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 PROGRESSRANGE 65535
  25 #define MAXPHASE 5
  26 struct progress {
  27     int nphases;
  28     struct {
  29         int exponential;
  30         unsigned startpoint, total;
  31         unsigned param, current, n;    /* if exponential */
  32         unsigned mult;                 /* if linear */
  33     } phases[MAXPHASE];
  34     unsigned total, divisor, range;
  35     HWND progbar;
  36 };
  37
  38 static void progress_update(void *param, int action, int phase, int iprogress)
  39 {
  40     struct progress *p = (struct progress *) param;
  41     unsigned progress = iprogress;
  42     int position;
  43
  44     if (action < PROGFN_READY && p->nphases < phase)
  45         p->nphases = phase;
  46     switch (action) {
  47       case PROGFN_LIN_PHASE:
  48         p->phases[phase-1].exponential = 0;
  49         p->phases[phase-1].mult = p->phases[phase].total / progress;
  50         break;
  51       case PROGFN_EXP_PHASE:
  52         p->phases[phase-1].exponential = 1;
  53         p->phases[phase-1].param = 0x10000 + progress;
  54         p->phases[phase-1].current = p->phases[phase-1].total;
  55         p->phases[phase-1].n = 0;
  56         break;
  57       case PROGFN_PHASE_EXTENT:
  58         p->phases[phase-1].total = progress;
  59         break;
  60       case PROGFN_READY:
  61         {
  62             unsigned total = 0;
  63             int i;
  64             for (i = 0; i < p->nphases; i++) {
  65                 p->phases[i].startpoint = total;
  66                 total += p->phases[i].total;
  67             }
  68             p->total = total;
  69             p->divisor = ((p->total + PROGRESSRANGE - 1) / PROGRESSRANGE);
  70             p->range = p->total / p->divisor;
  71             SendMessage(p->progbar, PBM_SETRANGE, 0, MAKELPARAM(0, p->range));
  72         }
  73         break;
  74       case PROGFN_PROGRESS:
  75         if (p->phases[phase-1].exponential) {
  76             while (p->phases[phase-1].n < progress) {
  77                 p->phases[phase-1].n++;
  78                 p->phases[phase-1].current *= p->phases[phase-1].param;
  79                 p->phases[phase-1].current /= 0x10000;
  80             }
  81             position = (p->phases[phase-1].startpoint +
  82                         p->phases[phase-1].total - p->phases[phase-1].current);
  83         } else {
  84             position = (p->phases[phase-1].startpoint +
  85                         progress * p->phases[phase-1].mult);
  86         }
  87         SendMessage(p->progbar, PBM_SETPOS, position / p->divisor, 0);
  88         break;
  89     }
  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     int is_dsa;
 295     struct RSAKey *key;
 296     struct dss_key *dsskey;
 297 };
 298 static DWORD WINAPI generate_rsa_key_thread(void *param)
 299 {
 300     struct rsa_key_thread_params *params =
 301         (struct rsa_key_thread_params *) param;
 302     struct progress prog;
 303     prog.progbar = params->progressbar;
 304
 305     if (params->is_dsa)
 306         dsa_generate(params->dsskey, params->keysize, progress_update, &prog);
 307     else
 308         rsa_generate(params->key, params->keysize, progress_update, &prog);
 309
 310     PostMessage(params->dialog, WM_DONEKEY, 0, 0);
 311
 312     sfree(params);
 313     return 0;
 314 }
 315
 316 struct MainDlgState {
 317     int collecting_entropy;
 318     int generation_thread_exists;
 319     int key_exists;
 320     int entropy_got, entropy_required, entropy_size;
 321     int keysize;
 322     int ssh2, is_dsa;
 323     char **commentptr;                 /* points to key.comment or ssh2key.comment */
 324     struct ssh2_userkey ssh2key;
 325     unsigned *entropy;
 326     struct RSAKey key;
 327     struct dss_key dsskey;
 328 };
 329
 330 static void hidemany(HWND hwnd, const int *ids, int hideit)
 331 {
 332     while (*ids) {
 333         ShowWindow(GetDlgItem(hwnd, *ids++), (hideit ? SW_HIDE : SW_SHOW));
 334     }
 335 }
 336
 337 static void setupbigedit1(HWND hwnd, int id, int idstatic, struct RSAKey *key)
 338 {
 339     char *buffer;
 340     char *dec1, *dec2;
 341
 342     dec1 = bignum_decimal(key->exponent);
 343     dec2 = bignum_decimal(key->modulus);
 344     buffer = smalloc(strlen(dec1) + strlen(dec2) +
 345                      strlen(key->comment) + 30);
 346     sprintf(buffer, "%d %s %s %s",
 347             bignum_bitcount(key->modulus), dec1, dec2, key->comment);
 348     SetDlgItemText(hwnd, id, buffer);
 349     SetDlgItemText(hwnd, idstatic,
 350                    "&Public key for pasting into authorized_keys file:");
 351     sfree(dec1);
 352     sfree(dec2);
 353     sfree(buffer);
 354 }
 355
 356 static void setupbigedit2(HWND hwnd, int id, int idstatic,
 357                           struct ssh2_userkey *key)
 358 {
 359     unsigned char *pub_blob;
 360     char *buffer, *p;
 361     int pub_len;
 362     int i;
 363
 364     pub_blob = key->alg->public_blob(key->data, &pub_len);
 365     buffer = smalloc(strlen(key->alg->name) + 4 * ((pub_len + 2) / 3) +
 366                      strlen(key->comment) + 3);
 367     strcpy(buffer, key->alg->name);
 368     p = buffer + strlen(buffer);
 369     *p++ = ' ';
 370     i = 0;
 371     while (i < pub_len) {
 372         int n = (pub_len - i < 3 ? pub_len - i : 3);
 373         base64_encode_atom(pub_blob + i, n, p);
 374         i += n;
 375         p += 4;
 376     }
 377     *p++ = ' ';
 378     strcpy(p, key->comment);
 379     SetDlgItemText(hwnd, id, buffer);
 380     SetDlgItemText(hwnd, idstatic, "&Public key for pasting into "
 381                    "OpenSSH authorized_keys2 file:");
 382     sfree(pub_blob);
 383     sfree(buffer);
 384 }
 385
 386 static int save_ssh1_pubkey(char *filename, struct RSAKey *key)
 387 {
 388     char *dec1, *dec2;
 389     FILE *fp;
 390
 391     dec1 = bignum_decimal(key->exponent);
 392     dec2 = bignum_decimal(key->modulus);
 393     fp = fopen(filename, "wb");
 394     if (!fp)
 395         return 0;
 396     fprintf(fp, "%d %s %s %s\n",
 397             bignum_bitcount(key->modulus), dec1, dec2, key->comment);
 398     fclose(fp);
 399     sfree(dec1);
 400     sfree(dec2);
 401     return 1;
 402 }
 403
 404 static int save_ssh2_pubkey(char *filename, struct ssh2_userkey *key)
 405 {
 406     unsigned char *pub_blob;
 407     char *p;
 408     int pub_len;
 409     int i, column;
 410     FILE *fp;
 411
 412     pub_blob = key->alg->public_blob(key->data, &pub_len);
 413
 414     fp = fopen(filename, "wb");
 415     if (!fp)
 416         return 0;
 417
 418     fprintf(fp, "---- BEGIN SSH2 PUBLIC KEY ----\n");
 419
 420     fprintf(fp, "Comment: \"");
 421     for (p = key->comment; *p; p++) {
 422         if (*p == '\\' || *p == '\"')
 423             fputc('\\', fp);
 424         fputc(*p, fp);
 425     }
 426     fprintf(fp, "\"\n");
 427
 428     i = 0;
 429     column = 0;
 430     while (i < pub_len) {
 431         char buf[5];
 432         int n = (pub_len - i < 3 ? pub_len - i : 3);
 433         base64_encode_atom(pub_blob + i, n, buf);
 434         i += n;
 435         buf[4] = '\0';
 436         fputs(buf, fp);
 437         if (++column >= 16) {
 438             fputc('\n', fp);
 439             column = 0;
 440         }
 441     }
 442     if (column > 0)
 443         fputc('\n', fp);
 444
 445     fprintf(fp, "---- END SSH2 PUBLIC KEY ----\n");
 446     fclose(fp);
 447     sfree(pub_blob);
 448     return 1;
 449 }
 450
 451 /*
 452  * Dialog-box function for the main PuTTYgen dialog box.
 453  */
 454 static int CALLBACK MainDlgProc(HWND hwnd, UINT msg,
 455                                 WPARAM wParam, LPARAM lParam)
 456 {
 457     enum {
 458         controlidstart = 100,
 459         IDC_TITLE,
 460         IDC_BOX_KEY,
 461         IDC_NOKEY,
 462         IDC_GENERATING,
 463         IDC_PROGRESS,
 464         IDC_PKSTATIC, IDC_KEYDISPLAY,
 465         IDC_FPSTATIC, IDC_FINGERPRINT,
 466         IDC_COMMENTSTATIC, IDC_COMMENTEDIT,
 467         IDC_PASSPHRASE1STATIC, IDC_PASSPHRASE1EDIT,
 468         IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT,
 469         IDC_BOX_ACTIONS,
 470         IDC_GENSTATIC, IDC_GENERATE,
 471         IDC_LOADSTATIC, IDC_LOAD,
 472         IDC_SAVESTATIC, IDC_SAVE, IDC_SAVEPUB,
 473         IDC_BOX_PARAMS,
 474         IDC_TYPESTATIC, IDC_KEYSSH1, IDC_KEYSSH2RSA, IDC_KEYSSH2DSA,
 475         IDC_BITSSTATIC, IDC_BITS,
 476         IDC_ABOUT,
 477     };
 478     static const int nokey_ids[] = { IDC_NOKEY, 0 };
 479     static const int generating_ids[] =
 480         { IDC_GENERATING, IDC_PROGRESS, 0 };
 481     static const int gotkey_ids[] = {
 482         IDC_PKSTATIC, IDC_KEYDISPLAY,
 483         IDC_FPSTATIC, IDC_FINGERPRINT,
 484         IDC_COMMENTSTATIC, IDC_COMMENTEDIT,
 485         IDC_PASSPHRASE1STATIC, IDC_PASSPHRASE1EDIT,
 486         IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT, 0
 487     };
 488     static const char generating_msg[] =
 489         "Please wait while a key is generated...";
 490     static const char entropy_msg[] =
 491         "Please generate some randomness by moving the mouse over the blank area.";
 492     struct MainDlgState *state;
 493
 494     switch (msg) {
 495       case WM_INITDIALOG:
 496         /*
 497          * Centre the window.
 498          */
 499         {                              /* centre the window */
 500             RECT rs, rd;
 501             HWND hw;
 502
 503             hw = GetDesktopWindow();
 504             if (GetWindowRect(hw, &rs) && GetWindowRect(hwnd, &rd))
 505                 MoveWindow(hwnd,
 506                            (rs.right + rs.left + rd.left - rd.right) / 2,
 507                            (rs.bottom + rs.top + rd.top - rd.bottom) / 2,
 508                            rd.right - rd.left, rd.bottom - rd.top, TRUE);
 509         }
 510
 511         state = smalloc(sizeof(*state));
 512         state->generation_thread_exists = FALSE;
 513         state->collecting_entropy = FALSE;
 514         state->entropy = NULL;
 515         state->key_exists = FALSE;
 516         SetWindowLong(hwnd, GWL_USERDATA, (LONG) state);
 517         {
 518             struct ctlpos cp, cp2;
 519
 520             /* Accelerators used: acglops1rbd */
 521
 522             ctlposinit(&cp, hwnd, 10, 10, 10);
 523             bartitle(&cp, "Public and private key generation for PuTTY",
 524                      IDC_TITLE);
 525             beginbox(&cp, "Key", IDC_BOX_KEY);
 526             cp2 = cp;
 527             statictext(&cp2, "No key.", 1, IDC_NOKEY);
 528             cp2 = cp;
 529             statictext(&cp2, "", 1, IDC_GENERATING);
 530             progressbar(&cp2, IDC_PROGRESS);
 531             bigeditctrl(&cp,
 532                         "&Public key for pasting into authorized_keys file:",
 533                         IDC_PKSTATIC, IDC_KEYDISPLAY, 7);
 534             SendDlgItemMessage(hwnd, IDC_KEYDISPLAY, EM_SETREADONLY, 1, 0);
 535             staticedit(&cp, "Key fingerprint:", IDC_FPSTATIC,
 536                        IDC_FINGERPRINT, 75);
 537             SendDlgItemMessage(hwnd, IDC_FINGERPRINT, EM_SETREADONLY, 1,
 538                                0);
 539             staticedit(&cp, "Key &comment:", IDC_COMMENTSTATIC,
 540                        IDC_COMMENTEDIT, 75);
 541             staticpassedit(&cp, "Key p&assphrase:", IDC_PASSPHRASE1STATIC,
 542                            IDC_PASSPHRASE1EDIT, 75);
 543             staticpassedit(&cp, "C&onfirm passphrase:",
 544                            IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT, 75);
 545             endbox(&cp);
 546             beginbox(&cp, "Actions", IDC_BOX_ACTIONS);
 547             staticbtn(&cp, "Generate a public/private key pair",
 548                       IDC_GENSTATIC, "&Generate", IDC_GENERATE);
 549             staticbtn(&cp, "Load an existing private key file",
 550                       IDC_LOADSTATIC, "&Load", IDC_LOAD);
 551             static2btn(&cp, "Save the generated key", IDC_SAVESTATIC,
 552                        "Save p&ublic key", IDC_SAVEPUB,
 553                        "&Save private key", IDC_SAVE);
 554             endbox(&cp);
 555             beginbox(&cp, "Parameters", IDC_BOX_PARAMS);
 556             radioline(&cp, "Type of key to generate:", IDC_TYPESTATIC, 3,
 557                       "SSH&1 (RSA)", IDC_KEYSSH1,
 558                       "SSH2 &RSA", IDC_KEYSSH2RSA,
 559                       "SSH2 &DSA", IDC_KEYSSH2DSA, NULL);
 560             staticedit(&cp, "Number of &bits in a generated key:",
 561                        IDC_BITSSTATIC, IDC_BITS, 20);
 562             endbox(&cp);
 563         }
 564         CheckRadioButton(hwnd, IDC_KEYSSH1, IDC_KEYSSH2RSA, IDC_KEYSSH1);
 565         SetDlgItemInt(hwnd, IDC_BITS, DEFAULT_KEYSIZE, FALSE);
 566
 567         /*
 568          * Initially, hide the progress bar and the key display,
 569          * and show the no-key display. Also disable the Save
 570          * buttons, because with no key we obviously can't save
 571          * anything.
 572          */
 573         hidemany(hwnd, nokey_ids, FALSE);
 574         hidemany(hwnd, generating_ids, TRUE);
 575         hidemany(hwnd, gotkey_ids, TRUE);
 576         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 0);
 577         EnableWindow(GetDlgItem(hwnd, IDC_SAVEPUB), 0);
 578
 579         return 1;
 580       case WM_MOUSEMOVE:
 581         state = (struct MainDlgState *) GetWindowLong(hwnd, GWL_USERDATA);
 582         if (state->collecting_entropy &&
 583             state->entropy && state->entropy_got < state->entropy_required) {
 584             state->entropy[state->entropy_got++] = lParam;
 585             state->entropy[state->entropy_got++] = GetMessageTime();
 586             SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS,
 587                                state->entropy_got, 0);
 588             if (state->entropy_got >= state->entropy_required) {
 589                 struct rsa_key_thread_params *params;
 590                 DWORD threadid;
 591
 592                 /*
 593                  * Seed the entropy pool
 594                  */
 595                 random_add_heavynoise(state->entropy, state->entropy_size);
 596                 memset(state->entropy, 0, state->entropy_size);
 597                 sfree(state->entropy);
 598                 state->collecting_entropy = FALSE;
 599
 600                 SetDlgItemText(hwnd, IDC_GENERATING, generating_msg);
 601                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
 602                                    MAKELPARAM(0, PROGRESSRANGE));
 603                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, 0, 0);
 604
 605                 params = smalloc(sizeof(*params));
 606                 params->progressbar = GetDlgItem(hwnd, IDC_PROGRESS);
 607                 params->dialog = hwnd;
 608                 params->keysize = state->keysize;
 609                 params->is_dsa = state->is_dsa;
 610                 params->key = &state->key;
 611                 params->dsskey = &state->dsskey;
 612
 613                 if (!CreateThread(NULL, 0, generate_rsa_key_thread,
 614                                   params, 0, &threadid)) {
 615                     MessageBox(hwnd, "Out of thread resources",
 616                                "Key generation error",
 617                                MB_OK | MB_ICONERROR);
 618                     sfree(params);
 619                 } else {
 620                     state->generation_thread_exists = TRUE;
 621                 }
 622             }
 623         }
 624         break;
 625       case WM_COMMAND:
 626         switch (LOWORD(wParam)) {
 627           case IDC_COMMENTEDIT:
 628             if (HIWORD(wParam) == EN_CHANGE) {
 629                 state = (struct MainDlgState *)
