puttygen.c

   1 /*
   2  * PuTTY key generation front end.
   3  */
   4
   5 #include <windows.h>
   6 #include <commctrl.h>
   7 #include <time.h>
   8 #ifndef NO_SECURITY
   9 #include <aclapi.h>
  10 #endif
  11 #include <stdio.h>
  12
  13 #define PUTTY_DO_GLOBALS
  14
  15 #include "putty.h"
  16 #include "ssh.h"
  17 #include "winstuff.h"
  18
  19 #define WM_DONEKEY (WM_XUSER + 1)
  20
  21 #define KEYSIZE 1024
  22
  23 /*
  24  * TODO:
  25  *  - test the generated keys for actual working-RSA-key-hood
  26  *  - variable key size
  27  */
  28
  29 /* ----------------------------------------------------------------------
  30  * Progress report code. This is really horrible :-)
  31  */
  32 #define PHASE1TOTAL 0x10000
  33 #define PHASE2TOTAL 0x10000
  34 #define PHASE3TOTAL 0x04000
  35 #define PHASE1START 0
  36 #define PHASE2START (PHASE1TOTAL)
  37 #define PHASE3START (PHASE1TOTAL + PHASE2TOTAL)
  38 #define TOTALTOTAL  (PHASE1TOTAL + PHASE2TOTAL + PHASE3TOTAL)
  39 #define PROGRESSBIGRANGE 65535
  40 #define DIVISOR     ((TOTALTOTAL + PROGRESSBIGRANGE - 1) / PROGRESSBIGRANGE)
  41 #define PROGRESSRANGE (TOTALTOTAL / DIVISOR)
  42 struct progress {
  43     unsigned phase1param, phase1current, phase1n;
  44     unsigned phase2param, phase2current, phase2n;
  45     unsigned phase3mult;
  46     HWND progbar;
  47 };
  48
  49 static void progress_update(void *param, int phase, int iprogress) {
  50     struct progress *p = (struct progress *)param;
  51     unsigned progress = iprogress;
  52     int position;
  53
  54     switch (phase) {
  55       case -1:
  56         p->phase1param = 0x10000 + progress;
  57         p->phase1current = 0x10000; p->phase1n = 0;
  58         return;
  59       case -2:
  60         p->phase2param = 0x10000 + progress;
  61         p->phase2current = 0x10000; p->phase2n = 0;
  62         return;
  63       case -3:
  64         p->phase3mult = PHASE3TOTAL / progress;
  65         return;
  66       case 1:
  67         while (p->phase1n < progress) {
  68             p->phase1n++;
  69             p->phase1current *= p->phase1param;
  70             p->phase1current /= 0x10000;
  71         }
  72         position = PHASE1START + 0x10000 - p->phase1current;
  73         break;
  74       case 2:
  75         while (p->phase2n < progress) {
  76             p->phase2n++;
  77             p->phase2current *= p->phase2param;
  78             p->phase2current /= 0x10000;
  79         }
  80         position = PHASE2START + 0x10000 - p->phase2current;
  81         break;
  82       case 3:
  83         position = PHASE3START + progress * p->phase3mult;
  84         break;
  85     }
  86
  87     SendMessage(p->progbar, PBM_SETPOS, position / DIVISOR, 0);
  88 }
  89
  90 extern char ver[];
  91
  92 #define PASSPHRASE_MAXLEN 512
  93
  94 struct PassphraseProcStruct {
  95     char *passphrase;
  96     char *comment;
  97 };
  98
  99 /*
 100  * Dialog-box function for the passphrase box.
