multisig.cpp File Reference

#include "ringct/rctSigs.h"
#include "cryptonote_basic/cryptonote_basic.h"
#include "multisig/multisig.h"
#include "common/apply_permutation.h"
#include "chaingen.h"
#include "multisig.h"
#include "device/device.hpp"

Include dependency graph for multisig.cpp:

Go to the source code of this file.

Functions
void	make_multisig_accounts (std::vector< cryptonote::account_base > &account, uint32_t threshold)

Function Documentation

make_multisig_accounts()

void make_multisig_accounts	(	std::vector< cryptonote::account_base > &	account,
		uint32_t	threshold )

Definition at line 44 of file multisig.cpp.

{
  std::vector<crypto::secret_key> all_view_keys;
  std::vector<std::vector<crypto::public_key>> derivations(account.size());
  //storage for all set of multisig derivations and spend public key (in first round)
  std::unordered_set<crypto::public_key> exchanging_keys;
 
  for (size_t msidx = 0; msidx < account.size(); ++msidx)
  {
    crypto::secret_key vkh = cryptonote::get_multisig_blinded_secret_key(account[msidx].get_keys().m_view_secret_key);
    all_view_keys.push_back(vkh);
 
    crypto::secret_key skh = cryptonote::get_multisig_blinded_secret_key(account[msidx].get_keys().m_spend_secret_key);
    crypto::public_key pskh;
    crypto::secret_key_to_public_key(skh, pskh);
 
    derivations[msidx].push_back(pskh);
    exchanging_keys.insert(pskh);
  }
 
  uint32_t roundsTotal = 1;
  if (threshold < account.size())
    roundsTotal = account.size() - threshold;
 
  //secret multisig keys of every account
  std::vector<std::vector<crypto::secret_key>> multisig_keys(account.size());
  std::vector<crypto::secret_key> spend_skey(account.size());
  std::vector<crypto::public_key> spend_pkey(account.size());
  for (uint32_t round = 0; round < roundsTotal; ++round)
  {
    std::unordered_set<crypto::public_key> roundKeys;
    for (size_t msidx = 0; msidx < account.size(); ++msidx)
    {
      // subtracting one's keys from set of all unique keys is the same as key exchange
      auto myKeys = exchanging_keys;
      for (const auto& d: derivations[msidx])
          myKeys.erase(d);
 
      if (threshold == account.size())
      {
        cryptonote::generate_multisig_N_N(account[msidx].get_keys(), std::vector<crypto::public_key>(myKeys.begin(), myKeys.end()), multisig_keys[msidx], (rct::key&)spend_skey[msidx], (rct::key&)spend_pkey[msidx]);
      }
      else
      {
        derivations[msidx] = cryptonote::generate_multisig_derivations(account[msidx].get_keys(), std::vector<crypto::public_key>(myKeys.begin(), myKeys.end()));
        roundKeys.insert(derivations[msidx].begin(), derivations[msidx].end());
      }
    }
 
    exchanging_keys = roundKeys;
    roundKeys.clear();
  }
 
  std::unordered_set<crypto::public_key> all_multisig_keys;
  for (size_t msidx = 0; msidx < account.size(); ++msidx)
  {
    std::unordered_set<crypto::secret_key> view_keys(all_view_keys.begin(), all_view_keys.end());
    view_keys.erase(all_view_keys[msidx]);
 
    crypto::secret_key view_skey = cryptonote::generate_multisig_view_secret_key(account[msidx].get_keys().m_view_secret_key, std::vector<secret_key>(view_keys.begin(), view_keys.end()));
    if (threshold < account.size())
    {
      multisig_keys[msidx] = cryptonote::calculate_multisig_keys(derivations[msidx]);
      spend_skey[msidx] = cryptonote::calculate_multisig_signer_key(multisig_keys[msidx]);
    }
    account[msidx].make_multisig(view_skey, spend_skey[msidx], spend_pkey[msidx], multisig_keys[msidx]);
    for (const auto &k: multisig_keys[msidx]) {
      all_multisig_keys.insert(rct::rct2pk(rct::scalarmultBase(rct::sk2rct(k))));
    }
  }
 
  if (threshold < account.size())
  {
    std::vector<crypto::public_key> public_keys(std::vector<crypto::public_key>(all_multisig_keys.begin(), all_multisig_keys.end()));
    crypto::public_key spend_pkey = cryptonote::generate_multisig_M_N_spend_public_key(public_keys);
 
    for (size_t msidx = 0; msidx < account.size(); ++msidx)
      account[msidx].finalize_multisig(spend_pkey);
  }
}

Here is the call graph for this function: