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Diffstat (limited to 'doc/examples/gtk/dsa.cpp')
| -rw-r--r-- | doc/examples/gtk/dsa.cpp | 566 |
1 files changed, 0 insertions, 566 deletions
diff --git a/doc/examples/gtk/dsa.cpp b/doc/examples/gtk/dsa.cpp deleted file mode 100644 index 2cd91b0e8..000000000 --- a/doc/examples/gtk/dsa.cpp +++ /dev/null @@ -1,566 +0,0 @@ -/* - This shows some of the details involved in a GUI application that uses - Botan. Actually most of the code is just dealing with GTK+, but it shows how - the password callback and pulse function stuff works. (See gtk_ui.cpp for the - acutal password callback code.) - - The major points of interest (assuming what you care about is how to use - Botan from a GUI, and not looking at my terrible GTK code) are gtk_ui.cpp - and, in this file, GTK_Pulse, gen_key(), and get_key(): - - gtk_ui.cpp and get_key() show how to get a passphrase from a user for - decrypting (well, in theory, anything), but in this case, PKCS #8 private - keys. Which is coincidentally the only thing Botan currently uses UI - objects for, though that will probably change eventually. GTK_UI does - double duty, for getting passphrases for encryption as well (in - do_save_key). - - gen_key() and GTK_Pulse show how to do an activity meter while doing a - long-term operation inside Botan. Since, typically, the only operations - which take a long time and can't be broken up into smaller parts are prime - generation/testing, that is currently where the pulse hooks are - called. It's certainly not the most general callback method in the world, - but it's general enough that it's usable without getting in the way too - much. The callbacks will eventually be extended to other parts of the - library (Pipe, maybe) where it's useful. - - This program is in the public domain. -*/ -#include <fstream> -#include <iostream> -#include <memory> - -#include <botan/botan.h> -#include <botan/libstate.h> -#include <botan/look_pk.h> -#include <botan/filters.h> -#include <botan/pk_filts.h> -#include <botan/dsa.h> - -// we don't have a 'using namespace' here, so it's easy to grep for code that -// is actually dealing with the library (rather than messing around with GTK). - -#include <gtk/gtk.h> -#include "gtk_ui.h" - -static Botan::RandomNumberGenerator* rng = 0; - -/* -* Pop up an message box -*/ -static void show_dialog(const std::string& about_message, - const std::string& dialog_name) - { - GtkDialogFlags flags = - (GtkDialogFlags)(GTK_DIALOG_DESTROY_WITH_PARENT | GTK_DIALOG_MODAL); - - GtkWidget* dialog = gtk_dialog_new_with_buttons(dialog_name.c_str(), - NULL, flags, - GTK_STOCK_OK, - GTK_RESPONSE_NONE, - NULL); - GtkWidget* label = gtk_label_new(NULL); - gtk_label_set_markup(GTK_LABEL(label), about_message.c_str()); - gtk_label_set_justify(GTK_LABEL(label), GTK_JUSTIFY_CENTER); - - g_signal_connect_swapped(GTK_OBJECT(dialog), "response", - G_CALLBACK(gtk_widget_destroy), - GTK_OBJECT(dialog)); - - gtk_container_add(GTK_CONTAINER(GTK_DIALOG(dialog)->vbox), label); - gtk_widget_show_all(dialog); - } - -/* -* Pop up an About box -*/ -static void show_about() - { - const std::string about_message = - "<big>DSA Utility</big>\n" - "\n" - "A simple application showing how to use Botan within a GUI.\n" - "It lets you generate or load keys, and sign text files.\n" - "\n" - "Send comments/questions to <tt>[email protected]</tt>"; - - show_dialog(about_message, "About"); - } - -/* -* Pop up a help box -*/ -static void show_help() - { - const std::string help_message = - "<big>DSA Utility Help</big>\n" - "\n" - "Simply, this is a (very) simple text editor, with the added ability\n" - "of being able to generate or read a DSA private key, and sign the\n" - "text buffer using that key.\n" - "\n" - "You can load, edit, and save text files as you would normally. If a\n" - "key is loaded (done using the commands in the Keys menu), you can\n" - "also use the Sign command (in the Signing menu) to generate a\n" - "signature for the current file. It will be displayed at the bottom\n" - "of the screen (if it has been calculated for the current buffer\n" - "contents), and can be saved using the \"Save Sig\" command.