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chaincodes: abstract away more chaincode behavior 

[squashme] replace struct CCainCode with a typedef uint256 ChainCode
0.13
Cory Fields 10 years ago committed by Jonas Schnelli
parent
8cf1485f3b
commit
a574899671
6 changed files with 25 additions and 53 deletions
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  1. 8
      src/hash.cpp
  2. 4
      src/hash.h
  3. 14
      src/key.cpp
  4. 6
      src/key.h
  5. 10
      src/pubkey.cpp
  6. 36
      src/pubkey.h

8
src/hash.cpp
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@ -5,6 +5,7 @@
#include "hash.h" #include "hash.h"
#include "crypto/common.h" #include "crypto/common.h"
#include "crypto/hmac_sha512.h" #include "crypto/hmac_sha512.h"
#include "pubkey.h"
inline uint32_t ROTL32(uint32_t x, int8_t r) 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; 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]; unsigned char num[4];
num[0] = (nChild >> 24) & 0xFF; num[0] = (nChild >> 24) & 0xFF;
num[1] = (nChild >> 16) & 0xFF; num[1] = (nChild >> 16) & 0xFF;
num[2] = (nChild >> 8) & 0xFF; num[2] = (nChild >> 8) & 0xFF;
num[3] = (nChild >> 0) & 0xFF; num[3] = (nChild >> 0) & 0xFF;
CHMAC_SHA512(chainCode, 32).Write(&header, 1) CHMAC_SHA512(chainCode.begin(), chainCode.size()).Write(&header, 1).Write(data, 32).Write(num, 4).Finalize(output);
.Write(data, 32)
.Write(num, 4)
.Finalize(output);
} }

4
src/hash.h
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@ -14,6 +14,8 @@
#include <vector> #include <vector>
typedef uint256 ChainCode;
/** A hasher class for Bitcoin's 256-bit hash (double SHA-256). */ /** A hasher class for Bitcoin's 256-bit hash (double SHA-256). */
class CHash256 { class CHash256 {
private: 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); 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 #endif // BITCOIN_HASH_H

14
src/key.cpp
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@ -125,7 +125,7 @@ bool CKey::Load(CPrivKey &privkey, CPubKey &vchPubKey, bool fSkipCheck=false) {
return VerifyPubKey(vchPubKey); 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(IsValid());
assert(IsCompressed()); assert(IsCompressed());
unsigned char out[64]; unsigned char out[64];
@ -138,7 +138,7 @@ bool CKey::Derive(CKey& keyChild, unsigned char ccChild[32], unsigned int nChild
assert(begin() + 32 == end()); assert(begin() + 32 == end());
BIP32Hash(cc, nChild, 0, begin(), out); BIP32Hash(cc, nChild, 0, begin(), out);
} }
memcpy(ccChild, out+32, 32); memcpy(ccChild.begin(), out+32, 32);
memcpy((unsigned char*)keyChild.begin(), begin(), 32); memcpy((unsigned char*)keyChild.begin(), begin(), 32);
bool ret = secp256k1_ec_privkey_tweak_add((unsigned char*)keyChild.begin(), out); bool ret = secp256k1_ec_privkey_tweak_add((unsigned char*)keyChild.begin(), out);
UnlockObject(out); UnlockObject(out);
@ -152,7 +152,7 @@ bool CExtKey::Derive(CExtKey &out, unsigned int nChild) const {
CKeyID id = key.GetPubKey().GetID(); CKeyID id = key.GetPubKey().GetID();
memcpy(&out.vchFingerprint[0], &id, 4); memcpy(&out.vchFingerprint[0], &id, 4);
out.nChild = nChild; 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) { 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); LockObject(out);
CHMAC_SHA512(hashkey, sizeof(hashkey)).Write(seed, nSeedLen).Finalize(out); CHMAC_SHA512(hashkey, sizeof(hashkey)).Write(seed, nSeedLen).Finalize(out);
key.Set(&out[0], &out[32], true); key.Set(&out[0], &out[32], true);
memcpy(chaincode.data, &out[32], 32); memcpy(chaincode.begin(), &out[32], 32);
UnlockObject(out); UnlockObject(out);
nDepth = 0; nDepth = 0;
nChild = 0; nChild = 0;
@ -174,7 +174,7 @@ CExtPubKey CExtKey::Neuter() const {
memcpy(&ret.vchFingerprint[0], &vchFingerprint[0], 4); memcpy(&ret.vchFingerprint[0], &vchFingerprint[0], 4);
ret.nChild = nChild; ret.nChild = nChild;
ret.pubkey = key.GetPubKey(); ret.pubkey = key.GetPubKey();
memcpy(&ret.chaincode.data[0], &chaincode.data[0], 32); ret.chaincode = chaincode;
return ret; return ret;
} }
@ -183,7 +183,7 @@ void CExtKey::Encode(unsigned char code[74]) const {
memcpy(code+1, vchFingerprint, 4); memcpy(code+1, vchFingerprint, 4);
code[5] = (nChild >> 24) & 0xFF; code[6] = (nChild >> 16) & 0xFF; code[5] = (nChild >> 24) & 0xFF; code[6] = (nChild >> 16) & 0xFF;
code[7] = (nChild >> 8) & 0xFF; code[8] = (nChild >> 0) & 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; code[41] = 0;
assert(key.size() == 32); assert(key.size() == 32);
memcpy(code+42, key.begin(), 32); memcpy(code+42, key.begin(), 32);
@ -193,7 +193,7 @@ void CExtKey::Decode(const unsigned char code[74]) {
nDepth = code[0]; nDepth = code[0];
memcpy(vchFingerprint, code+1, 4); memcpy(vchFingerprint, code+1, 4);
nChild = (code[5] << 24) | (code[6] << 16) | (code[7] << 8) | code[8]; 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); key.Set(code+42, code+74, true);
} }

6
src/key.h
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@ -136,7 +136,7 @@ public:
bool SignCompact(const uint256& hash, std::vector<unsigned char>& vchSig) const; bool SignCompact(const uint256& hash, std::vector<unsigned char>& vchSig) const;
//! Derive BIP32 child key. //! 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. * Verify thoroughly whether a private key and a public key match.
@ -155,13 +155,13 @@ struct CExtKey {
unsigned char nDepth; unsigned char nDepth;
unsigned char vchFingerprint[4]; unsigned char vchFingerprint[4];
unsigned int nChild; unsigned int nChild;
CChainCode chaincode; ChainCode chaincode;
CKey key; CKey key;
friend bool operator==(const CExtKey& a, const CExtKey& b) 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 && 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; void Encode(unsigned char code[74]) const;

10
src/pubkey.cpp
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@ -54,13 +54,13 @@ bool CPubKey::Decompress() {
return true; 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(IsValid());
assert((nChild >> 31) == 0); assert((nChild >> 31) == 0);
assert(begin() + 33 == end()); assert(begin() + 33 == end());
unsigned char out[64]; unsigned char out[64];
BIP32Hash(cc, nChild, *begin(), begin()+1, out); BIP32Hash(cc, nChild, *begin(), begin()+1, out);
memcpy(ccChild, out+32, 32); memcpy(ccChild.begin(), out+32, 32);
CECKey key; CECKey key;
bool ret = key.SetPubKey(begin(), size()); bool ret = key.SetPubKey(begin(), size());
ret &= key.TweakPublic(out); ret &= key.TweakPublic(out);
@ -75,7 +75,7 @@ void CExtPubKey::Encode(unsigned char code[74]) const {
memcpy(code+1, vchFingerprint, 4); memcpy(code+1, vchFingerprint, 4);
code[5] = (nChild >> 24) & 0xFF; code[6] = (nChild >> 16) & 0xFF; code[5] = (nChild >> 24) & 0xFF; code[6] = (nChild >> 16) & 0xFF;
code[7] = (nChild >> 8) & 0xFF; code[8] = (nChild >> 0) & 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); assert(pubkey.size() == 33);
memcpy(code+41, pubkey.begin(), 33); memcpy(code+41, pubkey.begin(), 33);
} }
@ -84,7 +84,7 @@ void CExtPubKey::Decode(const unsigned char code[74]) {
nDepth = code[0]; nDepth = code[0];
memcpy(vchFingerprint, code+1, 4); memcpy(vchFingerprint, code+1, 4);
nChild = (code[5] << 24) | (code[6] << 16) | (code[7] << 8) | code[8]; 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); pubkey.Set(code+41, code+74);
} }
@ -93,5 +93,5 @@ bool CExtPubKey::Derive(CExtPubKey &out, unsigned int nChild) const {
CKeyID id = pubkey.GetID(); CKeyID id = pubkey.GetID();
memcpy(&out.vchFingerprint[0], &id, 4); memcpy(&out.vchFingerprint[0], &id, 4);
out.nChild = nChild; 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
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@ -31,35 +31,7 @@ public:
CKeyID(const uint160& in) : uint160(in) {} CKeyID(const uint160& in) : uint160(in) {}
}; };
struct CChainCode typedef uint256 ChainCode;
{
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));
}
};
/** An encapsulated public key. */ /** An encapsulated public key. */
class CPubKey class CPubKey
@ -212,20 +184,20 @@ public:
bool Decompress(); bool Decompress();
//! Derive BIP32 child pubkey. //! 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 { struct CExtPubKey {
unsigned char nDepth; unsigned char nDepth;
unsigned char vchFingerprint[4]; unsigned char vchFingerprint[4];
unsigned int nChild; unsigned int nChild;
CChainCode chaincode; ChainCode chaincode;
CPubKey pubkey; CPubKey pubkey;
friend bool operator==(const CExtPubKey &a, const CExtPubKey &b) 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 && 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; void Encode(unsigned char code[74]) const;

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