/[winpt]/trunk/Src/wptPassphraseCB.cpp

Diff of /trunk/Src/wptPassphraseCB.cpp

Parent Directory | Revision Log | View Patch Patch

-revision 2 by twoaday,
Mon Jan 31 11:02:21 2005 UTC
+revision 48 by werner,
Mon Oct 31 21:14:11 2005 UTC
 Line 1
  /* wptPassphraseCB.cpp - GPGME Passphrase Callback
-  *      Copyright (C) 2001, 2002, 2003 Timo Schulz
+  *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz
-  *
+  *      Copyright (C) 2005 g10 Code GmbH
-  * This file is part of WinPT.
+  *
-  *
+  * This file is part of WinPT.
-  * WinPT is free software; you can redistribute it and/or
+  *
-  * modify it under the terms of the GNU General Public License
+  * WinPT is free software; you can redistribute it and/or
-  * as published by the Free Software Foundation; either version 2
+  * modify it under the terms of the GNU General Public License
-  * of the License, or (at your option) any later version.
+  * as published by the Free Software Foundation; either version 2
-  *
+  * of the License, or (at your option) any later version.
-  * WinPT is distributed in the hope that it will be useful,
+  *
-  * but WITHOUT ANY WARRANTY; without even the implied warranty of
+  * WinPT is distributed in the hope that it will be useful,
-  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  * but WITHOUT ANY WARRANTY; without even the implied warranty of
-  * General Public License for more details.
+  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-  *
+  * General Public License for more details.
-  * You should have received a copy of the GNU General Public License
+  *
-  * along with WinPT; if not, write to the Free Software Foundation,
+  * You should have received a copy of the GNU General Public License
-  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+  * along with WinPT; if not, write to the Free Software Foundation,
-  */
+  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+  */
- #include <windows.h>
- #include <ctype.h>
+ #ifdef HAVE_CONFIG_H
+ #include <config.h>
- #include "../resource.h"
+ #endif
- #include "wptNLS.h"
- #include "wptW32API.h"
+ #include <windows.h>
- #include "wptVersion.h"
+ #include <ctype.h>
- #include "wptGPG.h"
- #include "wptCommonCtl.h"
+ #include "resource.h"
- #include "wptContext.h"
+ #include "wptNLS.h"
- #include "wptDlgs.h"
+ #include "wptW32API.h"
- #include "wptUTF8.h"
+ #include "wptVersion.h"
- #include "wptErrors.h"
+ #include "wptGPG.h"
- #include "wptTypes.h"
+ #include "wptCommonCtl.h"
- #include "wptAgent.h"
+ #include "wptContext.h"
- #include "wptRegistry.h"
+ #include "wptDlgs.h"
+ #include "wptUTF8.h"
+ #include "wptErrors.h"
- #define item_ctrl_id( cmd ) \
+ #include "wptTypes.h"
-     ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
+ #include "wptKeylist.h"
+ #include "wptAgent.h"
+ #include "wptRegistry.h"
- BOOL CALLBACK
- passphrase_callback_proc( HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam )
- {
-     static passphrase_cb_s * c;
+ const char* get_symkey_algo (int algo);
-     static int yes = 1;
-     gpgme_key_t key;
+ #define item_ctrl_id( cmd ) \
-     const char * s, * id;
+     ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
-     char info[768] = {0};
-     void * ctx = NULL, * item;
+ #define item_ctrl_id2(cmd) \
-     unsigned int pkalgo;
+     ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
-     switch( msg )  {
-     case WM_INITDIALOG:
+ /* Overwrite passphrase and free memory. */
-         c = (passphrase_cb_s *)lparam;
+ static void
-         if( !c )
+ burn_passphrase (char **pwd)
-             BUG( NULL );
+ {
-         SetWindowText( dlg, c->title );
+     char *pass = *pwd;
-         if( c->gpg_cmd == GPG_CMD_DECRYPT ) {
+     wipememory (pass, strlen (pass));
-             SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,
+     delete []pass;
-                 _("Encrypted with the following public key(s)") );
+     *pwd = NULL;
-             CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );
+ }
-         }
-         else if( c->gpg_cmd == GPG_CMD_SIGN )
-             CheckDlgButton( dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED );
+ /* Dialog procedure for the passphrase callback. */
-         if( c->enc_to && c->gpg_cmd == GPG_CMD_DECRYPT ) {
+ static BOOL CALLBACK
-             gpgme_recipients_enum_open( c->enc_to, &ctx );
+ passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
-             while ( (s = gpgme_recipients_enum_read( c->enc_to, &ctx )) ) {
+ {
-                 pkalgo = *s; s++;
+     static passphrase_cb_s * c;
-                 get_pubkey( s, &key );
+     gpgme_decrypt_result_t res;
-                 if( key ) {
+     gpgme_sign_result_t res_sig;
-                     char * uid = NULL;
+     gpgme_key_t key;
-                     id = gpgme_key_get_string_attr( key, GPGME_ATTR_USERID, NULL, 0 );
+     gpgme_recipient_t recip, r;
-                     if( !id )
+     void *ctx = NULL, *item;
-                         id = _("Invalid User ID");
+     const char *id;
-                     uid = utf8_to_wincp (id, strlen (id));
+     char *info;
-                     _snprintf( info, sizeof info - 1, "%s (%s, 0x%s)", uid,
+     int n;
-                                 gpgme_key_expand_attr( GPGME_ATTR_ALGO, pkalgo ), s+8 );
-                     free( uid );
+     switch (msg) {
-                 }
+     case WM_INITDIALOG:
-                 else
+         c = (passphrase_cb_s *)lparam;
-                     _snprintf( info, sizeof info - 1, _("Unknown (key ID 0x%s)"),
+         if (!c)
-                                s? s + 8 : "DEADBEEF" );
+             BUG (0);
-                 listbox_add_string( GetDlgItem( dlg, IDC_DECRYPT_LIST ), info );
+         SetWindowText (dlg, c->title);
-             }
+         if (c->gpg_cmd == GPG_CMD_DECRYPT) {
-             gpgme_recipients_enum_close( c->enc_to, &ctx );
+             SetDlgItemText (dlg, IDC_DECRYPT_LISTINF,
-         }
+                             _("Encrypted with the following public key(s)"));
-         SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
+             CheckDlgButton (dlg, IDC_DECRYPT_HIDE, BST_CHECKED);
-                         IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
+         }
-                         _("Please enter your passphrase") );
+         else if (c->gpg_cmd == GPG_CMD_SIGN)
-         if( c->gpg_cmd == GPG_CMD_DECRYPT ) {
+             CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
-             SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );
+         if (c->recipients)
-             SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );
+             recip = c->recipients; /* recipients were already extracted. */
-         }
+         else {
-         else {
+             /* XXX: not all ENCRYPT_TO entries are listed here. */
-             SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );
+             res = gpgme_op_decrypt_result (c->gpg);
-             SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );
+             if (res && res->recipients)
-         }
+                 recip = res->recipients;
-         center_window( dlg );
+         }
-         SetForegroundWindow( dlg );
+         if (recip != NULL && c->gpg_cmd == GPG_CMD_DECRYPT) {
-         set_active_window( dlg );
+             for (r = res->recipients; r; r = r->next) {
-         return FALSE;
+                 get_pubkey (r->keyid, &key);
+                 if (key) {
-         case WM_SYSCOMMAND:
+                     char *uid;
-             if( LOWORD( wparam ) == SC_CLOSE ) {
+                     id = key->uids->name;
-                 SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );
+                     if (!id)
-                 c->cancel = 1;
+                         id = _("Invalid User ID");
-                 EndDialog( dlg, TRUE );
+                     uid = utf8_to_wincp (id, strlen (id));
-             }
+                     info = new char [32+strlen (uid)+1 + 4 + strlen (r->keyid)+1
-             return FALSE;
+                                      + strlen (key->uids->email)+1];
+                     if (!info)
-         case WM_COMMAND:
+                         BUG (NULL);
-             switch( HIWORD( wparam ) ) {
+                     sprintf (info, "%s <%s> (%s, 0x%s)", uid, key->uids->email,
-             case BN_CLICKED:
+                              get_key_pubalgo (r->pubkey_algo), r->keyid+8);
-                 if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE
+                     free (uid);
-                     || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {
-                     HWND hwnd;
+                 }
-                     yes ^= 1;
+                 else {
-                     hwnd = GetDlgItem( dlg, item_ctrl_id( c->gpg_cmd ) );
+                     info = new char [32 + strlen (r->keyid)+1 + 4];
-                     SendMessage( hwnd, EM_SETPASSWORDCHAR, yes? '*' : 0, 0 );
+                     if (!info)
-                     SetFocus( hwnd );
+                         BUG (NULL);
-                 }
+                     sprintf (info, _("Unknown key ID (%s, 0x%s)"),
-             }
+                              get_key_pubalgo (r->pubkey_algo), r->keyid+8);
+                 }
-             switch( LOWORD( wparam ) ) {
+                 listbox_add_string (GetDlgItem (dlg, IDC_DECRYPT_LIST), info);
-             case IDOK:
+                 free_if_alloc (info);
-                 /* fixme: the item is even cached when the passphrase is not
+             }
-                           correct, which means that the user needs to delete all
+         }
-                           cached entries to continue. */
+         else if (c->gpg_cmd == GPG_CMD_DECRYPT)
-                 GetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), c->pwd, sizeof c->pwd -1 );
+             EnableWindow (GetDlgItem (dlg, IDC_DECRYPT_LIST), FALSE);
-                 if( reg_prefs.cache_time > 0 && !c->is_card ) {
+         SetDlgItemText (dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
-                     if( agent_get_cache( c->keyid, &item ) )
+                         IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
-                         agent_unlock_cache_entry( &item );
+                         c->bad_pwd? _("Bad passphrase; Enter passphrase again") :
-                     else
+                         _("Please enter your passphrase"));
-                         agent_put_cache( c->keyid, c->pwd, reg_prefs.cache_time );
+         if (c->gpg_cmd == GPG_CMD_DECRYPT) {
-                 }
+             SetFocus (GetDlgItem (dlg, IDC_DECRYPT_PWD));
-                 EndDialog( dlg, TRUE );
+             if (res && !res->recipients) {
-                 return TRUE;
+                 const char *s = _("Symmetric encryption.\n"
+                                   "%s encrypted data.");
-             case IDCANCEL:
+                 const char *alg = get_symkey_algo (c->sym.sym_algo);
-                 SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), ""  );
+                 info = new char[strlen (s) + strlen (alg) + 2];
-                 c->cancel = 1;
+                 if (!info)
-                 EndDialog( dlg, FALSE );
+                     BUG (NULL);
-                 return FALSE;
+                 sprintf (info, s, alg);
-             }
+                 SetDlgItemText (dlg, IDC_DECRYPT_MSG, info);
-             break;
+                 free_if_alloc (info);
-     }
+             }
+             else
-     return FALSE;
+                 SetDlgItemText (dlg, IDC_DECRYPT_MSG, c->info);
- } /* passphrase_callback_proc */
+         }
+         else {
+             SetFocus( GetDlgItem (dlg, IDC_DECRYPT_SIGN_PWD));
- static const char *
+             SetDlgItemText (dlg, IDC_DECRYPT_SIGN_MSG, c->info);
- parse_gpg_keyid( const char * desc )
+         }
- {
+         center_window (dlg, NULL);
-     static char keyid[16+1];
+         SetForegroundWindow (dlg);
-     char * p;
+         set_active_window (dlg);
+         return FALSE;
-     p = strrchr( desc, '\n' );
-     if( !p )
+         case WM_SYSCOMMAND:
-         return NULL;
+             if (LOWORD (wparam) == SC_CLOSE) {
-     /* the format of the desc buffer looks like this:
+                 SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
-        request_keyid[16] main_keyid[16] keytype[1] keylength[4]
+                 c->cancel = 1;
-        we use the main keyid to use only one cache entry. */
+                 EndDialog (dlg, TRUE);
-     strncpy( keyid, desc+(p-desc+1+17), 16 );
+             }
-     return keyid;
+             break;
- } /* parse_gpg_keyid */
+         case WM_COMMAND:
+             switch (HIWORD (wparam)) {
