned char> vchPubKey, CSc
 
     uint256 sighash = SignatureHash(scriptCode, txTo, nIn, nHashType);
 
-    if (signatureCache.Get(sighash, vchSig, vchPubKey))
+    if (signatureCache.Get(sighash, vchSig, pubkey))
         return true;
 
-    if (!CPubKey(vchPubKey).Verify(sighash, vchSig))
+    if (!pubkey.Verify(sighash, vchSig))
         return false;
 
     if (!(flags & SCRIPT_VERIFY_NOCACHE))
-        signatureCache.Set(sighash, vchSig, vchPubKey);
+        signatureCache.Set(sighash, vchSig, pubkey);
 
     return true;
 }
-- 
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