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Code fix #7

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Code fix #7

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23 changes: 22 additions & 1 deletion src/key.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -354,8 +354,29 @@ bool CKey::SetCompactSignature(uint256 hash, const std::vector<unsigned char>& v
return false;
}

bool CKey::Verify(uint256 hash, const std::vector<unsigned char>& vchSig)
bool CKey::Verify(uint256 hash, const std::vector<unsigned char>& vchSigParam)
{
// Prevent the problem described here: https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-July/009697.html
// by removing the extra length bytes
std::vector<unsigned char> vchSig(vchSigParam.begin(), vchSigParam.end());
if (vchSig.size() > 1 && vchSig[1] & 0x80)
{
unsigned char nLengthBytes = vchSig[1] & 0x7f;

if (vchSig.size() < 2 + nLengthBytes)
return false;

if (nLengthBytes > 4)
{
unsigned char nExtraBytes = nLengthBytes - 4;
for (unsigned char i = 0; i < nExtraBytes; i++)
if (vchSig[2 + i])
return false;
vchSig.erase(vchSig.begin() + 2, vchSig.begin() + 2 + nExtraBytes);
vchSig[1] = 0x80 | (nLengthBytes - nExtraBytes);
}
}

if (vchSig.empty())
return false;

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