 101  */
 102 static int CALLBACK PassphraseProc(HWND hwnd, UINT msg,
 103                                    WPARAM wParam, LPARAM lParam) {
 104     static char *passphrase;
 105     struct PassphraseProcStruct *p;
 106
 107     switch (msg) {
 108       case WM_INITDIALOG:
 109         SetForegroundWindow(hwnd);
 110         SetWindowPos (hwnd, HWND_TOP, 0, 0, 0, 0,
 111                       SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
 112         p = (struct PassphraseProcStruct *)lParam;
 113         passphrase = p->passphrase;
 114         if (p->comment)
 115             SetDlgItemText(hwnd, 101, p->comment);
 116         *passphrase = 0;
 117         return 0;
 118       case WM_COMMAND:
 119         switch (LOWORD(wParam)) {
 120           case IDOK:
 121             if (*passphrase)
 122                 EndDialog (hwnd, 1);
 123             else
 124                 MessageBeep (0);
 125             return 0;
 126           case IDCANCEL:
 127             EndDialog (hwnd, 0);
 128             return 0;
 129           case 102:                    /* edit box */
 130             if (HIWORD(wParam) == EN_CHANGE) {
 131                 GetDlgItemText (hwnd, 102, passphrase, PASSPHRASE_MAXLEN-1);
 132                 passphrase[PASSPHRASE_MAXLEN-1] = '\0';
 133             }
 134             return 0;
 135         }
 136         return 0;
 137       case WM_CLOSE:
 138         EndDialog (hwnd, 0);
 139         return 0;
 140     }
 141     return 0;
 142 }
 143
 144 /*
 145  * Prompt for a key file. Assumes the filename buffer is of size
 146  * FILENAME_MAX.
 147  */
 148 static int prompt_keyfile(HWND hwnd, char *dlgtitle,
 149                           char *filename, int save) {
 150     OPENFILENAME of;
 151     memset(&of, 0, sizeof(of));
 152 #ifdef OPENFILENAME_SIZE_VERSION_400
 153     of.lStructSize = OPENFILENAME_SIZE_VERSION_400;
 154 #else
 155     of.lStructSize = sizeof(of);
 156 #endif
 157     of.hwndOwner = hwnd;
 158     of.lpstrFilter = "All Files\0*\0\0\0";
 159     of.lpstrCustomFilter = NULL;
 160     of.nFilterIndex = 1;
 161     of.lpstrFile = filename; *filename = '\0';
 162     of.nMaxFile = FILENAME_MAX;
 163     of.lpstrFileTitle = NULL;
 164     of.lpstrInitialDir = NULL;
 165     of.lpstrTitle = dlgtitle;
 166     of.Flags = 0;
 167     if (save)
 168         return GetSaveFileName(&of);
 169     else
 170         return GetOpenFileName(&of);
 171 }
 172
 173 /*
 174  * This function is needed to link with the DES code. We need not
 175  * have it do anything at all.
 176  */
 177 void logevent(char *msg) {
 178 }
 179
 180 /*
 181  * Dialog-box function for the Licence box.
 182  */
 183 static int CALLBACK LicenceProc (HWND hwnd, UINT msg,
 184                                  WPARAM wParam, LPARAM lParam) {
 185     switch (msg) {
 186       case WM_INITDIALOG:
 187         return 1;
 188       case WM_COMMAND:
 189         switch (LOWORD(wParam)) {
 190           case IDOK:
 191             EndDialog(hwnd, 1);
 192             return 0;
 193         }
 194         return 0;
 195       case WM_CLOSE:
 196         EndDialog(hwnd, 1);
 197         return 0;
 198     }
 199     return 0;
 200 }
 201
 202 /*
 203  * Dialog-box function for the About box.
 204  */
 205 static int CALLBACK AboutProc (HWND hwnd, UINT msg,
 206                                WPARAM wParam, LPARAM lParam) {
 207     switch (msg) {
 208       case WM_INITDIALOG:
 209         SetDlgItemText (hwnd, 100, ver);
 210         return 1;
 211       case WM_COMMAND:
 212         switch (LOWORD(wParam)) {
 213           case IDOK:
 214             EndDialog(hwnd, 1);
 215             return 0;
 216           case 101:
 217             EnableWindow(hwnd, 0);
 218             DialogBox (hinst, MAKEINTRESOURCE(214), NULL, LicenceProc);
 219             EnableWindow(hwnd, 1);
 220             SetActiveWindow(hwnd);
 221             return 0;
 222         }
 223         return 0;
 224       case WM_CLOSE:
 225         EndDialog(hwnd, 1);
 226         return 0;
 227     }
 228     return 0;
 229 }
 230
 231 /*
 232  * Thread to generate a key.
