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 DEFAULT_KEYSIZE 1024
  22
  23 /* ----------------------------------------------------------------------
  24  * Progress report code. This is really horrible :-)
  25  */
  26 #define PHASE1TOTAL 0x10000
  27 #define PHASE2TOTAL 0x10000
  28 #define PHASE3TOTAL 0x04000
  29 #define PHASE1START 0
  30 #define PHASE2START (PHASE1TOTAL)
  31 #define PHASE3START (PHASE1TOTAL + PHASE2TOTAL)
  32 #define TOTALTOTAL  (PHASE1TOTAL + PHASE2TOTAL + PHASE3TOTAL)
  33 #define PROGRESSBIGRANGE 65535
  34 #define DIVISOR     ((TOTALTOTAL + PROGRESSBIGRANGE - 1) / PROGRESSBIGRANGE)
  35 #define PROGRESSRANGE (TOTALTOTAL / DIVISOR)
  36 struct progress {
  37     unsigned phase1param, phase1current, phase1n;
  38     unsigned phase2param, phase2current, phase2n;
  39     unsigned phase3mult;
  40     HWND progbar;
  41 };
  42
  43 static void progress_update(void *param, int phase, int iprogress) {
  44     struct progress *p = (struct progress *)param;
  45     unsigned progress = iprogress;
  46     int position;
  47
  48     switch (phase) {
  49       case -1:
  50         p->phase1param = 0x10000 + progress;
  51         p->phase1current = 0x10000; p->phase1n = 0;
  52         return;
  53       case -2:
  54         p->phase2param = 0x10000 + progress;
  55         p->phase2current = 0x10000; p->phase2n = 0;
  56         return;
  57       case -3:
  58         p->phase3mult = PHASE3TOTAL / progress;
  59         return;
  60       case 1:
  61         while (p->phase1n < progress) {
  62             p->phase1n++;
  63             p->phase1current *= p->phase1param;
  64             p->phase1current /= 0x10000;
  65         }
  66         position = PHASE1START + 0x10000 - p->phase1current;
  67         break;
  68       case 2:
  69         while (p->phase2n < progress) {
  70             p->phase2n++;
  71             p->phase2current *= p->phase2param;
  72             p->phase2current /= 0x10000;
  73         }
  74         position = PHASE2START + 0x10000 - p->phase2current;
  75         break;
  76       case 3:
  77         position = PHASE3START + progress * p->phase3mult;
  78         break;
  79     }
  80
  81     SendMessage(p->progbar, PBM_SETPOS, position / DIVISOR, 0);
  82 }
  83
  84 extern char ver[];
  85
  86 #define PASSPHRASE_MAXLEN 512
  87
  88 struct PassphraseProcStruct {
  89     char *passphrase;
  90     char *comment;
  91 };
  92
  93 /*
  94  * Dialog-box function for the passphrase box.
  95  */
  96 static int CALLBACK PassphraseProc(HWND hwnd, UINT msg,
  97                                    WPARAM wParam, LPARAM lParam) {
  98     static char *passphrase;
  99     struct PassphraseProcStruct *p;
 100
 101     switch (msg) {
 102       case WM_INITDIALOG:
 103         SetForegroundWindow(hwnd);
 104         SetWindowPos (hwnd, HWND_TOP, 0, 0, 0, 0,
 105                       SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
 106         p = (struct PassphraseProcStruct *)lParam;
 107         passphrase = p->passphrase;
 108         if (p->comment)
 109             SetDlgItemText(hwnd, 101, p->comment);
 110         *passphrase = 0;
 111         return 0;
 112       case WM_COMMAND:
 113         switch (LOWORD(wParam)) {
 114           case IDOK:
 115             if (*passphrase)
 116                 EndDialog (hwnd, 1);
 117             else
 118                 MessageBeep (0);
 119             return 0;
 120           case IDCANCEL:
 121             EndDialog (hwnd, 0);
 122             return 0;
 123           case 102:                    /* edit box */
 124             if (HIWORD(wParam) == EN_CHANGE) {
 125                 GetDlgItemText (hwnd, 102, passphrase, PASSPHRASE_MAXLEN-1);
 126                 passphrase[PASSPHRASE_MAXLEN-1] = '\0';
 127             }
 128             return 0;
 129         }
 130         return 0;
 131       case WM_CLOSE:
 132         EndDialog (hwnd, 0);
 133         return 0;
 134     }
 135     return 0;
 136 }
 137
 138 /*
 139  * Prompt for a key file. Assumes the filename buffer is of size
 140  * FILENAME_MAX.
