trunk/Src/wptPassphraseCB.cpp

/* wptPassphraseCB.cpp - GPGME Passphrase Callback
 *      Copyright (C) 2001, 2002, 2003 Timo Schulz
 *
 * 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 
 * 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
 * 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, 
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 */

#include <windows.h>
#include <ctype.h>

#include "../resource.h"
#include "wptNLS.h"
#include "wptW32API.h"
#include "wptVersion.h"
#include "wptGPG.h"
#include "wptCommonCtl.h"
#include "wptContext.h"
#include "wptDlgs.h"
#include "wptUTF8.h"
#include "wptErrors.h"
#include "wptTypes.h"
#include "wptAgent.h"
#include "wptRegistry.h"


#define item_ctrl_id( cmd ) \
    ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)

#define item_ctrl_id2(cmd) \
    ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)


BOOL CALLBACK
passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
{    
    static passphrase_cb_s * c;
    gpgme_key_t key;
    const char * s, * id;
    char info[768] = {0};
    void * ctx = NULL, * item;
    unsigned int pkalgo;

    switch( msg )  {
    case WM_INITDIALOG:
        c = (passphrase_cb_s *)lparam;
        if (!c)
            BUG (0);
        SetWindowText (dlg, c->title);
        if (c->gpg_cmd == GPG_CMD_DECRYPT) {
            SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,
                _("Encrypted with the following public key(s)") );
            CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );
        }
        else if( c->gpg_cmd == GPG_CMD_SIGN )
            CheckDlgButton( dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED );
        if( c->enc_to && c->gpg_cmd == GPG_CMD_DECRYPT ) {
            gpgme_recipients_enum_open( c->enc_to, &ctx );
            while ( (s = gpgme_recipients_enum_read( c->enc_to, &ctx )) ) {
                pkalgo = *s; s++;
                get_pubkey( s, &key );
                if( key ) {
                    char * uid = NULL;
                    id = gpgme_key_get_string_attr( key, GPGME_ATTR_USERID, NULL, 0 );
                    if( !id )
                        id = _("Invalid User ID");
                    uid = utf8_to_wincp (id, strlen (id));                 
                    _snprintf( info, sizeof info - 1, "%s (%s, 0x%s)", uid,
                                gpgme_key_expand_attr( GPGME_ATTR_ALGO, pkalgo ), s+8 );
                    free( uid );
                }
                else
                    _snprintf( info, sizeof info - 1, _("Unknown (key ID 0x%s)"),
                               s? s + 8 : "DEADBEEF" );
                listbox_add_string( GetDlgItem( dlg, IDC_DECRYPT_LIST ), info );
            }
            gpgme_recipients_enum_close( c->enc_to, &ctx );
        }
        SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
                        IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
                        _("Please enter your passphrase") );
        if( c->gpg_cmd == GPG_CMD_DECRYPT ) {
            SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );
            SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );
        }
        else {
            SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );
            SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );
        }
        center_window( dlg );
        SetForegroundWindow( dlg );
        set_active_window( dlg );
        return FALSE;

        case WM_SYSCOMMAND:
            if( LOWORD( wparam ) == SC_CLOSE ) {
                SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );
                c->cancel = 1;
                EndDialog( dlg, TRUE );
            }
            return FALSE;

        case WM_COMMAND:
            switch( HIWORD( wparam ) ) {
            case BN_CLICKED:
                if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE
                    || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {
                    HWND hwnd;
                    int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
                    hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
                    SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );
                    SetFocus (hwnd);
                }
            }

            switch (LOWORD (wparam)) {
            case IDOK:  
                /* 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. */
                GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, sizeof (c->pwd) -1);
                if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) {
                    if (agent_get_cache (c->keyid, &item))
                        agent_unlock_cache_entry (&item);
                    else
                        agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
                }
                EndDialog (dlg, TRUE);
                return TRUE;
                
            case IDCANCEL:
                SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );
                c->cancel = 1;
                EndDialog (dlg, FALSE);
                return FALSE;
            }
            break;
    }
    
    return FALSE;
} /* passphrase_callback_proc */


static const char *
parse_gpg_keyid (const char * desc)
{
    static char keyid[16+1];
    char * p;
    
    p = strrchr (desc, '\n');
    if( !p )
        return NULL;
    /* the format of the desc buffer looks like this:
       request_keyid[16] main_keyid[16] keytype[1] keylength[4]
       we use the main keyid to use only one cache entry. */
    strncpy (keyid, desc+(p-desc+1+17), 16);
    return keyid;
} /* parse_gpg_keyid */


static void
parse_gpg_description( char * desc, int size )
{
    char * buffer = NULL, ch, uid[128] = {0}, * uid2 = NULL;
    char usedkey[16+1] = {0}, mainkey[16+1] = {0};
    const char * buf;
    int i, algo, try_again = 0;

    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"
                     "user: [UserID hint missing]\n"
                     "      [passphrase info missing]\n") );
        return;
    }

    buffer = new char[size+1];
    if( !buffer )
        BUG( NULL );
    strcpy( buffer, desc );
    buf = buffer;
    if( strstr( buf, "TRY_AGAIN" ) ) {
        buf += strlen( "TRY_AGAIN\n" );
        try_again = 1;
    }
    else if( strstr( buf, "ENTER_PASSPHRASE" ) )
        buf += strlen( "ENTER_PASSPHRASE\n" );
    else
        BUG( NULL );
    buf += 17;
    for( i = 0; i < sizeof uid-1; i++ ) {
        ch = *buf++;
        if( ch == '\n' ) {
            uid[i] = '\0';
            break;
        }
        uid[i] = ch;
    }
    memcpy( usedkey, buf, 16 );
    usedkey[16] = '\0';
    buf += 17;
    memcpy( mainkey, buf, 16 );
    mainkey[16] = '\0';
    buf += 17;
    if( !buf )
        BUG( NULL );
    algo = atol( buf );
    free_if_alloc( buffer );

    uid2 = utf8_to_wincp (uid, strlen (uid));

    if( strcmp( usedkey, mainkey ) )
        _snprintf( desc, size-1, 
                   _("You need a passphrase to unlock the secret key for\n"
                     "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 );
    else if( !strcmp( usedkey, mainkey ) )
        _snprintf( desc, size-1, 
                   _("You need a passphrase to unlock the secret key for\n"
                     "user: \"%s\"\n"
                     "%s key, ID %s\n"),
                     uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),
                     usedkey+8 );
    free( uid2 );
} /* parse_gpg_describtion */


static int inline
is_hexstring( const char * p )
{
    size_t i;
    for( i=0; i < strlen( p ); i++ ) {
        if( !isxdigit( p[i] ) )
            return -1;
    }
    return 0;
}


const char *
passphrase_cb( void * opaque, const char * desc, void * r_hd )
{   
    passphrase_cb_s * c = (passphrase_cb_s *)opaque;
    void * item;
    const char * pass, * keyid;
    int rc = 0;

    if( !c )
        return NULL;

    if( desc ) {
        keyid = parse_gpg_keyid (desc);
        pass = agent_get_cache( keyid, &item );
        if( pass ) {
            agent_unlock_cache_entry( &item );
            c->pwd_init = 0;
            return pass;
        }
    }

    if( c->pwd_init ) {
        c->keyid = keyid;
        /* if the desc has a length of 32 and only hex digits, we assume a 
           smart card has been used. */ 
        /*log_box( "", 0, "%s %d %d", desc,strlen( desc), is_hexstring( desc ) );*/
        if( desc && strlen( desc ) == 32 && !is_hexstring( desc ) ) {
            char buf[16];
            memset( buf, 0, sizeof buf );
            strncpy( buf, desc+20, 8 );
            _snprintf( c->info, sizeof c->info-1,
                    _("Please enter the PIN to unlock your secret card key\n"
                      "Card: %s"), buf );
            c->is_card = 1;
        }
        else if(desc) {
            strcpy (c->info, desc);
            parse_gpg_description (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 )
            return NULL;
        c->pwd_init = 0;
    }

    if( c->cancel )
        return NULL;

    return c->pwd;
} /* passphrase_cb */


void
set_gpg_passphrase_cb (gpgme_ctx_t c, passphrase_cb_s *ctx, int cmd,
                       HWND hwnd, const char *title)
{
    ctx->gpg_cmd = cmd;
    ctx->is_card = 0;
    ctx->cancel = 0;
    ctx->hwnd = hwnd;
    ctx->pwd_init = 1;
    if (strlen (title) > 256)
        BUG (NULL); /* check bounds */
    strcpy (ctx->title, title);
    gpgme_set_passphrase_cb (c, passphrase_cb, ctx);
} /* set_gpg_passphrase_cb */


