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  * TODO:
  25  *  - test the generated keys for actual working-RSA-key-hood
  26  */
  27
  28 /* ----------------------------------------------------------------------
  29  * Progress report code. This is really horrible :-)
  30  */
  31 #define PHASE1TOTAL 0x10000
  32 #define PHASE2TOTAL 0x10000
  33 #define PHASE3TOTAL 0x04000
  34 #define PHASE1START 0
  35 #define PHASE2START (PHASE1TOTAL)
  36 #define PHASE3START (PHASE1TOTAL + PHASE2TOTAL)
  37 #define TOTALTOTAL  (PHASE1TOTAL + PHASE2TOTAL + PHASE3TOTAL)
  38 #define PROGRESSBIGRANGE 65535
  39 #define DIVISOR     ((TOTALTOTAL + PROGRESSBIGRANGE - 1) / PROGRESSBIGRANGE)
  40 #define PROGRESSRANGE (TOTALTOTAL / DIVISOR)
  41 struct progress {
  42     unsigned phase1param, phase1current, phase1n;
  43     unsigned phase2param, phase2current, phase2n;
  44     unsigned phase3mult;
  45     HWND progbar;
  46 };
  47
  48 static void progress_update(void *param, int phase, int iprogress) {
  49     struct progress *p = (struct progress *)param;
  50     unsigned progress = iprogress;
  51     int position;
  52
  53     switch (phase) {
  54       case -1:
  55         p->phase1param = 0x10000 + progress;
  56         p->phase1current = 0x10000; p->phase1n = 0;
  57         return;
  58       case -2:
  59         p->phase2param = 0x10000 + progress;
  60         p->phase2current = 0x10000; p->phase2n = 0;
  61         return;
  62       case -3:
  63         p->phase3mult = PHASE3TOTAL / progress;
  64         return;
  65       case 1:
  66         while (p->phase1n < progress) {
  67             p->phase1n++;
  68             p->phase1current *= p->phase1param;
  69             p->phase1current /= 0x10000;
  70         }
  71         position = PHASE1START + 0x10000 - p->phase1current;
  72         break;
  73       case 2:
  74         while (p->phase2n < progress) {
  75             p->phase2n++;
  76             p->phase2current *= p->phase2param;
  77             p->phase2current /= 0x10000;
  78         }
  79         position = PHASE2START + 0x10000 - p->phase2current;
  80         break;
  81       case 3:
  82         position = PHASE3START + progress * p->phase3mult;
  83         break;
  84     }
  85
  86     SendMessage(p->progbar, PBM_SETPOS, position / DIVISOR, 0);
  87 }
  88
  89 extern char ver[];
  90
  91 #define PASSPHRASE_MAXLEN 512
  92
  93 struct PassphraseProcStruct {
  94     char *passphrase;
  95     char *comment;
  96 };
  97
  98 /*
  99  * Dialog-box function for the passphrase box.
 100  */
 101 static int CALLBACK PassphraseProc(HWND hwnd, UINT msg,
 102                                    WPARAM wParam, LPARAM lParam) {
 103     static char *passphrase;
 104     struct PassphraseProcStruct *p;
 105
 106     switch (msg) {
 107       case WM_INITDIALOG:
 108         SetForegroundWindow(hwnd);
 109         SetWindowPos (hwnd, HWND_TOP, 0, 0, 0, 0,
 110                       SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
 111         p = (struct PassphraseProcStruct *)lParam;
 112         passphrase = p->passphrase;
 113         if (p->comment)
 114             SetDlgItemText(hwnd, 101, p->comment);
 115         *passphrase = 0;
 116         return 0;
 117       case WM_COMMAND:
 118         switch (LOWORD(wParam)) {
 119           case IDOK:
 120             if (*passphrase)
 121                 EndDialog (hwnd, 1);
 122             else
 123                 MessageBeep (0);
 124             return 0;
 125           case IDCANCEL:
 126             EndDialog (hwnd, 0);
 127             return 0;
 128           case 102:                    /* edit box */
 129             if (HIWORD(wParam) == EN_CHANGE) {
 130                 GetDlgItemText (hwnd, 102, passphrase, PASSPHRASE_MAXLEN-1);
 131                 passphrase[PASSPHRASE_MAXLEN-1] = '\0';
 132             }
 133             return 0;
 134         }
 135         return 0;
 136       case WM_CLOSE:
 137         EndDialog (hwnd, 0);
 138         return 0;
 139     }
 140     return 0;
 141 }
 142
 143 /*
 144  * Prompt for a key file. Assumes the filename buffer is of size
 145  * FILENAME_MAX.