 630                     GetWindowLong(hwnd, GWL_USERDATA);
 631                 if (state->key_exists) {
 632                     HWND editctl = GetDlgItem(hwnd, IDC_COMMENTEDIT);
 633                     int len = GetWindowTextLength(editctl);
 634                     if (*state->commentptr)
 635                         sfree(*state->commentptr);
 636                     *state->commentptr = smalloc(len + 1);
 637                     GetWindowText(editctl, *state->commentptr, len + 1);
 638                     if (state->ssh2) {
 639                         setupbigedit2(hwnd, IDC_KEYDISPLAY, IDC_PKSTATIC,
 640                                       &state->ssh2key);
 641                     } else {
 642                         setupbigedit1(hwnd, IDC_KEYDISPLAY, IDC_PKSTATIC,
 643                                       &state->key);
 644                     }
 645                 }
 646             }
 647             break;
 648           case IDC_ABOUT:
 649             EnableWindow(hwnd, 0);
 650             DialogBox(hinst, MAKEINTRESOURCE(213), NULL, AboutProc);
 651             EnableWindow(hwnd, 1);
 652             SetActiveWindow(hwnd);
 653             return 0;
 654           case IDC_GENERATE:
 655             state =
 656                 (struct MainDlgState *) GetWindowLong(hwnd, GWL_USERDATA);
 657             if (!state->generation_thread_exists) {
 658                 BOOL ok;
 659                 state->keysize = GetDlgItemInt(hwnd, IDC_BITS, &ok, FALSE);
 660                 if (!ok)
 661                     state->keysize = DEFAULT_KEYSIZE;
 662                 /* If we ever introduce a new key type, check it here! */
 663                 state->ssh2 = !IsDlgButtonChecked(hwnd, IDC_KEYSSH1);
 664                 state->is_dsa = IsDlgButtonChecked(hwnd, IDC_KEYSSH2DSA);
 665                 if (state->keysize < 256) {
 666                     int ret = MessageBox(hwnd,
 667                                          "PuTTYgen will not generate a key"
 668                                          " smaller than 256 bits.\n"
 669                                          "Key length reset to 256. Continue?",
 670                                          "PuTTYgen Warning",
 671                                          MB_ICONWARNING | MB_OKCANCEL);
 672                     if (ret != IDOK)
 673                         break;
 674                     state->keysize = 256;
 675                     SetDlgItemInt(hwnd, IDC_BITS, 256, FALSE);
 676                 }
 677                 hidemany(hwnd, nokey_ids, TRUE);
 678                 hidemany(hwnd, generating_ids, FALSE);
 679                 hidemany(hwnd, gotkey_ids, TRUE);
 680                 EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 0);
 681                 EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 0);
 682                 EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 0);
 683                 EnableWindow(GetDlgItem(hwnd, IDC_SAVEPUB), 0);
 684                 EnableWindow(GetDlgItem(hwnd, IDC_KEYSSH1), 0);
 685                 EnableWindow(GetDlgItem(hwnd, IDC_KEYSSH2RSA), 0);
 686                 EnableWindow(GetDlgItem(hwnd, IDC_BITS), 0);
 687                 state->key_exists = FALSE;
 688                 SetDlgItemText(hwnd, IDC_GENERATING, entropy_msg);
 689                 state->collecting_entropy = TRUE;
 690
 691                 /*
 692                  * My brief statistical tests on mouse movements
 693                  * suggest that there are about 2.5 bits of
 694                  * randomness in the x position, 2.5 in the y
 695                  * position, and 1.7 in the message time, making
 696                  * 5.7 bits of unpredictability per mouse movement.
 697                  * However, other people have told me it's far less
 698                  * than that, so I'm going to be stupidly cautious
 699                  * and knock that down to a nice round 2. With this
 700                  * method, we require two words per mouse movement,
 701                  * so with 2 bits per mouse movement we expect 2
 702                  * bits every 2 words.