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++;
    }

    if (nd == n || nc == n)
        return -1;

    return 0;
}
1	twoaday	2	/* wptPassphraseCB.cpp - GPGME Passphrase Callback
2			* Copyright (C) 2001, 2002, 2003 Timo Schulz
3			*
4			* This file is part of WinPT.
5			*
6			* WinPT is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU General Public License
8			* as published by the Free Software Foundation; either version 2
9			* of the License, or (at your option) any later version.
10			*
11			* WinPT is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14			* General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with WinPT; if not, write to the Free Software Foundation,
18			* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20
21			#include <windows.h>
22			#include <ctype.h>
23
24			#include "../resource.h"
25			#include "wptNLS.h"
26			#include "wptW32API.h"
27			#include "wptVersion.h"
28			#include "wptGPG.h"
29			#include "wptCommonCtl.h"
30			#include "wptContext.h"
31			#include "wptDlgs.h"
32			#include "wptUTF8.h"
33			#include "wptErrors.h"
34			#include "wptTypes.h"
35			#include "wptAgent.h"
36			#include "wptRegistry.h"
37
38
39			#define item_ctrl_id( cmd ) \
40			((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
41
42	twoaday	22	#define item_ctrl_id2(cmd) \
43			((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
44	twoaday	2
45	twoaday	22
46	twoaday	2	BOOL CALLBACK
47	twoaday	4	passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
48	twoaday	2	{
49			static passphrase_cb_s * c;
50			gpgme_key_t key;
51			const char * s, * id;
52			char info[768] = {0};
53			void * ctx = NULL, * item;
54			unsigned int pkalgo;
55
56			switch( msg ) {
57			case WM_INITDIALOG:
58			c = (passphrase_cb_s *)lparam;
59	twoaday	4	if (!c)
60			BUG (0);
61			SetWindowText (dlg, c->title);
62			if (c->gpg_cmd == GPG_CMD_DECRYPT) {
63	twoaday	2	SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,
64			_("Encrypted with the following public key(s)") );
65			CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );
66			}
67			else if( c->gpg_cmd == GPG_CMD_SIGN )
68			CheckDlgButton( dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED );
69			if( c->enc_to && c->gpg_cmd == GPG_CMD_DECRYPT ) {
70			gpgme_recipients_enum_open( c->enc_to, &ctx );
71			while ( (s = gpgme_recipients_enum_read( c->enc_to, &ctx )) ) {
72			pkalgo = *s; s++;
73			get_pubkey( s, &key );
74			if( key ) {
75			char * uid = NULL;
76			id = gpgme_key_get_string_attr( key, GPGME_ATTR_USERID, NULL, 0 );
77			if( !id )
78			id = _("Invalid User ID");
79			uid = utf8_to_wincp (id, strlen (id));
80			_snprintf( info, sizeof info - 1, "%s (%s, 0x%s)", uid,
81			gpgme_key_expand_attr( GPGME_ATTR_ALGO, pkalgo ), s+8 );
82			free( uid );
83			}
84			else
85			_snprintf( info, sizeof info - 1, _("Unknown (key ID 0x%s)"),
86			s? s + 8 : "DEADBEEF" );
87			listbox_add_string( GetDlgItem( dlg, IDC_DECRYPT_LIST ), info );
88			}
89			gpgme_recipients_enum_close( c->enc_to, &ctx );
90			}
91			SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
92			IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
93			_("Please enter your passphrase") );
94			if( c->gpg_cmd == GPG_CMD_DECRYPT ) {
95			SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );
96			SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );
97			}
98			else {
99			SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );
100			SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );
101			}
102			center_window( dlg );