 146  */
 147 static int prompt_keyfile(HWND hwnd, char *dlgtitle,
 148                           char *filename, int save) {
 149     OPENFILENAME of;
 150     memset(&of, 0, sizeof(of));
 151 #ifdef OPENFILENAME_SIZE_VERSION_400
 152     of.lStructSize = OPENFILENAME_SIZE_VERSION_400;
 153 #else
 154     of.lStructSize = sizeof(of);
 155 #endif
 156     of.hwndOwner = hwnd;
 157     of.lpstrFilter = "All Files\0*\0\0\0";
 158     of.lpstrCustomFilter = NULL;
 159     of.nFilterIndex = 1;
 160     of.lpstrFile = filename; *filename = '\0';
 161     of.nMaxFile = FILENAME_MAX;
 162     of.lpstrFileTitle = NULL;
 163     of.lpstrInitialDir = NULL;
 164     of.lpstrTitle = dlgtitle;
 165     of.Flags = 0;
 166     if (save)
 167         return GetSaveFileName(&of);
 168     else
 169         return GetOpenFileName(&of);
 170 }
 171
 172 /*
 173  * This function is needed to link with the DES code. We need not
 174  * have it do anything at all.
 175  */
 176 void logevent(char *msg) {
 177 }
 178
 179 /*
 180  * Dialog-box function for the Licence box.
 181  */
 182 static int CALLBACK LicenceProc (HWND hwnd, UINT msg,
 183                                  WPARAM wParam, LPARAM lParam) {
 184     switch (msg) {
 185       case WM_INITDIALOG:
 186         return 1;
 187       case WM_COMMAND:
 188         switch (LOWORD(wParam)) {
 189           case IDOK:
 190             EndDialog(hwnd, 1);
 191             return 0;
 192         }
 193         return 0;
 194       case WM_CLOSE:
 195         EndDialog(hwnd, 1);
 196         return 0;
 197     }
 198     return 0;
 199 }
 200
 201 /*
 202  * Dialog-box function for the About box.
 203  */
 204 static int CALLBACK AboutProc (HWND hwnd, UINT msg,
 205                                WPARAM wParam, LPARAM lParam) {
 206     switch (msg) {
 207       case WM_INITDIALOG:
 208         SetDlgItemText (hwnd, 100, ver);
 209         return 1;
 210       case WM_COMMAND:
 211         switch (LOWORD(wParam)) {
 212           case IDOK:
 213             EndDialog(hwnd, 1);
 214             return 0;
 215           case 101:
 216             EnableWindow(hwnd, 0);
 217             DialogBox (hinst, MAKEINTRESOURCE(214), NULL, LicenceProc);
 218             EnableWindow(hwnd, 1);
 219             SetActiveWindow(hwnd);
 220             return 0;
 221         }
 222         return 0;
 223       case WM_CLOSE:
 224         EndDialog(hwnd, 1);
 225         return 0;
 226     }
 227     return 0;
 228 }
 229
 230 /*
 231  * Thread to generate a key.
 232  */
 233 struct rsa_key_thread_params {
 234     HWND progressbar;                  /* notify this with progress */
 235     HWND dialog;                       /* notify this on completion */
 236     int keysize;                       /* bits in key */
 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,
 247                  params->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     int keysize;
 261     unsigned *entropy;
 262     struct RSAKey key;
 263     struct RSAAux aux;
 264 };
 265
 266 static void hidemany(HWND hwnd, const int *ids, int hideit) {
 267     while (*ids) {
 268         ShowWindow(GetDlgItem(hwnd, *ids++), (hideit ? SW_HIDE : SW_SHOW));
 269     }
 270 }
 271
 272 static void setupbigedit(HWND hwnd, int id, struct RSAKey *key) {
 273     char *buffer;
 274     char *dec1, *dec2;
 275
 276     dec1 = bignum_decimal(key->exponent);
 277     dec2 = bignum_decimal(key->modulus);
 278     buffer = malloc(strlen(dec1)+strlen(dec2)+
 279                     strlen(key->comment)+30);
 280     sprintf(buffer, "%d %s %s %s",
 281             ssh1_bignum_bitcount(key->modulus),
 282             dec1, dec2, key->comment);
 283     SetDlgItemText(hwnd, id, buffer);
 284     free(dec1);
 285     free(dec2);
 286     free(buffer);
 287 }
 288
 289 /*
 290  * Dialog-box function for the main PuTTYgen dialog box.
 291  */
 292 static int CALLBACK MainDlgProc (HWND hwnd, UINT msg,
 293                                  WPARAM wParam, LPARAM lParam) {
 294     enum {
 295         controlidstart = 100,
 296         IDC_TITLE,
 297         IDC_BOX_KEY, IDC_BOXT_KEY,
 298         IDC_NOKEY,
 299         IDC_GENERATING,
 300         IDC_PROGRESS,
 301         IDC_PKSTATIC, IDC_KEYDISPLAY,
 302         IDC_FPSTATIC, IDC_FINGERPRINT,
 303         IDC_COMMENTSTATIC, IDC_COMMENTEDIT,
 304         IDC_PASSPHRASE1STATIC, IDC_PASSPHRASE1EDIT,
 305         IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT,
 306         IDC_BOX_ACTIONS, IDC_BOXT_ACTIONS,
 307         IDC_GENSTATIC, IDC_GENERATE,
 308         IDC_LOADSTATIC, IDC_LOAD,
 309         IDC_SAVESTATIC, IDC_SAVE,
 310         IDC_BOX_PARAMS, IDC_BOXT_PARAMS,
 311         IDC_BITSSTATIC, IDC_BITS,
 312         IDC_ABOUT,
 313     };
 314     static const int nokey_ids[] = { IDC_NOKEY, 0 };
 315     static const int generating_ids[] = { IDC_GENERATING, IDC_PROGRESS, 0 };
 316     static const int gotkey_ids[] = {
 317         IDC_PKSTATIC, IDC_KEYDISPLAY,
 318         IDC_FPSTATIC, IDC_FINGERPRINT,
 319         IDC_COMMENTSTATIC, IDC_COMMENTEDIT,
 320         IDC_PASSPHRASE1STATIC, IDC_PASSPHRASE1EDIT,
 321         IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT, 0 };
 322     static const char generating_msg[] =
 323         "Please wait while a key is generated...";
 324     static const char entropy_msg[] =
 325         "Please move the mouse in this window to generate randomness";
 326     struct MainDlgState *state;
 327
 328     switch (msg) {
 329       case WM_INITDIALOG:
 330         state = malloc(sizeof(*state));
 331         state->generation_thread_exists = FALSE;
 332         state->key_exists = FALSE;
 333         SetWindowLong(hwnd, GWL_USERDATA, (LONG)state);
 334         {
 335             struct ctlpos cp, cp2;
 336
 337             /* Accelerators used: acglops */
 338
 339             ctlposinit(&cp, hwnd, 10, 10, 10);
 340             bartitle(&cp, "Public and private key generation for PuTTY",
 341                     IDC_TITLE);
 342             beginbox(&cp, "Key",
 343                      IDC_BOX_KEY, IDC_BOXT_KEY);
 344             cp2 = cp;
 345             statictext(&cp2, "No key.", IDC_NOKEY);
 346             cp2 = cp;
 347             statictext(&cp2, "",
 348                        IDC_GENERATING);
 349             progressbar(&cp2, IDC_PROGRESS);
 350             bigeditctrl(&cp,
 351                         "&Public key for pasting into authorized_keys file:",
 352                         IDC_PKSTATIC, IDC_KEYDISPLAY, 7);
 353             SendDlgItemMessage(hwnd, IDC_KEYDISPLAY, EM_SETREADONLY, 1, 0);
 354             staticedit(&cp, "Key fingerprint:", IDC_FPSTATIC,
 355                        IDC_FINGERPRINT, 70);
 356             SendDlgItemMessage(hwnd, IDC_FINGERPRINT, EM_SETREADONLY, 1, 0);
 357             staticedit(&cp, "Key &comment:", IDC_COMMENTSTATIC,
 358                        IDC_COMMENTEDIT, 70);
 359             staticpassedit(&cp, "Key p&assphrase:", IDC_PASSPHRASE1STATIC,
 360                            IDC_PASSPHRASE1EDIT, 70);
 361             staticpassedit(&cp, "C&onfirm passphrase:", IDC_PASSPHRASE2STATIC,
 362                            IDC_PASSPHRASE2EDIT, 70);
 363             endbox(&cp);
 364             beginbox(&cp, "Actions",
 365                      IDC_BOX_ACTIONS, IDC_BOXT_ACTIONS);
 366             staticbtn(&cp, "Generate a public/private key pair",
 367                       IDC_GENSTATIC, "&Generate", IDC_GENERATE);
 368             staticbtn(&cp, "Load an existing private key file",
 369                       IDC_LOADSTATIC, "&Load", IDC_LOAD);
 370             staticbtn(&cp, "Save the generated key to a new file",
 371                       IDC_SAVESTATIC, "&Save", IDC_SAVE);
 372             endbox(&cp);
 373             beginbox(&cp, "Actions",
 374                      IDC_BOX_ACTIONS, IDC_BOXT_ACTIONS);
 375             staticedit(&cp, "Length of generated keys in &bits:",
 376                        IDC_BITSSTATIC, IDC_BITS, 20);
 377             endbox(&cp);
 378         }
 379         SetDlgItemInt(hwnd, IDC_BITS, DEFAULT_KEYSIZE, FALSE);
 380
 381         /*
 382          * Initially, hide the progress bar and the key display,
 383          * and show the no-key display. Also disable the Save
 384          * button, because with no key we obviously can't save
 385          * anything.
 386          */
 387         hidemany(hwnd, nokey_ids, FALSE);
 388         hidemany(hwnd, generating_ids, TRUE);
 389         hidemany(hwnd, gotkey_ids, TRUE);
 390         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 0);
 391
 392         return 1;
 393       case WM_MOUSEMOVE:
 394         state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 395         if (state->collecting_entropy) {
 396             state->entropy[state->entropy_got++] = lParam;
 397             state->entropy[state->entropy_got++] = GetMessageTime();
 398             SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS,
 399                                state->entropy_got, 0);
 400             if (state->entropy_got >= state->entropy_required) {
 401                 struct rsa_key_thread_params *params;
 402                 DWORD threadid;
 403
 404                 /*
 405                  * Seed the entropy pool
 406                  */
 407                 random_add_heavynoise(state->entropy, state->entropy_size);
 408                 memset(state->entropy, 0, state->entropy_size);
 409                 free(state->entropy);
 410
 411                 SetDlgItemText(hwnd, IDC_GENERATING, generating_msg);
 412                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
 413                                    MAKELPARAM(0, PROGRESSRANGE));
 414                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, 0, 0);
 415
 416                 params = malloc(sizeof(*params));
 417                 params->progressbar = GetDlgItem(hwnd, IDC_PROGRESS);
 418                 params->dialog = hwnd;
 419                 params->keysize = state->keysize;
 420                 params->key = &state->key;
 421                 params->aux = &state->aux;
 422
 423                 if (!CreateThread(NULL, 0, generate_rsa_key_thread,
 424                                   params, 0, &threadid)) {
 425                     MessageBox(hwnd, "Out of thread resources",
 426                                "Key generation error",
 427                                MB_OK | MB_ICONERROR);
 428                     free(params);
 429                 } else {
 430                     state->generation_thread_exists = TRUE;
 431                     state->collecting_entropy = FALSE;
 432                 }
 433             }
 434         }
 435         break;
 436       case WM_COMMAND:
 437         switch (LOWORD(wParam)) {
 438           case IDC_COMMENTEDIT:
 439             if (HIWORD(wParam) == EN_CHANGE) {
 440                 state = (struct MainDlgState *)
 441                     GetWindowLong(hwnd, GWL_USERDATA);
 442                 if (state->key_exists) {
 443                     HWND editctl = GetDlgItem(hwnd, IDC_COMMENTEDIT);
 444                     int len = GetWindowTextLength(editctl);
 445                     if (state->key.comment)
 446                         free(state->key.comment);
 447                     state->key.comment = malloc(len+1);
 448                     GetWindowText(editctl, state->key.comment, len+1);
 449                 }
 450             }
 451             break;
 452           case IDC_ABOUT:
 453             EnableWindow(hwnd, 0);
 454             DialogBox (hinst, MAKEINTRESOURCE(213), NULL, AboutProc);
 455             EnableWindow(hwnd, 1);
 456             SetActiveWindow(hwnd);
 457             return 0;
 458           case IDC_GENERATE:
 459             state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 460             if (!state->generation_thread_exists) {
 461                 hidemany(hwnd, nokey_ids, TRUE);
 462                 hidemany(hwnd, generating_ids, FALSE);
 463                 hidemany(hwnd, gotkey_ids, TRUE);
 464                 EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 0);
 465                 EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 0);
 466                 EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 0);
 467                 state->key_exists = FALSE;
 468                 SetDlgItemText(hwnd, IDC_GENERATING, entropy_msg);
 469                 state->collecting_entropy = TRUE;
 470                 {
 471                     BOOL ok;
 472                     state->keysize = GetDlgItemInt(hwnd, IDC_BITS,
 473                                                    &ok, FALSE);
 474                     if (!ok) state->keysize = DEFAULT_KEYSIZE;
 475                 }
 476
 477                 /*
 478                  * My brief statistical tests on mouse movements
 479                  * suggest that there are about 5 bits of
 480                  * randomness in the x position, 5 in the y
 481                  * position, and 1.7 in the message time, making
 482                  * 11.7 bits of unpredictability per mouse
 483                  * movement. However, other people have told me
 484                  * it's far less than that, so I'm going to be
 485                  * stupidly cautious and knock that down to a nice
 486                  * round 4.
 487                  */
 488                 state->entropy_required = (state->keysize / 4) * 2;
 489                 state->entropy_got = 0;
 490                 state->entropy_size = (state->entropy_required *
 491                                        sizeof(*state->entropy));
 492                 state->entropy = malloc(state->entropy_size);
 493
 494                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
 495                                    MAKELPARAM(0, state->entropy_required));
 496                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, 0, 0);
 497             }
 498             break;
 499           case IDC_SAVE:
 500             state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 501             if (state->key_exists) {
 502                 char filename[FILENAME_MAX];
 503                 char passphrase[PASSPHRASE_MAXLEN];
 504                 char passphrase2[PASSPHRASE_MAXLEN];
 505                 GetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT,
 506                                passphrase, sizeof(passphrase));
 507                 GetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT,
 508                                passphrase2, sizeof(passphrase2));
 509                 if (strcmp(passphrase, passphrase2)) {
 510                     MessageBox(hwnd,
 511                                "The two passphrases given do not match.",
 512                                "PuTTYgen Error",
 513                                MB_OK | MB_ICONERROR);
 514                     break;
 515                 }
 516                 if (!*passphrase) {
 517                     int ret;
 518                     ret = MessageBox(hwnd,
 519                                      "Are you sure you want to save this key\n"
 520                                      "without a passphrase to protect it?",
 521                                      "PuTTYgen Warning",
 522                                      MB_YESNO | MB_ICONWARNING);
 523                     if (ret != IDYES)
 524                         break;
 525                 }
 526                 if (prompt_keyfile(hwnd, "Save private key as:",
 527                                    filename, 1)) {
 528                     int ret;
 529                     FILE *fp = fopen(filename, "r");
 530                     if (fp) {
 531                         char buffer[FILENAME_MAX+80];
 532                         fclose(fp);
 533                         sprintf(buffer, "Overwrite existing file\n%.*s?",
 534                                 FILENAME_MAX, filename);
 535                         ret = MessageBox(hwnd, buffer, "PuTTYgen Warning",
 536                                          MB_YESNO | MB_ICONWARNING);
 537                         if (ret != IDYES)
 538                             break;
 539                     }
 540                     ret = saversakey(filename, &state->key, &state->aux,
 541                                      *passphrase ? passphrase : NULL);
 542                     if (ret <= 0) {
 543                         MessageBox(hwnd, "Unable to save key file",
 544                                    "PuTTYgen Error",
 545                                    MB_OK | MB_ICONERROR);
 546                     }
 547                 }
 548             }
 549             break;
 550           case IDC_LOAD:
 551             state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 552             if (!state->generation_thread_exists) {
 553                 char filename[FILENAME_MAX];
 554                 if (prompt_keyfile(hwnd, "Load private key:",
 555                                    filename, 0)) {
 556                     char passphrase[PASSPHRASE_MAXLEN];
 557                     int needs_pass;
 558                     int ret;
 559                     char *comment;
 560                     struct PassphraseProcStruct pps;
 561                     struct RSAKey newkey;
 562                     struct RSAAux newaux;
 563
 564                     needs_pass = rsakey_encrypted(filename, &comment);
 565                     pps.passphrase = passphrase;
 566                     pps.comment = comment;
 567                     do {
 568                         if (needs_pass) {
 569                             int dlgret;
 570                             dlgret = DialogBoxParam(hinst,
 571                                                     MAKEINTRESOURCE(210),
 572                                                     NULL, PassphraseProc,
 573                                                     (LPARAM)&pps);
 574                             if (!dlgret) {
 575                                 ret = -2;
 576                                 break;
 577                             }
 578                         } else
 579                             *passphrase = '\0';
 580                         ret = loadrsakey(filename, &newkey, &newaux,
 581                                          passphrase);
 582                     } while (ret == -1);
 583                     if (comment) free(comment);
 584                     if (ret == 0) {
 585                         MessageBox(NULL, "Couldn't load private key.",
 586                                    "PuTTYgen Error", MB_OK | MB_ICONERROR);
 587                     } else if (ret == 1) {
 588                         state->key = newkey;
 589                         state->aux = newaux;
 590
 591                         EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 1);
 592                         EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 1);
 593                         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 1);
 594                         /*
 595                          * Now update the key controls with all the
 596                          * key data.
 597                          */
 598                         {
 599                             char buf[128];
 600                             SetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT,
 601                                            passphrase);
 602                             SetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT,
 603                                            passphrase);
 604                             SetDlgItemText(hwnd, IDC_COMMENTEDIT,
 605                                            state->key.comment);
 606                             /*
 607                              * Set the key fingerprint.
 608                              */
 609                             {
 610                                 char *savecomment = state->key.comment;
 611                                 state->key.comment = NULL;
 612                                 rsa_fingerprint(buf, sizeof(buf), &state->key);
 613                                 state->key.comment = savecomment;
 614                             }
 615                             SetDlgItemText(hwnd, IDC_FINGERPRINT, buf);
 616                             /*
 617                              * Construct a decimal representation
 618                              * of the key, for pasting into
 619                              * .ssh/authorized_keys on a Unix box.
 620                              */
 621                             setupbigedit(hwnd, IDC_KEYDISPLAY, &state->key);
 622                         }
 623                         /*
 624                          * Finally, hide the progress bar and show
 625                          * the key data.
 626                          */
 627                         hidemany(hwnd, nokey_ids, TRUE);
 628                         hidemany(hwnd, generating_ids, TRUE);
 629                         hidemany(hwnd, gotkey_ids, FALSE);
 630                         state->key_exists = TRUE;
 631                     }
 632                 }
 633             }
 634             break;
 635         }
 636         return 0;
 637       case WM_DONEKEY:
 638         state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 639         state->generation_thread_exists = FALSE;
 640         state->key_exists = TRUE;
 641         SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, PROGRESSRANGE, 0);
 642         EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 1);
 643         EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 1);
 644         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 1);
 645         /*
 646          * Invent a comment for the key. We'll do this by including
 647          * the date in it. This will be so horrifyingly ugly that
 648          * the user will immediately want to change it, which is
 649          * what we want :-)
 650          */
 651         state->key.comment = malloc(30);
 652         {
 653             time_t t;
 654             struct tm *tm;
 655             time(&t);
 656             tm = localtime(&t);
 657             strftime(state->key.comment, 30, "rsa-key-%Y%m%d", tm);
 658         }
 659
 660         /*
 661          * Now update the key controls with all the key data.
 662          */
 663         {
 664             char buf[128];
 665             /*
 666              * Blank passphrase, initially. This isn't dangerous,
 667              * because we will warn (Are You Sure?) before allowing
 668              * the user to save an unprotected private key.
 669              */
 670             SetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT, "");
 671             SetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT, "");
 672             /*
 673              * Set the comment.
 674              */
 675             SetDlgItemText(hwnd, IDC_COMMENTEDIT, state->key.comment);
 676             /*
 677              * Set the key fingerprint.
 678              */
 679             {
 680                 char *savecomment = state->key.comment;
 681                 state->key.comment = NULL;
 682                 rsa_fingerprint(buf, sizeof(buf), &state->key);
 683                 state->key.comment = savecomment;
 684             }
 685             SetDlgItemText(hwnd, IDC_FINGERPRINT, buf);
 686             /*
 687              * Construct a decimal representation of the key, for
 688              * pasting into .ssh/authorized_keys on a Unix box.
 689              */
 690             setupbigedit(hwnd, IDC_KEYDISPLAY, &state->key);
 691         }
 692         /*
 693          * Finally, hide the progress bar and show the key data.
 694          */
 695         hidemany(hwnd, nokey_ids, TRUE);
 696         hidemany(hwnd, generating_ids, TRUE);
 697         hidemany(hwnd, gotkey_ids, FALSE);
 698         break;
 699       case WM_CLOSE:
 700         state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
 701         free(state);
 702         EndDialog(hwnd, 1);
 703         return 0;
 704     }
 705     return 0;
 706 }
 707
 708 int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show) {
 709     InitCommonControls();
 710     hinst = inst;
 711     random_init();
 712     return DialogBox(hinst, MAKEINTRESOURCE(201), NULL, MainDlgProc) != IDOK;
 713 }