 233  */
 234 struct rsa_key_thread_params {
 235     HWND progressbar;                  /* notify this with progress */
 236     HWND dialog;                       /* notify this on completion */
 237     struct RSAKey *key;
 238     struct RSAAux *aux;
 239 };
 240 static DWORD WINAPI generate_rsa_key_thread(void *param) {
 241     struct rsa_key_thread_params *params =
 242         (struct rsa_key_thread_params *)param;
 243     struct progress prog;
 244     prog.progbar = params->progressbar;
 245
 246     rsa_generate(params->key, params->aux, KEYSIZE, progress_update, &prog);
 247
 248     PostMessage(params->dialog, WM_DONEKEY, 0, 0);
 249
 250     free(params);
 251     return 0;
 252 }
 253
 254 struct MainDlgState {
 255     int collecting_entropy;
 256     int generation_thread_exists;
 257     int key_exists;
 258     int entropy_got, entropy_required, entropy_size;
 259     unsigned *entropy;
 260     struct RSAKey key;
 261     struct RSAAux aux;
 262 };
 263
 264 static void hidemany(HWND hwnd, const int *ids, int hideit) {
 265     while (*ids) {
 266         ShowWindow(GetDlgItem(hwnd, *ids++), (hideit ? SW_HIDE : SW_SHOW));
 267     }
 268 }
 269
 270 static void setupbigedit(HWND hwnd, int id, struct RSAKey *key) {
 271     char *buffer;
 272     char *dec1, *dec2;
 273
 274     dec1 = bignum_decimal(key->exponent);
 275     dec2 = bignum_decimal(key->modulus);
 276     buffer = malloc(strlen(dec1)+strlen(dec2)+
 277                     strlen(key->comment)+30);
 278     sprintf(buffer, "%d %s %s %s",
 279             ssh1_bignum_bitcount(key->modulus),
 280             dec1, dec2, key->comment);
 281     SetDlgItemText(hwnd, id, buffer);
 282     free(dec1);
 283     free(dec2);
 284     free(buffer);
 285 }
 286
 287 /*
 288  * Dialog-box function for the main PuTTYgen dialog box.
 289  */
 290 static int CALLBACK MainDlgProc (HWND hwnd, UINT msg,
 291                                  WPARAM wParam, LPARAM lParam) {
 292     enum {
 293         controlidstart = 100,
 294         IDC_TITLE,
 295         IDC_BOX_KEY, IDC_BOXT_KEY,
 296         IDC_NOKEY,
 297         IDC_GENERATING,
 298         IDC_PROGRESS,
 299         IDC_PKSTATIC, IDC_KEYDISPLAY,
 300         IDC_FPSTATIC, IDC_FINGERPRINT,
 301         IDC_COMMENTSTATIC, IDC_COMMENTEDIT,
 302         IDC_PASSPHRASE1STATIC, IDC_PASSPHRASE1EDIT,
 303         IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT,
 304         IDC_BOX_ACTIONS, IDC_BOXT_ACTIONS,
 305         IDC_GENSTATIC, IDC_GENERATE,
 306         IDC_LOADSTATIC, IDC_LOAD,
 307         IDC_SAVESTATIC, IDC_SAVE,
 308         IDC_ABOUT,
 309     };
 310     static const int nokey_ids[] = { IDC_NOKEY, 0 };
 311     static const int generating_ids[] = { IDC_GENERATING, IDC_PROGRESS, 0 };
 312     static const int gotkey_ids[] = {
 313         IDC_PKSTATIC, IDC_KEYDISPLAY,
 314         IDC_FPSTATIC, IDC_FINGERPRINT,
 315         IDC_COMMENTSTATIC, IDC_COMMENTEDIT,
 316         IDC_PASSPHRASE1STATIC, IDC_PASSPHRASE1EDIT,
 317         IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT, 0 };
 318     static const char generating_msg[] =
 319         "Please wait while a key is generated...";
 320     static const char entropy_msg[] =
 321         "Please move the mouse in this window to generate randomness";
 322     struct MainDlgState *state;
 323
 324     switch (msg) {
 325       case WM_INITDIALOG:
 326         state = malloc(sizeof(*state));
 327         state->generation_thread_exists = FALSE;
 328         state->key_exists = FALSE;
 329         SetWindowLong(hwnd, GWL_USERDATA, (LONG)state);
 330         {
 331             struct ctlpos cp, cp2;
 332
 333             /* Accelerators used: acglops */
 334
 335             ctlposinit(&cp, hwnd, 10, 10, 10);
 336             bartitle(&cp, "Public and private key generation for PuTTY",
 337                     IDC_TITLE);
 338             beginbox(&cp, "Key",
 339                      IDC_BOX_KEY, IDC_BOXT_KEY);
 340             cp2 = cp;
 341             statictext(&cp2, "No key.", IDC_NOKEY);
 342             cp2 = cp;
 343             statictext(&cp2, "",
 344                        IDC_GENERATING);
 345             progressbar(&cp2, IDC_PROGRESS);
 346             bigeditctrl(&cp,
 347                         "&Public key for pasting into authorized_keys file:",
 348                         IDC_PKSTATIC, IDC_KEYDISPLAY, 7);
 349             SendDlgItemMessage(hwnd, IDC_KEYDISPLAY, EM_SETREADONLY, 1, 0);
 350             staticedit(&cp, "Key fingerprint:", IDC_FPSTATIC,
 351                        IDC_FINGERPRINT, 70);
 352             SendDlgItemMessage(hwnd, IDC_FINGERPRINT, EM_SETREADONLY, 1, 0);
 353             staticedit(&cp, "Key &comment:", IDC_COMMENTSTATIC,
 354                        IDC_COMMENTEDIT, 70);
 355             staticpassedit(&cp, "Key p&assphrase:", IDC_PASSPHRASE1STATIC,
 356                            IDC_PASSPHRASE1EDIT, 70);
 357             staticpassedit(&cp, "C&onfirm passphrase:", IDC_PASSPHRASE2STATIC,
 358                            IDC_PASSPHRASE2EDIT, 70);
 359             endbox(&cp);
 360             beginbox(&cp, "Actions",
 361                      IDC_BOX_ACTIONS, IDC_BOXT_ACTIONS);
 362             staticbtn(&cp, "Generate a public/private key pair",
 363                       IDC_GENSTATIC, "&Generate", IDC_GENERATE);
 364             staticbtn(&cp, "Load an existing private key file",
 365                       IDC_LOADSTATIC, "&Load", IDC_LOAD);
 366             staticbtn(&cp, "Save the generated key to a new file",
 367                       IDC_SAVESTATIC, "&Save", IDC_SAVE);
 368             endbox(&cp);
 369         }
 370         /*
 371          * Initially, hide the progress bar and the key display,
 372          * and show the no-key display. Also disable the Save
 373          * button, because with no key we obviously can't save
 374          * anything.
