I am trying to generate hashes to use in a blockchain project, when looking for a crypto library i stumbled accross tomcrypt and chose to download it since it was easy to install, but now i have a problem, when I create the hashes (btw i'm usign SHA3_512 but the bug is present in every other SHA hashing algorithm) sometimes it outputs the correct hash but truncated
photo example Hash truncating example
this is the code for the hashing function
string hashSHA3_512(const std::string& input) {
//Initial
unsigned char* hashResult = new unsigned char[sha3_512_desc.hashsize];
//Initialize a state variable for the hash
hash_state md;
sha3_512_init(&md);
//Process the text - remember you can call process() multiple times
sha3_process(&md, (const unsigned char*) input.c_str(), input.size());
//Finish the hash calculation
sha3_done(&md, hashResult);
// Convert to string
string stringifiedHash(reinterpret_cast<char*>(hashResult));
// Return the result
return stringToHex(stringifiedHash);
}
and here is the code for the toHex function even if I already checked and the truncating hash problem pops up before this function is called
string stringToHex(const std::string& input)
{
static const char hex_digits[] = "0123456789abcdef";
std::string output;
output.reserve(input.length() * 2);
for (unsigned char c : input)
{
output.push_back(hex_digits[c >> 4]);
output.push_back(hex_digits[c & 15]);
}
return output;
}
if someone has knowledge about this library or in general about this problem and possible fixes pls explain to me, i'm stuck from 3 days
UPDATE I figured out the program is truncating the hashes when it encounters 2 consecutive zeros in hex so 8 zeros in binary (or simply 2 bytes) but I still don't understand why, if you do pls let me and hopefully other people with the same problem know
