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 {
  43     struct progress *p = (struct progress *) param;
  44     unsigned progress = iprogress;
  45     int position;
  46
  47     switch (phase) {
  48       case -1:
  49         p->phase1param = 0x10000 + progress;
  50         p->phase1current = 0x10000;
  51         p->phase1n = 0;
  52         return;
  53       case -2:
  54         p->phase2param = 0x10000 + progress;
  55         p->phase2current = 0x10000;
  56         p->phase2n = 0;
  57         return;
  58       case -3:
  59         p->phase3mult = PHASE3TOTAL / progress;
  60         return;
  61       case 1:
  62         while (p->phase1n < progress) {
  63             p->phase1n++;
  64             p->phase1current *= p->phase1param;
  65             p->phase1current /= 0x10000;
  66         }
  67         position = PHASE1START + 0x10000 - p->phase1current;
  68         break;
  69       case 2:
  70         while (p->phase2n < progress) {
  71             p->phase2n++;
  72             p->phase2current *= p->phase2param;
  73             p->phase2current /= 0x10000;
  74         }
  75         position = PHASE2START + 0x10000 - p->phase2current;
  76         break;
  77       case 3:
  78         position = PHASE3START + progress * p->phase3mult;
  79         break;
  80       default:
  81         /*
  82          * Shouldn't happen, but having a default clause placates
  83          * gcc -Wall, which would otherwise complain that
  84          * `position' might be used uninitialised.
  85          */
  86         return;
  87     }
  88
  89     SendMessage(p->progbar, PBM_SETPOS, position / DIVISOR, 0);
  90 }
  91
  92 extern char ver[];
  93
  94 #define PASSPHRASE_MAXLEN 512
  95
  96 struct PassphraseProcStruct {
  97     char *passphrase;
  98     char *comment;
  99 };
 100
 101 /*
 102  * Dialog-box function for the passphrase box.
 103  */
 104 static int CALLBACK PassphraseProc(HWND hwnd, UINT msg,
 105                                    WPARAM wParam, LPARAM lParam)
 106 {
 107     static char *passphrase = NULL;
 108     struct PassphraseProcStruct *p;
 109
 110     switch (msg) {
 111       case WM_INITDIALOG:
 112         SetForegroundWindow(hwnd);
 113         SetWindowPos(hwnd, HWND_TOP, 0, 0, 0, 0,
 114                      SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
 115
 116         /*
 117          * Centre the window.
 118          */
 119         {                              /* centre the window */
 120             RECT rs, rd;
 121             HWND hw;
 122
 123             hw = GetDesktopWindow();
 124             if (GetWindowRect(hw, &rs) && GetWindowRect(hwnd, &rd))
 125                 MoveWindow(hwnd,
 126                            (rs.right + rs.left + rd.left - rd.right) / 2,
 127                            (rs.bottom + rs.top + rd.top - rd.bottom) / 2,
 128                            rd.right - rd.left, rd.bottom - rd.top, TRUE);
 129         }
 130
 131         p = (struct PassphraseProcStruct *) lParam;
 132         passphrase = p->passphrase;
 133         if (p->comment)
 134             SetDlgItemText(hwnd, 101, p->comment);
 135         *passphrase = 0;
 136         SetDlgItemText(hwnd, 102, passphrase);
 137         return 0;
 138       case WM_COMMAND:
 139         switch (LOWORD(wParam)) {
 140           case IDOK:
 141             if (*passphrase)
 142                 EndDialog(hwnd, 1);
 143             else
 144                 MessageBeep(0);
 145             return 0;
 146           case IDCANCEL:
 147             EndDialog(hwnd, 0);
 148             return 0;
 149           case 102:                    /* edit box */
 150             if ((HIWORD(wParam) == EN_CHANGE) && passphrase) {
 151                 GetDlgItemText(hwnd, 102, passphrase,
 152                                PASSPHRASE_MAXLEN - 1);
 153                 passphrase[PASSPHRASE_MAXLEN - 1] = '\0';
 154             }
 155             return 0;
 156         }
 157         return 0;
 158       case WM_CLOSE:
 159         EndDialog(hwnd, 0);
 160         return 0;
 161     }
 162     return 0;
 163 }
 164
 165 /*
 166  * Prompt for a key file. Assumes the filename buffer is of size
 167  * FILENAME_MAX.
 168  */
 169 static int prompt_keyfile(HWND hwnd, char *dlgtitle,
 170                           char *filename, int save)
 171 {
 172     OPENFILENAME of;
 173     memset(&of, 0, sizeof(of));
 174 #ifdef OPENFILENAME_SIZE_VERSION_400
 175     of.lStructSize = OPENFILENAME_SIZE_VERSION_400;
 176 #else
 177     of.lStructSize = sizeof(of);
 178 #endif
 179     of.hwndOwner = hwnd;
 180     of.lpstrFilter = "All Files\0*\0\0\0";
 181     of.lpstrCustomFilter = NULL;
 182     of.nFilterIndex = 1;
 183     of.lpstrFile = filename;
 184     *filename = '\0';
 185     of.nMaxFile = FILENAME_MAX;
 186     of.lpstrFileTitle = NULL;
 187     of.lpstrInitialDir = NULL;
 188     of.lpstrTitle = dlgtitle;
 189     of.Flags = 0;
 190     if (save)
 191         return GetSaveFileName(&of);
 192     else
 193         return GetOpenFileName(&of);
 194 }
 195
 196 /*
 197  * This function is needed to link with the DES code. We need not
 198  * have it do anything at all.