 141  */
 142 static int prompt_keyfile(HWND hwnd, char *dlgtitle,
 143                           char *filename, int save) {
 144     OPENFILENAME of;
 145     memset(&of, 0, sizeof(of));
 146 #ifdef OPENFILENAME_SIZE_VERSION_400
 147     of.lStructSize = OPENFILENAME_SIZE_VERSION_400;
 148 #else
 149     of.lStructSize = sizeof(of);
 150 #endif
 151     of.hwndOwner = hwnd;
 152     of.lpstrFilter = "All Files\0*\0\0\0";
 153     of.lpstrCustomFilter = NULL;
 154     of.nFilterIndex = 1;
 155     of.lpstrFile = filename; *filename = '\0';
 156     of.nMaxFile = FILENAME_MAX;
 157     of.lpstrFileTitle = NULL;
 158     of.lpstrInitialDir = NULL;
 159     of.lpstrTitle = dlgtitle;
 160     of.Flags = 0;
 161     if (save)
 162         return GetSaveFileName(&of);
 163     else
 164         return GetOpenFileName(&of);
 165 }
 166
 167 /*
 168  * This function is needed to link with the DES code. We need not
 169  * have it do anything at all.
 170  */
 171 void logevent(char *msg) {
 172 }
 173
 174 /*
 175  * Dialog-box function for the Licence box.
 176  */
 177 static int CALLBACK LicenceProc (HWND hwnd, UINT msg,
 178                                  WPARAM wParam, LPARAM lParam) {
 179     switch (msg) {
 180       case WM_INITDIALOG:
 181         return 1;
 182       case WM_COMMAND:
 183         switch (LOWORD(wParam)) {
 184           case IDOK:
 185             EndDialog(hwnd, 1);
 186             return 0;
 187         }
 188         return 0;
 189       case WM_CLOSE:
 190         EndDialog(hwnd, 1);
 191         return 0;
 192     }
 193     return 0;
 194 }
 195
 196 /*
 197  * Dialog-box function for the About box.
 198  */
 199 static int CALLBACK AboutProc (HWND hwnd, UINT msg,
 200                                WPARAM wParam, LPARAM lParam) {
 201     switch (msg) {
 202       case WM_INITDIALOG:
 203         SetDlgItemText (hwnd, 100, ver);
 204         return 1;
 205       case WM_COMMAND:
 206         switch (LOWORD(wParam)) {
 207           case IDOK:
 208             EndDialog(hwnd, 1);
 209             return 0;
 210           case 101:
 211             EnableWindow(hwnd, 0);
 212             DialogBox (hinst, MAKEINTRESOURCE(214), NULL, LicenceProc);
 213             EnableWindow(hwnd, 1);
 214             SetActiveWindow(hwnd);
 215             return 0;
 216         }
 217         return 0;
 218       case WM_CLOSE:
 219         EndDialog(hwnd, 1);
 220         return 0;
 221     }
 222     return 0;
 223 }
 224
 225 /*
 226  * Thread to generate a key.