\n" - "\n" - "Signatures generated by this program can be verified using a the\n" - "<tt>dsa_ver</tt> example included in the Botan distribution.\n"; - - show_dialog(help_message, "Help"); - } - -/* -* Get and return a filename from the user -*/ -static std::string get_filename(const std::string& title) - { - GtkWidget* dialog = gtk_file_selection_new(title.c_str()); - - /* Some window managers don't display the titles of transient windows, - put a message elsewhere for those people. - */ - GtkWidget* label = gtk_label_new(title.c_str()); - gtk_container_add(GTK_CONTAINER(GTK_DIALOG(dialog)->vbox), label); - - std::string fsname; - - gtk_widget_show(label); /* dialog_run won't show sub-widgets */ - if(gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_OK) - fsname = gtk_file_selection_get_filename(GTK_FILE_SELECTION(dialog)); - gtk_widget_destroy(dialog); - - /* If it's a directory, that's no good */ - if(fsname.size() && fsname[fsname.size()-1] == '/') - return ""; - - return fsname; - } - -/* -* Global state -*/ -static Botan::DSA_PrivateKey* key = 0; // our key -static GtkTextBuffer* buffer = 0; // the text buffer -static std::string buffer_source; - // what file (if any) the buffer's data came from -static GtkWidget* sig_view = 0; // the signature - -/* -* Zap the currently set signature (if any) -*/ -static void zap_sig() - { - gtk_editable_delete_text(GTK_EDITABLE(sig_view), 0, -1); - } - -/* -* Save the current key -*/ -static void do_save_key(const std::string& title) - { - if(key == 0) - return; - - std::string filename = get_filename(title.c_str()); - - if(filename != "") - { - const std::string msg = "Select a passphrase to encrypt the key:"; - - std::ofstream out_priv(filename.c_str()); - - GTK_UI ui; - Botan::User_Interface::UI_Result result; - std::string passphrase = ui.get_passphrase(msg, result); - - if(result == Botan::User_Interface::OK) - out_priv << Botan::PKCS8::PEM_encode(*key, *rng, passphrase); - else - out_priv << Botan::PKCS8::PEM_encode(*key); - - // for testing - //std::cout << X509::PEM_encode(*key); - } - } - -/* -* Generate a signature for the text buffer -*/ -static void sign_buffer() - { - /* No key? Ignore request. */ - if(key == 0) - return; - - /* same format as the text-mode dsa_sign example */ - Botan::Pipe pipe(new Botan::PK_Signer_Filter( - Botan::get_pk_signer(*key, "EMSA1(SHA-1)"), *rng - ), - new Botan::Base64_Encoder - ); - - /* It would probably be smart to do this a little bit at a time */ - GtkTextIter start, end; - gtk_text_buffer_get_bounds(buffer, &start, &end); - gchar* bits = gtk_text_buffer_get_text(buffer, &start, &end, FALSE); - size_t length = strlen(bits); - - pipe.start_msg(); - pipe.write((unsigned char*)bits, length); - pipe.end_msg(); - - std::string sig = pipe.read_all_as_string(); - - zap_sig(); - - gint position = 0; - gtk_editable_insert_text(GTK_EDITABLE(sig_view), sig.c_str(), sig.length(), - &position); - - g_free(bits); - } - -#if 0 -/* -* GTK+ pulse callback -*/ -class GTK_Pulse : public Botan::Library_State::UI - { - public: - void pulse(Botan::Pulse_Type); - }; - -void GTK_Pulse::pulse(Botan::Pulse_Type) - { - /* We need this to flush the updates, otherwise GTK+ will wait until we're - done with the computation before doing any updates (generally the right - thing, but not with a progress bar). - */ - - while(gtk_events_pending()) - gtk_main_iteration(); - } -#endif - -/* -* Actual do the pulse (as a GTK+ timeout func) * -*/ -static gboolean gtk_pulse_timeout(void* pbar) - { - GtkWidget* progress_bar = (GtkWidget*)pbar; - gtk_progress_bar_pulse(GTK_PROGRESS_BAR(progress_bar)); - return TRUE; /* keep calling us */ - } - -/* -* Generate a new key -*/ -static void gen_key() - { - /* This gives a nice smooth progress bar, though we do use up quite a bit of - CPU for it. Keep in mind that if PULSE_INTERVAL is significantly less - than the average time between pulses from the library, the progress bar - will jerk