 199  */
 200 void logevent(char *msg)
 201 {
 202 }
 203
 204 /*
 205  * Dialog-box function for the Licence box.
 206  */
 207 static int CALLBACK LicenceProc(HWND hwnd, UINT msg,
 208                                 WPARAM wParam, LPARAM lParam)
 209 {
 210     switch (msg) {
 211       case WM_INITDIALOG:
 212         /*
 213          * Centre the window.
 214          */
 215         {                              /* centre the window */
 216             RECT rs, rd;
 217             HWND hw;
 218
 219             hw = GetDesktopWindow();
 220             if (GetWindowRect(hw, &rs) && GetWindowRect(hwnd, &rd))
 221                 MoveWindow(hwnd,
 222                            (rs.right + rs.left + rd.left - rd.right) / 2,
 223                            (rs.bottom + rs.top + rd.top - rd.bottom) / 2,
 224                            rd.right - rd.left, rd.bottom - rd.top, TRUE);
 225         }
 226
 227         return 1;
 228       case WM_COMMAND:
 229         switch (LOWORD(wParam)) {
 230           case IDOK:
 231             EndDialog(hwnd, 1);
 232             return 0;
 233         }
 234         return 0;
 235       case WM_CLOSE:
 236         EndDialog(hwnd, 1);
 237         return 0;
 238     }
 239     return 0;
 240 }
 241
 242 /*
 243  * Dialog-box function for the About box.
 244  */
 245 static int CALLBACK AboutProc(HWND hwnd, UINT msg,
 246                               WPARAM wParam, LPARAM lParam)
 247 {
 248     switch (msg) {
 249       case WM_INITDIALOG:
 250         /*
 251          * Centre the window.
 252          */
 253         {                              /* centre the window */
 254             RECT rs, rd;
 255             HWND hw;
 256
 257             hw = GetDesktopWindow();
 258             if (GetWindowRect(hw, &rs) && GetWindowRect(hwnd, &rd))
 259                 MoveWindow(hwnd,
 260                            (rs.right + rs.left + rd.left - rd.right) / 2,
 261                            (rs.bottom + rs.top + rd.top - rd.bottom) / 2,
 262                            rd.right - rd.left, rd.bottom - rd.top, TRUE);
 263         }
 264
 265         SetDlgItemText(hwnd, 100, ver);
 266         return 1;
 267       case WM_COMMAND:
 268         switch (LOWORD(wParam)) {
 269           case IDOK:
 270             EndDialog(hwnd, 1);
 271             return 0;
 272           case 101:
 273             EnableWindow(hwnd, 0);
 274             DialogBox(hinst, MAKEINTRESOURCE(214), NULL, LicenceProc);
 275             EnableWindow(hwnd, 1);
 276             SetActiveWindow(hwnd);
 277             return 0;
 278         }
 279         return 0;
 280       case WM_CLOSE:
 281         EndDialog(hwnd, 1);
 282         return 0;
 283     }
 284     return 0;
 285 }
 286
 287 /*
 288  * Thread to generate a key.
 289  */
 290 struct rsa_key_thread_params {
 291     HWND progressbar;                  /* notify this with progress */
 292     HWND dialog;                       /* notify this on completion */
 293     int keysize;                       /* bits in key */
 294     struct RSAKey *key;
 295 };
 296 static DWORD WINAPI generate_rsa_key_thread(void *param)
 297 {
 298     struct rsa_key_thread_params *params =
 299         (struct rsa_key_thread_params *) param;
 300     struct progress prog;
 301     prog.progbar = params->progressbar;
 302
 303     rsa_generate(params->key, params->keysize, progress_update, &prog);
 304
 305     PostMessage(params->dialog, WM_DONEKEY, 0, 0);
 306
 307     sfree(params);
 308     return 0;
 309 }
 310
 311 struct MainDlgState {
 312     int collecting_entropy;
 313     int generation_thread_exists;
 314     int key_exists;
 315     int entropy_got, entropy_required, entropy_size;
 316     int keysize;
 317     int ssh2;
 318     char **commentptr;                 /* points to key.comment or ssh2key.comment */
