when wrong GPG passphrase is entered, we re-ask to user twice. Fixes [1410]

src/common/connection.py

@@ -1916,6 +1916,13 @@ class Connection:
 			#Inform GUI we just signed in
 			self.dispatch('SIGNED_IN', ())
 
+	def test_gpg_passphrase(self, password):
+		self.gpg.passphrase = password
+		keyID = gajim.config.get_per('accounts', self.name, 'keyid')
+		signed = self.gpg.sign('test', keyID)
+		self.gpg.password = None
+		return signed != 'BAD_PASSPHRASE'
+
 	def get_signed_msg(self, msg):
 		signed = ''
 		keyID = gajim.config.get_per('accounts', self.name, 'keyid')

src/roster_window.py

@@ -1518,14 +1518,25 @@ _('If "%s" accepts this request you will know his or her status.') % jid)
 							passphrase = self.gpg_passphrase[keyid]
 							save = False
 						else:
-							w = dialogs.PassphraseDialog(
-								_('Passphrase Required'),
-								_('Enter GPG key passphrase for account %s') % account,
+							password_ok = False
+							count = 0
+							title = _('Passphrase Required')
+							second = _('Enter GPG key passphrase for account %s.') % \
+								account
+							while not password_ok and count < 3:
+								count += 1
+								w = dialogs.PassphraseDialog(title, second,
 									_('Save passphrase'))
 								passphrase, save = w.run()
 								if passphrase == -1:
 									passphrase = None
+									password_ok = True
 								else:
+									password_ok = gajim.connections[account].\
+										test_gpg_passphrase(passphrase)
+									title = _('Wrong Passphrase')
+									second = _('Please retype your GPG passphrase or press Cancel.')
+							if passphrase != None:
 								self.gpg_passphrase[keyid] = passphrase
 								gobject.timeout_add(30000, self.forget_gpg_passphrase, keyid)
 						if save: