lokinet/llarp/proofofwork.cpp
2018-08-10 17:34:11 -04:00

58 lines
1.1 KiB
C++

#include <llarp/time.h>
#include <cmath>
#include <llarp/pow.hpp>
#include "buffer.hpp"
namespace llarp
{
PoW::~PoW()
{
}
bool
PoW::DecodeKey(llarp_buffer_t k, llarp_buffer_t* val)
{
// TODO: implement me
return false;
}
bool
PoW::BEncode(llarp_buffer_t* buf) const
{
// TODO: implement me
if(!bencode_start_dict(buf))
return false;
return bencode_end(buf);
}
bool
PoW::IsValid(llarp_shorthash_func hashfunc) const
{
auto now = llarp_time_now_ms();
if(now - timestamp > (uint64_t(extendedLifetime) * 1000))
return false;
byte_t digest[SHORTHASHSIZE];
byte_t tmp[MaxSize];
auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
// encode
if(!BEncode(&buf))
return false;
// rewind
buf.sz = buf.cur - buf.base;
buf.cur = buf.base;
// hash
if(!hashfunc(digest, buf))
return false;
// check bytes required
uint32_t required = std::floor(std::log(extendedLifetime));
for(uint32_t idx = 0; idx < required; ++idx)
{
if(digest[idx])
return false;
}
return true;
}
} // namespace llarp