lbrycrd/src/key.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2013 The Bitcoin developers
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// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_KEY_H
#define BITCOIN_KEY_H
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#include "allocators.h"
#include "hash.h"
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#include "serialize.h"
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#include "uint256.h"
#include <stdexcept>
#include <vector>
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// secp256k1:
// const unsigned int PRIVATE_KEY_SIZE = 279;
// const unsigned int PUBLIC_KEY_SIZE = 65;
// const unsigned int SIGNATURE_SIZE = 72;
//
// see www.keylength.com
// script supports up to 75 for single byte push
/** A reference to a CKey: the Hash160 of its serialized public key */
class CKeyID : public uint160
{
public:
CKeyID() : uint160(0) { }
CKeyID(const uint160 &in) : uint160(in) { }
};
/** A reference to a CScript: the Hash160 of its serialization (see script.h) */
class CScriptID : public uint160
{
public:
CScriptID() : uint160(0) { }
CScriptID(const uint160 &in) : uint160(in) { }
};
/** An encapsulated public key. */
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class CPubKey {
private:
// Just store the serialized data.
// Its length can very cheaply be computed from the first byte.
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unsigned char vch[65];
// Compute the length of a pubkey with a given first byte.
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unsigned int static GetLen(unsigned char chHeader) {
if (chHeader == 2 || chHeader == 3)
return 33;
if (chHeader == 4 || chHeader == 6 || chHeader == 7)
return 65;
return 0;
}
// Set this key data to be invalid
void Invalidate() {
vch[0] = 0xFF;
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}
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public:
// Construct an invalid public key.
CPubKey() {
Invalidate();
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}
// Initialize a public key using begin/end iterators to byte data.
template<typename T>
void Set(const T pbegin, const T pend) {
int len = pend == pbegin ? 0 : GetLen(pbegin[0]);
if (len && len == (pend-pbegin))
memcpy(vch, (unsigned char*)&pbegin[0], len);
else
Invalidate();
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}
// Construct a public key using begin/end iterators to byte data.
template<typename T>
CPubKey(const T pbegin, const T pend) {
Set(pbegin, pend);
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}
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// Construct a public key from a byte vector.
CPubKey(const std::vector<unsigned char> &vch) {
Set(vch.begin(), vch.end());
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}
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// Simple read-only vector-like interface to the pubkey data.
unsigned int size() const { return GetLen(vch[0]); }
const unsigned char *begin() const { return vch; }
const unsigned char *end() const { return vch+size(); }
const unsigned char &operator[](unsigned int pos) const { return vch[pos]; }
// Comparator implementation.
friend bool operator==(const CPubKey &a, const CPubKey &b) {
return a.vch[0] == b.vch[0] &&
memcmp(a.vch, b.vch, a.size()) == 0;
}
friend bool operator!=(const CPubKey &a, const CPubKey &b) {
return !(a == b);
}
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friend bool operator<(const CPubKey &a, const CPubKey &b) {
return a.vch[0] < b.vch[0] ||
(a.vch[0] == b.vch[0] && memcmp(a.vch, b.vch, a.size()) < 0);
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}
// Implement serialization, as if this was a byte vector.
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unsigned int GetSerializeSize(int nType, int nVersion) const {
return size() + 1;
}
template<typename Stream> void Serialize(Stream &s, int nType, int nVersion) const {
unsigned int len = size();
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::WriteCompactSize(s, len);
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s.write((char*)vch, len);
}
template<typename Stream> void Unserialize(Stream &s, int nType, int nVersion) {
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unsigned int len = ::ReadCompactSize(s);
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if (len <= 65) {
s.read((char*)vch, len);
} else {
// invalid pubkey, skip available data
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char dummy;
while (len--)
s.read(&dummy, 1);
Invalidate();
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}
}
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// Get the KeyID of this public key (hash of its serialization)
CKeyID GetID() const {
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return CKeyID(Hash160(vch, vch+size()));
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}
// Get the 256-bit hash of this public key.
