Method GetBit

secp256k1/Int.cpp:1058–1063

int Int::GetBit(uint32_t n) {
  uint32_t byte = n>>5;
  uint32_t bit  = n&31;
  uint32_t mask = 1 << bit;
  return (bits[byte] & mask)!=0;
}

// ------------------------------------------------
char* Int::GetBase2() {