 375          */
 376         hidemany(hwnd, nokey_ids, FALSE);
 377         hidemany(hwnd, generating_ids, TRUE);
 378         hidemany(hwnd, gotkey_ids, TRUE);
 379         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 0);
 380
 381         return 1;
 382       case WM_MOUSEMOVE:
 383         state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 384         if (state->collecting_entropy) {
 385             state->entropy[state->entropy_got++] = lParam;
 386             state->entropy[state->entropy_got++] = GetMessageTime();
 387             SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS,
 388                                state->entropy_got, 0);
 389             if (state->entropy_got >= state->entropy_required) {
 390                 struct rsa_key_thread_params *params;
 391                 DWORD threadid;
 392
 393                 /*
 394                  * Seed the entropy pool
 395                  */
 396                 random_add_heavynoise(state->entropy, state->entropy_size);
 397                 memset(state->entropy, 0, state->entropy_size);
 398                 free(state->entropy);
 399
 400                 SetDlgItemText(hwnd, IDC_GENERATING, generating_msg);
 401                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
 402                                    MAKELPARAM(0, PROGRESSRANGE));
 403                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, 0, 0);
 404
 405                 params = malloc(sizeof(*params));
 406                 params->progressbar = GetDlgItem(hwnd, IDC_PROGRESS);
 407                 params->dialog = hwnd;
 408                 params->key = &state->key;
 409                 params->aux = &state->aux;
 410
 411                 if (!CreateThread(NULL, 0, generate_rsa_key_thread,
 412                                   params, 0, &threadid)) {
 413                     MessageBox(hwnd, "Out of thread resources",
 414                                "Key generation error",
 415                                MB_OK | MB_ICONERROR);
 416                     free(params);
 417                 } else {
 418                     state->generation_thread_exists = TRUE;
 419                     state->collecting_entropy = FALSE;
 420                 }
 421             }
 422         }
 423         break;
 424       case WM_COMMAND:
 425         switch (LOWORD(wParam)) {
 426           case IDC_COMMENTEDIT:
 427             if (HIWORD(wParam) == EN_CHANGE) {
 428                 state = (struct MainDlgState *)
 429                     GetWindowLong(hwnd, GWL_USERDATA);
 430                 if (state->key_exists) {
 431                     HWND editctl = GetDlgItem(hwnd, IDC_COMMENTEDIT);
 432                     int len = GetWindowTextLength(editctl);
 433                     if (state->key.comment)
 434                         free(state->key.comment);
 435                     state->key.comment = malloc(len+1);
 436                     GetWindowText(editctl, state->key.comment, len+1);
 437                 }
 438             }
 439             break;
 440           case IDC_ABOUT:
 441             EnableWindow(hwnd, 0);
 442             DialogBox (hinst, MAKEINTRESOURCE(213), NULL, AboutProc);
 443             EnableWindow(hwnd, 1);
 444             SetActiveWindow(hwnd);
 445             return 0;
 446           case IDC_GENERATE:
 447             state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 448             if (!state->generation_thread_exists) {
 449                 hidemany(hwnd, nokey_ids, TRUE);
 450                 hidemany(hwnd, generating_ids, FALSE);
 451                 hidemany(hwnd, gotkey_ids, TRUE);
 452                 EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 0);
 453                 EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 0);
 454                 EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 0);
 455                 state->key_exists = FALSE;
 456                 SetDlgItemText(hwnd, IDC_GENERATING, entropy_msg);
 457                 state->collecting_entropy = TRUE;
 458
 459                 /*
 460                  * My brief statistical tests on mouse movements
 461                  * suggest that there are about 5 bits of
 462                  * randomness in the x position, 5 in the y
 463                  * position, and 1.7 in the message time, making
 464                  * 11.7 bits of unpredictability per mouse
 465                  * movement. However, other people have told me
 466                  * it's far less than that, so I'm going to be
 467                  * stupidly cautious and knock that down to a nice
 468                  * round 4.
