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Add sanity check after key generation

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Add a sanity check to prevent cosmic rays from flipping a bit in the
generated public key, or bugs in the elliptic curve code. This is
simply done by signing a (randomized) message, and verifying the
result.
This commit is contained in:
Pieter Wuille
2014-11-06 01:17:48 -08:00
parent cbf28c6619
commit d0c41a7350
5 changed files with 44 additions and 4 deletions
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19
src/key.cpp
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@@ -86,6 +86,20 @@ bool CKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig) const {
return true;
}
bool CKey::VerifyPubKey(const CPubKey& pubkey) const {
if (pubkey.IsCompressed() != fCompressed) {
return false;
}
unsigned char rnd[8];
std::string str = "Bitcoin key verification\n";
GetRandBytes(rnd, sizeof(rnd));
uint256 hash;
CHash256().Write((unsigned char*)str.data(), str.size()).Write(rnd, sizeof(rnd)).Finalize((unsigned char*)&hash);
std::vector<unsigned char> vchSig;
Sign(hash, vchSig);
return pubkey.Verify(hash, vchSig);
}
bool CKey::SignCompact(const uint256 &hash, std::vector<unsigned char>& vchSig) const {
if (!fValid)
return false;
@@ -111,10 +125,7 @@ bool CKey::Load(CPrivKey &privkey, CPubKey &vchPubKey, bool fSkipCheck=false) {
if (fSkipCheck)
return true;
if (GetPubKey() != vchPubKey)
return false;
return true;
return VerifyPubKey(vchPubKey);
}
bool CKey::Derive(CKey& keyChild, unsigned char ccChild[32], unsigned int nChild, const unsigned char cc[32]) const {