 227  */
 228 struct rsa_key_thread_params {
 229     HWND progressbar;                  /* notify this with progress */
 230     HWND dialog;                       /* notify this on completion */
 231     int keysize;                       /* bits in key */
 232     struct RSAKey *key;
 233     struct RSAAux *aux;
 234 };
 235 static DWORD WINAPI generate_rsa_key_thread(void *param) {
 236     struct rsa_key_thread_params *params =
 237         (struct rsa_key_thread_params *)param;
 238     struct progress prog;
 239     prog.progbar = params->progressbar;
 240
 241     rsa_generate(params->key, params->aux,
 242                  params->keysize, progress_update, &prog);
 243
 244     PostMessage(params->dialog, WM_DONEKEY, 0, 0);
 245
 246     free(params);
 247     return 0;
 248 }
 249
 250 struct MainDlgState {
 251     int collecting_entropy;
 252     int generation_thread_exists;
 253     int key_exists;
 254     int entropy_got, entropy_required, entropy_size;
 255     int keysize;
 256     unsigned *entropy;
 257     struct RSAKey key;
 258     struct RSAAux aux;
 259 };
 260
 261 static void hidemany(HWND hwnd, const int *ids, int hideit) {
 262     while (*ids) {
 263         ShowWindow(GetDlgItem(hwnd, *ids++), (hideit ? SW_HIDE : SW_SHOW));
 264     }
 265 }
 266
 267 static void setupbigedit(HWND hwnd, int id, struct RSAKey *key) {
 268     char *buffer;
 269     char *dec1, *dec2;
 270
 271     dec1 = bignum_decimal(key->exponent);
 272     dec2 = bignum_decimal(key->modulus);
 273     buffer = malloc(strlen(dec1)+strlen(dec2)+
 274                     strlen(key->comment)+30);
 275     sprintf(buffer, "%d %s %s %s",
 276             ssh1_bignum_bitcount(key->modulus),
 277             dec1, dec2, key->comment);
 278     SetDlgItemText(hwnd, id, buffer);
 279     free(dec1);
 280     free(dec2);
 281     free(buffer);
 282 }
 283
 284 /*
 285  * Dialog-box function for the main PuTTYgen dialog box.
 286  */
 287 static int CALLBACK MainDlgProc (HWND hwnd, UINT msg,
 288                                  WPARAM wParam, LPARAM lParam) {
 289     enum {
 290         controlidstart = 100,
 291         IDC_TITLE,
 292         IDC_BOX_KEY, IDC_BOXT_KEY,
 293         IDC_NOKEY,
 294         IDC_GENERATING,
 295         IDC_PROGRESS,
 296         IDC_PKSTATIC, IDC_KEYDISPLAY,
 297         IDC_FPSTATIC, IDC_FINGERPRINT,
 298         IDC_COMMENTSTATIC, IDC_COMMENTEDIT,
 299         IDC_PASSPHRASE1STATIC, IDC_PASSPHRASE1EDIT,
 300         IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT,
 301         IDC_BOX_ACTIONS, IDC_BOXT_ACTIONS,
 302         IDC_GENSTATIC, IDC_GENERATE,
 303         IDC_LOADSTATIC, IDC_LOAD,
 304         IDC_SAVESTATIC, IDC_SAVE,
 305         IDC_BOX_PARAMS, IDC_BOXT_PARAMS,
 306         IDC_BITSSTATIC, IDC_BITS,
 307         IDC_ABOUT,
 308     };
 309     static const int nokey_ids[] = { IDC_NOKEY, 0 };
 310     static const int generating_ids[] = { IDC_GENERATING, IDC_PROGRESS, 0 };
 311     static const int gotkey_ids[] = {
 312         IDC_PKSTATIC, IDC_KEYDISPLAY,
 313         IDC_FPSTATIC, IDC_FINGERPRINT,
 314         IDC_COMMENTSTATIC, IDC_COMMENTEDIT,
 315         IDC_PASSPHRASE1STATIC, IDC_PASSPHRASE1EDIT,