103			SetForegroundWindow( dlg );
104			set_active_window( dlg );
105			return FALSE;
106
107			case WM_SYSCOMMAND:
108			if( LOWORD( wparam ) == SC_CLOSE ) {
109			SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );
110			c->cancel = 1;
111			EndDialog( dlg, TRUE );
112			}
113			return FALSE;
114
115			case WM_COMMAND:
116			switch( HIWORD( wparam ) ) {
117			case BN_CLICKED:
118			if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE
119			\|\| LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {
120			HWND hwnd;
121	twoaday	22	int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
122			hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
123	twoaday	4	SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );
124	twoaday	22	SetFocus (hwnd);
125	twoaday	2	}
126			}
127
128	twoaday	4	switch (LOWORD (wparam)) {
129			case IDOK:
130	twoaday	2	/* fixme: the item is even cached when the passphrase is not
131			correct, which means that the user needs to delete all
132			cached entries to continue. */
133	twoaday	4	GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, sizeof (c->pwd) -1);
134			if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) {
135			if (agent_get_cache (c->keyid, &item))
136			agent_unlock_cache_entry (&item);
137	twoaday	2	else
138	twoaday	4	agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
139	twoaday	2	}
140	twoaday	4	EndDialog (dlg, TRUE);
141	twoaday	2	return TRUE;
142
143			case IDCANCEL:
144	twoaday	4	SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );
145	twoaday	2	c->cancel = 1;
146	twoaday	4	EndDialog (dlg, FALSE);
147	twoaday	2	return FALSE;
148			}
149			break;
150			}
151
152			return FALSE;
153			} /* passphrase_callback_proc */
154
155
156			static const char *
157	twoaday	22	parse_gpg_keyid (const char * desc)
158	twoaday	2	{
159			static char keyid[16+1];
160			char * p;
161
162	twoaday	22	p = strrchr (desc, '\n');
163	twoaday	2	if( !p )
164			return NULL;
165			/* the format of the desc buffer looks like this:
166			request_keyid[16] main_keyid[16] keytype[1] keylength[4]
167			we use the main keyid to use only one cache entry. */
168	twoaday	22	strncpy (keyid, desc+(p-desc+1+17), 16);
169	twoaday	2	return keyid;
170			} /* parse_gpg_keyid */
171
172
173			static void
174			parse_gpg_description( char * desc, int size )
175			{
176			char * buffer = NULL, ch, uid[128] = {0}, * uid2 = NULL;
177			char usedkey[16+1] = {0}, mainkey[16+1] = {0};
178			const char * buf;
179			int i, algo, try_again = 0;
180
181			if( stristr( desc, "[User ID hint missing]" )
182			\|\| stristr( desc, "[passphrase info missing]" ) ) {
183			_snprintf( desc, size-1,
184			_("You need a passphrase to unlock the secret key for\n"
185			"user: [UserID hint missing]\n"
186			" [passphrase info missing]\n") );
187			return;
188			}
189
190			buffer = new char[size+1];
191			if( !buffer )
192			BUG( NULL );
193			strcpy( buffer, desc );
194			buf = buffer;
195			if( strstr( buf, "TRY_AGAIN" ) ) {
196			buf += strlen( "TRY_AGAIN\n" );
197			try_again = 1;
198			}
199			else if( strstr( buf, "ENTER_PASSPHRASE" ) )
200			buf += strlen( "ENTER_PASSPHRASE\n" );
201			else
202			BUG( NULL );
203			buf += 17;
204			for( i = 0; i < sizeof uid-1; i++ ) {
205			ch = *buf++;
206			if( ch == '\n' ) {
207			uid[i] = '\0';
208			break;
209			}
210			uid[i] = ch;
211			}
212			memcpy( usedkey, buf, 16 );
213			usedkey[16] = '\0';
214			buf += 17;
215			memcpy( mainkey, buf, 16 );
216			mainkey[16] = '\0';
217			buf += 17;
218			if( !buf )
219			BUG( NULL );
220			algo = atol( buf );
