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chaincodes: abstract away more chaincode behavior

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[squashme] replace struct CCainCode with a typedef uint256 ChainCode
This commit is contained in:
Cory Fields 2015-04-21 18:09:37 -04:00 committed by Jonas Schnelli
parent 8cf1485f3b
commit a574899671
6 changed files with 25 additions and 53 deletions
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8
src/hash.cpp
View file

@ -5,6 +5,7 @@
#include "hash.h"
#include "crypto/common.h"
#include "crypto/hmac_sha512.h"
#include "pubkey.h"
inline uint32_t ROTL32(uint32_t x, int8_t r)
@ -71,15 +72,12 @@ unsigned int MurmurHash3(unsigned int nHashSeed, const std::vector<unsigned char
return h1;
}
void BIP32Hash(const unsigned char chainCode[32], unsigned int nChild, unsigned char header, const unsigned char data[32], unsigned char output[64])
void BIP32Hash(const ChainCode &chainCode, unsigned int nChild, unsigned char header, const unsigned char data[32], unsigned char output[64])
{
unsigned char num[4];
num[0] = (nChild >> 24) & 0xFF;
num[1] = (nChild >> 16) & 0xFF;
num[2] = (nChild >> 8) & 0xFF;
num[3] = (nChild >> 0) & 0xFF;
CHMAC_SHA512(chainCode, 32).Write(&header, 1)
.Write(data, 32)
.Write(num, 4)
.Finalize(output);
CHMAC_SHA512(chainCode.begin(), chainCode.size()).Write(&header, 1).Write(data, 32).Write(num, 4).Finalize(output);
}

4
src/hash.h
View file

@ -14,6 +14,8 @@
#include <vector>
typedef uint256 ChainCode;
/** A hasher class for Bitcoin's 256-bit hash (double SHA-256). */
class CHash256 {
private:
@ -159,6 +161,6 @@ uint256 SerializeHash(const T& obj, int nType=SER_GETHASH, int nVersion=PROTOCOL
unsigned int MurmurHash3(unsigned int nHashSeed, const std::vector<unsigned char>& vDataToHash);
void BIP32Hash(const unsigned char chainCode[32], unsigned int nChild, unsigned char header, const unsigned char data[32], unsigned char output[64]);
void BIP32Hash(const ChainCode &chainCode, unsigned int nChild, unsigned char header, const unsigned char data[32], unsigned char output[64]);
#endif // BITCOIN_HASH_H

14
src/key.cpp
View file

@ -125,7 +125,7 @@ bool CKey::Load(CPrivKey &privkey, CPubKey &vchPubKey, bool fSkipCheck=false) {
return VerifyPubKey(vchPubKey);
}
bool CKey::Derive(CKey& keyChild, unsigned char ccChild[32], unsigned int nChild, const unsigned char cc[32]) const {
bool CKey::Derive(CKey& keyChild, ChainCode &ccChild, unsigned int nChild, const ChainCode& cc) const {
assert(IsValid());
assert(IsCompressed());
unsigned char out[64];
@ -138,7 +138,7 @@ bool CKey::Derive(CKey& keyChild, unsigned char ccChild[32], unsigned int nChild
assert(begin() + 32 == end());
BIP32Hash(cc, nChild, 0, begin(), out);
}
memcpy(ccChild, out+32, 32);
memcpy(ccChild.begin(), out+32, 32);
memcpy((unsigned char*)keyChild.begin(), begin(), 32);
bool ret = secp256k1_ec_privkey_tweak_add((unsigned char*)keyChild.begin(), out);
UnlockObject(out);
@ -152,7 +152,7 @@ bool CExtKey::Derive(CExtKey &out, unsigned int nChild) const {
CKeyID id = key.GetPubKey().GetID();
memcpy(&out.vchFingerprint[0], &id, 4);
out.nChild = nChild;
return key.Derive(out.key, out.chaincode.data, nChild, chaincode.data);
return key.Derive(out.key, out.chaincode, nChild, chaincode);
}
void CExtKey::SetMaster(const unsigned char *seed, unsigned int nSeedLen) {
@ -161,7 +161,7 @@ void CExtKey::SetMaster(const unsigned char *seed, unsigned int nSeedLen) {
LockObject(out);
CHMAC_SHA512(hashkey, sizeof(hashkey)).Write(seed, nSeedLen).Finalize(out);
key.Set(&out[0], &out[32], true);
memcpy(chaincode.data, &out[32], 32);
memcpy(chaincode.begin(), &out[32], 32);
UnlockObject(out);
nDepth = 0;
nChild = 0;
@ -174,7 +174,7 @@ CExtPubKey CExtKey::Neuter() const {
memcpy(&ret.vchFingerprint[0], &vchFingerprint[0], 4);
ret.nChild = nChild;
ret.pubkey = key.GetPubKey();
memcpy(&ret.chaincode.data[0], &chaincode.data[0], 32);
ret.chaincode = chaincode;
return ret;
}
@ -183,7 +183,7 @@ void CExtKey::Encode(unsigned char code[74]) const {
memcpy(code+1, vchFingerprint, 4);
code[5] = (nChild >> 24) & 0xFF; code[6] = (nChild >> 16) & 0xFF;
code[7] = (nChild >> 8) & 0xFF; code[8] = (nChild >> 0) & 0xFF;
memcpy(code+9, chaincode.data, 32);
memcpy(code+9, chaincode.begin(), 32);
code[41] = 0;
assert(key.size() == 32);
memcpy(code+42, key.begin(), 32);
@ -193,7 +193,7 @@ void CExtKey::Decode(const unsigned char code[74]) {
nDepth = code[0];
memcpy(vchFingerprint, code+1, 4);
nChild = (code[5] << 24) | (code[6] << 16) | (code[7] << 8) | code[8];
memcpy(chaincode.data, code+9, 32);
memcpy(chaincode.begin(), code+9, 32);
key.Set(code+42, code+74, true);
}