- static void
+             case BN_CLICKED:
- parse_gpg_description( char * desc, int size )
+                 if  (LOWORD (wparam) == IDC_DECRYPT_HIDE
- {
+                     || LOWORD (wparam) == IDC_DECRYPT_SIGN_HIDE) {
-     char * buffer = NULL, ch, uid[128] = {0}, * uid2 = NULL;
+                     HWND hwnd;
-     char usedkey[16+1] = {0}, mainkey[16+1] = {0};
+                     int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
-     const char * buf;
+                     hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
-     int i, algo, try_again = 0;
+                     SendMessage (hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0);
+                     SetFocus (hwnd);
-     if( stristr( desc, "[User ID hint missing]" )
+                 }
-         || stristr( desc, "[passphrase info missing]" ) ) {
+             }
-         _snprintf( desc, size-1,
-                    _("You need a passphrase to unlock the secret key for\n"
+             switch (LOWORD (wparam)) {
-                      "user: [UserID hint missing]\n"
+             case IDOK:
-                      "      [passphrase info missing]\n") );
+                 /* XXX: the item is even cached when the passphrase is not
-         return;
+                         correct, which means that the user needs to delete all
-     }
+                         cached entries to continue. */
+                 if (c->pwd)
-     buffer = new char[size+1];
+                     burn_passphrase (&c->pwd);
-     if( !buffer )
+                 n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
-         BUG( NULL );
+                 if (!n) {
-     strcpy( buffer, desc );
+                     c->pwd = new char[2];
-     buf = buffer;
+                     if (!c->pwd)
-     if( strstr( buf, "TRY_AGAIN" ) ) {
+                         BUG (NULL);
-         buf += strlen( "TRY_AGAIN\n" );
+                     strcpy (c->pwd, "");
-         try_again = 1;
+                 }
-     }
+                 else {
-     else if( strstr( buf, "ENTER_PASSPHRASE" ) )
+                     c->pwd = new char[n+2];
-         buf += strlen( "ENTER_PASSPHRASE\n" );
+                     if (!c->pwd)
-     else
+                         BUG (NULL);
-         BUG( NULL );
+                     GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, n+1);
-     buf += 17;
+                 }
-     for( i = 0; i < sizeof uid-1; i++ ) {
+                 res = gpgme_op_decrypt_result (c->gpg);
-         ch = *buf++;
+                 if (!res)
-         if( ch == '\n' ) {
+                     res_sig = gpgme_op_sign_result (c->gpg);
-             uid[i] = '\0';
+                 if (reg_prefs.cache_time > 0 && !c->is_card &&
-             break;
+                     ((res && res->recipients) || (res_sig && res_sig->signatures))) {
-         }
+                     if (agent_get_cache (c->keyid, &item))
-         uid[i] = ch;
+                         agent_unlock_cache_entry (&item);
-     }
+                     else
-     memcpy( usedkey, buf, 16 );
+                         agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
-     usedkey[16] = '\0';
+                 }
-     buf += 17;
+                 c->cancel = 0;
-     memcpy( mainkey, buf, 16 );
+                 EndDialog (dlg, TRUE);
-     mainkey[16] = '\0';
+                 return TRUE;
-     buf += 17;
-     if( !buf )
+             case IDCANCEL:
-         BUG( NULL );
+                 SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "");
-     algo = atol( buf );
+                 c->cancel = 1;
-     free_if_alloc( buffer );
+                 EndDialog (dlg, FALSE);
+                 return FALSE;
-     uid2 = utf8_to_wincp (uid, strlen (uid));
+             }
+             break;
-     if( strcmp( usedkey, mainkey ) )
+     }
-         _snprintf( desc, size-1,
-                    _("You need a passphrase to unlock the secret key for\n"
+     return FALSE;
-                      "user: \"%s\"\n"
+ }
-                      "%s key, ID %s (main key ID %s)\n"),
-                    uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),
-                    usedkey+8, mainkey+8 );
+ /* Extract the main keyid from @pass_info.
