Merge pull request #6034

a574899 chaincodes: abstract away more chaincode behavior [squashme] replace struct CCainCode with a typedef uint256 ChainCode (Cory Fields)
8cf1485 Abstract chaincodes into CChainCode (Pieter Wuille)

src/key.h

@@ -6,6 +6,7 @@
 #ifndef BITCOIN_KEY_H
 #define BITCOIN_KEY_H
 
+#include "pubkey.h"
 #include "serialize.h"
 #include "support/allocators/secure.h"
 #include "uint256.h"
@@ -13,9 +14,6 @@
 #include <stdexcept>
 #include <vector>
 
-class CPubKey;
-
-struct CExtPubKey;
 
 /** 
  * secp256k1:
@@ -138,7 +136,7 @@ public:
     bool SignCompact(const uint256& hash, std::vector<unsigned char>& vchSig) const;
 
     //! Derive BIP32 child key.
-    bool Derive(CKey& keyChild, unsigned char ccChild[32], unsigned int nChild, const unsigned char cc[32]) const;
+    bool Derive(CKey& keyChild, ChainCode &ccChild, unsigned int nChild, const ChainCode& cc) const;
 
     /**
      * Verify thoroughly whether a private key and a public key match.
@@ -157,13 +155,13 @@ struct CExtKey {
     unsigned char nDepth;
     unsigned char vchFingerprint[4];
     unsigned int nChild;
-    unsigned char vchChainCode[32];
+    ChainCode chaincode;
     CKey key;
 
     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 &&
-               memcmp(&a.vchChainCode[0], &b.vchChainCode[0], 32) == 0 && a.key == b.key;
+               a.chaincode == b.chaincode && a.key == b.key;
     }
 
     void Encode(unsigned char code[74]) const;