 316         IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT, 0 };
 317     static const char generating_msg[] =
 318         "Please wait while a key is generated...";
 319     static const char entropy_msg[] =
 320         "Please generate some randomness by moving the mouse over the blank area.";
 321     struct MainDlgState *state;
 322
 323     switch (msg) {
 324       case WM_INITDIALOG:
 325         state = malloc(sizeof(*state));
 326         state->generation_thread_exists = FALSE;
 327         state->key_exists = FALSE;
 328         SetWindowLong(hwnd, GWL_USERDATA, (LONG)state);
 329         {
 330             struct ctlpos cp, cp2;
 331
 332             /* Accelerators used: acglops */
 333
 334             ctlposinit(&cp, hwnd, 10, 10, 10);
 335             bartitle(&cp, "Public and private key generation for PuTTY",
 336                     IDC_TITLE);
 337             beginbox(&cp, "Key",
 338                      IDC_BOX_KEY, IDC_BOXT_KEY);
 339             cp2 = cp;
 340             statictext(&cp2, "No key.", IDC_NOKEY);
 341             cp2 = cp;
 342             statictext(&cp2, "",
 343                        IDC_GENERATING);
 344             progressbar(&cp2, IDC_PROGRESS);
 345             bigeditctrl(&cp,
 346                         "&Public key for pasting into authorized_keys file:",
 347                         IDC_PKSTATIC, IDC_KEYDISPLAY, 7);
 348             SendDlgItemMessage(hwnd, IDC_KEYDISPLAY, EM_SETREADONLY, 1, 0);
 349             staticedit(&cp, "Key fingerprint:", IDC_FPSTATIC,
 350                        IDC_FINGERPRINT, 70);
 351             SendDlgItemMessage(hwnd, IDC_FINGERPRINT, EM_SETREADONLY, 1, 0);
 352             staticedit(&cp, "Key &comment:", IDC_COMMENTSTATIC,
 353                        IDC_COMMENTEDIT, 70);
 354             staticpassedit(&cp, "Key p&assphrase:", IDC_PASSPHRASE1STATIC,
 355                            IDC_PASSPHRASE1EDIT, 70);
 356             staticpassedit(&cp, "C&onfirm passphrase:", IDC_PASSPHRASE2STATIC,
 357                            IDC_PASSPHRASE2EDIT, 70);
 358             endbox(&cp);
 359             beginbox(&cp, "Actions",
 360                      IDC_BOX_ACTIONS, IDC_BOXT_ACTIONS);
 361             staticbtn(&cp, "Generate a public/private key pair",
 362                       IDC_GENSTATIC, "&Generate", IDC_GENERATE);
 363             staticbtn(&cp, "Load an existing private key file",
 364                       IDC_LOADSTATIC, "&Load", IDC_LOAD);
 365             staticbtn(&cp, "Save the generated key to a new file",
 366                       IDC_SAVESTATIC, "&Save", IDC_SAVE);
 367             endbox(&cp);
 368             beginbox(&cp, "Actions",
 369                      IDC_BOX_ACTIONS, IDC_BOXT_ACTIONS);
 370             staticedit(&cp, "Number of &bits in a generated key:",
 371                        IDC_BITSSTATIC, IDC_BITS, 20);
 372             endbox(&cp);
 373         }
 374         SetDlgItemInt(hwnd, IDC_BITS, DEFAULT_KEYSIZE, FALSE);
 375
 376         /*
 377          * Initially, hide the progress bar and the key display,
 378          * and show the no-key display. Also disable the Save
 379          * button, because with no key we obviously can't save
 380          * anything.
 381          */
 382         hidemany(hwnd, nokey_ids, FALSE);
 383         hidemany(hwnd, generating_ids, TRUE);
 384         hidemany(hwnd, gotkey_ids, TRUE);
 385         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 0);
 386
 387         return 1;
 388       case WM_MOUSEMOVE:
 389         state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 390         if (state->collecting_entropy) {
 391             state->entropy[state->entropy_got++] = lParam;
 392             state->entropy[state->entropy_got++] = GetMessageTime();
 393             SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS,
 394                                state->entropy_got, 0);
 395             if (state->entropy_got >= state->entropy_required) {
 396                 struct rsa_key_thread_params *params;
 397                 DWORD threadid;
 398
 399                 /*
 400                  * Seed the entropy pool
 401                  */
 402                 random_add_heavynoise(state->entropy, state->entropy_size);
 403                 memset(state->entropy, 0, state->entropy_size);
 404                 free(state->entropy);
 405
 406                 SetDlgItemText(hwnd, IDC_GENERATING, generating_msg);
 407                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
 408                                    MAKELPARAM(0, PROGRESSRANGE));
 409                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, 0, 0);
 410
 411                 params = malloc(sizeof(*params));
 412                 params->progressbar = GetDlgItem(hwnd, IDC_PROGRESS);
 413                 params->dialog = hwnd;
 414                 params->keysize = state->keysize;
 415                 params->key = &state->key;
 416                 params->aux = &state->aux;
 417
 418                 if (!CreateThread(NULL, 0, generate_rsa_key_thread,
 419                                   params, 0, &threadid)) {
 420                     MessageBox(hwnd, "Out of thread resources",
 421                                "Key generation error",
 422                                MB_OK | MB_ICONERROR);
 423                     free(params);
 424                 } else {
 425                     state->generation_thread_exists = TRUE;
 426                     state->collecting_entropy = FALSE;
 427                 }
 428             }
 429         }
 430         break;
 431       case WM_COMMAND:
 432         switch (LOWORD(wParam)) {
 433           case IDC_COMMENTEDIT:
 434             if (HIWORD(wParam) == EN_CHANGE) {
 435                 state = (struct MainDlgState *)
 436                     GetWindowLong(hwnd, GWL_USERDATA);
 437                 if (state->key_exists) {
 438                     HWND editctl = GetDlgItem(hwnd, IDC_COMMENTEDIT);
 439                     int len = GetWindowTextLength(editctl);
 440                     if (state->key.comment)
 441                         free(state->key.comment);
 442                     state->key.comment = malloc(len+1);
 443                     GetWindowText(editctl, state->key.comment, len+1);
 444                 }
 445             }
 446             break;
 447           case IDC_ABOUT:
 448             EnableWindow(hwnd, 0);
 449             DialogBox (hinst, MAKEINTRESOURCE(213), NULL, AboutProc);
 450             EnableWindow(hwnd, 1);
 451             SetActiveWindow(hwnd);
 452             return 0;
 453           case IDC_GENERATE:
 454             state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 455             if (!state->generation_thread_exists) {
 456                 hidemany(hwnd, nokey_ids, TRUE);
 457                 hidemany(hwnd, generating_ids, FALSE);
 458                 hidemany(hwnd, gotkey_ids, TRUE);
 459                 EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 0);
 460                 EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 0);
 461                 EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 0);
 462                 state->key_exists = FALSE;
 463                 SetDlgItemText(hwnd, IDC_GENERATING, entropy_msg);
 464                 state->collecting_entropy = TRUE;
 465                 {
 466                     BOOL ok;
 467                     state->keysize = GetDlgItemInt(hwnd, IDC_BITS,
 468                                                    &ok, FALSE);
 469                     if (!ok) state->keysize = DEFAULT_KEYSIZE;
 470                 }
 471
 472                 /*
 473                  * My brief statistical tests on mouse movements
 474                  * suggest that there are about 2.5 bits of
 475                  * randomness in the x position, 2.5 in the y
 476                  * position, and 1.7 in the message time, making
 477                  * 5.7 bits of unpredictability per mouse movement.
 478                  * However, other people have told me it's far less
 479                  * than that, so I'm going to be stupidly cautious
 480                  * and knock that down to a nice round 2. With this
 481                  * method, we require two words per mouse movement,
 482                  * so with 2 bits per mouse movement we expect 2
 483                  * bits every 2 words.
