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    How to Generate Whirlpool Hash with C++ and OpenSSL

    The Whirlpool Galaxy (M51) inspired the name of the algorithm.

    How to Generate Whirlpool Hash with C++ and OpenSSL

    In the previous article we showed how to generate Hash with MD5, as described there, the concepts will be similar.

    Whirlpool (sometimes called WHIRLPOOL ) is a cryptographic hash function based on an AES block cipher.

    It generates a hash of length of 128 characters.

    Using with C++

    For this example, we are going to hash the word Terminal Root . Follow the code below:

    whirlpool.cpp

    #include <iostream>
#include <iomanip>
#include <sstream>
#include <openssl/whrlpool.h>

std::string whirlpool(const std::string &str){
  unsigned char hash[WHIRLPOOL_DIGEST_LENGTH];

  WHIRLPOOL_CTX whirlpool;
  WHIRLPOOL_Init(&whirlpool);
  WHIRLPOOL_Update(&whirlpool, str.c_str(), str.size());
  WHIRLPOOL_Final(hash, &whirlpool);

  std::stringstream ss;

  for(int i = 0; i < WHIRLPOOL_DIGEST_LENGTH; i++){
    ss << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>( hash[i] );
  }
  return ss.str();
}

int main() {
  std::cout << whirlpool("Terminal Root") << '\n';
  return 0;
}

    To compile, run:

    g++ whirlpool.cpp -lcrypto

    The possible and expected output will be:

    edef01c730c67430584283292a59e3a6e910ecf7c903c0b1040243498c67053a849c0eacc07dfdbd76be36d2d1e50eaa0e0b6324f96743828eccdf8dac471891

    To check if it is correct, use the rhash command with the following arguments:

    rhash --whirlpool -m "Terminal Root"

    Links úteis

    cpp cryptography openssl

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