Issue1011, Add CLI startup option to only generate keys

libraries/wallet/include/graphene/wallet/wallet.hpp

@@ -274,6 +274,15 @@ class utility {
        * @return A list of keys that are deterministically derived from the brainkey
        */
       static vector<brain_key_info> derive_owner_keys_from_brain_key(string brain_key, int number_of_desired_keys = 1);
+
+      /** Suggests a safe brain key to use for creating your account.
+       * \c create_account_with_brain_key() requires you to specify a 'brain key',
+       * a long passphrase that provides enough entropy to generate cyrptographic
+       * keys.  This function will suggest a suitably random string that should
+       * be easy to write down (and, with effort, memorize).
+       * @returns a suggested brain_key
+       */
+      static brain_key_info suggest_brain_key();
 };
 
 struct operation_detail {

libraries/wallet/wallet.cpp

@@ -2776,6 +2776,36 @@ namespace graphene { namespace wallet {
 
       return results;
    }
+
+   brain_key_info utility::suggest_brain_key()
+   {
+      brain_key_info result;
+      // create a private key for secure entropy
+      fc::sha256 sha_entropy1 = fc::ecc::private_key::generate().get_secret();
+      fc::sha256 sha_entropy2 = fc::ecc::private_key::generate().get_secret();
+      fc::bigint entropy1(sha_entropy1.data(), sha_entropy1.data_size());
+      fc::bigint entropy2(sha_entropy2.data(), sha_entropy2.data_size());
+      fc::bigint entropy(entropy1);
+      entropy <<= 8 * sha_entropy1.data_size();
+      entropy += entropy2;
+      string brain_key = "";
+
+      for (int i = 0; i < BRAIN_KEY_WORD_COUNT; i++)
+      {
+         fc::bigint choice = entropy % graphene::words::word_list_size;
+         entropy /= graphene::words::word_list_size;
+         if (i > 0)
+            brain_key += " ";
+         brain_key += graphene::words::word_list[choice.to_int64()];
+      }
+
+      brain_key = detail::normalize_brain_key(brain_key);
+      fc::ecc::private_key priv_key = detail::derive_private_key(brain_key, 0);
+      result.brain_priv_key = brain_key;
+      result.wif_priv_key = key_to_wif(priv_key);
+      result.pub_key = priv_key.get_public_key();
+      return result;
+   }
 }}
 
 namespace graphene { namespace wallet {
@@ -2957,32 +2987,7 @@ vector<collateral_bid_object> wallet_api::get_collateral_bids(string asset, uint
 
 brain_key_info wallet_api::suggest_brain_key()const
 {
-   brain_key_info result;
-   // create a private key for secure entropy
-   fc::sha256 sha_entropy1 = fc::ecc::private_key::generate().get_secret();
-   fc::sha256 sha_entropy2 = fc::ecc::private_key::generate().get_secret();
-   fc::bigint entropy1( sha_entropy1.data(), sha_entropy1.data_size() );
-   fc::bigint entropy2( sha_entropy2.data(), sha_entropy2.data_size() );
-   fc::bigint entropy(entropy1);
-   entropy <<= 8*sha_entropy1.data_size();
-   entropy += entropy2;
-   string brain_key = "";
-
-   for( int i=0; i<BRAIN_KEY_WORD_COUNT; i++ )
-   {
-      fc::bigint choice = entropy % graphene::words::word_list_size;
-      entropy /= graphene::words::word_list_size;
-      if( i > 0 )
-         brain_key += " ";
-      brain_key += graphene::words::word_list[ choice.to_int64() ];
-   }
-
-   brain_key = normalize_brain_key(brain_key);
-   fc::ecc::private_key priv_key = derive_private_key( brain_key, 0 );
-   result.brain_priv_key = brain_key;
-   result.wif_priv_key = key_to_wif( priv_key );
-   result.pub_key = priv_key.get_public_key();
-   return result;
+   return graphene::wallet::utility::suggest_brain_key();
 }
 
 vector<brain_key_info> wallet_api::derive_owner_keys_from_brain_key(string brain_key, int number_of_desired_keys) const

programs/cli_wallet/main.cpp

@@ -86,6 +86,7 @@ int main( int argc, char** argv )
          ("daemon,d", "Run the wallet in daemon mode" )
          ("wallet-file,w", bpo::value<string>()->implicit_value("wallet.json"), "wallet to load")
          ("chain-id", bpo::value<string>(), "chain ID to connect to")
+         ("suggest-brain-key", "Suggest a safe brain key to use for craeting your account")
          ("version,v", "Display version information");
 
 
@@ -108,6 +109,13 @@ int main( int argc, char** argv )
          std::cout << "Websocket++: " << websocketpp::major_version << "." << websocketpp::minor_version << "." << websocketpp::patch_version << "\n";
          return 0;
       }
+      if( options.count("suggest-brain-key") )
+      {
+         auto keyinfo = graphene::wallet::utility::suggest_brain_key();
+         string data = fc::json::to_pretty_string( keyinfo );
+         std::cout << data.c_str() << std::endl;
+         return 0;
+      }
 
       fc::path data_dir;
       fc::logging_config cfg;