puttygen.c

   1 /*
   2  * PuTTY key generation front end.
   3  */
   4
   5 #include <windows.h>
   6 #include <commctrl.h>
   7 #include <time.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10
  11 #define PUTTY_DO_GLOBALS
  12
  13 #include "putty.h"
  14 #include "ssh.h"
  15 #include "winstuff.h"
  16
  17 #define WM_DONEKEY (WM_XUSER + 1)
  18
  19 #define DEFAULT_KEYSIZE 1024
  20
  21 /* ----------------------------------------------------------------------
  22  * Progress report code. This is really horrible :-)
  23  */
  24 #define PHASE1TOTAL 0x10000
  25 #define PHASE2TOTAL 0x10000
  26 #define PHASE3TOTAL 0x04000
  27 #define PHASE1START 0
  28 #define PHASE2START (PHASE1TOTAL)
  29 #define PHASE3START (PHASE1TOTAL + PHASE2TOTAL)
  30 #define TOTALTOTAL  (PHASE1TOTAL + PHASE2TOTAL + PHASE3TOTAL)
  31 #define PROGRESSBIGRANGE 65535
  32 #define DIVISOR     ((TOTALTOTAL + PROGRESSBIGRANGE - 1) / PROGRESSBIGRANGE)
  33 #define PROGRESSRANGE (TOTALTOTAL / DIVISOR)
  34 struct progress {
  35     unsigned phase1param, phase1current, phase1n;
  36     unsigned phase2param, phase2current, phase2n;
  37     unsigned phase3mult;
  38     HWND progbar;
  39 };
  40
  41 static void progress_update(void *param, int phase, int iprogress) {
  42     struct progress *p = (struct progress *)param;
  43     unsigned progress = iprogress;
  44     int position;
  45
  46     switch (phase) {
  47       case -1:
  48         p->phase1param = 0x10000 + progress;
  49         p->phase1current = 0x10000; p->phase1n = 0;
  50         return;
  51       case -2:
  52         p->phase2param = 0x10000 + progress;
  53         p->phase2current = 0x10000; p->phase2n = 0;
  54         return;
  55       case -3:
  56         p->phase3mult = PHASE3TOTAL / progress;
  57         return;
  58       case 1:
  59         while (p->phase1n < progress) {
  60             p->phase1n++;
  61             p->phase1current *= p->phase1param;
  62             p->phase1current /= 0x10000;
  63         }
  64         position = PHASE1START + 0x10000 - p->phase1current;
  65         break;
  66       case 2:
  67         while (p->phase2n < progress) {
  68             p->phase2n++;
  69             p->phase2current *= p->phase2param;
  70             p->phase2current /= 0x10000;
  71         }
  72         position = PHASE2START + 0x10000 - p->phase2current;
  73         break;
  74       case 3:
  75         position = PHASE3START + progress * p->phase3mult;
  76         break;
  77     }
  78
  79     SendMessage(p->progbar, PBM_SETPOS, position / DIVISOR, 0);
  80 }
  81
  82 extern char ver[];
  83
  84 #define PASSPHRASE_MAXLEN 512
  85
  86 struct PassphraseProcStruct {
  87     char *passphrase;
  88     char *comment;
  89 };
  90
  91 /*
  92  * Dialog-box function for the passphrase box.
  93  */
  94 static int CALLBACK PassphraseProc(HWND hwnd, UINT msg,
  95                                    WPARAM wParam, LPARAM lParam) {
  96     static char *passphrase;
  97     struct PassphraseProcStruct *p;
  98
  99     switch (msg) {
 100       case WM_INITDIALOG:
 101         SetForegroundWindow(hwnd);
 102         SetWindowPos (hwnd, HWND_TOP, 0, 0, 0, 0,
 103                       SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
 104         p = (struct PassphraseProcStruct *)lParam;
 105         passphrase = p->passphrase;
 106         if (p->comment)
 107             SetDlgItemText(hwnd, 101, p->comment);
 108         *passphrase = 0;
 109         return 0;
 110       case WM_COMMAND:
 111         switch (LOWORD(wParam)) {
 112           case IDOK:
 113             if (*passphrase)
 114                 EndDialog (hwnd, 1);
 115             else
 116                 MessageBeep (0);
 117             return 0;
 118           case IDCANCEL:
 119             EndDialog (hwnd, 0);
 120             return 0;
 121           case 102:                    /* edit box */
 122             if (HIWORD(wParam) == EN_CHANGE) {
 123                 GetDlgItemText (hwnd, 102, passphrase, PASSPHRASE_MAXLEN-1);
 124                 passphrase[PASSPHRASE_MAXLEN-1] = '\0';
 125             }
 126             return 0;
 127         }
 128         return 0;
 129       case WM_CLOSE:
 130         EndDialog (hwnd, 0);
 131         return 0;
 132     }
 133     return 0;
 134 }
 135
 136 /*
 137  * Prompt for a key file. Assumes the filename buffer is of size
 138  * FILENAME_MAX.