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uint256 GetHash() const {
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return Hash(vch, vch+size());
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}
// Check syntactic correctness.
//
// Note that this is consensus critical as CheckSig() calls it!
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bool IsValid() const {
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return size() > 0;
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}
// fully validate whether this is a valid public key (more expensive than IsValid())
bool IsFullyValid() const;
// Check whether this is a compressed public key.
bool IsCompressed() const {
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return size() == 33;
}
// Verify a DER signature (~72 bytes).
// If this public key is not fully valid, the return value will be false.
bool Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) const;
// Recover a public key from a compact signature.
bool RecoverCompact(const uint256 &hash, const std::vector<unsigned char>& vchSig);
// Turn this public key into an uncompressed public key.
bool Decompress();
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// Derive BIP32 child pubkey.
bool Derive(CPubKey& pubkeyChild, unsigned char ccChild[32], unsigned int nChild, const unsigned char cc[32]) const;
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};
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// secure_allocator is defined in allocators.h
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// CPrivKey is a serialized private key, with all parameters included (279 bytes)
typedef std::vector<unsigned char, secure_allocator<unsigned char> > CPrivKey;
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/** An encapsulated private key. */
class CKey {
private:
// Whether this private key is valid. We check for correctness when modifying the key
// data, so fValid should always correspond to the actual state.
bool fValid;
// Whether the public key corresponding to this private key is (to be) compressed.
bool fCompressed;
// The actual byte data
unsigned char vch[32];
// Check whether the 32-byte array pointed to be vch is valid keydata.
bool static Check(const unsigned char *vch);
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public:
// Construct an invalid private key.
CKey() : fValid(false) {
LockObject(vch);
}
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// Copy constructor. This is necessary because of memlocking.
CKey(const CKey &secret) : fValid(secret.fValid), fCompressed(secret.fCompressed) {
LockObject(vch);
memcpy(vch, secret.vch, sizeof(vch));
}
// Destructor (again necessary because of memlocking).
~CKey() {
UnlockObject(vch);
}
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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;
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}
// 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) {
fValid = false;
return;
}
if (Check(&pbegin[0])) {
memcpy(vch, (unsigned char*)&pbegin[0], 32);
fValid = true;
fCompressed = fCompressedIn;
} else {
fValid = false;
}
}
// Simple read-only vector-like interface.
unsigned int size() const { return (fValid ? 32 : 0); }
const unsigned char *begin() const { return vch; }
const unsigned char *end() const { return vch + size(); }
// Check whether this private key is valid.
bool IsValid() const { return fValid; }
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// Check whether the public key corresponding to this private key is (to be) compressed.
bool IsCompressed() const { return fCompressed; }
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// Initialize from a CPrivKey (serialized OpenSSL private key data).
bool SetPrivKey(const CPrivKey &vchPrivKey, bool fCompressed);
// Generate a new private key using a cryptographic PRNG.
void MakeNewKey(bool fCompressed);
// Convert the private key to a CPrivKey (serialized OpenSSL private key data).
// This is expensive.
CPrivKey GetPrivKey() const;
// Compute the public key from a private key.
// This is expensive.
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CPubKey GetPubKey() const;
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// Create a DER-serialized signature.
bool Sign(const uint256 &hash, std::vector<unsigned char>& vchSig) const;
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// Create a compact signature (65 bytes), which allows reconstructing the used public key.
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// The format is one header byte, followed by two times 32 bytes for the serialized r and s values.
// The header byte: 0x1B = first key with even y, 0x1C = first key with odd y,
// 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;
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// Derive BIP32 child key.
bool Derive(CKey& keyChild, unsigned char ccChild[32], unsigned int nChild, const unsigned char cc[32]) const;
// Load private key and check that public key matches.
bool Load(CPrivKey &privkey, CPubKey &vchPubKey, bool fSkipCheck);
// Check whether an element of a signature (r or s) is valid.
static bool CheckSignatureElement(const unsigned char *vch, int len, bool half);
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};
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);
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};
/** Check that required EC support is available at runtime */
bool ECC_InitSanityCheck(void);
#endif