-     else if( !strcmp( usedkey, mainkey ) )
+    Return value: long main keyid or NULL for an error. */
-         _snprintf( desc, size-1,
+ static const char*
-                    _("You need a passphrase to unlock the secret key for\n"
+ parse_gpg_keyid (const char *pass_info)
-                      "user: \"%s\"\n"
+ {
-                      "%s key, ID %s\n"),
+     static char keyid[16+1];
-                      uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),
-                      usedkey+8 );
+     /* XXX: check for leading alpha-chars? */
-     free( uid2 );
+     if (strlen (pass_info) < 16)
- } /* parse_gpg_describtion */
+         return NULL;
+     /* the format of the desc buffer looks like this:
+        request_keyid[16] main_keyid[16] keytype[1] keylength[4]
- static int inline
+        we use the main keyid to use only one cache entry. */
- is_hexstring( const char * p )
+     strncpy (keyid, pass_info+17, 16);
- {
+     keyid[16] = 0;
-     size_t i;
+     return keyid;
-     for( i=0; i < strlen( p ); i++ ) {
+ }
-         if( !isxdigit( p[i] ) )
-             return -1;
-     }
+ /* Parse the information in @uid_hint and @pass_info to generate
-     return 0;
+    a input message for the user in @desc. */
- }
+ static int
+ parse_gpg_description (const char *uid_hint, const char *pass_info,
+                        char *desc, int size)
- const char *
+ {
- passphrase_cb( void * opaque, const char * desc, void * r_hd )
+     gpgme_pubkey_algo_t algo;
- {
+     char usedkey[16+1];
-     passphrase_cb_s * c = (passphrase_cb_s *)opaque;
+     char mainkey[16+1];
-     void * item;
+     char *uid, *p;
-     const char * pass, * keyid;
+     int n=0;
-     int rc = 0;
+     /* Each uid_hint contains a long key-ID so it is at least 16 bytes. */
-     if( !c )
+     if (strlen (uid_hint) < 17) {
-         return NULL;
+         *desc = 0;
+         return -1;
-     if( desc ) {
+     }
-         keyid = parse_gpg_keyid( desc );
-         pass = agent_get_cache( keyid, &item );
+     while (p = strsep ((char**)&pass_info, " ")) {
-         if( pass ) {
+         switch (n++) {
-             agent_unlock_cache_entry( &item );
+         case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
-             c->pwd_init = 0;
+         case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
-             return pass;
+         case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
          }
      }
+     uid_hint += 16; /* skip keyid */
-     if( c->pwd_init ) {
+     uid_hint += 1;  /* space */
-         c->keyid = keyid;
-         /* if the desc has a length of 32 and only hex digits, we assume a
+     uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
-            smart card has been used. */
-         /*log_box( "", 0, "%s %d %d", desc,strlen( desc), is_hexstring( desc ) );*/
+     if (strcmp (usedkey, mainkey))
-         if( desc && strlen( desc ) == 32 && !is_hexstring( desc ) ) {
+         _snprintf (desc, size-1,
-             char buf[16];
+                    _("You need a passphrase to unlock the secret key for\n"
-             memset( buf, 0, sizeof buf );
+                      "user: \"%s\"\n"
-             strncpy( buf, desc+20, 8 );
+                      "%s key, ID %s (main key ID %s)\n"),
-             _snprintf( c->info, sizeof c->info-1,
+                    uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
-                     _("Please enter the PIN to unlock your secret card key\n"
+     else if (!strcmp (usedkey, mainkey))