 469                  */
 470                 state->entropy_required = (KEYSIZE / 4) * 2;
 471                 state->entropy_got = 0;
 472                 state->entropy_size = (state->entropy_required *
 473                                        sizeof(*state->entropy));
 474                 state->entropy = malloc(state->entropy_size);
 475
 476                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
 477                                    MAKELPARAM(0, state->entropy_required));
 478                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, 0, 0);
 479             }
 480             break;
 481           case IDC_SAVE:
 482             state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 483             if (state->key_exists) {
 484                 char filename[FILENAME_MAX];
 485                 char passphrase[PASSPHRASE_MAXLEN];
 486                 char passphrase2[PASSPHRASE_MAXLEN];
 487                 GetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT,
 488                                passphrase, sizeof(passphrase));
 489                 GetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT,
 490                                passphrase2, sizeof(passphrase2));
 491                 if (strcmp(passphrase, passphrase2)) {
 492                     MessageBox(hwnd,
 493                                "The two passphrases given do not match.",
 494                                "PuTTYgen Error",
 495                                MB_OK | MB_ICONERROR);
 496                     break;
 497                 }
 498                 if (!*passphrase) {
 499                     int ret;
 500                     ret = MessageBox(hwnd,
 501                                      "Are you sure you want to save this key\n"
 502                                      "without a passphrase to protect it?",
 503                                      "PuTTYgen Warning",
 504                                      MB_YESNO | MB_ICONWARNING);
 505                     if (ret != IDYES)
 506                         break;
 507                 }
 508                 if (prompt_keyfile(hwnd, "Save private key as:",
 509                                    filename, 1)) {
 510                     int ret;
 511                     FILE *fp = fopen(filename, "r");
 512                     if (fp) {
 513                         char buffer[FILENAME_MAX+80];
 514                         fclose(fp);
 515                         sprintf(buffer, "Overwrite existing file\n%.*s?",
 516                                 FILENAME_MAX, filename);
 517                         ret = MessageBox(hwnd, buffer, "PuTTYgen Warning",
 518                                          MB_YESNO | MB_ICONWARNING);
 519                         if (ret != IDYES)
 520                             break;
 521                     }
 522                     ret = saversakey(filename, &state->key, &state->aux,
 523                                      *passphrase ? passphrase : NULL);
 524                     if (ret <= 0) {
 525                         MessageBox(hwnd, "Unable to save key file",
 526                                    "PuTTYgen Error",
 527                                    MB_OK | MB_ICONERROR);
 528                     }
 529                 }
 530             }
 531             break;
 532           case IDC_LOAD:
 533             state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 534             if (!state->generation_thread_exists) {
 535                 char filename[FILENAME_MAX];
 536                 if (prompt_keyfile(hwnd, "Load private key:",
 537                                    filename, 0)) {
 538                     char passphrase[PASSPHRASE_MAXLEN];
 539                     int needs_pass;
 540                     int ret;
 541                     char *comment;
 542                     struct PassphraseProcStruct pps;
 543                     struct RSAKey newkey;
 544                     struct RSAAux newaux;
 545
 546                     needs_pass = rsakey_encrypted(filename, &comment);
 547                     pps.passphrase = passphrase;
 548                     pps.comment = comment;
 549                     do {
 550                         if (needs_pass) {
 551                             int dlgret;
 552                             dlgret = DialogBoxParam(hinst,
 553                                                     MAKEINTRESOURCE(210),
 554                                                     NULL, PassphraseProc,
 555                                                     (LPARAM)&pps);
 556                             if (!dlgret) {
 557                                 ret = -2;
 558                                 break;
 559                             }
 560                         } else
 561                             *passphrase = '\0';
 562                         ret = loadrsakey(filename, &newkey, &newaux,
 563                                          passphrase);
 564                     } while (ret == -1);
 565                     if (comment) free(comment);
 566                     if (ret == 0) {
 567                         MessageBox(NULL, "Couldn't load private key.",
 568                                    "PuTTYgen Error", MB_OK | MB_ICONERROR);
 569                     } else if (ret == 1) {
 570                         state->key = newkey;
 571                         state->aux = newaux;
 572
 573                         EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 1);
 574                         EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 1);
 575                         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 1);
 576                         /*
 577                          * Now update the key controls with all the
 578                          * key data.