 139  */
 140 static int prompt_keyfile(HWND hwnd, char *dlgtitle,
 141                           char *filename, int save) {
 142     OPENFILENAME of;
 143     memset(&of, 0, sizeof(of));
 144 #ifdef OPENFILENAME_SIZE_VERSION_400
 145     of.lStructSize = OPENFILENAME_SIZE_VERSION_400;
 146 #else
 147     of.lStructSize = sizeof(of);
 148 #endif
 149     of.hwndOwner = hwnd;
 150     of.lpstrFilter = "All Files\0*\0\0\0";
 151     of.lpstrCustomFilter = NULL;
 152     of.nFilterIndex = 1;
 153     of.lpstrFile = filename; *filename = '\0';
 154     of.nMaxFile = FILENAME_MAX;
 155     of.lpstrFileTitle = NULL;
 156     of.lpstrInitialDir = NULL;
 157     of.lpstrTitle = dlgtitle;
 158     of.Flags = 0;
 159     if (save)
 160         return GetSaveFileName(&of);
 161     else
 162         return GetOpenFileName(&of);
 163 }
 164
 165 /*
 166  * This function is needed to link with the DES code. We need not
 167  * have it do anything at all.
 168  */
 169 void logevent(char *msg) {
 170 }
 171
 172 /*
 173  * Dialog-box function for the Licence box.
 174  */
 175 static int CALLBACK LicenceProc (HWND hwnd, UINT msg,
 176                                  WPARAM wParam, LPARAM lParam) {
 177     switch (msg) {
 178       case WM_INITDIALOG:
 179         return 1;
 180       case WM_COMMAND:
 181         switch (LOWORD(wParam)) {
 182           case IDOK:
 183             EndDialog(hwnd, 1);
 184             return 0;
 185         }
 186         return 0;
 187       case WM_CLOSE:
 188         EndDialog(hwnd, 1);
 189         return 0;
 190     }
 191     return 0;
 192 }
 193
 194 /*
 195  * Dialog-box function for the About box.
 196  */
 197 static int CALLBACK AboutProc (HWND hwnd, UINT msg,
 198                                WPARAM wParam, LPARAM lParam) {
 199     switch (msg) {
 200       case WM_INITDIALOG:
 201         SetDlgItemText (hwnd, 100, ver);
 202         return 1;
 203       case WM_COMMAND:
 204         switch (LOWORD(wParam)) {
 205           case IDOK:
 206             EndDialog(hwnd, 1);
 207             return 0;
 208           case 101:
 209             EnableWindow(hwnd, 0);
 210             DialogBox (hinst, MAKEINTRESOURCE(214), NULL, LicenceProc);
 211             EnableWindow(hwnd, 1);
 212             SetActiveWindow(hwnd);
 213             return 0;
 214         }
 215         return 0;
 216       case WM_CLOSE:
 217         EndDialog(hwnd, 1);
 218         return 0;
 219     }
 220     return 0;
 221 }
 222
 223 /*
 224  * Thread to generate a key.
 225  */
 226 struct rsa_key_thread_params {
 227     HWND progressbar;                  /* notify this with progress */
 228     HWND dialog;                       /* notify this on completion */
 229     int keysize;                       /* bits in key */
 230     struct RSAKey *key;
 231     struct RSAAux *aux;
 232 };
 233 static DWORD WINAPI generate_rsa_key_thread(void *param) {
 234     struct rsa_key_thread_params *params =
 235         (struct rsa_key_thread_params *)param;
 236     struct progress prog;
 237     prog.progbar = params->progressbar;
 238
 239     rsa_generate(params->key, params->aux,
 240                  params->keysize, progress_update, &prog);
 241
 242     PostMessage(params->dialog, WM_DONEKEY, 0, 0);
 243
 244     sfree(params);
 245     return 0;
 246 }
 247
 248 struct MainDlgState {
 249     int collecting_entropy;
 250     int generation_thread_exists;
 251     int key_exists;
 252     int entropy_got, entropy_required, entropy_size;
 253     int keysize;
 254     unsigned *entropy;
 255     struct RSAKey key;
 256     struct RSAAux aux;
 257 };
 258
 259 static void hidemany(HWND hwnd, const int *ids, int hideit) {
 260     while (*ids) {
 261         ShowWindow(GetDlgItem(hwnd, *ids++), (hideit ? SW_HIDE : SW_SHOW));
 262     }
 263 }
 264
 265 static void setupbigedit(HWND hwnd, int id, struct RSAKey *key) {
 266     char *buffer;
 267     char *dec1, *dec2;
 268
 269     dec1 = bignum_decimal(key->exponent);
 270     dec2 = bignum_decimal(key->modulus);
 271     buffer = smalloc(strlen(dec1)+strlen(dec2)+
 272                      strlen(key->comment)+30);
 273     sprintf(buffer, "%d %s %s %s",
 274             ssh1_bignum_bitcount(key->modulus),
 275             dec1, dec2, key->comment);
 276     SetDlgItemText(hwnd, id, buffer);
 277     sfree(dec1);
 278     sfree(dec2);
 279     sfree(buffer);
 280 }
 281
 282 /*
 283  * Dialog-box function for the main PuTTYgen dialog box.
 284  */
 285 static int CALLBACK MainDlgProc (HWND hwnd, UINT msg,
 286                                  WPARAM wParam, LPARAM lParam) {
 287     enum {
 288         controlidstart = 100,
 289         IDC_TITLE,
 290         IDC_BOX_KEY, IDC_BOXT_KEY,
 291         IDC_NOKEY,
 292         IDC_GENERATING,
 293         IDC_PROGRESS,
 294         IDC_PKSTATIC, IDC_KEYDISPLAY,
 295         IDC_FPSTATIC, IDC_FINGERPRINT,
 296         IDC_COMMENTSTATIC, IDC_COMMENTEDIT,
 297         IDC_PASSPHRASE1STATIC, IDC_PASSPHRASE1EDIT,
 298         IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT,
 299         IDC_BOX_ACTIONS, IDC_BOXT_ACTIONS,
 300         IDC_GENSTATIC, IDC_GENERATE,
 301         IDC_LOADSTATIC, IDC_LOAD,
 302         IDC_SAVESTATIC, IDC_SAVE,
 303         IDC_BOX_PARAMS, IDC_BOXT_PARAMS,
 304         IDC_BITSSTATIC, IDC_BITS,
 305         IDC_ABOUT,
 306     };
 307     static const int nokey_ids[] = { IDC_NOKEY, 0 };
 308     static const int generating_ids[] = { IDC_GENERATING, IDC_PROGRESS, 0 };
 309     static const int gotkey_ids[] = {
 310         IDC_PKSTATIC, IDC_KEYDISPLAY,
 311         IDC_FPSTATIC, IDC_FINGERPRINT,
 312         IDC_COMMENTSTATIC, IDC_COMMENTEDIT,
 313         IDC_PASSPHRASE1STATIC, IDC_PASSPHRASE1EDIT,
 314         IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT, 0 };
 315     static const char generating_msg[] =
 316         "Please wait while a key is generated...";
 317     static const char entropy_msg[] =
 318         "Please generate some randomness by moving the mouse over the blank area.";
 319     struct MainDlgState *state;
 320
 321     switch (msg) {
 322       case WM_INITDIALOG:
 323         state = smalloc(sizeof(*state));
 324         state->generation_thread_exists = FALSE;
 325         state->collecting_entropy = FALSE;
 326         state->entropy = NULL;
 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, "Parameters",
 369                      IDC_BOX_PARAMS, IDC_BOXT_PARAMS);
 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 &&
 392             state->entropy_got < state->entropy_required) {
 393             state->entropy[state->entropy_got++] = lParam;
 394             state->entropy[state->entropy_got++] = GetMessageTime();
 395             SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS,
 396                                state->entropy_got, 0);
 397             if (state->entropy_got >= state->entropy_required) {
 398                 struct rsa_key_thread_params *params;
 399                 DWORD threadid;
 400
 401                 /*
 402                  * Seed the entropy pool
 403                  */
 404                 random_add_heavynoise(state->entropy, state->entropy_size);
 405                 memset(state->entropy, 0, state->entropy_size);
 406                 sfree(state->entropy);
 407                 state->collecting_entropy = FALSE;
 408
 409                 SetDlgItemText(hwnd, IDC_GENERATING, generating_msg);
 410                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
 411                                    MAKELPARAM(0, PROGRESSRANGE));
 412                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, 0, 0);
 413
 414                 params = smalloc(sizeof(*params));
 415                 params->progressbar = GetDlgItem(hwnd, IDC_PROGRESS);
 416                 params->dialog = hwnd;
 417                 params->keysize = state->keysize;
 418                 params->key = &state->key;
 419                 params->aux = &state->aux;
 420
 421                 if (!CreateThread(NULL, 0, generate_rsa_key_thread,
 422                                   params, 0, &threadid)) {
 423                     MessageBox(hwnd, "Out of thread resources",
 424                                "Key generation error",
 425                                MB_OK | MB_ICONERROR);
 426                     sfree(params);
 427                 } else {
 428                     state->generation_thread_exists = TRUE;
 429                 }
 430             }
 431         }
 432         break;
 433       case WM_COMMAND:
 434         switch (LOWORD(wParam)) {
 435           case IDC_COMMENTEDIT:
 436             if (HIWORD(wParam) == EN_CHANGE) {
 437                 state = (struct MainDlgState *)
 438                     GetWindowLong(hwnd, GWL_USERDATA);
 439                 if (state->key_exists) {
 440                     HWND editctl = GetDlgItem(hwnd, IDC_COMMENTEDIT);
 441                     int len = GetWindowTextLength(editctl);
 442                     if (state->key.comment)
 443                         sfree(state->key.comment);
 444                     state->key.comment = smalloc(len+1);
 445                     GetWindowText(editctl, state->key.comment, len+1);
 446                 }
 447             }
 448             break;
 449           case IDC_ABOUT:
 450             EnableWindow(hwnd, 0);
 451             DialogBox (hinst, MAKEINTRESOURCE(213), NULL, AboutProc);
 452             EnableWindow(hwnd, 1);
 453             SetActiveWindow(hwnd);
 454             return 0;
 455           case IDC_GENERATE:
 456             state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 457             if (!state->generation_thread_exists) {
 458                 BOOL ok;
 459                 state->keysize = GetDlgItemInt(hwnd, IDC_BITS,
 460                                                &ok, FALSE);
 461                 if (!ok) state->keysize = DEFAULT_KEYSIZE;
 462                 if (state->keysize < 256) {
 463                     int ret = MessageBox(hwnd,
 464                                          "PuTTYgen will not generate a key"
 465                                          " smaller than 256 bits.\n"
 466                                          "Key length reset to 256. Continue?",
 467                                          "PuTTYgen Warning",
 468                                          MB_ICONWARNING | MB_OKCANCEL);
 469                     if (ret != IDOK)
 470                         break;
 471                     state->keysize = 256;
 472                     SetDlgItemInt(hwnd, IDC_BITS, 256, FALSE);
 473                 }
 474                 hidemany(hwnd, nokey_ids, TRUE);
 475                 hidemany(hwnd, generating_ids, FALSE);
 476                 hidemany(hwnd, gotkey_ids, TRUE);
 477                 EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 0);
 478                 EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 0);
 479                 EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 0);
 480                 state->key_exists = FALSE;
 481                 SetDlgItemText(hwnd, IDC_GENERATING, entropy_msg);
 482                 state->collecting_entropy = TRUE;
 483
 484                 /*
 485                  * My brief statistical tests on mouse movements
 486                  * suggest that there are about 2.5 bits of
 487                  * randomness in the x position, 2.5 in the y
 488                  * position, and 1.7 in the message time, making
 489                  * 5.7 bits of unpredictability per mouse movement.
 490                  * However, other people have told me it's far less
 491                  * than that, so I'm going to be stupidly cautious
 492                  * and knock that down to a nice round 2. With this
 493                  * method, we require two words per mouse movement,
 494                  * so with 2 bits per mouse movement we expect 2
 495                  * bits every 2 words.
 496                  */
 497                 state->entropy_required = (state->keysize/2) * 2;
 498                 state->entropy_got = 0;
 499                 state->entropy_size = (state->entropy_required *
 500                                        sizeof(*state->entropy));
 501                 state->entropy = smalloc(state->entropy_size);
 502
 503                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
 504                                    MAKELPARAM(0, state->entropy_required));
 505                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, 0, 0);
 506             }
 507             break;
 508           case IDC_SAVE:
 509             state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 510             if (state->key_exists) {
 511                 char filename[FILENAME_MAX];
 512                 char passphrase[PASSPHRASE_MAXLEN];
 513                 char passphrase2[PASSPHRASE_MAXLEN];
 514                 GetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT,
 515                                passphrase, sizeof(passphrase));
 516                 GetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT,
 517                                passphrase2, sizeof(passphrase2));
 518                 if (strcmp(passphrase, passphrase2)) {
 519                     MessageBox(hwnd,
 520                                "The two passphrases given do not match.",
 521                                "PuTTYgen Error",
 522                                MB_OK | MB_ICONERROR);
 523                     break;
 524                 }
 525                 if (!*passphrase) {
 526                     int ret;
 527                     ret = MessageBox(hwnd,
 528                                      "Are you sure you want to save this key\n"
 529                                      "without a passphrase to protect it?",
 530                                      "PuTTYgen Warning",
 531                                      MB_YESNO | MB_ICONWARNING);
 532                     if (ret != IDYES)
 533                         break;
 534                 }
 535                 if (prompt_keyfile(hwnd, "Save private key as:",
 536                                    filename, 1)) {
 537                     int ret;
 538                     FILE *fp = fopen(filename, "r");
 539                     if (fp) {
 540                         char buffer[FILENAME_MAX+80];
 541                         fclose(fp);
 542                         sprintf(buffer, "Overwrite existing file\n%.*s?",
 543                                 FILENAME_MAX, filename);
 544                         ret = MessageBox(hwnd, buffer, "PuTTYgen Warning",
 545                                          MB_YESNO | MB_ICONWARNING);
 546                         if (ret != IDYES)
 547                             break;
 548                     }
 549                     ret = saversakey(filename, &state->key, &state->aux,
 550                                      *passphrase ? passphrase : NULL);
 551                     if (ret <= 0) {
 552                         MessageBox(hwnd, "Unable to save key file",
 553                                    "PuTTYgen Error",
 554                                    MB_OK | MB_ICONERROR);
 555                     }
 556                 }
 557             }
 558             break;
 559           case IDC_LOAD:
 560             state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 561             if (!state->generation_thread_exists) {
 562                 char filename[FILENAME_MAX];
 563                 if (prompt_keyfile(hwnd, "Load private key:",
 564                                    filename, 0)) {
 565                     char passphrase[PASSPHRASE_MAXLEN];
 566                     int needs_pass;
 567                     int ret;
 568                     char *comment;
 569                     struct PassphraseProcStruct pps;
 570                     struct RSAKey newkey;
 571                     struct RSAAux newaux;
 572
 573                     needs_pass = rsakey_encrypted(filename, &comment);
 574                     pps.passphrase = passphrase;
 575                     pps.comment = comment;
 576                     do {
 577                         if (needs_pass) {
 578                             int dlgret;
 579                             dlgret = DialogBoxParam(hinst,
 580                                                     MAKEINTRESOURCE(210),
 581                                                     NULL, PassphraseProc,
 582                                                     (LPARAM)&pps);
 583                             if (!dlgret) {
 584                                 ret = -2;
 585                                 break;
 586                             }
 587                         } else
 588                             *passphrase = '\0';
 589                         ret = loadrsakey(filename, &newkey, &newaux,
 590                                          passphrase);
 591                     } while (ret == -1);
 592                     if (comment) sfree(comment);
 593                     if (ret == 0) {
 594                         MessageBox(NULL, "Couldn't load private key.",
 595                                    "PuTTYgen Error", MB_OK | MB_ICONERROR);
 596                     } else if (ret == 1) {
 597                         state->key = newkey;
 598                         state->aux = newaux;
 599
 600                         EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 1);
 601                         EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 1);
 602                         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 1);
 603                         /*
 604                          * Now update the key controls with all the
 605                          * key data.
 606                          */
 607                         {
 608                             char buf[128];
 609                             SetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT,
 610                                            passphrase);
 611                             SetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT,
 612                                            passphrase);
 613                             SetDlgItemText(hwnd, IDC_COMMENTEDIT,
 614                                            state->key.comment);
 615                             /*
 616                              * Set the key fingerprint.
 617                              */
 618                             {
 619                                 char *savecomment = state->key.comment;
 620                                 state->key.comment = NULL;
 621                                 rsa_fingerprint(buf, sizeof(buf), &state->key);
 622                                 state->key.comment = savecomment;
 623                             }
 624                             SetDlgItemText(hwnd, IDC_FINGERPRINT, buf);
 625                             /*
 626                              * Construct a decimal representation
 627                              * of the key, for pasting into
 628                              * .ssh/authorized_keys on a Unix box.
 629                              */
 630                             setupbigedit(hwnd, IDC_KEYDISPLAY, &state->key);
 631                         }
 632                         /*
 633                          * Finally, hide the progress bar and show
 634                          * the key data.
 635                          */
 636                         hidemany(hwnd, nokey_ids, TRUE);
 637                         hidemany(hwnd, generating_ids, TRUE);
 638                         hidemany(hwnd, gotkey_ids, FALSE);
 639                         state->key_exists = TRUE;
 640                     }
 641                 }
 642             }
 643             break;
 644         }
 645         return 0;
 646       case WM_DONEKEY:
 647         state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 648         state->generation_thread_exists = FALSE;
 649         state->key_exists = TRUE;
 650         SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, PROGRESSRANGE, 0);
 651         EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 1);
 652         EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 1);
 653         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 1);
 654         /*
 655          * Invent a comment for the key. We'll do this by including
 656          * the date in it. This will be so horrifyingly ugly that
 657          * the user will immediately want to change it, which is
 658          * what we want :-)
 659          */
 660         state->key.comment = smalloc(30);
 661         {
 662             time_t t;
 663             struct tm *tm;
 664             time(&t);
 665             tm = localtime(&t);
 666             strftime(state->key.comment, 30, "rsa-key-%Y%m%d", tm);
 667         }
 668
 669         /*
 670          * Now update the key controls with all the key data.
 671          */
 672         {
 673             char buf[128];
 674             /*
 675              * Blank passphrase, initially. This isn't dangerous,
 676              * because we will warn (Are You Sure?) before allowing
 677              * the user to save an unprotected private key.
 678              */
 679             SetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT, "");
 680             SetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT, "");
 681             /*
 682              * Set the comment.
 683              */
 684             SetDlgItemText(hwnd, IDC_COMMENTEDIT, state->key.comment);
 685             /*
 686              * Set the key fingerprint.
 687              */
 688             {
 689                 char *savecomment = state->key.comment;
 690                 state->key.comment = NULL;
 691                 rsa_fingerprint(buf, sizeof(buf), &state->key);
 692                 state->key.comment = savecomment;
 693             }
 694             SetDlgItemText(hwnd, IDC_FINGERPRINT, buf);
 695             /*
 696              * Construct a decimal representation of the key, for
 697              * pasting into .ssh/authorized_keys on a Unix box.
 698              */
 699             setupbigedit(hwnd, IDC_KEYDISPLAY, &state->key);
 700         }
 701         /*
 702          * Finally, hide the progress bar and show the key data.
 703          */
 704         hidemany(hwnd, nokey_ids, TRUE);
 705         hidemany(hwnd, generating_ids, TRUE);
 706         hidemany(hwnd, gotkey_ids, FALSE);
 707         break;
 708       case WM_CLOSE:
 709         state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 710         sfree(state);
 711         EndDialog(hwnd, 1);
 712         return 0;
 713     }
 714     return 0;
 715 }
 716
 717 int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show) {
 718     InitCommonControls();
 719     hinst = inst;
 720     random_init();
 721     return DialogBox(hinst, MAKEINTRESOURCE(201), NULL, MainDlgProc) != IDOK;
 722 }