On Wed, Apr 26, 2023 at 6:13 PM Dwight Kulkarni <dwi...@realtime-7.com> wrote:
>
> I ran address sanitizer: Heap use after free is the problem. I had to use
> the NEW operator to allocate the ram. What is weird is that usually it will
> error out right away after it goes out of scope, but this was delayed in
> recovering the memory, so it was working and then poof the memory disappears,
> but there is no access violation, it just returns bad result but only
> sometimes. Other times it is working and if there is a delay then the RAM
> gets reclaimed in that time and the error occurs right in the middle of the
> function. Really freaky.
>
> char* convert_cryptopp_integer_str(Integer n, size_t& msg_len){
> const size_t len = n.MinEncodedSize(Integer::UNSIGNED);
> char* v = new char[len];
> msg_len = len;
> n.Encode((byte*)v, len, Integer::UNSIGNED);
> return v;
> }
>
> std::vector<byte>* convert_cryptopp_integer(Integer n){
> const size_t len = n.MinEncodedSize(Integer::UNSIGNED);
> std::vector<byte>* v = new std::vector<byte>(len);
> n.Encode((byte*)v, v->size(), Integer::UNSIGNED);
> return v;
> }
So C-ish... Stop managing allocations with new and free. Let the std
C++ library do the work for you:
std::string convert_cryptopp_integer_str(const CryptoPP::Integer& n)
{
using namespace CryptoPP;
const size_t len = n.MinEncodedSize(Integer::UNSIGNED);
std::string v;
v.resize(len);
n.Encode((byte*)&v[0], v.size(), Integer::UNSIGNED);
return v;
}
std::vector<CryptoPP::byte> convert_cryptopp_integer(const CryptoPP::Integer& n)
{
using namespace CryptoPP;
const size_t len = n.MinEncodedSize(Integer::UNSIGNED);
std::vector<byte> v(len);
n.Encode((byte*)&v[len], v.size(), Integer::UNSIGNED);
return v;
}
Jeff
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