 579                          */
 580                         {
 581                             char buf[128];
 582                             SetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT,
 583                                            passphrase);
 584                             SetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT,
 585                                            passphrase);
 586                             SetDlgItemText(hwnd, IDC_COMMENTEDIT,
 587                                            state->key.comment);
 588                             /*
 589                              * Set the key fingerprint.
 590                              */
 591                             {
 592                                 char *savecomment = state->key.comment;
 593                                 state->key.comment = NULL;
 594                                 rsa_fingerprint(buf, sizeof(buf), &state->key);
 595                                 state->key.comment = savecomment;
 596                             }
 597                             SetDlgItemText(hwnd, IDC_FINGERPRINT, buf);
 598                             /*
 599                              * Construct a decimal representation
 600                              * of the key, for pasting into
 601                              * .ssh/authorized_keys on a Unix box.
 602                              */
 603                             setupbigedit(hwnd, IDC_KEYDISPLAY, &state->key);
 604                         }
 605                         /*
 606                          * Finally, hide the progress bar and show
 607                          * the key data.
 608                          */
 609                         hidemany(hwnd, nokey_ids, TRUE);
 610                         hidemany(hwnd, generating_ids, TRUE);
 611                         hidemany(hwnd, gotkey_ids, FALSE);
 612                         state->key_exists = TRUE;
 613                     }
 614                 }
 615             }
 616             break;
 617         }
 618         return 0;
 619       case WM_DONEKEY:
 620         state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 621         state->generation_thread_exists = FALSE;
 622         state->key_exists = TRUE;
 623         SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, PROGRESSRANGE, 0);
 624         EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 1);
 625         EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 1);
 626         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 1);
 627         /*
 628          * Invent a comment for the key. We'll do this by including
 629          * the date in it. This will be so horrifyingly ugly that
 630          * the user will immediately want to change it, which is
 631          * what we want :-)
 632          */
 633         state->key.comment = malloc(30);
 634         {
 635             time_t t;
 636             struct tm *tm;
 637             time(&t);
 638             tm = localtime(&t);
 639             strftime(state->key.comment, 30, "rsa-key-%Y%m%d", tm);
 640         }
 641
 642         /*
 643          * Now update the key controls with all the key data.
 644          */
 645         {
 646             char buf[128];
 647             /*
 648              * Blank passphrase, initially. This isn't dangerous,
 649              * because we will warn (Are You Sure?) before allowing
 650              * the user to save an unprotected private key.
 651              */
 652             SetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT, "");
 653             SetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT, "");
 654             /*
 655              * Set the comment.
 656              */
 657             SetDlgItemText(hwnd, IDC_COMMENTEDIT, state->key.comment);
 658             /*
 659              * Set the key fingerprint.
 660              */
 661             {
 662                 char *savecomment = state->key.comment;
 663                 state->key.comment = NULL;
 664                 rsa_fingerprint(buf, sizeof(buf), &state->key);
 665                 state->key.comment = savecomment;
 666             }
 667             SetDlgItemText(hwnd, IDC_FINGERPRINT, buf);
 668             /*
 669              * Construct a decimal representation of the key, for
 670              * pasting into .ssh/authorized_keys on a Unix box.
 671              */
 672             setupbigedit(hwnd, IDC_KEYDISPLAY, &state->key);
 673         }
 674         /*
 675          * Finally, hide the progress bar and show the key data.
 676          */
 677         hidemany(hwnd, nokey_ids, TRUE);
 678         hidemany(hwnd, generating_ids, TRUE);
 679         hidemany(hwnd, gotkey_ids, FALSE);
 680         break;
 681       case WM_CLOSE:
 682         state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 683         free(state);
 684         EndDialog(hwnd, 1);
 685         return 0;
 686     }
 687     return 0;
 688 }
 689
 690 int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show) {
 691     InitCommonControls();
 692     hinst = inst;
 693     random_init();
 694     return DialogBox(hinst, MAKEINTRESOURCE(201), NULL, MainDlgProc) != IDOK;
 695 }