-                       "Card: %s"), buf );
+         _snprintf (desc, size-1,
-             c->is_card = 1;
+                    _("You need a passphrase to unlock the secret key for\n"
-         }
+                      "user: \"%s\"\n"
-         else if( desc ) {
+                      "%s key, ID %s\n"),
-             strcpy( c->info, desc );
+                      uid, get_key_pubalgo (algo), usedkey+8);
-             parse_gpg_description( c->info, sizeof c->info - 1 );
+     free (uid);
-         }
+     return 0;
-         if( c->gpg_cmd == GPG_CMD_DECRYPT ) {
+ }
-             rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
-                                 (HWND)c->hwnd, passphrase_callback_proc,
-                                 (LPARAM)c );
+ /* Extract the serial number from the card ID @id and return it. */
-         }
+ const char*
-         else if( c->gpg_cmd == GPG_CMD_SIGN ) {
+ extract_serial_no (const char *id)
-             rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
+ {
-                                 (HWND)c->hwnd, passphrase_callback_proc,
+     static char buf[8];
-                                 (LPARAM)c );
+     char *p;
-         }
-         if( rc == -1 )
+     p = strchr (id, '/');
-             return NULL;
+     if (!p)
-         c->pwd_init = 0;
+         return NULL;
-     }
+     strncpy (buf, id+(p-id)-6, 6);
+     return buf;
-     if( c->cancel )
+ }
-         return NULL;
-     return c->pwd;
+ /* Passphrase callback with the ability to support caching. */
- } /* passphrase_cb */
+ gpgme_error_t
+ passphrase_cb (void *hook, const char *uid_hint,
+                const char *passphrase_info,
- void
+                int prev_was_bad, int fd)
- set_gpg_passphrase_cb( gpgme_ctx_t c, passphrase_cb_s * ctx, int cmd,
+ {
-                        HWND hwnd, const char * title )
+     passphrase_cb_s *c = (passphrase_cb_s*)hook;
- {
+     HANDLE hd = (HANDLE)fd;
-     ctx->gpg_cmd = cmd;
+     void *item;
-     ctx->is_card = 0;
+     const char *keyid, *pass;
-     ctx->cancel = 0;
+     DWORD n;
-     ctx->hwnd = hwnd;
+     int rc;
-     ctx->pwd_init = 1;
-     if( strlen( title ) > 256 )
+     if (!c)
-         BUG( NULL ); /* check bounds */
+         return gpg_error (GPG_ERR_INV_ARG);
-     strcpy( ctx->title, title );
+     c->bad_pwd = prev_was_bad? 1 : 0;
-     gpgme_set_passphrase_cb( c, passphrase_cb, ctx );
+     if (prev_was_bad && !c->cancel) {
- } /* set_gpg_passphrase_cb */
+         if (c->pwd)
+             burn_passphrase (&c->pwd);
+         agent_del_cache (c->keyid);
+         c->pwd_init = 1;
+     }
+     if (passphrase_info) {
+         if (strlen (passphrase_info) < 16 &&
+             !strstr (passphrase_info, "OPENPGP")) {
+             /* assume symetric encryption. */
+             int n=2;
+             c->sym.sym_algo = atoi (passphrase_info);
+             if (c->sym.sym_algo > 9)
+                 n++;
+             /* XXX: be more strict. */
+             c->sym.s2k_mode = atoi (passphrase_info+n);
+             c->sym.s2k_hash = atoi (passphrase_info+n+2);
+         }
+         keyid = parse_gpg_keyid (passphrase_info);
+         pass = agent_get_cache (keyid+8, &item);
+         if (pass) {
+             agent_unlock_cache_entry (&item);
+             c->pwd_init = 0;
+             if (!WriteFile (hd, pass, strlen (pass), &n, NULL))
+                 log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
+             if (!WriteFile (hd, "\n", 1, &n, NULL))
