bool CECKey::SignCompact(const uint256 &hash, unsigned char *p64, int &rec) {
bool fOk = false;
ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
if (sig==NULL)
return false;
memset(p64, 0, 64);
int nBitsR = BN_num_bits(sig->r);
int nBitsS = BN_num_bits(sig->s);
if (nBitsR <= 256 && nBitsS <= 256) {
std::vector<unsigned char> pubkey;
GetPubKey(pubkey, true);
for (int i=0; i<4; i++) {
CECKey keyRec;
if (ECDSA_SIG_recover_key_GFp(keyRec.pkey, sig, (unsigned char*)&hash, sizeof(hash), i, 1) == 1) {
std::vector<unsigned char> pubkeyRec;
keyRec.GetPubKey(pubkeyRec, true);
if (pubkeyRec == pubkey) {
rec = i;
fOk = true;
break;
}
}
}
assert(fOk);
BN_bn2bin(sig->r,&p64[32-(nBitsR+7)/8]);
BN_bn2bin(sig->s,&p64[64-(nBitsS+7)/8]);
}
ECDSA_SIG_free(sig);
return fOk;
}
bool CKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig) const {
if (!fValid)
return false;
CECKey key;
key.SetSecretBytes(vch);
return key.Sign(hash, vchSig);
}
bool CPubKey::IsFullyValid() const {
if (!IsValid())
return false;
CECKey key;
if (!key.SetPubKey(*this))
return false;
return true;
}
CPubKey CKey::GetPubKey() const {
assert(fValid);
CECKey key;
key.SetSecretBytes(vch);
CPubKey pubkey;
key.GetPubKey(pubkey, fCompressed);
return pubkey;
}
CPrivKey CKey::GetPrivKey() const {
assert(fValid);
CECKey key;
key.SetSecretBytes(vch);
CPrivKey privkey;
key.GetPrivKey(privkey, fCompressed);
return privkey;
}
bool CKey::Decrypt(ecies_secure_t const &cryptex, std::string &vchText )
{
if (!fValid)
return false;
CECKey key;
key.SetSecretBytes(vch);
return key.Decrypt(cryptex, vchText);
}
bool CPubKey::Decompress() {
if (!IsValid())
return false;
CECKey key;
if (!key.SetPubKey(*this))
return false;
key.GetPubKey(*this, false);
return true;
}
bool CPubKey::RecoverCompact(const uint256 &hash, const std::vector<unsigned char>& vchSig) {
if (vchSig.size() != 65)
return false;
CECKey key;
if (!key.Recover(hash, &vchSig[1], (vchSig[0] - 27) & ~4))
return false;
key.GetPubKey(*this, (vchSig[0] - 27) & 4);
return true;
}
bool CKey::SetPrivKey(const CPrivKey &privkey, bool fCompressedIn) {
CECKey key;
if (!key.SetPrivKey(privkey))
return false;
key.GetSecretBytes(vch);
fCompressed = fCompressedIn;
fValid = true;
return true;
}
bool CPubKey::Encrypt(std::string const &vchText, ecies_secure_t &cryptex)
{
if (!IsValid())
return false;
CECKey key;
if (!key.SetPubKey(*this))
return false;
return key.Encrypt(vchText, cryptex);
}
bool CPubKey::Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) const {
if (!IsValid())
return false;
CECKey key;
if (!key.SetPubKey(*this))
return false;
if (!key.Verify(hash, vchSig))
return false;
return true;
}
bool CKey::SignCompact(const uint256 &hash, std::vector<unsigned char>& vchSig) const {
if (!fValid)
return false;
CECKey key;
key.SetSecretBytes(vch);
vchSig.resize(65);
int rec = -1;
if (!key.SignCompact(hash, &vchSig[1], rec))
return false;
assert(rec != -1);
vchSig[0] = 27 + rec + (fCompressed ? 4 : 0);
return true;
}
bool CPubKey::VerifyCompact(const uint256 &hash, const std::vector<unsigned char>& vchSig) const {
if (!IsValid())
return false;
if (vchSig.size() != 65)
return false;
CECKey key;
if (!key.Recover(hash, &vchSig[1], (vchSig[0] - 27) & ~4))
return false;
CPubKey pubkeyRec;
key.GetPubKey(pubkeyRec, IsCompressed());
if (*this != pubkeyRec)
return false;
return true;
}