around going slower or faster. Keep it at at least 50ms. - */ - const double PROGRESS_PER_PULSE = .01; /* % of bar */ - const guint32 PULSE_INTERVAL = 30; /* ms */ - - delete key; - - GtkDialogFlags flags = - (GtkDialogFlags)(GTK_DIALOG_DESTROY_WITH_PARENT | GTK_DIALOG_MODAL); - - GtkWidget* dialog = - gtk_dialog_new_with_buttons("Generating Key", NULL, flags, NULL); - - GtkWidget* label = gtk_label_new(" Generating new key, please wait... \n"); - gtk_container_add(GTK_CONTAINER(GTK_DIALOG(dialog)->vbox), label); - - GtkWidget* progress_bar = gtk_progress_bar_new(); - gtk_progress_bar_set_pulse_step(GTK_PROGRESS_BAR(progress_bar), - PROGRESS_PER_PULSE); - gtk_container_add(GTK_CONTAINER(GTK_DIALOG(dialog)->vbox), progress_bar); - - guint timer_id = gtk_timeout_add(PULSE_INTERVAL, gtk_pulse_timeout, - progress_bar); - - gtk_widget_show_all(dialog); - - while(gtk_events_pending()) - gtk_main_iteration(); - - /* Register gtk_pulse so it will be called every so often when we embark - on our prime generation quest... - */ - /* this just updates the GUI; the GTK+ timeout function actually updates - the progress bar. That's because the amount of time between pulses - from the library is rather irregular, so the progress bar looks jerky. - */ - //Botan::global_state().set_ui(new GTK_Pulse); - - /* Not generally recommended, since it's slow and there's not much point. - However, *because* it's slow, we'll want to put up a progress bar or - something, and part of this whole thing is to show how to do that and get - the pulse functions to do the right thing. - */ - Botan::DL_Group group(*rng, Botan::DL_Group::DSA_Kosherizer, 1024); - key = new Botan::DSA_PrivateKey(*rng, group); - - gtk_timeout_remove(timer_id); - //Botan::global_state().set_ui(0); // unset the pulse function - - gtk_widget_destroy(dialog); - - do_save_key("Save New Key"); - - /* new key, any old sigs are no longer useful */ - zap_sig(); - } - -/* -* Load up a key -*/ -static void get_key() - { - std::string fsname = get_filename("Select a DSA Key"); - - if(fsname != "") - { - try { - delete key; - key = 0; - zap_sig(); - - /* - A GTK_UI is a subclass of User_Interface that pops up a dialog that - asks the user for a passphrase. It actually works quite well, - though the fixed upper limit on the passphrase size is not - ideal. Feel free to use it as-is or modify it however you like - (gtk_ui.* is public domain). - */ - GTK_UI ui; - Botan::PKCS8_PrivateKey* p8_key = - Botan::PKCS8::load_key(fsname, *rng, ui); - - key = dynamic_cast<Botan::DSA_PrivateKey*>(p8_key); - if(!key) - show_dialog("The key in " + fsname + " is not a DSA key", - "Failure"); - } - catch(std::exception) - { - key = 0; // make sure it's not something random - show_dialog("Loading the key from " + fsname + " failed.", "Failure"); - } - } - } - -static void really_sign_buffer() - { - /* No key? Ask the user for one. */ - if(key == 0) - get_key(); - sign_buffer(); - } - -/* -* Clear the text buffer -*/ -static void new_buffer() - { - /* - In theory, it would be nice to check if this was unsaved text and prompt - to save it. However, this really isn't supposed to be a GTK+ example, so - we won't. - */ - gtk_text_buffer_set_text(buffer, "", -1); - buffer_source = ""; - } - -/* -* Put the contents of a file into the buffer -*/ -static void open_buffer() - { - std::string filename = get_filename("Select File"); - - if(filename == "") - return; - - std::ifstream in(filename.c_str()); - - new_buffer(); - buffer_source = filename; - - while(in.good()) - { - char buf[1024] = { 0 }; - - in.read(buf, 1024); - size_t got = in.gcount(); - - GtkTextIter iter; - gtk_text_buffer_get_end_iter(buffer, &iter); - gtk_text_buffer_insert(buffer, &iter, buf, got); - } - } - -/* -* Save the signature to a file -*/ -static void save_sig() - { - std::string sig_file = buffer_source; - - /* No sig, nothing to save */ - const gchar* sig = gtk_entry_get_text(GTK_ENTRY(sig_view)); - if(strlen(sig) == 0) - return; - - if(sig_file == "") - sig_file = get_filename("Select Signature Output File"); - else - sig_file += ".sig"; - - std::ofstream out(sig_file.c_str()); - out << sig << std::endl; - } - -/* -* Save the current key -*/ -static void save_key() - { - do_save_key("Save Current Key"); - } - -/* -* Common case of Save/Save As -*/ -static void do_save(const std::string& filename) - { - std::ofstream out(filename.c_str()); - - GtkTextIter start, end; - gtk_text_buffer_get_bounds(buffer, &start, &end); - gchar* bits = gtk_text_buffer_get_text(buffer, &start, &end, FALSE); - out.write(bits, strlen(bits)); - g_free(bits); - buffer_source = filename; - } - -/* -* Save the buffer -*/ -static void save_buffer_as() - { - std::string filename = get_filename("Select Output File"); - if(filename != "") - do_save(filename); - } - -/* -* Save the buffer -*/ -static void save_buffer() - { - if(buffer_source != "") - do_save(buffer_source); - else - save_buffer_as(); - } - -/* -* Make a menubar for the app -*/ -static GtkWidget* make_menubar(GtkWidget *window) - { - static GtkItemFactoryEntry menu_items[] = { - { "/_File", NULL, NULL, 0, "<Branch>", NULL }, - { "/File/_New", "<control>N", new_buffer, 0, NULL, NULL }, - { "/File/_Open", "<control>O", open_buffer, 0, NULL, NULL }, - { "/File/_Save", "<control>S", save_buffer, 0, NULL, NULL }, - { "/File/Save _As", NULL, save_buffer_as, 0, NULL, NULL }, - { "/File/sep1", NULL, NULL, 0, "<Separator>", NULL }, - { "/File/Save Sig", NULL, save_sig, 0, NULL, NULL }, - { "/File/sep2", NULL, NULL, 0, "<Separator>", NULL }, - { "/File/_Quit", "<control>Q", gtk_main_quit, 0, NULL, NULL }, - - { "/_Keys", NULL, NULL, 0, "<Branch>", NULL }, - { "/Keys/Open", NULL, get_key, 0, NULL, NULL }, - { "/Keys/_Generate", NULL, gen_key, 0, NULL, NULL }, - { "/Keys/Save Current", NULL, save_key, 0, NULL, NULL }, - - { "/Signing", NULL, NULL, 0, "<Branch>", NULL }, - { "/Signing/Sign", NULL, really_sign_buffer, 0, NULL, NULL }, - - { "/_Help", NULL, NULL, 0, "<LastBranch>", NULL }, - { "/Help/Help", NULL, show_help, 0, NULL, NULL }, - { "/Help/sep1", NULL, NULL, 0, "<Separator>", NULL }, - { "/Help/About", NULL, show_about, 0, NULL, NULL }, - }; - - GtkAccelGroup* accel_group = gtk_accel_group_new(); - GtkItemFactory* item_factory = - gtk_item_factory_new(GTK_TYPE_MENU_BAR, "<main>", accel_group); - const gint nmenu_items = sizeof(menu_items) / sizeof(menu_items[0]); - gtk_item_factory_create_items(item_factory, nmenu_items, menu_items, NULL); - gtk_window_add_accel_group(GTK_WINDOW(window), accel_group); - return gtk_item_factory_get_widget(item_factory, "<main>"); - } - -int main(int argc, char *argv[]) - { - gtk_init(&argc, &argv); - - try { - Botan::LibraryInitializer init; - - rng = new Botan::AutoSeeded_RNG; - - /* Create a new top-level window */ - GtkWidget* window = gtk_window_new(GTK_WINDOW_TOPLEVEL); - gtk_window_set_title(GTK_WINDOW(window), "DSA Utility"); - gtk_signal_connect(GTK_OBJECT(window), "delete_event", - gtk_main_quit, NULL); - - /* Create the vbox to hold our stuff */ - GtkWidget* vbox = gtk_vbox_new(FALSE, 0); - gtk_container_border_width(GTK_CONTAINER(vbox), 1); - gtk_container_add(GTK_CONTAINER(window), vbox); - - /* Create the menu bar */ - GtkWidget *menubar = make_menubar(window); - - /* Create the entry that holds the signature */ - sig_view = gtk_entry_new(); - gtk_editable_set_editable(GTK_EDITABLE(sig_view), FALSE); - - /* Create the text box */ - GtkWidget* view = gtk_text_view_new(); - buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(view)); - - gtk_widget_set_size_request(view, 640, 480); - gtk_text_buffer_set_text(buffer, "Some initial contents.", -1); - - // Resign it on each change: fast enough, but probably not really useful - //g_signal_connect(G_OBJECT(buffer), "changed", sign_buffer, 0); - g_signal_connect(G_OBJECT(buffer), "changed", zap_sig, 0); - - gtk_container_add(GTK_CONTAINER(vbox), menubar); - gtk_container_add(GTK_CONTAINER(vbox), view); - gtk_container_add(GTK_CONTAINER(vbox), sig_view); - - gtk_widget_show_all(window); - - gtk_main(); - } - catch(std::exception& e) - { - std::cout << e.what() << std::endl; - } - return 0; - } |