6
src/key.h
View file

@ -136,7 +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.
@ -155,13 +155,13 @@ struct CExtKey {
unsigned char nDepth;
unsigned char vchFingerprint[4];
unsigned int nChild;
CChainCode chaincode;
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.chaincode.data[0], &b.chaincode.data[0], 32) == 0 && a.key == b.key;
a.chaincode == b.chaincode && a.key == b.key;
}
void Encode(unsigned char code[74]) const;

10
src/pubkey.cpp
View file

@ -54,13 +54,13 @@ bool CPubKey::Decompress() {
return true;
}
bool CPubKey::Derive(CPubKey& pubkeyChild, unsigned char ccChild[32], unsigned int nChild, const unsigned char cc[32]) const {
bool CPubKey::Derive(CPubKey& pubkeyChild, ChainCode &ccChild, unsigned int nChild, const ChainCode& cc) const {
assert(IsValid());
assert((nChild >> 31) == 0);
assert(begin() + 33 == end());
unsigned char out[64];
BIP32Hash(cc, nChild, *begin(), begin()+1, out);
memcpy(ccChild, out+32, 32);
memcpy(ccChild.begin(), out+32, 32);
CECKey key;
bool ret = key.SetPubKey(begin(), size());
ret &= key.TweakPublic(out);
@ -75,7 +75,7 @@ void CExtPubKey::Encode(unsigned char code[74]) const {
memcpy(code+1, vchFingerprint, 4);
code[5] = (nChild >> 24) & 0xFF; code[6] = (nChild >> 16) & 0xFF;
code[7] = (nChild >> 8) & 0xFF; code[8] = (nChild >> 0) & 0xFF;
memcpy(code+9, chaincode.data, 32);
memcpy(code+9, chaincode.begin(), 32);
assert(pubkey.size() == 33);
memcpy(code+41, pubkey.begin(), 33);
}
@ -84,7 +84,7 @@ void CExtPubKey::Decode(const unsigned char code[74]) {
nDepth = code[0];
memcpy(vchFingerprint, code+1, 4);
nChild = (code[5] << 24) | (code[6] << 16) | (code[7] << 8) | code[8];
memcpy(chaincode.data, code+9, 32);
memcpy(chaincode.begin(), code+9, 32);
pubkey.Set(code+41, code+74);
}
@ -93,5 +93,5 @@ bool CExtPubKey::Derive(CExtPubKey &out, unsigned int nChild) const {
CKeyID id = pubkey.GetID();
memcpy(&out.vchFingerprint[0], &id, 4);
out.nChild = nChild;
return pubkey.Derive(out.pubkey, out.chaincode.data, nChild, chaincode.data);
return pubkey.Derive(out.pubkey, out.chaincode, nChild, chaincode);
}

36
src/pubkey.h
View file

@ -31,35 +31,7 @@ public:
CKeyID(const uint160& in) : uint160(in) {}
};
struct CChainCode
{
unsigned char data[32];
void SetNull()
{
memset(data, 0, sizeof(data));
}
CChainCode()
{
SetNull();
}
bool IsNull() const
{
for (int i=0; i<32; i++)
if (data[i])
return false;
return true;
}
ADD_SERIALIZE_METHODS;
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
READWRITE(FLATDATA(data));
}
};
typedef uint256 ChainCode;
/** An encapsulated public key. */
class CPubKey
@ -212,20 +184,20 @@ public:
bool Decompress();
//! Derive BIP32 child pubkey.
bool Derive(CPubKey& pubkeyChild, unsigned char ccChild[32], unsigned int nChild, const unsigned char cc[32]) const;
bool Derive(CPubKey& pubkeyChild, ChainCode &ccChild, unsigned int nChild, const ChainCode& cc) const;
};
struct CExtPubKey {
unsigned char nDepth;
unsigned char vchFingerprint[4];
unsigned int nChild;
CChainCode chaincode;
ChainCode chaincode;
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.chaincode.data[0], &b.chaincode.data[0], 32) == 0 && a.pubkey == b.pubkey;
a.chaincode == b.chaincode && a.pubkey == b.pubkey;
}
void Encode(unsigned char code[74]) const;