[trivial] Switched constants to sizeof()

src/key.h

@@ -45,6 +45,8 @@ private:
     //! The actual byte data
     unsigned char vch[32];
 
+    static_assert(sizeof(vch) == 32, "vch must be 32 bytes in length to not break serialization");
+
     //! Check whether the 32-byte array pointed to be vch is valid keydata.
     bool static Check(const unsigned char* vch);
 
@@ -70,20 +72,19 @@ public:
 
     friend bool operator==(const CKey& a, const CKey& b)
     {
-        return a.fCompressed == b.fCompressed && a.size() == b.size() &&
-               memcmp(&a.vch[0], &b.vch[0], a.size()) == 0;
+        return a.fCompressed == b.fCompressed &&
+            a.size() == b.size() &&
+            memcmp(&a.vch[0], &b.vch[0], a.size()) == 0;
     }
 
     //! Initialize using begin and end iterators to byte data.
     template <typename T>
     void Set(const T pbegin, const T pend, bool fCompressedIn)
     {
-        if (pend - pbegin != 32) {
+        if (pend - pbegin != sizeof(vch)) {
             fValid = false;
-            return;
-        }
-        if (Check(&pbegin[0])) {
-            memcpy(vch, (unsigned char*)&pbegin[0], 32);
+        } else if (Check(&pbegin[0])) {
+            memcpy(vch, (unsigned char*)&pbegin[0], sizeof(vch));
             fValid = true;
             fCompressed = fCompressedIn;
         } else {
@@ -92,7 +93,7 @@ public:
     }
 
     //! Simple read-only vector-like interface.
-    unsigned int size() const { return (fValid ? 32 : 0); }
+    unsigned int size() const { return (fValid ? sizeof(vch) : 0); }
     const unsigned char* begin() const { return vch; }
     const unsigned char* end() const { return vch + size(); }
 
@@ -160,8 +161,11 @@ struct CExtKey {
 
     friend bool operator==(const CExtKey& a, const CExtKey& b)
     {
-        return a.nDepth == b.nDepth && memcmp(&a.vchFingerprint[0], &b.vchFingerprint[0], 4) == 0 && a.nChild == b.nChild &&
-               a.chaincode == b.chaincode && a.key == b.key;
+        return a.nDepth == b.nDepth &&
+            memcmp(&a.vchFingerprint[0], &b.vchFingerprint[0], sizeof(vchFingerprint)) == 0 &&
+            a.nChild == b.nChild &&
+            a.chaincode == b.chaincode &&
+            a.key == b.key;
     }
 
     void Encode(unsigned char code[BIP32_EXTKEY_SIZE]) const;

src/pubkey.h

@@ -203,8 +203,11 @@ struct CExtPubKey {
 
     friend bool operator==(const CExtPubKey &a, const CExtPubKey &b)
     {
-        return a.nDepth == b.nDepth && memcmp(&a.vchFingerprint[0], &b.vchFingerprint[0], 4) == 0 && a.nChild == b.nChild &&
-               a.chaincode == b.chaincode && a.pubkey == b.pubkey;
+        return a.nDepth == b.nDepth &&
+            memcmp(&a.vchFingerprint[0], &b.vchFingerprint[0], sizeof(vchFingerprint)) == 0 &&
+            a.nChild == b.nChild &&
+            a.chaincode == b.chaincode &&
+            a.pubkey == b.pubkey;
     }
 
     void Encode(unsigned char code[BIP32_EXTKEY_SIZE]) const;