 319     struct ssh2_userkey ssh2key;
 320     unsigned *entropy;
 321     struct RSAKey key;
 322 };
 323
 324 static void hidemany(HWND hwnd, const int *ids, int hideit)
 325 {
 326     while (*ids) {
 327         ShowWindow(GetDlgItem(hwnd, *ids++), (hideit ? SW_HIDE : SW_SHOW));
 328     }
 329 }
 330
 331 static void setupbigedit1(HWND hwnd, int id, int idstatic, struct RSAKey *key)
 332 {
 333     char *buffer;
 334     char *dec1, *dec2;
 335
 336     dec1 = bignum_decimal(key->exponent);
 337     dec2 = bignum_decimal(key->modulus);
 338     buffer = smalloc(strlen(dec1) + strlen(dec2) +
 339                      strlen(key->comment) + 30);
 340     sprintf(buffer, "%d %s %s %s",
 341             bignum_bitcount(key->modulus), dec1, dec2, key->comment);
 342     SetDlgItemText(hwnd, id, buffer);
 343     SetDlgItemText(hwnd, idstatic,
 344                    "&Public key for pasting into authorized_keys file:");
 345     sfree(dec1);
 346     sfree(dec2);
 347     sfree(buffer);
 348 }
 349
 350 static void setupbigedit2(HWND hwnd, int id, int idstatic,
 351                           struct ssh2_userkey *key)
 352 {
 353     unsigned char *pub_blob;
 354     char *buffer, *p;
 355     int pub_len;
 356     int i;
 357
 358     pub_blob = key->alg->public_blob(key->data, &pub_len);
 359     buffer = smalloc(strlen(key->alg->name) + 4 * ((pub_len + 2) / 3) +
 360                      strlen(key->comment) + 3);
 361     strcpy(buffer, key->alg->name);
 362     p = buffer + strlen(buffer);
 363     *p++ = ' ';
 364     i = 0;
 365     while (i < pub_len) {
 366         int n = (pub_len - i < 3 ? pub_len - i : 3);
 367         base64_encode_atom(pub_blob + i, n, p);
 368         i += n;
 369         p += 4;
 370     }
 371     *p++ = ' ';
 372     strcpy(p, key->comment);
 373     SetDlgItemText(hwnd, id, buffer);
 374     SetDlgItemText(hwnd, idstatic, "&Public key for pasting into "
 375                    "OpenSSH authorized_keys2 file:");
 376     sfree(pub_blob);
 377     sfree(buffer);
 378 }
 379
 380 static int save_ssh1_pubkey(char *filename, struct RSAKey *key)
 381 {
 382     char *dec1, *dec2;
 383     FILE *fp;
 384
 385     dec1 = bignum_decimal(key->exponent);
 386     dec2 = bignum_decimal(key->modulus);
 387     fp = fopen(filename, "wb");
 388     if (!fp)
 389         return 0;
 390     fprintf(fp, "%d %s %s %s\n",
 391             bignum_bitcount(key->modulus), dec1, dec2, key->comment);
 392     fclose(fp);
 393     sfree(dec1);
 394     sfree(dec2);
 395     return 1;
 396 }
 397
 398 static int save_ssh2_pubkey(char *filename, struct ssh2_userkey *key)
 399 {
 400     unsigned char *pub_blob;
 401     char *p;
 402     int pub_len;
 403     int i, column;
 404     FILE *fp;
 405
 406     pub_blob = key->alg->public_blob(key->data, &pub_len);
 407
 408     fp = fopen(filename, "wb");
 409     if (!fp)
 410         return 0;
 411
 412     fprintf(fp, "---- BEGIN SSH2 PUBLIC KEY ----\n");
 413
 414     fprintf(fp, "Comment: \"");
 415     for (p = key->comment; *p; p++) {
 416         if (*p == '\\' || *p == '\"')
 417             fputc('\\', fp);
 418         fputc(*p, fp);
 419     }
 420     fprintf(fp, "\"\n");
 421
 422     i = 0;
 423     column = 0;
 424     while (i < pub_len) {
 425         char buf[5];
 426         int n = (pub_len - i < 3 ? pub_len - i : 3);
 427         base64_encode_atom(pub_blob + i, n, buf);
 428         i += n;
 429         buf[4] = '\0';
 430         fputs(buf, fp);
 431         if (++column >= 16) {
 432             fputc('\n', fp);
 433             column = 0;
 434         }
 435     }
 436     if (column > 0)
 437         fputc('\n', fp);
 438
 439     fprintf(fp, "---- END SSH2 PUBLIC KEY ----\n");
 440     fclose(fp);
 441     sfree(pub_blob);
 442     return 1;
 443 }
 444
 445 /*
 446  * Dialog-box function for the main PuTTYgen dialog box.
 447  */
 448 static int CALLBACK MainDlgProc(HWND hwnd, UINT msg,
 449                                 WPARAM wParam, LPARAM lParam)
 450 {
 451     enum {
 452         controlidstart = 100,
 453         IDC_TITLE,
 454         IDC_BOX_KEY,
 455         IDC_NOKEY,
 456         IDC_GENERATING,
 457         IDC_PROGRESS,
 458         IDC_PKSTATIC, IDC_KEYDISPLAY,
 459         IDC_FPSTATIC, IDC_FINGERPRINT,
 460         IDC_COMMENTSTATIC, IDC_COMMENTEDIT,
 461         IDC_PASSPHRASE1STATIC, IDC_PASSPHRASE1EDIT,
 462         IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT,
 463         IDC_BOX_ACTIONS,
 464         IDC_GENSTATIC, IDC_GENERATE,
 465         IDC_LOADSTATIC, IDC_LOAD,
 466         IDC_SAVESTATIC, IDC_SAVE, IDC_SAVEPUB,
 467         IDC_BOX_PARAMS,
 468         IDC_TYPESTATIC, IDC_KEYSSH1, IDC_KEYSSH2RSA,
 469         IDC_BITSSTATIC, IDC_BITS,
 470         IDC_ABOUT,
 471     };
 472     static const int nokey_ids[] = { IDC_NOKEY, 0 };
 473     static const int generating_ids[] =
 474         { IDC_GENERATING, IDC_PROGRESS, 0 };
 475     static const int gotkey_ids[] = {
 476         IDC_PKSTATIC, IDC_KEYDISPLAY,
 477         IDC_FPSTATIC, IDC_FINGERPRINT,
 478         IDC_COMMENTSTATIC, IDC_COMMENTEDIT,
 479         IDC_PASSPHRASE1STATIC, IDC_PASSPHRASE1EDIT,
 480         IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT, 0
 481     };
 482     static const char generating_msg[] =
 483         "Please wait while a key is generated...";
 484     static const char entropy_msg[] =
 485         "Please generate some randomness by moving the mouse over the blank area.";
 486     struct MainDlgState *state;
 487
 488     switch (msg) {
 489       case WM_INITDIALOG:
 490         /*
 491          * Centre the window.
 492          */
 493         {                              /* centre the window */
 494             RECT rs, rd;
 495             HWND hw;
 496
 497             hw = GetDesktopWindow();
 498             if (GetWindowRect(hw, &rs) && GetWindowRect(hwnd, &rd))
 499                 MoveWindow(hwnd,
 500                            (rs.right + rs.left + rd.left - rd.right) / 2,
 501                            (rs.bottom + rs.top + rd.top - rd.bottom) / 2,
 502                            rd.right - rd.left, rd.bottom - rd.top, TRUE);
 503         }
 504
 505         state = smalloc(sizeof(*state));
 506         state->generation_thread_exists = FALSE;
 507         state->collecting_entropy = FALSE;
 508         state->entropy = NULL;
 509         state->key_exists = FALSE;
 510         SetWindowLong(hwnd, GWL_USERDATA, (LONG) state);
 511         {
 512             struct ctlpos cp, cp2;
 513
 514             /* Accelerators used: acglops1rb */
 515
 516             ctlposinit(&cp, hwnd, 10, 10, 10);
 517             bartitle(&cp, "Public and private key generation for PuTTY",
 518                      IDC_TITLE);
 519             beginbox(&cp, "Key", IDC_BOX_KEY);
 520             cp2 = cp;
 521             statictext(&cp2, "No key.", 1, IDC_NOKEY);
 522             cp2 = cp;
 523             statictext(&cp2, "", 1, IDC_GENERATING);
 524             progressbar(&cp2, IDC_PROGRESS);
 525             bigeditctrl(&cp,
 526                         "&Public key for pasting into authorized_keys file:",
 527                         IDC_PKSTATIC, IDC_KEYDISPLAY, 7);
 528             SendDlgItemMessage(hwnd, IDC_KEYDISPLAY, EM_SETREADONLY, 1, 0);
 529             staticedit(&cp, "Key fingerprint:", IDC_FPSTATIC,
 530                        IDC_FINGERPRINT, 75);
 531             SendDlgItemMessage(hwnd, IDC_FINGERPRINT, EM_SETREADONLY, 1,
 532                                0);
 533             staticedit(&cp, "Key &comment:", IDC_COMMENTSTATIC,
 534                        IDC_COMMENTEDIT, 75);
 535             staticpassedit(&cp, "Key p&assphrase:", IDC_PASSPHRASE1STATIC,
 536                            IDC_PASSPHRASE1EDIT, 75);
 537             staticpassedit(&cp, "C&onfirm passphrase:",
 538                            IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT, 75);
 539             endbox(&cp);
 540             beginbox(&cp, "Actions", IDC_BOX_ACTIONS);
 541             staticbtn(&cp, "Generate a public/private key pair",
 542                       IDC_GENSTATIC, "&Generate", IDC_GENERATE);
 543             staticbtn(&cp, "Load an existing private key file",
 544                       IDC_LOADSTATIC, "&Load", IDC_LOAD);
 545             static2btn(&cp, "Save the generated key", IDC_SAVESTATIC,
 546                        "Save p&ublic key", IDC_SAVEPUB,
 547                        "&Save private key", IDC_SAVE);
 548             endbox(&cp);
 549             beginbox(&cp, "Parameters", IDC_BOX_PARAMS);
 550             radioline(&cp, "Type of key to generate:", IDC_TYPESTATIC, 2,
 551                       "SSH&1 (RSA)", IDC_KEYSSH1,
 552                       "SSH2 &RSA", IDC_KEYSSH2RSA, NULL);
 553             staticedit(&cp, "Number of &bits in a generated key:",
 554                        IDC_BITSSTATIC, IDC_BITS, 20);
 555             endbox(&cp);
 556         }
 557         CheckRadioButton(hwnd, IDC_KEYSSH1, IDC_KEYSSH2RSA, IDC_KEYSSH1);
 558         SetDlgItemInt(hwnd, IDC_BITS, DEFAULT_KEYSIZE, FALSE);
 559
 560         /*
 561          * Initially, hide the progress bar and the key display,
 562          * and show the no-key display. Also disable the Save
 563          * buttons, because with no key we obviously can't save
 564          * anything.
 565          */
 566         hidemany(hwnd, nokey_ids, FALSE);
 567         hidemany(hwnd, generating_ids, TRUE);
 568         hidemany(hwnd, gotkey_ids, TRUE);
 569         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 0);
 570         EnableWindow(GetDlgItem(hwnd, IDC_SAVEPUB), 0);
 571
 572         return 1;
 573       case WM_MOUSEMOVE:
 574         state = (struct MainDlgState *) GetWindowLong(hwnd, GWL_USERDATA);
 575         if (state->collecting_entropy &&
 576             state->entropy && state->entropy_got < state->entropy_required) {
 577             state->entropy[state->entropy_got++] = lParam;
 578             state->entropy[state->entropy_got++] = GetMessageTime();
 579             SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS,
 580                                state->entropy_got, 0);
 581             if (state->entropy_got >= state->entropy_required) {
 582                 struct rsa_key_thread_params *params;
 583                 DWORD threadid;
 584
 585                 /*
 586                  * Seed the entropy pool
 587                  */
 588                 random_add_heavynoise(state->entropy, state->entropy_size);
 589                 memset(state->entropy, 0, state->entropy_size);
 590                 sfree(state->entropy);
 591                 state->collecting_entropy = FALSE;
 592
 593                 SetDlgItemText(hwnd, IDC_GENERATING, generating_msg);
 594                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
 595                                    MAKELPARAM(0, PROGRESSRANGE));
 596                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, 0, 0);
 597
 598                 params = smalloc(sizeof(*params));
 599                 params->progressbar = GetDlgItem(hwnd, IDC_PROGRESS);
 600                 params->dialog = hwnd;
 601                 params->keysize = state->keysize;
 602                 params->key = &state->key;
 603
 604                 if (!CreateThread(NULL, 0, generate_rsa_key_thread,
 605                                   params, 0, &threadid)) {
 606                     MessageBox(hwnd, "Out of thread resources",
 607                                "Key generation error",
 608                                MB_OK | MB_ICONERROR);
 609                     sfree(params);
 610                 } else {
 611                     state->generation_thread_exists = TRUE;
 612                 }
 613             }
 614         }
 615         break;
 616       case WM_COMMAND:
 617         switch (LOWORD(wParam)) {
 618           case IDC_COMMENTEDIT:
 619             if (HIWORD(wParam) == EN_CHANGE) {
 620                 state = (struct MainDlgState *)
 621                     GetWindowLong(hwnd, GWL_USERDATA);
 622                 if (state->key_exists) {
 623                     HWND editctl = GetDlgItem(hwnd, IDC_COMMENTEDIT);
 624                     int len = GetWindowTextLength(editctl);
 625                     if (*state->commentptr)
 626                         sfree(*state->commentptr);
 627                     *state->commentptr = smalloc(len + 1);
 628                     GetWindowText(editctl, *state->commentptr, len + 1);
 629                     if (state->ssh2) {
 630                         setupbigedit2(hwnd, IDC_KEYDISPLAY, IDC_PKSTATIC,
 631                                       &state->ssh2key);
 632                     } else {
 633                         setupbigedit1(hwnd, IDC_KEYDISPLAY, IDC_PKSTATIC,
 634                                       &state->key);
 635                     }
 636                 }
 637             }
 638             break;
 639           case IDC_ABOUT:
 640             EnableWindow(hwnd, 0);
 641             DialogBox(hinst, MAKEINTRESOURCE(213), NULL, AboutProc);
 642             EnableWindow(hwnd, 1);
 643             SetActiveWindow(hwnd);
 644             return 0;
 645           case IDC_GENERATE:
 646             state =
 647                 (struct MainDlgState *) GetWindowLong(hwnd, GWL_USERDATA);
 648             if (!state->generation_thread_exists) {
 649                 BOOL ok;
 650                 state->keysize = GetDlgItemInt(hwnd, IDC_BITS, &ok, FALSE);
 651                 if (!ok)
 652                     state->keysize = DEFAULT_KEYSIZE;
 653                 /* If we ever introduce a new key type, check it here! */
 654                 state->ssh2 = !IsDlgButtonChecked(hwnd, IDC_KEYSSH1);
 655                 if (state->keysize < 256) {
 656                     int ret = MessageBox(hwnd,
 657                                          "PuTTYgen will not generate a key"
 658                                          " smaller than 256 bits.\n"
 659                                          "Key length reset to 256. Continue?",
 660                                          "PuTTYgen Warning",
 661                                          MB_ICONWARNING | MB_OKCANCEL);
 662                     if (ret != IDOK)
 663                         break;
 664                     state->keysize = 256;
 665                     SetDlgItemInt(hwnd, IDC_BITS, 256, FALSE);
 666                 }
 667                 hidemany(hwnd, nokey_ids, TRUE);
 668                 hidemany(hwnd, generating_ids, FALSE);
 669                 hidemany(hwnd, gotkey_ids, TRUE);
 670                 EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 0);
 671                 EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 0);
 672                 EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 0);
 673                 EnableWindow(GetDlgItem(hwnd, IDC_SAVEPUB), 0);
 674                 EnableWindow(GetDlgItem(hwnd, IDC_KEYSSH1), 0);
 675                 EnableWindow(GetDlgItem(hwnd, IDC_KEYSSH2RSA), 0);
 676                 EnableWindow(GetDlgItem(hwnd, IDC_BITS), 0);
 677                 state->key_exists = FALSE;
 678                 SetDlgItemText(hwnd, IDC_GENERATING, entropy_msg);
 679                 state->collecting_entropy = TRUE;
 680
 681                 /*
 682                  * My brief statistical tests on mouse movements
 683                  * suggest that there are about 2.5 bits of
 684                  * randomness in the x position, 2.5 in the y
 685                  * position, and 1.7 in the message time, making
 686                  * 5.7 bits of unpredictability per mouse movement.
