Make CPubKey statically allocated

src/hash.h

@@ -105,15 +105,22 @@ uint256 SerializeHash(const T& obj, int nType=SER_GETHASH, int nVersion=PROTOCOL
     return ss.GetHash();
 }
 
-inline uint160 Hash160(const std::vector<unsigned char>& vch)
+template<typename T1>
+inline uint160 Hash160(const T1 pbegin, const T1 pend)
 {
+    static unsigned char pblank[1];
     uint256 hash1;
-    SHA256(&vch[0], vch.size(), (unsigned char*)&hash1);
+    SHA256((pbegin == pend ? pblank : (unsigned char*)&pbegin[0]), (pend - pbegin) * sizeof(pbegin[0]), (unsigned char*)&hash1);
     uint160 hash2;
     RIPEMD160((unsigned char*)&hash1, sizeof(hash1), (unsigned char*)&hash2);
     return hash2;
 }
 
+inline uint160 Hash160(const std::vector<unsigned char>& vch)
+{
+    return Hash160(vch.begin(), vch.end());
+}
+
 unsigned int MurmurHash3(unsigned int nHashSeed, const std::vector<unsigned char>& vDataToHash);
 
 #endif

src/key.cpp

@@ -258,11 +258,11 @@ CPrivKey CKey::GetPrivKey() const
 
 bool CKey::SetPubKey(const CPubKey& vchPubKey)
 {
-    const unsigned char* pbegin = &vchPubKey.vchPubKey[0];
-    if (o2i_ECPublicKey(&pkey, &pbegin, vchPubKey.vchPubKey.size()))
+    const unsigned char* pbegin = vchPubKey.begin();
+    if (o2i_ECPublicKey(&pkey, &pbegin, vchPubKey.size()))
     {
         fSet = true;
-        if (vchPubKey.vchPubKey.size() == 33)
+        if (vchPubKey.size() == 33)
             SetCompressedPubKey();
         return true;
     }
@@ -276,11 +276,13 @@ CPubKey CKey::GetPubKey() const
     int nSize = i2o_ECPublicKey(pkey, NULL);
     if (!nSize)
         throw key_error("CKey::GetPubKey() : i2o_ECPublicKey failed");
-    std::vector<unsigned char> vchPubKey(nSize, 0);
-    unsigned char* pbegin = &vchPubKey[0];
+    assert(nSize <= 65);
+    CPubKey ret;
+    unsigned char *pbegin = ret.begin();
     if (i2o_ECPublicKey(pkey, &pbegin) != nSize)
         throw key_error("CKey::GetPubKey() : i2o_ECPublicKey returned unexpected size");
-    return CPubKey(vchPubKey);
+    assert((int)ret.size() == nSize);
+    return ret;
 }
 
 bool CKey::Sign(uint256 hash, std::vector<unsigned char>& vchSig)

src/key.h

@@ -63,38 +63,95 @@ public:
 /** An encapsulated public key. */
 class CPubKey {
 private:
-    std::vector<unsigned char> vchPubKey;
+    unsigned char vch[65];
+
+    unsigned int static GetLen(unsigned char chHeader) {
+        if (chHeader == 2 || chHeader == 3)
+            return 33;
+        if (chHeader == 4 || chHeader == 6 || chHeader == 7)
+            return 65;
+        return 0;
+    }
+
+    unsigned char *begin() {
+        return vch;
+    }
+
     friend class CKey;
 
 public:
-    CPubKey() { }
-    CPubKey(const std::vector<unsigned char> &vchPubKeyIn) : vchPubKey(vchPubKeyIn) { }
-    friend bool operator==(const CPubKey &a, const CPubKey &b) { return a.vchPubKey == b.vchPubKey; }
-    friend bool operator!=(const CPubKey &a, const CPubKey &b) { return a.vchPubKey != b.vchPubKey; }
-    friend bool operator<(const CPubKey &a, const CPubKey &b) { return a.vchPubKey < b.vchPubKey; }
+    CPubKey() { vch[0] = 0xFF; }
+
+    CPubKey(const std::vector<unsigned char> &vchPubKeyIn) {
+        int len = vchPubKeyIn.empty() ? 0 : GetLen(vchPubKeyIn[0]);
+        if (len) {
+            memcpy(vch, &vchPubKeyIn[0], len);
+        } else {
+            vch[0] = 0xFF;
+        }
+    }
+
+    unsigned int size() const {
+        return GetLen(vch[0]);
+    }
+
+    const unsigned char *begin() const {
+        return vch;
+    }
 
-    IMPLEMENT_SERIALIZE(
-        READWRITE(vchPubKey);
-    )
+    const unsigned char *end() const {
+        return vch+size();
+    }
+
+    friend bool operator==(const CPubKey &a, const CPubKey &b) { return memcmp(a.vch, b.vch, a.size()) == 0; }
+    friend bool operator!=(const CPubKey &a, const CPubKey &b) { return memcmp(a.vch, b.vch, a.size()) != 0; }
+    friend bool operator<(const CPubKey &a, const CPubKey &b) {
+        return a.vch[0] < b.vch[0] ||
+               (a.vch[0] == b.vch[0] && memcmp(a.vch+1, b.vch+1, a.size() - 1) < 0);
+    }
+
+    unsigned int GetSerializeSize(int nType, int nVersion) const {
+        return size() + 1;
+    }
+
+    template<typename Stream> void Serialize(Stream &s, int nType, int nVersion) const {
+        unsigned int len = size();
+        ::Serialize(s, VARINT(len), nType, nVersion);
+        s.write((char*)vch, len);
+    }
+
+    template<typename Stream> void Unserialize(Stream &s, int nType, int nVersion) {
+        unsigned int len;
+        ::Unserialize(s, VARINT(len), nType, nVersion);
+        if (len <= 65) {
+            s.read((char*)vch, len);
+        } else {
+            // invalid pubkey
+            vch[0] = 0xFF;
+            char dummy;
+            while (len--)
+                s.read(&dummy, 1);
+        }
+    }
 
     CKeyID GetID() const {
-        return CKeyID(Hash160(vchPubKey));
+        return CKeyID(Hash160(vch, vch+size()));
     }
 
     uint256 GetHash() const {
-        return Hash(vchPubKey.begin(), vchPubKey.end());
+        return Hash(vch, vch+size());
     }
 
     bool IsValid() const {
-        return vchPubKey.size() == 33 || vchPubKey.size() == 65;
+        return size() > 0;
     }
 
     bool IsCompressed() const {
-        return vchPubKey.size() == 33;
+        return size() == 33;
     }
 
     std::vector<unsigned char> Raw() const {
-        return vchPubKey;
+        return std::vector<unsigned char>(vch, vch+size());
     }
 };
 

src/rpcwallet.cpp

@@ -1445,7 +1445,7 @@ public:
         CPubKey vchPubKey;
         pwalletMain->GetPubKey(keyID, vchPubKey);
         obj.push_back(Pair("isscript", false));
-        obj.push_back(Pair("pubkey", HexStr(vchPubKey.Raw())));
+        obj.push_back(Pair("pubkey", HexStr(vchPubKey)));
         obj.push_back(Pair("iscompressed", vchPubKey.IsCompressed()));
         return obj;
     }

src/script.cpp

@@ -1895,10 +1895,11 @@ bool CScriptCompressor::Decompress(unsigned int nSize, const std::vector<unsigne
         if (!key.SetPubKey(CPubKey(vch)))
             return false;
         key.SetCompressedPubKey(false); // Decompress public key
-        CPubKey pubkey = key.GetPubKey();
+        const CPubKey pubkey = key.GetPubKey();
+        assert(pubkey.size() == 65);
         script.resize(67);
         script[0] = 65;
-        memcpy(&script[1], &pubkey.Raw()[0], 65);
+        memcpy(&script[1], pubkey.begin(), 65);
         script[66] = OP_CHECKSIG;
         return true;
     }

src/script.h

@@ -348,8 +348,10 @@ public:
 
     CScript& operator<<(const CPubKey& key)
     {
-        std::vector<unsigned char> vchKey = key.Raw();
-        return (*this) << vchKey;
+        assert(key.size() < OP_PUSHDATA1);
+        insert(end(), (unsigned char)key.size());
+        insert(end(), key.begin(), key.end());
+        return *this;
     }
 
     CScript& operator<<(const CBigNum& b)

src/util.h

@@ -300,7 +300,8 @@ std::string HexStr(const T itbegin, const T itend, bool fSpaces=false)
     return rv;
 }
 
-inline std::string HexStr(const std::vector<unsigned char>& vch, bool fSpaces=false)
+template<typename T>
+inline std::string HexStr(const T& vch, bool fSpaces=false)
 {
     return HexStr(vch.begin(), vch.end(), fSpaces);
 }