+                 log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
+             return 0;
+         }
+     }
+     if (c->pwd_init) {
+         if (keyid && strlen (keyid) == 16)
+             strcpy (c->keyid, keyid+8);
+         /* if @passphrase_info contains 'OPENPGP' we assume a smart card
+             has been used. */
+         if (strstr (passphrase_info, "OPENPGP")) {
+             const char *s=passphrase_info;
+             while (s && *s && *s != 'D')
+                 s++;
+             _snprintf (c->info, sizeof c->info-1,
+                        _("Please enter the PIN to unlock your secret card key\n"
+                          "Card: %s"), extract_serial_no (s));
+             c->is_card = 1;
+         }
+         else if (uid_hint)
+             parse_gpg_description (uid_hint, passphrase_info,
+                                    c->info, sizeof c->info - 1);
+         if (c->gpg_cmd == GPG_CMD_DECRYPT) {
+             rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
+                                  (HWND)c->hwnd, passphrase_callback_proc,
+                                  (LPARAM)c);
+         }
+         else if (c->gpg_cmd == GPG_CMD_SIGN) {
+             rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
+                                  (HWND)c->hwnd, passphrase_callback_proc,
+                                  (LPARAM)c);
+         }
+         if (rc == -1) {
+             if (!WriteFile (hd, "\n", 1, &n, NULL))
+                 log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
+             return 0;
+         }
+         c->pwd_init = 0;
+     }
+     if (c->cancel) {
+         if (!WriteFile (hd, "\n", 1, &n, NULL))
+             log_debug ("passphrase_cb: WriteFile() failed ec=%d\n", w32_errno);
+         return 0;
+     }
+     WriteFile (hd, c->pwd, strlen (c->pwd), &n, NULL);
+     WriteFile (hd, "\n", 1, &n, NULL);
+     return 0;
+ }
+ /* Initialize the given passphrase callback @cb with the
+    used gpgme context @ctx, the command @cmd and a title
+    @title for the dialog. */
+ void
+ set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
+                        int cmd, HWND hwnd, const char *title)
+ {
+     memset (cb, 0, sizeof *cb);
+     cb->gpg_cmd = cmd;
+     cb->bad_pwd = 0;
+     cb->is_card = 0;
+     cb->cancel = 0;
+     cb->hwnd = hwnd;
+     cb->pwd_init = 1;
+     free_if_alloc (cb->title);
+     cb->title = m_strdup (title);
+     if (!cb->title)
+         BUG (NULL);
+     gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
+     cb->gpg = ctx;
+ }
+ /* Release a passphrase callback @ctx. */
+ void
+ release_gpg_passphrase_cb (passphrase_cb_s *ctx)
+ {
+     gpgme_recipient_t r, n;
+     if (!ctx)
+         return;
+     sfree_if_alloc (ctx->pwd);
+     free_if_alloc (ctx->title);
+     r = ctx->recipients;
+     while (r) {
+         n = r->next;
+         safe_free (r->keyid);
+         safe_free (r);
+         r = n;
+     }
+ }
+ /* Simple check to measure passphrase (@pass) quality.
+    Return value: 0 on success. */
+ int
+ check_passwd_quality (const char *pass, int strict)
+ {
+     int i, nd=0, nc=0, n;
+     n = strlen (pass);
+     if (n < 8)
+         return -1;
+     for (i=0; i < n; i++) {
+         if (isdigit (pass[i]))
+             nd++;
+         if (isalpha (pass[i]))
+             nc++;
+     }
+     /* check that the passphrase contains letters and numbers. */
+     if (nd == n || nc == n)
+         return -1;
+     return 0;
+ }

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