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BIP32 derivation implementation

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This commit is contained in:
Pieter Wuille
2013-07-15 01:05:25 +02:00
parent 8388289eb6
commit eb2c999050
5 changed files with 258 additions and 0 deletions
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46
src/key.h
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@@ -161,6 +161,9 @@ public:
// Turn this public key into an uncompressed public key.
bool Decompress();
// Derive BIP32 child pubkey.
bool Derive(CPubKey& pubkeyChild, unsigned char ccChild[32], unsigned int nChild, const unsigned char cc[32]) const;
};
@@ -201,6 +204,10 @@ public:
UnlockObject(vch);
}
friend bool operator==(const CKey &a, const CKey &b) {
return a.fCompressed == b.fCompressed && memcmp(&a.vch[0], &b.vch[0], 32);
}
// Initialize using begin and end iterators to byte data.
template<typename T>
void Set(const T pbegin, const T pend, bool fCompressedIn) {
@@ -251,6 +258,45 @@ public:
// 0x1D = second key with even y, 0x1E = second key with odd y,
// add 0x04 for compressed keys.
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;
};
struct CExtPubKey {
unsigned char nDepth;
unsigned char vchFingerprint[4];
unsigned int nChild;
unsigned char vchChainCode[32];
CPubKey pubkey;
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 &&
memcmp(&a.vchChainCode[0], &b.vchChainCode[0], 32) == 0 && a.pubkey == b.pubkey;
}
void Encode(unsigned char code[74]) const;
void Decode(const unsigned char code[74]);
bool Derive(CExtPubKey &out, unsigned int nChild) const;
};
struct CExtKey {
unsigned char nDepth;
unsigned char vchFingerprint[4];
unsigned int nChild;
unsigned char vchChainCode[32];
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;
}
void Encode(unsigned char code[74]) const;
void Decode(const unsigned char code[74]);
bool Derive(CExtKey &out, unsigned int nChild) const;
CExtPubKey Neuter() const;
void SetMaster(const unsigned char *seed, unsigned int nSeedLen);
};
#endif