message: Check input parameters btc_ecrecover
diff: @@ -6,6 +6,13 @@ using namespace dev;
  bool qtumutils::btc_ecrecover(const dev::h256 &hash, const dev::u256 &v, const dev::h256 &r, const dev::h256 &s, dev::h256 &key)
  {
  + // Check input parameters
  + if(v >= 256)
  + {
  + // Does not fit into 1 byte
  + return false;
  + }
  +
  // Convert the data into format usable for btc
  CPubKey pubKey;
  std::vector<unsigned char> vchSig;
  