 484                  */
 485                 state->entropy_required = (state->keysize/2) * 2;
 486                 state->entropy_got = 0;
 487                 state->entropy_size = (state->entropy_required *
 488                                        sizeof(*state->entropy));
 489                 state->entropy = malloc(state->entropy_size);
 490
 491                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
 492                                    MAKELPARAM(0, state->entropy_required));
 493                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, 0, 0);
 494             }
 495             break;
 496           case IDC_SAVE:
 497             state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 498             if (state->key_exists) {
 499                 char filename[FILENAME_MAX];
 500                 char passphrase[PASSPHRASE_MAXLEN];
 501                 char passphrase2[PASSPHRASE_MAXLEN];
 502                 GetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT,
 503                                passphrase, sizeof(passphrase));
 504                 GetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT,
 505                                passphrase2, sizeof(passphrase2));
 506                 if (strcmp(passphrase, passphrase2)) {
 507                     MessageBox(hwnd,
 508                                "The two passphrases given do not match.",
 509                                "PuTTYgen Error",
 510                                MB_OK | MB_ICONERROR);
 511                     break;
 512                 }
 513                 if (!*passphrase) {
 514                     int ret;
 515                     ret = MessageBox(hwnd,
 516                                      "Are you sure you want to save this key\n"
 517                                      "without a passphrase to protect it?",
 518                                      "PuTTYgen Warning",
 519                                      MB_YESNO | MB_ICONWARNING);
 520                     if (ret != IDYES)
 521                         break;
 522                 }
 523                 if (prompt_keyfile(hwnd, "Save private key as:",
 524                                    filename, 1)) {
 525                     int ret;
 526                     FILE *fp = fopen(filename, "r");
 527                     if (fp) {
 528                         char buffer[FILENAME_MAX+80];
 529                         fclose(fp);
 530                         sprintf(buffer, "Overwrite existing file\n%.*s?",
 531                                 FILENAME_MAX, filename);
 532                         ret = MessageBox(hwnd, buffer, "PuTTYgen Warning",
 533                                          MB_YESNO | MB_ICONWARNING);
 534                         if (ret != IDYES)
 535                             break;
 536                     }
 537                     ret = saversakey(filename, &state->key, &state->aux,
 538                                      *passphrase ? passphrase : NULL);
 539                     if (ret <= 0) {
 540                         MessageBox(hwnd, "Unable to save key file",
 541                                    "PuTTYgen Error",
 542                                    MB_OK | MB_ICONERROR);
 543                     }
 544                 }
 545             }
 546             break;
 547           case IDC_LOAD:
 548             state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 549             if (!state->generation_thread_exists) {
 550                 char filename[FILENAME_MAX];
 551                 if (prompt_keyfile(hwnd, "Load private key:",
 552                                    filename, 0)) {
 553                     char passphrase[PASSPHRASE_MAXLEN];
 554                     int needs_pass;
 555                     int ret;
 556                     char *comment;
 557                     struct PassphraseProcStruct pps;
 558                     struct RSAKey newkey;
 559                     struct RSAAux newaux;
 560
 561                     needs_pass = rsakey_encrypted(filename, &comment);
 562                     pps.passphrase = passphrase;
 563                     pps.comment = comment;
 564                     do {
 565                         if (needs_pass) {
 566                             int dlgret;
 567                             dlgret = DialogBoxParam(hinst,
 568                                                     MAKEINTRESOURCE(210),
 569                                                     NULL, PassphraseProc,
 570                                                     (LPARAM)&pps);
 571                             if (!dlgret) {
 572                                 ret = -2;
 573                                 break;
 574                             }
 575                         } else
 576                             *passphrase = '\0';
 577                         ret = loadrsakey(filename, &newkey, &newaux,
 578                                          passphrase);
 579                     } while (ret == -1);
 580                     if (comment) free(comment);
 581                     if (ret == 0) {
 582                         MessageBox(NULL, "Couldn't load private key.",
 583                                    "PuTTYgen Error", MB_OK | MB_ICONERROR);
 584                     } else if (ret == 1) {
 585                         state->key = newkey;
 586                         state->aux = newaux;
 587
 588                         EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 1);
 589                         EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 1);
 590                         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 1);
 591                         /*
 592                          * Now update the key controls with all the
 593                          * key data.