 703                  */
 704                 state->entropy_required = (state->keysize / 2) * 2;
 705                 state->entropy_got = 0;
 706                 state->entropy_size = (state->entropy_required *
 707                                        sizeof(*state->entropy));
 708                 state->entropy = smalloc(state->entropy_size);
 709
 710                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
 711                                    MAKELPARAM(0, state->entropy_required));
 712                 SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, 0, 0);
 713             }
 714             break;
 715           case IDC_SAVE:
 716             state =
 717                 (struct MainDlgState *) GetWindowLong(hwnd, GWL_USERDATA);
 718             if (state->key_exists) {
 719                 char filename[FILENAME_MAX];
 720                 char passphrase[PASSPHRASE_MAXLEN];
 721                 char passphrase2[PASSPHRASE_MAXLEN];
 722                 GetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT,
 723                                passphrase, sizeof(passphrase));
 724                 GetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT,
 725                                passphrase2, sizeof(passphrase2));
 726                 if (strcmp(passphrase, passphrase2)) {
 727                     MessageBox(hwnd,
 728                                "The two passphrases given do not match.",
 729                                "PuTTYgen Error", MB_OK | MB_ICONERROR);
 730                     break;
 731                 }
 732                 if (!*passphrase) {
 733                     int ret;
 734                     ret = MessageBox(hwnd,
 735                                      "Are you sure you want to save this key\n"
 736                                      "without a passphrase to protect it?",
 737                                      "PuTTYgen Warning",
 738                                      MB_YESNO | MB_ICONWARNING);
 739                     if (ret != IDYES)
 740                         break;
 741                 }
 742                 if (prompt_keyfile(hwnd, "Save private key as:",
 743                                    filename, 1)) {
 744                     int ret;
 745                     FILE *fp = fopen(filename, "r");
 746                     if (fp) {
 747                         char buffer[FILENAME_MAX + 80];
 748                         fclose(fp);
 749                         sprintf(buffer, "Overwrite existing file\n%.*s?",
 750                                 FILENAME_MAX, filename);
 751                         ret = MessageBox(hwnd, buffer, "PuTTYgen Warning",
 752                                          MB_YESNO | MB_ICONWARNING);
 753                         if (ret != IDYES)
 754                             break;
 755                     }
 756                     if (state->ssh2) {
 757                         ret = ssh2_save_userkey(filename, &state->ssh2key,
 758                                                 *passphrase ? passphrase :
 759                                                 NULL);
 760                     } else {
 761                         ret = saversakey(filename, &state->key,
 762                                          *passphrase ? passphrase : NULL);
 763                     }
 764                     if (ret <= 0) {
 765                         MessageBox(hwnd, "Unable to save key file",
 766                                    "PuTTYgen Error", MB_OK | MB_ICONERROR);
 767                     }
 768                 }
 769             }
 770             break;
 771           case IDC_SAVEPUB:
 772             state =
 773                 (struct MainDlgState *) GetWindowLong(hwnd, GWL_USERDATA);
 774             if (state->key_exists) {
 775                 char filename[FILENAME_MAX];
 776                 if (prompt_keyfile(hwnd, "Save public key as:",
 777                                    filename, 1)) {
 778                     int ret;
 779                     FILE *fp = fopen(filename, "r");
 780                     if (fp) {
 781                         char buffer[FILENAME_MAX + 80];
 782                         fclose(fp);
 783                         sprintf(buffer, "Overwrite existing file\n%.*s?",
 784                                 FILENAME_MAX, filename);
 785                         ret = MessageBox(hwnd, buffer, "PuTTYgen Warning",
 786                                          MB_YESNO | MB_ICONWARNING);
 787                         if (ret != IDYES)
 788                             break;
 789                     }
 790                     if (state->ssh2) {
 791                         ret = save_ssh2_pubkey(filename, &state->ssh2key);
 792                     } else {
 793                         ret = save_ssh1_pubkey(filename, &state->key);
 794                     }
 795                     if (ret <= 0) {
 796                         MessageBox(hwnd, "Unable to save key file",
 797                                    "PuTTYgen Error", MB_OK | MB_ICONERROR);
 798                     }
 799                 }
 800             }
 801             break;
 802           case IDC_LOAD:
 803             state =
 804                 (struct MainDlgState *) GetWindowLong(hwnd, GWL_USERDATA);
 805             if (!state->generation_thread_exists) {
 806                 char filename[FILENAME_MAX];
 807                 if (prompt_keyfile(hwnd, "Load private key:", filename, 0)) {
 808                     char passphrase[PASSPHRASE_MAXLEN];
 809                     int needs_pass;
 810                     int ver;
 811                     int ret;
 812                     char *comment;
 813                     struct PassphraseProcStruct pps;
 814                     struct RSAKey newkey1;
 815                     struct ssh2_userkey *newkey2 = NULL;
 816
 817                     ver = keyfile_version(filename);
 818                     if (ver == 0) {
 819                         MessageBox(NULL, "Couldn't load private key.",
 820                                    "PuTTYgen Error", MB_OK | MB_ICONERROR);
 821                         break;