221			free_if_alloc( buffer );
222
223			uid2 = utf8_to_wincp (uid, strlen (uid));
224
225			if( strcmp( usedkey, mainkey ) )
226			_snprintf( desc, size-1,
227			_("You need a passphrase to unlock the secret key for\n"
228			"user: \"%s\"\n"
229			"%s key, ID %s (main key ID %s)\n"),
230			uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),
231			usedkey+8, mainkey+8 );
232			else if( !strcmp( usedkey, mainkey ) )
233			_snprintf( desc, size-1,
234			_("You need a passphrase to unlock the secret key for\n"
235			"user: \"%s\"\n"
236			"%s key, ID %s\n"),
237			uid2, gpgme_key_expand_attr( GPGME_ATTR_ALGO, algo ),
238			usedkey+8 );
239			free( uid2 );
240			} /* parse_gpg_describtion */
241
242
243			static int inline
244			is_hexstring( const char * p )
245			{
246			size_t i;
247			for( i=0; i < strlen( p ); i++ ) {
248			if( !isxdigit( p[i] ) )
249			return -1;
250			}
251			return 0;
252			}
253
254
255			const char *
256			passphrase_cb( void * opaque, const char * desc, void * r_hd )
257			{
258			passphrase_cb_s * c = (passphrase_cb_s *)opaque;
259			void * item;
260			const char * pass, * keyid;
261			int rc = 0;
262
263			if( !c )
264			return NULL;
265
266			if( desc ) {
267	twoaday	22	keyid = parse_gpg_keyid (desc);
268	twoaday	2	pass = agent_get_cache( keyid, &item );
269			if( pass ) {
270			agent_unlock_cache_entry( &item );
271			c->pwd_init = 0;
272			return pass;
273			}
274			}
275
276			if( c->pwd_init ) {
277			c->keyid = keyid;
278			/* if the desc has a length of 32 and only hex digits, we assume a
279			smart card has been used. */
280			/log_box( "", 0, "%s %d %d", desc,strlen( desc), is_hexstring( desc ) );/
281			if( desc && strlen( desc ) == 32 && !is_hexstring( desc ) ) {
282			char buf[16];
283			memset( buf, 0, sizeof buf );
284			strncpy( buf, desc+20, 8 );
285			_snprintf( c->info, sizeof c->info-1,
286			_("Please enter the PIN to unlock your secret card key\n"
287			"Card: %s"), buf );
288			c->is_card = 1;
289			}
290	twoaday	22	else if(desc) {
291			strcpy (c->info, desc);
292			parse_gpg_description (c->info, sizeof c->info - 1);
293	twoaday	2	}
294			if( c->gpg_cmd == GPG_CMD_DECRYPT ) {
295			rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
296			(HWND)c->hwnd, passphrase_callback_proc,
297			(LPARAM)c );
298			}
299			else if( c->gpg_cmd == GPG_CMD_SIGN ) {
300			rc = DialogBoxParam( glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
301			(HWND)c->hwnd, passphrase_callback_proc,
302			(LPARAM)c );
303			}
304			if( rc == -1 )
305			return NULL;
306			c->pwd_init = 0;
307			}
308
309			if( c->cancel )
310			return NULL;
311
312			return c->pwd;
313			} /* passphrase_cb */
314
315
316			void
317	twoaday	22	set_gpg_passphrase_cb (gpgme_ctx_t c, passphrase_cb_s *ctx, int cmd,
318			HWND hwnd, const char *title)
319	twoaday	2	{
320			ctx->gpg_cmd = cmd;
321			ctx->is_card = 0;
322			ctx->cancel = 0;
323			ctx->hwnd = hwnd;
324			ctx->pwd_init = 1;
325	twoaday	22	if (strlen (title) > 256)
326			BUG (NULL); /* check bounds */
327			strcpy (ctx->title, title);
328			gpgme_set_passphrase_cb (c, passphrase_cb, ctx);
329	twoaday	2	} /* set_gpg_passphrase_cb */
330	twoaday	22
331
332			int
333			check_passwd_quality (const char *pass, int strict)
334			{
335			int i, nd=0, nc=0, n;
336
337			n = strlen (pass);
338			if (n < 8)
339			return -1;
340
341			for (i=0; i < n; i++) {
342			if (isdigit (pass[i])) nd++;
343			if (isalpha (pass[i])) nc++;
344			}
345
346			if (nd == n \|\| nc == n)
347			return -1;
348
349			return 0;
350			}