 594                          */
 595                         {
 596                             char buf[128];
 597                             SetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT,
 598                                            passphrase);
 599                             SetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT,
 600                                            passphrase);
 601                             SetDlgItemText(hwnd, IDC_COMMENTEDIT,
 602                                            state->key.comment);
 603                             /*
 604                              * Set the key fingerprint.
 605                              */
 606                             {
 607                                 char *savecomment = state->key.comment;
 608                                 state->key.comment = NULL;
 609                                 rsa_fingerprint(buf, sizeof(buf), &state->key);
 610                                 state->key.comment = savecomment;
 611                             }
 612                             SetDlgItemText(hwnd, IDC_FINGERPRINT, buf);
 613                             /*
 614                              * Construct a decimal representation
 615                              * of the key, for pasting into
 616                              * .ssh/authorized_keys on a Unix box.
 617                              */
 618                             setupbigedit(hwnd, IDC_KEYDISPLAY, &state->key);
 619                         }
 620                         /*
 621                          * Finally, hide the progress bar and show
 622                          * the key data.
 623                          */
 624                         hidemany(hwnd, nokey_ids, TRUE);
 625                         hidemany(hwnd, generating_ids, TRUE);
 626                         hidemany(hwnd, gotkey_ids, FALSE);
 627                         state->key_exists = TRUE;
 628                     }
 629                 }
 630             }
 631             break;
 632         }
 633         return 0;
 634       case WM_DONEKEY:
 635         state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 636         state->generation_thread_exists = FALSE;
 637         state->key_exists = TRUE;
 638         SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, PROGRESSRANGE, 0);
 639         EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 1);
 640         EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 1);
 641         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 1);
 642         /*
 643          * Invent a comment for the key. We'll do this by including
 644          * the date in it. This will be so horrifyingly ugly that
 645          * the user will immediately want to change it, which is
 646          * what we want :-)
 647          */
 648         state->key.comment = malloc(30);
 649         {
 650             time_t t;
 651             struct tm *tm;
 652             time(&t);
 653             tm = localtime(&t);
 654             strftime(state->key.comment, 30, "rsa-key-%Y%m%d", tm);
 655         }
 656
 657         /*
 658          * Now update the key controls with all the key data.
 659          */
 660         {
 661             char buf[128];
 662             /*
 663              * Blank passphrase, initially. This isn't dangerous,
 664              * because we will warn (Are You Sure?) before allowing
 665              * the user to save an unprotected private key.
 666              */
 667             SetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT, "");
 668             SetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT, "");
 669             /*
 670              * Set the comment.
 671              */
 672             SetDlgItemText(hwnd, IDC_COMMENTEDIT, state->key.comment);
 673             /*
 674              * Set the key fingerprint.
 675              */
 676             {
 677                 char *savecomment = state->key.comment;
 678                 state->key.comment = NULL;
 679                 rsa_fingerprint(buf, sizeof(buf), &state->key);
 680                 state->key.comment = savecomment;
 681             }
 682             SetDlgItemText(hwnd, IDC_FINGERPRINT, buf);
 683             /*
 684              * Construct a decimal representation of the key, for
 685              * pasting into .ssh/authorized_keys on a Unix box.
 686              */
 687             setupbigedit(hwnd, IDC_KEYDISPLAY, &state->key);
 688         }
 689         /*
 690          * Finally, hide the progress bar and show the key data.
 691          */
 692         hidemany(hwnd, nokey_ids, TRUE);
 693         hidemany(hwnd, generating_ids, TRUE);
 694         hidemany(hwnd, gotkey_ids, FALSE);
 695         break;
 696       case WM_CLOSE:
 697         state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 698         free(state);
 699         EndDialog(hwnd, 1);
 700         return 0;
 701     }
 702     return 0;
 703 }
 704
 705 int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show) {
 706     InitCommonControls();
 707     hinst = inst;
 708     random_init();
 709     return DialogBox(hinst, MAKEINTRESOURCE(201), NULL, MainDlgProc) != IDOK;
 710 }