 822                     }
 823
 824                     comment = NULL;
 825                     if (ver == 1)
 826                         needs_pass = rsakey_encrypted(filename, &comment);
 827                     else
 828                         needs_pass =
 829                             ssh2_userkey_encrypted(filename, &comment);
 830                     pps.passphrase = passphrase;
 831                     pps.comment = comment;
 832                     do {
 833                         if (needs_pass) {
 834                             int dlgret;
 835                             dlgret = DialogBoxParam(hinst,
 836                                                     MAKEINTRESOURCE(210),
 837                                                     NULL, PassphraseProc,
 838                                                     (LPARAM) & pps);
 839                             if (!dlgret) {
 840                                 ret = -2;
 841                                 break;
 842                             }
 843                         } else
 844                             *passphrase = '\0';
 845                         if (ver == 1)
 846                             ret =
 847                                 loadrsakey(filename, &newkey1, passphrase);
 848                         else {
 849                             newkey2 =
 850                                 ssh2_load_userkey(filename, passphrase);
 851                             if (newkey2 == SSH2_WRONG_PASSPHRASE)
 852                                 ret = -1;
 853                             else if (!newkey2)
 854                                 ret = 0;
 855                             else
 856                                 ret = 1;
 857                         }
 858                     } while (ret == -1);
 859                     if (comment)
 860                         sfree(comment);
 861                     if (ret == 0) {
 862                         MessageBox(NULL, "Couldn't load private key.",
 863                                    "PuTTYgen Error", MB_OK | MB_ICONERROR);
 864                     } else if (ret == 1) {
 865                         EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 1);
 866                         EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 1);
 867                         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 1);
 868                         EnableWindow(GetDlgItem(hwnd, IDC_SAVEPUB), 1);
 869                         EnableWindow(GetDlgItem(hwnd, IDC_KEYSSH1), 1);
 870                         EnableWindow(GetDlgItem(hwnd, IDC_KEYSSH2RSA), 1);
 871                         EnableWindow(GetDlgItem(hwnd, IDC_BITS), 1);
 872                         /*
 873                          * Now update the key controls with all the
 874                          * key data.
 875                          */
 876                         {
 877                             SetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT,
 878                                            passphrase);
 879                             SetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT,
 880                                            passphrase);
 881                             if (ver == 1) {
 882                                 char buf[128];
 883                                 char *savecomment;
 884
 885                                 state->ssh2 = FALSE;
 886                                 state->commentptr = &state->key.comment;
 887                                 state->key = newkey1;
 888
 889                                 /*
 890                                  * Set the key fingerprint.
 891                                  */
 892                                 savecomment = state->key.comment;
 893                                 state->key.comment = NULL;
 894                                 rsa_fingerprint(buf, sizeof(buf),
 895                                                 &state->key);
 896                                 state->key.comment = savecomment;
 897
 898                                 SetDlgItemText(hwnd, IDC_FINGERPRINT, buf);
 899                                 /*
 900                                  * Construct a decimal representation
 901                                  * of the key, for pasting into
 902                                  * .ssh/authorized_keys on a Unix box.
 903                                  */
 904                                 setupbigedit1(hwnd, IDC_KEYDISPLAY,
 905                                               IDC_PKSTATIC, &state->key);
 906                             } else {
 907                                 char *fp;
 908                                 char *savecomment;
 909
 910                                 state->ssh2 = TRUE;
 911                                 state->commentptr =
 912                                     &state->ssh2key.comment;
 913                                 state->ssh2key = *newkey2;      /* structure copy */
 914                                 sfree(newkey2);
 915
 916                                 savecomment = state->ssh2key.comment;
 917                                 state->ssh2key.comment = NULL;
 918                                 fp =
 919                                     state->ssh2key.alg->
 920                                     fingerprint(state->ssh2key.data);
 921                                 state->ssh2key.comment = savecomment;
 922
 923                                 SetDlgItemText(hwnd, IDC_FINGERPRINT, fp);
 924                                 sfree(fp);
 925
 926                                 setupbigedit2(hwnd, IDC_KEYDISPLAY,
 927                                               IDC_PKSTATIC, &state->ssh2key);
 928                             }
 929                             SetDlgItemText(hwnd, IDC_COMMENTEDIT,
 930                                            *state->commentptr);
 931                         }
 932                         /*
 933                          * Finally, hide the progress bar and show
 934                          * the key data.
