如何重置 iPhone 應用程序的鑰匙串？

Question

我想知道是否有辦法重置我的應用程序的鑰匙串。 我想知道鑰匙串是否存在[NSUserDefaults resetStandardUserDefaults]類的東西。 即使刪除應用程序后，鑰匙串也不會重置。 到目前為止，我知道的唯一方法是從應用程序中一一重置它們。

Answer 1

由於到目前為止所有答案都依賴於您知道要刪除的標識符，因此我想提交以下解決方案，刪除應用程序的所有現有密鑰（僅限 iOS）

目標-C：

-(void)resetKeychain {
    [self deleteAllKeysForSecClass:kSecClassGenericPassword];
    [self deleteAllKeysForSecClass:kSecClassInternetPassword];
    [self deleteAllKeysForSecClass:kSecClassCertificate];
    [self deleteAllKeysForSecClass:kSecClassKey];
    [self deleteAllKeysForSecClass:kSecClassIdentity];
}

-(void)deleteAllKeysForSecClass:(CFTypeRef)secClass {
    NSMutableDictionary* dict = [NSMutableDictionary dictionary];
    [dict setObject:(__bridge id)secClass forKey:(__bridge id)kSecClass];
    OSStatus result = SecItemDelete((__bridge CFDictionaryRef) dict);
    NSAssert(result == noErr || result == errSecItemNotFound, @"Error deleting keychain data (%ld)", result);
}

斯威夫特 2.2：

func resetKeychain() {
    self.deleteAllKeysForSecClass(kSecClassGenericPassword)
    self.deleteAllKeysForSecClass(kSecClassInternetPassword)
    self.deleteAllKeysForSecClass(kSecClassCertificate)
    self.deleteAllKeysForSecClass(kSecClassKey)
    self.deleteAllKeysForSecClass(kSecClassIdentity)
}

func deleteAllKeysForSecClass(secClass: CFTypeRef) {
    let dict: [NSString : AnyObject] = [kSecClass : secClass]
    let result = SecItemDelete(dict)
    assert(result == noErr || result == errSecItemNotFound, "Error deleting keychain data (\(result))")
}

斯威夫特 3：

func resetKeychain() {
    deleteAllKeysForSecClass(kSecClassGenericPassword)
    deleteAllKeysForSecClass(kSecClassInternetPassword)
    deleteAllKeysForSecClass(kSecClassCertificate)
    deleteAllKeysForSecClass(kSecClassKey)
    deleteAllKeysForSecClass(kSecClassIdentity)
}

func deleteAllKeysForSecClass(_ secClass: CFTypeRef) {
    let dict: [NSString : Any] = [kSecClass : secClass]
    let result = SecItemDelete(dict as CFDictionary)
    assert(result == noErr || result == errSecItemNotFound, "Error deleting keychain data (\(result))")
}

Answer 2

KeychainItemWrapper *keychainItem = [[KeychainItemWrapper alloc] initWithIdentifier:@"nameOfYourKeychain" accessGroup:nil];

[keychainItem resetKeychainItem];

簡單得多:)

編輯：回應下面提出的一個問題 - KeychainItemWrapper 是什么？

這是 Apple 編寫的類，您可以在此處下載： http : //developer.apple.com/library/ios/#samplecode/GenericKeychain/Listings/Classes_KeychainItemWrapper_m.html

將其添加到您的項目中，然后將其導入到您想要使用的位置。 然后使用我上面提供的代碼片段。

Answer 3

Vegard 解決方案的基於塊的版本：

void (^deleteAllKeysForSecClass)(CFTypeRef) = ^(CFTypeRef secClass) {
    id dict = @{(__bridge id)kSecClass: (__bridge id)secClass};
    OSStatus result = SecItemDelete((__bridge CFDictionaryRef) dict);
    NSAssert(result == noErr || result == errSecItemNotFound, @"Error deleting keychain data (%d)", (int)result);
};
deleteAllKeysForSecClass(kSecClassGenericPassword);
deleteAllKeysForSecClass(kSecClassInternetPassword);
deleteAllKeysForSecClass(kSecClassCertificate);
deleteAllKeysForSecClass(kSecClassKey);
deleteAllKeysForSecClass(kSecClassIdentity);

對於我們這些喜歡直接插入代碼而不必使用輔助方法的人。

Answer 4

- (void)resetKeychainItem
{
    OSStatus junk = noErr;
    if (!keychainItemData) {
        self.keychainItemData = [[NSMutableDictionary alloc] init];
    } else if (keychainItemData){
        NSMutableDictionary *tempDictionary = [self dictionaryToSecItemFormat:keychainItemData];
        junk = SecItemDelete((CFDictionaryRef)tempDictionary);
        if ( junk != noErr ) {
            UIAlertView *dialog = [[UIAlertView alloc] initWithTitle:@"Keychain Error" message:[NSString stringWithFormat:@"A problem with updating the secure Keychain items with this information (likely, this email address information is duplicated in another Player).  Error code: %d %@", junk, [self resultText:-junk]] delegate:self cancelButtonTitle:NSLocalizedStringFromTable(@"Ok", @"Localizable", @"display text") otherButtonTitles:nil];
            [dialog show];
            [dialog release];
            //NSAssert( junk == noErr || junk == errSecItemNotFound, @"Problem deleting current dictionary." );
            return;
        }
    }

    // Default attributes for keychain item.
    [keychainItemData setObject:@"" forKey:(id)kSecAttrAccount];
    [keychainItemData setObject:@"" forKey:(id)kSecValueData];
    [keychainItemData setObject:@"" forKey:(id)kSecAttrLabel];
    [keychainItemData setObject:@"" forKey:(id)kSecAttrDescription];
    [keychainItemData setObject:@"" forKey:(id)kSecAttrComment];
    // Default data for keychain item.
    [keychainItemData setObject:@"" forKey:(id)kSecAttrModificationDate];
    [keychainItemData setObject:@"" forKey:(id)kSecAttrService];


}