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