 935                          */
 936                         hidemany(hwnd, nokey_ids, TRUE);
 937                         hidemany(hwnd, generating_ids, TRUE);
 938                         hidemany(hwnd, gotkey_ids, FALSE);
 939                         state->key_exists = TRUE;
 940                     }
 941                 }
 942             }
 943             break;
 944         }
 945         return 0;
 946       case WM_DONEKEY:
 947         state = (struct MainDlgState *) GetWindowLong(hwnd, GWL_USERDATA);
 948         state->generation_thread_exists = FALSE;
 949         state->key_exists = TRUE;
 950         SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
 951                            MAKELPARAM(0, PROGRESSRANGE));
 952         SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, PROGRESSRANGE, 0);
 953         EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 1);
 954         EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 1);
 955         EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 1);
 956         EnableWindow(GetDlgItem(hwnd, IDC_SAVEPUB), 1);
 957         EnableWindow(GetDlgItem(hwnd, IDC_KEYSSH1), 1);
 958         EnableWindow(GetDlgItem(hwnd, IDC_KEYSSH2RSA), 1);
 959         EnableWindow(GetDlgItem(hwnd, IDC_BITS), 1);
 960         if (state->ssh2) {
 961             if (state->is_dsa) {
 962                 state->ssh2key.data = &state->dsskey;
 963                 state->ssh2key.alg = &ssh_dss;
 964             } else {
 965                 state->ssh2key.data = &state->key;
 966                 state->ssh2key.alg = &ssh_rsa;
 967             }
 968             state->commentptr = &state->ssh2key.comment;
 969         } else {
 970             state->commentptr = &state->key.comment;
 971         }
 972         /*
 973          * Invent a comment for the key. We'll do this by including
 974          * the date in it. This will be so horrifyingly ugly that
 975          * the user will immediately want to change it, which is
 976          * what we want :-)
 977          */
 978         *state->commentptr = smalloc(30);
 979         {
 980             time_t t;
 981             struct tm *tm;
 982             time(&t);
 983             tm = localtime(&t);
 984             if (state->is_dsa)
 985                 strftime(*state->commentptr, 30, "dsa-key-%Y%m%d", tm);
 986             else
 987                 strftime(*state->commentptr, 30, "rsa-key-%Y%m%d", tm);
 988         }
 989
 990         /*
 991          * Now update the key controls with all the key data.
 992          */
 993         {
 994             char *savecomment;
 995             /*
 996              * Blank passphrase, initially. This isn't dangerous,
 997              * because we will warn (Are You Sure?) before allowing
 998              * the user to save an unprotected private key.
 999              */
1000             SetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT, "");
1001             SetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT, "");
1002             /*
1003              * Set the comment.
1004              */
1005             SetDlgItemText(hwnd, IDC_COMMENTEDIT, *state->commentptr);
1006             /*
1007              * Set the key fingerprint.
1008              */
1009             savecomment = *state->commentptr;
1010             *state->commentptr = NULL;
1011             if (state->ssh2) {
1012                 char *fp;
1013                 fp = state->ssh2key.alg->fingerprint(state->ssh2key.data);
1014                 SetDlgItemText(hwnd, IDC_FINGERPRINT, fp);
1015                 sfree(fp);
1016             } else {
1017                 char buf[128];
1018                 rsa_fingerprint(buf, sizeof(buf), &state->key);
1019                 SetDlgItemText(hwnd, IDC_FINGERPRINT, buf);
1020             }
1021             *state->commentptr = savecomment;
1022             /*
1023              * Construct a decimal representation of the key, for
1024              * pasting into .ssh/authorized_keys or
1025              * .ssh/authorized_keys2 on a Unix box.
1026              */
1027             if (state->ssh2) {
1028                 setupbigedit2(hwnd, IDC_KEYDISPLAY,
1029                               IDC_PKSTATIC, &state->ssh2key);
1030             } else {
1031                 setupbigedit1(hwnd, IDC_KEYDISPLAY,
1032                               IDC_PKSTATIC, &state->key);
1033             }
1034         }
1035         /*
1036          * Finally, hide the progress bar and show the key data.
1037          */
1038         hidemany(hwnd, nokey_ids, TRUE);
1039         hidemany(hwnd, generating_ids, TRUE);
1040         hidemany(hwnd, gotkey_ids, FALSE);
1041         break;
1042       case WM_CLOSE:
1043         state = (struct MainDlgState *) GetWindowLong(hwnd, GWL_USERDATA);
1044         sfree(state);
1045         EndDialog(hwnd, 1);
1046         return 0;
1047     }
1048     return 0;
1049 }
1050
1051 int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show)
1052 {
1053     InitCommonControls();
1054     hinst = inst;
1055     random_init();
1056     return DialogBox(hinst, MAKEINTRESOURCE(201), NULL,
1057                      MainDlgProc) != IDOK;
1058 }