 687                  * However, other people have told me it's far less
 688                  * than that, so I'm going to be stupidly cautious
 689                  * and knock that down to a nice round 2. With this
 690                  * method, we require two words per mouse movement,
 691                  * so with 2 bits per mouse movement we expect 2
 692                  * bits every 2 words.
 693                  */
 694                 state->entropy_required = (state->keysize / 2) * 2;
 695                 state->entropy_got = 0;
 696                 state->entropy_size = (state->entropy_required *
 697                                        sizeof(*state->entropy));
 698                 state->entropy = smalloc(state->entropy_size);
 699
 700                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
 701                                    MAKELPARAM(0, state->entropy_required));
 702                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, 0, 0);
 703             }
 704             break;
 705           case IDC_SAVE:
 706             state =
 707                 (struct MainDlgState *) GetWindowLong(hwnd, GWL_USERDATA);
 708             if (state->key_exists) {
 709                 char filename[FILENAME_MAX];
 710                 char passphrase[PASSPHRASE_MAXLEN];
 711                 char passphrase2[PASSPHRASE_MAXLEN];
 712                 GetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT,
 713                                passphrase, sizeof(passphrase));
 714                 GetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT,
 715                                passphrase2, sizeof(passphrase2));
 716                 if (strcmp(passphrase, passphrase2)) {
 717                     MessageBox(hwnd,
 718                                "The two passphrases given do not match.",
 719                                "PuTTYgen Error", MB_OK | MB_ICONERROR);
 720                     break;
 721                 }
 722                 if (!*passphrase) {
 723                     int ret;
 724                     ret = MessageBox(hwnd,
 725                                      "Are you sure you want to save this key\n"
 726                                      "without a passphrase to protect it?",
 727                                      "PuTTYgen Warning",
 728                                      MB_YESNO | MB_ICONWARNING);
 729                     if (ret != IDYES)
 730                         break;
 731                 }
 732                 if (prompt_keyfile(hwnd, "Save private key as:",
 733                                    filename, 1)) {
 734                     int ret;
 735                     FILE *fp = fopen(filename, "r");
 736                     if (fp) {
 737                         char buffer[FILENAME_MAX + 80];
 738                         fclose(fp);
 739                         sprintf(buffer, "Overwrite existing file\n%.*s?",
 740                                 FILENAME_MAX, filename);
 741                         ret = MessageBox(hwnd, buffer, "PuTTYgen Warning",
 742                                          MB_YESNO | MB_ICONWARNING);
 743                         if (ret != IDYES)
 744                             break;
 745                     }
 746                     if (state->ssh2) {
 747                         ret = ssh2_save_userkey(filename, &state->ssh2key,
 748                                                 *passphrase ? passphrase :
 749                                                 NULL);
 750                     } else {
 751                         ret = saversakey(filename, &state->key,
 752                                          *passphrase ? passphrase : NULL);
 753                     }
 754                     if (ret <= 0) {
 755                         MessageBox(hwnd, "Unable to save key file",
 756                                    "PuTTYgen Error", MB_OK | MB_ICONERROR);
 757                     }
 758                 }
 759             }
 760             break;
 761           case IDC_SAVEPUB:
 762             state =
 763                 (struct MainDlgState *) GetWindowLong(hwnd, GWL_USERDATA);
 764             if (state->key_exists) {
 765                 char filename[FILENAME_MAX];
 766                 if (prompt_keyfile(hwnd, "Save public key as:",
 767                                    filename, 1)) {
 768                     int ret;
 769                     FILE *fp = fopen(filename, "r");
 770                     if (fp) {
 771                         char buffer[FILENAME_MAX + 80];
 772                         fclose(fp);
 773                         sprintf(buffer, "Overwrite existing file\n%.*s?",
 774                                 FILENAME_MAX, filename);
 775                         ret = MessageBox(hwnd, buffer, "PuTTYgen Warning",
 776                                          MB_YESNO | MB_ICONWARNING);
 777                         if (ret != IDYES)
 778                             break;
 779                     }
 780                     if (state->ssh2) {
 781                         ret = save_ssh2_pubkey(filename, &state->ssh2key);
 782                     } else {
 783                         ret = save_ssh1_pubkey(filename, &state->key);
 784                     }
 785                     if (ret <= 0) {
 786                         MessageBox(hwnd, "Unable to save key file",
 787                                    "PuTTYgen Error", MB_OK | MB_ICONERROR);
 788                     }
 789                 }
 790             }
 791             break;
 792           case IDC_LOAD:
 793             state =
 794                 (struct MainDlgState *) GetWindowLong(hwnd, GWL_USERDATA);
 795             if (!state->generation_thread_exists) {
 796                 char filename[FILENAME_MAX];
 797                 if (prompt_keyfile(hwnd, "Load private key:", filename, 0)) {
 798                     char passphrase[PASSPHRASE_MAXLEN];
 799                     int needs_pass;
 800                     int ver;
 801                     int ret;
 802                     char *comment;
 803                     struct PassphraseProcStruct pps;
 804                     struct RSAKey newkey1;
 805                     struct ssh2_userkey *newkey2 = NULL;
 806
 807                     ver = keyfile_version(filename);
 808                     if (ver == 0) {
 809                         MessageBox(NULL, "Couldn't load private key.",
 810                                    "PuTTYgen Error", MB_OK | MB_ICONERROR);
 811                         break;
 812                     }
 813
 814                     comment = NULL;
 815                     if (ver == 1)
 816                         needs_pass = rsakey_encrypted(filename, &comment);
 817                     else
 818                         needs_pass =
 819                             ssh2_userkey_encrypted(filename, &comment);
 820                     pps.passphrase = passphrase;
 821                     pps.comment = comment;
 822                     do {
 823                         if (needs_pass) {
 824                             int dlgret;
 825                             dlgret = DialogBoxParam(hinst,
 826                                                     MAKEINTRESOURCE(210),
 827                                                     NULL, PassphraseProc,
 828                                                     (LPARAM) & pps);
 829                             if (!dlgret) {
 830                                 ret = -2;
 831                                 break;
 832                             }
 833                         } else
 834                             *passphrase = '\0';
 835                         if (ver == 1)
 836                             ret =
 837                                 loadrsakey(filename, &newkey1, passphrase);
 838                         else {
 839                             newkey2 =
 840                                 ssh2_load_userkey(filename, passphrase);
 841                             if (newkey2 == SSH2_WRONG_PASSPHRASE)
 842                                 ret = -1;
 843                             else if (!newkey2)
 844                                 ret = 0;
 845                             else
 846                                 ret = 1;
 847                         }
 848                     } while (ret == -1);
 849                     if (comment)
 850                         sfree(comment);
 851                     if (ret == 0) {
 852                         MessageBox(NULL, "Couldn't load private key.",
 853                                    "PuTTYgen Error", MB_OK | MB_ICONERROR);
 854                     } else if (ret == 1) {
 855                         EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 1);
 856                         EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 1);
 857                         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 1);
 858                         EnableWindow(GetDlgItem(hwnd, IDC_SAVEPUB), 1);
 859                         EnableWindow(GetDlgItem(hwnd, IDC_KEYSSH1), 1);
 860                         EnableWindow(GetDlgItem(hwnd, IDC_KEYSSH2RSA), 1);
 861                         EnableWindow(GetDlgItem(hwnd, IDC_BITS), 1);
 862                         /*
 863                          * Now update the key controls with all the
 864                          * key data.
 865                          */
 866                         {
 867                             SetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT,
 868                                            passphrase);
 869                             SetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT,
 870                                            passphrase);
 871                             if (ver == 1) {
 872                                 char buf[128];
 873                                 char *savecomment;
 874
 875                                 state->ssh2 = FALSE;
 876                                 state->commentptr = &state->key.comment;
 877                                 state->key = newkey1;
 878
 879                                 /*
 880                                  * Set the key fingerprint.
 881                                  */
 882                                 savecomment = state->key.comment;
 883                                 state->key.comment = NULL;
 884                                 rsa_fingerprint(buf, sizeof(buf),
 885                                                 &state->key);
 886                                 state->key.comment = savecomment;
 887
 888                                 SetDlgItemText(hwnd, IDC_FINGERPRINT, buf);
 889                                 /*
 890                                  * Construct a decimal representation
 891                                  * of the key, for pasting into
 892                                  * .ssh/authorized_keys on a Unix box.
 893                                  */
 894                                 setupbigedit1(hwnd, IDC_KEYDISPLAY,
 895                                               IDC_PKSTATIC, &state->key);
 896                             } else {
 897                                 char *fp;
 898                                 char *savecomment;
 899
 900                                 state->ssh2 = TRUE;
 901                                 state->commentptr =
 902                                     &state->ssh2key.comment;
 903                                 state->ssh2key = *newkey2;      /* structure copy */
 904                                 sfree(newkey2);
 905
 906                                 savecomment = state->ssh2key.comment;
 907                                 state->ssh2key.comment = NULL;
 908                                 fp =
 909                                     state->ssh2key.alg->
 910                                     fingerprint(state->ssh2key.data);
 911                                 state->ssh2key.comment = savecomment;
 912
 913                                 SetDlgItemText(hwnd, IDC_FINGERPRINT, fp);
 914                                 sfree(fp);
 915
 916                                 setupbigedit2(hwnd, IDC_KEYDISPLAY,
 917                                               IDC_PKSTATIC, &state->ssh2key);
 918                             }
 919                             SetDlgItemText(hwnd, IDC_COMMENTEDIT,
 920                                            *state->commentptr);
 921                         }
 922                         /*
 923                          * Finally, hide the progress bar and show
 924                          * the key data.
 925                          */
 926                         hidemany(hwnd, nokey_ids, TRUE);
 927                         hidemany(hwnd, generating_ids, TRUE);
 928                         hidemany(hwnd, gotkey_ids, FALSE);
 929                         state->key_exists = TRUE;
 930                     }
 931                 }
 932             }
 933             break;
 934         }
 935         return 0;
 936       case WM_DONEKEY:
 937         state = (struct MainDlgState *) GetWindowLong(hwnd, GWL_USERDATA);
 938         state->generation_thread_exists = FALSE;
 939         state->key_exists = TRUE;
 940         SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, PROGRESSRANGE,
 941                            0);
 942         EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 1);
 943         EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 1);
 944         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 1);
 945         EnableWindow(GetDlgItem(hwnd, IDC_SAVEPUB), 1);
 946         EnableWindow(GetDlgItem(hwnd, IDC_KEYSSH1), 1);
 947         EnableWindow(GetDlgItem(hwnd, IDC_KEYSSH2RSA), 1);
 948         EnableWindow(GetDlgItem(hwnd, IDC_BITS), 1);
 949         if (state->ssh2) {
 950             state->ssh2key.data = &state->key;
 951             state->ssh2key.alg = &ssh_rsa;
 952             state->commentptr = &state->ssh2key.comment;
 953         } else {
 954             state->commentptr = &state->key.comment;
 955         }
 956         /*
 957          * Invent a comment for the key. We'll do this by including
 958          * the date in it. This will be so horrifyingly ugly that
 959          * the user will immediately want to change it, which is
 960          * what we want :-)
 961          */
 962         *state->commentptr = smalloc(30);
 963         {
 964             time_t t;
 965             struct tm *tm;
 966             time(&t);
 967             tm = localtime(&t);
 968             strftime(*state->commentptr, 30, "rsa-key-%Y%m%d", tm);
 969         }
 970
 971         /*
 972          * Now update the key controls with all the key data.
 973          */
 974         {
 975             char *savecomment;
 976             /*
 977              * Blank passphrase, initially. This isn't dangerous,
 978              * because we will warn (Are You Sure?) before allowing
 979              * the user to save an unprotected private key.
 980              */
 981             SetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT, "");
 982             SetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT, "");
 983             /*
 984              * Set the comment.
 985              */
 986             SetDlgItemText(hwnd, IDC_COMMENTEDIT, *state->commentptr);
 987             /*
 988              * Set the key fingerprint.
 989              */
 990             savecomment = *state->commentptr;
 991             *state->commentptr = NULL;
 992             if (state->ssh2) {
 993                 char *fp;
 994                 fp = state->ssh2key.alg->fingerprint(state->ssh2key.data);
 995                 SetDlgItemText(hwnd, IDC_FINGERPRINT, fp);
 996                 sfree(fp);
 997             } else {
 998                 char buf[128];
 999                 rsa_fingerprint(buf, sizeof(buf), &state->key);
1000                 SetDlgItemText(hwnd, IDC_FINGERPRINT, buf);
1001             }
1002             *state->commentptr = savecomment;
1003             /*
1004              * Construct a decimal representation of the key, for
1005              * pasting into .ssh/authorized_keys or
1006              * .ssh/authorized_keys2 on a Unix box.
1007              */
1008             if (state->ssh2) {
1009                 setupbigedit2(hwnd, IDC_KEYDISPLAY,
1010                               IDC_PKSTATIC, &state->ssh2key);
1011             } else {
1012                 setupbigedit1(hwnd, IDC_KEYDISPLAY,
1013                               IDC_PKSTATIC, &state->key);
1014             }
1015         }
1016         /*
1017          * Finally, hide the progress bar and show the key data.
1018          */
1019         hidemany(hwnd, nokey_ids, TRUE);
1020         hidemany(hwnd, generating_ids, TRUE);
1021         hidemany(hwnd, gotkey_ids, FALSE);
1022         break;
1023       case WM_CLOSE:
1024         state = (struct MainDlgState *) GetWindowLong(hwnd, GWL_USERDATA);
1025         sfree(state);
1026         EndDialog(hwnd, 1);
1027         return 0;
1028     }
1029     return 0;
1030 }
1031
1032 int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show)
1033 {
1034     InitCommonControls();
1035     hinst = inst;
1036     random_init();
1037     return DialogBox(hinst, MAKEINTRESOURCE(201), NULL,
1038                      MainDlgProc) != IDOK;
1039 }